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2008 ISECS International Colloquium on Computing, Communication, Control, and Management最新文献

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The Reconstruction of Agriculture Supply Chain Based on Information Sharing 基于信息共享的农业供应链重构
Qi Ming, Xie Jingxu
The paper analyses the actuality of agriculture from the perspective of the supply chain, concluded the mode and the deficiency of current agriculture supply chain, then constructs one kind of new supply chain mode based on information sharing which fits China's agricultural development, and analysis the new mode from the perspective of value chain, finally provides a case of Gannan navel orange industry to invest the practicability of this mode.
本文从供应链的角度分析了农业的现状,总结了当前农业供应链的模式和不足,构建了一种适合中国农业发展的基于信息共享的新型供应链模式,并从价值链的角度对新模式进行了分析,最后以甘南州脐橙产业为例说明了该模式的实用性。
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引用次数: 1
A Multiobjective Optimization of Location Based Services Network in Mobile Commerce Based on Customer Satisfaction 基于顾客满意度的移动商务位置服务网络多目标优化
Min Zhang, Weiwei Yan
Independent studies have shown that mobile commerce (m-commerce) can have an important influence on business and society in the future. Hence, network designers, service providers, vendors and application developers must carefully take the needs and considerations of various users into account to provide better services and attract them to m-commerce. Consequently, maximizing the m-commerce user requirements and their significance becomes an essential and crucial process for the standardization and improvement of associated systems. On this line, the objective of this paper is to propose a multi-objective optimization model of location based services(LBS) network. The process of modeling focuses on customer satisfaction to provide practitioners a more effective and efficient model for enhancing m-commerce service level and prioritizing m-commerce requirements.
独立研究表明,移动商务(m-commerce)可以在未来对商业和社会产生重要影响。因此,网络设计者、服务提供商、供应商和应用程序开发人员必须仔细考虑各种用户的需求和考虑因素,以提供更好的服务,吸引他们进入移动商务。因此,最大化移动商务用户需求及其意义成为相关系统标准化和完善的必要和关键过程。基于此,本文的目标是提出一个基于位置服务(LBS)网络的多目标优化模型。建模过程以客户满意度为中心,为从业人员提高移动商务服务水平和优化移动商务需求提供一个更有效、更高效的模型。
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引用次数: 2
A Modified Remote User Authentication and Key Agreement Scheme Using Smart Cards 一种改进的智能卡远程用户认证与密钥协商方案
Lijiang Zhang, Puwen Wei
In 2000, Hwang and Li proposed a new remote user authentication scheme using smart cards. Chan-Cheng, Shen-Lin-Hwang and then Chang-Hwang pointed out some attacks on Hwang-Li's scheme. Shen-Lin-Hwang also proposed a modified scheme. In 2003, Leung et al showed that the modified scheme is still vulnerable to some previous attacks. In 2004, Kumar proposed a new scheme to solve these problems. In this paper, we find out that some weaknesses still exist in Kumar's scheme and present a modified remote user authentication and key agreement scheme using smart cards to conquer them. The proposed scheme also generates a common session key.
2000年,Hwang和Li提出了一种新的使用智能卡的远程用户认证方案。Chan-Cheng, Shen-Lin-Hwang和Chang-Hwang指出了一些对黄利计划的攻击。沈林黄也提出了一个修改方案。2003年,Leung等人表明,修改后的方案仍然容易受到先前的一些攻击。2004年,库马尔提出了一个解决这些问题的新方案。针对Kumar方案中存在的一些缺陷,提出了一种改进的基于智能卡的远程用户认证与密钥协商方案。该方案还生成一个公共会话密钥。
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引用次数: 0
Using Operational Amplifiers to Realize the Compensation of Thermocouples 利用运算放大器实现热电偶补偿
Anan Fang, Xiaoli Ye, An Chen, Xiaoling Xu, Rong Yu
It was commonly modified a thermocouple transducer artificially and piecewise through the presupposed values in order to compensate its nonlinearity effects on the temperature measurement. In doing so, although it can solve some errors in measurement, the parameters appear to be divergent from one to another for the same group of thermocouple transducers, and hence compensations must be executed for each of them. The work is heavy, the efficiency is low and the effect is poor. Just for those reasons, the designers have been obsessed with such sort of issues, which are sticky ones in front of them as well. Is there a better way to help them out of the present predicament? Yes, The author has found out the relationship among the external temperature, the measured temperature and the thermoelectric potential generated through the thermocouple transducer by comparing a great deal of thermocouple transducers, that is,there is a certain linear relationship existing in a high-order power series function. So we have used high-speed operational amplifiers to compute the high-order power series function and compensate the circuit in order to realize the real-time compensation for thermocouple transducers, which has not only realized the linearity optimization of them, but also got the instantaneous time of temperature measurement. In the end the accuracy of the controlled temperature has greatly increased. The results are satisfying according to the application of temperature-controlled furnaces.
