ISSN 
2003 Vol. 32, No. 6
2003, 32(6): 593-597.
Abstract:
"Blind speed" phenomenon due to Doppler frequency usually exists in moving target indication radar. This disadvantage affect is avoided through staggered pulse repetition frequency method. In wideband radar, a noncoherent moving target indication method is adopted, which is used to detect the moving target through instantaneous displacement of radar echo signals. It not only can completely avoid the affect of "blind speed" and simplifies system design, but also can effectively detect the targets of different speed including low speed. In this paper, these two clutter suppression methods are researched, and the corresponding results of analysis are finally presented.
"Blind speed" phenomenon due to Doppler frequency usually exists in moving target indication radar. This disadvantage affect is avoided through staggered pulse repetition frequency method. In wideband radar, a noncoherent moving target indication method is adopted, which is used to detect the moving target through instantaneous displacement of radar echo signals. It not only can completely avoid the affect of "blind speed" and simplifies system design, but also can effectively detect the targets of different speed including low speed. In this paper, these two clutter suppression methods are researched, and the corresponding results of analysis are finally presented.
2003, 32(6): 598-603.
Abstract:
By the mobile communication developing, location technology became new service of hotspot. More and more research organization have paid attention to this technology and it is necessary that mobile proprietor must provide location service before 2001 years. This paper it introduce all kinds of cell location techniques, advantage and disadvantage of every method is also said. In the end it point out the problems that have to be researched in the future and the trend of this technology.
By the mobile communication developing, location technology became new service of hotspot. More and more research organization have paid attention to this technology and it is necessary that mobile proprietor must provide location service before 2001 years. This paper it introduce all kinds of cell location techniques, advantage and disadvantage of every method is also said. In the end it point out the problems that have to be researched in the future and the trend of this technology.
2003, 32(6): 604-607.
Abstract:
In this paper, UWB technology for high speed wireless transmission in indoor environment is introduced, and then the performance is analyzed and compared when it is applied to high-speed wireless transmission in indoor environments, including shape of impulse, modulation methods, multi-access technology, characterization of UWB channel in indoor environments, and structure of UWB communication system for time-hoping pulse position modulation(TH-PPM) method. at last, it concludes that the performance is good and realization is easy for UWB with pulse position modulation, gauss waveform and TH technology.
In this paper, UWB technology for high speed wireless transmission in indoor environment is introduced, and then the performance is analyzed and compared when it is applied to high-speed wireless transmission in indoor environments, including shape of impulse, modulation methods, multi-access technology, characterization of UWB channel in indoor environments, and structure of UWB communication system for time-hoping pulse position modulation(TH-PPM) method. at last, it concludes that the performance is good and realization is easy for UWB with pulse position modulation, gauss waveform and TH technology.
2003, 32(6): 608-611.
Abstract:
Receiver diversity for Orthogonal Frequency Division Multiplexing system in high-speed wireless data transmission is investigated. An improved channel estimate method that calculates the correlation of the channel impulse response and a reference signal to extract the channel information from its noisy version is proposed. It is demonstrated by theoretical analysis and computer simulation that for QPSK modulated OFDM systems with one transmitter antenna and four receiver antennas, the performance of the improved channel estimator outperforms Least Square and Discrete Fourier Transform-based channel estimator greatly.
Receiver diversity for Orthogonal Frequency Division Multiplexing system in high-speed wireless data transmission is investigated. An improved channel estimate method that calculates the correlation of the channel impulse response and a reference signal to extract the channel information from its noisy version is proposed. It is demonstrated by theoretical analysis and computer simulation that for QPSK modulated OFDM systems with one transmitter antenna and four receiver antennas, the performance of the improved channel estimator outperforms Least Square and Discrete Fourier Transform-based channel estimator greatly.
2003, 32(6): 612-615.
Abstract:
This paper proposes a new method of the wireless cellular location based on the time difference of arrival and the direction of arrival in the uplink of WCDMA system. The traditional method based on the hyperbola and the circle needs at least three base stations to get the location of the mobile station, but the new method gets the location of the mobile station by only two base stations, which reduces the complexion of the system. The new method is more accurate than the traditional method that only bases on the time difference of arrival. In addition, the performance of the proposed wireless cellular locating method is evaluated through simulations.
This paper proposes a new method of the wireless cellular location based on the time difference of arrival and the direction of arrival in the uplink of WCDMA system. The traditional method based on the hyperbola and the circle needs at least three base stations to get the location of the mobile station, but the new method gets the location of the mobile station by only two base stations, which reduces the complexion of the system. The new method is more accurate than the traditional method that only bases on the time difference of arrival. In addition, the performance of the proposed wireless cellular locating method is evaluated through simulations.
2003, 32(6): 616-619,617.
Abstract:
When cellular networks are utilized to locate the position of mobile station, in order to degrade the disadvantageous influence of non-line-of-sight propagation of radio waves on location performance, an improved location algorithm is proposed in this paper. In this algorithm the time difference of arrival and time of arrival measurements are firstly smoothed and reconstructed, then a two step weighted least square algorithm is employed to estimate the position of MS. Simulation shows that the location performance is significantly improved in non-line-of-sight propagation environment.
When cellular networks are utilized to locate the position of mobile station, in order to degrade the disadvantageous influence of non-line-of-sight propagation of radio waves on location performance, an improved location algorithm is proposed in this paper. In this algorithm the time difference of arrival and time of arrival measurements are firstly smoothed and reconstructed, then a two step weighted least square algorithm is employed to estimate the position of MS. Simulation shows that the location performance is significantly improved in non-line-of-sight propagation environment.
2003, 32(6): 620-623.
