In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used t...In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used to solve the assignment problem of serial-parallel systems. First of all, by replacing parallel jobs with virtual jobs, the proposed algorithm converts the serial-parallel system into a pure serial system, where the classical Hungarian algorithm can be used to generate a temporal assignment plan via optimization. Afterwards, the assignment plan is validated by checking whether the virtual jobs can be realized by real jobs through local searching. If the assignment plan is not valid, the converted system will be adapted by adjusting the parameters of virtual jobs, and then be optimized again. Through iterative searching, the valid optimal assignment plan can eventually be obtained.To evaluate the proposed algorithm, the valid optimal assignment plan is applied to labor allocation of a manufacturing system which is a typical serial-parallel system.展开更多
Differed from the existed applications of generalized stochastic Petri net(GSPN) theory in machine-tool manufacturing system, reliability computation of FMS, testabilityparameters determination and fault analysis, a n...Differed from the existed applications of generalized stochastic Petri net(GSPN) theory in machine-tool manufacturing system, reliability computation of FMS, testabilityparameters determination and fault analysis, a new idea of applying GSPN to model and performanceanalysis for the serial and parallel production system is proposed. And one typical discrete eventdynamic system (DEDS), turner-unit of palletizing system, is taken as a real case to research. Basedupon the established GSPN models, the working performances of serial and parallel layout arecompared. Furthermore, their differences of working mechanisms including feeding mechanism,coordinating mechanism and monitoring mechanism are discussed. Thus the theoretical basis which ishelpful to appraise layout plan and its reasonableness is provided. Meanwhile, the research resultsshow that parallel layout is more advantageous to greatly improve the operational speed ofproduction system than serial one.展开更多
The multi-tone interference suppression in HF serial data transmission systemsis analyzed.Analytic expression for the tap weights and minimum mean square errors of theadaptive equalizer in HF serial systems are obtain...The multi-tone interference suppression in HF serial data transmission systemsis analyzed.Analytic expression for the tap weights and minimum mean square errors of theadaptive equalizer in HF serial systems are obtained.The rate of convergence of equalizer indicatethat the equalizer in HF serial system can not only track the rapid variation of HF channel butalso suppress the multi-tone interferences perfectly.展开更多
In the paper,a serial service System involving two service counters with finite walting space is discussed based on Serial queueing system with two service mechanism. Moreover,thegeneral recurrence formulas of probali...In the paper,a serial service System involving two service counters with finite walting space is discussed based on Serial queueing system with two service mechanism. Moreover,thegeneral recurrence formulas of probalillty distribution Pi.j}of the system under statistical equibrium are derived and several corresponding quantitative indexes are given.展开更多
The mathematical models of electro-hydraulic speed control system using series of pipesis presented. The principle of pipe effection on dynamics of the system is developed. Computersimulation and physical experiment a...The mathematical models of electro-hydraulic speed control system using series of pipesis presented. The principle of pipe effection on dynamics of the system is developed. Computersimulation and physical experiment are also carried out. The experimental results show that a rightchoosing of serial pipe for electro-hydraulic system enables the dynamic response of the system tobe improved effectively.展开更多
