• Journal of the Korean Data and Information Science Society
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• 제16권1호
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• pp.1-11
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• 2005

A network consisting of a set of N nodes and a set of links is considered. The nodes are assumed to be perfect and the states of links to be binary and associated to each other. After defining a network structure function, which represents the state of network as a function of the states of links, we obtain some lower and upper bounds on the network reliability by adopting minmax principle and minimal path and cut set arguments. These bounds are given as functions of the reliabilities of links. The bridge network is considered as an example.

• International Journal of Reliability and Applications
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• 제16권1호
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• pp.15-26
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• 2015

Present study investigates the fuzzy reliability of some systems using intuitionistic fuzzy Weibull lifetime distribution, in which the lifetime parameters are assumed to be fuzzy parameter due to uncertainty and inaccuracy of data. Expressions for fuzzy reliability, fuzzy mean time to failure, fuzzy hazard function and their ${\alpha}$-cut have been discussed when systems follow intuitionistic fuzzy Weibull lifetime distribution. A numerical example is also taken to illustrate the methodology to calculate the fuzzy reliability characteristics of systems.

• International journal of advanced smart convergence
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• 제11권1호
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• pp.1-10
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• 2022

Single-view reconstruction (SVR) is a fundamental method in computer vision. Often used for reconstructing human-made environments, the Manhattan world assumption presumes that planes in the real world exist in mutually orthogonal directions. Accordingly, this paper addresses an automatic SVR algorithm for Manhattan worlds. A method for estimating the directions of planes using graph-cut optimization is proposed. After segmenting an image from extracted line segments, the data cost function and smoothness cost function for graph-cut optimization are defined by considering the directions of the line segments and neighborhood segments. Furthermore, segments with the same depths are grouped during a depth-estimation step using a minimum spanning tree algorithm with the proposed weights. Experimental results demonstrate that, unlike previous methods, the proposed method can identify complex Manhattan structures of indoor and outdoor scenes and provide the exact boundaries and intersections of planes.

• 전기전자학회논문지
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• 제17권4호
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• pp.525-530
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• 2013

워크플로우의 표준인 BPEL은 프로그래밍 언어에 대한 이해도가 낮은 도메인 전문가도 손쉽게 비즈니스 흐름을 작성할 수 있다. 하지만 특정 도메인에서는 BPEL 문법에 없는 새로운 기능이 요구된다. BPEL 엔진이 새로운 기능을 처리하기 위해서는 새로운 BPEL 엔진을 개발하거나 기존의 BPEL 엔진에 기능을 추가해야 하는데 이는 비용이 많이 필요하다. 본 논문에서는 XML 스키마를 확장하여 XAS4B 문서를 제안하고 관점지향 프로그래밍 기법을 이용하여 BPEL 엔진에 새로운 기능을 추가하는 방법을 보인다. 관점지향 프로그래밍 기법은 직조를 이용하여 핵심관심사의 수정없이 횡단관심사를 추가할 수 있다. 본 연구에서는 기존의 BPEL 엔진으로 B2J (BPEL to JAVA)를 사용하는데 이 엔진은 BPEL 문서를 JAVA 프로그램으로 변환하고 이를 실행한다. 본 시스템은 B2J 엔진이 생성한 JAVA 프로그램을 핵심관심사로 새로운 기능을 처리하는 프로그램을 횡단관심사로 두 프로그램을 직조하여 BPEL 흐름에 새로운 기능의 흐름을 추가한다. 제안하는 방법은 BPEL의 새로운 기능을 추상적으로 제공하여 한 번 개발된 새로운 기능을 도메인 전문가가 재사용하기 손쉽다.

• 한국자원식물학회지
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• 제31권6호
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• pp.641-651
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• 2018

Floral scents and metabolites from cut flowers of 14 peony cultivars (Paeonia lactiflora Pall.) were analyzed to discriminate different cultivars and to compare the Korean cultivar with the other cut peonies imported to Korea using electronic nose (E-nose) and Fourier transform infrared (FT-IR) spectroscopy combined with multivariate analysis, respectively. Principal component analysis (PCA) and discriminant function analysis (DFA) dendrogram of peony floral scents were not precisely same but there were 3 groups including same cultivars. PCA and partial least squares-discriminant analysis (PLS-DA) dendrograms of peony metabolites showed that different cut peony cultivars were clustered into two major groups including same cultivars. Fragrance pattern of Korean 'Taebaek' was classified to same group with 'Jubilee' on the PCA and DFA results and its metabolite pattern was clearly discriminated by the PCA and PLS-DA compared to the other cultivars. These results show that the 14 peony cut flowers could be discriminated corresponding to their chemical relationship and the metabolic profile of Korean 'Taebaek' has distinctive characteristics. Furthermore, we suggest that these results could be used as the preliminary data for breeding new cut peony cultivars and for improving the availability of Korean cut peony in cosmetic industry.