Abstract:
Using analytical method and numerical method, the paper emphatically researches propagation characteristics of electromagnetic waves in circular tunnel, rectangular tunnel and arched tunnel. A conclusion is made that the larger area of cross sections is, the lower attenuation rate is, and shape of cross sections affects on attenuation rate too. When frequency is comparatively high, circular tunnel, rectangular tunnel and arched tunnel have same formulation of attenuation rate. When the radius or half of larger side is ten times larger than the free-space wavelength, attenuation rate is very low and hardly related to the shape of cross sections, and only related slightly to the area of cross section of tunnel.
Using analytical method and numerical method, the paper emphatically researches propagation characteristics of electromagnetic waves in circular tunnel, rectangular tunnel and arched tunnel. A conclusion is made that the larger area of cross sections is, the lower attenuation rate is, and shape of cross sections affects on attenuation rate too. When frequency is comparatively high, circular tunnel, rectangular tunnel and arched tunnel have same formulation of attenuation rate. When the radius or half of larger side is ten times larger than the free-space wavelength, attenuation rate is very low and hardly related to the shape of cross sections, and only related slightly to the area of cross section of tunnel.
2003, 32(6): 624-627.
Abstract:
In this paper, Nanotubes films are grown by thermal chemical vapour deposition on silicon substrates with nickel as a catalyst particle. The SEM, TEM has been used in order to determine the structure of the films, which show that the diameters of nanotubes are 50~70 nm. characterization has been measured on the CNT-anode setup room temperature and in a vacuum chamber. The Fowler-Nordheim plot shows a good linear fit, indicating that the emission current only comes from the protruded nanotubes. Threshold field strength of this nanotubes film is about 8 V/mm for an emission current of 1 mA, and the most field emission current densities of more than 2 mA/cm2 are measured for 11 V/mm. In addition, the bright light spot can be observed, while emitted electron bombardment fluorescent screen.
In this paper, Nanotubes films are grown by thermal chemical vapour deposition on silicon substrates with nickel as a catalyst particle. The SEM, TEM has been used in order to determine the structure of the films, which show that the diameters of nanotubes are 50~70 nm. characterization has been measured on the CNT-anode setup room temperature and in a vacuum chamber. The Fowler-Nordheim plot shows a good linear fit, indicating that the emission current only comes from the protruded nanotubes. Threshold field strength of this nanotubes film is about 8 V/mm for an emission current of 1 mA, and the most field emission current densities of more than 2 mA/cm2 are measured for 11 V/mm. In addition, the bright light spot can be observed, while emitted electron bombardment fluorescent screen.
2003, 32(6): 628-631.
Abstract:
The forced oscillation of an electronic equipment is discussed, and the technology of a non-resonance dashpot is presented. The design method, which improves resistance to environment impact for the printed circuit and other parts of electronic equipment, is studied. Other methods, which include improving the stiffness of a mechanical construction, reducing local concentration of stress, and using the inverse-distortion for resistance to environment of gravitation, are also discussed. Those methods are helpful to design an electronic equipment.
The forced oscillation of an electronic equipment is discussed, and the technology of a non-resonance dashpot is presented. The design method, which improves resistance to environment impact for the printed circuit and other parts of electronic equipment, is studied. Other methods, which include improving the stiffness of a mechanical construction, reducing local concentration of stress, and using the inverse-distortion for resistance to environment of gravitation, are also discussed. Those methods are helpful to design an electronic equipment.
2003, 32(6): 632-634.
Abstract:
Take a model sewage treatment plant as an example, the mathematic model of sewage acid/alkali deviation is figured out oriented by combined oxidation ditches. The relationship between pH measuring value and acid/alkali deviation is built up by means of non-linear transformation. According to these results, the adaptive algorithm is given out for digital discharge valve control. The algorithm adopted Restricted Least Square Method to estimate the parameter θ0 and realized estimating on-line. The control system has been used in that model plant and the controlling results are proved good.
Take a model sewage treatment plant as an example, the mathematic model of sewage acid/alkali deviation is figured out oriented by combined oxidation ditches. The relationship between pH measuring value and acid/alkali deviation is built up by means of non-linear transformation. According to these results, the adaptive algorithm is given out for digital discharge valve control. The algorithm adopted Restricted Least Square Method to estimate the parameter θ0 and realized estimating on-line. The control system has been used in that model plant and the controlling results are proved good.
2003, 32(6): 635-637.
Abstract:
The analytic formulations are presented of the epicyclic motion of a spacecraft about the true anomaly and the eccentric anomaly. The eccentric anomaly as a function of time is calculated by the iterative method. And the iteration's convergence-condition is discussed. The relationship between the true anomaly and the time is gotten by the numerical integral method. The numerical simulation's results of this approach are presented.
The analytic formulations are presented of the epicyclic motion of a spacecraft about the true anomaly and the eccentric anomaly. The eccentric anomaly as a function of time is calculated by the iterative method. And the iteration's convergence-condition is discussed. The relationship between the true anomaly and the time is gotten by the numerical integral method. The numerical simulation's results of this approach are presented.
2003, 32(6): 638-640.
Abstract:
This paper introduces solar-powered water-saving irrigation device. It is indicated that we should regard study of water-saving irrigation. Abstract This paper introduces solar-powered water-saving irrigation device. It showed that the device was reliable and effective for a period lasting about half a year. Moreover, agricultural engineers acknowledged the device's value. The device also has now received two national patents. It can be used in water-saving irrigation for plant, and protect the virescence of the city.
This paper introduces solar-powered water-saving irrigation device. It is indicated that we should regard study of water-saving irrigation. Abstract This paper introduces solar-powered water-saving irrigation device. It showed that the device was reliable and effective for a period lasting about half a year. Moreover, agricultural engineers acknowledged the device's value. The device also has now received two national patents. It can be used in water-saving irrigation for plant, and protect the virescence of the city.
