대잠용 수온측정계 측정 메커니즘 개선

신상식 ( Sang Sik Shin ),조환휘 ( Hwan Hwi Cho ),박승수 ( Seung Soo Park ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.3

Purpose: The purpose of this study is to improve a mechanism of expendable bathythermograph measurement by balancing wire resistances between plus wire part and minus wire part and by removing effects of sea water resistance between XBT(Expendable Bathythermograph) and temperature recorder. Methods: The problems are exactly found out through the analysis of XBT and temperature recorder circuit. A process of XBT manufacturing that balances wire resistances between plus wire part and minus wire part is added. Results: The results of this study are as follows; the complicated test process such as temperature accuracy test with a cistern is substituted with a simple process of XBT manufacturing such as balancing wire resistances between plus wire part and minus wire part. Then, the temperature accuracy tolerance of XBT is improved up to ±0.1℃. Conclusion: Consequently, balancing wire resistances and removing effects of sea water resistance improve temperature accuracy of XBT and reduce expensive and harassing process of XBT manufacturing.

풍화 화강암 지반에 건설된 NATM터널에서의 내공변위 연구

신상식(Sang-Sik Shin),김학준(Hak Joon Kim),배규진(Gyu Jin Bae) 한국암반공학회 2015 터널과지하공간 Vol.25 No.6

터널의 안정성 평가와 경제적인 NATM 시공을 위해서는 터널의 내공변위에 대한 예측과 계측이 매우 중요하다. 본 연구에서는 계측 결과를 활용하여 굴착 전과 굴착 후에 지반에서 발생하는 변위를 추정하는 방법을 문헌조사를 통하여 제시하였다. 일반적으로 터널 건설과 관련하여 지반에서 발생하는 전체 변위량은 계측 변위 값의 약 2.5배 정도일 것으로 판단되었다. 또한 본 연구에서는 암반등급이 유사한 화강암 지반에 건설된 두 터널에서의 현장 계측 결과를 분석하여 내공변위에 영향을 미치는 인자들을 분석하였다. 경주 A터널이 대전 B터널보다 변위량이 6.7배 더 크게 측정되었으며 이에 대한 원인이 제시되었다. 터널 내공변위를 예측하기 위해서는 터널 내부에서의 굴착면의 막장관찰뿐만 아니라 지표면에서의 지질구조 특성과 터널에 응력을 증가시킬 외부적인 요인에 대한 면밀한 검토가 수반되어야 한다. Predicting and measuring tunnel convergence is very crucial for estimating tunnel stability and economical construction of NATM tunnels. The method to estimate the tunnel convergence that occurs before and after construction is proposed based on literature reviews. The total displacement occurring related to tunnel construction is determined to be about 2.5 times that of measured displacements. The results of displacement measurements at two tunnels constructed with similar rock types are examined for the investigation of factors affecting the tunnel convergence. The average convergence of Gyungju A Tunnel is about 6.7 times bigger than that of Daejeon B Tunnel. The possible causes of the large convergence in Gyungju A Tunnel are suggested. In order to predict the convergence of tunnels, careful investigation of the geological structures in the ground surface and the influence of external conditions as well as careful face mapping of the tunnel face should be conducted.

개착식 굴착공사 중 지반함몰 위험등급 분류시트의 등급 보정에 관한 연구

신상식 ( Sang-sik Shin ),김학준 ( Hak Joon Kim ) 대한지질공학회 2021 지질공학 Vol.31 No.2

굴착 전 지반조사 결과를 활용한 지반함몰 위험등급 분류는 시공 과정에서 들어나는 인자들에 따라 평가 결과가 다르게 나타날 수 있다. 본 연구에서는 기존 연구에서 제안된 굴착 전 지반조사 결과를 활용한 지반함몰 위험등급 분류 방법을 현장상황을 고려하여 보정하는 방법을 제시하였다. 굴착 진행 중 지하수위는 차수공법의 적용 여부나 시공 상태에 따라 유출되는 정도가 시공 전 예측결과와 다르게 나타난다. 굴착 중 급격한 지하수위 하강은 압밀이나 압축 등의 체적 감소로 지반함몰을 유발하고 집중 호우 등에 의한 수위 상승은 굴착 저면의 히빙이나 보일링을 발생시켜 지반함몰 위험도를 높인다. 굴착 중 흙막이 벽체의 과도한 변위나 지반침하는 지반함몰의 원인이 될 수 있으며, 매설된 관로의 파손을 야기하여 지반함몰 위험도를 높인다. 본 연구에서는 굴착 중 지하수 변동 및 유출상태, 지반변위, 흙의 종류 등을 고려하여 지반함몰 영향인자를 재평가하는 방법을 제안하였다. 최종적으로 지반함몰 평가의 영향인자를 5개 카테고리의 12개 영향인자로 평가할 수 있도록 개선하였다. Ground subsidence risk ratings obtained from the site investigation during pre-excavation stages could be changed depending on the parameters revealed during construction activities. A method of correcting the pre-excavation ground subsidence risk ratings based on the site conditions observed in the field is suggested in this study. The elevation of groundwater table during the excavation may be different from the predicted value depending on the application of waterproofing methods and construction conditions. The drastic drawdown of groundwater table during the excavation could cause ground subsidence due to soil volume decrease related to consolidation or compression of the ground, whereas the rising of groundwater table caused by the intense rainfall may result in a high potential for ground subsidence due to heaving or boiling of the excavation bottom. Excessive displacements of retaining walls or ground settlements may cause ground subsidence, which also results in a high risk of ground subsidence caused by the destruction of buried pipelines. Reevaluation of ground subsidence risk ratings is suggested considering the fluctuation of groundwater table, condition of groundwater leakage, measured ground displacements, and soil types. Finally, the ground subsidence risk rating system is improved for better evaluation by using 12 factors in 5 categories.

