• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.582-589
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• 2009

The energy generated by braking vehicle would simply be converted into waste heat by its braking resistors if no other vehicle is accelerating at exactly the same time. Up to 45% of the tractive power of vehicles capable of returning energy to the power supply can be regenerated during braking and that this energy can be used to feed vehicles which are accelerating at the same time. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system, here after) stores the energy generated during braking and discharges it again when a vehicle accelerates. The ESS is able to store and discharge energy extremely quickly, consequently enabling a complete exchange of energy between vehicles, even if they are not braking and accelerating at precisely the same time, as is most frequently the case in everyday service. The energy saving rate is related to the headway. If the headway is long/short, the energy saving goes up/down, When the headway is short, the ESS can not save much regenerative energy. The headway of SeoulMetro line 2 as the worst case is very short in Korea urban transit system. So, the energy saving rate will be very low. If the ESSs are applied to another railway system, we can expect that the effectiveness is better than the results of SeoulMetro line 2. This paper presents effects of energy saving obtained by applying the ESS to SeoulMetro line 2.

• 전기의세계
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• v.43 no.6
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• pp.35-42
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• 1994

여기서는 주로 신호제어의 면에서 본 열차제어시스템의 기술적 요건과 과제를 개관하고, 구체적인 사례로서 고속열차의 운전제어, 수송력 증강을 위한 운전시격 단축, 무인운전 등 주로 열차속도 제어와 관련한 시스템에 촛점을 맞추어 최근 동향을 소개한다. 특히 경부고속철도에 적용될 프랑스의 TGV의 열차 제어시스템에 관하여 소개하고, 첨단의 컴퓨터 및 통신기술을 도입하여 열차제어 및 운영의 효율화, 다양화를 추구하고 있는 최신 열차제어시스템의 발전 방향을 알아보기로 한다.

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.917-917
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• 2006

• 중국학논총
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• no.68
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• pp.95-114
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• 2020

《詩人玉屑》是南宋後期魏慶之所撰, 被評爲宋代三大詩話叢集之一. 此書收錄兩宋文人對詩格, 詩法的重要理論和見解. 尤其是宋代詩學的重要內容詩眼論, 《詩人玉屑》收錄很豐富的言論, 具有考察價值. 所謂詩眼指一首詩的眼目, 一句或一篇之內最精煉的字, 也是全詩主旨所在. 這概念從魏晉南北朝繪畫理論和禪宗理論發展來, 後來進入到宋代詩學領域. 詩眼的前提爲造語的創意性, 爲此需務去陳言而尋找新語. 宋人吸取經典語, 俗語, 方言, 禪語等, 以此爲創作的語言因子. 運用實字虛字是詩眼論的重要內容. 宋人認爲作詩眼時, 實字重於虛字, 動詞貴於名詞. 就位置而言, 宋人有"五字詩以第三字爲眼, 七字詩以第五字爲眼也"的共識, 同時强調活字, 響字, 拗字的活用. 但這不是要死守的固定原則, 而是相同於活法概念, 可以靈活運用.

• Journal of the Korea Society for Simulation
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• v.6 no.2
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• pp.59-69
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• 1997

This paper proposes a simulation method of train control system to increase railroad transportation capacity in the Seoul Subway. Comparing with the conventional fixed block system, a new train operation method of "moving block system" shows a more capability of same railroad. A graphic simulation program is developed for application of moving block system to Seoul subway train control system. The result of the simulation program shows a shorten headway i.e. a more dense operation of trains and a higher efficiency of railroad with the suggested moving block system.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.308-315
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• 2000

Headway calculation is a important mean to evaluate railway system performance. A accurate headway calculation can be needed to headway reducing being achieved line capacity increasing by regulating signals spacing without any line construction. This paper introduced the theories and algorithms of calculating headways on wayside, multi step, one step braking and moving block signalling systems and showed some results of headways.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1495-1500
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• 2006

A signal system is critical point of transport capacity and train operation in urban rail transit. Today the moving block system by radio is taking place of the fixed block system by track circuit for efficiency and short headway in underground railway and right rail transit. In this study, assuming specification of a train, track and control system, the minimum headway on the moving block system and the fixed block system is researched for the maximum transport capacity.

• Journal of the Korean Society for Railway
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• v.15 no.1
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• pp.37-41
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• 2012

Kyung-Bu High Speed Railway is operated in train control system(tcs) of fixed block operated in a way of dividing track circuits into several blocks in accordance with operation circumstances such as rolling stocks, grade, curves and facilities. The TCS of fixed block system refers to a continuous train control system, which transfers operational information such as entry and exit speed, distance-to-go, and deceleration etc. into on-board train control equipment on the basis of block occupancy of a preceding train. It guarantees a safe operation of trains by giving an emergency braking order, in case that a train exceeds an entry and exit speed of a corresponding block. In this paper, we analyze the speed control code deducing in accordance with maximum operation speed and characteristics of rolling stocks by analyzing principles of generation of speed control code allocated in blocks for safe operation, then train operational efficiency was analyzed by means of analysis of operation headway in accordance with the deduced speed control code. This study will be used to design in case of getting an increase in speed for existing high speed line or new high speed line TCS.

• Journal of the Korean Society for Railway
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• v.19 no.4
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• pp.555-563
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• 2016

Line capacity of railways is a core criterion to decide maximum trips in accordance with traffic demand and a priority in railway investment to improve transportation capability. Particularly, because two operators will start revenue services in the HSR from mid-2016, the line capacity should be carefully calculated and controlled to avoid conflicts between the maximum number of KTXs, and the number needed to guarantee the effective competition of the operators. Meanwhile, there have been many arguments about calculating the line capacity, because this number is affected by the number of trips by train types, stopping pattern and dwell time in each station, journey time, crossing or passing, safety headway between trains, etc. To deal successfully with these kinds of problems, this study proposes a simulation method to calculate the line capacity that considers train operation according to the operator's service policies.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.687-694
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• 2008

Given the daily tactical schedule, the purpose of the traffic management system is to develop operating plan that will achieve the stated schedule as best as possible. The operating plan has to be modified during the day because of occurring disturbance(e.g. delay, infrastructure breakdown, etc.) Conflict detection and resolution(CDRS) are aimed for adjusting the distorted schedule to tactical schedule. Our research separate CDRS into two hierarchy modules, line conflict control module and station conflict control module. We define the role of each modules and design the cooperative architecture. We suggest the conflict detection and resolution approach based on mathematical model. These results can be implemented as prototype modules.