• 전기학회논문지
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• 제63권9호
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• pp.1266-1272
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• 2014

We define the mobile robot navigation problem as an optimization problem to minimize the cost function with the pose error between the goal position and the position of a mobile robot. Using Gauss-Newton method for the optimization, the optimal speeds of the left and right wheels can be found as the solution of the optimization problem. Especially, the rotational speed of wheels of a mobile robot can be directly related to the overall speed of a mobile robot using the Jacobian derived from the kinematic model. When the robot detects the obstacle using sensors, the sub-goal switching method is adopted for the efficient obstacle avoidance during the navigation. The performance was evaluated using the simulation and the simulation results show the validity of the proposed method.

• Journal of the Korean Data and Information Science Society
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• 제15권2호
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• pp.457-465
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• 2004

Ramik[7] introduced a fuzzy goal programming (FGP)problem that generalizes a standard goal programming (GP) problem with fuzzy alternatives, fuzzy objective functions and fuzzy deviation functions for measuring the deviation between attained and desired goals being fuzzy. However, it is known that this FGP tends to produce an approximate solution since it uses an approximate fuzzy multiplication operation to solve the resultant fuzzy model. In this paper, we show that this FGP sometimes leads to the wrong decision. We also propose a procedure that gets the exact solution to overcome these problems. The method is based on $T_M$ (min norm)-based fuzzy operations using $\alpha-cut$ representations. We consider the same example as used in Ramik and investigate how our procedures are compared to Ramik's.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.464-471
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• 2009

Robot and application of IT skill of construction industry are slow comparatively than another thing industry by the feature. This research proposes progress management and real time information gathering through construction automation and RFID focused on steel structure construction. Building for RTPM system, must consider various variables and surrounding situation in construction field and it is the most important and difficult matter that draw right requirement and grasp relation between this requirements to accomplish one suitable task considering these environment. Therefore, in this study analyzes requirement and target for RTPM system based on scenario that is easy to draw requirement and apply this to use case model. Presented method suggests that represent relation between goals and way that refines goal systematically from requirement of RTPM system. And it could express for visualization through the Way that attaches nonfunctional elements of system with system internal goal.

• 경영과학
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• 제28권1호
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• pp.141-158
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• 2011

This study concerns with an applicability of the management science approach to the score adjustment among the College Scholastic Aptitude Test(CSAT) optional subjects. A linear programming model is developed to minimize the sum of score distortions between optional subjects. Based on the analysis of the 377,089 CSAT(2010) applicants' performances in social science test section, this study proposes a new approach for the score equating or linking method of the educational measurement theory. This study makes up for the weak points in the previous linear programming model. First, the model utilize the standard score which we can get. Second, the model includes a goal programming concept which minimizes the gap between the adjusting goal and the result of the adjustment. Third, the objective function of the linear programing is the weighted sum of the score distortion and the number of applicants. Fourth, the model is applied to the score adjustment problem for the whole 11 optional subjects of the social science test section. The suggested linear programming model is a generalization of the multi-tests linking problem. So, the approach is consistent with the measurement theory for the two tests and can be applied to the optional three or more tests which do not have a common anchor test or a common anchor group. The college admission decision with CSAT score can be improved by using the suggested linear programming model.

• 한국게임학회 논문지
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• 제4권1호
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• pp.58-66
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• 2004

본 논문에서는 반례를 도달성 게임 풀이에 활용했다. 도달성 게임이란, 게임 규칙을 준수하면서 초기 상태에서 목표 상태로 가는 경로를 찾는 것이다. 게임의 초기 상태를 유한 상태 모델로 표현하고 목표 상태의 부정(오답)을 시제 논리식으로 표현해서 모델 검사기에 입력하면, 반례로 오답에 대한 부정 즉 정답을 출력한다. 다시 말해서 반례로 출력된 것이 문제를 해결하는 정답인 것이다. 이와 같은 아이디어를 푸쉬푸쉬 게임 풀이에 적용했다. 그 결과 크기가 작은 푸쉬푸쉬 게임의 경우 게임을 해결하는 최단 경로를 쉽게 찾아냈다. 그러나 게임의 크기가 큰 경우 제한된 시간(실험에서는 3시간)내에 찾아내지 못했다. 왜냐하면 게임의 크기가 커질 경우 검사해야할 상태의 수가 지수적으로 증가하는 상태 폭발 문제가 발생했기 때문이다. 상태 폭발 문제를 해결하기 위해 추상화 기법을 이용해서 검사해야 할 상태공간을 축소하였다. 상태 공간을 줄인 결과, 기존 모델체킹으로 해결하지 못했던 게임을 풀 수 있었다.

• 디지털융복합연구
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• 제12권11호
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• pp.225-232
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• 2014

네트워크와 통신의 발달로 스마트 디바이스의 보급이 이루어졌으며, 삶의 질을 높이기 위한 사람들의 열망이 커지면서 서비스 산업이 스마트 디바이스를 통해 이루어지고 있다. 그 중에서도 사람들의 건강한 삶을 위해 행동을 변화할 수 있도록 도와주는 서비스가 일반적인 프로세스로 개발되어져 행위자의 행동 변화에 대해 많은 영향을 미치지 못한다. 따라서 본 연구는 애플리케이션 마켓을 통해 현재 행동변화 애플리케이션에 대한 개발 상황을 알아보았다. 개발현황에는 프로세스에 의해 2가지 패턴으로 나눌 수 있다. 이 결과와 행동 이론 모델인 통합변화모델, 목표설정이론의 목표 수행 과정과 이를 자동화시키기 위한 습관형성단계를 사용한 행동변화모델을 제시한다. 또한, 모델에 따른 서비스를 제시하여 행위자에게 동기력 및 행동의 지속가능성과 긍정적으로 행동 변화가 이루어 질 수 있도록 한다. 이렇게 구성함으로써 기존의 서비스보다 행동력 동기력 등 여러 측면에서 기대할 수 있을 것이다.