为了补偿热电偶传感器对温度测量的非线性影响,通常采用人为的、分段的方法,通过预设值对热电偶传感器进行修正。在这样做时,虽然它可以解决测量中的一些误差,但对于同一组热电偶传感器,参数似乎彼此不同,因此必须对每个热电偶传感器执行补偿。工作繁重,效率低,效果差。正是因为这些原因,设计师们一直沉迷于这类问题,这也是他们面前的棘手问题。有没有更好的办法帮助他们摆脱目前的困境?是的,作者通过对大量热电偶传感器的比较,发现了外部温度、被测温度与热电偶传感器产生的热电势之间的关系,即在高阶幂级数函数中存在一定的线性关系。为此,我们采用高速运算放大器计算高阶功率串联函数并对电路进行补偿,实现对热电偶传感器的实时补偿,不仅实现了传感器的线性优化,而且得到了温度测量的瞬时时间。最后,控制温度的精度大大提高。通过温控炉的实际应用,取得了满意的效果。
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引用次数: 3
The Digital Integrated Research of Product Design Based on Assembly Model 基于装配模型的产品设计数字化集成研究
Xiaoxia Chen, Shuzhong Lin, J. Xing
To improve performance of product in early concept design stage, a digital integrated design and analysis system is proposed which integrated CAD and CAE in the same environment. The system creates a characteristic information center including a set of features parameters and assembly constraints based on analysis of the parameters and assembly relationships of product assembly model. The coherence and reusability of the information expression of product are concentrated on in design stage. The CAD modeling and CAE modeling of product are shared same characteristic information center. So if any of them is changed, the other will be updated in the same time. An example is given to illustrate the benefits of integrated assembly modeling technology.
为了提高产品在概念设计初期的性能,提出了一种将CAD和CAE集成在同一环境下的数字化集成设计分析系统。该系统在分析产品装配模型的参数和装配关系的基础上,建立了包含一组特征参数和装配约束的特征信息中心。设计阶段注重产品信息表达的一致性和可重用性。产品的CAD建模和CAE建模共享同一个特征信息中心。因此,如果其中任何一个更改,另一个将同时更新。通过实例说明了集成装配建模技术的优点。
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引用次数: 0
The Crypto Transmission in HF Wireless Environment 高频无线环境下的密码传输
Jinkeun Hong, Kunhee Han
An efficient interleaving algorithm is applied to reduce the loss of ciphered MELP encoding information when a cipher system transmits over a wireless HF fading channel environment. As such, a new scheme for deciding the interleaving depth over a wireless environment is described. Simulations confirm that the proposed efficient algorithm with a variable interleaving depth produces a better performance over a HF fading channel than a static depth with a fixed interleaving depth. Experimental results showed that the BER performance of the proposed efficient interleaving scheme is higher than that of the fixed interleaving depth scheme. Of particular note is that the dynamic allocation algorithm (DAA) reduces degraded error bits by up to 25%, compared with static allocation algorithm (SAA) of depth 48 in HF channel.
为了减少密码系统在无线高频衰落信道环境下传输时加密MELP编码信息的丢失,提出了一种有效的交错算法。因此,描述了一种在无线环境中确定交错深度的新方案。仿真结果表明,在高频衰落信道中,可变交错深度的有效算法比固定交错深度的静态深度算法具有更好的性能。实验结果表明,所提出的高效交错方案的误码率优于固定交错深度方案。特别值得注意的是,在高频信道中,与深度为48的静态分配算法(SAA)相比,动态分配算法(DAA)可减少高达25%的降级错误位。
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引用次数: 0
An Improved Delta and Over-issued Certificate Revocation Mechanism 改进的Delta和过度颁发的证书撤销机制
Shaomin Zhang, Haijiao Wang
With the increasing acceptance of digital certificates, how to find and revoke digital certificate which has been stopped has been become more and more important, which can avoid huge economic losses to end-user. At present the most popular choice is the use of lightweight directory access protocol (LDAP) directory server to issue the certificate revocation list (CRL). Based on the analysis of the certificate storage and publish in LDAP server, a new and more efficient certificate revocation mechanism is proposed in this paper. The new mechanism integrates Delta and over-issued CRL and windowed certificate revocation mechanism, which satisfies the scalability and flexibility requirements of certificate revocation mechanism, at the same time, and can provide near real-time certificate status when required. The design and performance of the new mechanism are analyzed in detail. CRL is organized in the form of binary sort tree structure in LDAP, which satisfies the query of the revocation of certificates rapidly in LDAP.
