• Fire Science and Engineering
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• v.18 no.4
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• pp.72-77
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• 2004

In this paper, we studied on the short-circuit process, surface structure, and component variation of vinyl cords. In the results of high speed imaging system (HSIS) analysis, as soon as wire covering was damaged by heat, the conductor of wire came in contact with the other conduct of wire, and the short-circuit occurred. Stereomicroscope and SEM analysis indicated that the source part of wire showed V-type form. The molten beads of load part were bigger than those of source part. In the results of EDX analysis, Cu and O were detected in the source part, whereas covering material (Cl, Ca), Cu and O were detected in the load part. The results will help us to find out the cause of electrical fire.

• Journal of KIISE:Software and Applications
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• v.31 no.11
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• pp.1496-1504
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• 2004

In this paper, we propose an algorithm for initializing a target vehicle detection, tracking the vehicle and estimating the distance from it on the stereo images acquired from a forward-looking stereo camera mounted on a road driving vehicle. The process of vehicle detection extracts road region using lane recognition and searches vehicle feature from road region. The distance of tracking vehicle is estimated by TSS correlogram matching from stereo Images. Through the simulation, this paper shows that the proposed method segments, matches and tracks vehicles robustly from image sequences obtained by moving stereo camera.

• Proceedings of the KSAR Conference
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• 2001.03a
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• pp.77-77
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• 2001

본 연구는 돼지 동결정액의 번식성적을 개선코자 기존의 maxi-straw와 cryogenic-vial을 이용하여 포장방법에 따른 동결방법과 융해방법별 정액성상 및 번식성적을 비교하였다. 동결방법은 두 가지 포장방법 모두 정액의 양(5$m\ell$)과 농도(5.0$\times$$10^{9}$/dose)가 동일한 조건으로 처리하였으며, LYE(Lactose egg york extender) 보존액으로 희석하여 액체질소 상단 15cm에서 20분간 동결하였다. 융해방법은 maxi-straw는 52$^{\circ}C$에서 45초간 cryogenic-vial은 52$^{\circ}C$에서 190초간 융해하여 $25^{\circ}C$로 가온 된 80$m\ell$ BTS (Beltsville thawing solution) 보존액과 혼합하였다. 정액성상검사는 정자자동분석기(SAIS : Sperm Analysis Image System, Korea)를 이용하였다. 총활력(TM : Total motility)과 정자의 빠르기(VCL : Curve linear velocity)는 maxi-straw가 54.3%와 46.6%로 cryogenic-vial의 35.6%와 36.6%보다 우수하였다(P<0.05). 정자의 직진성(STR : Straightness)과 NAR은 maxi-straw가 53.2%와 32.6%로 cryogenic-vial의 47.3%와 29.8%와 비슷한 경향을 나타내었다. 수태율과 분만율 및 총산자수는 maxi-straw가 77.3%, 68.2% 및 8.0두로 조사되어 cryogenic-vial포장방법의 66.7%, 61.9% 및 7.4두보다 다소 우수하였으나 통계적인 유의차는 인정되지 않았다. 이상의 결과로 볼 때 cryogenic-vial방법이 새로운 돼지 동결정액 포장방법의 가능성을 나타낸다고 사료된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.2
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• pp.525-531
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• 2010

In this paper, a mobile quiz system using SMS has been developed, which can be conveniently used on the spot of education. The system immediately not only provides each individual student with the results of his/her quizzes but also a instructor with the statistics of the results by SMS. Field tests of the quiz system have shown that it can be effectively used as a good teaching tool for teachers getting immediate feedback from participants in the lecture and adjusting teaching level as well as for inducing more interest in learning from participants and raising their concentration on the class.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.10
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• pp.766-770
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• 2009

Recently, users of multimedia files demand a high capacity file via internet. However, it is difficult to guarantee QoS for high capacity files on internet because of its inconstant bandwidth. For guaranteeing the QoS, CDN (Content Delivery Network) is generally used for contents delivery service. Based on CDN, we propose Content Distribution and Management using Metadata (CDM) system which provides advanced transmission method and searching method. To enhance the transmission rate, CDM system supports segment-unit-based transmission method that enables parallel transmission. Also, we propose a distribution method through content based search.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.5B
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• pp.824-832
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• 2010

In construction structure management, the effects of investigation by the professional manager is dependent on the cost, the inspection periods and methods. Therefore, effective and automated maintenance system for the target structure is required. Although some bridge monitoring systems are operating using wire based networks, the performance is not good enough to show sufficient ability as integrated bridge management system. In this paper, we design and implement an integrated bridge management system based on sensor networks. Two expert modules for bridge management and the integrated system management are provided. Moreover, web-based monitoring system is also designed for users at anywhere. The results show that the system is effective and readily available.

• Journal of the Korean Solar Energy Society
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• v.32 no.5
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• pp.75-82
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• 2012

This study aims to investigate the usage of the renewable energy systems installed in buildings and make suggestions for the effective management. In this regard, a questionnaire survey was conducted on 1)design and construction, 2) operation and management, 3) user satisfaction and improvements about the renewable energy systems in buildings. Findings from this study can be summarized as follows; a lack of the basic information about systems, non-use of energy management systems, the differences in the features by energy source, and a lack of expertise of managers. The requirements to resolved these problems include the integrated management of various electric heat sources including a renewable energy source, an operation schedule based on the prediction of production and consumption, and so on. Furthermore the necessity of multiplex energy sources management system was confirmed and the basic data needed to establish the targets of this system were obtained.

• KSCI Review
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• v.14 no.2
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• pp.123-127
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• 2006

In this paper, we designed and implemented home gateway system for remote control of home appliances and devices using cellular phone. The system communicate home devices through Zigbee protocol and home server based on Linux operating system communicate cellular phone through external networks. We expect that the system apply various fields as home automations, home network, smart offices, and ubiquious environments.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.37 no.1
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• pp.11-20
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• 2000

This paper presents the method of extracting the contour and shape parameters for moving object tracking in traffic scenes. The contour is extracted by applying difference image method in reduction image and the features are extracted from original image to grow the accuracy of tracking. We used features such as circle distribution, center moment, and maximum and minimum ratio. Data association problem is solved by these features. Kalman filters are used for moving object tracking on real time. The simulation results indicate that the proposed algorithm appears to generate feature vectors good enough for multiple vehicle tracking.

• The Journal of Korean Association of Computer Education
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• v.10 no.4
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• pp.17-25
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• 2007

In this paper, the simplification procedure of Karnaugh Map, which is essential to design digital logic circuits, was implemented as a web-based educational tool by Java applet. The learners can make virtual experiments on the simplification of the digital logic circuit by clicking on some buttons or filling out some text fields. The proposed simplification procedure was implemented as a Java applet which is based on the Modified Quine-McCluskey algorithm. Thus, the implemented Java applet will enable the learners to enhance the learning efficiency as a auxiliary educational tool.