• 한국과학교육학회지
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• 제16권4호
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• pp.365-375
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• 1996

Improving of scientific inquiring ability is the major goal of current science curriculum, and the 6th science curriculum. But science educators consider that the existing textbooks and teaching manuals are insufficient to achieve this goal. For science teachers at teaching site to guide students efficiently in research work, development of teaching-learning programs is urgently demanded. Hypothesis Verification Learning Model(HVLM) was applied to classroom situation to improve ability of scientific inquiry in experiment teaching of middle school biology. The effects of the model were analyzed to suggest some approach method to reach the goal of science education in this study. The major results of this study are as following: 1. The students and teachers responded positively on this new learning model. an students were willing to participate in biology experiment and they said that to know what was unknown to them while exchanging ideas and opinions through the discussion, It was hard for teachers to instruct at the first time and it took much time for them to arrange materials ready, but it turned to be easier as time went on. 2. In science process skills, there was no significant difference statistically by new leaning model. Only the formulating a generalization or model showed significant difference statistically between the two groups. 3. For scientific attitude, experimental group did not show significant difference statistically between the two groups, but the experimental group showed statistically more significant positiveness in all areas afterwards than before. 4. In science achievement test, there was significantly higher than the control group. It is also analyzed that they remember the experiments in courses and results they planned and performed by themselves longer than these guided by teachers.

• 컴퓨터교육학회논문지
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• 제7권5호
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• pp.9-21
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• 2004

인터넷이라는 새로운 IT기술을 교육현장에서 적극적으로 활용해야 한다는 강한 요구에도 불구하고 웹기반 교육의 정착은 미흡한 실정이다. 그 원인은 현재 웹기반 교육이 전통적 교실수업과 질적으로 다르지 않고 웹기반 교육에 적합한 설계모형들이 충분히 개발되지 않았기 때문이다. 본 연구자들은 구성주의 학습관에 기반한 GBS 설계모형을 이용하여 도서관 이용에 관한 웹기반 교육용 컨텐츠를 개발함으로써 웹기반 교육을 개발하거나 활용하고자 하는 교사와 교육실천가들에게 구체적인 개발사례를 제공하고자 한다. 3개월 간 요구분석, 학습내용분석, 학습자 및 학습환경분석을 통해서 GBS모형을 적용한 웹기반 교육용 컨텐츠를 설계하고 GBS의 7가지 구성요소들에 충실하게 개발하였다. 본 연구의 결과들은 학교와 기업에서 새로운 형태의 웹기반 교육을 개발하고자 하는 실천가들에게 구체적인 가이드를 제공해줄 것이다.

• 산업경영시스템학회지
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• 제40권4호
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• pp.96-104
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• 2017

A one-shot system (device) refers to a system that is stored for a long period of time and is then disposed of after a single mission because it is accompanied by a chemical reaction or physical destruction when it operates, such as shells, munitions in a defense weapon system and automobile airbags. Because these systems are primarily related with safety and life, it is required to maintain a high level of storage reliability. Storage reliability is the probability that the system will operate at a particular point in time after storage. Since the stored one-shot system can be confirmed only through inspection, periodic inspection and maintenance should be performed to maintain a high level of storage reliability. Since the one-shot system is characterized by a large loss in the event of a failure, it is necessary to determine an appropriate inspection period to maintain the storage reliability above the reliability goal. In this study, we propose an optimal inspection policy that minimizes the total cost while exceeding the reliability goal that the storage reliability is set in advance for the one-shot system in which periodic inspections are performed. We assume that the failure time is the Weibull distribution. And the cost model is presented considering the existing storage reliability model by Martinez and Kim et al. The cost components to be included in the cost model are the cost of inspection $c_1$, the cost of loss per unit time between failure and detection $c_2$, the cost of minimum repair of the detected breakdown of units $c_3$, and the overhaul cost $c_4$ of $R_s{\leq}R_g$. And in this paper, we will determine the optimal inspection policy to find the inspection period and number of tests that minimize the expected cost per unit time from the finite lifetime to the overhaul. Compare them through numerical examples.

• 지식경영연구
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• 제20권3호
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• pp.173-193
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• 2019

Reward-based crowdfunding is a funding platform that allows funds to be raised to early operators who have lack of funds, and is seen as an outstanding infrastructure that is going to lead the fourth industrial revolution in that it is a field of realization of new technologies and creative ideas by start-ups. Reward-based crowdfunding has grown in line with the trend of the fourth industrial revolution, and funding success cases are taking place in various industries that culture/art to technology/IT, including as a new means of knowledge management in a rapidly changing industrial environment. The study focused on the fact that consumer's donation purposes may also vary depending on the category of projects classified as reward-based crowdfunding. Because consumer payment decisions and motivation of consumer purchasing behavior are classified according to the purpose of purchase, the previous papers that the goal gradient effect that the main motivation of consumer donation for reward-based crowdfunding introduced vary depending on project category of utilitarian and hedonic. In this study, consumer's daily donation data is collected by Indiegogo which is a leading reward-based crowdfunding company using web-crawling and the model was defined as propensity score matching (PSM) and random effect model. The results showed that the goal gradient effect occurred in utilitarian project category, but no goal gradient effect for the hedonic project category. Furthermore, this paper developed the study of motivation of consumer donation and contributes theoretical foundation by the results consumer donation may vary depending on the project category; also, this paper has implications for an effective marketing strategy depending on the project category leaves real meaning to the projector.