随着人们对数字证书的接受程度越来越高,如何查找和撤销已停止使用的数字证书变得越来越重要,从而避免给最终用户造成巨大的经济损失。目前最流行的选择是使用轻量级目录访问协议(LDAP)目录服务器来颁发证书撤销列表(CRL)。本文在分析证书在LDAP服务器上存储和发布的基础上,提出了一种新的更有效的证书撤销机制。新机制集成了Delta和超颁发CRL以及有窗口的证书吊销机制,同时满足了证书吊销机制的可扩展性和灵活性要求,可以在需要时提供近乎实时的证书状态。详细分析了该机构的设计和性能。CRL在LDAP中采用二叉排序树结构进行组织,可以满足LDAP中快速查询证书吊销的要求。
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引用次数: 7
Scheme to Prevent Denial of Service Attacks on UPnP 防止UPnP拒绝服务攻击的方案
Jiahui Wang, Liang He, Zili Zhou
Denial of service (DoS) attack can be easily launched for the simple service discovery Protocol (SSDP) on Universal Plug and Play (UPnP). This paper proposes a novel DoS defense scheme on UPnP. The connection between UPnP devices and attack nodes will be limited, and the useless descriptions received by the UPnP control points will be filtered through setting packet-filter with traffic anomaly detection on the active nodes and rule-based XML firewall on the UPnP control points. Finally, the paper analyzes the performance of this scheme, which shows its particular advantages.
针对UPnP (Universal Plug and Play)上的简单服务发现协议SSDP (simple service discovery Protocol),容易发起DoS (Denial of service)攻击。提出了一种新的基于UPnP的DoS防御方案。UPnP设备与攻击节点之间的连接将受到限制,UPnP控制点接收到的无用描述将通过在主节点上设置流量异常检测包过滤和在UPnP控制点上设置基于规则的XML防火墙进行过滤。最后对该方案的性能进行了分析,显示了其独特的优点。
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引用次数: 2
Prediction-Based Link-Layer Dynamic Fragmentation and Aggregation for Wireless Mesh Networks 基于预测的无线网状网络链路层动态分片与聚合
Lei Zhang, Shoubao Yang, Gaofeng Wang, Wanli Dong
Packet retransmissions due to packet losses reduce transmission performance in wireless networks obviously. Multi-hop wireless networks suffer from packet losses more than one-hop wireless networks. High bit-error rate of wireless channel and frequent channel collision due to shared channel are the most important ingredients of packet loss in multi-hop wireless networks. When bit error rate is between 10-3~10-4, fragment size control is efficient to enhance transmission performance. After analyzing the packet loss reason in wireless mesh networks, a prediction-based link-layer dynamic frame fragmentation and aggregation scheme called PDFA is proposed for 802.11-based wireless mesh networks. The size of sending fragment is optimized based on the prediction of channel BER. Simulation experiments validate that PDFA enhances transmission performance in wireless mesh networks efficiently.
在无线网络中,由于丢包引起的重传会明显降低传输性能。多跳无线网络比单跳无线网络更容易丢包。在多跳无线网络中,无线信道的高误码率和共享信道导致的频繁信道冲突是造成丢包的最重要原因。当误码率在10-3~10-4之间时,分片大小控制可以有效地提高传输性能。在分析无线mesh网络丢包原因的基础上,针对802.11无线mesh网络,提出了一种基于预测的链路层动态帧分片聚合方案PDFA。在信道误码率预测的基础上,优化了发送分片的大小。仿真实验验证了PDFA有效地提高了无线网状网络的传输性能。
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引用次数: 0
Design of an Exception Handing Algorithm of Workflow 一种工作流异常处理算法设计
Shaofei Wu, Bin Guo
The popularization of the Internet/Intranet applications and the development of Web technology provide a perfect foundation for the realization of the Web-based workflow management systems, It has been primary characteristic of new-style workflow management system that the Web technology is adopted. Demanded to work normally in general status, the system furthermore must have capability in handling all kinds of exceptions flexibly. The unexpected exceptions should be altered to a expected exception so that to be handled conveniently for the workflowpsilas finishing in normal ways although with exceptions. In order to enhance the performance of exception handling algorithm in workflow, a searching algorithm of exception handling in workflow with low time complexity and low space complexity is designed. The algorithm can add new handling rule into exception handing base and filter old rule to discard in rule base so that the performance and efficiency of exception handing can be enhanced.
Internet/Intranet应用的普及和Web技术的发展为基于Web的工作流管理系统的实现提供了完善的基础,采用Web技术已成为新型工作流管理系统的主要特点。系统要在一般情况下正常工作,还必须具有灵活处理各种异常的能力。意外异常应更改为预期异常,以便方便地处理工作流,使其以正常方式完成,尽管有异常。为了提高工作流异常处理算法的性能,设计了一种低时间复杂度和低空间复杂度的工作流异常处理搜索算法。该算法可以在异常处理库中增加新的处理规则,并在规则库中过滤掉旧规则,从而提高异常处理的性能和效率。
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引用次数: 1
期刊
2008 ISECS International Colloquium on Computing, Communication, Control, and Management
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