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Case study on design and construction for cross-connection tunnel using large steel pipe thrust method in soil twin shield tunnels underneath airport (공항하부 토사 병설 쉴드터널에서 대구경 강관추진에 의한 횡갱 설계/시공사례 연구)

  • Ahn, Chang-Yoon;Park, Duhee
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.23 no.5
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    • pp.325-337
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    • 2021
  • On the road and rail tunnels, the evacuation pathway and facilities such as smoke-control and fire suppression system are essential in tunnel fire. In the long twin tunnels, the cross-connection tunnel is usually designed to evacuate from the tunnel where the fire broke out to the other tunnel. In twin shield tunnels, the segment lining has to be demolished to construct the cross-connection tunnel. Considering the modern shield TBM is mostly the closed chamber type, the exposure of underground soil induced by removal of steel segment lining is the most danger construction step in the shield tunnel construction. This case study introduces the excavation method using the thrust of large steel pipe and reviews the measured data after the construction. The large steel pipe thrust method for the cross-connection tunnel can stabilize the excavated face with the two mechanisms. Firstly, the soil in front of excavated face is cylindrically pre-supported by the large steel pipe. Secondly, the excavated face is supported by the plugging effect caused by the soil pressed into the steel pipe. It was reviewed that the large steel pipe thrust method in the cross-connection tunnel is enough to secure the construct ability and stability in soil from the measurement results about the deformation and stress of steel pipe.

Introduction to Researches on the Characteristics of Gas Migration Behavior in Bentonite Buffer (벤토나이트 완충재 내 기체 이동의 거동 특성 관련 연구 동향 소개)

  • Kang, Sinhang;Kim, Jung-Tae;Lee, Changsoo;Kim, Jin-Seoup
    • Tunnel and Underground Space
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    • v.31 no.5
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    • pp.333-359
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    • 2021
  • Gases such as hydrogen and radon can be generated around the canister in high-level radioactive waste disposal systems due to several reasons including the corrosion of metal materials. When the gas generation rate exceeds the gas diffusion rate in the low-permeability bentonite buffer, the gas phase will form and accumulate in the engineered barrier system. If the gas pressure exceeds the gas entry pressure, gas can migrate into the bentonite buffer, resulting in pathway dilation flow and advective flow. Because a sudden occurrence of dilation flow can cause radionuclide leakage out of the engineered barrier of the radioactive waste disposal system, it is necessary to understand the gas migration behavior in the bentonite buffer to quantitatively evaluate the long-term safety of the engineered barrier. Experimental research investigating the characteristics of gas migration in saturated bentonite and research developing numerical models capable of simulating such behaviors are being actively conducted worldwide. In this technical note, previous gas injection experiments and the numerical models proposed to verify such behaviors are introduced, and the future challenges necessary for the investigation of gas migration are summarized.

A Study on the Acceptance and Controversy of Word Library in Korea: Focusing on the Busan Library of the Nihon Kodo-kai (한국의 도서관 명칭 수용 및 쟁점 연구 - 일본홍도회 부산포지회 도서실을 중심으로 -)

  • Hee-Yoon Yoon
    • Journal of Korean Library and Information Science Society
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    • v.54 no.1
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    • pp.1-24
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    • 2023
  • The history of modern libraries in Korea is less than 150 years. Nevertheless, there are various issues about when the word library appeared, how it was transformed, and the name and overall appearance of the library opened by the Busanpo branch of the Nihon Kodo-kai during the enlightenment period. Therefore, this study analyzed and argued many issues. As a result, it was found that the word library appeared in poetry collections, tombstones, and diaries from the early Joseon dynasty. Although it was widely held that the library was first introduced by Yu Gil-jun's 「Seoyugyeonmun, 1895」, it appeared in Lee Hun-young's 「Iisajipryak」 and was also introduced in 「Hanseongsunbo, 1884」. And the first name given to the facility was Kodo library, which was opened by the Busanpo branch on October 10, 1901. Book club, reading club (library), Busan(Busan district) library, Kodo bookstore, Kodo-kai library, etc. which are described in many documents are all errors. The location of the library was a temporary house on a leased site in Seosanhajeong of Yongdusan mountain. And it is presumed that it has secured about one room and 1,000 Japanese and Western books, and provided fee-based services to Japanese residents. Although the Kodo library is not the first public library established by a Korean, it is undeniable that it was the first public library to exist in Korea. Therefore, when defining the character of the Kodo library, it is necessary to have a coolness and discernment beyond national emotions, historical conflicts, and ideological frames.

