共查询到20条相似文献，搜索用时 656 毫秒
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The quantity of work is needed to calculate the cost in tender offer and bidding. We represent the characteristic of KQML and put forward the idea of constructing the cost calculation system, which includes quantities calculation agents and cost calculation agents, applicable for not only tender bidding but also tender offer. The emphasis is to construct the communications mechanism between two kinds of agents by KQML. Then a communications application example between two kinds of Agent is depicted. 相似文献
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This paper expatiates on the bus structure and develop the bus mode Multi-Channel Analyzer (MCA). The nucleus of this MCA is the PC/104 embedded computer, and it introduces the bus communication to realize system and data communication. It may realize data collecting and showing in the field, because the bus mode is rapid. At first, on the hardware we introduce CMOS components, this reduces power, volume and weight. These make it adapts to use in the field; besides, on the software we adopt C and assembly language to program in order to improve conversion speed. At the same time, single-task DOS operating system is infroduced, which makes the software run more steadily, operate more simply. By means of testing on the spot it can normally work, so it suitable to work in the field. 相似文献
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In CDMA communication system, the relativities between users result in Multiple Access Interference (MAI). With the increase of users, MAI becomes the main jam of broadband CDMA communication system. Multi-User Detection (MUD) is the most important technology of anti-jamming in the broadband CDMA communication system, which can eliminates MAI effectively by using the information of all user signals to detection single. This paper analyze the expression of system capability without MUD and with MUD, and puts forward the way to increase system capability by using MUD. Then the influence of MUD on CDMA system capability is discussed by MATLAB emulation. Basing analysis and emulation, the conclusion is got: the higher the MUD efficiency, the better the improvement of CDMA system capability; under the same MUD efficiency, the lower data rate, the smaller inter-cell interference, the lower the ratio of bit energy to power spectrum, the better the improvement of CDMA system capability. 相似文献
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Victor R. Savage 《Asia Pacific viewpoint》2011,52(2):219-227
While this article accepts the idea of regional Journal cooperation within the context of establishing an ASEAN Integrated Journal Publishing Network as a positive and pertinent step, it explores three major hurdles that regional universities need to contend with. These include firstly, the dominance of English as the major academic language which puts vernacular languages and communication at a distinct disadvantage and resurrects a neo‐colonial academic mindset; secondly, tertiary education is generally weak in the region and in most cases universities are focused on teaching and service to government rather than academic research. Thirdly, universities in Southeast Asia, both in terms of academic salaries and the research infrastructure (libraries, laboratories) is financially handicapped and poorly supported. Regional academic journals cater to their 'home' informed audiences and respond less to international standards which makes universal or regional benchmarking difficult. 相似文献
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AMT (Automatic Manual Transmission) comprehensive performance test is one of the main means to develop and evaluate AMT. An overall scheme of the data acquisition and communication system for AMT comprehensive performance test bench is proposed according to the requirement of the test bench, and a communication network of data acquisition and communication system is built. The hardware and software of data acquisition system are designed. The experiments show that the system meets the requirement of data acquisition and communication system for AMT comprehensive performance test bench and it lays a foundation for AMT comprehensive test research. 相似文献
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Unified modeling language(UML) is an object-oriented(OO) modeling notation standard,which could be used in various developing environment and software life cycle.The authors discuss how to the use the UML to complete the use-case modeling,static modeling and dynamic modeling of the university student individual credit evaluation management information system.They believe that the UML can improve the documentation,visualization and standardization of the system and ensure a better reliability and reusability. 相似文献
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The topic of this thesis is ultraviolet communication system,one model of the Free Space Optics(FSO).The Free Space Optics communication system for civil use regards infrared light as transmission medium.However,for military use,if we want to establish a local communication system(about 1.5 km) with jamproof and safe,it is impossible to use infrared as transmission medium.Based on the predecessors' research and struggle,they discovered that ultraviolet light,especially the ultraviolet light in the solar blind light spectrum is a perfect transmission medium.Because of the absorption of air and scattering process in the atmosphere it can provide a suitable transmission distance and the ability to get over obstacles.The importance of the thesis is to introduce the key devices used in the communication system. 相似文献
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This paper presents structure, characteristic and condition of microprocessor based relay communication system. A available start network configuration for the system is put forward. Message manager is used in the net. Some problems appearing in serial communication of field unit are also discussed. A way is brought forward for the communication system, which is an application of PTS function of 80C196KC SCM. The order is proposed for the PTS's one transmission model, which is the data longness must be destined in the net message agreement. A data redundance technic is adopted for improved message dependability. 相似文献
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Yao Jianing 《保鲜与加工》1988,(2)
This paper presents a method of solving the problem of Chinese charactor information processing by building special Chinese charaacter library and simplifying Chinese character input/output technique in real-time supervisory system. It is successful to apply this method to the TF-200 Data Processing System. This method can be applied to other similar system. It is feasible to use Chinese characters in the language environment which Operation System (OS) supports. 相似文献
