• 전자공학회논문지
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• 제52권1호
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• pp.69-78
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• 2015

차세대 단말기 보급과 초고속 네트워크의 발전으로 클라우드 컴퓨팅이 등장하면서 VDI(Virtual Desktop Infrastructure)가 핵심 기술로서 많은 주목을 받고 있다. VDI는 하나의 물리적인 컴퓨터에 하이퍼바이저를 설치하여 다수의 가상머신을 운영하는 기술이다. 현재 VDI 분야의 핵심 이슈는 가상머신과 물리적머신 간의 성능 차이를 줄이는 것이며, 이와 관련된 여러 연구들이 꾸준히 진행되고 있다. 본 논문에서는 서버와 가상머신의 실시간 자원 사용량과 정보를 수집하는 SETMOV(Supervised Real Time Monitoring on VDI)를 설계하고 구현하였으며, 이를 바탕으로 VDI 성능 최적화를 위해 가상머신의 자원 사용량을 분석하여 서버의 자원을 재분배하는 방법을 제시한다.

• 한국조명전기설비학회지:조명전기설비
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• 제11권4호
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• pp.92-99
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• 1997

본 논문에서는 공동주택의 승강기 설비에서 경보 처리 방법을 신경회로망을 적용하여 감시제어의 효율을 향상시킬 수 있는 방안을 제시하였다. 제안된 방법은 역전파 알고리즘의 누가 역전파 알고리즘을 이용하여 다중 경보 발생에서 최소 경보요소를 추론하는데 사용하고 추론된 경보는 사전에 정의된 고장진단 지식베이스를 이용하여 설비 유지보수 정보를 화면에 전개하도록 구성하였다. 제안된 감시기법의 유용성을 확인하기 위하여 3가지의 가상시나리오를 통해서 신경회로망의 적용 가능성을 확인할 수 있었으며 공동주택에 적용한다면 유지보수 환경에 활용할 수 있을 것이다.

• 융합신호처리학회논문지
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• 제1권1호
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• pp.74-81
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• 2000

기존의 전용선을 사용하는 화상 감시 시스템의 문제점을 해결하기 위해 인터넷을 이용한 3계층 웹기반 화상 감시 모델을 제안하고 시스템으로 구현하였다. 개발된 시스템은 3계층 웹기반 분산제어 모델을 채택함으로써 기존의 중앙 집중제어 방식의 시스템 안정성 문제를 해결하였고, 원격 웹브라우저에서 그룹으로 등록된 복수의 화상 감시 싸이트(Site)를 인터넷을 통해 원격제어 및 자동감시가 가능하다. 또한 자바 가상 기계(Java Virtual Machine) 코드와 가상 인스트루먼트(Virtual Instrument) 개념에 의한 운용 소프트웨어 설계로 다양한 종류의 컴퓨터와 OS에서도 운용이 가능하다. 또한 인터넷을 통한 네트워크 구성이므로 별도의 네트워크 구축비용이 들지 않으며, 웹서버를 사용한 운용 소프트웨어의 배포 및 보수 유지가 이루어지므로 소프트웨어 갱신 등에 따른 관리의 효율성을 크게 개선 할 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.105-110
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• 1998

This paper proposes a graphical user interface for industrial robot systems. Previous user interfaces for industrial robot systems were based on the text. In order to enable operators to handle robots more efficiently, a set of graphical tools is provided. The graphical tools contain a control panel for operating robots and compiling robot programs, a graphical teaching panel for handling virtual robots and a graphical monitoring panel for checking robot status. Furthermore, the proposed GUI can be used to operate remote robots because it has network utilities. This system consists of the virtual mode and the real mode. The user can handle a 3D virtual solid model of the robot in the virtual mode and an actual robot in the real mode.

