• Journal of KIISE:Computing Practices and Letters
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• v.15 no.4
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• pp.255-259
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• 2009

In this paper, we present AGE(Automatic Grid Environments), which is a middleware system in which Grid resources can automatically participate in a Grid environment. While other existing systems need the configuration of each Grid node to deploy a Grid environment, AGE offers automatic installation and execution of necessary middleware for participating in a Grid environment. And Grid applications in AGE do not need to be pre-installed and pre-configured. When an application is to be executed in participating Grid nodes, this system can download, install, and execute the application automatically. Therefore, AGE provides users with convenience such as deploying a Grid environment, executing the application, and releasing nodes or resources from the Grid environment automatically.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.233-234
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• 2019

기존 스마트팜 기술은 수요자 중심이 아닌 대량 생산을 목적으로 시스템화 되어왔다. 이는 고령화에 따른 실질적 농촌 환경에 적용되기에는 경제적인 측면 등의 많은 문제점이 있다. 본 연구에서는 농촌 지역 인구의 고령화로 인한 적용성을 전제로 스마트팜 기술을 적용하고자 한다. 뜨거워지는 폭염으로 인해 일반적인 온실재배시설의 농작물들은 일소 피해와 시들어 말라가는 경우가 많았다. 피해를 최소화하기 위해서는 온습도 환경을 조절해주거나 차광막을 설치해주어야 한다. 하지만 현재 농촌의 작업자들 나이가 점점 증가하고 있고, 홀로 농사를 짓는 고령자가 대다수여서 많은 일을 혼자 감당하기에는 어려움이 많다. 그리고 신체가 연약한 사람들의 경우, 무거운 짐을 옮기다가 자칫 안전사고로 이어질 위험이 있다. 본 논문은 이러한 문제점들을 개선하고 예방하기 위해 기존의 스마트팜 온실 내부에 작업자를 추종하는 소형 스마트 차량을 적용한 '자동 운반 기능이 가능한 스마트팜' 기술을 제안한다. 기존의 스마트 온실 환경제어 기능을 수행하며, 고랑마다 레일을 설치하고 작업자를 추종하는 차량이 있는 스마트팜이며, 어플리케이션을 통해 직접 온실과 차량을 원격으로 수동 제어할 수 있다.

• Industry Promotion Research
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• v.4 no.2
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• pp.1-8
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• 2019

This research is a technology for cutting the insulation of the busbar (busbar) installed in the distribution panel or switchboard, the results of the study, first, the cutting unit and frame of the cutting unit including a housing attached to the upper and lower cutters, respectively Busbar coating laser cutting machine is installed on the top, characterized by consisting of a stopper for adjusting the coating cutting distance of the busbar. Second, the frame is installed with the guide bar in the longitudinal direction at the top so as to be located at the rear side end of the table, the post is installed vertically at the front and rear at the upper middle part, respectively, and cut to the table at the outer side of the front post. It is characterized by the formation of holes. Third, the supporter is fixedly installed on the upper part of the guide bar arranged in the frame, and is characterized by consisting of a cylinder and a support plate. The meaning of this study is to prevent the safety accidents of workers, to improve the efficiency of cutting work, and to prevent the occurrence of scratches on the surface of the busbar.

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.1
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• pp.40-48
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• 2017

RC flat plates may be governed by a serviceability as well as a strength condition, and a construction sequence and its impact on the distributions of gravity loads among slabs tied by shores are decisive factors influencing short and long term behaviors of flat plate. Over-loading and tensile cracking in early-aged slabs significantly increase the deflection of a flat plate system under construction, and a reshoring work may be helpful in reducing slab deflections by controlling the vertical distributions of loads in a multi-shored flat plate system. In this study, a effect of reshoring works on short and long term deflections of flat plate systems are analyzed. The slab construction loads with various reshoring schemes and slab design and construction conditions are defined by a simplified method, and the practical calculation of slab deflections with considering construction sequences and concrete cracking and long term effects is applied. From parametric studies, the reshoring works are verified to reduce slab deflections, and the optimized conditions for the reshoring works and slab design and constructions are discussed.

• Journal of Korean Society of Forest Science
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• v.99 no.4
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• pp.625-632
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• 2010

This study was carried out to analyze the yarding productivity and cost of the man-power operation by plastic chute, the yarding operation by yarder attached in tractor (Chuncheon Tower-yarder) and yarding operation by Tower-yarder (RME-300T) in forest tending operation. As result of average yarding timber volume was 0.67 $m^3$, 3.8 $m^3$ and 7.3 $m^3$ per day and man, respectively. And, when an yarding timber volume was 60 $m^3$/ha, the total yarding time including setting up and dismantling time of the plastic chute and yarding line was 20 days and 2 hours, 7 days and 1 hours and 21 minutes, 3 days and 4 hours and 27 minutes, respectively. The operation costs were 104,448 won/$m^3$, 29,968 won/$m^3$ and 23,032 won/$m^3$, respectively. And, when yarding timber volume was 60 $m^3$/ha, the total operation cost including setting up and dismantling time of the plastic chute and yarding line was 7,429,173 won/ha, 2,431,573 won/ha and 1,610,672 won/ha, respectively.

