• 한국항행학회논문지
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• 제25권6호
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• pp.450-455
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• 2021

본 논문에서는 V2X 통신 기반의 상용차 자율협력주행 플랫폼 평가환경 구축 연구의 내용을 소개한다. V2X 통신 기반의 자율협력주행 플랫폼 평가를 위해서는 다양한 주행 시나리오를 적용할 수 있는 도로 및 V2X 인프라 등의 테스트베드 구축과 함께 시험평가를 위한 각종 제반 규격 및 표준, 지침 등이 개발되어 피시험자에게 제공되어야 한다. 또한, 이를 기반으로 실제 시험평가를 진행할 수 있는 각종 레퍼런스 장비와 시험장비 등이 개발되어야 한다. 본 논문에서는 V2X 통신 기반 상용차 자율협력주행 플랫폼 평가환경을 구성하기 위해 개발된 다양한 기술과 규격, 장비 그리고 구축 인프라를 소개한다.

• 한국군사과학기술학회지
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• 제21권3호
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• pp.342-348
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• 2018

The important issue of equipment installed in maritime weapon system is shock survivability against underwater explosion(UNDEX). If the shock survivability of equipment should not be guaranteed, the successful mission also could not be achieved. For that reason, the shock-resistance of each equipment under UNDEX environment should be demonstrated before deployment at combat field. However, the actual UNDEX test on the ocean is too expensive to conduct. Also, it has diverse dangerous factors. The main characteristic of UNDEX is a dual-pulse shock. The vertical shock test machine able to simulate dual pulse shock signal on the ground will be introduced in this paper. The dual-pulse shock signal presented in certain shock standard was achieved with this shock-test machine on the ground. The analytical procedure to set a test condition was verified by comparing simulation result with experiment result.

• 항공우주시스템공학회지
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• 제13권3호
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• pp.40-47
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• 2019

본 논문은 무인항공기 체계(UAS; unmanned aerial system)의 비행체 탑재장비 및 지상에서 운용하는 장비의 연동 검증을 위한 체계통합실험실(SIL; system integration laboratory) 및 체계통합시험(SIT; system integration test)의 환경 구축 및 이를 통한 검증방법에 대하여 다룬다. SIL 내 구축된 지상통제체계, 데이터링크체계, 비행체 탑재장비, 임무장비(EO/IR, SAR) 등과 같은 부체계간의 인터페이스 환경 및 모의 비행을 통한 체계 운용로직의 검증방법과 실험실 레벨에서의 검증이 완료된 각 부체계를 실제 시험 환경에서 검증하는 방법에 대해 기술한다.

• 신재생에너지
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• 제16권4호
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• pp.49-64
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• 2020

Photovoltaic and Thermal collector (PV/T) systems are renewable energy devices that can produce electricity and heat energy simultaneously using solar panels and heat exchangers. Since PV/T systems are exposed to the outdoors, their reliability is affected by various environmental factors. This paper presents a reliability test for a PV/T system and evaluates the test results. The reliability assessment entails performance, environment, safety, and life tests. The factor that had the greatest influence on the life of the system was the hydraulic pressure applied to the heat exchanger. A test was conducted by repeatedly applying pressure to the PV/T system, and a reliability analysis was conducted based on the test results. As a result, the shape parameter (β) value of 5.6658 and the B10life 308,577 cycles at the lower 95% confidence interval were obtained.

• 한국환경과학회지
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• 제23권11호
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• pp.1801-1805
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• 2014

Longshore current is main transportation mean causing movement of bed load and suspended particle in coastal waters, and effective measurement method and suitable equipment for shallow water coastal environment where is frequently exposed to atmosphere. Measurement equipment for longshore drift was designed and miniature model was applied to Gyeongpo beach in May and June, 2014. The equipment consists of three main elements, spheroid outer casing, spheroid inner casing, observation module equipped with GPS. Gyroscope principle was applied to observation module, and GPS receiver always can be directed upwards. Miniature models were installed along Gyeonpo beach, and it was well to track the flow of longshore current. This research described the design and function of the equipment and results of field experiments.

• 한국전자통신학회논문지
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• 제15권6호
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• pp.1175-1186
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• 2020

본 논문은 전력발전용 가스터빈에 사용하는 내구성이 개선된 Exhaust Gas Temperature(EGT)센서에 관한 연구이다. 가스 터빈에 적용된 EGT 센서는 고온으로 인하여 EGT 센서의 커넥터가 손상되는 문제가 있고 회전 날개의 회전으로 인해 발생하는 심각한 진동 조건에서 센서의 물리적으로 약한 부분이 진동으로 인하여 손상이 야기되기도 한다. 이러한 문제들은 잦은 센서 교체를 유발하고, 발전 효율을 감소시킨다. 본 논문에서는 이러한 문제점들을 분석하고 개선방법을 제시하였고, 제안된 EGT 센서의 성능을 평가하기 위해서, 고온과 진동조건을 동시에 시험할 수 있는 복합 환경 테스트 장비를 개발하였다. EGT센서의 정확도와 응답시간을 평가하고 열과 진동의 복합환경 시험 장비로 비교시험한 결과 기존 센서는 탄화문제가 발생하였지만, 제안된 센서는 이러한 문제가 해결된 것을 확인하였다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.154-154
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• 2018

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.153-153
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• 2018

• 한국압력기기공학회 논문집
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• 제20권1호
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• pp.7-15
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• 2024

Environmental qualification is required for safety related electrical equipment under harsh environments located in nuclear power plants according to 10 CFR 50.49 and RG 1.89. As analog technology has recently been replaced by digital technology, NRC established RG 1.209 as a regulatory guideline for environmental qualification of safety related computer-based I&C system located in mild environments, requiring evaluation for electromagnetic compatibility, smoke exposure and type test for actual service conditions such as temperature and humidity. In this paper, the trend of environmental qualification for digital equipment is analyzed by comparing the environmental qualification requirements between digital and analog equipment.

• 전자공학회논문지B
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• 제33B권7호
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• pp.154-162
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• 1996

The test and evaluation is a integal part of the radar development process and it consists of two parts, field test and in-house test using a standard simulated signal. To take the in-house test, the test environment is needed to generate the critical signal that is used to determine the system design parameters and consists of general urpose measurement equipments, specialized boards and operating softwares. This paper presents the in-house test environment configuration and its function for radar system. Because this test environment genrates the simulated radar signal which has arbitrary flight path and target condition, the developed test environment makes easily to evaluate the function for radar system. The program ability of test parameters makes it possible to apply a test for 2D and 3D radar system.