• Title/Summary/Keyword: FM시스템

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Improvement Direction of Facility Management System(FMS) through Related Systems Analysis (유관 시스템 분석을 통한 시설물정보관리종합시스템 개선방향)

  • Jung, In-Su
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.10
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    • pp.6751-6758
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    • 2015
  • The Special Act on Safety Control for Infrastructure was enacted in 1995 to contribute to ensuring the public safety and welfare improvement of Korean people. In addition, the FMS has been developed and operated to manage facilities effectively. However, several problems of the FMS have also occurred. Thus, this study aimed to analyze the FMS and related systems scrutinizingly to suggest improvement directions such as (1) extension of the FMS into the national facility information management system including small-size facilities other than Types 1 and 2 facilities, (2) development and promote standardized inspection and diagnosis systems as per facility type, (3) development of the database utilization system including decision making support function for management body, and (4) providing the FMS performance improvements and stable operating environment utilizing latest information technologies. If the improvement directions suggested in this study are adopted, they can improve services for Korean people by providing facility safety and maintenance work parties with optimum information services.

Implementation of RFID System Type C Using VHDL (VHDL을 이용한 REID 시스템 Type C의 구현)

  • Cho, Kyung-Chul
    • Journal of Digital Contents Society
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    • v.7 no.3
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    • pp.147-151
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    • 2006
  • In recent years, the Internation Standard ISO/IEC 18000-6 is announced and a new scheme of Type C is added to conventional standard. Among the RFID systems the ISO/IEC 18000-6 standard is the most interesting to companies due to its potential market growth. The operating frequency is between 860-960 MHz, and three kinds of RFID system are included in the standard, i.e. type A, B and C. In this paper, we implemented the data frame of type C with baseband coding using VHDL. The data frame is encoded based on Miller code and FM0. We showed the implementation results with waveforms. The data frame was proved that it is properly implemented by the experiment of transmission and receiving operation.

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Performance analysis of Coaxial Propeller for Multicopter Type PAV (Personal Air Vehicle) (멀티콥터형 PAV(Personal Air Vehicle)의 동축반전 프로펠러에 대한 성능해석)

  • Kim, Young Tae;Park, Chang Hwan;Kim, Hak Yoon
    • Journal of Aerospace System Engineering
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    • v.13 no.3
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    • pp.56-63
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    • 2019
  • Performance analyses were performed on a propeller developed for use in a PAV (Personal Air Vehicle) under 600 kg Maximum Take-Off Weight (MTOW). The actuator disc theory and CFD analyses were used to estimate the hovering time with regards to MTOW variation for a given battery weight. The interference induced power factor kint was introduced to account for the effect of flow interference between the propellers and to estimate the performance of counter-rotating propellers. The Maximum Figure of Merit (FM) value of the propeller pitch was determined and the design RPM range for the required power inversely obtained from the CFD results. Previous research indicate that the flight time of large multi-copter is limited by the available battery energy density. Similarly, the propeller pitch settings and spacing are important factors in reducing the kint value.

Traffic Information Service System Using Gateway between VANET and Infrastructure Network (VANET과 기간통신망간 게이트웨이를 사용한 교통정보 서비스 시스템)

  • Park, Mi-Ryong;Kim, Sang-Ha;Kim, Dongwon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.12 no.5
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    • pp.61-66
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    • 2012
  • We propose a traffic information service system for which traffic data are transmitted over vehicle ad-hoc network from neighbor vehicles, and eventually provided to the traffic information center through a few gateway vehicles which are capable of inter-working with the infrastructure network like 3G. The center broadcasts the traffic information through the FM radio. The proposed scheme allows collecting and analyzing traffic status of large areas without incorporating separated monitoring systems, e.g., probe cars and enables to provide accurate traffic information to drivers in timely manner. We also evaluate its performance by ns-3 simulation.

The Performance Comparison Of FSK, BPSK, DPSK In Underwater Communication Channel (수중통신채널에서 FSK, BPSK, DPSK의 성능비교)

  • 박지현;백승관;노용주;윤종락
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.05a
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    • pp.359-362
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    • 2001
  • Analog communication systems using AM, FM modem have been developed. Digital communication systems using digital modems, which is by expansion of digital hardware skill have been recently developed. In order to accomplish a reliable communication it is important to overcome ocean environmental channel characteristics such as transmission loss, ambient noise and multipath effect etc. Specially, the effect of multipath is the most important element that determines the performance of underwater communication system in shallow water. Multipath channel can be divided a vertical and horizontal channel. the former is defined the channel to have large path-delay times between a direct wave and reflected waves. The latter shows relatively small path-delay times between a direct and reflected waves in compared with a vertical channel. In this paper, The performance of FSK, PSK and DPSK modem with respect to the vertical and horizontal multipath communication channels it described and compared.

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Emergency Broadcast System Using Radio and DMB for Tunnel and Underground (라디오와 DMB 방송을 이용한 터널 및 지하차도용 비상방송시스템)

  • Do, Daewook;Lee, Choong Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2019.05a
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    • pp.392-394
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    • 2019
  • Tunnels and subterranean roads, which are representative evacuation facilities for national or regional disasters, have radio relay broadcasting facilities for legal reasons and convenience reasons. However, this system is limited to radio broadcasting and it is impossible to effectively communicate disaster or emergency situations that occur locally due to broadcasting of national broadcasting without DMB broadcasting. In order to improve this, we construct a remote disaster broadcasting system at each regional disaster station and implement a system to transmit it to each tunnel using internet or LTE network. The system in the tunnel transmits the emergency broadcasting signal through the existing relay equipment through the modulator which decodes the SMS, the media file, the real time broadcasting or the image received by the digital signal and converts it into FM and DMB frequency. The method proposed and implemented in this study can be used to provide efficient information and remote field control in case of emergency in tunnel and underground roadway.

