• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.6
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• pp.2359-2368
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• 2013

Cone penetration tests (CPTs) have been increasingly used for site characterizations. However, the site investigations using CPTs are often limited due to soil conditions depending on the cone size and capacity of the CPT system. The small sectional area of a miniature cone improves the applicability of the CPT system due to the increased capacity of the CPT system. A continuous intrusion system using a coiled rod allows fast and cost effective site investigation. In this study, the performance of the continuous intrusion miniature cone penetration test (CIMCPT) system has been evaluated by comparison tests with the standard CPT system at several construction sites in Korea. The results show that the CIMCPT system has a same performance with the CPT system and has advantages on the mobility and applicability. According to field verification tests for scale effect evaluation, the cone tip resistance evaluated by CIMCPT overestimates by 10% comparing to standard CPTs. A crawler mounted with the CIMCPT system has been implemented to improve accessibility to soft ground, and has shown improvement over the truck type CIMCPT system. Therefore, the improved CIMCPT system can be utilized as a cost effective and highly reliable soil investigation methodology to detect the depth of soft ground and to evaluate soil classification.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.483-484
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• 2017

본 논문은 친환경자동차의 보급이 활성화됨에 따라 필수적으로 확보되어야할 전기안전성을 평가하기 위한 장비개발에 관한 것으로, 기존 장비의 문제점과 효율성을 개선하기 위하여 국제기준에 적합한 통합형 평가장비를 개발하였다. 본 연구를 통하여 개발된 제품을 공인 시험기관에서 성능을 검증하였으며, 검증결과 친환경자동차의 정격에 적합한 측정 장비의 사양을 갖는 것을 확인하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.358-360
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• 2003

현재 계측 산업은 자동화와 연계된 모듈화, 디지털화. 네트워크화가 되어가는 가운데 국내의 보드 시험방법의 경우 수 작업에 의존한 방식으로 품질 및 생산성 문제가 많이 발생하고 있다. 이를 위하여 계측장비의 통합 검사 시스템이 필요하다. 본 논문은 임베디드 시스템을 이용한 계측장비 제어에 관한 연구가 이루어졌고, 디지털 멀티미터를 중심으로 계측장비 제어 모듈을 설계하였다. 이를 검증하기 위해 임베디드 웹 서버를 이용하여 웹 브라우저를 통해 원격 제어하였다. 향후 다양한 계측 장비를 동시에 통합 관리할 수 있는 연구가 필요하다.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.185.2-185.2
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• 2012

저궤도 위성 비행모델 기능시험은 위성체 내부 전장품들 간의 접속 확인과 조립 및 연결상태를 확인하는 시험을 우선적으로 수행한다. 위성체의 전원선 확인 시험은 전기 전자적 조립 시험에서 가장 처음으로 수행하는 시험이다. 전력조절분배장치로부터 전장품 각각의 하드웨어로 공급되는 50볼트 주전원 또는 28볼트 부전원이 정상적으로 공급하게 되는지를 검증한다. 위성체 하니스가 설치된 후, 각각의 하드웨어에 공급되는 전원의 극성 및 연속성 시험을 수행한다. 전력조절분배장치는 태양전지판으로부터 얻어진 전력이 레귤레이터에 의해 정류된 전압을 받아 릴레이나 FET를 통하여 모든 전장품에 전원을 공급하는 주요 장비이다. 전력조절분배장치 내부나 외부 하니스 오류로부터 생길 수 있는 잘못 리드된 전원으로부터 전장품을 보호하기 위하여 하니스를 하드웨어에 연결하기 전에 우선적으로 전원선 확인 시험을 수행한다. 위성체 전원선 확인 시험은 위성체와 기능시험장비를 연결하여 시리얼 명령어를 통해 전력조절분배장치 내부의 FET 동작을 조절하며, FET 동작 상태 및 전장품에 접속되는 입력 단에서의 전압 및 전원 특성 등을 점검한다. 위성체의 주전원 50볼트 라인의 연결도 확인과 부전원 28볼트 라인의 연결도 확인 및 전력제어 유닛 내부 FET의 기능 확인을 수행하며 또한, 전력제어부 외부에 공급하는 28볼트 펄스와 15볼트 펄스를 측정 검증하는 시험을 수행한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.10
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• pp.1010-1016
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• 2009

In this paper, we have described an aircraft captive flight test for the development test of weapon systems. We have conducted a captive flight test for the development of core onboard parts and sensors of airborne weapons and guided missiles. We have used KTX-1/XKO-1 aircraft as a platform for the captive flight test. In order to perform a captive flight test, we have made a captive test pod as a shape of external fuel tank in the XKO-1 and have modified XKO-1 aircraft for a system interface. We have taken a development test about all kinds of seekers, navigation & guidance systems, and core part of guided missile through the aircraft captive flight test.

• Proceedings of the Korean Geotechical Society Conference
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• 1993.06h
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• pp.113-151
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• 1993

• Fire Protection Technology
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• s.56
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• pp.55-56
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• 2014

• Journal of Digital Convergence
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• v.15 no.7
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• pp.223-229
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• 2017

Europe, the US and Japan have acquired test results on impact coefficient for a long time and applied it to equipment design to secure safety of structures. However, Korean enterprises use the impact factor held by advanced business to design equipment as it is difficult for them to obtain it through tests. In this paper, NX/NASTRAN, was used to perform static load analysis and impact load analysis of a PCB Handler, semiconductor test equipment, and the result was employed to study how to calculate the impact coefficient with the finite element analysis. The calculation method was applied to the JIS(Japanese Industrial Standard), and the impact coefficient of the PCB handler was calculated as 1.27 for the sudden start or stop. The impact coefficient generated by the analysis is expected to make a great contribution to the industry as it can be used to improve the equipment structure and develop on existing equipment in the future.

• Journal of the Korean Society for Railway
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• v.19 no.6
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• pp.792-801
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• 2016

Standard Penetration Test (SPT) and Cone Penetration Test (CPT) are widely used in geotechnical investigation methods for railway roadbed. However, SPT can not be used on the Railway track, since the equipment may contact to the electric lines. However, a portable equipment can be used for geotechnical investigation without electrical hazard. Dynamic Cone Penetrometer (DCP) is one of representative portable equipments. A normal portable DCP has usually not enough driving energy and the rigidity of cone-rod, so it is impossible to investigate the required investigate penetration depth. In this study, The adaptability of Pagani cone test which is one of portable dynamic cone penetrometer is studied and compared with SPT-N data. As a result of this study, the proposed correlation factors between Pagani cone test and SPT-N values after corrections is 1.48 for sandy soil and 1.33 for clayey soil.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.7
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• pp.594-599
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• 2017

In this thesis, the development and the verification of the test-aid are described, providing various attitude errors through the electric stimulus to the Sun sensor. This test-aid for 2-axis analogue Sun sensor is used for polarity test in the assembly stage for GK2 satellite. The test-aid used for GK2 satellite is for COMS satellite and, due to the failure risk, manufactured by domestic company. The characteristics of the COMS test-aid used for GK2 satellite and the manufactured test-aid are showed with similar through the several tests. In this thesis, there are conformed the capability for replacing of test-aid because the characteristics of the manufactured test-aid is acquired same as that of the COMS test-aid using the controller tuning functions.