• 대한방사선방어학회:학술대회논문집
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• 2009.04a
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• pp.278-279
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• 2009

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.6
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• pp.1937-1944
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• 2014

In recent years, common ducts have been installed and operated in the sidewalls of tunnels to prepare for emergencies in tunnel construction and maintenance. The installation of common ducts is done mainly by humans. Problems with cost increases are inherent in tunnel construction by humans due to the safety risks and the economic inefficiency of humans performing construction activities. Among the problems that arise are poor illumination due to the use of temporarily installed electricity, the risk of accidents due to the confined workspaces, and workers avoiding work tasks because of the poor environment in tunnel. Ideas for solving these problems were developed using a value engineering (VE) process, and mechanized construction was identified as a promising solution. To verify the effectiveness of mechanized construction of a common duct in tunnels, experimental construction work was carried out, and mechanized construction was proven to directly improve the constructability and economic efficiency of common duct construction. In addition, reducing human involvement in common duct construction in tunnels is expected to improve safety, and because of the continuous concrete placement technique used, the finish and appearance of the ductwork are improved.

• Journal of Energy Engineering
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• v.25 no.2
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• pp.86-93
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• 2016

The existence of high temperature equipment such as steam pipe, deaerator, steam storage tanks and main steam stop valves makes relatively higher workplace temperature in a power plant of the turbine building. In order to cool down the air temperature in the turbine building, the outside air flow with lower temperature passes through the window and the hotter air in the building is extracted to the outside by installing the ventilation fan on the roof. Nevertheless, higher temperature regions near the high temperature equipment still exist in the turbine building and additional fans for the temperature reduction in the higher temperature region should be examined for the optimal location and mass flow rate. The purpose of the present study is to suggest the optimized location and capacity of the additional ventilation fans for a comfortable working environment. From the present study, it has been elucidated that the additional ventilation fans might be located near the high temperature deaerator and it could reduce the mean temperature in the turbine building by $3.0^{\circ}C$ and the temperature near the deaerator could be reduced by $4.2^{\circ}C$.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.171-171
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• 2011

헬륨냉동계통은 연구용 원자로인 하나로에서 냉중성자를 생산할 수 있도록 설치된 수조내기기 내의 감속재인 수소가 정상적으로 열 사이펀을 유지하기 위한 주요 계통이다. 헬륨냉동계통은 헬륨가스를 압축하는 헬륨 압축부분과 헬륨가스를 팽창시켜 저온을 생성시키는 헬륨 팽창부분으로 나누어진다. 헬륨 압축부분은 두 개의 스크류가 맞물려 회전하면서 약 1.05 bar(a)의 헬륨가스를 최대 13 bar(a)까지 압축시키는 압축기가 있으며, 헬륨 팽창부분인 냉동박스의 팽창 터빈은 self-acting gas bearing에 의해 구동되며, 저온모드 운전 시작시 헬륨 압축부분에서 일부의 가스는 팽창 터빈 축(shaft)으로 유입되어 회전속도가 서서히 증가하면서 고속으로 회전하여 극저온의 헬륨가스(14~18 K)를 생성하는 주요 기기이다. 헬륨을 팽창하는 부분인 냉동박스 내로 헬륨 압축가스를 유입하기 전에 압축된 헬륨가스 내 불순물의 순도를 분석하여 냉동박스의 주요 부품인 팽창터빈의 운전에 영향을 미치지 않는 것이 가장 중요하다. 따라서 헬륨 저압측에 헬륨가스 내 불순물 즉, 수소($H_2$), 수분($H_2O$), 질소($N_2$), 탄화수소류(CxHy) 및 오일(Oilaerosol) 등의 함량을 분석하기위해 가스 분석기가 설치되어 있으며, 냉동박스 내로 유입되기 전에 헬륨압축에서 순환되는 가스 내 불순물인 수분, 질소, 탄화수소류 및 오일은 10 vpm 이하이어야 하며, 수소 함량은 0.1 % 이내이어야 한다. 헬륨 압축부분에서 순환되는 가스의 불순물이 요구 조건에 만족하도록 헬륨 고압측과 헬륨 저압측에 cryogenic adsorber를 설치하여 가스 내 불순물을 제거하는 가스순도제어 작업을 수행해야 한다. cryogenic adsorber를 사용하기 위해서는 장치 내의 불순 가스를 공정진공도(1.33 X $10^{-3}$ mbar) 이하로 진공배기하는 작업이 매우 중요하다. 이는 계통의 헬륨가스가 오염되지 않도록 하는 것으로 cryogenic adsorber 내에는 액체질소를 충전하여 액체질소 온도에 노출된 활성탄층을 헬륨가스가 흐르면서 수분, 질소, 탄화수소류 및 오일 등이 제거된다. 이 논문에서는 헬륨냉동계통의 가스 순도 제어 작업을 통해 헬륨가스의 순도가 요구조건 이하로 만족하며, 팽창 터빈의 운전에 영향을 미치지 않음을 기술하고자 한다.

• Nuclear industry
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• v.15 no.11 s.153
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• pp.80-86
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• 1995

발전소 정비지원시스템 MAPS는 발전소의 가동률 향상과 안정적 운영에 직결되는 정비분야에 있어서, 발전소의 정비기록을 보다 효율적으로 유지하고 활용하기 위한 시스템으로, 기기데이터 관리, 결함보고서(TR) 및 작업의뢰서 관리, 예방점검 관리, 정비이력 관리 등의 기능모듈로 구성되어 있다. 93년 11월부터 연차적으로 국내 각 원자력발전소에 설치하기 시작한 MAPS는 금년 1월 월성원전을 끝으로 전 원전에 설치되어 운용되고 있다. MAPS의 개발경위와 기능, 그간의 운영현황 등을 들어본다.