• 한국IT서비스학회지
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• 제10권2호
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• pp.309-327
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• 2011

Even though several methodologies for SOA(Service Oriented Architecture) have been proposed, in practical aspects most of them have some problems since they fail to propose specific policies in definition and identification of a service. This paper proposes a service modeling methodology. SOMO(Service Oriented Modeling using Ontology), which draws proper services in the process of defining and identifying services. SOMO defines a service ontology based on service definition and characteristics in SOA. The service drawing process consists of 3 steps : requirement analysis, service identification, and service definition. SOMO is expected to increase the degree of reuse and facilitates the definition and search of services by using service ontology. In addition, it clearly allows the definition and identification of services, satisfying the user requirements.

• 융복합기술연구소 논문집
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• 제4권2호
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• pp.1-9
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• 2014

This paper examines feature-based reconstruction algorithm using feature-based modeling and based on topology optimization technology, which aims to achieve a minimal volume weight and to satisfy user-defined constraints such as stress, deformation related conditions. The finite element model after topology optimization allows us to remove some region of a solid model for predefined volume requirement. The stress or deformation distribution resulted from finite element analysis enables us to add some material to the solid model for a robust structure. For this purpose, we propose a feature-based redesign algorithm which inserts negative features to the solid model for material removal and positive features for material addition, and we introduce a bisection method which searches an optimal structure by iteratively applying the feature-based redesign algorithm. Several examples are considered to illustrate the proposed algorithms and to demonstrate the effectiveness of the present approach.

• 전자공학회논문지A
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• 제31A권10호
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• pp.10-20
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• 1994

This paper presents a CATV SMS (Status Monitoring System) using HDLC (High Level Data Link Contorl) protocol and the system implementation.The system specifications were derived from the analysis of technical status and requirement of the domestic CATV industry. For the interoperability with a global network management system in the future, HDLC protocol was adopted in the system. The system performance was improved by using the communication controller chip and the large data buffer. For reducting the communication problems induced by accumulated noise in up-stream data channels, the system was designed that the different communication channel can be assigned to each proper mass of terminal. The operating software was designed with menu driven user interface and have various functions for the convenience of users. The test result of the implemented system at the experimental network showed good performance and suitability for a coaxial CATV Status Monitoring System.

• 한국사이버테러정보전학회:학술대회논문집
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• 한국사이버테러정보전학회 2004년도 제1회 춘계학술발표대회
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• pp.35-42
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• 2004

유비쿼터스 컴퓨팅(Ubiquitous Computing)은 많은 분야의 실생활에서 적용이 되고 있다 이미 각 선진국에서는 좀 더 사용자들에게 편리한 유비쿼터스 환경을 제공하기 위해 유비쿼터스에 대한 다양한 연구를 추진 중 이다. 언제 어디서나 사용자가 원하는 정보와 서비스를 제공받을 수 있다는 이점이 있지만 다른 한편으로는 유비쿼터스 네트워크의 취약점을 이용한 여러 가지 공격 즉 Rogue AP, If spoofing, DoS 등의 공격에 사회적으로 큰 혼란을 가져올 수 도 있다. 이에 본 논문에서는 유비쿼터스 컴퓨팅 네트워크 환경에서의 보안요구 사항등을 분석해보고 유비쿼터스 컴퓨팅 환경의 네트워크 인프라 구축을 위한 핵심기술인 무선 'Ad hoc' 와 RFID에 대해 연구하고자 한다. 연구하고자 한다.

• 한국초전도ㆍ저온공학회논문지
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• 제17권3호
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• pp.62-66
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• 2015

The cryostat is designed for the superconducting quadrupole magnets to be used in a heavy-ion accelerator facility. The main accelerator is superconducting linac, which can accelerate a $^{238}U$ beam to 200 MeV/u (Mega electron voltage per nucleon). The cryostat for the magnet employs an innovative design primarily driven by the requirement of the compactness, user-friendliness and reliability. Also, several ancillary requirements such as background field, space restriction due to the beam line and cryostat structure need technical attentions. The development of the cryostat for three quadrupole magnets in the in-flight fragmentation separator is presented in the paper. The concept of cryogenic design is reported and the amount of cryogenic load is estimated by a relevant analysis. The structure of the cryostat to endure the heavy iron yoke including three quadrupole magnets is presented. In addition, the design as well as the performance test of the support link for the cold mass is described.