深海微生物在全球碳氮循环中起到重要作用,目前对深海微生物的精细化研究主要以实验室高压模拟培养检测为主,当深海样品采集至实验室培养检测时,温度、压力等环境参数会有一定程度的变化,影响后续的试验与检测。为此,设计了一种用于深...深海微生物在全球碳氮循环中起到重要作用,目前对深海微生物的精细化研究主要以实验室高压模拟培养检测为主,当深海样品采集至实验室培养检测时,温度、压力等环境参数会有一定程度的变化,影响后续的试验与检测。为此,设计了一种用于深海微生物原位自动序列培养的装置(ocean automatic series incubation system,OASIS)。文章围绕OASIS的工作原理、系统组成和试验验证等方面展开论述,重点研究深海液体转移精度问题。OASIS已经通过了水池试验、压力试验、海上试验等各项测试,试验结果表明:该装置能在30MPa高压下正常工作,按照时间顺序自动完成对微生物的培养与生命信息固定,对准确认识深海生态系统的生态效益提供了良好的设备支撑。展开更多
针对采用控制器局域网络(CAN:Controller Area Network)总线的自动操舵系统和采用串口通讯的航海导航设备之间通讯的不匹配问题,设计了一种基于Cortex-M3嵌入式平台的通信转换模块,实现了串口与CAN总线数据的双向转换功能。同时对传统CA...针对采用控制器局域网络(CAN:Controller Area Network)总线的自动操舵系统和采用串口通讯的航海导航设备之间通讯的不匹配问题,设计了一种基于Cortex-M3嵌入式平台的通信转换模块,实现了串口与CAN总线数据的双向转换功能。同时对传统CAN收发器CTM1050存在的信号稳定性不足、波特率精准度低等问题,提出并实现了一种硬件电路的替代方案,提高了数据通讯的时效性和稳定性。基于CAN2.0B扩展帧,设计了自动操舵系统内部CAN总线协议。该协议可根据报文信息优先级分配标识帧,保证了总线数据的有序传输。实验结果表明,该通讯模块功能使用正常且通讯效果良好,具有一定通用性,可在多种需要转换的设备系统上推广使用。展开更多
近年来,广播电视技术转型向网际互连协议(Internet Protocol,IP)化发展的进程逐渐加快,基于IP架构的电视技术系统必将取代传统串行数字接口(Serial Digital Interface,SDI)架构,成为未来电视技术的发展方向。对以互联网协议网关(Interne...近年来,广播电视技术转型向网际互连协议(Internet Protocol,IP)化发展的进程逐渐加快,基于IP架构的电视技术系统必将取代传统串行数字接口(Serial Digital Interface,SDI)架构,成为未来电视技术的发展方向。对以互联网协议网关(Internet Protocol Gateway,IPG)作为关键设备搭建“SDI+IP”混合架构系统的设计方案进行深入分析,阐述电视技术系统从SDI向IP技术转型过程中尽可能实现平稳过渡的思路。展开更多
针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值...针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值计算方法。采用VL817、TUSB522P及FSUSB74芯片设计3路智能USB 3.0电路方案,通过HUB硬复位重置、D+/D-、SSTX/SSRX信号通道复用输入输出(Input Output,IO)控制以及时序控制USB设备切换顺序的方法,提高系统的抗干扰能力。实测数据显示,应用该电路系统后运行稳定,系统切换时USB外设的识别成功率显著高于同类产品,契合大规模产业化设计及应用需求。展开更多
This study examined the gene expression patterns of peripheral blood mononuclear cells （PBMCs） in patients with systemic lupus erythematosus （SLE） by using serial analysis of gene expression （SAGE） technology. F...This study examined the gene expression patterns of peripheral blood mononuclear cells （PBMCs） in patients with systemic lupus erythematosus （SLE） by using serial analysis of gene expression （SAGE） technology. Following the construction of serial analysis of gene expression （SAGE） library of PBMCs collected from 3 cases of familial SLE patients, a large scale of tag Sequencing was performed. The data extracted from sequencing files was analyzed with SAGE 2000 V 4.5 software. The top 30 expressed genes of SLE patients were uploaded to http：//david.niaid.nih.gov/david/ease.htm and the functional classification of genes was obtained. The differences among those expressed gene were analyzed by Chi-square tests. The results showed that a total of 1286 unique SAGE tags were identified from 1814 individual SAGE tags. Among the 1286 unique tags, 86.8% had single copy, and only 0.2% tags had more than 20 copies. And 68.4% of the tags matched known expressed sequences, 41.1% of which matched more than one known expressed sequence. About 31.6% of the tags had no match and could represent potentially novel genes. Approximately one third of the top 30 genes were ribosomal protein, and the rest were genes related to metabolism or with unknown functions. Eight tags were found to express differentially in SAGE library of SLE patients. This study draws a profile of gene expression patterns of PBMCs in patients with SLE. Comparison of SAGE database from PBMCs between normal individuals and SLE patients will help us to better understand the pathogenesis of SLE.展开更多
文摘In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used to solve the assignment problem of serial-parallel systems. First of all, by replacing parallel jobs with virtual jobs, the proposed algorithm converts the serial-parallel system into a pure serial system, where the classical Hungarian algorithm can be used to generate a temporal assignment plan via optimization. Afterwards, the assignment plan is validated by checking whether the virtual jobs can be realized by real jobs through local searching. If the assignment plan is not valid, the converted system will be adapted by adjusting the parameters of virtual jobs, and then be optimized again. Through iterative searching, the valid optimal assignment plan can eventually be obtained.To evaluate the proposed algorithm, the valid optimal assignment plan is applied to labor allocation of a manufacturing system which is a typical serial-parallel system.
