대피선 최소화를 고려한 광역·도시철도 급행화를 위한 고성능 열차 가감속도 분석

고경준,김정태,김무선,장동욱,홍재성,류상환,정종덕 대한교통학회 2015 대한교통학회지 Vol.33 No.6

As shown by the popularity of the rapid train in the Seoul Metro Line No. 9, the demand for the rapidization of the metro transit has been continuously increased. However, it needs tremendous cost to construct new additional infrastructures to the existing line for the rapidization. In order to overcome the problem, utilizing the existing infrastructures such as crossing tracks as railroad sidetracks can be considered to be a good method of reducing the cost. In this case, there is a way exploiting the existing train as an express train and the advanced train, which increases both acceleration and deceleration, as a local train , but achievable acceleration and deceleration have not been analyzed rigorously. In this paper, we analyze feasible ranges and optimal values of both acceleration and deceleration of the advanced train analytically when we consider the rapidization of the metro transit utilizing the existing infrastructures and verify the results in Seoul Metro Line No. 3. Simulation results show ranges and optimal values of achievable acceleration and deceleration exist when minimum gap between an express train and a local train is smaller than 40 seconds. 서울 지하철 9호선의 급행열차에 대한 높은 인기에서 볼 수 있듯이, 광역·도시철도 급행화에 대한 수요는 꾸준히 증가하고 있다. 하지만, 기존 노선에 건설된 노선을 급행화하기 위해서는 인프라를 추가적으로 설치하여야 하며 많은 비용이 소요된다. 이러한 문제점을 극복하기 위해서는 유치선, 건넘선 등 기존에 구축된 인프라를 최대한 활용해서 대피역의 역할을 해야 할 필요가 있다. 이 경우에 급·완행 열차의 교차점을 줄이기 위해, 기존 열차는 급행열차로 활용하고 가·감속도를 증가시킨 고성능 열차를 완행 열차로 투입하는 방법이 있지만 실현 가능한 고성능 열차의 가·감속도와 최적의 가·감속도를 분석하는 현재까지 연구는 진행되지 않았다. 본 논문에서는 기존 시설을 최대한 활용하여 급행화 방안을 추진할 때, 고성능 열차의 실현 가능한 가·감속도의 범위를 수식적으로 분석하고 그것을 서울지하철 3호선에서 검증한다. 실험결과는 열차 간 최소간격이 40초 이하일 때, 실현 가능한 가·감속도의 범위가 존재한다는 것을 보여준다.

급행화 환경에서 대피역과 열차 가감속도와의 관계 분석

고경준(Kyeongjun Ko),김무선(Moosun Kim),김정태(Jungtai Kim),장동욱(Donguk Jang),유환규(Hwankyu Yu) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.5

도시·광역철도의 가·감속 성능향상을 위한 하이브리드형 견인시스템의 개념 설계 및 적용 타당성 분석

정거철,박현준,이형우,이주 한국철도학회 2019 한국철도학회논문집 Vol.22 No.4

This paper is a conceptual design and application feasibility analysis of a hybrid traction system forimprovement of acceleration and deceleration performance of urban and metropolitan railway. Due to economic developmentin the metropolitan area, the commuting time and scheduled speed have decreased. This has greatly reducedspeed competitiveness and significantly reduced the modal share rate. To solve these problems, a study was conductedto improve the performance of acceleration and deceleration as a means of express service of urban and metropolitanrailway. A conceptual design of a hybrid type traction motor, which can be applied to both the motor car and trailer carfor enhanced acceleration and deceleration, was carried out. A permanent magnet synchronous motor with better efficiencyand output density than those of an induction motor is applied to the motor car and a linear induction motor issuggested for application to the trailer car. In conclusion, the proposed hybrid type traction motor, which converts allcars to motor cars, improve the acceleration and deceleration performance.

