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2010 IEEE Education Engineering Conference, EDUCON 2010

作者： Ferreira, Andre Luis Andrejew Zaro, Milton Antônio Costa, Rodrigo Garrett Da Post Studies Program in Education and Information Technology Universidade Federal do Rio Grande do Sul UFRGS Porto Alegre-RS Brazil Mathematics and Statistics Department Universidade Federal de Pelotas UFPel Pelotas-RS Brazil

ISBN: (纸本)9781424465682

In this article, the authors propose an investigation of the learning process of the concepts and of the mathematical relations in the physical chemistry study of the gas, mapping an interdisciplinary teaching approach. The theoretical background of the research is based on the Theory of Meaningful Learning (ML) and on Gowin's Epistemology trying to relate events, facts and concepts with other elements of knowledge through the "see" heuristic. The research experiments are being conducted with chemistry graduating students at the Universidade Federal de Pelotas in Rio Grande do Sul, during one semester, but it is planned to extend the studies to the engineering courses. The tests to check the subsumers are based on some theoretical questions related to the mathematical concepts already mentioned. Preliminary results of the testing show arithmetic and algebraic disabilities in a percentage of the group, as only 60% of the students answered the tests correctly. Based on the answers analysis contextualized activities are proposed to enrich the mathematics application in chemistry with the objective of favoring the development of the subsumers needed to the comprehension of the PC phenomena studied. © 2010 IEEE.

关键词： Physical chemistry

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Height Estimation via Stereo Vision System for Unmanned Helicopter Autonomous Landing

Height Estimation via Stereo Vision System for Unmanned Heli...

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2010 International Symposium on Computer,Communication, Control and Automation

作者： Kuo-Hsien Hsia Shao-Fan Lien Juhng-Perng Su Department of Management Information System Far East University Graduate School of Engr.Sci.&Tech.(Doctoral Program) National Yunlin University of Science&Technology Department of Electrical Engineering National Yunlin University of Science&Technology Department of Information Technology Overseas Chinese University

ISBN: (纸本)9781424455652;9781424455669

Auto landing is a very important function of control in the development of autonomous unmanned *** this paper,the stereo vision system is proposed to provide the height information on landing control instead of global positioning system(GPS).GPS provided 3-axis information,but the height error of GPS is usually in meters,which is not accurate enough for *** stereo vision system provided a more accurate height information to correct the error of *** this paper,the stereo vision system is composed of two webcams and the variable baseline method is selected to increase the measurement *** results show that variable baseline method did increase the accuracy of the stereo vision system with the webcams,and that not only provided an authentic piece of height information but also provided another option of sensor for autonomous unmanned helicopter's auto landing control.

关键词： stereo vision system height estimation helicopter landing

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Partial response maximum likelihood sequence detector for a nonlinear magnetic recording channel

Partial response maximum likelihood sequence detector for a ...

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International Conference on System Science and Engineering (ICSSE)

作者： Tsai-Sheng Kao Chiu-Hsiung Chen Sheng-Chih Chen Sheng-Yun Hou Yuan-Chang Chang Xsing-Bang Chou Department of Electronic Engineering Hwa-Hsia College of Technology and Commerce Taipei Taiwan Department of Computer Science and Information Engineering China University of Technology Hsinchu Taiwan Graduate Program of Digital Content and Technologies Chengchi University Taiwan

The nonlinear effects of partial erasure and transition shift, however, often limit the performance attained by the partial response maximum likelihood (PRML) detector because of model mismatch. Conventionally, the nonlinear effects are either ignored or approximated by linearization technique. In the article, a PRML detector for the PR4 model including the nonlinear effects has been developed to improve the detector performance. The new representation is more accurate and the corresponding PRML detector has better performance without increasing the realization complexity. Computer simulation results show that the new representation outperforms the conventional ones due to the enhanced modeling capability. The method is also expected to be applied in the high order partial response channel.

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Design and fabrication of nanoscale antireflection structures with linearly graded refractive index

Design and fabrication of nanoscale antireflection structure...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Song, Young Min Jang, Sung Jun Choi, Hee Ju Yu, Jae Su Lee, Yong Tak Department of Information and Communications Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Department of Electronic Engineering Kyung Hee University 1 Seocheon-dong Giheung-gu Yongin-si Gyeonggi-do 446-701 Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of

ISBN: (纸本)9781424470334

We demonstrate nanoscale antireflection structures on GaAs substrate with linearly graded effective refractive index using a lenslike shape transfer for broadband light-absorbing device application. From reflectance calculation of cone- and parabola-shaped subwavelength grating (SWG) structures, it is found that the parabola shaped structures has lower mean reflectance compared to that of the cone shaped structures over a wide wavelength range. The fabricated SWG structures with parabola shape show the reflectance of below 5 % in a 300-1200 nm wavelength range. ©2010 IEEE.

关键词： Reflection

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Impedance measurement of normal and cancerous human breast cells using a microfluidic tunnel

Impedance measurement of normal and cancerous human breast c...

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IEEE SENSORS

作者： Giseok Kang Sung-Kil Lee Sung Keun Yoo Sung Yang Jong-Hyun Lee Graduate-program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea School of Information and Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju South Korea Gwangju Institute of Science and Technology Gwangju KR

In this paper, a novel microelectrical impedance spectroscopy (μEIS) with three-dimensional interdigitated electrodes (3D-IDE) is developed to differentiate normal and cancerous cells. The device utilizes a microfluidic tunnel structure, which forces cells to be squeezed. Thus, the enlarged contact area between cells and electrodes allows the device to measure the intrinsic electrical signal of the cells with a higher sensitivity than a noncontact case. The cell squeezing is realized by fabricating smaller microfluidic channel than cell size. The electrical impedances are measured through 3D-IDE. The device well distinguishes normal human breast cell (MCF-10A) and early-stage human breast cancer cell (MCF-7) with a phase difference of 1.42° at 500 kHz. The proposed device also features a high repeatability because the phase change is as small as 0.27° (which is sufficiently smaller than the phase difference between normal and cancer cell) before and after the each cell assay.

