• Title/Summary/Keyword: Express train

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Development of Crack Examination Algorithm Using the Linearly Integrated Hall Sensor Array (선형 홀 센서 배열을 사용한 결함 검사 알고리즘 개발)

  • Kim, Jae-Jun;Kim, Byoung-Soo;Lee, Jin-Yi;Lee, Soon-Geul
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.11
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    • pp.30-36
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    • 2010
  • Previous researches show that linearly integrated Hall sensor arrays (LIHaS) can detect cracks in the steel structure fast and effectively This paper proposes an algorithm that estimates the size and shape of cracks for the developed LIHaS. In most nondestructive testing (NDT), just crack existence and location are obtained by processing 1-dimensional data from the sensor that scans the object with relative speed in single direction. The proposed method is composed with two steps. The first step is constructing 2-dimensionally mapped data space by combining the converted position data from the time-based scan data with the position information of sensor arrays those are placed in the vertical direction to the scan direction. The second step is applying designed Laplacian filter and smoothing filter to estimate the size and shape of cracks. The experimental results of express train wheels show that the proposed algorithm is not only more reliable and accurate to detecting cracks but also effective to estimate the size and shape of cracks.

A Union Model of Human and Agent for Processing the Information of the Complex System (복잡계 정보 처리를 위한 사람과 에이전트의 결합 모델)

  • 고성범;김동근
    • Journal of KIISE:Software and Applications
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    • v.30 no.7_8
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    • pp.752-763
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    • 2003
  • In the large scale B2B transaction like buying ´Express-Train´ or selling ´Daewoo Motor`, a tremendous amount of variables and factors of chaos functionate in it directly or indirectly. To get the effective information processing on the so called complex system like this, it should be possible to unite the human´s ability on the implicit information processing and the agent´s ability on the explicit information processing. In this paper, we suggested a union model for uniting these two heterogeneous abilities and showed how the suggested model can be used for processing the information of such a complex system as B2B negotiation.

A Study on the Development of Station Areas and Ex-railway Real Estate in Accordance with Regional Characteristics (지역특성에 따른 철도부동산 개발유형 연구)

  • Park, Heung-Soon
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.2319-2344
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    • 2010
  • Accumulated deficits resulting from managing the Korean Railroad and debts from the construction of the KTX (Korea Train Express which is a high-speed rail system) have left the Korean Railroad faced with great troubles. Since it changed into a public corporation Korail on January 1st, 2005, the Korea Railroad has been making unceasing efforts to overcome the troubles and improve its management. However, even these efforts haven't worked in the face of the improved conditions of other transportation methods such as better networks of land roads and air ways. The Korea Railroad had its revenue from its railway transportation limited, and has tried to expand its business to non-transportational areas. In some metropolitan cities, the Korea Railroad made investments in real estate by constructing station buildings based on private money. Yet, in small and medium size cities, the Korea Railroad has little particular strategic projects for business development. Recently certain small and medium size regional cities began to plan on business developments for the ex-railway land, and some small towns have developed real estate on the ex-railway land. Nevertheless, there have been no systematic case studies to classify these real estate developments.

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The Service Evaluation of Connection and Transfer Facilities in the High-speed Railway Stations (고속철도역의 연계환승시설 서비스 수준 평가)

  • Han, Sung-Yoeb;Kim, Kang-Seob;Park, Min-Kyu;Kim, Si-Gon
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.761-772
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    • 2009
  • The introduction of KTX (Korea Train eXpress) provided passengers with a much faster mode of transport, and KTX has become a model railway system. Express railway stations are emphasized as public transit transfer centers, but their service evaluations were not performed appropriately so far. It is possible to know the level of service by developing valuation criteria for their evaluations. The evaluation of transfer centers mainly consists of two parts; connective service with other travel m odes, and transfer service inside transfer stations. Connection is defined as the inter-connection of multi-transportation vehicles, and transfer means that a passenger changes his travel mode to another. Such connective service and transfer service are evaluated by the level of service in terms of transfer facilities, the appropriateness of station layout and the quality of information throughout the facilities. We developed the service evaluation indicators of connective facilities and referred to the indicators of transfer facilities. We examined the 7 stations in Korea that are currently in operation and standardized the methodology of the evaluation process by applying the indicators suggested in this study.

