• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.35 no.6
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• pp.483-488
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• 2007

The aerodynamic characteristics of FAST(Future Air Speed Transit) combined the body with tandem wing flying over nonplanar ground surface are investigated by using a boundary element method. To validate the present method, results of the present analysis are compared with the experiment and other numerical results. The arrangement of the tandem wing is determined to secure sufficient aero-levitation force and the stability through the analysis of the aerodynamic characteristics of the FAST. The FAST has the maximum lift characteristics when the tandem wing with lower endplate is located at the front side and the rear side of the body. The stability of the FAST can be secured by using the flaperon of the tandem wing.

• KOREAN POULTRY JOURNAL
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• v.39 no.1 s.447
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• pp.102-106
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• 2007

저병원성조류인플루엔자(LPAI)가 국내에 유입된 지 10년여 만인 지난 2006년 11월 전북 익산지역에서 고병원성조류인플루엔자가 발생되었다. 고병원성조류인플루엔자(HPAI)가 2003년 충북 음성에서 발병된 지 3년만이다. 고병원성 조류인플루엔자(HPAI)가 어디서 어떻게 감염 되었는지는 오리무중 이란다. 철새, 외국인 노동자, 해외 여행객, 아니면….질병이 발생하는 데는 질병을 일으킬 수 있는 원인이 있으며, 농장에서는 원인이 될 수 있는 요소를 한가지씩 제거해 나가야 한다. 질병의 전파의 요소로 여겨지는 것은 다음과 같은 것이 있을 수있다. 분변, 방문객 및 방문차량(사료 운송차, 약품배달차, 왕겨차, 계분운송차, 사계(死鷄)수거차량), 축산기구, 농장의 위치, 야생조류, 설치류, 외부기생충, 난계대 전염병, 외부에서의 닭 유입 등이 있다. 조류인플루엔자(AI)라고 해서 다른 질병과 달리 특별한 방역 방법이 있는 것은 아니다. 어느 질병이든 농장에서 방역에 대한 기본개념을 알고 기본적인 원칙을 지키면 되는 것이다. 그 기본이라는것은 외부로부터 농장의 통행을 막고 끊어서 통하지 못하게 하는 차단(遮斷) 방역이다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1989.10a
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• pp.9-22
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• 1989

본 연구에서는 수송 네트워크에서의 최대효용경로문제를 정의하였다. 그리고 비순환적인 수송 네트워크에서의 최대효용경로를 구하는 최적해법을 제시하였다. 일반적인 수송 네트워크에서 각 경로가 가지는 효용가치는, 그 경로를 설치함으로써 연결 가능하게 되는 모든 마디의 쌍이 얻는 효용의 합이다. 즉, 일정한 출발지로 부터 도착지에 이르는 운송노선이 중도에 경유하는 모든 지점들 사이에 요구되는 운송 서어비스를 충족시켜줌으로써 얻게되는 효용의 합이 최대가 되도록 경유지를 정하는 문제를 최대효용경로 문제로 모형화하였다. 그리고 주어진 수송 네트워크가 비순환적인 경우라 하더라도 정의된 최대효용 경로 문제가 NP-hard 임을 3-Satisfiability문제를 이용하여 보였다. 또한 Shortest Path와 K-th Shortest Path를 이용하여 최적해법을 개발하였다.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.134-135
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• 2019

국제핵융합실험로(ITER)를 위해 한국이 설계, 제작, 시험, 운송, 설치 및 운전할 컨버터 마스터 제어계통(MCS: Master Control System)은 하부에 컨버터들과 이들을 제어하는 로컬제어계통으로 구성되어 있다. 이들 중 많은 수의 PF 컨버터들과 로컬제어기들은 중국에서 제작하고 있다. 마스터 제어계통의 제어기를 ITER Site에 운송하기 전에 중국이 제작한 컨버터 로컬제어기들과 한국이 제작한 마스터 제어기의 통합시험을 통하여 상호 제어 신호와 데이터 통신 및 기타 기능이 설계요건에 맞게 원활히 작동되는지 확인 및 성능검증을 위한 시험계획을 수립하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.9
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• pp.82-87
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• 2008

Faster, safer and cheaper mailing of the postal matter is essential for surviving in the competitive market of home-delivery service. In the past, the domestic delivery business has been nu by only a few number of companies. But more and more number of companies including medium size ones are participating in the business, and the competition is getting severe. This paper proposes a method to select the optimal location of mail distribution centers that minimally connect the local mail centers of some major cities in Korea using the Steiner Tree theory, which is about connecting a finite number of points with a minimal length of paths and has been used in the distribution system optimization and optimal routing of the transmission lines of the electric power system. By using Steiner Tree theory in finding the best location of the postal delivery hub, we may expect the reduction of transportation cost and the increase of profit, resulting in acquiring the superior position in the competitive delivery business. It is expected that we may use the Steiner Tree theory in finding the best location of the electric power substation for the nott higher EHV(extreme high voltage) transmission network.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.74-87
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• 2020

