• 동의신경정신과학회지
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• 제6권1호
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• pp.1-17
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• 1995

In order to investigate the Anti-stress effect of Guibiondamtang in the immobilization stressed rats, the level of serum catecholamine, the change of body weight, the humoral and cellular immune response were studied. The results were as follows; 1. The decrese of the body weight was significantly inhibited in test group for Guibiondamtang, comparting to the control group. 2. The increase of the level of serum norepinephrine was significantly inhibited in test group, comparing to the control group. 3. The increase of the level of serum epinephrine was significantly inhibited in test group, comparing to the control group. 4. In the hemagglutinaton titer, the control group was decreased on the serum antibody titer but test group was inhibitory effect on the decrease of sereum antibody titer. 5. In the plaque formation test, the control and test group were not shown significant differences. 6. In the foot pad swelling respopnse, the control group was decreased on DTH response but test group was increased comparing to the normal group. 7. There was no change on the distribution of lymphocyte subset(CD4, CD8), grnulocyte and macrophage analyzed by flow cytometry.

• 자연, 터널 그리고 지하공간
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• 제1권2호
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• pp.59-71
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• 1999

Recently, many deformations in tunnel such as crack and leakage were occulted. Specially, the defects of tunnel lining have been a serious problem in safety and stability many repair works for maintenance in tunnel have been carried out. Therefore, it is necessary to estimate the structural cracking for countermeasure in deformed tunnel and to investigate on the characteristics of lining system and the soundness of tunnel. In this study model tests for tunnel lining were carried out using test apparatus and centrifuge, In the direct loading test, the prototype was Kyungbu high-speed railway tunnel and the scale is 1/10, and lining models were made of concrete. Test conditions included load conditions such as direction, shape and type, lining conditions such as single and double lining, thickness, and reinforcement. In centrifuge model test, the prototype was Seoul subway tunnel and the scale is 1/100, and lining models were made of aluminum and hydrostone. Test conditions included tunnel defects such as thickness shortage. behind cavity and longitudinal cracks, reinforcement methods such as epoxy, grouting and carbon sheet. From these model tests , the characteristics of deformation and failure for tunnel lining were estimated, and the structural behaviors of deformed lining and the effects of repair and reinforcement for tunnel lining were researched.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.1004-1007
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• 2005

본 논문에서는 저잡음 증폭기 (Low Noise Amplifier, LNA)를 위한 프로그램 가능한 RF (고주파) BIST (Built-In Self-Test) 회로를 제안한다. 개발된 BIST 회로는 온 칩 형태로 DC 측정만을 이용하여 LNA의 RF 변수들을 측정할 수 있다. BIST 회로는 프로그램 가능한 커패시터 뱅크 (programmable capacitor banks)를 가진 test amplifier와 RF 피크 검출기로 구성되어 있다. 이러한 온 칩 회로는 각각 GSM, Bluetooth 및 IEEE802.11g의 응용을 위해 세 가지 주파수 대, 즉 1.8GHz, 2.4GHz 및 5GHz에서 사용할 수 있도록 프로그램 되어있고, LNA가 가지는 RF 사양들, 즉 입력 임피던스 및 전압이득 등을 DC 전압으로 변화시켜주는 역할을 한다.

• 응용통계연구
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• 제6권2호
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• pp.289-302
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• 1993

본 연구에서는 지수분포성 적합도검정 문제를 다루는데, 모수가 미지인 상황에서 제1종단일 우측중도절단 표본과 제2종우측중도절단 표본인 경우에 각각 적용될 수 있는 새로운 검정통 계량을 제안하였다. 미지의 모수 문제를 해결하기 위해서 K-변환을 고려하였으며 중도절단 균일표본을 완결 균일표본으로 전환시키기 위해서 Rosenblatt 변환을 적용하였다. 전환된 완결 균일표본의 적합도검정을 위한 통계량은 분포함수와 경험분포함수의 편차의 $L_1-norm$ 으로 정의되었다. 검정 통계량의 임계치는 Monte Carlo simulation에 의해 구 했으며, 잘 알려진 Pettit 검정법과 검정력을 비교하였는데, 새로 제안된 검정통계량의 검정 력이 대체로 우수한 것으로 평가되었다.

• 항공우주시스템공학회지
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• 제12권1호
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• pp.42-46
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• 2018

본 연구는 소형 엔진 추력 시험 장비에 대한 구조의 안전성 해석에 관한 연구이다. 본 연구에서 소형 엔진 시험 장치를 위한 철강 및 알루미늄 합금 적용 구조의 설계 및 해석을 수행하였다. 1차적으로 엔진 시험 장치의 구조 설계 요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 엔진 시험 장치의 구조 해석이 수행되었다. 적용 하중 조건에서 응력 및 변위 해석이 수행되었다. 최종 구조 해석을 통해 설계된 엔진 시험 장치 구조는 안전한 것으로 확인되었다.

• 항공우주시스템공학회지
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• 제1권3호
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• pp.13-20
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• 2007

The objective of this study is to investigate endurance test of localization part for T-50 aircraft engine. Major localization parts of the engine (F404-STW-102) was performed using Accelerated Simulated Mission Engine Test. The purpose of this test is to evaluate of quality demonstration capability, to verify design of engine localization parts, and to improvement safety and operation rate of T-50 advanced trainer by finding out operational problems in production phase and fixing it.

• 한국신뢰성학회지:신뢰성응용연구
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• 제10권1호
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• pp.25-38
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• 2010

In this paper, an accelerated degradation test procedure for an electronic appliance compressor is proposed. We investigate the amount of wear of the compressor and consider several factors as accelerating factors. Finally we select the operating pressure as a main accelerating factor. The test condition of accelerated degradation test is determined. The modified accelerating test reduces the test time in design phase by using the suggested accelerating factor.

• Journal of the Korean Statistical Society
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• 제36권1호
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• pp.149-156
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• 2007

This study suggests a new method for testing seasonal unit roots in a momentum threshold autoregressive (MTAR) process. This sign test is robust against heteroscedastic or heavy tailed errors and is invariant to monotone data transformation. The proposed test is a seasonal extension of the sign test of Park and Shin (2006). In the case of partial seasonal unit root in an MTAR model, a Monte-Carlo study shows that the proposed test has better power than the seasonal sign test developed for AR model.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.151-152
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• 2019

This study length variation test, shock test were conducted to evaluate the performance of synthetic resin form. Results of both thermal length variation test and shock test satisfied the KS standards. for length variation test, the result of the horizontal and vertical valuse were -0.1% in average.

• 전자공학회논문지B
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• 제29B권9호
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• pp.1-7
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• 1992

This paper proposes a built-in self-test tchnique for CMOS circuits. To detect a stuck-open fault in CMOS circuits, two consequent test patterns is required. The ordered pairs of test patterns for stuck-open faults are generated by feedback shift registers of extended length. A nonlinear feedback shift register is designed by the merging method and reordering algorithms of test patterns proposed in this paper. And a new multifunctional BILBO (Built-In Logic Block Observer) is designed to perform both test pattern generation and signature analysis efficiently.