• Solar Energy
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• v.13 no.2_3
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• pp.140-150
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• 1993

This paper describes technical details of Separate Excitation Inverter(SEI) application for the photovoltaic system. Depending on the output characteristics of solar cell modules, optimum control for the maximum electricity generation of photovoltaic system could be determined. New control mechanism of Separate Excitation Inverter for the Photovoltaic-Diesel Hybrid Generator was tested and examined. Results of this paper describe that maximum out of solar cell array could be obtained at two points. Therefore the two point control method was applied and verified between, the theory and the experiment.

• Journal of the Society of Naval Architects of Korea
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• v.43 no.2 s.146
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• pp.171-176
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• 2006

To improve ship's maneuverability high lift rudders like as Schilling rudder, flap rudder etc. were used. To predict the maneuverability of a ship with flap rudder HPMM tests are carried out. To analyze the test results modular model is used. To use modular model the forces of flap rudder must be measured separately from the hull forces. The flap rudder is made as independent system from the hull. To investigate the simulation results of modular model the tests results are analyzed by whole ship model, and simulated. The compared results of simulation show a good agreement except turning test. The reason is the different analysis result of flap rudder drag forces. From the present study it is possible to analyze HPMM tests of a ship with flap rudder by modular model.

• Journal of Intelligence and Information Systems
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• v.11 no.3
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• pp.117-127
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• 2005

Proportionately with a rapid development of mobile instrument technology, the number of mobile contents utilizing computing environment's graphic technology or image processing is increasing. In this paper, I designed a middleware which supports facial detection and recognition system based WIPI(Wireless Internet Platform for Interoperability), the Korean standard mobile platform. The facial recognition middleware introduced the object oriented concepts, to apply to recognition security and other contents by using mobile camera. This can reduce the development time and cost by dividing process while developing software. Therefore, it would be applied to content security or technology transfer with other company. Facial recognition middleware system is composed of face detection module and face recognition module, and proposes the application contents design method based on WIPI platform.

• The Journal of the Korea Contents Association
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• v.20 no.5
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• pp.236-242
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• 2020

Big data technology has been rising as a leading technology in the healthcare paradigm. As a world-class big data nation including National Health Insurance data, Korea has been focused on health policies and sustainability through database forecasting and policy establishment. So the need for education of big data by public officials in healthcare sector is increasing. However, there has not yet been National Competency Standards(NCS) or education modules, in this study, healthcare big data education module and content have been developed for the public servants with confidence.

• The KIPS Transactions:PartA
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• v.10A no.1
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• pp.15-24
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• 2003

In this paper, an optimization model for the clustered node allocation systems in the distributed computing environment is presented. In the presented model with a distributed file system framework, the dynamics of system behavior over times is carefully thought over the nodes and hence the functionality of the cluster monitor node to check the feasibility of the current set of clustered node allocation is given. The cluster monitor node of the node allocation system capable of distributing the parallel modules to clustered nodes provides a good allocation solution using Genetic Algorithms (GA). As a part of the experimental studies, the solution quality and computation time effects of varying GA experimental parameters, such as the encoding scheme, the genetic operators (crossover, mutations), the population size, and the number of node modules, and the comparative findings are presented.

• Spatial Information Research
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• v.21 no.3
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• pp.45-53
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• 2013

Web GIS, based on the latest web-technology, has evolved to provide efficient and accurate spatial information to users. Furthermore, Web GIS Server has improved the performance constantly to respond user web requests and to offer spatial information service. This research aims to create a designed and implemented Web GIS Server that is named as Nodemap which uses the emergent technology, Node.js, which has been issued for an event-oriented, non-blocking I/O model framework for coding JavaScript on the server development. Basically, NodeMap is Web GIS Server that supports OGC implementation specification. It is designed to process GIS data by using DBMS, which supports spatial index and standard spatial query function. And NodeMap uses Node-Canvas module supported HTML5 canvas to render spatial information on tile map. Lastly, NodeMap uses Express module based connect module framework. NodaMap performance demonstration confirmed a possibility of applying Node.js as a (next/future) Web GIS Server development technology through the benchmarking. Having completed its quality test of NodeMap, this study has shown the compatibility and potential for Node.js as a Web GIS server development technology, and has shown the bright future of internet GIS service.

