• Title, Summary, Keyword: Multiple Units

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The flexible network implementation of TMDS in case of multiple unit and variable train-set (중련 및 가변편성에서의 TMDS의 유연한 network 적용)

  • Shin, Kwang-Kyun;Han, Jeong-Su;Kim, Chul-Ho
    • Proceedings of the KSR Conference
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    • pp.141-147
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    • 2009
  • This paper reports on a study to increase the flexibility of previous TMDS(Train Monitoring and Diagnosis System) network communication in case of both multiple units and variable train sets. The previous TMDS network configuration has been applied using various field-BUS by the TMDS manufacturers using their own intrinsic method. But recently, there has been a demand for flexible train formations such as multiple units and variable train set formations, hence the TMDS had to be adapted to offer flexible network communication technology capability. Therefore, Hyundai-Rotem needed its intrinsic method of network configuration, and develop a network configuration method applicable to both multiple units and variable train set formations. The TMDS was integrated into the Irish Rail new Diesel Multiple Units from an early stage of the project and subsequently fully tested on a finished train.

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Study on Communication Interface of Multiple Smartphones for Unit Control in a PC (PC에서 유닛 제어를 위한 다중 스마트폰의 통신 인터페이스 연구)

  • Jung, Hahmin;Kim, Dong Hun
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.6
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    • pp.520-526
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    • 2013
  • This study presents the unit control of a PC (Personal Computer) program using multiple smartphones based on ad hoc communication. A design of the data packet that multiple smartphones send to a computer, and a framework that manages and controls the unit in a computer after analyzing the data packet, are proposed. As a result, multiple users are able to control their own units using their smartphones while seeing the monitor connected to a computer. In other words, multiple users can share the same game in a computer or control their units embedded in a system using their smartphones. An experimental result shows that a racing game in a PC can be realized by the proposed communication interface, where four iPhones are used to control their units in a computer. Thus, the proposed framework can be effectively used for unit control in a PC using multiple smartphones.

Power System and Drive-Train for Omni-Directional Autonomous Mobile Robots with Multiple Energy Storage Units

  • Ghaderi, Ahmad;Nassiraei, Amir A.F;Sanada, Atsushi;Ishii, Kazuo;Godler, Ivan
    • Journal of Power Electronics
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    • v.8 no.4
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    • pp.291-300
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    • 2008
  • In this paper power system and drive-train for omni-directional autonomous mobile robots with multiple energy storage units are presented. Because in proposed system, which is implemented in soccer robots, the ability of power flow control from of multiple separated energy storage units and speed control for each motor are combined, these robots can be derived by more than one power source. This capability, allow robot to diversify its energy source by employing hybrid power sources. In this research Lithium ion polymer batteries have been used for main and auxiliary energy storage units because of their high power and energy densities. And to protect them against deep discharge, over current and short circuit, a protection circuit was designed. The other parts of our robot power system are DC-DC converters and kicker circuit. The simulation and experimental results show proposed scheme and extracted equations are valid and energy management and speed control can be achieved properly using this method. The filed experiments show robot mobility functions to perform the requested motion is enough and it has a high maneuverability in the field.

Study on Promotion of the Maintenance Engineers for Multiple Dwellings (공동주택의 유지관리전문인력 육성에 관한 연구)

  • Park, Sang Hoon
    • KIEAE Journal
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    • v.10 no.4
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    • pp.29-37
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    • 2010
  • The industrialized countries have promoted the rehabilitation of existing housing units as a national agenda, such as green policies, whereas korea, although having a housing stock as huge as that of world countries, have focused on the growth of housing by constructing new units rather than rehabilitating existing ones. Today, it has been so long since many multiple dwellings in Seoul and in the vicinity of Seoul were constructed. There were, however, very few political efforts to encourage the rehabilitation of housing. Today, substantial time has passed since multiple dwellings in Seoul and the first-stage new cities such as Bundang and Ilsan were constructed. What is required to maintain the quality of the existing housing and use it with safety is to promote the engineer of maintenance for multiple dwellings to work the maintenance of existing multiple dwellings. The objective of this study is to compare and analyze the maintenance qualification system of multiple dwellings of Japan, and then to propose to raise engineers of maintenance for multiple dwellings in korea.

