• 국제초고층학회논문집
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• 제8권4호
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• pp.283-290
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• 2019

Corner cut, corner chamfered or a building shape change are adopted in the design of tall buildings to achieve aerodynamic superiority as well as response reduction. Kikuchi et.al pointed out that large negative peak external pressures can appear near the inside corner of set-back low rise buildings. It is therefore necessary to pay attention to facade design around steps in building surfaces. Peak wind pressures for corner cut or corner chamfered configurations are given in the AIJ code. However, they cannot be applied where there are many variations of vertical and horizontal steps. There has been no previous systematic research on peak wind pressures around steps in building surfaces. In this study, detailed phenomenon of peak wind pressures around steps in buildings are investigated focusing on vertical and horizontal distances from the building's corner.

• Communications for Statistical Applications and Methods
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• 제11권2호
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• pp.369-380
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• 2004

Clustering algorithms with different similarity measures are commonly used to find an optimal clustering or close to original clustering. The recovery level of using Euclidean distance and distances transformed from correlation coefficients is evaluated and compared using Rand's (1971) C statistic. The C values present how the resultant clustering is close to the original clustering. In simulation study, the recovery level is improved by applying the correlation coefficients between objects. Using the data set from Spellman et al. (1998), the recovery levels with different similarity measures are also presented. In general, the recovery level of true clusters was increased by using the correlation coefficients.

• 비파괴검사학회지
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• 제32권3호
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• pp.241-262
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• 2012

Some applications require structural health monitoring in inaccessible components. This paper presents a technique useful for Structural Health Monitoring of double wall structures, such as double wall steam pipes and double wall pressure vessels separated from an ultrasonic transducer by three layers. Detection has been demonstrated at distances in excess of one meter for a fixed transducer. The case presented here is for one of the layers, the middle layer, being a fluid. For certain transducer configurations the wave propagating in the fluid is a wave with low velocity and attenuation. The paper presents a model based on wave theory and finite element simulation; the experimental set-up and observations, and comparison between theory and experiment. The results provide a description of the technique, understanding of the phenomenon and its possible applications in Structural Health Monitoring.

• 대한산업공학회지
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• 제13권1호
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• pp.11-24
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• 1987

Automatic Guided Vehicle Systems feature battery powered driverless vehicles with programming capabilities for path selection and positoning. Vehicles serve the machines in shop, following a guide path system installed on the shop floor. The basic problem in the system is to determine a fixed set of vehicle routes of minimal total distance(time) while keeping capacity and distance(time) constraints. In this paper, a heuristic algorithm is presented for scheduling the automatic guided vehicles. The algorithm routes the machines based on their distances and polor coordinate angles, taking into account the structural feature of the system. Computational experiments are performed on several test problems in order to evaluate the proposed algorithm. Finally, a framework for dealing with the case where supplies from the machines are probabilistic is described.

• 산업공학
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• 제13권2호
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• pp.195-203
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• 2000

This paper considers the problem of sequencing printed circuit boards(PCBs) on an automatic surface mount device(SMD) placement machine in order to minimize total setup time. Since the total set of component feeders needed by all boards cannot be loaded simultaneously on the magazine, the setup must be made between two successive boards in the sequence. It is assumed that the setup time depends on the number of component feeders to be replaced in the magazine. An important characteristic is that each feeder occupies a different number of slots in the magazine. This problem is equivalent to travelling salesman problem(TSP) except that the distances between two cities, that is, the setup times between two boards, are not known in advance. So, TSP-based heuristics with new distance functions are presented and their performances are compared through various test problems. Computational results indicate that our heuristics outperform existing methods.

• 산업공학
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• 제1권2호
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• pp.45-52
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• 1988

Telecommunication networks include repeaters that serve to monitor the condition of each line within the network, and a center that dispatches repairmen to fix broken repeaters. In such a set-up, however, a problem arises : where is the most effective location for the center? First of all, we consider the network problem in which the nodes are the telephone offices and the arcs are the transmission lines. Here we deal with the center location problem in which the center must be located at a node and calls for service are assumed to occur on the arcs. This thesis proposes to prove that this problem can be transformed into a 1-median problem. Furthermore, the transformed problem will be proven to be equivalent to the center location problem that minimizes the sum of the distances weighted by the degrees of each node.