• 대한임베디드공학회논문지
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• 제4권2호
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• pp.50-54
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• 2009

In this paper, we address a novel system-level power management technique which is specifically targeted for an ARM 11 MPCore system. Our proposed solution is a DPM technique which includes process monitoring, real time power analysis, and policy application to reduce the power consumption while meeting the performance requirement. One of the main contributions of this paper is that we systematically infer QoS requirements of processes without getting any additional information from the application. When multiple processes are running under various user level policies, priorities of the policy application are determined in such a way that the overall system performance is maintained while power consumption is effectively managed. Experimental results show that our DPM technique is very effective in reducing power consumption without violating system's QoS requirements.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.447-451
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• 2009

Metropolitan rapid transit has been used by one of a main transport service for several decades, but there are no monitoring system for electrical equipment condition which can cause enormous economic loss and social problem if fault occurs. Recently, necessity of condition monitoring system for electrical equipment fault came to the fore, we became carrying out a research project for a design of electrical equipment lifetime estimation system for metropolitan rapid transit. In this paper, basic design result of condition monitoring system and specification of transformer partial discharge detection system are presented, which are part of entire lifetime estimation system. Definition of target apparatus and monitoring method determined by analysis of user requirement from each railway company and, each railway company's opinions and requests were collected sufficiently by surveys and discussion.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 춘계학술발표회논문집(1)
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• pp.335-340
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• 1998

In this paper a prototype of Requirement Tracking and Verification System(RTVS) for a Distributed Control System was implemented and tested. The RTVS is a software design and verification tool. The main functions required by the RTVS are managing, tracking and verification of the software requirements listed in the documentation of the DCS. The analysis of DCS software design procedures and inter(aces with documents were performed to define the user of the RTVS, and the design requirements for RTVS were developed.

• 융합보안논문지
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• 제5권4호
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• pp.59-65
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• 2005

유비쿼터스 컴퓨팅(Ubiquitous Computing)은 많은 분야의 실생활에서 적용이 되고 있다. 이미 각 선진국에서는 좀 더 사용자들에게 편리한 유비쿼터스 환경을 제공하기 위해 유비쿼터스에 대한 다양한 연구를 추진 중이다. 언제 어디서나 사용자가 원하는 정보와 서비스를 제공받을 수 있다는 이점이 있지만 다른 한편으로는 유비쿼터스 네트워크의 취약점을 이용한 여러 가지 공격 즉 Rogue AP, IP spoofing, DoS 등의 공격에 사회적으로 큰 혼란을 가져올 수 도 있다. 이에 본 논문에서는 유비쿼터스 컴퓨팅 네트워크 환경에서의 보안요구 사항등을 분석해보고 유비쿼터스 컴퓨팅 환경의 네트워크 인프라 구축을 위한 핵심기술인 무선 'Ad hoc'와 RFID에 대해 연구하고자 한다.

• Journal of information and communication convergence engineering
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• 제11권4호
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• pp.223-228
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• 2013

Cognitive radio has been recently considered a promising technology to improve spectrum utilization by enabling secondary access to licensed bands that are not used by primary users temporarily or spatially. A prerequisite to this secondary access is the lack of interference to the primary system. This requirement makes spectrum sensing a key process for cognitive radio. In this study, we consider amplify and forward (AF)-based cooperative spectrum sensing for cognitive radio networks where multiple relay nodes are utilized to amplify and forward the primary user signal for better spectrum sensing, and maximum ratio combining is used for fusion detection by a cognitive coordinator. Further, the detection probability and the bit error rate of AF-based cooperative spectrum sensing are analyzed in fading multiple cognitive relay channels. The simulation results show that the AF-based cooperative spectrum sensing scheme outperforms the conventional scheme.