• Title/Summary/Keyword: Analysis of railroad R&D

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A cross - sectional analysis of scientific and technological performance for the railroad R&D (철도 R&D의 과학기술적 성과에 대한 횡단면 분석)

  • Park, Man-Soo;Bang, Yoon-Seok;Kwon, Yong-Jang;Moon, Dae-Seop;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.1582-1590
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    • 2011
  • An analysis of the railroad industry for R&D investments has been insufficient whereas there are lots of analysis of accumulation of technology, economic performances and ripple effects for macroscopic view and other industry of R&D investments. This study decided intellectual rights, patent, and paper as common indicators of scientific and technological performances for setting up performance targets through surveying and analysis of preceding study and verified a appropriateness of scientific and technological performances for railroad R&D 11 projects which were successfully finished. Preceding study has been set up performance targets by research investments as input, but this study made a performance target by model through a cross-sectional and residual analysis of performances of railroad R&D 11 Projects in applying research investments, capital investments, inner labor cost and inner labor cost per man and research time as inputs, and verified a validity and a empirical analysis through analysis of other project.

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An Empirical Analysis of the Railroad R&D Stock (철도 R&D Stock에 대한 실증적 분석)

  • Park, Man-Soo;Moon, Dae-Seop;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.13 no.5
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    • pp.528-534
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    • 2010
  • In the new growth theory, R&D stock is the third factor of production excluding a labor and capital. In this point, a R&D stock is located in a capital which is accumulated by money like existing capital and this is a knowledge capital. The effort for escalating this knowledge capital is R&D investment and R&D stock is an accumulation of this. A contribution degree of the economic growth and a return of R&D investments are analyzed by an estimation of relation R&D stock and a total factor of productivity. This study analyzed R&D stock of railroad R&D investments and compared R&D stock with a technical level. So, a technical level is proportionally escalated following escalation of R&D stock. and compared railroad industry weight on the GDP with a railroad R&D stock weight on whole industries R&D stock. According to a relatively small railroad R&D stock weight against the railroad industry weight, a continuous railroad R&D investment is needed.

A Study of Performance Target Setting of Regression point of view -Focusing on the Intellectual Right and a Paper for the Railway R&D (회귀적관점의 성과목표 설정에 관한 연구 -철도연구개발의 지식재산권 및 논문 성과를 중심으로-)

  • Park, Man-Soo;Kwon, Yong-Jang;Lee, Hi-Sung
    • Journal of the Korea Safety Management & Science
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    • v.12 no.3
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    • pp.321-326
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    • 2010
  • Government evaluate annually a performance of government's R&D(Research & Development) and decide a budget and progress. So, a performance target setting of R&D is very important at the planning, The basic performance target setting of railroad R&D is clear. However, a scientific and technological performance target setting of railroad R&D is very difficult and a reasonable level of it can not be judged. Therefore, this study will suggest a solution for a scientific and technological performance target setting of railroad R&D through regression analysis of successfully finished railroad R&D, after judging a reasonability of a scientific and technological performance through comparing railroad R&D with the other R&D.

An empirical Analysis of Scientific and Technological Performance for the Railroad R&D through the Cross-sectional Analysis (횡단면 분석을 통한 철도 R&D의 과학기술적 성과 실증 분석)

  • Park, Man-Soo;Bang, Yoon-Sock;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.14 no.3
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    • pp.285-294
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    • 2011
  • An analysis of railroad industry has been insufficient whereas there are lots of analysis of accumulation of technology, economic performances and ripple effects for macroscopic view and other industry of R&D investments. This study decided intellectual rights, patent, and paper as common indicators of scientific and technological performances for setting up performance targets through surveying and analysis of preceding study and verified a appropriateness of scientific and technological performances for railroad R&D 11 projects which were successfully finished. Preceding study has been set up performance targets by research investments as input, but this study made a performance target by model through a cross-sectional and residual analysis of performances of railroad R&D 11 Projects in applying research investments, capital investments and inner labor cost per man and research time as inputs, and verified a validity and a empirical analysis through analysis of other project.

The analysis of the railroad R&D investment and R&D Stock (철도 연구개발투자와 지식축적량 분석)

  • Park, Man-Soo;Lee, Hi-Sung;Moon, Dae-Seop
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.791-794
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    • 2009
  • Each nation of the world is intensively propelling the R&D investment to solve the financial crisis and worldwide economic recession occurred from last year. This means the world economic is under economic system based on the knowledge. So, The R&D is continuously propelled for possession of the technology through the R&D stock and which is core in the knowledge based economic system. In this world stream, our government is also increasing the R&D investment and checked the technology level through surveying the R&D stock and corn parison of each industry or world. The R&D investment of the railroad is continued but there is no data of the R&D stock. So, surveying the railroad R&D stock and comparing with korea industry is processed.

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Development of Accident Scenario Models for the Risk Assessment of Railway Casualty Accidents (철도 사상사고 위험도 평가를 위한 사고 시나리오 모델 개발에 관한 연구)

  • Park, Chan-Woo;Wang, Jong-Bae;Cho, Yun-ok
    • Journal of the Korean Society of Safety
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    • v.24 no.3
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    • pp.79-87
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    • 2009
  • The objective of this study is to develop accident scenario models for the risk assessment of railway casualty accidents. To develop these scenario models, hazardous events and hazardous factors were identified by gathering various accident reports and information. Then, the accident scenario models were built up. Each accident scenario model consists of an occurrence scenario model and a progress scenario model. The occurrence scenario refers to the occurrence process of the event before the hazardous event. The progress scenario means the progress process of the event after the hazardous event. To manage a large amount of accident/incident data and scenarios, a railway accident analysis information system was developed using railway accident scenario models. To test the feasibility of the developed scenario models, more than 800 domestic railway casualty accidents that occurred in 2004 and 2005 were investigated and quantitative and qualitative analyses were performed using the developed information system.

