• 제어로봇시스템학회논문지
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• 제12권5호
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• pp.473-479
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• 2006

A global path planning algorithm using modified self-organizing feature map(SOFM) which is a method among a number of neural network is presented. The SOFM uses a randomized small valued initial weight vectors, selects the neuron whose weight vector best matches input as the winning neuron, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. On the other hand, the modified method in this research uses a predetermined initial weight vectors of the 2-dimensional mesh, gives the systematic input vector whose position best matches obstacles, and trains the weight vectors such that neurons within the activity bubble are move toward the opposite direction of input vector. According to simulation results one can conclude that the modified neural network is useful tool for the global path planning problem of a mobile robot.

• 영어어문교육
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• 제10권1호
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• pp.179-200
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• 2004

The purpose of this study is to investigate the adequacy of derivational approach and representational approach to syntactic theories in generative grammar. As the generative grammar is based on the derivational process of syntactic theories, it is suggested that derivational approach is more valid than representational approach. Move, Economy Principle, Local Economy and Label-free Phrase Structure in Minimalist framework support the preference of derivational approach to representational approach with the elimination of computational complexity, minimality, and label-free phrase structure. Syntactic structure is considered as the result of the interaction of the properties of lexical items containing probe and economy conditions constrained by bare output conditions. On the other hand, Pseudogapping in Lasnik(1999) is analyzed in terms of Object Shift, that is, overt raising to Spec of $Agr_o$ and the PF deletion of VP in representational approach. Hence, it is suggested that the combination of derivational and representational approaches to syntactic theories can be admitted in generative grammar.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.816-821
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• 2004

The outlet feeder pipe thinning in a PHWR (Pressured Heavy Water Reactor) is caused by high pressure steam flow inside the pipe, which is a well known degradation mechanism called FAC (Flow Assisted Corrosion). In order to monitor the degradation, the thickness of the outlet bends closed to the exit of the pressure tube should be measured and analyzed at every official overhaul. This paper develops an automatic feeder pipe inspection system that can minimize the irradiation dose by automating the measurement process. The robot can move by itself on the feeder pipe by using an inch worm mechanism, which is constructed by two gripper bodies that can fix their body on the pipe and one extendable and retractable body connected the two gripper bodies to move forward and backward.

• 한국주거학회논문집
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• 제10권3호
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• pp.213-220
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• 1999

The purpose of this study was to find the degree of satisfaction of the Korean elderly with their existing residential environment and their propensity to move. The data were collected through interviews and structured questionnaires. The subjects were 1,200 nationwide elderly over the age of 60 selected by probability sampling proportionate to size. cluster and random sampling method. The data were analyzed with frequency. percentage. and $X^2$-test using the SAS package. The major findings were as follows: Most subjects were satisfied with their housing environment and had no intention of moving. The subjects were highly satisfied with their residential environment. did not tend to move. This result does not necessarily mean that there is no need for better housing and no need to design elderly housing in Korea. It implies the need for community integrated housing development with flexible service system.

• 대한전기학회논문지
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• 제40권2호
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• pp.207-216
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• 1991

In the case that the robot manipulator should respond to the variance and uncertainty of the environment in performing preforming precision tasks, it is indispensable that the robot utilizes the various sensors for intrlligence. In this paper, the robot force control method is implemented with a force/torque sensor, two personal computers, and a PUMA 560 manipulator for performing the various application tadks. The hybrid position/force control method is used to control the force and position axis separately. An interface board is designed to read the force/torque sensor output into the computer. Since the two computers should exchange the information quickly, a common memory board is designed. Before the algorithms of application tasks are developed, the basic force commands must be supplied. Thus, the MOVE-UNTIL command is used at the discrete time instant and, the MOVE-COMPLY is used at the continuous time instant for receiving the force feedback information. Using the two basic force commands, three application algorithms are developed and implemented for edge-following, insertion, and grinding tasks.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2753-2755
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• 2003

Overhead crane must do to control occurrence of Anti-Sway according to work situation that is used in case move industry spot's heavy freight, and do safe transfer of freight. Transfer process that make use of crane suspends and consist of series action that put down freight to do relevant addition decreasing the speed before objective while move by schedule section equal speed because increasing the speed after lift thing. This need skill degree by experience because there are operator's function and affinity. Also, must control this effectively because can affect big productivity elevation according to effect that get in transfer of safe freight, Therefore, illuminate physical characteristic of crane and algorithm of motor drive department and there is purpose of this research to do so that correct control may be available through over head crane's shaking control and position control designing LQ controller.

• 한국위성정보통신학회논문지
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• 제12권2호
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• pp.38-41
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• 2017

이동형 위성단말의 운용 환경에서는 장애물로 수신 성능이 감소한다. 하나의 방법으로 Diversity를 적용하여 수신 성능을 향상시킬 수 있다. 본 논문에서는 Diversity방법 중 Equal Gain Combining(EGC)방식과 Selective Combining(SC)방식을 적용하여 성능을 분석한다. 분석을 위해 이동형 위성단말로 측정한 결과를 활용한다. 분석결과 SC방식을 사용 시 성능향상을 확인할 수 있었다. 하지만 EGC방식은 rural지역에선 성능향상을 보이지만, urban지역에서는 성능이 나빠지는 결과를 확인할 수 있었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.72-73
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• 2007

The charged particle have characteristics of high-contrast ratio and wide-view angle, quick-response time. When positive voltage is applied to the upper electrode, the yellow particles with negative charge move toward the upper substrate and the black particles with positive charge move toward opposite direction. We have developed the putting method that can fill particles in cell of panel and control the amount of charged particles. We investigated putting method, fabrication process, aging and driving for charged particle type display.

• Journal of Advanced Marine Engineering and Technology
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• 제22권4호
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• pp.505-514
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• 1998

Flow pattern of air-water two phase flow depends on the conditions of pressure void fraction and channel geometry. We classify the flow pattern by measuring the output signal of the conductivity probe. under the classified flow pattern we mount a visualization equipment on the test section and take pictures. We vary the concentration of pure solvent and polymer to measure local void fraction. We know that the maximum point position of local void fraction distribution move from the center of the pipe to the wall of the pipe as JSL increase when JSA is constant in two phase flow. But we find that the maximum point position of local void friction move from the wal of the pipe to the center of the pipe when polymer concentration increase.

• 한국정밀공학회지
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• 제22권5호
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• pp.95-102
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• 2005

The coordination of locomotion and manipulation has been the typical and main issue for a mobile manipulator. This is particularly because the solution for the control parameters is redundant and the accuracies of controlling the each joints are different. This paper presents a motion planning method for which the mobile base locomotion is less precise than the manipulator control. In such a case, it is appropriate to move the mobile base to discrete poses and then to move the manipulator to track a prescribed path of the end effector, while the base is stationary. It uses a variant of the conventional manipulability measure that is developed for the trajectory control of the end effector of the mobile manipulator along an arbitrary path in the three dimensional space. The proposed method was implemented on the simulation and the experiments of a mobile manipulator and showed its effectiveness.