2003, 32(6): 641-644.
Abstract:
Enzymatic browning of different parts of banana fruits, as well as browning resulted from peeling, cutting, pounding and enzymatic passivation has been studied. Several color-protecting solutions have been obtained after filtrating through the experiments of browning inhibition. Results indicated that the husks, the threads on the pulp and the core of banana were more apt to brown than the pulp. The degrees of impacts of different mechanical treatments on enzymatic browning were in a descending order, as follows, pounding > cutting > peeling. The longer the time of pounding was, the more intense of browning. At color protection, the enzymatic passivation by microwave treatment was better than boiling water treatment and steam treatment, as well as at preserving banana flavor. Citric acid, erythoribic acid, 4-hexylresorcinol and phytic acid had color protection function on banana jam. The best recipe of them was citric acid 0.32%, erythoribic acid 0.06%, 4-hexylresorcinol 0.12% and phytic acid 0.02%.
Enzymatic browning of different parts of banana fruits, as well as browning resulted from peeling, cutting, pounding and enzymatic passivation has been studied. Several color-protecting solutions have been obtained after filtrating through the experiments of browning inhibition. Results indicated that the husks, the threads on the pulp and the core of banana were more apt to brown than the pulp. The degrees of impacts of different mechanical treatments on enzymatic browning were in a descending order, as follows, pounding > cutting > peeling. The longer the time of pounding was, the more intense of browning. At color protection, the enzymatic passivation by microwave treatment was better than boiling water treatment and steam treatment, as well as at preserving banana flavor. Citric acid, erythoribic acid, 4-hexylresorcinol and phytic acid had color protection function on banana jam. The best recipe of them was citric acid 0.32%, erythoribic acid 0.06%, 4-hexylresorcinol 0.12% and phytic acid 0.02%.
2003, 32(6): 645-648.
Abstract:
In this paper, a PID calculating method with the mode of increment and staged parameters regulation is provided for the Resistance Method for direct measuring and controlling carbon potential. It has been proved by practice that such a method has the advantages of little over control, short transient time, high accuracy and convenient software.
In this paper, a PID calculating method with the mode of increment and staged parameters regulation is provided for the Resistance Method for direct measuring and controlling carbon potential. It has been proved by practice that such a method has the advantages of little over control, short transient time, high accuracy and convenient software.
2003, 32(6): 649-651.
Abstract:
In this paper,2mm-gap and 3mm-gap lateral high resistive InP:Fe Photoconductive semiconductor switches are fabricated.These switches are triggered by nano-second and pico-second laser pulse. Experiment are given out and a fast time,narrow pulse duration and stable performance waveform is received.This experiment not only can be applied in Ultra-wideband signal's generation but also supplies important reference for the theory investigation.
In this paper,2mm-gap and 3mm-gap lateral high resistive InP:Fe Photoconductive semiconductor switches are fabricated.These switches are triggered by nano-second and pico-second laser pulse. Experiment are given out and a fast time,narrow pulse duration and stable performance waveform is received.This experiment not only can be applied in Ultra-wideband signal's generation but also supplies important reference for the theory investigation.
2003, 32(6): 652-654.
Abstract:
the study method of millimeter three-ports element oscillator stabilized with a dielectric resonator is presented. The original structure of loop-feedback is used. In the project (Ka-band HEMT oscillator), the integrated microstrip circuit is used, the high-electron-mobility-transistor microwave monolithic integrated circuit is applied and the cylindrical dielectric oscillator is used, not only as a frequency-stabilizing element, but also as a feedback circuit coupled to the O/I of the MMIC. The phasenoise and output power of the oscillator is measured.Experiment results is indicated that this method can be used in millimeter system.
the study method of millimeter three-ports element oscillator stabilized with a dielectric resonator is presented. The original structure of loop-feedback is used. In the project (Ka-band HEMT oscillator), the integrated microstrip circuit is used, the high-electron-mobility-transistor microwave monolithic integrated circuit is applied and the cylindrical dielectric oscillator is used, not only as a frequency-stabilizing element, but also as a feedback circuit coupled to the O/I of the MMIC. The phasenoise and output power of the oscillator is measured.Experiment results is indicated that this method can be used in millimeter system.
2003, 32(6): 655-660.
Abstract:
A Novel Switch-Linearity Hybrid power conversion technique is introduced. Experiments and simulations show that the proposed system can operate in audio switch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level. These are beneficial to human's health, extending the power devices' life, and also improving the quality of the processing matched to the motor's operation.
A Novel Switch-Linearity Hybrid power conversion technique is introduced. Experiments and simulations show that the proposed system can operate in audio switch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level. These are beneficial to human's health, extending the power devices' life, and also improving the quality of the processing matched to the motor's operation.
2003, 32(6): 661-664,668.
Abstract:
In this paper, the method and algorithm of multi-sensor decision-making level based on D-S evidence theory are researched in the light of basic theory knowledge of the multi-sensor information fusion, and the detailed formulations are reasoned without middle normalizing unity calculation with extending Dempster rule to multi-source information, which can reduce the calculation quantity. When this method is used to the nondestructive testing experiment that three kinds of sensors detects a casting, the result has proved this improved algorithm can improve detection precision and speed.
In this paper, the method and algorithm of multi-sensor decision-making level based on D-S evidence theory are researched in the light of basic theory knowledge of the multi-sensor information fusion, and the detailed formulations are reasoned without middle normalizing unity calculation with extending Dempster rule to multi-source information, which can reduce the calculation quantity. When this method is used to the nondestructive testing experiment that three kinds of sensors detects a casting, the result has proved this improved algorithm can improve detection precision and speed.
