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The basic study on the design of the Light Collision Safety Device (경충돌안전장치 설계를 위한 기초연구)

  • Choi, Won-Mog;Jung, Hyun-Sung;Yu, Won-Hui;Ku, Jung-Seo;Kwon, Tae-Su
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.238-244
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    • 2006
  • The Light Collision Safety Device is used to protect the important part of trains and passengers at the low velocity accidents. The Light Collision Safety Device comprises mainly tension bolts, shear bolts and an energy absorber. The work mechanism of this device is that first, the tension bolts break at designed collapse load and second, the energy absorber absorb rest collision energy. In this paper, the tension bolt characteristics were validated by the simple tension test using the FEM(Finite Element Method) and the characteristic of the two types of energy absorber were compared by using the load-displacement curves and absorbed energy. Last, in order to determine integrated load-displacement curve of tension bolts and the energy absorber, the unified analysis was conducted by using the FEM.

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Experimental Study of Waterproofing Sheet using coat Material filling into the Protuberance to Improve the Durability for Concrete Structure (콘크리트 구조물의 내구성 증진을 위한 돌기입체형 방수시트를 이용한 충전형 옥상복합 방수재료의 실험적 연구)

  • Kim, Jin-Seong;Park, Jin-Sang;Jung, Chun-Su;Oh, Sang-Keun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.649-652
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    • 2006
  • The exist waterproofing membrane cause not to assure proper thickness in constructing. It become a serious problem which as decreasing of durability, waterproofing membrane to be tom and break down. Therefore, it is necessary that the expert have to construct waterproof works,, if not, it can be frost and thawing or chemical corrosion called one of the reason in maintaining the safety of concrete structure. In summarize, for this paper, it would be understand that exposed and compound experimental study of waterproofing sheet using coat material filling into the protuberance to improve the durability for concrete structure can widely apply to field to solve the these significant problem.

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Wavelet based Watermarking Technique for the Digital Contents Protection (지적재산권 보호를 위한 웨이블릿 기반 워터마킹 기술)

  • 송학현;김윤호
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.4
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    • pp.912-917
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    • 2004
  • The increase of illegal usage and conflict in digital content market would diminish motivation of creators for their work, furthermore break down digital content market on cyber-space. Watermarking technology support to the legal users by the protection technique based on the digital content copyright protection method(DRM). Most of previous digital watermarking have embeded to the content. In this paper, we propose a wavelet based watermarking method which is used for implementing in the frequency domain.

A Study on Performance Analysis and Improvement Plan of Campus Network (상명대학교 통신망의 성능분석 및 개선방안에 관한 연구)

  • 이한권;이승혁;이성호;서원흥;이은혜;조태경
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.5 no.4
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    • pp.340-344
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    • 2004
  • In this paper, We collected the data of communication network construction in Sangmyeong University and analyzed them. Moreover using the analysis instrument of communication network traffic, We tested a process of it, and an efficiency of each equipment. We proved the traffic flow and the load quantity during the register for class. As a result We suggested a efficient communication network design - add and change some equipments in order to break up the traffic.

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Study of Changes of Characteristics of SCR in accordance with a rise in temperature (온도상승에 따른 SCR 특성 변화에 관한연구)

  • Lee Young-Soo;Lee Kan-Woon;Park Moon-Dong;Cha Jae-Man
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1199-1201
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    • 2004
  • When The temperature of the joining of SCR rises major changes of characteristics are increase of leakage current, decrease of break-down voltage, and increase of turn off time. Because these changes promote the inferiority of SCR it(SCR) will get out of control and its life time will be shortened and finally it will be destroyed. In this paper, we will measure the changes of the characteristics in accordance with a rise in temperature. On the basis of the result we will find out the appropriate time to change SCR and we will use the result for the maintenance of SCR and increase of reliability of SCR.

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A survey study for retrofit of SOE system in the Nuclear Power Plant (원자력발전소 SOE 계통의 성능개선을 위한 조사연구)

  • Lee, B.C.;Suh, Y.;Chun, C.S.;Lee, J.K.;Moon, C.J.
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.1275-1277
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    • 1996
  • The Sequence Of Event (SOE) system used in nuclear power plants is a part of the Plant Data Acquisition System (PDAS). The SOE system of the existing nuclear power plant share the computer H/W and S/W, and required more complicated structure to provide the events or trip signals. Moreover, there are high potential of collision between synchronization signals and data transmitted to the Plant Computer System(PCS) when the synchronization signals are sent from PCS to the three SOE processors. When this collision happens the SOE system will break down, thus it is not possible to analyze the trend of events or trips. This paper issued the limitation items of the existing SOE system and proposed the revised SOE system.