Framework of seismic design specification for telecommunication (통신설비 적용 내진 규격기준 프레임워크)

  • Lee, Sang-Mu;Cho, Pyung-Dong
    • Journal of the Earthquake Engineering Society of Korea
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    • v.12 no.2
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    • pp.45-52
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    • 2008
  • The telecommunication facilities by the basic law of telecommunication were added to the protection law against natural disasters as a scope of seismic design application on January 2007 since legal regulation had been reinforced in our country as in the circumstance that earthquakes are now frequently occurred in several areas over the world. This paper handles an establishing provision of concrete seismic design specification for applying to telecommunication facilities. For this purpose, this paper classified the parts of telecommunication facilities as being the correspondents to apply seismic design and analyzes the procedure of the design specification of building structure as the part of building construction law as a basic reference for seismic design application. And the method of introducing the foreign specification is presented. Thereon seismic design measures to be introduced into legal regulation are suggested for telecommunication service endurance against earthquake.

A marine leisure of the archipelago at the southwest sea area and its adaptation to yacht business (서남권 다도해 해역의 해양 레저와 요트 산업 적용)

  • Park S. H.;Jung D. D.;Jeong J. S.;Kim C. S.;Nam T. N.
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.11a
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    • pp.197-202
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    • 2004
  • In this paper, we tackled the marine leisure business of the archipelago at the southwest sea area which has the natural advantage for marine leisure. We also discuss how to adapt the yacht business on the above area. At first, we will introduce the predominant case on the marine leisure business of the overseas. Next we will analyze the current situation of the domestic marine leisure and draw up a plan to solve its problem. Finally we apply an environment friendly marina establishment to the archipelago at the southwest sea area and evaluate its validity.

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Utilities and Application of Action Research in Korean Social Welfare Research (사회복지학에서의 실행연구(Action research) 적용과 유용성)

  • Kim, Mi-Ok
    • Korean Journal of Social Welfare
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    • v.61 no.3
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    • pp.179-204
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    • 2009
  • This paper attempts to explain the effect and application of action research in Korean social welfare research and discusses utilities of action research in the broadening and deepening social welfare body of knowledge within Korea. First, this paper examines the concepts, characteristics, and relevant literatures of action research. Second, this paper attempts to explain the effect, meanings, and application of action research in Korean social welfare research with examples from study on development of user involvement manuals for the disabled residential facilities for the first time in Korea. Third, this paper discusses utilities of action research in broadening and deepening social welfare knowledge body in Korea. In discussing the utilities, this paper maintains that action research can be more properly utilized for research methods to decrease the gab of research and social work practice. Finally, this paper highlights that 'many ways of knowing' exist in social science and it should be considered more sincerely in the arena of Korean social welfare research in order to more solidly develop the knowledge body of social welfare and practice in Korea.

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Collaborative Visualization of Warfare Simulation using a Commercial Game Engine (상업용 게임 엔진을 활용한 전투 시뮬레이션 결과의 협업 가시화)

  • Kim, Hyungki;Kim, Junghoon;Kang, Yuna;Shin, Suchul;Kim, Imkyu;Han, Soonhung
    • Journal of the Korea Society for Simulation
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    • v.22 no.4
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    • pp.57-66
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    • 2013
  • The needs for reusable 3D visualization tool has been being raised in various industries. Especially in the defense modeling and simulation (M&S) domain, there are abundant researches about reusable and interoperable visualization system, since it has a critical role to the efficient decision making by offering diverse validation and analyzing processes. To facilitate the effectiveness, states-of-the-arts M&S systems are applying VR (Virtual Reality) or AR (Augmented Reality) technologies. To reduce the work burden authors design a collaborative visualization environment based on a commercial game engine Unity3D. We define the requirements of the warfare simulation by analyzing pros and cons of existing tools and engines such as SIMDIS or Vega, and apply functionalities of the commercial game engine to satisfy the requirements. A prototype has been implemented as the collaborative visualization environment of iCAVE at KAIST, which is a facility for immersive virtual environment. The facility is intraoperative with smart devices.