• 대한치과교정학회지
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• 제45권5호
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• pp.236-244
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• 2015

Objective: The aim of this study was to investigate three-dimensional molar displacement after distalization via miniscrews and a horizontal modification of the trans-palatal-arch (TPA). Methods: The subjects in this clinical trial were 26 Class II patients. After the preparation of a complete set of diagnostic records, miniscrews were inserted between the maxillary 2nd premolar and 1st molar on the palatal side. Elastic modules connected to the TPA exerting an average force of 150-200 g/side parallel to the occlusal plane were applied. Cone-beam computed tomography was utilized to evaluate the position of the miniscrews relative to the adjacent teeth and maxillary sinus, and the direction of force relative to molar furcation. The distances from the central point of the incisive papilla to the mesiopalatal cusps of the 1st maxillary molars and the distances between the mesiopalatal cusps of the left and right molars were measured to evaluate displacement of the maxillary molars on the horizontal plane. Interocclusal space was used to evaluate vertical changes. Results: Mean maxillary 1st molar distalization was $2.3{\pm}1.1mm$, at a rate of $0.4{\pm}0.2mm/month$, and rotation was not significant. Intermolar width increased by $2.9{\pm}1.8mm$. Molars were intruded relative to the neighboring teeth, from 0.1 to 0.8 mm. Conclusions: Distalization of molars was possible without extrusion, using the appliance investigated. The intrusive component of force reduced the rate of distal movement.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.195-199
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• 2008

We present an approach to detect real plane for line base recognition and pose estimation Given 3D line segments, we set up reference plane for each line pair and measure the normal distance from the end point to the reference plane. And then, normal distances are measured between remains of line endpoints and reference plane to decide whether these lines are coplanar with respect to the reference plane. After we conduct this coplanarity test, we initiate visibility test using z-buffer value to prune out ambiguous planes from reference planes. We applied this algorithm to real images, and the results are found useful for evidence fusion and probabilistic verification to assist the line based recognition as well as 3D pose estimation.

• 한국컴퓨터정보학회논문지
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• 제18권1호
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• pp.83-91
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• 2013

인간의 많은 작업이 컴퓨터를 이용하여 수행됨에 따라 HCI(Human-Computer Interaction)에 대한 연구가 활발히 진행되고 있다. HCI 연구의 한 가지 목표는 좀 더 일관성 있는 시스템의 설계를 제안하는 것이다. 사용자의 관점에서 일관성을 평가하기 위한 대표적인 인지모형으로 TAG(Task Action Grammar), GOMS(Goals - Operators - Methods - Selection Rule), 그리고 GTN(General Transition Network)이 있다. 이 중 TAG는 규칙스키마의 개수를 가지고 시스템의 일관성을 평가한다. 즉, 사용자가 시스템을 이용하여 작업을 할 때 익혀야 할 규칙스키마의 개수가 적으면 적을수록 그 시스템의 일관성은 높다는 것이다. 이 논문에서는 TAG에서 시스템의 일관성을 측정할 때 단순히 규칙스키마의 개수뿐만 아니라 규칙스키마 사이의 거리도 역시 중요한 고려 대상이 되어야 한다는 것을 보이고자 한다. 즉, 규칙스키마 사이의 거리가 짧으면 짧을수록 모든 규칙스키마를 습득하기가 쉬워질 것이다. 실험결과 이 가설은 확인되었다. 따라서 시스템을 설계할 때 규칙스키마의 개수뿐만 아니라 규칙스키마 사이의 거리도 고려되어야 할 것이다.

• 대한교통학회지
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• 제26권3호
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• pp.67-74
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• 2008

현재 시행 중인 지점단위 사고잦은곳 개선사업은 매년 효율성이 저하되고 있으나, 효율성 제고방안으로 제기되고 있는 구간단위 개선사업은 방법론에 있어 아직까지 구체적인 방안이 제시되지 못하고 있는 실정이다. 이에 본 연구는 일반국도를 대상으로 개선사업 및 미개선사업 지점으로 부터 사업 차년도 신규 사고잦은곳에 이르는 거리자료를 분석하여, 적정 개선사업 구간길이 및 구간설정 방안을 제시하고자 하였다. 거리자료 분석결과, 개선사업을 실시한 교차로로부터 2Km 내 신규 사고잦은곳이 발생할 확률이 미개선 교차로 지점에 비해 높은 것으로 나타났으나 개선사업 내역별 거리분포 차이는 미미한 것으로 나타났다. 최종적으로, 상호 인접거리가 2km내에 있는 일련의 사고잦은곳을 포함하는 구간을 개선사업 후보구간으로 선정하는 방안을 제시하였다.