• 한국안전학회지
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• 제30권4호
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• pp.128-134
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• 2015

The number of schools which have passed 30 years after the construction takes up 30% (5% falling to class D and E) in Korea. So, the offices of education across the nation conduct large works for the expansion, improvement and renovation of the school. But as the work takes a lot of time, the work is also conducted while the students are studying at the schools. The work at the school causes the noise, dust, vibration as the school often has the reinforced concrete structure. So, as the windows are closed to prevent the nuisance from hampering the education, the problems related to the illumination, ventilation, and control of humidity and temperature are give damages to students studying the school buildings. Actually, as the current renovation or expansion is conducted across the nation due to the implementation of the new education system and the resulting integration and construction of hub school, specialized school, meister school and it causes a lot of nuisance to the learning students and others, there are a lot of complaints from concerned people. Accordingly this study suggests the method of evaluating the factors which affect the learning environment such as the noise, dust or fine dust and reducing the nuisances to the level proper for the learning environment when the existing school is expanded, improved or renovated.

• 한국항만경제학회지
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• 제20권2호
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• pp.131-149
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• 2004

With trend of container ships becoming larger and faster, the environment surrounding ports in North-East Asia is rapidly changing. Korea's largest port of Busan processed more than 10 million 20- feet equivalent containers in 2003, surpassing the 10-million TEU mark for the first time in its three decades of operation. However, the Port of Busan , the world's third-largest port in 2002, was eclipsed by Shanghai since July in 2003. The first massive strike of truckers crippled the Korea's logistics system in May and in September, the Port of Busan suffered from the second strike of truckers and damage by a powerful typhoon. By contrast, the port of Shenzhen in China increased its container-processing volume by 39.9 percent to 10.65 million TEU in 2003, and Shanghai, which passed Busan in terms of container volume in the middle of last year, further consolidated its position as the world's No. 3 port with an annual volume of 11.28 million TEU. After all, Busan recorded an annual container volume of 10.40 million TEU, slipping to fifth in rankings in 2003 and Busan's bid to become a Northeast Asian hub has suffered a further setback as these chinese ports overtook the port of Busan. But the port of Busan is located in the main trunk liking North America, Europe and South-East Asia. Once the project of Busan Newport is accomplished and the railway between South and North Korea is connected to TCR and TSR, the Port of Busan will have the most potential to become the international logistics center as the starting point of the land and sea routes encompassing all over the world.

• 통상정보연구
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• 제14권3호
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• pp.559-583
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• 2012

본 연구는 인천국제공항이 국제항공화물운송에 있어서 동북아의 중심이 되기 위하여 국제물류주선업자의 국제항공화물운송 프로세스의 문제점과 애로요인, 개선사항 등을 조사 및 분석해보는 것이 필요하다는 전제하에 수행되게 되었다. 국제항공화물운송 프로세스의 여건은 수출 및 수입으로 구분하여 개별 프로세스별 소요시간과 만족도 그리고 프로세스 단계별 문제점을 분석하였다. 그 결과 국제항공화물운송 수출프로세스의 소요시간이 수입프로세스의 소요시간 보다 약 1시간 더 소요되는 것으로 나타나 국제항공화물운송의 프로세스를 개선하기 위해서는 수출보다는 수입부문의 프로세스 개선이 시급한 것으로 나타났다. 또한, 이상의 사항을 종합하여 항공화물 정보시스템 구축, 화물조업의 경쟁력 확보, 물류표준화 개선 등이 향후 개선되어야할 과제로 도출하였다.

• 한국주거학회논문집
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• 제21권5호
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• pp.103-113
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• 2010

The post-war period has witnessed the emergence of new towns in a number of countries in Southeast Asia. The new town development in Malaysia started with Petaling Jaya (PJ) as a satellite town in 1953 to accommodate the rapid growing population of Kuala Lumpur (KL). Shah Alam (SA), Subang Jaya (SJ) are all located in the Klang Valley and act as an important social and economic development hub in the nation. New towns have been designed in accordance with the British town planning principles, which were based on the model of a modern ideal city. They constituted a new regional character because they were developed taking into consideration factors such as local technologies as well as site and, climatic conditions. The initial goal of the new town construction and planning, which focused basically on resettling squatters, was later changed to focus on the improvement of the quality of living. This phenomenon was related to the emergence of the middle class, which had grown rapidly ever since. With the public agencies, the private sectors have played an important role in providing viable and sustainable human units of settlement that address the new design issues of new town planning. The goal of this study is to identify the identity of the recent new town planning principles of Malaysia, how they were developed over time and how they were regionalized and transformed in a cultural and regional context. For the analysis, we chose 3 new towns which are located in Klang Valley and which are representative recent projects of two major housing development companies in Malaysia. To identify the planning principles, we analyzed these projects in the viewpoint of the urban space, street system, and housing blocks and units.

• Asian-Australasian Journal of Animal Sciences
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• 제26권1호
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• pp.19-29
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• 2013

Marbling (intramuscular fat) is an important trait that affects meat quality and is a casual factor determining the price of beef in the Korean beef market. It is a complex trait and has many biological pathways related to muscle and fat. There is a need to identify functional modules or genes related to marbling traits and investigate their relationships through a weighted gene co-expression network analysis based on the system level. Therefore, we investigated the co-expression relationships of genes related to the 'marbling score' trait and systemically analyzed the network topology in Hanwoo (Korean cattle). As a result, we determined 3 modules (gene groups) that showed statistically significant results for marbling score. In particular, one module (denoted as red) has a statistically significant result for marbling score (p = 0.008) and intramuscular fat (p = 0.02) and water capacity (p = 0.006). From functional enrichment and relationship analysis of the red module, the pathway hub genes (IL6, CHRNE, RB1, INHBA and NPPA) have a direct interaction relationship and share the biological functions related to fat or muscle, such as adipogenesis or muscle growth. This is the first gene network study with m.logissimus in Hanwoo to observe co-expression patterns in divergent marbling phenotypes. It may provide insights into the functional mechanisms of the marbling trait.

