• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2007년도 학술대회
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• pp.22-26
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• 2007

In the fibre to the home (FTTH) era, it is expected that broadband network provisioning will require thousands of optical fibres to be accommodated in a central office for optical access networks. An optical fibre line testing system could be used to reduce maintenance costs and improve service availability depending on the PON's element manager capabilities and the maintenance procedures adopted by the network supplier. When monitoring optical fibres transmitting communication lights, a wavelength of 1625 nm is used for maintenance testing. The splitter installed optical filters allow the communication light to pass but that cut off the test light in the front of optical line terminals (OLTs) and optical network terminals (ONTs). In the economic point of view, We design new planer lightwave circuit splitter embedded filtter and study it optical property.

• 한국인쇄학회지
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• 제21권1호
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• pp.45-58
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• 2003

The entanglement effects were described by means of holes through which the network chain must pass. Inhomogeneous entanglement effects were related to the hole distributions on the surface and in the center of spheres in the network chains. It was assumed that holes were subjected to the affiance deformation and the network chains were gaussian distribution. The results of this model calculation was compared with the compression- extension experimental data of PDMS (polydimethyl siloxane) rubber, and then hole's relative position was known to be in the center of two adjacent holes.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.208-213
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• 2001

Objective of this paper is to develop a new approach involving the use of an Artificial Neural Network(ANN) and multiple regression methods in the prediction of process parameters on bead height for GMA welding process. Using a series of robotic are welding, multi-pass butt welds carried out in order to verify the performance of the neural network estimator and multiple regression methods. To verify the developed system, the design parameters of the neural network estimator are selected from an estimation error analysis. The experimental results show that the proposed models can predict the bead height with reasonable accuracy and guarantee the uniform weld quality.

• 전자공학회논문지A
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• 제33A권4호
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• pp.57-67
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• 1996

This paper aims to support delay-sensitive multimedia applications by suggesting a mechanism in which maintains almost constant end-to-end delay thus providing the optimum playout synchronization. For this task the sum of network delay and buffering delay is entiredly managed and to eliminate little delay fluctuations and instantaneous delays at a buffer and a network, a low pass filter is used. Furthermore the correction function, which is used for maintaining the buffering level ot a reference value, is a non-linear step function, unlike the existing linear and continuous function. it has a different step sizes adapting to a traffic characteristics of a network congestion. the proposed mechanism has been confirmed of it sefficiency through SLAM-II netowrk.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.498-500
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• 2013

This paper presents a system design which allows monitoring and control of office electrical equipments and devices using senor network through the use of 3G network. The system uses SMS and Email protocols by smart phones to pass information and can be utilized in many scenarios and variety of parameters in which monitoring is desired. The combination of sensors, algorithms and web service are used to generate useful information efficiently and at low cost for the user connected to internet. The information passed is independent of the location of the office users and therefore effective information transfer is achieved from which users can monitor and perform necessary actions to the situations back in the office.

• Journal of Multimedia Information System
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• 제9권2호
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• pp.121-126
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• 2022

The shortest path betweenness value of a node quantifies the amount of information passing through the node when all the pairs of nodes in the network exchange information in full capacity measured by the number of the shortest paths between the pairs assuming that the information travels in the shortest paths. It is calculated as the cumulative of the fractions of the number of shortest paths between the node pairs over how many of them actually pass through the node of interest. It's possible for a node to have zero or underrated betweenness value while sitting just next to the giant flow of information. These nodes may have a significant influence on the network when the normal flow of information is disrupted. We propose a betweenness centrality measure called collective betweenness that takes into account the surroundings of a node. We will compare our measure with other centrality metrics and show some applications of it.

• 인터넷정보학회논문지
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• 제15권4호
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• pp.103-110
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• 2014

본 연구는 국회의원 구성에 있어서 큰 변화를 갖는 17대 국회의 입법발의 결과를 토대로 국회의원 네트워크 분석을 하였다. 각 개별 국회의원들의 입법활동을 넘어서 전체 입법활동에서 국회의원간 협업관계를 파악하고자 하였다. 17대 국회에서 국회의원들이 제출한 대표발의안 총 5728건을 수집하여 국회의원간 이원모드 네트워크를 프로젝션을 통해 분석하였다. 입법발의안을 매개로 국회의원 간의 네트워크 분석을 결과, 입법과정에서 영향력이 큰 국회의원은 물론 여당과 야당의 입법발의 과정에서의 다른 정당의 국회의원들과의 협업관계의 양상이 다름을 알 수 있다.

• Journal of Advanced Marine Engineering and Technology
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• 제37권2호
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• pp.183-191
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• 2013

SOLAS 선박표준 네트워크는 기계시스템 간 실시간 제어감시가 필요한 제어계측 네트워크와 운용자가 컴퓨터 모니터를 통하여 기계를 제어감시 하는 선박제어네트워크 및 외부와의 무선통신 네트워크로 구성되어 있다. 본 논문은 실시간 제어감시가 요구되는 제어계측네트워크로서 국제표준화 된 IEC 61162-3 (NMEA2000 네트워크)에 적합한 프로토콜 스택을 개발하고, 개발된 프로토콜 스택을 사용하여 기관실 모니터링시스템을 개발하였다. 개발된 기관실모니터링시스템을 NMEA에서 제공한 공식인증시험 툴을 사용하여 표준에서 요구하는 항목에 따라 약 1600여 가지의 인증시험과정을 통과하여 인증을 득하였으며 이에 관하여 기술한다.

• 한국안전학회지
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• 제21권4호
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• pp.25-32
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• 2006

LonWorks over IP(LonWorks-IP) virtual device network(VDN) is an integrated form of LonWorks device network and IP data network. In especially real-time distributed servo applications on the factory floor, timely response is essential for predictive and preventive maintenance. The time delay in servo control on LonWorks-IP based VDN has highly stochastic nature. LonWorks-IP based VDN induced transmission delay deteriorates the performance and stability of the real-time distributed control system and can't give an effective preventive and predictive maintenance. In order to guarantee the stability and performance of the system, and give an effective preventive and predictive maintenance, LonWorks-IP based VDN induced time-varying uncertain time delay needs to be predicted and compensated. In this paper new Pill control scheme based on Smith predictor, disturbance observer and band pass filter is proposed and tested through computer simulation about position control of DC servo motor. It is shown that how can the proposed control scheme be designed to minimize the effects of uncertain varying time delay and model uncertainties. The validity of the proposed control scheme is compared and demonstrated with the comparison of internal model controllers(IMC) based on Smith predictor with and without disturbance observer.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.848-854
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• 2009

Of the rapid development of modem civilization development is one of the IT industry. The Network is the root of the discrete industry. Most of the Protocol is used by LAN and the TCP / IP. Slowly in the railway operation of this Network is being applied. It also used to train and they are operated. The concept of the road, the Network TCP / IP using a non-Star structure of the Main Unit and the Bus Network is designed to structure consists of the Network. This structure is a simplified DATA. Data of complex operations is easy to feel the speed limit is. In addition, all devices must be independent to the operating system with the ability to manage the operation and stability in terms of exactly how the transmission of Data is gonna work pass. And transmission occurs in the middle of the Noise and the device is available to manage the power. Noise in the power of the railway to ensure the efficient transfer of Data is by blocking. Also, by presenting the entire system's operational safety should be guaranteed the safety of the railway.