SDN based Discrimination Mechanism for Control Command of Industrial Control System (SDN 기반 산업제어시스템 제어명령 판별 메커니즘)

  • Cho, Minjeong;Seok, Byoungjin;Kim, Yeog;Lee, Changhoon
    • Journal of Digital Contents Society
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    • v.19 no.6
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    • pp.1185-1195
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    • 2018
  • Industrial Control System (ICS) is a system that carry out monitoring and controls of industrial control process and is applied in infrastructure such as water, power, and gas. Recently, cyber attacks such as Brutal Kangaroo, Emotional Simian, and Stuxnet 3.0 have been continuously increasing in ICS, and these security risks cause damage of human life and massive financial losses. Attacks on the control layer among the attack methods for ICS can malfunction devices of the field device layer by manipulating control commands. Therefore, in this paper, we propose a mechanism that apply the SDN between the control layer and the field device layer in the industrial control system and to determine whether the control command is legitimate or not and we show simulation results on a simply composed control system.

Development of Equipment Measuring Insulation Resistance of High-Power Cables in Operation at Power Station (발전소에서 운전 중인 고전력 케이블의 절연저항의 변화를 감시하는 장치의 개발)

  • Um, Kee-Hong;Kim, Bo-Kyeong
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.4
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    • pp.159-164
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    • 2016
  • In or to generate high electric power in increasing demand, power station should operate facilities to meet requirement. The scale of electric power equipment is increasing in both size and complexity. With unexpected accidents at power facilities or power stations happening, substantial socioeconomic losses in an industrial society is caused. A major cause of unexpected accidents is deterioration of dielectrics, isolating two conductors electrically. In order to detect the deterioration processes of power cables, the operation status of power cables should be monitored on a regular basis. We have invented and installed equipment at Korea Western Power Co., Ltd., located in Taean, in order to predict and prevent the deterioration status of dielectrics destruction of power cables. The main line in Y-connection to the secondary coils of transformer delivers electric power to the external devices. The equipment we developed is the one measuring insulation resistance of cables operation in on/off status with respect to the main line. We present the equipment in terms of operation and configuration of hardware side.

Introduction to infrared sensing technique for quantifying crop water stress (작물 수분스트레스 정량화를 위한 적외선 센싱 기술 도입 연구)

  • Kim, Min-Young;Choi, Yonghun;Jeon, Jong-Gil;Kim, Young-Jin
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2017.04a
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    • pp.132-132
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    • 2017
  • 고품질 농산물을 대량 생산하기 위한 가장 중요한 것은 적절한 관개관리이다. 생육시기별 작물 재배에 있어서 꼭 필요한 만큼의 물을 필요한 때에 준다면, 농업용수를 절약할 수 있을 뿐만 아니라, 작물의 한발 및 습해에 따른 피해를 최소화 할 수 있을 것이다. 기존의 토양 및 증발산량 기반의 자동 물관리 기술의 경우 직접적으로 작물의 상태변화를 실시간으로 확인할 수 없으며, 측정오차가 크고 작물수량이 많을 경우 측정시간 및 소요비용이 크다는 단점이 있다. 이를 극복하기 위해 최근 작물의 수분 스트레스를 비파괴적으로 측정하여 관개계획에 활용하는 연구가 해외에서 활발히 이루어지고 있다. 본 연구에서는 열영상 기술을 활용한 적정 관개계획 수립과 관련된 국내외 연구 사례를 소개하고, 오이를 대상으로 토양수분함량 변화에 따른 엽온 변화를 측정하고, 실시간으로 작물의 수분스트레스 여부를 분석하기 위한 예비실험을 실시하였다. 엽온 측정을 위해 적외선 센서(CT-300-232, DiWell, Korea)를 사용하였으며, 관개조건에 따른 엽온 및 FDR센서를 이용하여 토양수분변화를 모니터링 하였다. 세 가지 토양수분조건, 즉 200% ETc(과다관개), 100% ETc(적정관개), 30% ETc(과소관개),을 시험구에 조성하고, 각각의 처리구에 따른 엽온변화를 측정하였다. 동일한 대기온도하에서 엽온의 변화를 살펴본 결과, 과소관개한 시험구에서의 엽온변화 폭이 가장 컸으며, 적정관개의 엽온 변화폭이 가장 작게 나타났다. 이는 물관리 조건에 따라 많이 줘도, 적게 줘도 스트레스 요인으로 작용함을 확인할 수 있었다. 향후 연구에서는 실시간 엽온자료와 더불어 기상자료를 활용하여 작물 수분스트레스 지수(Crop Water Stress Index, CWSI)을 산정하고, 이를 관개시설 운영 및 제어에 활용하기 위한 모듈 개발을 수행할 계획이다.

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