基金This project is supported by National 863 Hi-Tech Project of China (No.512980106) Provincical Natural Science Foundation of Zhejiang (No.ZD0107).
文摘Differed from the existed applications of generalized stochastic Petri net(GSPN) theory in machine-tool manufacturing system, reliability computation of FMS, testabilityparameters determination and fault analysis, a new idea of applying GSPN to model and performanceanalysis for the serial and parallel production system is proposed. And one typical discrete eventdynamic system (DEDS), turner-unit of palletizing system, is taken as a real case to research. Basedupon the established GSPN models, the working performances of serial and parallel layout arecompared. Furthermore, their differences of working mechanisms including feeding mechanism,coordinating mechanism and monitoring mechanism are discussed. Thus the theoretical basis which ishelpful to appraise layout plan and its reasonableness is provided. Meanwhile, the research resultsshow that parallel layout is more advantageous to greatly improve the operational speed ofproduction system than serial one.
文摘The multi-tone interference suppression in HF serial data transmission systemsis analyzed.Analytic expression for the tap weights and minimum mean square errors of theadaptive equalizer in HF serial systems are obtained.The rate of convergence of equalizer indicatethat the equalizer in HF serial system can not only track the rapid variation of HF channel butalso suppress the multi-tone interferences perfectly.
文摘In the paper,a serial service System involving two service counters with finite walting space is discussed based on Serial queueing system with two service mechanism. Moreover,thegeneral recurrence formulas of probalillty distribution Pi.j}of the system under statistical equibrium are derived and several corresponding quantitative indexes are given.
文摘The mathematical models of electro-hydraulic speed control system using series of pipesis presented. The principle of pipe effection on dynamics of the system is developed. Computersimulation and physical experiment are also carried out. The experimental results show that a rightchoosing of serial pipe for electro-hydraulic system enables the dynamic response of the system tobe improved effectively.