2003, 32(6): 665-668.
Abstract:
About interactive between moving charge, usually we try to get the Leena-wisheer potential first. At present paper, we educed the electromagnetic expression of moving charge by using the relativity transformation and calculated the interactive force between moving charge, then we got the electromagnetic momentum expression consisting in charge from the momentum expression consisting in field and discussed the relation between this interactive foce and electromagnetic momentum.
About interactive between moving charge, usually we try to get the Leena-wisheer potential first. At present paper, we educed the electromagnetic expression of moving charge by using the relativity transformation and calculated the interactive force between moving charge, then we got the electromagnetic momentum expression consisting in charge from the momentum expression consisting in field and discussed the relation between this interactive foce and electromagnetic momentum.
2003, 32(6): 669-672,678.
Abstract:
The development of embedded application is becoming more and more popular, and simulation development tool is a rapid, effective and low-cost tool for it. A software bus architecture named iBus has been researched and designed based on in-depth investigation of the use of Software Architecture. As a communication channel for the interconnection of system components, iBus is expected to be a firm infrastructure which is composed of bus core and bus adapter. The bus core embeds itself into main program, and then create bus adapters dynamically to connect system components. By this means, iBus can achieve system integration and the function of plug and play in software system. Based on iBus architecture, an integrated framework which is extensible and stable has been presented for efficient construction of the embedded system simulation development environment.
The development of embedded application is becoming more and more popular, and simulation development tool is a rapid, effective and low-cost tool for it. A software bus architecture named iBus has been researched and designed based on in-depth investigation of the use of Software Architecture. As a communication channel for the interconnection of system components, iBus is expected to be a firm infrastructure which is composed of bus core and bus adapter. The bus core embeds itself into main program, and then create bus adapters dynamically to connect system components. By this means, iBus can achieve system integration and the function of plug and play in software system. Based on iBus architecture, an integrated framework which is extensible and stable has been presented for efficient construction of the embedded system simulation development environment.
2003, 32(6): 673-678.
Abstract:
A new wavelet multi-resolution watermarking algorithm for images based on human visual model is presented. This scheme makes good use of the advantage of wavelet multi-resolution and the feature of human visual system, thus keeping the watermarks invisible and robust. Also, this algorithm need not original image and is only relevant to some detail sub-images during detection. The experimental results have shown that the digital watermarks, which are inserted in host image by the proposed algorithm, is robust for median filtering, salt-and-pepper noise and JPEG compression.
A new wavelet multi-resolution watermarking algorithm for images based on human visual model is presented. This scheme makes good use of the advantage of wavelet multi-resolution and the feature of human visual system, thus keeping the watermarks invisible and robust. Also, this algorithm need not original image and is only relevant to some detail sub-images during detection. The experimental results have shown that the digital watermarks, which are inserted in host image by the proposed algorithm, is robust for median filtering, salt-and-pepper noise and JPEG compression.
2003, 32(6): 679-682.
Abstract:
This paper introduces the model discursion-based intrusion detection system and the model-based intrusion detection system and presents a new kind of IDS based on agent, by which IDS distributes data and task to the nodes in the networks. Thus IDS can make best use of compute capability and resources of the networks, which covers the shortage of conventional centralized intrusion detection approach. Importantly, the genetic algorithm applied to the IDS is introduced in detail. In allusion to the apriori knowledge of system security always embodying as the selection of the useful subset of attributes in original data, this IDS uses the genetic algorithms to optimize the feature subset selection and to find the relative optimal subset of attributes expressed by feature vector. The IDS uses data mining algorithms to abstract key features of system runtime status from security audit data, and it uses genetic algorithm to select the feature subset to reduce the amount of data that must be obtained from running processes and classified.
This paper introduces the model discursion-based intrusion detection system and the model-based intrusion detection system and presents a new kind of IDS based on agent, by which IDS distributes data and task to the nodes in the networks. Thus IDS can make best use of compute capability and resources of the networks, which covers the shortage of conventional centralized intrusion detection approach. Importantly, the genetic algorithm applied to the IDS is introduced in detail. In allusion to the apriori knowledge of system security always embodying as the selection of the useful subset of attributes in original data, this IDS uses the genetic algorithms to optimize the feature subset selection and to find the relative optimal subset of attributes expressed by feature vector. The IDS uses data mining algorithms to abstract key features of system runtime status from security audit data, and it uses genetic algorithm to select the feature subset to reduce the amount of data that must be obtained from running processes and classified.
2003, 32(6): 683-686.
Abstract:
In this paper, the intrusion detection systems nowadays are analyzed, and a framework of intrusion detection system based on mobile agents is proposed. How to implement mobile agents are as well as how to ensure the security of the mobile agents and whose running environment is studied. This framework will be significant for building an effective intrusion detection system.
In this paper, the intrusion detection systems nowadays are analyzed, and a framework of intrusion detection system based on mobile agents is proposed. How to implement mobile agents are as well as how to ensure the security of the mobile agents and whose running environment is studied. This framework will be significant for building an effective intrusion detection system.
2003, 32(6): 687-691.
Abstract:
The storage management overload and read-write performance of traditional disk queue are analyzed. To solve the problem that disk queue I/O is the primary performance bottleneck in messaging server, an efficient disk queue I/O mechanism called FlashQ is proposed. FlashQ utilizes pre-assigned continuous disk blocks to act as disk queue and organizes data in compact layout and adopts the Lazy Write and the Ahead Read polices to elevate the performance of read-write. Experiment shows that performance of the FlashQ is much better than that of traditional disk queue.
