• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.59.5-59
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• 2001

Multi-agent robot system is the system which executes by cooperating with each robots and controlling several robots. Capability and function of each robot must be considered for cooperation behavior. Furthermore, it is necessary to analyze the given environment and to replace complex task with some simple tasks. Analysis of the given environment and role assignment for the given tasks are composed of discret event. In this paper, the hierarchical controller for multi-agent robot system using the petri-net state diagram is proposed. The proposed modeling method is implemented for soccer robot system. The effectiveness of proposed modeling method is shown through experiment.

• Journal of Korean Society of Transportation
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• v.25 no.3
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• pp.111-121
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• 2007

A transit assignment model can forecast the behaviors of transit users. thereby playing an important role In the evaluation of transit policies. Most existing transit assignment models are based on the models for passenger cars; therefore they cannot reflect the specific characteristics of transit modes. In addition most of the existing models are based on a single transit mode (bus or rail), and they cannot forecast the behaviors of transit users in a changing mass transportation system. The goal of this study is to overcome these problems with the exiting models and to develop a more realistic model. The newly developed model is based on mixed transit modes and is a stochastic model that can reflect the different preferences of each transit user for travel time and transfering. Data gathered from the Seoul metropolitan area's smart card are used to calibrate this model. This study is expected to be used for the evaluation of transportation policies and to attribute the development of transit revitalization strategies.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.10
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• pp.947-955
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• 2004

This paper is concerned with a mixed control with aerodynamic fin and side thrust control applied to an agile missile using a dynamic inversion and a time-varying control technique. The nonlinear dynamic inversion method with the weighting function allocates the desired control inputs(aerodynamic fin and side thrust control) to achieve a reference command, and the time-varying control technique plays the role to guarantee the robustness for the uncertainties. The proposed schemes are validated by nonlinear simulations with aerodynamic data.

• Annual Conference of KIPS
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• 2005.05a
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• pp.1205-1208
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• 2005

구조적 문서에 대한 접근제어를 위해서 필수적으로 보안 계층에 대한 문제가 고려되어야 한다. 본 논문에서는 사용자가 가지는 보안계층, 즉 사용자 역할 계층에서의 접근제어 문제를 해결하기 위한 효율적인 키 관리 방법을 제안한다. 본 논문에서 제안된 방법은 OWHF(One-way Hash Function)를 이용하여 효과적으로 키를 할당하고 유도한다. 제안된 방법을 역할 계층 트리에서 역할의 추가와 삭제, 역할 계층의 갱신과 같은 동적 접근제어 문제에 적용하고 이를 분석한다.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.940-945
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• 2009

This paper presents the design method of low order controller for the active pantograph of electric train system. The pantograph is the most playa role to supply constant current to the train. The design objectives are to have good tracking performance about reference contact force despite the stiffness variation that is like sinusoidal function concerned in train speed or span length of contact wire. In this paper, we consider stiffness variation from external disturbance of active pantograph to simplify model equation, and propose simple second-order controller which is designed by Characteristic ratio assignment(CRA) control method. Finally, we verify time response appling to model equation of real system and frequency response about parameter uncertainty like stiffness variation. it is performed by Matlab version 6.5 and Matlab simulink simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.5
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• pp.565-573
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• 2016

Wi-Fi Direct standard technology(Wi-Fi Peer to Peer Technical Specifications v1.2, 2010) was designed for allowing peer to peer communication between two or more devices and various products which have been currently manufactured such as smart phone and smart TV have already provided this technical function. In this technology the role of Coordinator in Wi-Fi infrastructure would be matched to GO(Group Owner) which needs relatively high energy resource and computation power due to the high probability for allowing 3rd-party connection, however, the current standard specification would be limited in terms of energy distribution because it has not included a process to determine the role of GO. To address above problem, this paper classified considerable parameters into the general parameters for the physicality of devices and the specific parameters for considering the role position depending on use-case scenario, and proposed a new method called DIVA to help efficiently determining GO role from the member devices of Wi-Fi Direct network. Furthermore the effect of this mechanism was proved via simulation-based experiments.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.283-288
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• 2007

As constructions are changing variously from the size and efficiency, the role of supervision services tend to reach beyond mere monitoring or supervision to prevent fraudulence, but tend to extend toward a system that manages all the stages of the construction industry. There are growing demand to improve government operated corporation systems to secure high quality public facilities, and reviews on construction supervision system and supervision services roles, function, responsibility and obligations have been the topics among advanced researchers. However, the circumstance is that researches on the construction supervision service compensation and supervision services assignment criteria that serve as basis of such construction supervision system improvement are insufficient, and for practical development of construction supervision system, researches on construction supervision service compensation and supervision services assignment criteria will need to precede. Hence, this research purports to propose improvement directions of construction supervision system by deducing problems through condition survey on the construction supervision services ordered by public organizations.

• The KIPS Transactions:PartD
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• v.8D no.5
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• pp.516-572
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• 2001

Geographic Information System(CIS) deal with data which can potentially be useful for a wide range of applications. The information needed by each application can be vary, specially in resolution, detail level, application view, and representation style, as defined in the modeling phase of the geographic database design. To be able to deal with such diverse needs, GIS must offer features that allow multiple representation for each geographic entity of phenomenon. This paper addresses on the problem of formal definition of the objects and their relationships on the geographical information systems. The geographical data is divided into two main classes : geo-objects and geo-fields, which describe discrete and continuous representations of spatial reality. I studied the attributes and the relationship roles over geo-object and nongeo-object. Therefore, this paper contributed on the efficient design of geographical class hierarchy schema by means of formalizing attribute-domains of classes.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.539-550
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• 2017

The purpose of this study was to investigate the differences in family cohesion and family adaptability between college students and their parents to identify the factors that affect family cohesion and family adaptability using a descriptive research study design. The subjects of this study were 197 college students and their parents. The data were analyzed using descriptive statistics, the t-test, ANOVA, correlation and multiple regression analysis by SPSS for Windows (ver. 22.0). The mean of the family function index of the subjects was $7.42{\pm}2.28$ on the scale of 1 to 10, and that of the normal family functional group was 65.48%. There was no significant difference in family cohesion between the college students and their parents, and family adaptability was significantly different in discipline(t=-3.100, p<.01) and role(t=.212, p<.05). The factors affecting the family adaptability of the students were the sharing of family activities, emotional intimacy and attending family events, which showed a combined explanatory power of 45.9%. The factors affecting the family cohesion of the parents were housework assignment, emotional intimacy and attending family events, which showed a combined explanatory power of 51.4%. Family emotional intimacy and attending family events, as well as the sharing of family activities, were found to be important to the family adaptability of the college students and housework assignment was found to be important to the family cohesion of the parents.

• Journal of Convergence for Information Technology
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• v.8 no.5
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• pp.69-75
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• 2018

The purpose of access control is to prevent computing resources from illegal behavior such as leakage, modification, and destruction by unauthorized users. As the cloud computing environment is expanded to resource sharing services using virtualization technology, a new security model and access control technique are required to provide dynamic and secure cloud-based computing services. The virtualization management convergence access control model provides a flexible user authorization function by applying the dynamic privilege assignment function to the role based access control mechanism. In addition, by applying access control mechanism based on security level and rules, we solve the conflict problem in virtual machine system and guarantee the safeness of physical resources. This model will help to build a secure and efficient cloud-based virtualization management system and will be expanded to a mechanism that reflects the multi-level characteristics.