• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.243-245
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• 2018

발사체 및 인공위성에서 발사시부터 우주까지 도달하는데 다양한 환경이 주어진다. 본 논문에서는 발사체의 단분리 및 페어링 분리시 생기는 충격 환경과 대기가 발사체 표면에 충돌하여 생기는 진동 환경에 대한 배터리 내부 변화를 분석한다. 환경시험을 반영한 전기적 모델링을 설계하고 전기적 파라미터를 기반으로 배터리 열해석과 실제 배터리팩 내부 열을 측정하여 비교 및 분석한다.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1365-1367
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• 2000

In electric railway system, potential of rail has been risen, for return-current flows through rail. The magnitude of rising voltage is different to railway feed system, ground admittance of rail and the load current. If rising voltage of rail is large, electric shock can be occurred to passengers and maintenance-worker. In this paper, we estimate the rising voltage of rail in high speed railway system and check the safety to human beings.

• Proceedings of the KIEE Conference
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• 2005.07e
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• pp.43-45
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• 2005

Electric accidents, like getting electrified, sometimes happen to people working on electricity. A highly probable reason why these electric accidents happen is that workers are used to skip confirming disconnection of electricity when they work. It is mostly because they have little understanding of electricity. To overcome this, various applications such as 'electric detecting stick' are invented to check existence of electricity on working environment. But, they have not been popular due to inconvenience of carrying. So, we made a new instrument. It is a kind of nipper on which electric detecter is installed. Detecting existence of electricity is less burdensome via this tool we made.

• Proceedings of the KIEE Conference
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• 2005.10a
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• pp.158-160
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• 2005

Electric accidents, like getting electrified, sometimes happen to people working on electricity. A highly probable reason why these electric accidents happen is that workers are used to skip confirming disconnection of electricity when they work. It is mostly because they have little understanding of electricity. To overcome this, various applications such as I electric detecting stick' are invented to check existence of electricity on working environment. But, they have not been popular due to inconvenience of carrying. So, we made a new instrument. It is a kind of nipper on which electric detecter is installed. Detecting existence of electricity is less burdensome via this tool we made.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.10
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• pp.1515-1521
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• 2013

In this paper, we develop the power management application of the Android operating system that works with a intelligent concent having the functions to protect resistive leakage current, over-current and standby power. Using this power management application a user monitors electrical fire, shock from a concent due to leakage current, can control home appliances by controlling the power supplied to the concents and can easily protect wasted standby powers, anytime and anywhere.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2238-2240
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• 2005

고전압 감전은 순간적인 사고로서 접촉사고와 비접촉 사고로 나뉘어 진다. 이러한 사고를 모의하기 위하여 고전압 임펄스 발생장치를 이용하여 접촉과 비접촉시의 사고를 모의하고자 한다. 본 논문에서는 우리나라의 배전선로인 3상 4선의 수전설비의 감전위험성을 조사 한 후 인체모델을 가지고 직접 및 간접적으로 가해지는 전압, 전류를 실험을 통해 측정하고자 한다.

• Proceedings of the KIEE Conference
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• 1994.11a
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• pp.314-316
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• 1994

The operation of RC(Rod Consolidation) technology carry out highly radiation environment. It requires remote operation and automation for efficient handling and for minimizing radiation exposure to the operator. So we investigated up and down position control of shock absorber device in RC system. To verify the research experimentally, a RC system was set up and PI control method was applied. Fuzzy control method was also tested to further improve control behavior.

• Proceedings of the KIEE Conference
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• 2001.10a
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• pp.30-32
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• 2001

There are many difficult problems in analyzing the flow characteristics in a high voltage circuit breaker such as shock wave and complex geometries, which may be either static or in relative motion. Although a variety of mesh generation techniques are now available, the generation of meshes around complicated, multi-component geometries like a gas circuit breaker is still a tedious and difficult task for the computational fluid dynamics. This paper presents the CFD program for analyzing the compressible flow fields in a high voltage gas circuit breaker using the Cartesian cut-cell method based on the CFD-CAD integration, which can achieve the accurate representation of the geometry designed by a CAD tools. This technique is frequently satisfied, and it will be almost universally so in the future, as the CFD-CAD traffic increase.

• Journal of the Semiconductor & Display Technology
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• v.21 no.1
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• pp.85-90
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• 2022

In this paper, an asynchronous nonvolatile memory module using a self-diagnosis function was designed. For the system to work, a lot of data must be input/output, and memory that can be stored is required. The volatile memory is fast, but data is erased without power, and the nonvolatile memory is slow, but data can be stored semi-permanently without power. The non-volatile static random-access memory is designed to solve these memory problems. However, the non-volatile static random-access memory is weak external noise or electrical shock, data can be some error. To solve these data errors, self-diagnosis algorithms were applied to non-volatile static random-access memory using error correction code, cyclic redundancy check 32 and data check sum to increase the reliability and accuracy of data retention. In addition, the possibility of application to an asynchronous non-volatile storage system requiring reliability was suggested.

• Journal of international Conference on Electrical Machines and Systems
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• v.1 no.4
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• pp.483-491
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• 2012

It is expected that, in the future, DC power service will be widely used for photovoltaic home power generation systems, since DC consuming devices are ever increasing. Instead of using multiple converters to convert DC to AC and then AC to DC, the power service could solely be based on DC. This would eliminate the need for converters, reducing the cost, complexity, and possibly increasing the efficiency. However, configuration of direct DC power service with mechanical contacts can cause spark voltage or an electric shock when the switch is turned on and off. To solve these problems, in this paper, a contactless power supply for a DC power service that can transfer electric power produced by photovoltaics to the home electric system using magnetic coupling instead of mechanical contacts has been proposed. The proposed system consists of a ZVS boost converter, a half-bridge LLC resonant converter, and a contactless transformer. This proposed contactless system eliminates the use of DC switches. To reduce the stress and loss of the boost converter switching devices, a lossless snubber with coupled inductor is applied. In this paper, a switching frequency control technique using the contactless voltage sensing circuit is also proposed and implemented for the output voltage control instead of using additional power regulators. Finally, a prototype consisted of 150W boost converter has been designed and built to demonstrate the feasibility of the proposed contactless photovoltaic DC power service. Experimental results show that 74~83% overall system efficiency is obtained for the 10W~80W load.