• Title/Summary/Keyword: Load share

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Design of an Advanced Kerbros P2P Authentication System to Share Digital Content (디지털 콘텐츠 공유를 위한 개선된 Kerberos P2P 인증시스템 설계)

  • Kim Jong-Woo;Han Seung-Jo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.7
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    • pp.1516-1523
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    • 2004
  • In the paper, an algorithm fitted to P2P system was proposed by improving Kerberos which is an algorithm for mutual authentication. To keep the role of Kerberos and minimize load to server, the proposed algorithm imposed the server role of ticket recognition to the opposite peer. Using this method, the number of sewers as ticket recognition server was averted and function of server for authentication was minimized so that server load was mininized. The proposed algorithm enables the server to play the minimum of the role and to perform strong mutual authentication, while imposeing on the peers the role of authentication. To make suitable to P2P system, trial number oriented authentication limit was given, not time-oriented authentication expiration time. In the paper, a new P2P system was designed using this algorithm.

Analysis of the Load Contribution of Wind Power and Photovoltaic Power to Power System in Jeju (제주지역 풍력발전 및 태양광발전의 전력계통 부하기여 분석)

  • Myung, Ho-San;Kim, Hyung-Chyul;Kang, Nam-Ho;Kim, Yeong-Hwan;Kim, Se-Ho
    • Journal of the Korean Solar Energy Society
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    • v.38 no.1
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    • pp.13-24
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    • 2018
  • As part of the "Carbon free Island 2030" policy, the local government of Jeju Island is currently working to reduce carbon through renewable energy supply. However, renewable energy is difficult to predict due to intermittent characteristics. If the share of renewable energy increase, it is difficult to plan of supply of electricity to grid due to that characteristic of renewable. In this paper analyze the fluctuation rate and the capacity credit of wind power and PV to find out how much wind power and PV contribute to supply of electricity of power system in Jeju. As a result mean value of variation rate of wind power and PV is about 3%, 5% and capacity credit is about 10% and 2% respectively.

Design and Implementation of P2P-Based Data Service System to Reduce Server Load (서버 부하 감소를 위한 P2P 기반 데이터 서비스 시스템의 설계 및 구현)

  • Lee, Kwang-Hyon;Jeon, Hyung-Su;Yoo, Cheol-Jung;Chang, Ok-Bae
    • The KIPS Transactions:PartC
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    • v.9C no.5
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    • pp.615-626
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    • 2002
  • Recently, as interest in Home networking is increased, research about multimedia clip service is gone. Because of the limit to bandwidth of home network, the problem of server traffic is increased by transferring many multimedia data through Client-Sewer Way for long. The data share network system applied is designed and implemented to solve this problem. P2P is connected directly between clients and exchanges data without going through a sewer. We implemented platform-independent System using Java and applied P2P skill to reduce server traffic.

A Study on Load Bearing Capacity of Composite Member with Steel Rib and Shotcrete in NATM Tunnel (NATM 터널에서 강지보와 숏크리트 합성부재의 하중지지력에 관한 연구)

  • Moon, Sang Hwa;Shin, Young Wan;Kim, Seung Hwan;Yoo, Han Kyu
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.5C
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    • pp.221-229
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    • 2012
  • Steel ribs such as H-beam or lattice girder are often reinforced to secure the stability of NATM tunnel when the ground is in the bad condition. When designing, however, steel ribs are not often taken into consideration on the numerical analysis when they are regarded as temporary tunnel supports until shotcrete shows its best performance or if they are, there are various modeling methods. This study shows behavior and loading capacity of steel ribs and shotcrete through the strength test on the bending, pressure and full-scaled. Also, we conducted and analyzed the experiment of composite member consisting of shotcrete and steel ribs under the same condition. Through the result, we can find the fact that shotcrete and steel ribs do not work as one unit because of slipping on the boundary. Also, when numerical analyzing, it was concluded that steel ribs cover all bending moment and shotcrete and steel ribs share with axial force according to the compressive strength.

Grid-based Biological Data Mining using Dynamic Load Balancing (동적 로드 밸런싱을 이용한 그리드 기반의 생물학 데이터 마이닝)

  • Ma, Yong-Beom;Kim, Tae-Young;Lee, Jong-Sik
    • Journal of the Korea Society for Simulation
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    • v.19 no.2
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    • pp.81-89
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    • 2010
  • Biological data mining has been noticed as an issue as the volume of biological data is increasing extremely. Grid technology can share and utilize computing data and resources. In this paper, we propose a hybrid system that combines biological data mining with grid technology. Especially, we propose a decision range adjustment algorithm for processing efficiency of biological data mining. We obtain a reliable data mining recognition rate automatically and rapidly through this algorithm. And communication loads and resource allocation are key issues in grid environment because the resources are geographically distributed and interacted with themselves. Therefore, we propose a dynamic load balancing algorithm and apply it to the grid-based biological data mining method. For performance evaluation, we measure average processing time, average communication time, and average resource utilization. Experimental results show that this method provides many advantages in aspects of processing time and cost.