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Effects of Part RElease Policies to Performance of Manufacturing Systems (부품투입정책이 시스템 성능에 미치는 영향에 관한 연구)

  • 우상복
    • Proceedings of the Korea Society for Simulation Conference
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    • 1994.10a
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    • pp.9-9
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    • 1994
  • FMS를 비롯한 대부분의 제조시스템의 운용을 위해서는 크게 전략적 의사결저오가 전술적 읫사결저이 필요하며, 이 중 전술적 의사결증은 부품 선택, 생산율 결정, 부하할당, 부품 투입, 일정계획 문제등과 관련되어 있다. 본 연구에서는 부품투입시점과 부품투입순서에 의해 결정된 부품투입 정책이 시스템 성능에 미치는 영향을 알아보기 위해서, 서울대학교부설 자동화시스템공동연구소(ASRI)내의 FMS/CIM Center를 대상으로 시뮬레이션을 수행하였다. ASRI-FMS /CIM Center 는 기계가공과 조립이 동시에 이루어지는 FMAS(Flexible Mauufacturing & Assembly System) 형태의 모형공장이며, 현재 세 종류의 모터 등을 생산할 수 있다. 본 연구에서는 고려한 부품투입시점 전략으로는 고정 WIP(Work-in-process)유지전략 , 병목기계 전략, 일정비율 투입전략 등이며, 부품 투입순서 전략으로는 크게 주기적 투입전략과 비주기적 투입전략을 고려하였다. 또한 이러한 부품 투입정책들이 시스템 내에서 적용할 수 있는 여러 가지 우선순위규칙 등과 함께 사용될 때, 나타나는 상호관계를 파악하기 위한 연구가 수행되었다. 아울러 병목기계 추가도입, 물류운반시간의 감소 등과 같이 가능한 범위에서 현재의 시스템 조건이 바뀐 상황에 대해서도 시뮬레이션을 수행함으로써, 추후 변경된 시스템에서도 본 연구의 결과가 적응될 수 있도록 하였다.

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The Switching Technique to the Alternative Frequency on RDS Broadcastment (RDS 방송에서 대체주파수로의 전환기법에 관한 연구)

  • Hwang, Jong-Hyun;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.11
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    • pp.2379-2384
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    • 2010
  • The reception quality of broadcasting in car radio system may become poor due to the noise such as week signal strength, multipath, Adjacent Channel and so on. To improve this, some european nations and US. serve RDS(Radio Data System) on FM radio, AF(Alternative Frequency) and PI(Programme Identification) code contained information in RDS data are used to switch to the broadcasting having the best reception quality. There are many techniques and studies of maintaining the best reception quality. But many previous techniques are no longer the best way because RF chips are improved every year and noise components can be distinguished in detail. So this research will suggest the best switching technique to maintain the best reception quality.

Establishing Automated Mapping/Facilities Management System Using PC-CAD (PC용 CAD를 이용한 단지기반시설 정보화)

  • 이규석;안승만;탁형렬
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.15 no.2
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    • pp.141-148
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    • 1997
  • Continuous development of Personal Computer(PC) combined with the decrease of price and the expansion of operating system in PC like Windows 95, and Windows N/T makes it possible for the user to consider PC-bas-ed Automated Happing/Facilities Management (AM/FM) system. Therefore, the purpose of this study is to establish a PC-based data automation system of pipe infrastructures-water, sewer, and drainage-and road in Korea Land Corporation. In order to achieve this goal, relevant literature survey was done first. Secondly, the study site was determined by discussion with Korea Land Institute. Thirdly, PC-based CAD software for AM/FM in the world market were surveyed, and AutoCAD Map was selected because KLC had been using hundreds of AutoCAD copies already. After that user needs assessment was done to visit on-site office, local branch office, and the corresponding city office for the system design and database design. After the graphic data were digitized and the attribute data were entered into the batabase, the data automation system was established, and tested for application. Finally, the guidelines and problems for PC-based data automation in AM/FM was discussed.

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A mechanism for Converting BPMN model into Feature model based on syntax (구조 기반 BPMN 모델의 Feature 모델로 변환 기법)

  • Song, Chee-Yang;Kim, Chul-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.733-744
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    • 2016
  • The legacy methods for converting a business model to a feature model make it difficult to support an automatic transformation due to a dependence on a domain analyzers' intuitions, which hinders the feature oriented development for the integration of feature modeling in business modeling. This paper proposes a method for converting a BPMN business model into a feature model based on syntax. To allow the conversion between the heterogeneous models from BPMN to the FM(Feature Model), it defines the grouping mechanism based activities' syntax, and then makes translation rules and a method based on the element (represent business function) and structure (relationships and process among elements), which are common constructs of their models. This method was applied to an online shopping mall system as a case study. With this mechanism, it will help develop a mechanical or automated structure transformation from the BPMN model to the FM.