Genedia HCV ELISA 3.0, Rapid 및 Confirm 4.0 시약의 진단적 유용성 평가

임영애,전희선,곽연식,조영식,이동순 대한임상병리학회 1998 대한임상병리학회지 Vol.18 No.2

Evidence for relaxed selection of mitogenome in rapid‑flow cyprinids

Yao Lu,Hu Xing,Dongsheng Zhang 한국유전학회 2019 Genes & Genomics Vol.41 No.7

Background Hypoxia adaptation is developed in many fish species, which helped them to habitat most of water bodies. However, fishes living under high oxygen concentration may lose this feature. Rapid flows provide high level and stable dissolved oxygen, which facilitate organism’s oxygen supply and energy production. Previous studies showed that fish species from rapid-flow habitats exhibited lower hypoxia tolerance compared with fish from intermediate- and slow-flow habitats. Mitochondrial genomes code 13 key components in oxidative phosphorylation pathway; these genes may be under relaxed selection in rapid-flow species. Objectives The primary objectives of this study is to investigate the evolutionary patterns of the 13 mitochondrial OXPHOS genes among nine cyprinids from different water bodies and to test the hypotheses that mitochondrial OXPHOS genes may experience relaxed selection in rapid-flow habitats. Methods We classified nine cyprinid fish species into three groups based on their habitats: rapid-flow, intermediate-flow and slow-flow. To detect relaxed selections, we investigated the 13 protein-coding genes with codon evolution programs RELAX; to estimate evolutionary rates among the cyprinids, free-ratio model in Codeml program was applied; Branch-site models were applied to detect positive selection sites. The polymorphisms of homologous sites were evaluated with PROVEAN program and projected to 3D structure prediction of the proteins using SWISS-MODEL. Results We found that nine out of the 13 genes are under relaxed selection in rapid-flow species. Furthermore, dN, dS and dN/dS are relatively increased when compared with those of intermediate-flow species. More amino acid polymorphic sites are presented in rapid-flow species than in intermediate- and slow-flow species. Furthermore, rapid-flow species had more deleterious substitutions than other groups. 3D structure prediction of these proteins and projection of the polymorphic sites indicated that these sites were randomly distributed, suggesting relaxed functional constraints of these proteins in rapid-flow species. Conclusion Our results suggest that mitochondrial genes are under relaxed selection in rapid-flow cyprinids.

B형 간염표면항원 및 항체 검사를 위한 Genedia Rapid법의 비교 평가

오지하,김신규,윤현정,민형식,이혜림,최태열 대한임상병리학회 1999 대한임상병리학회지 Vol.19 No.1

속경성 재료와 석분슬러지를 활용한 도로 굴착복구용 되메움재의 특성 평가

이종원,백철민 한국도로학회 2022 한국도로학회논문집 Vol.24 No.6

PURPOSES : In this study, to improve the quality and construction performance of backfill materials for road excavation and restoration, the basic properties of rapid-hardening materials and stone sludge are analyzed to propose an optimal mix design. METHODS : To utilize rapid-hardening materials and stone sludge as controlled low-strength materials for pipeline construction in downtown areas, specimens were prepared for each compounding condition of fast-hardening materials. Flow, slump, and compressive strength tests were performed at various setting times. Subsequently, the physical and mechanical characteristics of the rapid-hardening backfill material for each mixing factor were analyzed. RESULTS : When ultrafast hardening cement and stone sludge are used, a setting time exceeding 30 min is required for a water–binder (W/B) ratio of 200% or higher. Considering the economic feasibility of ultrafast hardening cement, a W/B of 300% is considered the most suitable when high-performance superplasticizer and retarders are mixed. A flow test was performed on the rapid-hardening backfill material and the results show that if the mixing time exceeds 10 min, then the fluidity decreases rapidly, which necessitates a higher amount of superplasticizer. When ultrafast hardening cement is used, the initial strength (based on 4 h) is 0.7 MPa or higher for all formulations at a W/B ratio of 300%, and the compressive strength decreases slightly as the amount of superplasticizer is increased by 0.1%. CONCLUSIONS : Based on the fluidity and strength of the backfill material, which is composed of a rapid-hardening material and stone sludge, the most optimal performance is achieved when ultrafast-hardening cement with a W/B ratio of 300% is used in addition to a highperformance fluidizing agent 0.3% (wt./B) and retarder 0.2% (wt./B).

