• 한국정보처리학회논문지
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• 제6권3호
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• pp.729-741
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• 1999

ATM networks are widely deployed as the network that is capable of supporting multimedia services efficiently now. To date, a large portion of ATM connections, particularly in the WAN environment, have been of a permanent virtual circuits-requiring management intervention for set-up and tear-down. However, switched virtual circuits are required to support a range of desired characteristics on demand, to a reachable end user. To establish, maintain and release on-demand call/connections, the user-network interface(UNI) and node-node interface(NNI) signalling capabilities are required. Two protocols have been specified for NNI signalling within a public network: the broadband integrated-services user part(B-ISUP) protocol specified by the ITU-T, and the private network-network interface(PNNI) protocol specified by the ATM Forum. PNNI offers different type of internetwork or internodal interface from the traditional B-ISUP approach favored to date public network operators. In spite of its name, PNNI may find its place in network service provide networks as well as in private networks. Thus many public network operators and ATM equipment manufacturers are still unable to choose the NNI interface architecture of their system. In this paper, we survey the characteristics of the B-ISUP and PNNI protocols, and investigate the applicability issue of these specifications to the ATM-based Information Infra-Network of Korea. Analyzing the characteristics of the two protocols and clarifying the NNi requirements of the ATM-based Information Infra-Network of Korea, we propose that the B-ISUP protocol is more suitable than PNNI.

• 디지털콘텐츠학회 논문지
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• 제19권4호
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• pp.809-814
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• 2018

클라우드 컴퓨팅 기반 인프라가 확산됨에 따라, 서비스 프로바이더는 온-디맨드 방식의 서비스 배포가 가능해졌다. 최근 클라우드형 인프라의 자원 확장성 효율을 극대화하기 위해 마이크로 서비스 구조가 주목받고 있다. 모든 서비스 기능을 하나의 소프트웨어로 구현하는 대신 필요한 서비스를 효율적으로 설계된 Application Programming Interface (API)를 통해 연동함으로써 쉽고 자율적으로 구현할 수 있고, 기능의 요구사항에 맞는 프로그래밍 언어, 소프트웨어, 기능구조를 자유로이 정할 수 있다. 본 논문에서는 마이크로 서비스 구조를 기반으로 가상 인프라 매니저 서비스를 설계하고 제안된 구조가 부하에 따라 효율적으로 스케일링이 가능함을 실험을 통해 검증한다.

• 한국정보과학회논문지:시스템및이론
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• 제33권10호
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• pp.734-745
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• 2006

본 논문에서는 VIA(Virtual Interface Architecture) 통신 프로토콜과 인터벌 캐쉬 기법을 적용하여 서버 내부 통신망의 부하를 감소시킨 PC 클러스터 기반 분산 VOD 서버를 제안한다. 분산 VOD 서버의 각 노드는 클러스터상에 분산 저장된 비디오 데이타를 서버 내부 통신망을 사용하여 전송받아 사용자에게 제공한다. 이 때, 대량의 비디오 데이타가 서버 내부 통신망을 통하여 전송됨으로 서버 내부 통신망에 부하가 증가한다. 본 논문에서는 TCP/IP의 통신 오버헤드를 제거한 사용자 수준 통신 프로토콜인 VIA에 기반한 분산 VOD 파일 시스템을 개발함으로써, 원격 디스크를 접근하는데 소요되는 내부 통신망 비용을 최소화하려고 하였다. 또한, VIA의 최대 전송 크기를 VOD 시스템에 맞게 확장함으로써 내부 통신망의 성능을 향상시키려고 하였다. 추가로 본 논문은 인터벌 캐쉬 기법을 적용하여 원격 서버 노드에서 전송 받은 비디오 데이타를 지역 노드의 메인 메모리에 캐쉬함으로써, 서버 내부 통신망에 발생하는 통신량을 감소시켰다. 실험을 통하여 분산 VOD 서버의 성능을 측정하였으며, TCP/IP에 기반하고 인터벌 캐쉬를 지원하지 않는 기존의 분산 VOD 서버와 성능을 비교하였다. 실험결과, VIA 적용으로 약 11.3%의 성능 향상, 그리고 인터벌 캐쉬 기법을 적용하여 추가로 약 10%의 성능 향상이 생겨 총 21.3%의 성능 향상을 얻을 수 있었다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (3)
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• pp.874-876
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• 2001

클러스터링(clustering)은 병렬 처리를 위한 기술로 비교적 값이 싼 컴퓨터들을 네트웍으로 연결하여 전체가 하나의 고성능 수퍼 컴퓨터처럼 동작하게 하는 기술이다. 이 클러스터 시스템의 성능을 최대한 활용하기 위해서는 디스크 입출력에 생기는 병목현상을 해결하여야 하는데, 그 해결책의 하나로 병렬파일시스템을 들 수 있다. 기존의 병렬파일시스템은 TCP/IP기반의 소켓으로 메시지를 주고받았다 그러나 TCP/IP는 프로토콜 오버헤드가 크고 처리 속도가 느리다. 본 논문에서는 이런 오버헤드를 줄이기 위해 도입된 Lightweight 메시징 기법인 VIA(Virtual Interface Architecture)를 이용하여 병렬파일시스템을 구현하기 위한 구체적인 방안을 제시하고 있다.

