基于知识的制造业客户关系管理系统研究与实现

随着以客户为中心的竞争趋势的形成 ,客户关系管理系统的应用成为企业信息化建设的焦点。本文应用认知科学、数据仓库、智能决策分析等技术 ,并结合知识管理的先进思想 ,将知识转移和客户忠诚度智能分析等功能融入传统客户关系管理系统中 ,进而构建出适合制造业的基于知识的客户关系管理原型系统。     

扬琴自动演奏机器人机械臂设计

为促使我国民族乐器自动演奏机器人的进一步发展,设计一种能拟人化敲击的扬琴自动演奏机器人机械臂。根据D-H参数法建立机械臂的运动学模型并求得运动学方程的正解,利用反变换法求得机械臂运动学方程的逆解,从而验证运动学模型的正确性以及为机械臂运动控制提供理论基础。利用Solidworks三维建模软件建立机械臂的虚拟样机模型,对其进行运动过程仿真,仿真结果验证了机械臂结构及连杆参数设计的合理性。制作试验样机进行实验,进一步证明机械臂设计的可行性。为扬琴自动演奏机器人机械臂的后续研究提供了理论基础。     

Preprocessing noisy imbalanced datasets using SMOTE enhanced with fuzzy rough prototype selection

The Synthetic Minority Over Sampling TEchnique (SMOTE) is a widely used technique to balance imbalanced data. In this paper we focus on improving SMOTE in the presence of class noise. Many improvements of SMOTE have been proposed, mostly cleaning or improving the data after applying SMOTE. Our approach differs from these approaches by the fact that it cleans the data before applying SMOTE, such that the quality of the generated instances is better. After applying SMOTE we also carry out data cleaning, such that instances (original or introduced by SMOTE) that badly fit in the new dataset are also removed. To this goal we propose two prototype selection techniques both based on fuzzy rough set theory. The first fuzzy rough prototype selection algorithm removes noisy instances from the imbalanced dataset, the second cleans the data generated by SMOTE. An experimental evaluation shows that our method improves existing preprocessing methods for imbalanced classification, especially in the presence of noise.     

Accelerated microwave curing of concrete: A design and performance-related experiments

Microwave (MW)-accelerated curing has emerged as an innovative and popular curing method for concrete materials. This paper reports the results of a study to model the horn antenna used for the MW irradiation of a workpiece with a mobile MW-accelerated concrete curing unit, based on a coupled thermal and electromagnetic analysis. The mathematical models were useful for evaluating the heat generation within a horn antenna and as a basis for constructing a mobile MW-accelerated curing unit with an operating frequency of 2.45 GHz and a MW power level of 800 W. Further, the early-age compressive strength development and volume stability of MW-cured concrete were investigated in terms of its shrinkage and compared to the properties of autoclave-cured concrete. The design results showed that under the concept of the allowable maximum temperature for the concrete workpiece, which was controlled to less than 80 °C, a horn antenna that was 216.70 mm wide, 333.68 mm long, and 273.0 mm high produced a uniform thermal distribution in a concrete workpiece. Moreover, experimental investigations showed that the application period for curing using a mobile MW-curing unit was considerably shorter than that in autoclave curing methods. The appropriate delay time (time after concrete mixing) was 30 min, and MW irradiation for 45 min could improve the maximum 8-h early-age compressive strength of MW-cured concrete, whereas an application time of 15 min produced the 28-day compressive strength. When a concrete workpiece was cured at high temperature using MW energy for more than 15 min at a temperature greater than 80 °C, the effect was a continuous increase in the early-age compressive strength, which was greater than that achieved by autoclave curing. In terms of volumetric stability, MW-curing for 30 and 45 min increased the ultimate shrinkage to a greater extent than that by autoclave curing and vice versa in the case of a MW application time of 15 min.     

The fourth house: the design of a bioclimatic house in Venezuela

A new prototype, bioclimatic terraced (or row) house for Tamare, Venezuela is being developed to address contemporary Venezuelan urban problems of lot size, urban sprawl, urban dispersion and high energy consumption. The design is based upon principles from three previous vernacular house types in the Maracaibo Lake basin. The design of the high density bioclimate house is proposed with narrow frontage, two or three floors and an innovative interior space which is integrated into the building as a vertical patio to generate a ‘detached row building’. The resulting prototype is predicted to consume less energy and land resources while exploiting bioclimatic principles.