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Parametric Analysis in Dynamic Characteristics of Railway Track due to Travelling Vehicle (주행차량에 의한 궤도 동적?성의 매개변수 분석)

  • Kim Sang-Hyo;Lee Yong-Seon;Cho Kwang-Il
    • Proceedings of the KSR Conference
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    • 2003.05a
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    • pp.337-342
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    • 2003
  • The dynamic load effects are conveyed to the railway bridges through tracks which are generated by moving trains The dynamic load effects may vary due to the dynamic characteristics of the applied vehicle loads and the railway bridges containing the track system. However, the track effects have been neglected or simplified by spring elements in the most studies since it is quite complex to consider the track systems in the dynamic analysis models of railway bridges. In this study, track system on railway bridges is modeled using a three-dimensional discrete-support model that can simulate the load carrying behavior of tracks. In addition, this program is developed with the precise 20-car model and a continuous PSC(prestressed concrete) box girder bridge, which is the main bridge type of Korea Train express(KTX). Three-dimensional elements are used for both. The dynamic response of railway bridges is found to be affected depending on whether the track model is considered or not. The influencing rate depends on the traveling speed and different wheel-axle distance. The dynamic bridge response is decreased remarkably by the track systems around the resonant frequency. Therefore, the resonance effect can be reduced by modifying the track properties in the railway bridge.

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A study on Stage-Based Flow Graph Model for Expressing Cyber Attack Train Scenarios (사이버 공격 훈련 시나리오 표현을 위한 Stage 기반 플로우 그래프 모델 연구)

  • Kim, Moon-Sun;Lee, Man-Hee
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.31 no.5
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    • pp.1021-1030
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    • 2021
  • This paper proposes S-CAFG(Stage-based Cyber Attack Flow Graph), a model for effectively describing training scenarios that simulate modern complex cyber attacks. On top of existing graph and tree models, we add a stage node to model more complex scenarios. In order to evaluate the proposed model, we create a complicated scenario and compare how the previous models and S-CAFG express the scenario. As a result, we confirm that S-CAFG can effectively describe various attack scenarios such as simultaneous attacks, additional attacks, and bypass path selection.

A Study on $CO_2$ and PM10 Changes by Operation of KTX HVAC-Pressurization Equipment in Tunnel Sections (터널구간 운행시 KTX HVAC-여압장치 작동에 따른 $CO_2$와 PM10 변화연구)

  • So, Jin-Sub;Yoo, Seong-Yeon
    • Journal of the Korean Society for Railway
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    • v.10 no.6
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    • pp.723-729
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    • 2007
  • The Ministry of Environment established a guide line in December 2006, "Indoor Air Quality Management guidelines in Public Facilities." As the items of the guideline, $CO_2$ (Carbon dioxide) and PM10 (particulate matter) is shown to Level 1 and 2. Therefore trains and subways are included. There are a lot of tunnels by the lay of mountains on KTX (Korean Train Express) service. HVAC (Heating Ventilating and Air-conditioning)-pressurization equipment on KTX is various functioning flaps blocking outside pressure waves. At that time, the fresh air is blocked by flap operation and the air is circulated by return air. In this study, we measured the time series of $CO_2$ and PM10 concentrations in the KTX passenger cabin during the train service of Gyongbu line (Seoul-Busan) and Honan line (Yongsan-Mokpo) from July 2006. Also, analyzed the air quality by operation of KTX HVAC-pressurization equipment in tunnel passing point. As a result, PM10 concentration was totally lower than the regulation values. However, $CO_2$ was highly correlated with several tunnels, such as Oksan-Otan, Godeung-Hyudae and Gaechak-Iijik tunnel. but, the indoor air quality of KTX train have been proved satisfy the recommendation the Ministry of Environment guidelines.

