Strategies for adding features to CAD models in order to optimize performance

This paper presents an approach which enables new parameters to be added to a CAD model for optimization purposes. It aims to remove a common roadblock to CAD based optimization, where the parameterization of the model does not offer the shape sufficient flexibility for a truly optimized shape to be created. A technique has been developed which uses adjoint based sensitivity maps to predict the sensitivity of performance to the addition to a model of four different feature types, allowing the feature providing the greatest benefit to be selected. The optimum position to add the feature is also discussed. It is anticipated that the approach could be used to iteratively add features to a model, providing greater flexibility to the shape of the model, and allowing the newly-added parameters to be used as design variables in a subsequent shape optimization.     

基于状态表决的大规模数据库在线更新算法

目前,数据库为了保证运行安全需要进行在线更新,由于大量的数据要在短时间之内完成加载,那么计算机很难直接对其表决。针对这种问题,我们提出针对数据库的实时状态表决,而不是对数据库直接表决,并基于这种表决方法设计出相应的算法,有效解决数据量过大的问题。     

电话自动监控瓦斯报警器研究与开发

新型电话自动监控瓦斯报警器是在固定式瓦斯报警器的基础上开发研制出来的。它具有在瓦斯浓度超限时进行声光报警功能，同时还具有电话自动监控功能。使煤矿安全官员对基层煤矿负责人、安监员、矿主等人员的失职行为进行监管，避免人为因素造成的瓦斯爆炸事故发生。该文介绍了新型电话自动监控瓦斯报警器的组成结构，对其工作原理进行了详细的分析。     

Virtual surfaces and the influence of cues to surface shape on grasp

This research compared grasps to real surfaces with grasps to virtual surfaces, and used virtual surfaces to examine the role of cues to surface shape in grasp. The first experiment investigated the kinematics of overhand grasps to real and virtual objects. The results showed that, compared with grasps to real surfaces, grasps to virtual objects were different in the deceleration phase of the grasp movement and were more variable in their endpoint position. The second experiment used several measures to examine the relationship between the visual perception of a surface and the decision to grasp the surface with either an over-or underhand grasp. It was found that visual perception of the surface was consistent with the grasping decision. The third experiment used virtual surfaces to examine how the removal of visual cues to shape affected the decision to switch from over- to underhand grasp. Results showed that the orientation at which the decision switched was dependent on the visual information content. Overall, the results showed that subtle differences existed between the reach to grasp movements towards real and virtual surfaces and that the decision to choose between grasp types was dependent on the visual information used to depict the virtual surface. These results are discussed in relation to the design and use of input devices to enable manipulation of three-dimensional objects in virtual worlds.     

应用S7-300 PLC实现混凝土养护过程中温度量的模糊控制

养护是混凝土制品生产的一个重要环节,根据养护过程中温度变化过程的专家经验和模糊控制理论为设计依据,应用西门子S7—300PLC控制设备,实现养护过程温度变化过程的合理控制。对目前高效的蒸汽养护混凝土方式的温度量控制进行了探索与应用,在实践中证实了这种养护方式的良好性能。     

金属切削过程中的稳定性分析

本文对于金属切削这一生产过程中所出现的不稳定问题,利用频率特性法中的奈氏判据,对其进行分析,从而找出消除自激振荡和达到切削过程绝对稳定的条件     

微机监测与铁道信号设备安全

目前我们铁路运输事业快速发展,全国各地都新建了高铁铁路。速度是提升了,安全问题也不能忽视。列车在运行过程中要想保证安全,就需要铁道各处的信号信息正确。控制台通过相关的信号设备将运行的指令传递给列车,以保证铁路的整体运行情况。在新的时期,需要能够全天候检测铁路安全的方法,以便维修人员能够及时了解问题并处理。本文通过对TJWX-2006型信号设备监测系统进行研究,来分析在铁路上使用微机来检测铁路的运行情况。这对研究信号设备安全有着积极的意义。     

