标记模态归结的推广

本文将作者提出的高效的命题模态Ｄ逻辑的标记模态归结方法推广到了命题模态逻辑Ｋ,Ｋ４,Ｄ４,Ｔ,Ｓ４系统,建立了上述命题模态逻辑的标记归结形式系统ＭＲＫ,ＭＲＫ４,ＭＲＤ４,ＭＲＴ,ＭＲＳ４,并用转移子句模式的方法,借助于标记模态归结对命题模态Ｄ逻辑的可靠性结果,证明了标记模态归结系统ＭＲＫ,ＭＲＫ４,ＭＲＤ４,ＭＭＲＴ,ＭＲＳ４分别关于命题模式逻辑Ｋ,Ｋ４、Ｄ４,Ｔ,Ｓ４的可靠性,进而得到了它们的     

MIPv4网络中的蠕虫传播模型

基于MIPv4网络环境,构建一种新型蠕虫——MIPv4-Worm,给出MIPv4节点接触频率的计算方法,对MIPv4网络中蠕虫的传播策略进行了分析和研究,建立MIPv4网络蠕虫传播模型(MWM)。该模型显示了各参数对蠕虫传播的影响。MIPv4-Worm传播的仿真实验表明,该模型较好地模拟了MIPv4网络中蠕虫的传播规律,为采取有效措施防止MIPv4中蠕虫的大范围传播提供了理论依据。     

The relationship between organizational culture and the deployment of agile methods

Context

Systems development normally takes place in a specific organizational context, including organizational culture. Previous research has identified organizational culture as a factor that potentially affects the deployment systems development methods.

Objective

The purpose is to analyze the relationship between organizational culture and the post-adoption deployment of agile methods.

Method

This study is a theory development exercise. Based on the Competing Values Model of organizational culture, the paper proposes a number of hypotheses about the relationship between organizational culture and the deployment of agile methods.

Results

Inspired by the agile methods thirteen new hypotheses are introduced and discussed. They have interesting implications, when contrasted with ad hoc development and with traditional systems development methods.

Conclusion

Because of the conceptual richness of organizational culture and the ambiguity of the concept of agility the relationship between organizational culture and the deployment of agile systems development forms a rich and interesting research topic. Recognizing that the Competing Values Model represents just one view of organizational culture, the paper introduces a number of alternative conceptions and identifies several interesting paths for future research into the relationship between organizational culture and agile methods deployment.     

Conceptual framework for business processes compositional verification

Context

To guarantee the success of Business Process Modelling (BPM) it is necessary to check whether the activities and tasks described by Business Processes (BPs) are sound and well coordinated.

Objective

This article describes and validates a Formal Compositional Verification Approach (FCVA) that uses a Model-Checking (MC) technique to specify and verify BPs.

Method

This is performed using the Communicating Sequential Processes +Time (CSP+T) process calculus, which adds new constructions to timed Business Process Model and Notation (BPMN) modelling entities for non- functional requirement specification.

Results

Using our proposal we are able to specify the BP Task Model (BPTM) associated with BPs by formalising the timed BPMN notational elements. The proposal also allows us to apply MC to BPTM verification. A real-life example of verifying a BPTM in the field of Customer Relationship Management (CRM) is discussed as a practical application of FCVA.

Conclusion

This approach facilitates the verification of complex BPs from independently verified local processes, and establishes a feasible way to use process calculi to verify BPs using state-of-the-art MC tools.     

RC4密码的改进方法及其性能分析

针对RC4密码技术在工程应用中存在的弱密钥和相关密钥攻击、不变性弱点、数据流偏向性弱点等安全问题,提出一种将ECC技术与RC4技术相结合的方法。对改进后的RC4的数据处理效率、密钥管理、安全性能进行研究和分析。改进后的RC4技术在保证与RC4数据处理效率相近的同时,对当前针对RC4流密码的密码分析方法具有一定的抗攻击性。该技术较好地解决了密钥的共享和更新问题,具有重要的工程应用意义。     

LiZnVO_4液相掺杂对Zn_2SnO_4材料感湿特性的影响

采用共沉淀法制备出Zn2SnO4 LiZnVO4系纳米粉体,考察了液相掺杂时LiZnVO4添加量对材料显微结构、导电类型以及湿敏性能的影响。实验结果表明,适当的LiZnVO4添加量可明显改善纳米材料的感湿特性。采用共沉淀法制备纳米粉体并使LiZnVO4液相掺杂量为0.1mol的配比,可使Zn2SnO4材料具有低湿电阻小、灵敏度适中的湿敏特性。     

互操作性测试研究——BGP4+测试

针对面向IPv6的边界网关协议BGP4+进行了互操作性测试研究。讨论了BGP4+与BGP4的区别,给出了BGP4+协议测试的有限状态机模型。运用形式化与非形式化相结合的方法生成了BGP4+的测试例,并给出了运用测试例对具体的协议实现测试的结果。     

RFID-initiated workflow control to facilitate patient safety and utilization efficiency in operation theater

Objective

To control the workflow for surgical patients, we in-cooperate radio-frequency identification (RFID) technology to develop a Patient Advancement Monitoring System (PAMS) in operation theater.

