• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 1999년도 봄 학술발표회 논문집
• /
• pp.277-284
• /
• 1999

This study describes the influence factors related to slope failure pattern and dimension in the southern Kyounggi area. Intrusive and metamorphic rocks are distributed in the study area. Geological condition, rainfall property and slope geometry are influence on slope failure characteristics in the study we& Geological factors related to slope failure are rock type, geological structure and weathering condition. Because of deep soil (RS-CW) depth of granite region, circular failure type is major failure pattern in granite region. Almost granite slopes with circular or surface failure pattern are failed during heavy rainfall season. But typical wedge failure type related to geological structure factor is a main failure pattern of metamorphic rock slope. Additionally failure dimension is influenced by geological factors and several factors, i.e. natural slope condition, failure type, rainfall intensity and etc. failure height/width ratio and thickness/length ratio of granite slope are 0.88 and 0.23. But the ratios of metamorphic rock slope are 1.36 and 0.19.

• International Journal of Reliability and Applications
• /
• 제13권2호
• /
• pp.81-90
• /
• 2012

Engineering systems are usually repairable. The reliability of a repairable system can be represented by failure intensity function. A type of shape of failure intensity function is called a failure pattern. Reliability-Centred Maintenance (RCM) presents six typical failure patterns but its definition is unclear. It is an open issue how to recognize the failure pattern of repairable systems. This paper first discusses the problems of RCM with the notion of failure pattern; then presents the method for failure pattern recognition; and finally proposes a flexible failure intensity function model. The appropriateness of the model is illustrated by a real-world example.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
• /
• pp.703-706
• /
• 2003

Yield enhancement in semiconductor fabrication is important. It is ideal to prevent all the failures. However, when a failure occurs, it is important to quickly specify the cause stage and take countermeasure. The automatic method of failure pattern extraction from fail bit map provides reduced time to analysis and facilitates yield enhancement. This paper describes the techniques to automatically classifies a failure pattern using a fail bit map, a new simple schema which facilitates the failure analysis.

• 디지털융복합연구
• /
• 제11권5호
• /
• pp.257-265
• /
• 2013

창업실패에 대한 선행연구들은 상장기업의 도산원인을 도출하는데 주력하여 왔다. 본 연구에서는 창업기업을 대상으로 실패원인과 실패과정을 분석하고자 한다. 20개 창업기업의 실패사례를 바탕으로 신생의 어려움과 ERIS모델을 활용하여 창업실패 원인을 도출하였다. 국내 창업기업들에게는 경영능력 부족, 연구개발 및 제품화 실패, 판로 확보 어려움과 같은 신생의 어려움이 존재함을 발견하였다. 또한, 창업 실패과정을 사업준비 부족형, 자원획득 실패형, 전략부재형, 마케팅 실패형으로 유형화 하였다.

• Computers and Concrete
• /
• 제28권5호
• /
• pp.507-519
• /
• 2021

In this study, a new procedure was proposed in order to predict the crack pattern and failure mode of steel fiber reinforced concrete (SFRC) corbels. Moreover, an experimental study was carried out in order to investigate the effect of several parameters, such as compressive strength, tensile strength, steel fiber ratio, shear span on the mechanical behavior of SFRC corbels in detail. Totally, 24 RC and SFRC corbels were prepared for the experimental study. Experimental results indicate that each investigated parameter has noticeable effect on the load capacity and failure mode of SFRC corbels. Moreover, finite element (FE) model of the tested corbels were prepared and efficiency of FE model was investigated for further studies. Comparison of FE and experimental results show that there is an acceptable fit between them regarding load capacity and crack patterns. Thereafter, parametric study was carried out via FE analyses in order to obtain a methodology for crack pattern and failure mode prediction of SFRC corbels. As a result of parametric studies, a new procedure was proposed as flowcharts in order to predict the failure mode of SFRC corbels for normal and high strength concrete class separately.

• 한국전자통신학회논문지
• /
• 제11권11호
• /
• pp.1141-1148
• /
• 2016

본 논문은 웨어러블 시스템을 이용하여, ECG 전기 패턴을 QRS을 이용하여 급성 심장마비 예측 감지 시스템으로, 웨어러블 심장 이상 징후 감지 스마트 워치와, 이를 포함 하고 디지털 ECG (X, Y) 패턴 좌표 DB를 이용하여 비정상 패턴을 즉시 감지하고, 급성 심장마비 예방 시스템 및 그 방법을 보여준다. 특히, 디지털 ECG(X, Y) 패턴 정보를 이용한 이상 징후 유형과 대비하는 단계를 통해서 급성 심장마비 발생 시, 골든타임을 놓치지 않고 응급 처치할 수 있음을 보여 준다.

