Using Semantic Web Technologies to Analyze Learning Content

The authors demonstrate how to use semantic Web technologies to improve the state-of-the-art in online learning environments and bridge the gap between students on the one hand, and authors or teachers on the other. The ontological framework presented here helps formalize learning object context as a complex interplay of different learning-related elements and shows how we can use semantic annotation to interrelate diverse learning artifacts. On top of this framework, the authors implemented several feedback channels for educators to improve the delivery of future Web-based courses.     

A tutorial on biomedical process control

This paper presents a tutorial on five typical applications within the area of biomedical process control. The specific applications discussed include: control of insulin administration for treating diabetes mellitus, dynamic modeling for anti-cancer chemotherapy regimen design, modeling and control of drug infusion in critical care, structured treatment interruptions: a control mathematical approach to AIDS protocol design, and dynamic modeling and control of the anticoagulant drug heparin. The objective of the tutorial is to illustrate the rich and important set of problems within the biomedical area that process control engineers can contribute to solving. Solution to these problems can have a significant medical as well as economic impact.     

分析泄漏功率攻击采用90nm CMOS技术的加密器件

在电子商务与电子银行等应用中,安全要求越来越严格.虽然加密技术提供了强健的算法,但这些算法的物理实现一般会通过器件电气运行中的物理现象,泄漏一些信息,攻击者会利用它来探测密钥.     

Single-stage input-current-shaping technique withvoltage-doubler-rectifier front end

In this paper, a new single-stage input-current-shaping (S² ICS) technique that integrates the voltage-doubler-rectifier front end with a DC/DC output stage is introduced. Due to the voltage-doubler-rectifier front end, a reduction of line-current harmonics can be achieved with a higher conversion efficiency compared to the corresponding S²ICS circuit with the conventional wide-range full-bridge rectifier. The proposed technique requires energy-storage capacitors with the same total capacitance and with half of the voltage rating as in the conventional S²ICS counterpart, which reduces the size and cost of the power supply. The performance of the proposed technique is evaluated on a 450 W (5 V/90 A) experimental prototype circuit     

Fostering scholarly productivity through academic and internship research training environments.

How can training programs foster counseling and clinical psychologists' scholarly productivity? This study examined the impact of academic and internship research training environments (RTEs) on the scholarly activity of 223 early career professionals. Results supported the construct validity of the Internship Research Training Environment scale through cross-validation and confirmatory factor analysis. Findings revealed differences in perceptions of the internship RTE and scholarly productivity as a function of academic training philosophy and internship training philosophy. Finally, results suggested that academic and internship RTEs could influence research interest and scholarly productivity indirectly by enhancing research self-efficacy and research outcome expectations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

New Universal All-Digital CPM Modulator

In this paper a new modulator for a broad class of continuous phase modulations (CPM) is proposed that is more flexible and less complex than conventional quadrature modulators, while achieving the same or better performance. Being all-digital it is more suitable for one-chip VLSI implementation. Some design parameters are also discussed and experimental results are presented.     

Remaining life management systems: from stand-alone to corporate memory systems and Internet (ALIAS system of MPA Stuttgart)

This paper describes an innovative and advanced system for remaining life assessment of industrial high-temperature components developed at MPA Stuttgart, Germany and being currently introduced into the power plants in Germany and several other countries. The system is a corporate memory system, essentially meaning that all the information/knowledge of a corporation (company, institute, etc.) should be maximally exploited in future activities of the company, with minimum changes in the existing structure of the data/information/knowledge already available. The system has two main aspects of practical implementation: (1) the organizational one, represented by MPA LifeTech; and (2) the software system one represented by the ‘parent systems’ WISDOM and ALIAS for the management of information and application of related tasks.     

Modeling Irrigation with Gypsiferous Mine Water: A Case Study in Botswana

The possible use of mine effluent for irrigation of agricultural crops was investigated for BCL Ltd. nickel mine (Selebi Phikwe, Botswana). The aims were to estimate the long-term water and salt balance under irrigation with gypsiferous mine water, as well as to make recommendations on cropping and management options. A simple but mechanistic edynamic soil water-salt balance generic crop growth model (SWB, Soil Water Balance) and a weather data generator (CLIMGEN) were used for long-term predictions. Eleven years of irrigation with BCL effluent were simulated for different cropping systems and irrigation management practices, followed by 39 years of irrigation with freshwater or dry land cropping. The long-term simulations indicated that between 661 and 2017 mm of mine effluent could be used annually through irrigation, depending on crop choice and irrigation management. Between 18% and 32% ot the total amount of salt added through irrigation was predicted to leach in 11 years, the remainder being precipitated in the 1.1 m deep soil profile in the form of gypsum. The rate of gypsum dissolution and leaching after 11 years of irrigation with mine water depended on management. Simulated root density-weighted electrical conductivities at saturation indicated favorable conditions for growth of summer crops, but a leaching fraction is recommended in winter. A lucerne perennial pasture was the most suitable cropping system from the point of view of mine water utilization and salt precipitation in the soil profile. Deficit irrigation (room for rain) followed by dry land cropping was the most suitable management strategy in order to limit salt leaching and possible ground water contamination. The acceptability of the proposed strategies will depend on Botswana's standards for environmental protection, as well as social and economic issues.     

Small-signal analysis and control design of isolated power supplies with optocoupler feedback

Optocouplers are widely used in isolated power supplies to transfer the feedback signal from the secondary to the primary side. In many power supplies, the feedback amplifier is supplied from the output voltage that creates additional feedback path which should be taken into account in the control design. The paper presents a detailed analysis and control design for each of the two possible feedback loops that can be identified. In addition, dynamic limitations of the TL431 shunt regulator and of the optocoupler are discussed. Practical guidelines for the error amplifier design and a design example are presented for both voltage-mode and current-mode controls.