低碳经济时代的建筑之道

低碳建筑是营造可持续发展未来的关键。本文通过对低碳建筑的全面分析以及对全球知名的设计实例的分析,探讨适应低碳经济时代的建筑发展的方向、目标,指出低碳建设和设计要走向集约型、走向自然、走向效率设计、走向适应性设计、走向循环设计、走向智能化设的发展途径,以及低碳建筑未来的发展方向。     

Holarchy formation and optimization in holonic manufacturing systems with contract net

Holonic manufacturing systems (HMS) is based on the notion of holon, an autonomous, cooperative and intelligent entity to provide a econfigurable, flexible and decentralized manufacturing environment to respond to changing needs and opportunities. A set of holons that cooperate to achieve a goal forms a holarchy. How to design a mechanism to form a holarchy to achieve a goal while minimizing the overall cost is a challenge. The objectives of this paper are to propose models and develop collaborative algorithms to guide the holons to form a holarchy to coherently move toward the desired goal state ultimately. We adopt contract net protocol (CNP) to model mutual selection of holons in forming a holarchy. We formulate a holarchy optimization problem to minimize the cost subject to the feasibility constraints. To analyze the feasibility of a holarchy, a Petri net (PN) model is proposed. As classical PN models do not take into account the cost involved in firing transitions, we augment the PN model with cost functions in the problem formulation. Due to the distributed architecture of HMS, the internal structure of each potential holarchy that acts as bidder in CNP is not available to the manager. A key issue is to determine the feasibility of a holarchy without constructing the whole PN model of the given hierarchy. We study the feasible conditions for a holarchy and propose a collaborative algorithm to analyze the feasibility and award contracts to holons without constructing the whole model of a holarchy.     

电力电子理实一体化教育模式探析

电力电子技术这门学科的主要内容就是使用电子元件进行控制、变换电能。高等职业学校学生学习本课程的目的就在于站在运用的角度上对电力电子器件的工作性能有了较深的了解,然后运用所学知识对电力电子的主要内容能够进行透彻的解析。将理实一体化教育模式运用到电力电子这门学科上,不但能够使学生获得扎实的理论知识,而且可以通过实训室的相关设备对电力电子器件进行实践操作,进而加深对相关知识的理解,为学好这门科目奠定坚实的基础。     

自组织映射(SOM)型神经网络的实现

文章讨论了应用于自组织映射型神经网络的训练算法,该算法通过计算获胜神经元来找到最接近输入模式的节点,然后通过对网络连接权值的自组织,训练一个自组织竞争的神经网络,该网络通过一组输入数据可自行训练形成一个神经网络模型.     

图像定尺在钢铁板坯二次切割中的应用

简单介绍利用摄像头进行图像采集后，通过对图像信号进行处理．实现非接触式板坯长度测量，并依据测量结果，驱动切割设备自动定住，实现连铸钢坯的高精度自动定尺切割。     

Naturalistic decision-making in expert badminton players

This paper reports on a study of naturalistic decision-making in expert badminton players. These decisions are frequently taken under time-pressured conditions, yet normally lead to successful performance. Two male badminton teams participated in this study. Self-confrontation interviews were used to collect data. Inductive data analysis revealed three types of intentions during a rally: to maintain the rally; to take the advantage; and to finish the point. It also revealed eight types of decision taken in this situation: to ensure an action; to observe the opponent's response to an action; to realize a limited choice; to influence the opponent's decision; to put pressure on an opponent; to surprise the opponent; to reproduce an efficient action; and to play wide. A frequent decision was to put pressure on the opponent. Different information and knowledge was linked to specific decisions. The results are discussed in relation to research that has considered naturalistic decision-making.     

Naturalistic decision-making in expert badminton players

This paper reports on a study of naturalistic decision-making in expert badminton players. These decisions are frequently taken under time-pressured conditions, yet normally lead to successful performance. Two male badminton teams participated in this study. Self-confrontation interviews were used to collect data. Inductive data analysis revealed three types of intentions during a rally: to maintain the rally; to take the advantage; and to finish the point. It also revealed eight types of decision taken in this situation: to ensure an action; to observe the opponent's response to an action; to realize a limited choice; to influence the opponent's decision; to put pressure on an opponent; to surprise the opponent; to reproduce an efficient action; and to play wide. A frequent decision was to put pressure on the opponent. Different information and knowledge was linked to specific decisions. The results are discussed in relation to research that has considered naturalistic decision-making.     