Methods

The web-based PAMS is designed to monitor the whole workflow for the handling of surgical patients. The system integrates multiple data entry ports Across the multi-functional surgical teams. Data are entered into the system through RFID, bar code, palm digital assistance (PDA), ultra-mobile personal computer (UMPC), or traditional keyboard at designated checkpoints. Active radio-frequency identification (RFID) tag can initiate data demonstration on the computer screens upon a patient's arrival at any particular checkpoint along the advancement pathway.

Results

The PAMS can manage the progress of operations, patient localization, identity verification, and peri-operative care. The workflow monitoring provides caregivers’ instant information sharing to enhance management efficiency.

Conclusion

RFID-initiate surgical workflow control is valuable to meet the safety, quality, efficiency requirements in operation theater.     

4-X-N-Y-6-氮杂雄-4-烯-3-酮衍生物对3BHSD的抑制活性与结构关系研究

应用分子力学方法MM 和半经验量子化学AM1法得到了17种4-X-N-Y-6-氮杂雄-4-烯-3-酮衍生物的优势构象，再利用量子化学算法和分子图形学技术获得电子结构参数和几何结构参数，采用多元线性回归分析和人工神经网络误差反传算法(BP)，将这些参数和4-X-N-Y-6-氮杂雄-4-烯-3-酮衍生物对3β-羟类固醇脱氢酶(3BHSD)的抑制活性相关联。结果表明，4-X-N-Y-6-氮杂雄-4-烯-3-酮衍生物对3BHSD的抑制活性大小和分子范德华体积(V)、分子最高占用轨道能(EHOMO)及9号碳原子的净电荷(Q)的相关性较好，成功地建立了17种4-X-N-Y-6-氮杂雄-4-烯-3-酮衍生物的构效关系式。HOMO轨道组成分析表明，A环上的4号、5号碳原子和羰基氧原子(O18)及B环上的7号、8号碳原子和6号氮原子可能是与受体作用时的活性位点。     

Endohedral complex of fullerene C60 with tetrahedrane, C4H4@C60

B3LYP/6-31G(d) hybrid HF/DFT calculations were carried out to determine the structural and electronic properties of the endohedral complex of C60 with tetrahedrane C4H4. It was demonstrated that C4H4 was seated in the center of the C60 cage and existed in a molecular form inside the fullerene. The formation of this complex was endothermic with inclusion energy of 141.05 kcal/mol. C4H4 endohedral doping slightly perturbed the molecular orbitals of C60. The calculated HOMO-LUMO gaps, the electron affinity(EA) and the ionizational potential (IP) indicated that C4H4@C60 seemed to be more kinetically reactive than C60. The IR active modes and harmonic vibrational frequencies of C4H4@C60 were also discussed.     

Taking context into account in conceptual models using a Model Driven Engineering approach

Context

In public transport, travelers (considered as information systems users) do not have the same objectives and/or concerns at the same time. For this reason it is not always easy to provide them with the right information at the right time. If personalizing the information to the user allows to do this to some extend it is not enough since the information could also depend on the use of the context and the environment (e.g., place, time, etc.).

Objective

This paper proposes a solution allowing the context to be managed inside an application’s conceptual models in order to provide more flexible web applications from the user’s point of view.

Method

Our work is based on a modeling method using the Model Driven Engineering (MDE) approach and on practical field experiences permitting us to validate our solution. Our domain of application is personalized transport information.

Results

Introducing the notion of context into rules and decision trees that are used inside conceptual models allowed us to incorporate context as important information for personalizing web applications.

Conclusion

The context should be integrated into an application during the modeling phase to allow a smooth integration inside the application and to facilitate the evolution over time. Our solution offers a better user’s experience through an extended personalization of web applications.     