• 한국수소및신에너지학회논문집
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• 제31권4호
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• pp.387-394
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• 2020

A parametric study of a 2.5 kW class propeller type micro hydraulic turbine was performed. In order to analyze the internal flow characteristics in the hydraulic turbine, three dimensional Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model were used and the hexahedral grid system was used to construct computational domain. To secure the reliability of the numerical analysis, the grid dependency test was performed using the grid convergence index method based on the Richardson extrapolation, and the grid dependency was removed when about 1.7 million nodes were used. For the parametric study, the axial distance at shroud span (L) between the inlet guide vane and the runner, and the inlet and outlet blade angles (β₁, β₂) of the runner were selected as the geometric parameters. The inlet and outlet angles of the runner were defined in the 3 spans from the hub to tip, and a total of 7 geometric parameters were investigated. It was confirmed that the outlet angles of the runner had the most sensitive effect on the power and efficiency of the micro hydraulic turbine.

• 한국항공우주학회지
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• 제38권10호
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• pp.955-965
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• 2010

초소형 무인기 추진용 MH-75 프로펠러는 자유와 설계기법을 이용하여 설계변수인 허브팁 비, 비틀림각 분포, 최대 캠버의 위치와 크기 그리고 시위 길이를 변화시키며 설계 요구조건을 만족하도록 공력설계 되었다. MH-75 프로펠러는 주파수영역 패널법을 이용하여 설계요구조건을 만족시키고, 다양한 초소형 무인기에 적용이 가능하도록 정지추력 특성과 비행속도 및 회전수 변화에 따른 성능 특성을 예측하였다. 그리고 MH-75 프로펠러의 공력해석 결과를 검증하기 위해 프로펠러의 추력특성에 대한 풍동시험을 수행하였다. MH-75 프로펠러의 추력 성능은 설계요구조건을 만족하였으며, 저레이놀즈 수 영향을 고려하기 위한 2차원 익형 해석용 XFOIL 프로그램에 비해 3차원 효과를 고려하는 주파수영역 패널법을 이용하는 것이 비교적 풍동시험 결과와의 오차가 적음을 확인하였다.

• 한국항해항만학회지
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• 제30권1호
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• pp.1-8
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• 2006

1988년에 교통안전특정해역으로 설정되어 운영 중인 여수${\cdot}$광양항은 부산항과 더불어 동북아 중심항만(Hub Port)으로서 향후 2011년까지 총 33개의 컨테이너 선석 등이 개발 추진 중에 있다. 또한 해상교통량이 급격히 증가하고 있으며, 선박의 대형화, 고속화로 인하여 대형 사고의 발생우려가 상존하는 지역이다. 본 연구에서는 여수${\cdot}$광양항의 미래 지향적인 안전한 해상교통환경을 조성하기 위한 체계적이고 종합적인 선박안전운항 방안을 마련하기 위해서 여수${\cdot}$광양항 입출항 항로에 대한 해상교통환경을 면밀히 분석${\cdot}$평가하여 해양사고 예방을 위한 종합적인 해상교통안전체제 구축에 필요한 문제점을 도출한다.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2006년 춘계학술발표회
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• pp.205-240
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• 2006

In today's world economy, technology and knowledge have become the key words for value creation. Since 1998, various research institutions and universities in Korea, with support from Small and Medium Business Administration, have buckled to establish and operate incubating centers in order to foster such industries. Even though these centers have been operated in accordance with the purpose of the establishment, it has been over six years now, and it is necessary to evaluate its overall performance before moving on. Incubating a venture company results in not only technology innovation, but also jobs creation and economic growth. Knowing the importance of that, a government, at all levels, has supported the incubating centers as the most effective way to support venture companies in Korea. Incheon now plays a great role as a hub of logistics and trade in North East Asia. In order to nurture the city as the center of Korean economy, the city of Incheon has financially supported various incubating centers in the city, in an effort to incubate potential venture companies with lack of business experiences. It is imperative to find out what these companies need and how they evaluate the system at this point to develop a guiding principle of its operation as well as a careful selection process of a company in the future. In section II of this research, a concept of an incubating center is defined. An objective, a policy of its operation as well as its structure are explained in this chapter with case studies of Incheon College. 'Resources' are divided into human resources and material resources. And the survey that 71 different companies (out of 164 companies in 10 different incubating centers) have participated in is included in this section as well.

• 한국항행학회논문지
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• 제4권2호
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• pp.103-113
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• 2000

유연체 부착물을 갖는 인공위성의 수학적 모델링에 관한 방법은 몇 가지들이 있다. 본 논문에서는 FEM에 비해 차수가 낮아 계산시간을 줄일 수 있는 근사화 방법중 하나인 추측모드법을 사용한 하이브리드 라그랑지 방정식을 유도하였다. 이것들은 각속도에 관한 세개의 식들과 유연변위에 관한 두개의 식들로 이루어지며, 위성 본체와 태양전지판의 상호작용을 표현한다. 자세제어에 있어서, 제어법칙은 제어입력뿐만 아니라 진동억제를 포함한 성능지수를 최소화하도록 설계하였다. 이 목적을 위해 본 논문은 LQG와 LQG/LTR 제어기를 사용하였고, 결과로는 진동억제를 고려한 소각선회 성능을 보여준다. 특히, 본 논문에서는 특이시스템을 특이값 분리에 의한 비특이시스템 가정법을 통한 LQG/LTR 설계를 보여준다.