Overloaded trucks are the main source that threatens road safety and directly affects the reduction of pavement life. The On-board truck scale is the only equipment that could prevent overloading by measuring and adjusting the loading weight before driving. Legislation is needed to encourage its installation so that the driver can prevent overloading. In this study, an on-board truck scale system was installed on 30 dump trucks for transporting construction waste, such as soil and aggregates, which are major loads of 36.55% for overloading, and the trucks were monitored remotely. The overload prevention effect was analyzed by comparing driving data for 1 month before distribution of the weight display app that can recognize the weight to the driver and 1 month after distribution. After installation, overloading could be 6.1% reduced, and the transportation efficiency could be increased by checking the weight provided from the On-board truck scale system.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.232-239
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• 2001

Young Jong Grand Bridge is approach traffic road of New Inchon International Airport which covers hub airport function in northeast asia. The total span length of this bridge is $4,420{\cal}m$ and this main bridge type is, the first in the world, Double Deck Self Anchored Suspension Bridge, designed as double deck systems to be arranged by road and railroad. Approach bridges to be connected with main span also are composed double deck steel truss and steel box girder to consider a continuity with this span. Our company erected $1,375{\cal}m$(about 60,000tons) of double deck steel truss bridge type which is composed by 6 traffic lane on upper deck and 4 traffic lane and Double track railroad on lower deck. The original installation method of this bridge was planed to install about 75 meters bridge blocks to use floating crane, after temporary bent was constructed between permanent piers. But this method which had to construct many temporary bents in the sea had the matter that construction periods can become lengthen and construction cost can be risen. To overcome the uncertainty to ensure high qualify of bridge and economic project execution, our company developed new bridge erection method to assure both quality control and economic construction work. The new erection method which was developed by us was one that could transport and install long bridge block, $120{\cal}m$ unit at a time and that temporary bent was not required. We hope that this paper is used as technical data which will erect bridge in the western sea and others marine region.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.11
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• pp.1446-1455
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• 2016

The recent increase of fresh farm products, hazardous cargos, and high-priced goods in marine transportation has caused an increased demand of cargo owners and shipping companies with regard to the monitoring of the location and state of cargo. To meet this increase, numerous technologies are being studied for the monitoring of the cargo state. Cargo containers on a ship are loaded on a ship's deck and in a ship's hold, which is located under the deck. However, Since the developed technologies mostly transfer the container status information that collected by mobile communication, it costs a lot to install communication infrastructure on ship. And the ship's hold is completely sealed with a cover, and communication with the reader positioned at the ship's bridge is difficult. Therefore, most existing studies on container monitoring on ships have focused on the monitoring of containers loaded on a ship's deck. Accordingly, this study suggested system configuration for the monitoring of containers in a ship's hold using IP-RFID technology. The suggested system configuration was tested on an actual ship under navigation, and the test results are given in this study. The test results verified that the monitoring of containers in a ship's hold using IP-RFID technology is effective.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.4
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• pp.1603-1610
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• 2013

The high distribution costs causes the increasing of truck delivery time and cost, which results in reducing industrial competitiveness incre. Therefore, This study conducted research into the introduction of truck only lane for reducting distribution costs. The site of study is Keumho JCT ~ Namgumi IC of Kyeongbu Expressway which has much truck traffic because of industrial complex. Thus, this study deduced travel speed and density in each scenaria(base, bus only lane, truck only lane, two only lane). According to analysis result, if a truck only lane install, the average driving speed is 83.4km/h as a highest and density 22.47veh/km as lowest. it means that if the truck only lane is install, it will be positive influence on the expressway

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.05a
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• pp.245-250
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• 2002

보일러의 압입송풍기 토출구로부터 나온 연소용 공기를 버너가 있는 장소로 이동시키기 위해 설치하는 풍도(air duct)는 보다 원활한 연소용 공기의 공급과 효율적인 운송을 통하여 연소로에서 배출되는 연소 배출물인 SOx, NOx 등이 최소가 될 수 있도록 연소운전조건을 개선하여 연소로 내부에서의 화염을 안정화시킴으로 고효율 보일러의 운전환경을 제공할 수 있기 때문에 설계 단계에서 충분한 연구가 필요하다고 보여진다.(중략)