RAPID-N을 이용한 국내 지진 발생 시 화학시설 Natech 위험성 평가

박제혁,연응진,이학태,정승호 한국안전학회 2019 한국안전학회지 Vol.34 No.4

Accidents occurring due to natural disasters in chemical process facilities where technologies are concentrated can cause secondary damage. The concept of the relationship between natural disasters and highly intensive technologies has evolved into the Natech (Natural Hazards Triggered Technological Disaster) research. Currently, the number of earthquakes is increasing all over the Korean peninsula. To assess the risk of Natech when an earthquake has occurred in South Korea, the Rapid Natech Risk Assessment Tool (RAPID-N) developed by the European Commission’s Joint Research Center (EC JRC) was used in the present study. The RAPID-N can be used for Natech risk assessment based on mapping and can be utilized for sufficient preparation for reduction of the effects of Natech accidents. A total of 261 chemical facilities actually existing in Pohang were initially analyzed to select eight facilities and the Pohang earthquake that occurred in 2017 was implemented in the RAPID-N utilizing the shake map. High risk areas were selected through Natech risk assessments for the selected eight work places and countermeasures for the areas were suggested. High risk areas exist depending on the location, since the damage influence ranges could be overlapped and each chemical facility has an independent probability of Natech. Therefore, studies on Natech emergency plans and emergency evacuation routes should be actively conducted considering such high risk areas. The present study was conducted to demonstrate the feasibility of Natech risk assessment in South Korea through the RAPID-N. These findings can be used as a reference material to lay a foundation for Natech risk assessment and related policies in South Korea.

Human Immunodeficiency Virus (HIV) 검출물 위한 초고속 이단계 PCR 진단법

이동우,김을환,유미선,김일욱,윤병수,Lee, Dong-Woo,Kim, Eul-Hwan,Yoo, Mi-Sun,Kim, Il-Uk,Yoon, Byoung-Su 한국미생물학회 2007 미생물학회지 Vol.43 No.4

For the detection of human immunodeficiency virus (HIV), ultra-rapid real-time PCR methods were developed. The target DNA sequences were used 495 bp HIV-1-specific env gene (gi_1184090) and 294 bp HIV-2-specific env gene (gi_1332355). Ultra-rapid real-time PCR was peformed by $Genspector^{TM}$ (Samsung, Korea) using microchip-based, $6\;{\mu}l$ of reaction volume with extremely short running time in only 2 steps (denaturation, annealing/extension) in each cycle of PCR. Total reaction for 30 cycled ultra-rapid PCR detection including melting temperature analysis was completed in 7 min and 30 sec. The HIV-1-specific 117 bp-long or HIV-2-spe-cific 119 bp-long PCR products were successfully amplified from the minimum of template, $2.3{\times}10^3$ copies of each euv gene using 30 cycled two-steps ultra-rapid PCR. This kind of ultra-rapid real-time PCR method would be useful not only for the rapid-detection of HIV, but also rapid-detection of other pathogens. 인간면역결핍바이러스(Human Immunodeficiency Virus; HIV) 진단을 위한 초고속 실시간 PCR법을 개발하였다. 검출 대상의 DNA 염기서열은 495염기 HIV-1 특이 env 유전자(gi_l184090)및 294염기 HIV-2 특이 env 유전자(gi_1332355)를 사용하였다. 초고속 실시간 PCR은 microchip에 $6\;{\mu}l$의 PCR 용액을 탑재하는 $Genspector^{TM}$ (Samsung, Korea)을 사용하였으며, PCR의 각 회전 중 단지 두 단계(denaturation, annealing/extension)를 극단적으로 짧은 시간을 주어 수행하게 하였다. 융점분석을 포함한 30회전의 PCR 검색 시간은 총7분30초 이내에 완료되었으며, HIV-1 특이 117염기와 HIV-2 특이 119염기의 PCR산물은 최소 $2.3{\times}10^3$개의 각 env 유전자로부터 30회전의 2단계 초고속 PCR에 의해 성공적으로 증폭시킬 수 있었다. 이러한 초고속 실시간 PCR법은 HIV의 빠른검색뿐 아니라, 다른 병원채의 빠른 검색에도 유용하계 적용될 수 있을 것이다.

Shrinkage cracking of styrene butadiene polymeric emulsion-modified concrete using rapid-hardening cement

Won, J.-P.,Kim, J.-H.,Park, C.-G.,Kang, J.-W.,Kim, H.-Y. Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.112 No.4

<P>This study was performed to resolve the problem of cracks caused by the rapid hydration heat produced during the early setting stages of rapid-hardening cement. To address the hydration heat of rapid-hardening cement, we prepared a modified rapid-hardening cement using calcium sulfoaluminate clinker combined with a styrene butadiene (SB) polymer. The performance of SB polymeric emulsion-modified concrete made from modified rapid-hardening cement was assessed by determining shrinkage (change in length, and plastic and autogenous shrinkage). The modified rapid-hardening cement in combination with SB polymeric emulsion effectively reduced cracking. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>