• 한국CDE학회논문집
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• 제20권4호
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• pp.420-430
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• 2015

Operator Training Simulators (OTSs) provide macroscopic training environment for plant operation. They are equipped with simulation systems for the emulation of remote monitoring and controlling operations. OTSs typically provide 2D block diagram-based graphic user interface (GUI) and connect to process simulation tools. However, process modeling for OTSs is a difficult task. Furthermore, conventional OTSs do not provide real plant field information since they are based on 2D human machine interface (HMI). In order to overcome the limitation of OTSs, we propose a new type of plant training system. This system has the capability required for collaborative training between operators and field workers. In addition, the system provides 3D virtual training environment such that field workers feel like they are in real plant site. For this, we designed system architecture and developed essential functions for the system. For the verification of the proposed system design, we implemented a prototype training system and performed experiments of collaborative training between one operator and two field workers with the prototype system.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.59-64
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• 2008

본 논문은 클라이언트/서버 구조의 촉감기반 네트워크 가상환경 시스템의 안정성을 평가하고, 네트워크 지연에 따른 촉감의 질적 저하 정도를 분석한다. 이를 통해서 안정성과 투명성을 위한 올바른 통신 구조를 도출하고 사용자가 요구하는 현실감 수준에 적합한 네트워크 상황의 예측 방법을 소개한다. 또한 네트워크 지연에 의해 생성되는 비현실적인 힘 피드백을 스프링 상수의 동적인 변경을 통해서 보상하는 네트워크 지연 보상기법을 제안한다. 촉감 기반 네트워크 응용프로그램을 기반으로 제안된 촉감기반 네트워크 가상환경 구조의 안정성 및 투명성 평가의 타당성을 검증하고 네트워크 지연 보상 기법의 유용성을 확인한다.

• 조명전기설비학회논문지
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• 제29권11호
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• pp.96-101
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• 2015

In recent years, researches regarding optimal placement of CCTV(Closed-circuit Television) cameras via architecture modeling has been conducted. However, for analyzing surveillance coverage through actual human movement, the application of VA(Video Analytics) function of IP(Internet Protocol) cameras has not been studied. This paper compares two methods using data captured from real-world cameras and data acquired from a virtual environment. In using real cameras, we develop GUI(Graphical User Interface) to be used as a logfile which is stored hourly and daily through VA functions and to be used commercially for placement of products inside a shop. The virtual environment was constructed to emulate an real world such as the building structure and the camera with its specifications. Moreover, suitable placement of the camera is done by recognizing obstacles and the number of people counted within the camera's range of view. This research aims to solve time and economic constraints of actual installation of surveillance cameras in real-world environment and to do feasibility study of virtual environment.

• 제어로봇시스템학회논문지
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• 제7권1호
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• pp.1196-1204
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• 2001

In this paper, a new architecture of operating software associated with the component-based method is proposed. The proposed architecture comprises 문 execution module and a decision-making module. In order to make effective development and maintenance, the execution module is divided into three components. The components are referred to as Symbol, Gateway, and Control, respectively: The symbol component is for the GUI environments and the standard interfaces; the gateway component is for the network communication and the structure of asynchronous processes; the control component is for the asynchronous processing and machine setting or operations. In order to verify the proposed architecture, and off-line version of operating software is made, and its steps are as follows; I) Make virtual execution modules for the manufacturing devices such as dual-arm robot, handling robot, CNC, and sensor; ii) Make decision-making module; iii) Integrate the modules and GUI using a well-known development tools such as Microsofts Visual Basic; iv) Execute the overall operating software to validate the proposed architecture. The proposed software architecture in this paper has the advantages such as independent development of each module, easy development of network communication, and distributed processing of resources, and so on.

• 제어로봇시스템학회논문지
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• 제14권1호
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• pp.13-20
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• 2008

Sensor network consists of a large number of sensor node distributed in the environment being sensed and controlled. The resource-constrained sensor nodes tend to have various and heterogeneous architecture. Thus, it is important to make its software environment platform-independent and reprogrammable. In this paper, we present BeeVM, a Java operating system designed for sensor networks. BeeVM offers a platform-independent Java programming environment with its efficiently executable file format and a set of class APIs for basic operating functions, sensing and wireless networking. BeeVM's high-level native interface and layered network subsystem allow complex program for sensor network to be short and readable. Our platform has been ported on two currently popular hardware platforms and we show its effectiveness through the evaluation of a simple application.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.547-550
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• 2011

The purpose of this paper is to verify and validate the maintenance tasks of the construction of a nuclear facility using a digital mock-up and simulation technology instead of a physical mock-up. Prior to the construction of a nuclear facility, a remote simulator that provides the opportunity to produce a complete digital mock-up of the PRIDE (Pyroprocess Integrated Inactive DEmonstration Facility) region and its remote handling equipment, including operations and maintenance procedures has been developed. In this paper, the system architecture and graphic user interface of a remote simulator that coincides with the extraordinary nature of a nuclear fuel cycle facility is introduced. In order to analyze the remote accessibility of a remote manipulator, virtual prototyping that was performed it by using haptic device of external input devices under a 3D full-scale digital mock-up is explained.