ZigBee中改进的Cluster-Tree路由算法

针对ZigBee网络的Cluster-Tree算法对簇首能量要求高、选择的路由非最佳路由等问题,结合节点能量分析和节点邻居表,提出一种改进的簇首生成方法,利用AODVjr算法为节点选择最佳路由。仿真结果证明,与原Cluster-Tree算法相比,改进的算法能有效提高数据发送成功率,减少源节点与目标节点间的跳数,降低端到端的报文传输时延,提高网络的使用价值。     

WSN中基于分簇的实时传输算法

采用跨层技术,提出一种无线传感器网络(WSN)中基于分簇的实时传输算法。在WSN中找出簇头到基站的多条优化路径,采用基于平均队列长度的拥塞控制方法,在这些路径中找出一条耗能最小且实时性最优的路径,并沿着该路径将数据传送到基站。仿真分析表明,该算法能满足网络的实时性需求,并能有效进行拥塞控制。     

Towards an ICT-based psychology: E-psychology

Cognitive science is the scientific domain which studies, analyzes, simulates and infers for various aspects, functions and procedures of human mentality such as, thinking, logic, language, knowledge, memory, learning, perception and the ability to solve problems. E-psychology is in close relation with the cognitive science domain, but expands beyond it, as e-psychology is the efficient convergence of psychology and Information and Communication Technologies (ICTs). E-psychology offers a number of services such as supporting, diagnosis, assessment, therapy, counseling, intervention and tests through an effective exploitation of ICTs. This article presents a user-friendly, flexible and adaptive electronic platform, which supports both synchronous and asynchronous e-psychology activities through the use of informative and communicative tools and services, which can be adapted to support various methods of e-psychology activities. It is important to underline that e-psychology is not an alternative psychology field, but a resource to enhance the conventional psychology process.     

Formal model for assigning human resources to teams in software projects

Context

Human resources play a critical role in software project success. However, people are still the least formalized factor in today’s process models. Generally, people are assigned to roles and project teams are formed on the basis of project leaders’ experience of people, constraints (e.g. availability) and skill requirements. Yet this process has to take multiple factors into account. Few works in the literature model this process. Most of these are informal proposals focusing on the individual assignment of people to project tasks and do not consider other aspects like team formation as a whole.

Objective

In this paper we formulate a formal model for assigning human resources to software project teams. Additionally, we describe the key results of the knowledge management process enacted to output the elements of the model.

Method

The model elements were identified using the Delphi expert consultation method and applying psychological tests. The proposed model was implemented in a software tool and validated on two software development organization assignment scenarios.

Results

We built a formal model for the process of assigning human resources to software project teams. This model takes into account as many factors as possible and aids the assignment of individuals to project roles, as well as the formation of the team as a whole.We found that the rules that were identified to form software development project teams are useful. From the tests we found that model implementation was feasible (all the executions of the implemented problem-solving algorithms output feasible solutions in response times that can be considered as acceptable).

Conclusion

Using the Delphi method we were able to propose software project roles and competences. Psychological tests and data mining tools identified useful rules for forming software project teams. These were used to build a formal model. This model was built into a tool that returns role assignments in acceptable response times. This decision support tool helps managers assign people to roles and to form teams. Using the tool, project leaders can flexibly evaluate different team make-ups, taking into account several factors, as well as different constraints and objectives.     

A bootstrap goodness of fit test for the generalized Pareto distribution

This paper proposes a bootstrap goodness of fit test for the Generalized Pareto distribution (GPd) with shape parameter γ. The proposed test is an intersection–union test which tests separately the cases of γ≥0 and γ<0 and rejects if both cases are rejected. If the test does not reject, then it is known whether the shape parameter γ is either positive or negative. A Monte Carlo simulation experiment was conducted to assess the power of performance of the intersection–union test. The GPd hypothesis was tested on a data set containing Mexico City’s ozone levels. ¹     

Peer-exchange schemes to handle mismatch in peer-to-peer systems

A self-organizing peer-to-peer system is built upon an application level overlay, whose topology is independent of an underlying physical network. A well-routed message path in such systems may result in a long delay and excessive traffic due to the mismatch between logical and physical networks. In order to solve this problem, we present a family of Peer-exchange Routing Optimization Protocols (PROP) to reconstruct the overlay. It includes two policies: PROP-G for generic condition and PROP-O for optimized one. Both theoretical analysis and simulation experiments show that these two protocols greatly reduce the average latency of the overlay and achieve a better logical topology with low overhead. Their overall performance can be further improved if combined with other recent approaches. Specifically, PROP-G can be easily applied to both structured and unstructured systems without the loss of their primary characteristics, such as efficient routing and anonymity. PROP-O, on the other hand, is more efficient, especially in a heterogenous environment where nodes have different processing capabilities.

A study on the use of statistical tests for experimentation with neural networks: Analysis of parametric test conditions and non-parametric tests

In this paper, we focus on the experimental analysis on the performance in artificial neural networks with the use of statistical tests on the classification task. Particularly, we have studied whether the sample of results from multiple trials obtained by conventional artificial neural networks and support vector machines checks the necessary conditions for being analyzed through parametrical tests. The study is conducted by considering three possibilities on classification experiments: random variation in the selection of test data, the selection of training data and internal randomness in the learning algorithm.The results obtained state that the fulfillment of these conditions are problem-dependent and indefinite, which justifies the need of using non-parametric statistics in the experimental analysis.     

HTML表格向XML的智能转换

XML已经成为处理与管理信息的标准格式,而HTML表格被广泛应用于Web。为了充分利用与管理HTML表格信息,需要将HTML表格转换成XML。提出一种有效的处理方法,该方法包含2个部分,即表格识别与结构转换。表格识别通过检查格式、语法及语义的特征将表格提取出来并分割成值域与属性域,使用预设的表格模板分析属性域与值域间的层次结构并将其转换成XML格式。通过 300多个表格的实验表明,所提出的方法要优于传统方法,结果的准确率达86.7%。     

某型飞机振动传感器试验器的研制

为测试某型飞机振动传感器性能,采用背靠背比较法振动测试方法,基于苏试振动台(VT-500)、功率放大器(LA-800)、单轴向电荷输出型加速度标准传感器(Ymc222A25)、电荷放大器(Ymc8102T)、普源信号发生器(DG1032Z)以及研华PCI工控机与A/D板卡(PCI-1716L),搭建振动传感器试验器振动测试平台,以DG1032Z输出作为振动激励信号源,基于VC ++6.0开发出信号发生器远程控制与板卡信号采集软件,对试验器的功能进行试验验证,结果表明其有效性.所研制的试验器可实现振动信号源的产生与标准/被测信号的校准,从而为某型飞机振动传感器的测试与修理提供技术支撑.     

基于Android手机应用的在线课程表查询

讲述Android手机应用开发实例.手机用户可通过查询,了解学校安排的课程信息,为师生提供了方便.