• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.660-663
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• 2009

Currently in Korea, the lack of facilities and technical criteria for the performance test of small hydropower degrades the efficiency of the domestic small hydropower turbine, and makes it difficult to objectively evaluate the performance of hydro turbine. Therefore Korean institute of water and environment in K-water planned making a basis of performance test of small hydropower by using our flowmeter calibration system the largest one in Korea. We planned the maximum measurable power of hydro turbine will be 200 kW in our system. Improving the efficiency of small hydropower system can achieve the additional development benefit about 1.5 billion won per year.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.494-497
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• 2004

계통연계형 태양광발전 시스템의 확대보급에 따라 단독운전 검출기법의 검출 성능에 대한 검증의 필요성이 대두되고 있다. 본 논문에서는 단독운전 검출기법의 대표적인 능동적 검출기법인 무효전력 변동기법 (reactive power variation method)과 주파수 쉬프트기법(active frequency drift method)을 IEEE Std 929-2000에서 명시된 단독운전검출 시험 방법을 이용하여 단독운전검출기법의 성능 및 불검출 영역(non-detection zone)에 대하여 비교 분석하였다.

• The KSFM Journal of Fluid Machinery
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• v.19 no.2
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• pp.43-48
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• 2016

This study proves successes of Energy Service Company (ESCO) business by heat pump performance test. The purpose of ESCO business is recover investment costs through saving energy from installation of energy reduction facility. The most important technology assessment items are heat recovery and generator output. Experimental result shows that increase quality of heat recovery (11.52Gcal/h), while decrease generator output (0.234kw). In its final analysis, the ESCO business is successful according to our data.

• Proceedings of the KIEE Conference
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• summer
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• pp.1480-1482
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• 2004

계통연계형 태양광발전 시스템의 확대보급에 따라 단독운전 검출기법의 검출 성능에 대한 검증의 필요성이 대두되고 있다. 본 논문에서는 단독운전검출기법의 대표적인 능동적 검출기법인 무효전력변동기법 (reactive power variation method)과 주파수 쉬프트기법(active frequency drift method)을 IEEE Std 929-2000에서 명시된 단독운전검출 시험방법을 이용하여 단독운전검출기법의 성능 및 불검출 영역(non-detection zone)에 대하여 비교 분석하였다.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.104-110
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• 2007

FTTH상용화, IEEE802.11n 무선랜 기술의 상용화 등과 같은 초고속 전송기술의 발전에 따라 홈네트워킹 환경 또한 급격하게 변화하고 있다. 100Mbps를 초과하는 많은 홈네트워킹 기술들의 개발로 인해 홈게이트웨이에 보다 넓은 대역의 LAN 인터페이스를 요구하게 되었고, xDSL이나 케이블모뎀 기반의 가입자망과의 대역폭 차이는 고성능의 QoS 기능을 요구하게 되었다. 이러한 통신환경을 토대로 홈게이트웨이의 기능에 대한 요구사항을 분석하고 홈게이트웨이용 스위칭 칩의 개발규격을 도출하였다. 그리고 새로운 네트워크 기반의 비즈니스 모델을 개발하고자 하는 통신사업자의 요구사항과 QoS나 IPv6등의 다양한 네트워크 요구사항을 등을 유연하게 수용할 수 있으며, 칩의 기능과 성능을 수정하 또는 추가할 수 있는 네트워크 프로세서 기반의 기가빗 스위치 칩을 개발하였다. 개발 칩은 패킷 프로세서로 Layer 4까지 의 패킷헤드를 처리하고, 2기가빗이더넷 + 6패스트이더넷 포트를 갖도록 설계하였으며, FPGA를 이용하여 스위칭 칩의 기본적인 전송기능과 성능, Flow별 패킷 분류 및 패킷 필터링, 스케쥴링 기능 등의 시험을 통하여 설계한 칩의 기능과 성능을 확인하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.3
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• pp.264-273
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• 2005

Broadband power line communications have been receiving tremendous interest In recent years because this technology enables utilities to deploy a communication network over existing power line infrastructures. Despite the enormous potential, there is some skepticism about the technology and its commercial viability. In this paper, we investigate the performance characteristic of PLC through field test carried out in actual households. Also it addresses major field deployment aspects, such as range, coverage, the number of node for operation and maintenance.

• The Journal of the Acoustical Society of Korea
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• v.20 no.7
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• pp.89-93
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• 2001

In recent years Fiber optic hydrophone systems have been the focus of much attention in the sonar world. For sonar arrays, a fiber optic approach offers the major benefit of passive multiplexing of large numbers of hydrophones without underwater electronics. This paper describes recent development work covering array construction, opto-electronics development, hydrohpone design and sea trials. And the development of an interferometric mult-channel fiber optic hydrophone system which uses time division multiplexing capable of driving in excess of 32 channel is described. For this, a 12 channel time division multiplexing array has been constructed, and the performance of this system is demonstrated by sea trial.

• Current Industrial and Technological Trends in Aerospace
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• v.6 no.2
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• pp.154-160
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• 2008

There are typically two categories of Flight Test Programs- commercial and military. Commercial flight testing is conducted to certify that aircraft meets all applicable safety and performance requirements of government certifying agency. Military programs differs from commercial in that the government contract with the aircraft manufacturer to design and build an aircraft to meet specific mission capabilities. The final phase of military aircraft flight test is the Operational Test(OT). OT is conducted by a government-only test team with the dictate to certify that the aircraft is suitable and effective to carry out the intended mission. This paper presents the current trends of military aircraft airworthiness certification using civil aircraft certification practices.

• The Journal of the Convergence on Culture Technology
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• v.10 no.3
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• pp.7-11
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• 2024

The bedsore prevention cushion serves to prevent the skin on the buttocks of a wheelchair user from being damaged through friction with the wheelchair seat. This is because it absorbs some of the weight applied to the wheelchair seat and allows the weight to be applied evenly to the entire contact surface. For the impact test, which is part of the performance testing of bedsore prevention cushions, a hip model that represents the sitting posture of a wheelchair user is required. In this study, a hip model was manufactured for impact testing of bedsore prevention cushions for wheelchairs. Performance tests for pressure bedsore prevention cushions for wheelchairs include KSP 0236, a Korean standard, and KS P ISO 16840-2, an ISO international standard. The hip model proposed in KS P ISO 16840-2 was more suitable for impact testing of bedsore prevention cushions for wheelchairs. However, the guidelines for making hip models proposed by international standards need to be modified to reflect the advancement of model making technology and use easier methods. We propose a new hip model production method that produces a hip model out of plastic all at once and additionally attaches SS-41 steel plates processed into the shape of the hip to make the mass of the model similar to the human body.

• Journal of the Korea Society for Simulation
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• v.29 no.1
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• pp.1-9
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• 2020

The ballistic missile threat continues to increase with the proliferation of missile technology. In response to this threat, many kinds of interceptors have been emphasized over the years. For development of interceptor, systematic flight tests are essential. Flight tests provide valuable data that can be used to verify performance and confirm the technological progress of ballistic missile defense system including interceptor. However, during flight tests, civilians near the test region could be risk due to a lot of intercept debris. For this reason, reliable estimate of safety area for the flight tests should be preceded. In this study, prediction of safety area is performed through modeling and simulation. Firstly, behaviors of ballistic missile and interceptor are simulated for those entire phase including interception to obtain the relative intercept velocity and the relative impact angle. By using obtained data of kinetic energy, the fragment ejection velocity is calculated and fragment trajectories are simulated by considering drag, gravity and wind effects. Based on the debris field formation and hazard evaluation of debris, final safety area is calculated.