• Title/Summary/Keyword: troublesome

Search Result 381, Processing Time 0.025 seconds

Determination of the Modified Periodic Inspection Policy Using Nonparametric Appoximation (비모수적 근사를 이용한 수정된 정기검사정책의 결정)

  • 정해성
    • Journal of Korean Society for Quality Management
    • /
    • v.25 no.1
    • /
    • pp.173-181
    • /
    • 1997
  • A modified periodic inspection policy is examined. It is troublesome to know the life distribution and burdensome to compute an optimum planned inspection time numerically as well. A nonparametric a, pp.oximation is used so that equations for the optimum inspection time are expressed as closed forms. To show that the a, pp.oximation can be used in practice, simulations are conducted in the case of Weibull failure times.

  • PDF

In-situ Runout Idientification in Active Magnetic Bearing System by Extended Influence Coefficient Method (확장된 영향계수법을 이용한 능동자기베어링의 운전상황에서 측정체 진원도 오차 규명)

  • 김철순;이종원
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1995.10a
    • /
    • pp.154-159
    • /
    • 1995
  • In this study, an efficient, yet easy to use, in-situ runout identification scheme by using extended influence coefficient method is presented for active magnetic bearing(AMB) systems. It is shown experimentally that the proposed scheme successfully identifies and eliminates the troublesome runout of the well balanced AMB system in the laboratory so that a high precision spindle system can be achieved, while it is in operation.

  • PDF

A Study on D-Optimal Design Using the Genetic Algorithm

  • Yum, Joon-Keun
    • Communications for Statistical Applications and Methods
    • /
    • v.7 no.1
    • /
    • pp.357-370
    • /
    • 2000
  • This study has adapted a genetic algorithm for an optimal design for the first time. the models that was used a simulation are the first and second order response surfaces model, Using an genetic algorithm in D-opimal it is more efficient than previous algorithms to get an object function. Not like other algorithm without any restrictions like troublesome about the initial solution not falling into a local optimal solution it's the most suitable algorithm.

  • PDF

Fleshy Basidiomycetes in Mt. Jogye (조계산일대의 고등 담자균류)

  • 홍순우
    • Journal of Plant Biology
    • /
    • v.20 no.1
    • /
    • pp.29-44
    • /
    • 1977
  • During a week from 6th August in 1976 to survey the fungal flora on higher fleshy fungi around Mt. Jogye 193 specimens were collected and then examined tentatively. As a result fo identification except several troublesome ones it was known that they lie within 66 genera, 110 species, 3 varieties, and 2 forms. Out of them five genera, Eutypa, Sarcosoma in Ascomycetes, and Corticium, Heimiella, Clitopilus in Basidiomycetes were confirmed as unrecorded genera to Korea. And therefrom 26 species and 1 form corresponding almost to the fourth of sum were identified as unrecorded species to Korea, among which Basidiomycetes are provided with descriptions and figures in this survey report.

  • PDF

Systematic Coordinate Transformation between Different Projection Zones using GPS Survey Results (GPS성과를 매개로 한 구소삼각과 일반원점성과의 계통적 변환)

  • 김감래;최원준;임건혁
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
    • /
    • 2003.10a
    • /
    • pp.21-26
    • /
    • 2003
  • The fact on a variety of the plane coordinate systems in cadastral survey field caused a troublesome stage by different standards for the production of cadastral maps. The cadastral maps with different origins are not standardized in terms of unit and coordinate system, which introduces surveying problems at the edges where two or more zones meet. Moreover, difficulties in the creation of seamless digital cadastral map DBs between different coordinate systems has become the obstacle to establish various levels of spatial information systems for the efficient management of Korean Peninsula. Therefore, the aim of the study is to present a way to mutual coordinate transformation by clarifying the systematic differences between the areas of different origins.

  • PDF

A Developmental Study on the Wood-frame House Construction Method in Hilly Areas (구릉지형 목조주택의 시공기법 개발)

  • Choi, Jang-Soon
    • Journal of the Korean Institute of Rural Architecture
    • /
    • v.4 no.3
    • /
    • pp.53-62
    • /
    • 2002
  • This study aims at the development on the wood-frame house construction method in hilly areas. To obey the trend of public opinion to prohibit the troublesome development on a large scale in preparing housing sites, the small housing site development in hilly areas is on the rise and consequently wood-frame house which harmonized natural topography, geographical feature and environment in hilly areas is needed. The main contents are how to make housing sites, how to make roads, how to make pedestrian ways and surroundings of water to run downhill, how to locate house, how to make between road and house, how to view inner and outer and how to make retaining wall on the wood-frame house construction method in hilly areas.