Un nouveau prototype: la maison à terrasses (ou rangées) bioclimatiques pour Tamare, au Venezuela a été développé pour faire face aux problèmes urbains vénézuéliens actuels que sont la dimension des parcelles, l'étendue et la dispersion des zones urbaines et la consommation élevée d'énergie. Le concept de base repose sur un principe de trois types de maisons anciennes de style régional typique du lac Maracaibo. Le projet de la maison à haute densité bioclimatique prévoit une façade étroite, deux ou trois étages et un espace innovateur intérieur qui est intégré dans le bâtiment comme une sorte de patio vertical afin de former un ‘bâtiment à rangée séparée’. Le prototype en résultant est prévu pour consommer moins d'énergie et de ressources naturelles grâce à l'exploitation des principes bioclimatiques.     

Possible application of biohydrogen technologies as electricity sources in Indonesian remote areas

A prototype system for hydrogen gas production from a biological system of facultative fermentation has been applied for electricity power supply. The prototype was designed for application in remote or isolated areas in Indonesia. The fermentation system, which was designed to be as simple as possible, includes the preparation of the microbial seed, the substrate material, the vessel and other required equipment, gas capture and purification, a converter, and transportation. The model experiment in the field undergoes several modifications depending on the biomass sources in the actual location, i.e., some areas have agroforestry, sugarcane, soy sauce and palm sugar wastes. The light intensity and temperature followed the natural conditions. The results indicated that a cultivation scale of 5–25 L per substrate does not affect the result, i.e., a hydrogen production of approximately 60–70% of the total gas produced. The hydrogen gas produced was converted into electricity sources to power fans and house lamps. However, the hydrogen power is not yet sustainable due to the batch fermentation system, the biomass supply and the local electrical system, which is conventional (not a grid system). We propose to merge the electrical system in those areas, i.e., combining the source of electrical power from wind, solar, biomass, ocean current and fossil fuel-based generators. The model of the electricity pool system is important for Indonesia because, geographically, Indonesia consists of more than seventeen thousand islands, where the electricity supply remains unstable.     

Reliability and management of isolated smart-grid with dual mode in remote places: Application in the scope of great energetic needs

Energy needs increases day by day in those areas of the world where the electrical distribution lines are not available. This situation limits the industrial and economic development of these areas as well as the establishment of the population, so that it facilitates the exodus and the uprooting of people. At the moment the electrical energy supply in remote areas is based on solutions with generator sets, consuming great amounts of fuel with a great environmental damage. The technological development of renewable energies and the new concepts for their management, make possible proposing off-grid generation solutions for providing great amount of energy with high quality and reliability. Along this paper, a smart-grid configuration is proposed which is developed with products of proved reliability and which uses renewable energies as main generation source. This configuration allows having “standard” grid services anywhere, without the need of connection to the traditional grid. Environmental, economic and operation benefits of using these technologies against traditional solutions are also presented in this paper. This proposed solution allows the economical development and exploitation of areas where due to the lack of energy or to the energy cost it has not been possible until now.     

Twin cylinder alpha stirling engine combined model and prototype redesign

This article shows the development of a twin cylinder alpha type Stirling engine model, as well as the redesign of a prototype, its manufacture and preliminary results. The mechanical model is coupled with a thermodynamic model which allows an analysis and comparison of the theoretical and experimental behavior of the machine and a better understanding of the whole process. On the other side, a prototype redesign is presented. Thermal circuit was improved in order to eliminate losses, reduce dead volumes and improve heat transfer to the working fluid. Modifications of the seal system and the pistons design are included as well. An equation for the sizing of the flywheel is developed and finally the results obtained in tests between the new and the previous design are compared.     

三自由度并联机构坐标测量机的样机研制

采用-平移两转动并联机构为主体结构,研制了一种三自由度解耦并联机构(P-R-R-P-R)-R⊕S-P-T坐标测量机。给出了并联测量机的一般设计步骤,对所选机型进行机械机构设计.对样机的研制进行了详细说明,总结了样机研制过程的经验和体会。