The storage management overload and read-write performance of traditional disk queue are analyzed. To solve the problem that disk queue I/O is the primary performance bottleneck in messaging server, an efficient disk queue I/O mechanism called FlashQ is proposed. FlashQ utilizes pre-assigned continuous disk blocks to act as disk queue and organizes data in compact layout and adopts the Lazy Write and the Ahead Read polices to elevate the performance of read-write. Experiment shows that performance of the FlashQ is much better than that of traditional disk queue.
2003, 32(6): 692-695,721.
Abstract:
To overcome the shortcoming of single-key-lock-pair access control scheme at present, a new single-key-lock-pair access control scheme is proposed, based on the property that a integer can be denoted into only one binary digital. All the single-key-lock-pair access control scheme are threaten by overflow problem. Besides that, under old scheme, user can own several kinds of right on one file only based on the supposition that the access rights is increase by degrees. With perfect dynamic feature, the new scheme is simply realized. Under new access control scheme, user can own several kinds of access right upon one file under the new scheme without the supposition that the access rights is increase by degrees, and the possibility of overflow problem is significantly reduced by our new method.
To overcome the shortcoming of single-key-lock-pair access control scheme at present, a new single-key-lock-pair access control scheme is proposed, based on the property that a integer can be denoted into only one binary digital. All the single-key-lock-pair access control scheme are threaten by overflow problem. Besides that, under old scheme, user can own several kinds of right on one file only based on the supposition that the access rights is increase by degrees. With perfect dynamic feature, the new scheme is simply realized. Under new access control scheme, user can own several kinds of access right upon one file under the new scheme without the supposition that the access rights is increase by degrees, and the possibility of overflow problem is significantly reduced by our new method.
2003, 32(6): 696-700.
Abstract:
This thesis proposes and discusses a new internal sorting algorithm, which combines mathematics extremum principle with data sorting algorithm. The algorithm expands the concept of minimum, establishes minimum extremum record index and can search very fast record from sequences through indexes of extremum record. As compared with the traditional internal sorting algorithms, the time complexity T(n) of the algorithm is O(n log n) at the most and it's space complexity is O(n). The algorithm guarantees the stability of data sorting while improves the efficiency of sorting.
This thesis proposes and discusses a new internal sorting algorithm, which combines mathematics extremum principle with data sorting algorithm. The algorithm expands the concept of minimum, establishes minimum extremum record index and can search very fast record from sequences through indexes of extremum record. As compared with the traditional internal sorting algorithms, the time complexity T(n) of the algorithm is O(n log n) at the most and it's space complexity is O(n). The algorithm guarantees the stability of data sorting while improves the efficiency of sorting.
2003, 32(6): 701-705.
Abstract:
The opening of Internet offers great convenience of information sharing and exchange, accompanied with crucial challenges to network security. Security issues have evolved into the key problem of information times. SYN flood is one of deny of service attacks through sending a lot of SYN packets. Through computing probabilities of received SYN packets and comparing with normal threshold, system finds out the SYN intrusion and writes it into alert log file.
The opening of Internet offers great convenience of information sharing and exchange, accompanied with crucial challenges to network security. Security issues have evolved into the key problem of information times. SYN flood is one of deny of service attacks through sending a lot of SYN packets. Through computing probabilities of received SYN packets and comparing with normal threshold, system finds out the SYN intrusion and writes it into alert log file.
2003, 32(6): 706-710.
Abstract:
This paper is concernede with the stockpile stratagem of commodities with deterioration for a class of store systems. By means of establishing a inventory model, the optimal stockpile stratagem is obtained for this store systems. This result is an extension for classical PLS model. Under the assumption that the articles possess accelerating deterioraling properties, the demanding rate is known, this paper get the best stockpile stratagems on the condition that the system don't pemit to runout of stock, or the system permit to runout of stock but don't postpone the time.
This paper is concernede with the stockpile stratagem of commodities with deterioration for a class of store systems. By means of establishing a inventory model, the optimal stockpile stratagem is obtained for this store systems. This result is an extension for classical PLS model. Under the assumption that the articles possess accelerating deterioraling properties, the demanding rate is known, this paper get the best stockpile stratagems on the condition that the system don't pemit to runout of stock, or the system permit to runout of stock but don't postpone the time.
2003, 32(6): 711-713.
Abstract:
The security defect of Web page design on building website is discussed in this paper, server-side dynamic Web page exists security defect are presented. Introducing the landing check lack-hole, and around checking the direct entering design page hole, and the table date-base loaded hole, and the source code expose hole and file up hole, and giving corresponding solving way.
The security defect of Web page design on building website is discussed in this paper, server-side dynamic Web page exists security defect are presented. Introducing the landing check lack-hole, and around checking the direct entering design page hole, and the table date-base loaded hole, and the source code expose hole and file up hole, and giving corresponding solving way.
2003, 32(6): 714-717.
Abstract:
In order to utilize a test mechanism that is impartial and where cheating is not allowed, we use Microsoft Visual Foxpro 6.0 to randomly select and arrange seats and place for the test after inputting the students' test data, ranking, seating layout, etc. Special emphasis is given to the thought and method of randomly arranging seats for students who fail a test as well as the advantage and disadvantages of the system. This program has been proved to be effective by pratical applications.
In order to utilize a test mechanism that is impartial and where cheating is not allowed, we use Microsoft Visual Foxpro 6.0 to randomly select and arrange seats and place for the test after inputting the students' test data, ranking, seating layout, etc. Special emphasis is given to the thought and method of randomly arranging seats for students who fail a test as well as the advantage and disadvantages of the system. This program has been proved to be effective by pratical applications.
2003, 32(6): 718-721.