Stochastic Reliability Analysis of Armor Units of Rubble-Mound Breakwaters Subject to Multiple Loads (다중하중에 따른 경사제 피복재의 추계학적 신뢰성 해석)

  • Lee, Cheol-Eung
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.24 no.2
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    • pp.138-148
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    • 2012
  • A stochastic reliability analysis model has been developed for evaluating the time-dependent stability performance of armor units of rubble-mound breakwaters subjected to the multiple loads of arbitrary magnitudes which could be occurred randomly. The initial structural capacities and the damage rates of armor units of rubble-mound breakwaters could be estimated as a function of the incident wave height with a given return period by using the modified Hudson's formula and Melby's formula. The structural stability performances of armor units of rubble-mound breakwaters could be analyzed in detail through the lifetime reliability investigations according to the limit states such as the serviceability or ultimate limit state and the conditions of multiple loads. Finally, repair intervals for the structural management of armor units of rubble-mound breakwaters could quantitatively be evaluated by a new approach suggested in this paper that has been based on the target probability for repair and the accumulated probabilities of failure obtained from the present stochastic reliability analysis model.

Design of a Distributed Enactment Model for Business Process Management (비즈니스 프로세스 관리를 위한 분산 실행 모형 설계)

  • Hur, Wonchang
    • Journal of Korean Institute of Industrial Engineers
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    • v.32 no.3
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    • pp.191-199
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    • 2006
  • Effective management of business processes is a crucial issue to every enterprise in e-business environment. What's needed is a new framework of applications that can automatically manage distributed and heterogeneous business processes that span multiple functions of a company. In this paper, we propose technical design of a new enactment model that can coordinate such business process that involves multiple functional units or even multiple companies. In our approach, a process model is decomposed into several structural units, called 'process block', according to their procedural characteristics. Each of them is controlled by autonomous enactment units that can communicate with each other using a mutually agreed coordination protocol. The protocol takes the use of 'associative communication' concept, which allows the autonomy for each unit and secure the correctness of process execution.

On Study the Safety Assessment of Accident Electric Multiple Units (전동차 구조체의 안전성 평가 연구)

  • 정종덕;김정국;편장식;김원경;홍용기
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1105-1108
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    • 2004
  • This paper describes the structural analysis result and load test result of accident EMU(Electric Multiple Units). Structural analysis and load test of EMU were performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The purpose of the load test is to evaluate a safety which carbody structure shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load and operating condition. The results have been used to provide the critical information for the criteria of safety assessment.

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On Study the Safety Diagnosis of Carbody Structure for Crashed Electric Multiple Units (사고전동차 구조체의 안전진단에 관한 고찰)

  • Bae Dae-Sung;Park Geun-Soo;Chung Jong-Duk
    • Journal of the Korean Society for Railway
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    • v.8 no.3
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    • pp.253-259
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    • 2005
  • This paper describes 3D Dimensional Measurement(EDM testing) and tensile testing results of carbody structure for crashed EMU(Electric Multiple Units). Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the crashed EMU. And Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The testing results have been used to provide the critical information for the criteria of safety diagnosis.

Sixth Grade Students' Understanding on Unit as a Foundation of Multiple Interpretations of Fractions (분수의 다양한 의미에서 단위에 대한 초등학교 6학년 학생들의 이해 실태 조사)

  • Lee, Ji-Young;Pang, JeongSuk
    • Journal of Educational Research in Mathematics
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    • v.24 no.1
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    • pp.83-102
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    • 2014
  • The purpose of this study was to explore students' understanding on units embedded in multiple interpretations of fractions: (a) part-whole relationships, (b) measures, (c) quotients, (d) ratios, and (e) operators. A total of 150 sixth graders in elementary schools were surveyed by a questionnaire comprised of 20 tasks in relation to multiple interpretations of fractions. As results, students' performance on units varied depending on the interpretations of fractions. Students had a tendency to regard the given whole as the unit, which led to incorrect answers. This study suggests that students should have rich experience to identify and operate various units in the context of multiple fractions.

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A Study on Inventory Control Method for an Item with Stockkeeping Units (재고보유단위로 관리되는 제품의 재고관리 방법에 관한 연구)

  • Yoon, Seung-Chul
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.38 no.1
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    • pp.124-130
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    • 2015
  • In many inventory situations, items for sales are generally stocked in a multiple of variations called stockkeeping units, such as size, color, style, and so on. For better management performance on sales items, proper and effective management is necessary for the stockkeeping units. In dealing with many items and those stockkeeping units, individual inventory analysis for each stockkeeping unit needs large amount of time or cost. Also the individual approach in inventory planning increases the demand variation of an item as the result by combining of demand variations of all stockkeeping units, accordingly the inventory turnover ratio and profitability are dropped down. This research suggests an effective method of systematic control of total stockkeeping units by generating from the total item basis, and shows how to reduce the safety stock and the average inventory with attaining a planned customer fill rate of the item and each stockkeeping units.