International Standardization of Intelligent Broadband Communication of Train (철도차량 지능형 광대역 통신망의 국제표준화 동향)

  • Hwang, Hyeon-Chyeol;Lee, Ho-Yong;Cho, Bong-Kwang;Kwak, Jae-Ho
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.1027-1034
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    • 2011
  • Electronic devices in railway vehicle perform various functions such as not only braking and propulsion but also monitoring of vehicle condition, on-line diagnosis, and passenger information service, etc. These devices, distributed in vehicle, should be efficiently connected so as to properly perform the functions. IEC (International Electro-Technical Commission) standardized train communication network (TCN) as IEC 61375-1, -2. TCN can reduce the interconnecting work load by reducing the number of wire-line, compared with existing hard-wire connection, and it brings the efficient control by enabling various devices to share the information. But existing TCN can not satisfy the increasing service demands like passenger internet access and CCTV surveillance, etc. In this paper, we investigate ECN (Ethernet Consist Network) and ETN (Ethernet Train Backbone) which are proposed to satisfy these demands and in the process of standardization by IEC TC9 WG43.

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Trends of Technology Development of Friction Stir Welding Machine (마찰교반접합장비의 기술개발 동향)

  • Kim, Young-Pyo;Kim, Cheol-Hee;Kim, Young-Gon;Joo, Sung-Min
    • Journal of Welding and Joining
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    • v.34 no.3
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    • pp.1-5
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    • 2016
  • At present, FSW(friction stir welding) process is being considered as an actual way for production of various industrial products. However FSW process involves high temperature and load on the tool during welding. These are make a difference between FSW machine and general machine tools. From this reason, development of FSW machine needs very careful consideration on stiffness of machine structure, spindle and moving axis including machine control system. In this study authors investigate on the trends of technology development of FSW machine in order to share the information for more extension of FSW technology with related researchers and engineers.

The Study on Microstructures and Mechanical Properties of Mild Steel Joined with Various Spot Welding Conditions (점용접 조건에 의한 연강의 미세조직 및 기계적특성에 관한 연구)

  • 강연철;김대영;김완기;김석원
    • Journal of Welding and Joining
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    • v.18 no.1
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    • pp.52-58
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    • 2000
  • Spot welding, namely a kind of electric resisting welding has been used widely in field of automobile and aircraft industries because of easiness to apply. Specimens used in this study was a mild steel of 1.2mm thickness and the electrode was a Cu-Cr alloy of 6mm diameter. The surface sheared of specimens after testing of tensile shear was observed by SEM(scanning electron microscope) after ultrasonic cleaning for 10min., and microstructures and grain size of all specimens were measured with using of O.M.(Optical microscope). By the means of measurement and observations of tensile shear load, fatigue strength and share surface, the weldability of spot welding was evaluated. When tensile shearing testing, fracture starting point in all specimens was took place at the bond between HAZ(Heat affected zone) and nugget. With increasing in number of layers, fatigue strength was decreased. With increasing in electric current, grain size in the HAZ became more fine.

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Analysis of Parallel Characteristics for Virtual Implement of 50[W]Solar Cell modules (태양전지 가상구현 시스템[50W]의 병렬연결 출력특성에 대한 분석)

  • Lee, B.I.;Jung, B.H.;Jeon, Y.S.;Choe, G.H.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.362-364
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    • 2003
  • Generally, photovoltaic system is composed a number of solar cells array. so, virtual implementation module for solar cell array is needed Parallel connection each module for extract the power. A desirable characteristic of a parallel supply system is that individual converters share the load current equally and stably. The current sharing(CS) can be implemented using two approaches. The first one, known as a droop method, relies on the high output impedance of each converter. and The second approach, known as active current-sharing techniques. In this paper, analyze for better control logic of parallel connecting virtual implements of solar cell at using droop method.

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Evaluation of the Impacts of SPD Connecting Lead Lengths and SPD Protection Distance to the Apparatus in Apartments (공동주택에서 SPD의 리드선 길이 및 보호거리에 대한 영향 평가)

  • Lee, Ki-Hong;Kang, Moo-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.10
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    • pp.94-101
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    • 2011
  • The proper installation of SPD and the evaluation of the SPD protection distance are basic steps for the effective protection measures of apparatus against surges within a structure. A novel method for installing SPD on the conventional distribution board without any modification was proposed and it's effectiveness was evaluated by experiments. Also, the transient overvoltage occurred across the power line from the SPD to the load was simulated with EMTP software to see how different the protection distances affecting the magnitude of the transient overvoltage. As evaluated, the effective protection method of apparatus against surges, coordinated SPD protection system is suggested as a proper measure to protect within the apartment.