Abstract:
To the single-chip microcomputer that used for the production field is general with were tested the object distance farther, easily suffer the assault of every kind of interference。this will require the single-chip microcomputer system to have very high and dependable, make it can resist the assault of every kind of interference.Therefore, anti-interference design is the applied system importantly constitute part.This is according to the circumstance of the actual production field, to discussed the inner part of the apply system with the exterior's interference source、analog channel's interference and solution、switch channel's interference and solution;the power system's interference and solution.And to because the interference result in of" die machine" appearance bring upped soft solution scheme.
To the single-chip microcomputer that used for the production field is general with were tested the object distance farther, easily suffer the assault of every kind of interference。this will require the single-chip microcomputer system to have very high and dependable, make it can resist the assault of every kind of interference.Therefore, anti-interference design is the applied system importantly constitute part.This is according to the circumstance of the actual production field, to discussed the inner part of the apply system with the exterior's interference source、analog channel's interference and solution、switch channel's interference and solution;the power system's interference and solution.And to because the interference result in of" die machine" appearance bring upped soft solution scheme.
2003, 32(6): 722-724.
Abstract:
In the process of construction of multi-media classroom, many schools dangle after the construction of hardware equipments inappropriately. This paper puts forward the appropriate design and construction scheme through studying the design fundamental and functional index of the multi-media classroom.
In the process of construction of multi-media classroom, many schools dangle after the construction of hardware equipments inappropriately. This paper puts forward the appropriate design and construction scheme through studying the design fundamental and functional index of the multi-media classroom.
2003, 32(6): 725-728.
Abstract:
Hidden Markov Model(HMM) is a widely used statistical model.This paper deal with the design of a recognition system for facial expression in the light of the principal theory and algorithm of the HMM.The system consists of two levels of HMM,with the low level composed of six HMM,corresponding to six expression-specific.The vectors of the facial expression features,after put into the system,is primarily identified through the low HMMsand result in the observation vectors of the high level of the HMM.Through deciphering of the HMM,the expression are identified,thus enhancing the recognition rate and strengthening the system to a higher level.
Hidden Markov Model(HMM) is a widely used statistical model.This paper deal with the design of a recognition system for facial expression in the light of the principal theory and algorithm of the HMM.The system consists of two levels of HMM,with the low level composed of six HMM,corresponding to six expression-specific.The vectors of the facial expression features,after put into the system,is primarily identified through the low HMMsand result in the observation vectors of the high level of the HMM.Through deciphering of the HMM,the expression are identified,thus enhancing the recognition rate and strengthening the system to a higher level.
2003, 32(6): 729-731.
Abstract:
Using ab initio method of GAMESS program, we calculate and analyse the changes of molecular geometry and electron structure of cholesterol molecule in the cell membrane under the high electric field,and compare the results with those under the E=0. The results illustrate that molecular geometry becomes somewhat different,but electron structures change a little. These results provide strong supports for the microscopic theoretical study of bio-molecule under the inherent high electric field(produced by resting potential) of the cell membrane.
Using ab initio method of GAMESS program, we calculate and analyse the changes of molecular geometry and electron structure of cholesterol molecule in the cell membrane under the high electric field,and compare the results with those under the E=0. The results illustrate that molecular geometry becomes somewhat different,but electron structures change a little. These results provide strong supports for the microscopic theoretical study of bio-molecule under the inherent high electric field(produced by resting potential) of the cell membrane.
2003, 32(6): 732-734,748.
Abstract:
Fluorinated MCM-41 (F/MCM-41) of various fluorine content was prepared and characterized by XRD and FT-IR. XRD patterns show that fluorine content is less than 5%, the phase of samples was unchanged. However, the phase of MCM-41 was broke with 10% of fluorine content, and grew up new phases (AlF2OH and AlF3). IR spectra of Pyridine adsorbed have been used to measure the acidities of F/MCM-41. It has been found that the acidities of F/MCM-41 was changed. When the fluorine content increases, Lewis acid sites decreases. Bronsted acid sites presents a maximum with 3% of fluorine content. Selectivity was studied by alkylation of toluene for the probe. Catalytic properties of F/MCM-41 for the alkylation of toluene with isopropanol were investigated. F/MCM-41 shows a high papa-isopropyltoluene selectivity when 3% of fluorine content. Reactive temperature 473 K and WHSV=0.85 h-1 were optimum.
Fluorinated MCM-41 (F/MCM-41) of various fluorine content was prepared and characterized by XRD and FT-IR. XRD patterns show that fluorine content is less than 5%, the phase of samples was unchanged. However, the phase of MCM-41 was broke with 10% of fluorine content, and grew up new phases (AlF2OH and AlF3). IR spectra of Pyridine adsorbed have been used to measure the acidities of F/MCM-41. It has been found that the acidities of F/MCM-41 was changed. When the fluorine content increases, Lewis acid sites decreases. Bronsted acid sites presents a maximum with 3% of fluorine content. Selectivity was studied by alkylation of toluene for the probe. Catalytic properties of F/MCM-41 for the alkylation of toluene with isopropanol were investigated. F/MCM-41 shows a high papa-isopropyltoluene selectivity when 3% of fluorine content. Reactive temperature 473 K and WHSV=0.85 h-1 were optimum.
2003, 32(6): 735-740.
Abstract:
A new slow-release fertilizer was developed by laboratory and cultivated trials. Selected by the soluble rate of the treatments designed by orthogonalty design, its components include urea formaldehyde(N source), CaHPO4 (P source), methyl cellulose(adhesive), K, Mg, S and all microelements. It was tested that its efficiency is long than 14 months, and 7.5 g of it per kilogram soil (in particles) is more suitable than other treatments. It is profitable for gardening of saving time from management.