关键词： Impedance Electrodes Microfluidics Impedance measurement Breast cancer

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An Approach for Defining Digital Democracy Support based on ICT

An Approach for Defining Digital Democracy Support based on ...

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13th International Conference on Computer Supported Cooperative Work in Design

作者： Diirr, Bruna Araujo, Renata Cappelli, Claudia Department of Information Systems UNIRIO Brazil Graduate Program in Information Systems (PPGI) UNIRIO Brazil NP2Tec Research and Practice Group in Information Technology UNIRIO Brazil

ISBN: (纸本)9781424435340

This paper discusses the proposal for a systematic approach to computational support specification for Digital Democracy. The basis for this proposal is the definition of a model for Digital Democracy support through communication and information technology comprising three aspects: collaboration, transparency and memory. The paper presents an exploratory study which analyses the proposed model potential in the context of decision-making processes in a public organization.

关键词： digital democracy ICT collaboration transparency group memory

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Trust-building mechanisms and knowledge sharing in virtual communities

Trust-building mechanisms and knowledge sharing in virtual c...

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9th International Conference on Electronic Business, ICEB 2009

作者： Chang, Chun-Ming Yen, Chia-Hui Cheng, Hsiang-Lan Department of Tourism Information Aletheia University Taiwan Department and Graduate Program in International Business Ming Chuan University Taiwan National Kaohsiung First University of Science and Technology Taiwan

Although trust has received much intention in the virtual communities (VCs) literature, few studies have been conducted to examine how trust develops in VCs. Drawing from prior literature on trust and knowledge sharing, a research model for understanding the antecedents of trust and the role of trust in VCs is presented. Data was collected from 324 members of a technical virtual community to test the model. The results help in identifying how the factors fall into three trust-building mechanisms build trust in the context VCs. The study discusses the theoretical and managerial implications of this study and proposes several future research directions.

关键词： Virtual reality

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Contamination-free cell lysis microfluidic device using cell cross over

Contamination-free cell lysis microfluidic device using cell...

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13th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2009

作者： Mun, Byung Phil Jung, Seung Mo Yoon, Sang Youl Lee, Jong Hyun Yang, Sung School of Information and Mechatronics Gwangju Institute of Science and Technology Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Korea Republic of

ISBN: (纸本)9780979806421

Complicated and time-consuming cell purification processes prevent a micro cell lysis device from integrating with LOC (Lab-on-a-chip) or μ-TAS (μ-Total Analysis System) devices for cell analysis. In this paper, we present a microfluidic cell lysis device using a contamination-free cell cross over method in order to minimize the cell pretreatment procedure. © 2009 CBMS.

关键词： Microfluidics

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Responsiveness Improvement of Idling Speed Control for Automotive Using SMC

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Journal of Software Engineering and Applications 2009年第5期2卷 309-315页

作者： Yang ZHANG Nobuo KURIHARA Hiroyuki YAMAGUCHI Doctor of Science Program in Mechanical Systems Hachinohe Institute of Technology Graduate School of Engineering Hachinohe Institute of Technology Department of System and Information Hachinohe Institute of Technology

To improve the responsiveness of engine speed control to disturbances, robust controls were investigated by simulation. The intake air control system of a gasoline engine is a typical nonlinear system, and the disturbances and parameter perturbations are generally regarded as being the unstable factors with regard to engine control. In this paper, a Mean-Value Engine Model (MVEM) with disturbances and parameter perturbations is investigated using Sliding Mode Control (SMC), which is a form of variable structure control, with a view to address instability in the idle speed control process. The simulation results confirmed that, compared with a conventional PI (Proportional-Integral) controller, the stability of the idle speed for an engine that is being subjected to disturbances, parameter variations and background noise is greatly improved by the application of SMC.

关键词： Gasoline Engine Intake Air Control Sliding Mode Control Simulation

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An authenticated anonymous group key management with only one rekey message

An authenticated anonymous group key management with only on...

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5th IASTED European Conference on Internet and Multimedia Systems and Applications, EuroIMSA 2009

作者： Wuu, Lih-Chyau Hung, Chi-Hsiang Department of Computer Science and Information Engineering National Yunlin University of Science and Technology 123 University Road Touliu Yunlin Taiwan Graduate School of Engineering Science and Technology Doctoral Program National Yunlin University of Science and Technology 123 University Road Touliu Yunlin Taiwan

ISBN: (纸本)9780889868021

In Internet, IP multicast has been used successfully to provide an efficient, best-effort delivery service for group communication applications. However, applications such as multiparty private conference, distribution of stock market information, pay per view and other subscriber services require secure multicast to protect integrity and confidentiality of the group traffic, and validate group member's authenticity. Providing secure multicast for group communication is problematic without a robust group key management. In this paper, we propose an anonymous group key management with ID-based Signature and secret sharing technologies to distribute a new group key securely to each participant of a group with only one rekey message whenever the group membership changes. The key management guarantees that a legal user, without revealing his/her real identity, can join a group after finishing the mutual authentication with the group initiator, and enforces the forward secrecy and backward secrecy.

关键词： Multicasting

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