확률 기반의 위험등급평가 객관화 방안

신상식 ( Sang Sik Shin ),이길수 ( Kil Soo Lee ),조흥기 ( Heung Gi Cho ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.3

Purpose: To provide a variety of stable military supplies. risk should be avoided or removed. This paper aims to provide an objective method of risk assesruent for risk matrix to evaluate risk level. Methods: According to previous results of risk assesrnent through risk matrix. some parameters and probability density functions. which include characteristics of military supplies. are selected and Risk matrix is modelled based on that. Results: Results show that a proposed method can evaluate objectively risk level through the stochastic modelling and provide well-balanced risk assessments by categorizing into 3 levels such as high, middle and low level risk. Conclusion: A current risk assessment method includes substantial subjectivity of risk assessment and as a problem about military supplies comes up, we can not show any appropriate evidences for decision of risk assessment. We propose an objective scheme employing stochastic modelling with parameters and probability density functions.

P28~P48 경영품질/품질경영 : 70. ; P28~P48 경영품질/품질경영 : 64. ; 대기뢰전용 무인기뢰처리기 수중항법 시스템 메커니즘 개선

신상식 ( Sang Sik Shin ),김병규 ( Byeong Kyu Kim ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.1

저연산 연판정 기반의 다중 안테나 반복검출 기법

신상식(Sang-Sik Shin),최지웅(Ji-Woong Cho) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.8

본 논문에서는 채널부호화 다중 안테나 시스템에서 공간다중화 전송된 신호들을 효과적으로 복조하기 위한 저연산 연판정 복조 다중 안테나 반복검출 기법을 제시한다. 반복 검출기법의 경우 우수한 성능에도 불구하고 연산량의 복잡성으로 수신단에 높은 복잡도를 요청하게 된다. 이러한 복잡도 감소를 위해 차원감소 소프트 검출 기법 (DRSD)과 모든 순서 순차적 간섭 제거(AOSIC) 기법을 사용한다. 이 기법의 경우 기존 기법들에 비해 반복검출 기법의 연산량의 복잡성을 줄일 수 있으며 향상된 성능을 얻을 수 있다. In this paper, we propose an iterative soft dimension reduction based multi-input multi-output (MIMO) detection for coded spatial multiplexing system. In spite of better performance of iterative MIMO detection, its computational complexity gives a significant burden to the receivers. To mitigate this problem, we propose a scheme employing all ordering successive interference cancellation (AOSIC) for hard-decision detection and dimension reduction soft demodulator (DRSD) with iterative decoding for soft-decision detectors, respectively. This scheme can reduce complexity of iterative soft MIMO detection and provide better performance than other conventional detectors.

GSRe 인자별 지반굴착 현장 검토 항목 개발 및 적용 연구

신상식(Shin, Sang-Sik),김학준(Kim, Hak-Joon),백용(Baek, Yong),임명혁(Ihm, Myeong-Hyeok) 한국지반신소재학회 2018 한국토목섬유학회 학술발표회 Vol.2018 No.9

차기호위함 가변피치 프로펠러 오작동 개선

신상식 ( Sang-sik Shin ),서형필 ( Hyeong Pil Seo ),차영주 ( Young-ju Cha ) 한국품질경영학회 2017 한국품질경영학회 학술대회 Vol.2017 No.1

분산분석을 활용한 K11 복합형소총 사격통제장치 균열발생 원인 연구

신상식 ( Sang Sik Shin ),김병규 ( Byeong Kyu Kim ),심철보 ( Chul Bo Sim ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.3

Purpose: This study examined the problem of crack formation in the fire control system(FCS) of the K11 objective individual combat weapon(OCIW), using design of experiment analysis. Three hypothesis were considered. The first hypothesis is that bolted joint has an effect on impulse caused by firing the weapon and the second hypothesis is that a short time interval of shooting has an effect on impulse and lastly, the third hypothesis is that a positive correlation has between the bolted joint of the FCS and the impulse. Methods: The relationship between the bolted joint and the impulse cause by firing the weapon were examined experimentally. The first and second hypothesis was tested using correlation analysis and the t-test. Results: Using ANOVA, the first null hypothesis was rejected and the alternative hypothesis was accepted. ANONA confirmed the second null hypothesis. Correlation analysis dismissed the last null hypothesis. A positive correlation between the bolted joint and the impulse caused by shooting the weapon was verified. Conclusion: The bolted joint of the K11 FCS and the barrel of the K11 affect the impulse caused by firing the weapon. A positive correlation was established between the bolted joint of the FCS and the impulse on firing the K11 OICW.

학술구두세션 : C7국방품질 ; C7.5 : 수온기록계 측정 메커니즘 개선

신상식 ( Sang Sik Shin ),조환휘 ( Hwan Hwi Cho ) 한국품질경영학회 2014 한국품질경영학회 학술대회 Vol.2014 No.1