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Analysis of dielectric and insulation characteristics of elastic epoxy resin according to elastomer contents for power machines (전력용 탄성형 에폭시의 유전 및 절연 특성 해석)

  • Kim, Seok-Jae;Park, Seong-Hee;Lim, Kee-Joe;Lee, Ki-Tae;Kang, Seong-Hwa;Park, Dea-Hee
    • Proceedings of the KIEE Conference
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    • 2004.11a
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    • pp.230-232
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    • 2004
  • In this paper, we investigated dielectric and insulation characteristics of epoxy resin which includes elastomers to improve mechanical property, as varied additive elastomer contents with 5[phr], 10[phr], 15[phr], and 20[phr]. We measured permittivity and tan $\delta$ at 1kHz of signal frequency and room temperature. And we also measured BVD(break-down voltage) and volume resistivities. According to the experimental results, it is appeared that when the additive elastomer contents are increasing, permittivity, volume resistivity, BVD and volume resistance are decreasing because elastomer remains inferior to epoxy resin on electrical properties.

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The clinical report of External Gi-Gong Therapy about Pruritus and Erythema (소양(搔痒)과 홍반(紅班)에 대한 기공치료(氣功治療) 증례보고)

  • Bae Hang;Park Ryung-Jun
    • Journal of Korean Medical Ki-Gong Academy
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    • v.7 no.1
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    • pp.127-148
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    • 2003
  • This paper includes five cases about patient with pruritus and erythema by External Gi-Gong Therapy(EKT) for two days. We judged the patient who has pruritus and erythema, and treated them with External Gi-Gong Therapy(EKT). EKT has always been part of the medical Gi-Gong practice. EKT refers to the process by which a Gi-Gong practitioner directs his intention, or emits his Gi energy, to help others break Gi blockages and induce the sick Gi out of the body so as to alleviate the pain, abate the disease, and balance the flow of Gi. We expect that External Gi-Gong Therapy is effective for patient with pruritus and erythema.

Towards alleviation of the digital divide and poverty through land information

  • Liou, Jae-Ik
    • Journal of Korean Society for Geospatial Information Science
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    • v.10 no.5 s.23
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    • pp.29-43
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    • 2002
  • Accesses to lands, houses, the Internet and other utilities are regarded as basic human needs to escape poverty and are required to recognize the relationships between the digital divide and socio-economical inequality. The digital divide might not be a single technical disparity, but stems from a complicated mixture of economic and socio-technical symptoms of inequality. There is growing awareness of scrutinizing causal mechanisms between the digital divide and poverty since combating poverty could be a primary step to mitigate the digital divide. In this paper, the Hexad model is proposed to explicate poverty interpretation by using 6 parameters as a major tool for partly assisting in poverty monitoring system in connection with land information. A solution model of the Internet is suggested to break the digital divide. It expounds a conceptual framework and new idea for poverty management to notify spatio-temporal locations of poor actors and geography of the digital divide when efforts of poverty eradication hinge on understandings of geographic location of digital disadvantaged groups through parcel-based land information.

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An Experimental Study on Breakdown of Fuel Consumption on a Component Basis in a Gasoline Engine Vehicle (가솔린 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구)

  • 유정철;송해박;이종화;유재석;박영무;박경석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.153-161
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    • 2004
  • A vehicle fuel economy is one of the most important issues in view of environmental regulation and customer's needs. In order to improve the vehicle fuel economy, great efforts has been carried out on the components bases. However, systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel economy. In this paper, a methodology for the breakdown of vehicle fuel consumption was studied and proposed for systematic analysis of the vehicle fuel economy. The energy equation for the vehicle power train was set up for the analysis of the vehicle fuel economy and simplified to be calculated or estimated using the measured data in a vehicle. The amount of fuel that was used in vehicle components under arbitrary driving conditions was quantified.