• 한국환경복원기술학회지
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• 제6권4호
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• pp.43-51
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• 2003

임도의 절토비탈면의 각 조사구를 토양침식 및 붕괴발생의 발생 유무에 따라 안정구와 불안정구로 구분하고 절토비탈면의 안정에 영향을 미치는 인자를 도출하여 비탈면의 안정성을 평가한 결과는 다음과 같다. 1. 절토비탈면에서 발생한 토양침식량은 표고, 상부(사면위치), 볼록사면(凸), 사면경사, 비탈면길이, 사질식양토(SiL), 남쪽(South)사면과는 정의 상관을, 식생피복도, 평형사면(${\square}$), 미사질식양토(SiCL)와는 부의 상관관계를 보였다. 2. 절토비탈면의 안정성 판별에 대한 상대적 기여도는 식생피복도, 토양경도, 사면경사, 표고, 미사질양토, 볼록사면, 복합사면의 순으로 나타났다. 3. 절토비탈면에서 안정구(2)와 불안정구(1)의 중심값은 각각 -1.194와 1.127로 나타났으며, 이때 판별구분치는 -0.072이었다. 4. 절토비탈면 조사구의 불안정구와 안정구에 대한 판별능력의 적중율은 불안정구는 125개 중 117개가 판별됨으로서 93.6%의 적중율을, 안정구는 117개의 조사구 중 102개를 판별 시켜 87.2%의 적중율을 보였으며 두 그룹의 전체 판별능력은 90.4%였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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• pp.1-4
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• 1995

The most of conventional ultrasonic transducers are constructed to generate either longitudinal or shear waves, but not both of them. We investigated the mechanism of dual mode transducers that generates both of the longitudinal and shear waves simultaneously with a single PZT element. The study has been aimed to find the desired cut by the examining the piezoelectric properties. Theory predicts that a mixed P/S mode transducer can be constructed using a related Z-cut of a PZT ceramics. We studied the performance of a PZT element as a function of its rotation angle so that its efficiency is optimized to excite the two waves equally strongly. The results are verified by checking the impedance variation of the element with Finite Element Methods, and chocking the wave form by pulse-echo test simulation. Based upon the theory a rotated Z-cut was prepared and a transducer were fabricated. Validity of the theory calculation is verified through the

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.1100-1105
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• 2007

In the gas supply duct, the gas leakage caused by the impact of the construct equipment is serious problem. The identification of the impact position is an important issue and an engineering work. For the basic research of this problem, the principle studies for the acoustic wave propagation in a gas duct are proceeded in this paper. This principal work is based on the identification of the cut-off frequency associated with major modes of the gas duct theoretically and experimentally. The cut-off frequency is confirmed by STFT and cross-correlation function is used to identify the leakage position.

• 한국소음진동공학회논문집
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• 제18권8호
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• pp.797-804
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• 2008

In the gas supply pipe, the gas leakage caused by the impact of the construct equipment is serious problem. The identification of the impact position is an important issue and an engineering work. For the basic research of this problem, the principle studies for the acoustic wave propagation in a gas pipe are proceeded in this paper. This principal work is based on the identification of the cut-off frequency associated with major modes of the gas pipe theoretically and experimentally The cut-off frequency is confirmed by STFT and cross-correlation function is used to identify the leakage position.

• 한국강구조학회 논문집
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• 제8권4호통권29호
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• pp.19-29
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• 1996

In this paper, it is presumed that the stress time history was generated by simulation method and investigated compatibility in regard to the reappearance of stress time history. In this procedure, the identified frequency distribution of stress range of the steel railroad bridge varies with the rational values of cut off point and bar width. Thus, we show variable aspect of the equivalent stress range results from change of cut off point and bar width. In addition, we analyze the variable of RMC and RMS model due to the cut off point and bar width of the measured stress history which influencs the prediction of fatigue life in the steel railroad bridge. The simulated stress time history is carried out by the superposition method incorporating the vertical load with rotation moment obtained from the Hermition interpolation function, and compared with developing stress results from measured maxi mum stress. Through this study, we can estimate the remaining fatigue life from a safety point of view and comparative accuracy.