A new slow-release fertilizer was developed by laboratory and cultivated trials. Selected by the soluble rate of the treatments designed by orthogonalty design, its components include urea formaldehyde(N source), CaHPO4 (P source), methyl cellulose(adhesive), K, Mg, S and all microelements. It was tested that its efficiency is long than 14 months, and 7.5 g of it per kilogram soil (in particles) is more suitable than other treatments. It is profitable for gardening of saving time from management.
2003, 32(6): 741-744.
Abstract:
The process which used H2O2 as oxidation agent to oxidize cassava starch and then modified with Urea-formaldehyde resin and first-drying agent in order to prepare fast-drying starch adhesive was studied systematically in this paper. The stuty showed that this kind of starch adhesive had strong and stability bonding strength,fast-drying property. On the other hand, the process technology was possessed of the prominent virtues such as simple processing equiment,operation conditions controlled easily,no pollution, ect.
The process which used H2O2 as oxidation agent to oxidize cassava starch and then modified with Urea-formaldehyde resin and first-drying agent in order to prepare fast-drying starch adhesive was studied systematically in this paper. The stuty showed that this kind of starch adhesive had strong and stability bonding strength,fast-drying property. On the other hand, the process technology was possessed of the prominent virtues such as simple processing equiment,operation conditions controlled easily,no pollution, ect.
2003, 32(6): 745-748.
Abstract:
By adding silver ions and zinc ions in CaHPO4 and sinter at 1 050oC, a novel Ag-series inorganic antibacterial agent with excellent bactericidal property and weather resistance can be made.The influence of ions concentration and sinter on bactericidal property and weather resistance are study. The tests result show that the bactericidal ability increase with increasing of silver ions and zinc ions; not only bactericidal ability increase, but also weather resistance of this antibacterial agent can be increased by adding zinc ions; the antibacterial agent do not change their colour when the concentration of Zn(NO3)2 is more than 2 times of AgNO3; sinter is beneficial to improving the weather resistance of this material.
By adding silver ions and zinc ions in CaHPO4 and sinter at 1 050oC, a novel Ag-series inorganic antibacterial agent with excellent bactericidal property and weather resistance can be made.The influence of ions concentration and sinter on bactericidal property and weather resistance are study. The tests result show that the bactericidal ability increase with increasing of silver ions and zinc ions; not only bactericidal ability increase, but also weather resistance of this antibacterial agent can be increased by adding zinc ions; the antibacterial agent do not change their colour when the concentration of Zn(NO3)2 is more than 2 times of AgNO3; sinter is beneficial to improving the weather resistance of this material.
2003, 32(6): 749-751.
Abstract:
In this paper, the disposal of real dyeing-wastewater was studied by the use of table designing and fixed bed reactor, and gained the optimal condition to remove CODcr and color, including light intensity、the beginning pH、time、concentration of H2O2. The results showed that CODcr and color of real dyeing-wastewater was reduced effectively by fixed bed reactor. The optimum conditions of treatment were determined to be:UV irradiation time 120 min; pH=6; 300 W high-pressure mercury vapour lamp; proper adding H2O2.
In this paper, the disposal of real dyeing-wastewater was studied by the use of table designing and fixed bed reactor, and gained the optimal condition to remove CODcr and color, including light intensity、the beginning pH、time、concentration of H2O2. The results showed that CODcr and color of real dyeing-wastewater was reduced effectively by fixed bed reactor. The optimum conditions of treatment were determined to be:UV irradiation time 120 min; pH=6; 300 W high-pressure mercury vapour lamp; proper adding H2O2.
2003, 32(6): 752-754.
Abstract:
There is a anatropous ovules in the ovary of mango fruit with one player of integument, the development of embryo sac follows polygonum type. At anthesis, the embryo sac may be in the stage of eight nuclei. Degeneration of polar nuclei and antipodals are found in one or different ovules. The shrinkage or degeneration of embryo because of the lackage of nutrient and hormone results in seedlessness. The seed coat of seedless mango is thin and normally developed. The conducting tissue in the coat of seedless mango is normal.
There is a anatropous ovules in the ovary of mango fruit with one player of integument, the development of embryo sac follows polygonum type. At anthesis, the embryo sac may be in the stage of eight nuclei. Degeneration of polar nuclei and antipodals are found in one or different ovules. The shrinkage or degeneration of embryo because of the lackage of nutrient and hormone results in seedlessness. The seed coat of seedless mango is thin and normally developed. The conducting tissue in the coat of seedless mango is normal.
2003, 32(6): 755-759.
Abstract:
It has been proved that free radicals not only decrease the nutritional value of food, but also destroy the membrane, enzyme, vitamin, protein and living cells. Natural antioxidant could safely scavenge the free radical and prevent oil from oxidizing. Extraction from loquat and mango peel showed strong antioxidative activities in different systems, including yolk lipoprotein and peanut oil. Two extractions could scavenge both hydroxyl radical (·OH) and active oxygen radicals (O·-) efficiently and safely. The antioxidant effect of extraction from mango peel is superior to that of loquat peel.
It has been proved that free radicals not only decrease the nutritional value of food, but also destroy the membrane, enzyme, vitamin, protein and living cells. Natural antioxidant could safely scavenge the free radical and prevent oil from oxidizing. Extraction from loquat and mango peel showed strong antioxidative activities in different systems, including yolk lipoprotein and peanut oil. Two extractions could scavenge both hydroxyl radical (·OH) and active oxygen radicals (O·-) efficiently and safely. The antioxidant effect of extraction from mango peel is superior to that of loquat peel.
2003, 32(6): 760-763.