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A design scheme using IEEE1394 serial interface to achieve communication between PC computer and DSP controller is introduced, which is used in real-time imitating for car-engine integrated controlling system. First, the rule of high speed IEEE1394 serial communication using TSB41BA3/TSB12LV01B interface is discussed. Further, the design scheme of software and hardware of communication sub-system is probed. The application effect is good in the car-engine integrated controlling system developed. 相似文献
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LIU Xiao-ming~ 《保鲜与加工》2003,(12):39-42
During the process of developing the Car Continuously Variable Transmission, the Control rule of the system is so complicated that we have to adjust and modificate the control parameters often. Direct debugging and empoldering by using singlechip system will result in long empoldering period and low efficiency. The present article presents an empolder scheme based on the control of Personal Computer. In the empoldering process we will predigest the Car Transmission Control Unit of the Continuously Variable Transmission into an extension which is only used for parameter tracking and measurement, while the matching control of the system and the parameter monitor is achieved with the host computer. Serial communication is carried out in the communication between the host computer and the extension. In addition, we have developed the corresponding monitoring and debugging software with Visual C++ 6.0 also. The practice shows that the system has successfully realized the empoldering of the TCU(Transmission Control Unit) with great efficiency. 相似文献
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How to develop Virtual x Driver(VxD) in windows system bottom layer is given to realize high efficiency interrupt communication of serial port. By analyzing Virtual x Driver, Programable Interrupt Controller, how to virtually a interruption is proposed. With the operational principle of UART chip 8250, the communication of serial port is analyzed. Finally, the communication between WIN32 application and VxD is discussed, and the constitute of the VxD is given. The applied solid example expresses that method of the serial port communication is efficient. 相似文献
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Deng Renming Wang Daen Lin Ying 《保鲜与加工》1993,(3):36-41
The communication of the application program among work tations of 3+ network is realized by the shared file on harddisk of the network server,which does not support the application program' s real-time communication among the network workstations nor supplies software or hardware needed for information refreshing, nor fits for field multibatch continuous real-time transmission and processing of working condition information, by using the NETBIOS function call method, the real-time communication among network workstations is realized and a power plant working information background real-time communication and data processing system is developed which effectively traces working condition from tow 200 MW power plant generators, altogether 321 points from a cycling detecting system and 78 binary points for broadcasting the information to other workstations,and realizes a complx display of 14 working condition graphs and a real-time data simulation graph. 相似文献
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It is usually need to supervise and control gathering data and working status of PLC in industry control.There are some ways such as VB,DELPHI,PB to carry out the requirement.Visual C++ is an exploiture tool for Windows application program and has quite strong function in the aspect of image processing and database managing etc.It has faster speed to realize bottom communication control.Using Visual C++ and MFC,the authors implement the serial communication system between PC and PLC.The paper introduces the communication protocol and software design method and realizes data's sending and incepted rapidly,real-time auto-control accurately and quickly.This system is simple,economical,and reliable and has an application value,which has been applied successfully in real system. 相似文献
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The multicarrier-code division multiple access (MC-CDMA),which is the combination of direct sequence CDMA (DS-CDMA) and orthogonal frequency division multiplexing (OFDM) techniques, offers various advantages over single-carrier CDMA system. Some of the advantages are that MC-CDMA systems possess can remove the intersymbol interference (ISI) and enhance narrow-band interference suppression capabilities. So the MC-CDMA technique becomes a focus in the field of mobile communication. The authors introduce the typical MC-CDMA system model, discuss the decision statisticalvariable in Rayleigh fading channel included the CW interference, and give the expressions of probability of error in uplink. An approach is proposed with Modified Equal Gain Combining (MEGC) to decrease the effect of CW interference. Theoretical analysis and numerical results show that the anti-CW interference performance of MC-CDMA system can be improved used the MEGC approach. 相似文献
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CHEN Shuai~ 《保鲜与加工》2004,(10):114-117
Data receiving system of GPS system based on Linux was completed. The embedded MCF5272 system, M12 and G18 modules were used in the application based on uClinux. Taken MCF5272 as core, satellite position data were obtained through GPS(Global Positing System)module M12,and uClinux operation system was used in the system for controlling. By G18 module, the GPS data can be transmitted to wireless mobile network linked to Internet and received by remote server, which had been linked to Internet also. The constitution of embedded system is gived and the principle of GPS is introduced. The soft for GPS receiving is realized in uClinux system with C language, and the test data are gived in the end. The resolution of the system is that latitude and longitude: 1 milliarcsecond, height: 0.01 m, velocity: 0. 01 m/s. 相似文献
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The data acquisition and processing system are proceeding towards faster, more powerful, easier to use and more cost effectiveness. This paper discuss the design of the high speed and convenient data acquisition and processing system based on DSP and USB 2.0, and expatiates the principle and method of the virtual instruments system in detail. The system employs an ADS8346 to sample the six channel signals simultaneously with a resolution of 16-bit.It utilizes EZ-USB FX2 as the USB2.0 interface, which can achieve the high speed communication between the host and the system. It uses TMS320VC33 (dsp) as the core chip, which can accomplish the function of the main control and real-time digital signal processing. The system enhances the virtual instruments' advantage more by the combination between software and hardware. 相似文献