• 전산구조공학
• /
• 제22권2호
• /
• pp.7-15
• /
• 2009

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.3046-3051
• /
• 2011

The third-rail system is an important device supplying power directly to the Maglev train through physical contact with the collecting shoe. It is directly related to safety and reliability for the running of Maglev. However, most the third-rail system used in Korea depend on foreign product or technologies, Korea Urban Maglev in the development of appropriate power feeding is urgent. In particular, the turnout section is the weakness point in the system because bending force by turnout section movement and fatigue caused by repetitive motion as well as the expansion by temperature, the forces by Maglev collecting shoe is added th the third-rail. Therefore, this paper proposes the third-rail system appropriate for Korean Urban Maglev of turnout section. To verify the structural stability of POSCO ICT third-rail system, the finite element analysis and physical testing was performed. The third-rail is fixed on each side of the turn-out section steel structure by epoxy insulation supporter and the integral behaviors are occurred. Therefore, the maximum horizontal displacements of each support are investigated and then, it is applied to finite element model of the third-rail to investigate the moments and stress. Also, the bending test about one million times and Expansion Joint for the third-rail was performed. The third-rail system safety and reliability was identified by test line on Korea Institute of Machinery & Materials in Deajeon for under the actual usage environment such as the Maglev and turn-out operation.

• 한국철도학회논문집
• /
• 제18권4호
• /
• pp.335-343
• /
• 2015

분기기는 선로가 분기되거나 또는 교차하는 지점에 설치되어 열차의 이동 방향을 안전하게 변경하는 역할을 한다. 그러나, 운영 환경에 따라 비정상적인 힘이 분기기에 발생할 경우, 정확한 진단 및 검측을 실시할 수 없는 단점이 있다. 또한 분기기의 전환력을 측정하는 대부분의 장치는 국외 수입에 의존하며, 단순히 전환력 측정값으로 데이터가 한정됨으로서 분기기와 전기선로전환기간의 이상 상태, 운영 및 유지보수를 위한 데이터 등에 활용하기에 불충분한 것으로 조사되었다. 본 논문은 국내에서 사용중인 전기선로전환기의 전환기능과 쇄정기능의 특성 분석을 통해 기존에 사용된 분기기 전환력 측정의 문제점을 제시한 후, 이를 해결하기 위한 센서 활용 분기기 전환력 측정 방법을 제시한다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2013년도 춘계학술대회 논문집
• /
• pp.1575-1576
• /
• 2013

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2006년도 춘계학술대회 논문집
• /
• pp.21-26
• /
• 2006

• 대한가정학회지
• /
• 제37권12호
• /
• pp.59-67
• /
• 1999

This study analyzed firefighter's actual wearing condition of turnout gear The results are as fellows: 1. When a firefighter is employed, Korea applies only the minimum of firefighters stature and weight but America applies both the minimum and the maximum. The choice of size is highly related with stature more than chest circumference. 2. The satisfaction degree of thermal barrier is very low, 3%. They used rubber gloves rather than heatproof gloves. This is more serious in small country like 'up', 'myun' than in cities. For laundering, they used sprinkling method with firefighting hose. Firefigthers hoped that their clothes could be classified tv the seasons and fire places. 3. frefighter had high unsatisfaction with the movement of hands and leges in the aspect of movement adjustability, air permeability, weight, body temperature regulation, and breathing in the hygenic aspect, fire resistance, thermal resistance property, water proof, chemical reactivity and electrical conductivity. Thev were also unsatisfied with water proof boots and gloves. They were generally satisfied with helmets but firefighters over 90kg of weight were rather unsatisfied. 4. The satisfaction degree for physical fitness was very low and the items with which they were not satisfied depend on physical features. 5. To develop turnout gear, they wanted changes in design, material and size. Reflection tape need to be replaced with high quality products and they wanted the use of velcro and zipper in fastening system.

• 도시과학
• /
• 제9권1호
• /
• pp.41-49
• /
• 2020

This study analyzed the factors affecting economic growth using multiple regression model and Geographically Weighted Regression in consideration of population, industry and employment, housing and political characteristics on economic growth by region. The analysis results are summarized as follows. First, the total employment growth rate, manufacturing employment growth rate, local election turnout and the level of party consensus between the central and local governments are having a positive impact on regional economic growth. Second, according to the GWR analysis, the population has a positive impact on economic growth in the southern region of Korea, and the increase in the total number of employees has a positive impact on the southern region of Gyeonggi Province, Gangwon Province, North Chungcheong Province and North Gyeongsang Province. Finally, the voter turnout of urbanites is positively affecting economic growth in South Chungcheong Province, Gangwon Province and the southern coast, while North Jeolla and South Jeolla provinces have a positive impact on economic growth as the parties of the central and local governments are equal. The results of this study may suggest the role of local government for regional economic development.

• 한국철도학회논문집
• /
• 제13권6호
• /
• pp.570-576
• /
• 2010

본 논문에서 우리는 Petri Net을 사용하여 철도 선로를 모형화 하는 문제를 다루었다. Petri Net는 병행적, 비동기, 분산, 병렬, 비결정론, 확률론 등의 특성을 가진 정보처리시스템을 기술하고 시스템의 동적거동의 특성을 연구하기 위해 고안된 도식적, 수학적 모델링 도구이다. 검증 사례로서, 한국형 경량전철시험선 선로를 철도 시설물의 구성품(세그먼트, 궤도, 분기기, 승강장)으로 모델링하고, 대피선이 있는 단일 궤도에서 두 대의 열차가 동일한 방향에서 함께 진행하고 있거나 반대방향에서 동시에 진행을 하지만 충돌을 하지 않는다는 것을 보장하면서 설정된 진로를 이동하는 Peri Net 모형을 구현하였다.

• 전기학회논문지
• /
• 제66권12호
• /
• pp.1821-1829
• /
• 2017

A point machine requires lots of time and attention in terms of maintenance, since it causes 40% of failures among the railway signaling devices. The senescence of the point machine critically matters to the overall turnout system. In this paper, we analyzed the aging characteristics of the point machine by using the switching current of the point machine. The analysis is done based on the switching current measurements of the point machines deployed in the Sehwa outdoor test site and the Korail Kyongbu line. It is expected that the analysis result can be utilized for real-time diagnosis in the aspect of the maintenance of the point machines and predicting abnormal operations.

• 의정연구
• /
• 제25권1호
• /
• pp.5-44
• /
• 2019

2018년 11월에 실시된 미국의 중간선거는 트럼프 행정부의 중간평가라는 의미를 가지고 있다. 트럼프 행정부의 이민정책은 미국의 라티노들에게 많은 영향을 미치고 있다. 많은 미디어에서 중간선거에서 라티노의 투표율이 증가할 것이며, 민주당후보들의 당선에 커다란 영향을 미칠 것이라고 예측했다. 본 논문의 목적은 라티노의 인구학적 특성, 지리적 인구분포 및 라티노 여론 등에 대한 논의를 바탕으로 중간선거에서 나타난 라티노의 투표행태를 살펴보는 것이다. 현재까지의 제한된 데이터를 분석한 결과 2014년 중간선거와 비교하여 대부분의 선거구에서 라티노의 투표율은 실제로 급격한 상승폭을 보였으며, 이는 민주당후보에 대한 지지로 나타났다. 이러한 현상은 라티노 인구비가 높은 지역에서 더욱 두드러지게 나타났다.