• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.129-131
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• 2015

본 논문은 통합경보게이트웨이를 통하여 이기종 예 경보시스템들 간 상호 연계 및 재난 경보를 발령할 수 있는 통합경보시스템(Integrated Emergency Alert System)을 제안한다. 제안한 시스템은 재난 발령 인지를 담당하는 유관기관으로부터 재난 정보를 수집하고 이를 기존의 이기종 경보방송단말간의 연동을 위한 프로토콜로 변환하여 재난 상황 모델에 맞춰 경보 단말로 전달하는 기능을 가진다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.155-156
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• 2014

본 논문에서는 키넥트 기반의 동물농장 게임을 설계하고 구현한다. 이 게임은 다양한 동물과 울음소리를 이용하여 유아의 지능 및 신체 발달을 목적으로 하는 유아 교육용 게임이다. 다양한 동물 이미지는 랜덤하게 화면에 출력되고, 플레이어는 화면에 출력된 동물 이미지를 순서대로 터치함으로써 점수를 획득하도록 구현한다. 또한 화면에 출력된 동물 이미지를 터치하면 해당 동물의 울음소리를 출력하도록 구현한다. 플레이어의 동작은 키넥트를 이용하여 인지한 플레이어의 스켈리톤 정보를 전송 받아 이용한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6B
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• pp.1143-1152
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• 2000

As being various user telephone number after entry of new telecommunication enterprise, management of systematic Directory Assistance Service is required. Also through providing competition of Directory Assistances Service, enhancement of Service quality and development of new Service are induced. In this study, there is researched the overall view of present Directory Assistance Service in priority Korean Telecom and the oversea's Directory Assistance Service for U.S.A, England, Australia, Japan. As result of study, we want to suggest the appointment of unified Directory Database Management Company and outsourcing of Directory Assistance Service to that company but in reality, there may be other idea also with regard to various circumstances.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.230-232
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• 2004

In this paper, we investigated dielectric and insulation characteristics of epoxy resin which includes elastomers to improve mechanical property, as varied additive elastomer contents with 5[phr], 10[phr], 15[phr], and 20[phr]. We measured permittivity and tan $\delta$ at 1kHz of signal frequency and room temperature. And we also measured BVD(break-down voltage) and volume resistivities. According to the experimental results, it is appeared that when the additive elastomer contents are increasing, permittivity, volume resistivity, BVD and volume resistance are decreasing because elastomer remains inferior to epoxy resin on electrical properties.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.33
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• pp.1-10
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• 1995

The allocation of files is essential to the efficiency and effectiveness of a distributed system that must meet geographically dispersed data processing demands. In this paper, we address an optimization model that generates optimal file migration policies in distributed database systems. The proposed model is a more generalized model that includes system's capacity constraints - computing sites' storage capacity and communication networks' capacity - which have not taken into consideration in previous researches. Using this model, we can establish initial file allocation, file reallocation and file migration polices that minimize a system operating cost under system's capacity constraints at an initial system design or reorganization point The proposed model not only can be adopted by small-sized systems but also provides a foundation for effective and simple heuristics for adaptive file migration in large systems.

• Journal of the Society of Disaster Information
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• v.20 no.2
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• pp.270-283
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• 2024

Purpose: Considering the rising frequency of earthquakes in Korea, it is crucial to revise the rainfall thresholds for landslide triggering following earthquake events. This study was conducted to provide scientific justification and preliminary data for adjusting rainfall thresholds for landslide early warnings after earthquakes through soil physical experiments. Method: The study analyzed the change in soil shear strength by direct shear tests on disturbed and undisturbed samples collected from cut slopes. Also, The study analyzed the soil strength parameters of remolded soil samples subjected to drying and wetting conditions, focusing on the relationship between the degree of saturation after submergence and the strength parameters. Result: Compaction water content variation in direct shear tests showed that higher water content and saturation in disturbed samples led to a significant decrease in cohesion (over 50%) and a reduction in shear resistance angle (1~2°). Additionally, during the ring shear tests, the shear strength was observed to gradually decrease once water was supplied to the shear plane. The maximum shear strength decreased by approximately 65-75%, while the residual shear strength decreased by approximately 53-60%. Conclusion: Seismic activity amplifies landslide risk during subsequent rainfall, necessitating proactive mitigation strategies in earthquake-prone areas. This research is anticipated to provide scientific justification and preliminary data for reducing the rainfall threshold for landslide initiation in earthquake-susceptible regions.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.327-332
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• 2002

식물조직배양용 바이오리액터내 배양액의 pH, DO 농도를 on-line으로 계측하고 제어하기 위한 시스템을 개발하여 시스템의 성능시험과 경시간격별 배양액의 농도변화를 계측하였으며, 주요 연구결과는 다음과 같다. 가. 복수의 바이오리액터내 배양액의 pH, DO 농도를 전극을 이용하여 on-line으로 계측하며, 농도의 계측값과 목표값을 비교하여 피드백으로 제어할 수 있는 시스템을 개발하였다. 나. 배양액의 농도변화를 계측한 결과 pH는 배양초기 5.0에서 배양이 경과됨에 따라 서서히 떨어져 2개월 후에는 3.8까지 떨어지는 것으로 나타났다. 다. 배양액의 성분중 배양초기에는 암모니아태 질소의 흡수가 질산태 질소보다 많이 이루어져 구근으로부터 H+이온을 유출시킴으로 pH의 값이 떨어지는 것으로 나타났다. 라 오염이 발생한 리액터내의 배양액 성분은 pH의 값이 3이하로 떨어졌으며, 이로부터 배양액의 오염경보를 할 수 있는 것으로 나타났다.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.655-658
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• 1999

In this paper, Parallel operation of two DC-DC converters which we have ever done before need two CTs to do load current sharing. However, we have proposed a new method called ZCT method that can share load current with only a CT as doing parallel operation two converters with same converter capacity. To confirm parallel performance by a proposed DC-DC converter parallel operation method, we have done computer simulation and experiment. It is certain that we have showed to achieve two converters current sharing performance efficiently through simulation and experiment at result.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.947-952
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• 1992

A batch reaction calorimeter is the device for estimating reaction heat along time. Reaction heat formation data are very imoprtant for batch reactor behavior analysis and operatoin. So, many types of reaction calorimeter have been introduced and used. In this study, we analyze the dynamic charateristics of the batch reaction calorimeter that is designed in our laboratory. And we introducde suitable temperature control system. As a result, we analyze reatin heat formation data obtained by simulation and introduce its application examples.

• Proceedings of the Korean Society of Crop Science Conference
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• 1994.06a
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• pp.70-71
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• 1994