• 대한공업교육학회지
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• v.34 no.1
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• pp.155-170
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• 2009

This study aims at examining text contents and its writing directions and analyzing their validity to develop text books of "invention and problem solving", which will be used for advanced courses of specialized high school of invention and patents. To develop text book contents and writing direction, literature research and professional association meetings were performed and to verify validity on developed text book contents and writing direction, survey research was performed. The subjects of survey research to verify validity consist of seventy five teachers who participated in the training course for invention leaders hosted by International Intellectual Property Training Institute (IIPTI) of Korean Intellectual Property Office (KIPO). To examine validity on text writing directions, each area of the text, themes, and modules, questionnaires that consist of multiple choice questions, and open questions that participants can describe their opinions were developed. Text book writing plans are included in the questionnaires to help the understanding on text book contents. The conclusions drawn from results of validity analysis are as follows: First, each theme and modules of 'invention and problem solving' were properly developed for common text books for the advance course of specialized high school of invention and patents. Second, as for the text book writing direction of 'invention and problem solving', text books emphasize research ability and creative thinking. They were developed to help increase critical thinking, logical thinking and problem solving ability.

• Journal of KIISE:Computer Systems and Theory
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• v.29 no.5
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• pp.291-298
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• 2002

Mutual authentication is essential for key exchange protocols and password-based authentication scheme is used widely, which is convenient to users and executed on the cheap. Password-based protocol should be not only secure against attach but also efficient to reduce user's load. In this paper, we propose a new key exchange protocol, called OTP-EKE(One Time Password based Encrypted Key Exchange), to provide authentication and to share a session key between a server and a user. We choose a password-based scheme as a user authentication. Especially, we use a one-time-password verifier and server's public password to protect against attacks on server's directory. As for efficiency, we improve the performance by reducing the number of modular exponentiations and the number of rounds.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.137-139
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• 2012

최근 다양한 모바일 플랫폼과 애플리케이션 스토어에 대한 문제가 점점 커져가고 있다. 그에 발맞추어 최근 애플리케이션 시장규모는 대대적으로 웹으로 넘어가고 있으며, 스토어 또한 같이 성장해 가고 있다. 그러나 현재 출시된 웹 애플리케이션 스토어는 한 스토어에 종속적인 단점을 가지고 있어, 사용자로부터 스토어에 종속된 애플리케이션에 대하여 타 플랫폼에서는 애플리케이션을 사용할 수 없어 사용자에게 폭넓은 선택을 제한하며 불편을 가져다준다. 본 논문에서는 이러한 단점에 대한 해결책으로 웹 애플리케이션 스토어의 연동 모듈을 설계하고, 이를 토대로 웹 애플리케이션 연동 시나리오를 구현한다. 웹 애플리케이션 스토어의 기본 구조는 OMA(Open Mobile Alliance)에서 제안한 TAS(Telco's Application Store)를 따랐으며 기존 TAS의 모듈에 연동을 위한 모듈을 추가 확장하여 설계하고 이를 OWS(Open Web Store)라 명한다. OWS는 차세대 웹 언어를 사용하는 웹 애플리케이션을 다루기 때문에 애플리케이션 플랫폼에 독립적인 성향을 가지므로 소비자는 운영체제, 브라우저, 단말기 등의 종류에 구애 받지 않고 다양한 애플리케이션을 접할 수 있다. 본 논문에서 OWS간 연동을 위한 시나리오를 구상하고 프로토타입을 구현하여 기존의 애플리케이션의 단점을 보완할 수 있는 방법을 제시한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.6
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• pp.139-147
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• 2014

The ballast water may be discharged into another sea area with marine organisms, it caused problems to disturb the marine ecosystem. So, in order to remove these environmental risk factors, the IMO has mandated the installation of BWTS to the all ships. Our monitoring system diagnose and predict a failure of BWTS by analyzing the sensor information of BWTS collected from which the ships scattered in the ocean of several. This paper presents the design and implementation of communication modules for BWTS remote monitoring considering the satellite communication charge fee. In the our study, we implemented the safety and cost-saving communication modules by LabVIEW program. The collected sensor informations is encrypted and compressed by LabVIEW modules running on RIO. Then they will be transfer to the land server and will be decrypt to enable monitoring in the land server. For the verification, we build the test modules which can verify from collecting the sensor data to consuming them in the monitoring server. We carried out 20 times for the data pattern in all of case. So, we verified the excellent functionality and reliability through the experimental result.