文摘深海微生物在全球碳氮循环中起到重要作用,目前对深海微生物的精细化研究主要以实验室高压模拟培养检测为主,当深海样品采集至实验室培养检测时,温度、压力等环境参数会有一定程度的变化,影响后续的试验与检测。为此,设计了一种用于深海微生物原位自动序列培养的装置(ocean automatic series incubation system,OASIS)。文章围绕OASIS的工作原理、系统组成和试验验证等方面展开论述,重点研究深海液体转移精度问题。OASIS已经通过了水池试验、压力试验、海上试验等各项测试,试验结果表明:该装置能在30MPa高压下正常工作,按照时间顺序自动完成对微生物的培养与生命信息固定,对准确认识深海生态系统的生态效益提供了良好的设备支撑。
文摘5G新技术应用于可见光通信(Visible Light Communication,VLC)场景对系统容量以及频谱效率有了更高的要求,稀疏码多址接入(Sparse Code Multiple Access,SCMA)技术作为一种新型的非正交多址接入(Non-Orthgonal Multiple Access,NOMA)技术可作为解决方案。针对上述方案,搭建了VLC-SCMA系统,使得系统在相同的频谱资源下能够拥有更大的系统容量和频谱效率,同时为了降低系统复杂度,加快接收端进行多用户检测时的收敛速度,提出了基于串行改进下的部分外部信息传递的消息传递算法(Message Passing Algorithm Based on Serial Strategy for Partial External Information Transmission,SPEIT-MPA)。通过在迭代过程中设置门限值过滤掉携带信息量较少的外部信息点,利用串行改进使得算法迭代过程进一步简化。在VLC-SCMA系统中的仿真结果表明,对比原始算法,新算法可以在保证误码率(Bit Error Rate,BER)性能损失较少的前提下拥有更快的收敛速度,且算法复杂度随着信噪比(Signal to Noise Ratio,SNR)的增大明显降低。
文摘针对采用控制器局域网络(CAN:Controller Area Network)总线的自动操舵系统和采用串口通讯的航海导航设备之间通讯的不匹配问题,设计了一种基于Cortex-M3嵌入式平台的通信转换模块,实现了串口与CAN总线数据的双向转换功能。同时对传统CAN收发器CTM1050存在的信号稳定性不足、波特率精准度低等问题,提出并实现了一种硬件电路的替代方案,提高了数据通讯的时效性和稳定性。基于CAN2.0B扩展帧,设计了自动操舵系统内部CAN总线协议。该协议可根据报文信息优先级分配标识帧,保证了总线数据的有序传输。实验结果表明,该通讯模块功能使用正常且通讯效果良好,具有一定通用性,可在多种需要转换的设备系统上推广使用。
文摘针对具备Andriod和Windows双系统的电子设备在使用通用串行总线(Universal Serial Bus,USB)接口与外设通信时出现的需重新插拔USB外设、切换后USB设备不识别率偏高等问题,通过对电路进行分析和设计优化,提出一种电源管理电路的参数取值计算方法。采用VL817、TUSB522P及FSUSB74芯片设计3路智能USB 3.0电路方案,通过HUB硬复位重置、D+/D-、SSTX/SSRX信号通道复用输入输出(Input Output,IO)控制以及时序控制USB设备切换顺序的方法,提高系统的抗干扰能力。实测数据显示,应用该电路系统后运行稳定,系统切换时USB外设的识别成功率显著高于同类产品,契合大规模产业化设计及应用需求。
基金This project was supported by a grant form the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry (No [2002]247)
文摘This study examined the gene expression patterns of peripheral blood mononuclear cells （PBMCs） in patients with systemic lupus erythematosus （SLE） by using serial analysis of gene expression （SAGE） technology. Following the construction of serial analysis of gene expression （SAGE） library of PBMCs collected from 3 cases of familial SLE patients, a large scale of tag Sequencing was performed. The data extracted from sequencing files was analyzed with SAGE 2000 V 4.5 software. The top 30 expressed genes of SLE patients were uploaded to http：//david.niaid.nih.gov/david/ease.htm and the functional classification of genes was obtained. The differences among those expressed gene were analyzed by Chi-square tests. The results showed that a total of 1286 unique SAGE tags were identified from 1814 individual SAGE tags. Among the 1286 unique tags, 86.8% had single copy, and only 0.2% tags had more than 20 copies. And 68.4% of the tags matched known expressed sequences, 41.1% of which matched more than one known expressed sequence. About 31.6% of the tags had no match and could represent potentially novel genes. Approximately one third of the top 30 genes were ribosomal protein, and the rest were genes related to metabolism or with unknown functions. Eight tags were found to express differentially in SAGE library of SLE patients. This study draws a profile of gene expression patterns of PBMCs in patients with SLE. Comparison of SAGE database from PBMCs between normal individuals and SLE patients will help us to better understand the pathogenesis of SLE.