A Multi-speaker Speech Synthesis System Using X-vector (x-vector를 이용한 다화자 음성합성 시스템)

  • Jo, Min Su;Kwon, Chul Hong
    • The Journal of the Convergence on Culture Technology
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    • v.7 no.4
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    • pp.675-681
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    • 2021
  • With the recent growth of the AI speaker market, the demand for speech synthesis technology that enables natural conversation with users is increasing. Therefore, there is a need for a multi-speaker speech synthesis system that can generate voices of various tones. In order to synthesize natural speech, it is required to train with a large-capacity. high-quality speech DB. However, it is very difficult in terms of recording time and cost to collect a high-quality, large-capacity speech database uttered by many speakers. Therefore, it is necessary to train the speech synthesis system using the speech DB of a very large number of speakers with a small amount of training data for each speaker, and a technique for naturally expressing the tone and rhyme of multiple speakers is required. In this paper, we propose a technology for constructing a speaker encoder by applying the deep learning-based x-vector technique used in speaker recognition technology, and synthesizing a new speaker's tone with a small amount of data through the speaker encoder. In the multi-speaker speech synthesis system, the module for synthesizing mel-spectrogram from input text is composed of Tacotron2, and the vocoder generating synthesized speech consists of WaveNet with mixture of logistic distributions applied. The x-vector extracted from the trained speaker embedding neural networks is added to Tacotron2 as an input to express the desired speaker's tone.

Comparison of Health Habits, Stress and Alexithymia (고등학생의 소화기계 증상에 따른 건강습관과 스트레스 및 감정표현불능증 비교)

  • Jung, Eun-Sook;Shim, Moon-Sook
    • Journal of Digital Convergence
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    • v.10 no.8
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    • pp.249-256
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    • 2012
  • This study explored the relation of health habit, stress and alexithymia in high school students. The subjects were 1,201 high school students. Collected data was analyzed by using the SPSS 17.0 program for descriptive statistics, ${\chi}^2$ -test, unpaired t-test. In results, exercise were significantly different according to health habit between the gastrointestinal symptoms and had no gastrointestinal symptoms. For the relation among the health habit, stress and alexithymia between the gastrointestinal symptoms and had no gastrointestinal symptoms were significantly different on stress and alexithymia. Therefore, the high schools should evaluate the students'health habit and stress due to the gastrointestinal symptoms. Schools should develop the health promotion program and operate it. And also train the students about communication method to help them recognizing their own feeling and express it, and also give them opportunity.

Forward Vehicle Tracking Based on Weighted Multiple Instance Learning Equipped with Particle Filter (파티클 필터를 장착한 가중된 다중 인스턴스학습을 이용한 전방차량 추적)

  • Park, Keunho;Lee, Joonwhoan
    • Journal of the Korean Institute of Intelligent Systems
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    • v.25 no.4
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    • pp.377-385
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    • 2015
  • This paper proposes a novel forward vehicle tracking algorithm based on the WMIL(Weighted Multiple Instance Learning) equipped with a particle filter. In the proposed algorithm Haar-like features are used to train a vehicle object detector to be tracked and the location of the object are obtained from the recognition result. In order to combine both the WMIL to construct the vehicle detector and the particle filter, the proposed algorithm updates the object location by executing the propagation, observation, estimation, and selection processes involved in particle filter instead of finding the credence map in the search area for every frame. The proposed algorithm inevitably increases the computation time because of the particle filter, but the tracking accuracy was highly improved compared to Ababoost, MIL(Multiple Instance Learning) and MIL-based ones so that the position error was 4.5 pixels in average for the videos of national high-way, express high-way, tunnel and urban paved road scene.