  • PDF

Traffic flow measurement system using image processing

  • Hara, Takaaki;Akizuki, Kageo;Kawamura, Mamoru
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1996.10a
    • /
    • pp.426-439
    • /
    • 1996
  • In this paper, we propose a simple algorithm to calculate the numbers of the passing cars by using an image processing sensor for the digital black and white images with 256 tone level. Shadow is one of the most troublesome factor in image processing. By differencing the tone level, we cannot discriminate between the body of the car and its shadow. In our proposed algorithm, the area of the shadow is excluded by recognizing the position of each traffic lane. For real-time operation and simple calculation, two lines of the tone level are extracted and the existences of cars are recognized. In the experimental application on a high-way, the recognition rate of the real-time operation is more than 94%.

  • PDF

An Analysis Algorithm to Overcome the Singularity of Time Integrations for Dynamics Problems (동역학 문제의 시간적분 특이성을 극복하기 위한 해석 알고리듬)

  • 엄기상;윤성호
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 2004.04a
    • /
    • pp.1-8
    • /
    • 2004
  • For the linearized differential algebraic equation of the nonlinear constrained system, exact initial values of the acceleration are needed to solve itself. It may be very troublesome to perform the inverse operation for obtaining the incremental quantities since the mass matrix contains the zero element in the diagonal. This fact makes the mass matrix impossible to be positive definite. To overcome this singularity phenomenon the mass matrix needs to be modified to allow the feasible application of predictor and corrector in the iterative computation. In this paper the proposed numerical algorithm based on the modified mass matrix combines the conventional implicit algorithm, Newton-Raphson method and Newmark method. The numerical example presents reliabilities for the proposed algorithm via comparisons of the 4th order Runge-kutta method. The proposed algorithm seems to be satisfactory even though the acceleration, Lagrange multiplier, and energy show unstable behaviour. Correspondingly, it provides one important clue to another algorithm for the enhancement of the numerical results.

  • PDF

Optimization of Roller Levelling Process for Aluminum 7001 Pipes with Finite Element Method and Taguchi Method (유한요소해석과 다구찌 방법을 이용한 알루미늄 7001 소재 파이프의 Roller Levelling 공정 최적화)

  • Heo J. H.;Lee H. W.;Huh H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2001.10a
    • /
    • pp.106-109
    • /
    • 2001
  • Process parameters of roller levelling process are intermesh of each roller, roller angle, roller arrangement and shape of rollers. Experimental optimization of these process parameters is very troublesome because of difficulties in evaluating the straightness of pipes to be levelled quantitatively. Finite element method can be a very efficient way to evaluate the straightness of the pipes and therefore to optimize the process. This paper is concerned with simulation and optimization of a roller levelling process. Process parameters of a 14-roller levller for aluminum T9 pipes are optimized with finite element method and Taguchi method. Parameters of significance in roller levelling process and their optimum are obtained.

  • PDF

A Study on the Ubiquitous Interface Technologies (유비쿼터스 인터페이스 기술에 대한 고찰)

  • Lee, Hyeon-Jae;Oh, Chang-Heon
    • Journal of Digital Convergence
    • /
    • v.4 no.1
    • /
    • pp.31-41
    • /
    • 2006
  • This article introduces developing trends of an 'Ubiquitous Interface' as an access method for use of various network resources, such as public wireless networks and un-licensed wireless networks in ubiquitous sensor network environments, without troublesome settings or operations by users. 'Ubiquitous Interface' is a relatively wide sense meaning not only physical interface of specified device or between processors, but anything method for access USN. These 'Ubiquitous Interface' able to provide seamless services that adapt autonomously to the user's movements and changes in the state of wireless resources. Recently, strongly recommended current technologies are RFID, NFC, Multi-mode mobile terminal, UMA mobile terminal and Wearable computer as a future ubiquitous interface. These technologies are have to have flexibility and multiple physical communication channels for seamless service hand over and serve easy connection at huge USN to user. Also, they have to must have flexible software structure. Finally, through the 'Ubiquitous Interface', we will be experience of seamless communication and realize a real liberty of communication.

  • PDF