Development of Risk-Appearance Frequency Evaluation Model for Railway Level-Crossing Accidents (철도건널목 사고 위험도-발생빈도 평가모델 개발)

  • Kim, Min-Su;Wang, Jong-Bae;Park, Chan-Woo;Choi, Don-Bum
    • Journal of the Korean Society of Safety
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    • v.24 no.3
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    • pp.96-101
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    • 2009
  • In this study, a risk-appearance frequency evaluation model for railway level-crossing accidents is developed with the frequency estimation based on the accident history. It follows the worldwide common safety management approach and reflects the operation conditions and accident properties of the domestic railway system. The risk appearance frequency evaluation process contains a development of accident scenarios by defining the system configurations and functions, and a frequency estimation of hazardous events based on the accident history. The developed model is verified with the accident history during 5 years('03-'07) for 3 hazardous events: 'Being trapped in level crossing(Hl)', 'Crossing during warning signal(H2)' and 'Breaking through/detouring the barrier(H3)'. This risk appearance frequency evaluation model will be combined with a consequence evaluation model so as to offer full risk assessment for the railway accident. The accident risk assessment will contribute to improving the safety management of the railway system.

Numerical Analysis of Axial-Flow Cyclone Separator for Subway Station HVAC System Pre-Filter

  • Kim, Myung-Joon;Kim, Ho-Joong;Kwon, Soon-Bark;Kim, Se-Young;Kim, Jin-Kwan;Shin, Chang-Hun;Bae, Sung-Joon;Hwang, Sun-Ho;Kim, Tae-Sung
    • International Journal of Air-Conditioning and Refrigeration
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    • v.17 no.3
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    • pp.94-99
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    • 2009
  • In the Korean subway station, three types of pre-filters, which include auto filter, electrostatic precipitator (ESP) and auto cleaning demister, are widely used. However, these devices have some problems such as the difficulty of maintenance and high operating cost. In this study, axial-flow cyclone separator was employed as a pre-filter inside a heating, ventilation, and air conditioning (HVAC) system. 3-dimensional computational fluid dynamics (CFD) analysis was performed on a single unit axial-flow cyclone and coupled unit axial-flow cyclone. Calculated and measured pressure drop of the designed axial-flow cyclone were found be comparable to other types of pre-filters and the observed cut-off diameter was less than 10 micron. Considering lower operating and maintenance cost, axial-flow cyclone was proved to be a better solution as a pre-filter.

A Possible Test Method Proposed for Resilient Modulus (MR) and Analysis of Correlation between Resilient Modulus and Shear Modulus of Track Subgrade Soil (흙노반재료의 회복탄성계수(MR) 결정을 위한 반복삼축압축시험법 제시 및 변형계수 상관성 분석)

  • Park, Jae Beom;Choi, Chan Yong;Lim, Sang Jin;Lim, Yu Jin
    • Journal of the Korean Society for Railway
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    • v.20 no.1
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    • pp.85-98
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    • 2017
  • In general, under the repetitive dynamic load generated by rail cars running on the track, subgrade soil experiences changes of stress conditions such as deviatoric stress (${\sigma}_d$) and bulk stress (${\theta}$). Due to the repetitive change of deviatoric stress (${\sigma}_d$) with number of loadings, the resilient modulus ($M_R$) can be obtained by using the measured resilient strain (${\varepsilon}_r$) after a sufficient number of loadings. At present, no plausible and unified test method has been proposed to obtain the resilient modulus of railway track subgrade soil. In this study, a possible test method for obtaining the resilient modulus ($M_R$) of railway track subgrade soil is proposed; this test, by utilizing repetitive triaxial compression testing, can consider all the important parameters, such as the confining stress, deviatoric stress, and number of loadings. By adapting and using the proposed test method to obtain $M_R$, $M_R$ values for compacted track subgrade soil can be successfully determined using soil obtained in three field sites of railway track construction with changing water content range from OMC. In addition, shear modulus (G) ~ shear strain (${\gamma}$) relation data were also obtained using a mid-size RC test. A correlation analysis was performed using the obtained G and $M_R$ values while considering the strain levels and modes of strain direction.

A Study of Analysis of Fault Data in AC Electrical Railway Power System Based on COMTRADE Using PSCAD/EMTDC (PSCAD/EMTDC를 활용한 COMTRADE 기반의 교류철도 급전계통 사고 데이터 분석에 관한 연구)

  • Lee, Ji-Hye;Min, Myung-Hwan;An, Tae-Pung;Lee, Byeong-Gon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.11
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    • pp.1542-1548
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    • 2018
  • When any faults occurred in electrical railway system, operators need to analysis it quickly and accurately. Existing COMTRADE based analysis tools are not enough to analysis faults occurred in electrical railway system. In this paper, it presents some functions to fault analysis for electrical railway system based on fault data formatted COMTRADE. These functions are implemented in PSCAD/EMTDC and it can be shown that analyzed results against actual electrical fault cases which were occurred in the electrical railway power system.