Abstract:
Lycopene is a natural pigment with high market value because of it￠s function of resist cancer. For the low productivity and degree of purity of lycopene in China, the article analyze the stabilization, production, purification, separation of isomer and anaysis of lycopene. So it can be expected to provide the theory and practice for the development of lycopene industry.
Lycopene is a natural pigment with high market value because of it￠s function of resist cancer. For the low productivity and degree of purity of lycopene in China, the article analyze the stabilization, production, purification, separation of isomer and anaysis of lycopene. So it can be expected to provide the theory and practice for the development of lycopene industry.
2003, 32(6): 764-769.
Abstract:
This paper is aimed to provide an overview of the biosynthesis, extraction and purification, composition, physical and chemical properties, foreground and its application of exopolysaccharide produced by lactic acid bacterium.
This paper is aimed to provide an overview of the biosynthesis, extraction and purification, composition, physical and chemical properties, foreground and its application of exopolysaccharide produced by lactic acid bacterium.
2003, 32(6): 770-774.
Abstract:
A new class of completely generalized nonlinear implicit quasi-variational inclusions involving generalized m-accretive mappings for fuzzy mappings in q -uniformly smooth Banach space are introduced and studied. By using the Nadler's theorem and the resolvent operator technique for generalized m-accretive mapping, some new iterative algorithms for finding the approximate solutions of this class of variational inclusions are constructed and the existence of solution for this kind of variational inclusion are proved. The iterative sequences generated by the algorithms converge to the exact solution of the quasi-variational inclusions.
A new class of completely generalized nonlinear implicit quasi-variational inclusions involving generalized m-accretive mappings for fuzzy mappings in q -uniformly smooth Banach space are introduced and studied. By using the Nadler's theorem and the resolvent operator technique for generalized m-accretive mapping, some new iterative algorithms for finding the approximate solutions of this class of variational inclusions are constructed and the existence of solution for this kind of variational inclusion are proved. The iterative sequences generated by the algorithms converge to the exact solution of the quasi-variational inclusions.
2003, 32(6): 775-778.
Abstract:
In this paper, the maximal regular ideal of Matrix Algebra was formed. And using the relation of pure state and maximal regular ideal of C*-algebra, the pure state of Matrix Algebra was formed because the Matrix Algebra is a C*-algebra. so the structure of state space and dual space of Matrix Algebra was formed.And using the relation of dual space and state space of C*-algebra, the dual space of Matrix Algebra was formeal.
In this paper, the maximal regular ideal of Matrix Algebra was formed. And using the relation of pure state and maximal regular ideal of C*-algebra, the pure state of Matrix Algebra was formed because the Matrix Algebra is a C*-algebra. so the structure of state space and dual space of Matrix Algebra was formed.And using the relation of dual space and state space of C*-algebra, the dual space of Matrix Algebra was formeal.
2003, 32(6): 779-782.
Abstract:
In this paper we study the instability of certain nth order diferential eqution by means of Liapunov's function and obtain some sufficient conditions for the eqution being unstable. In particular it gives impetus to Ezelio etc's work and instability study of certain nonlinear differential equations to some extent.
In this paper we study the instability of certain nth order diferential eqution by means of Liapunov's function and obtain some sufficient conditions for the eqution being unstable. In particular it gives impetus to Ezelio etc's work and instability study of certain nonlinear differential equations to some extent.
2003, 32(6): 783-786.
Abstract:
Using leray-Schauder fixed point theorem with usual sobolev H∞ and certain weighed sobolev spaces build an initial value problem of a class of the extended nonlinear equation. The way of solution this equation can transfer to solution a fixed point φ of integrality uninterrupted figure had been proved. The global existing and uninterrupting of all fixed pointsφ exist in Bx[01] had been proved by using Leray-Schauder fixed point theorem. The result shows that solution of this equation can astringency to solution of initial value problem, get one and only smooth solution of this equation.
Using leray-Schauder fixed point theorem with usual sobolev H∞ and certain weighed sobolev spaces build an initial value problem of a class of the extended nonlinear equation. The way of solution this equation can transfer to solution a fixed point φ of integrality uninterrupted figure had been proved. The global existing and uninterrupting of all fixed pointsφ exist in Bx[01] had been proved by using Leray-Schauder fixed point theorem. The result shows that solution of this equation can astringency to solution of initial value problem, get one and only smooth solution of this equation.
2003, 32(6): 787-789.
Abstract:
The problem of BIBO and robust stabilization for system with time-delay and nonlinear perturbations are dealt with. First by using lyapunov function method, robust stabilization of the system is analyzed. Then, by using Gronwall inequation, the BIBO stabilization is analyzed. Two sufficient conditions for the system are concluded from the research. All the research is on the base of reference[1]. The result of this paper is quite different to the results of reference.
The problem of BIBO and robust stabilization for system with time-delay and nonlinear perturbations are dealt with. First by using lyapunov function method, robust stabilization of the system is analyzed. Then, by using Gronwall inequation, the BIBO stabilization is analyzed. Two sufficient conditions for the system are concluded from the research. All the research is on the base of reference[1]. The result of this paper is quite different to the results of reference.
2003, 32(6): 790-792.
Abstract:
JOR iterations for solving large linear system are studied. Based on the concept of the doubly diagonal dominance, an new upper bound for the spectral radius and convergence of JOR iterations are presented. Results obtained improve the known corresponding results and are suited to extended matrices. Finally, a numerical example is given for illustrating advantage of results in this paper.
JOR iterations for solving large linear system are studied. Based on the concept of the doubly diagonal dominance, an new upper bound for the spectral radius and convergence of JOR iterations are presented. Results obtained improve the known corresponding results and are suited to extended matrices. Finally, a numerical example is given for illustrating advantage of results in this paper.