• 한국자동차공학회논문집
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• 제11권4호
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• pp.173-179
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• 2003

In this paper, a real-time multibody vehicle dynamics and control model has been developed for a virtual reality intelligent vehicle simulator. The simulator consists of low PCs for a virtual reality visualization system, vehicle dynamics and control analysis system a control loading system, and a network monitoring system. Virtual environment is created by 3D Studio Max graphic tool and OpenGVS real-time rendering library. A real-time vehicle dynamics and control model consists of a control module based on the sliding mode control for adaptive cruise control and a real-time multibody vehicle dynamics module based on the subsystem synthesis method. To verify the real-time capability of the model, cut-in, cut-out simulations have been carried out.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.701-704
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• 2003

The home network system of ubiquitous computing concept is changing present our home life as more comfortable and safe. Also, it permits that we can connect the home network system and control the appliance which is linked to the home network system without limitation in time and place. But, as other systems that use the public network like the Internet, remote control/monitoring of the home network system that use the Internet includes problems such as user's access which is not admitted and information changing. This paper presents the efficient solution about the security problem that is recognized to important problem of the home network system. Also this paper implements the security of the home network system based on the UPnP (Universal Plug and Play), adding VPN (Virtual Private Network) router that uses the IPsec to the home network system which is consisted of the ARM9 and the Embedded Linux.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.53-62
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• 2011

With the steady growth of mobile technology and applications, demand for more storage in mobile devices has also increased. A lightweight block-level protocol, Internet Advanced Technology Attachment (iATA), has been developed to deliver a cost-effective storage network solution for mobile devices to obtain more storage. This paper seeks to contribute to designing and implementing Load Balancing (LB), Network Monitoring (NM) and Write Replication (WR) modules to improve the protocol's scalability and data availability. LB and NM modules are invoked to collect system resources states and current network status at each associate node (server machine). A dynamic weight factor is calculated based on the collected information and sent to a referral server. The referral server is responsible to analyze and allocate the most ideal node with the least weight to serve the client. With this approach, the client can avoid connecting to a heavily loaded node that may cause delays in subsequent in-band I/O operations. Write replication is applied to the remaining nodes through a WR module by utilizing the Unison file synchronization program. A client initially connected to node IP A for write operations will have no hindrances in executing the relevant read operations at node IP B in new connections. In the worst case scenario of a node crashing, data remain recoverable from other functioning nodes. We have conducted several benchmark tests and our results are evaluated and verified in a later section.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2000년도 하계종합학술대회논문집
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• pp.49-52
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• 2000

In this paper we have developed an image security system based on Internet Web in order to overcome the problem of existing systems that use the dedicated network. The developed system resolves the safety problem of the centralized control model by adapting the distributed control model based on Web, and has the functions of remote control and automatic monitoring for grouped multiple sites on Web browser. And the system can operate various computers or operating system because it's operating software was designed by the concepts of Java Virtual Machine and Virtual Instrument. Also, our system has not need of additional cost for network construction by using Internet and can greatly improve the managemental efficiency of system because the maintenance and publishing of software updates can be performed through Web Server.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1986년도 춘계학술발표회 논문집
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• pp.119-124
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• 1986

This paper describes the development of the KORNET that may be regarded as the latest public packet-swiched computer communication network. The KORNET project included the development of the network management center (NMC), a network concentrator. For the KORNET we use the virtual circuit(VC) method, a distributed adaptive routing algorithm, and a dynamic buffer management algorithm. The NMC acts as a nerve center of the network, performing such function as network monitoring, subscriber and network management and routing management, etc. As for the NNP and NC hardware, we have implemented them with the 16-bit multitask/multiprocessor technology using MC68000 microprocessors. Softwares have been developed using C language is required for real time processing. All the network protocols we have developed comply completely with the latest CCITT recommendations including X.25, X,3 , X.28 and X.29.

• 한국경영과학회지
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• 제18권1호
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• pp.45-54
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• 1993

Monitoring processor in a circuit switched network is considered. Monitoring processor monitors communication links offers a grade of service in each link to controller. Such an information is useful for an effective maintenance of system. Two links with asymmetric system parameters and multi-symmetric links are respectively considered. Each links is to be an independent M /M/ 1/ 1/ type. Markov modeling technique is used to represent a model of monitoring processor with FCFS steering protocol. Performance measures considered are ratio of monitored jobs in each link, availability of minitoring processor and throughput of virtual processor in each link. The value of the performance meausres are compared with existing and simulation results.