PKR-inhibitor binds efficiently with human microtubule affinity-regulating kinase 4

MAP/microtubule affinity-regulating kinase 4 (MARK4) plays a central role in the cellular physiology, and it is inseparably linked with many human diseases including cancer, diet induced obesity, type2 diabetes and neurodegenerative disorders. Here, we studied the interaction of PKR-inhibitor with two variants of human MARK4. One variant is named as MARK4-F1 which has 59 N-terminal residues along with kinase domain while another variant is MARK4-F2 which has kinase domain only. Molecular-docking, molecular dynamics (MD) simulation and fluorescence-binding studies were undertaken to understand the role of N-terminal 59-residues in the binding of substrate/inhibitors. Molecular docking studies revealed that the PKR-inhibitor binds in the large hydrophobic cavity of the kinase domain of MARK4 through several hydrophobic and hydrogen-bonded interactions. Furthermore, MD simulation showed a stable parameters for the complexes of both MARK4-F1 and MARK4-F2 to PKR-inhibitor with marginal difference in their binding affinities. A significant decrease in the fluorescence intensity of MARK4 was observed on successive addition of the PKR-inhibitor. Using fluorescence data we have calculated the binding-affinity and the number of binding site of PKR-inhibitor to the MARK4. A significantly high binding affinity was observed for the PKR-inhibitor to the MARK4 variants. However, there is no any significant difference in the binding affinity of PKR-inhibitor to the MARK4 variants was observed, indicating that 59 N-terminal residues of MARK4-F1 are not playing a crucial role in the ligand binding. The present study will provide an insights into designing of new PKR-inhibitor derivative as potent and selective therapeutic agent against many life threatening diseases which are associated with MARK4.     

Efficient method of adaptive sign detection for 4×4 determinants using a standard arithmetic processing unit

We propose an efficient and exact method for the adaptive sign detection of 4×4 determinants using a standard arithmetic unit. The entities of determinants are variable length integers (integers of arbitrary bit length). The integers are expressed in 16-bit data units, and the sign detection is reduced to the computation of 4×4 determinants of 16-bit integers. To accelerate the computation, the calculation is performed by using a standard arithmetic unit. We have implemented our method and confirmed that it significantly improves the computation time of 4×4 determinants. The method can be applicable to many geometric algorithms that need the exact sign evaluation of 4×4 determinants, especially to construct robust geometric algorithms.     

Theoretical foundations for the 4×4 determinant method in computer graphics and geometric modelling

Theories of the 4×4 determinant method to resolve interference problems are described, in detail, in succession to the former paper [1]. First, various cases of the 4×4 determinant are discussed including the geometric implications by deriving a few fundamental relations. Secondly, normalization of the determinant is proposed. Thirdly, an intersection formula in homogeneous coordinates is verified which makes it possible to do consistent homogenous coordinate processing from the very beginning of geometric modelling to the very last of the objects displayed. Lastly an outline of how the 4×4 determinant method is applied to basic geometric problems is described.This article will provide, theoretical foundations for the 4×4 determinant method in computer graphics and geometric modelling.     

A New Paradigm for Geometric Processing

A new paradigm for geometric processing is proposed. The paradigm can be featured by the four key phrases: (1) Totally Four Dimensional Homogeneous Processing, (2) 4 × 4 Matrix Method and 4 × 4 Determinant Method, (3) Integer Arithmetic with Adaptive Data-Length Control Technique, (4) Systematic Paradigm Structures Based on the Duality.     

基于SoT的BGP4+协议一致性测试系统设计

底层网络协议由IPv4向IPv6的过渡,导致原先运行于IPv4上的应用层协议也需要做适当的修改或补充,BGP4+协议就是为了适应这种变化而由原来的基于IPv4的BGP4协议修改而成。针对修改后的协议,需要设计新的BGP4+协议一致性测试系统。本文首先介绍了BGP4协议的特点和一致性测试的概念,提出了对测试集形式化描述的改进,并在此基础上详细阐述了BGP4+协议一致性系统的架构和设计方法。     

指挥自动化系统仿真模型的描述与实现

指挥自动化系统是打赢高技术战争的关键。对指挥自动化系统进行作战效能评估具有重大意义。指挥自动化系统效能仿真与评估将系统、信息、仿真三者有机结合，以指挥自动化系统的支持能力为中心。该文主要研究其中的仿真模型，采用UML中的类图与对象图对指挥自动化系统仿真模型进行描述，并利用C 语言实现了模型描述。     

BGP4＋互操作性测试研究

BGP4是最主要的域间路由协议,BGP4 是对BGP4进行扩展之后支持IPv6的,对于它的互操作性测试很重要.本文首先介绍了互操作性测试的目的,分析了BGP4以及BGP4 的功能、路由类型以及数据包种类.根据BGP4的说明生成了协议的输入输出有限状态机,基于该模型生成了部分BGP4 的互操作性测试套.然后对于协议的不同实现进行了互操作性测试设计与实践,最后给出了结论以及下一步的研究工作.     

4G移动通信技术的研究

在还没有完全享受3G移动通信系统商所带来服务的同时,4G移动通信技术的研究已经在逐步的进行着。该文简要分析了:(1)4G的网络结构;(2)4G的关键技术,如OFDM,软件无线电,智能天线技术,MIMO技术。(3)比较了3G和4G不同指标,分析了3G和4G采用的不同技术。(4)初步探讨了4G的现状和发展。