• 한국시뮬레이션학회논문지
• /
• 제14권1호
• /
• pp.1-8
• /
• 2005

In the semiconductor manufacturing, yield enhancement is an urgent issue. It is ideal to prevent all the failures. However, when a failure occurs, it is important to quickly specify the cause stage and take countermeasure. Reviewing wafer level and composite lot level yield patterns has always been an effective way of identifying yield inhibitors and driving process improvement. This process is very time consuming and as such generally occurs only when the overall yield of a device has dropped significantly enough to warrant investigation. The automatic method of failure pattern extraction from fail bit map provides reduced time to analysis and facilitates yield enhancement. The automatic method of failure pattern extraction from fail bit map provides reduced time to analysis and facilitates yield enhancement. This paper describes the techniques to automatically classifies a failure pattern using a fail bit map.

• 한국압력기기공학회 논문집
• /
• 제13권1호
• /
• pp.40-47
• /
• 2017

In this paper, we investigate the feasibility of a strategy of failure detection and identification. The point of proposed strategy includes a pattern extraction approach for failure identification using Auto-Associative Kernel Regression (AAKR). We consider a simulation data concerning 605 signals of a Generic Pressurized Water Reactor(GPWR). In the application, the reconstructions are provided by a set of AAKR models, whose input signals have been selected by Correlation Analysis(CA) for the identification of the groups. The failure pattern is extracted by analyzing the residuals of observations and reconstructions. We present the possibility of extraction of patterns for six failure.

• 한국운동역학회지
• /
• 제12권2호
• /
• pp.259-278
• /
• 2002

본 연구에서는 볼 구질의 변화에 따른 스윙 동작의 운동학적인 변인을 3차원적으로 비교 분석하여 스윙 동작의 운동역학적인 원리를 제시하며, 볼 구질이 다른 스윙 동작의 차이점을 밝히는 데 목적이 있으며, 프로골퍼로 경력 3년 이상의 남자 선수 7명을 대상으로 스트레이트 성공, 페이드 성공과 실패로 구분하여 골프 스윙의 운동학적 변인들을 과학적으로 제시하기 위해 비교 분석한 결과 다음과 같은 결론을 얻었다. 페이드 성공시에는 임팩트를 지나서도 계속 손목의 각도가 근소한 차이로 줄어드는 것으로 나타났고 실패시에는 각 프레임의 각도가 규칙적으로 변하지 않게 나타났다. 이는 스트레이트 성공과 페이드 성공에 대한 손목각도의 차이가 영향을 미치는 것으로 나타나 다른 요인과 손목각도와의 관계를 분석하는 것이 필요하다고 하겠다. 페이드 실패의 경우는 임팩트시의 몸통 비틀림각도가 성공때 보다 작아지면서 클럽헤드가 오픈되지 못한 것으로 나타났다. 골프스윙의 형태의 변화로 인하여 어깨관절의 회전력을 더 많이 사용하여 파워을 증진시키기 위한 동작이며, 골프 스윙에서 어깨회전 운동은 축을 중심으로 회전하기 때문에 어깨회전각도의 차이는 없는 것으로 나타났다. 스트레이트 성공시 보다 페이드 성공시에 고관절의 회전각도가 점진적으로 일정하게 각이 커졌다. 이는 고관절의 회전을 더 크게 하여 지연히팅을 보다 자연스럽게 한 것으로 나타났다. 페이드 볼 구사시 임팩트 존에서 클럽의 페이스가 닫히는 것과 팔의 자연스러운 롤링 동작을 억제시키는 것으로 나타났다. 본 연구에서는 구질 변화에 따른 골프 스윙 동작을 스트레이트 성공, 페이드 성공과 실패시로 구분하여 운동학적 변인들을 3차원 동작 분석을 통하여 경기력 향사에 도움이 되고자 하였으며 앞으로 많은 연구자들이 각 종목에 있어서 경기력 향상을 위한 역학적인 분석이 계속 진행되어져야 할 것이다.

• 한국농공학회논문집
• /
• 제61권2호
• /
• pp.13-23
• /
• 2019

In this study, an overtopping model experiments and three dimensional seepage characteristics at the deteriorated homogeneous reservoirs were performed to investigate the behavior of failure for embankment and spillway transitional zone due to overtopping. The failure pattern, pore water pressure, earth pressure and settlement by overtopping were compared and analyzed. The pattern of the failure by overtopping was gradually enlarged towards reservoirs crest from the spillway transition zone at initial stage. In the rapid stage and peak stage, the width and depth of failure gradually increased, and the pattern of the failure appeared irregular and several direction of the erosion. In the early stage, the pore water pressure at spillway transitional zone was more affected as its variation and failure width increased. In the peak stage, the pore water pressure was significantly increased in all locations due to the influence of seepage. The earth pressure increased gradually according to overtopping stage. The pore pressure by the numerical analysis was larger than the experimental value, and the analysis was more likely to increase steadily without any apparent variation. The horizontal and vertical displacements were the largest at the toe of slope and at the top of the dam crest, respectively. The results of this displacement distribution can be applied as a basis for determining the position of reinforcement at the downstream slope and the crest. The collapse in the overtopping stage began with erosion of the most vulnerable parts of the dam crest, and the embankment was completely collapsed as the overtopping stage increased.