电大计算机课程教学创新若干问题探讨

本文首先讨论了提倡精讲多练,留给学生自行探索的空间,接着分析了不断优化教师的教学方法﹑讲解概念善用类比、实行以"教"为辅,"学"为主的方式,最后研究了考核的形式多样化和对学生进行分层教学。因此本文具有深刻的理论意义和广泛的实际应用。     

散列节点网络成图方法分析研究

网络管理就是维护一个网络系统的正常运行,其中给人最直观的呈现就是网络拓扑图。网络拓扑图的绘制方法有很多种,目前广泛采用的方法有基于ICMP、ARP和SNMP协议的拓扑算法,其中以基于SNMP协议的拓扑算法最为主流。对于任意网络中的散列节点如何不依赖于特定协议而自发的进行拓扑图绘制,这在各种小型网络建设中是非常重要的。本文将根据一个实例,对散列节点网络成图方法进行研究与分析。除了研究得到拓扑图的方法外还将对最终成图结果如何与实际相符合做出讨论。     

大数据环境下我国被遗忘权之立法构建——欧盟《一般数据保护条例》被遗忘权之借鉴

在记忆成为常态,而遗忘成为例外的大数据时代,欧盟数据改革提出的“被遗忘和删除权”备受各方关注和争议.本文通过探讨被遗忘权对个人信息保护的重要意义,研究欧盟《一般数据保护条例》草案中“被遗忘和删除权”的具体内容,分析我国现阶段删除权的法律现状及缺陷,提出大数据环境下我国被遗忘权的立法构建,以期提高个人信息在线环境的安全性.     

Numerical Treatment of the Loss of Hyperbolicity of?the?Two-Layer Shallow-Water System

This article is devoted to the numerical solution of the inviscid two-layer shallow water system. This system may lose the hyperbolic character when the shear between the layer is big enough. This loss of hyperbolicity is related to the appearance of shear instabilities that leads, in real flows, to intense mixing of the two layers that the model is not able to simulate. The strategy here is to add some extra friction terms, which are supposed to parameterize the loss of mechanical energy due to mixing, to get rid of this difficulty. The main goal is to introduce a technique allowing one to add locally and automatically an ??optimal?? amount of shear stress to make the flow to remain in the hyperbolicity region. To do this, first an easy criterium to check the hyperbolicity of the system for a given state is proposed and checked. Next, we introduce a predictor/corrector strategy. In the predictor stage, a numerical scheme is applied to the system without extra friction. In the second stage, a discrete semi-implicit linear friction law is applied at any cell in which the predicted states are not in the hyperbolicity region. The coefficient of this law is calculated so that the predicted states are driven to the boundary of the hyperbolicity region according to the proposed criterium. The numerical scheme to be used at the first stage has to be able to advance in time in presence of complex eigenvalues: we propose here a family of path-conservative numerical scheme having this property. Finally, some numerical tests have been performed to assess the efficiency of the proposed strategy.     

Activity-based justification of IT investments

Ever since investments in IT moved from operational to decision support, academics and practitioners have been looking for ways to justify the costs. Traditional approaches, such as NPV, have been shown inadequate in capturing qualitative and quantitative benefits, and techniques developed to address the issue have proved limited in their ability to link investment justification with impact assessment. Recent literature has called for the use of business processes to assess the impact of IT and the same processes can be used to justify investments in IT. The activity-based costing (ABC) approaches in the field of accounting were developed to relate investments to product profitability by allocating the burden to those that receive the most benefit. Thus, this paper uses the ABC approach to relate investments to activities, so that it can be used to justify IT investment. The paper provides a model to determine when the approach, referred to as activity-based justification, is most appropriate and its value is illustrated using a case study.