• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.256-259
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• 2016

The growth of mobile devices in Internet of Things (IoT) leads to a number of intelligent buildings related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The home server receives the command, then controls for instance the light system. The gateway based RESTful technology responsible for handling clients' requests attests an internet latency in case a large number of clients' requests submit toward the gateway increases. In this paper, we propose the design tasks of the IoT gateway for handling concurrency events. In the procedure of designing tasks, concurrency is best understood by employing multiple levels of abstraction. The way that is eminently to accomplish concurrency is to build an object-oriented environment with support for messages passing between concurrent objects. We also investigate the performance of event-driven architecture for building IoT gateway using node.js on one side and communication protocol based message-oriented middleware known as XMPP to handle communications of intelligent building control devices connected to the gateway through a centralized hub. The Node.JS is 40% faster than the traditional web server side features thread-based approach. The use of Node.js server-side handles a large number of clients' requests, then therefore, reduces delay in performing predefined actions automatically in intelligent building IoT environment.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.02a
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• pp.529-538
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• 2002

콤바인 곡물 포대 자동화장치개발은 콤바인 운전자 및 작업자의 피로경감과 안전보호 및 작업성능의 향상을 기하기 위하여 행하여 졌으며, 본 연구의 개발은 기존의 콤바인 작업이 2명이 소요되는 것을 운전자 1명이 수확작업을 할 수 있도록 하며, 노동력의 절감과 작업의 편리성을 도모하고자 하였다. 이러한 본 연구의 결과는 다음과 같다. 1) 곡물 포대의 정 위치화를 위해서 용량형 근접위치센서를 설치하였으며, 포대의 과다이송에 따른 모터의 부하를 최소화 하기위해 선단부와 슈트부에 각각 위치센서를 설치하여 포대의 위치를 제어하였다. 2) 곡물 투입장치부의 작동은 공기압축기와 공압실린더를 이용한 공압시스템을 사용하였으며, 곡물의 투입량제어는 슈트부 게이트의 열림시간을 제어하여, 곡물의 투입량을 제어하였다. 3) 포대 배출장치는 이송장치로부터 이송되어진 충진된 포대를 제 2의 포대가 충진하는 영역 밖으로 밸트 컨베이어를 이용 이송하도록 하였다. 4) 포대는 B3 포대의 경우가 가장 투입량이 많은 것으로 나타났으며, 가진을 한 경우가 하지 않은 경우보다 비교적 투입량이 많은 것으로 나타났다. 본 연구에서 개발된 포대 자동화장치에서는 포대의 가진 장치를 장착하지 않았으며, 실험은 인위적으로 가진을 하여 실행하였으며, 향후 전체적인 장치의 성능 향상을 위해서 포대의 가진 장치가 필요한 것으로 나타났다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.2 s.314
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• pp.47-59
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• 2007

Recently, Healthcare system has not been standardized and has been developed as an embedded system lacking interoperability. We are finally going to face such problems as having excessive load in using network caused by the uncontrolled spread of system and un-guaranteed interoperability among the heterogeneous systems. We suggest the possibility that OSGi and JADE can be accepted as a solution for the above problems.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1225-1228
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• 2017

본 연구의 목적은 자동화된 트레이닝 시스템을 통하여 드론 운용능력을 향상시키는 것에 목표를 두고 있다. 체계적인 드론운용능력을 갖추기 위한 코스를 설계하였으며, 코스를 구성하여 종합적인 평가를 내리기 위해서 4가지의 장치로 구성하였다. 각각의 장치의 명칭은 이착륙장, 게이트, 그라운드 시스템, 드론이며 해당 장치들을 통해 드론 운용 능력을 체계적으로 평가할 수 있다.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.2
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• pp.115-122
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• 2014

Injection pressure is one of factors that influence part quality. In this paper, injection pressure was minimized by optimizing valve gate locations. In order to perform design optimization, MAPS-3DTM (Mold Analysis and Plastic Solution-3D) was used for injection mold analysis and PIAnOTM (Process Integration, Automation and Optimization) was used as process integration and design optimization. Also we adapted meta models based on design of experiments for efficiency. By using introduced methodology, we were able to obtain a result so that maximum injection pressure reduced by 28% compared to the initial design. And the validity of the proposed method could also be demonstrated.

• Journal of IKEEE
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• v.18 no.1
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• pp.140-145
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• 2014

OPC UA(IEC62541) is a communication protocol for SG(Smart Grid) application platform. It was standardized by IEC TC57 group in December 2012. The IEC61850 has been used in Digital Substation Systems and Smart Distributed Systems. The DNP3.0 has been used for device's data collection/control in Distributed Systems. The DLMS/COSEM has been used to control metering and collect information in the Smart Metering. The top-level SG management platform needs an independent middleware to manage transparently the Power Information Technology, including the IEC61850, DNP3.0, DLMS/COSEM. In this paper, we propose the SDG(Scada Data Gateway) platform. It manages Power Information Technology based Digital Substation Systems and Smart Distributed systems, Smart Metering through OPC UA.

• Journal of the Korean Society for information Management
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• v.27 no.1
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• pp.137-163
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• 2010

Library course pages are an integrated service providing both course management information and library resources as one gateway to strengthen university libraries' information services. It is possible to associate course management system and library resources, and to provide course-specific information rather than library interface with various searching gateways. In the case of foreign university libraries, library course pages have been developed more effectively and variously for university's environment and characteristics, and have been built for all the courses in a university by system processing, not manually. In foreign libraries, there are many sophisticated, dynamic, database-driven house-developed and vendor-developed systems for library course pages than hand coded HTML pages. But in Korea, there is a lack of awareness of the importance of library course pages among librarians, and the programs of library course pages have not yet been developed. Therefore, this study is to build the model for library course pages using literature reviews and case studies. Then, this study could also lay the foundation for effective library services and the system development of library course pages.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.11
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• pp.57-65
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• 2014

This paper presents a framework that is based on a reconfigurable macro-model of current-mode logic (CML) high-speed digital circuits enabling equation-based design optimization. The proposed macro-model is compatible with geometric programming, thereby enabling constraint-driven top-level power optimization. The proposed optimization framework is applied to a design of CML based serial-link transmitter with user-defined design specifications as an example of high speed digital circuits using 45nm and 90nm CMOS technology. The proposed optimization framework can derive a design with optimal power efficiency for given transistor technology nodes.

• Korea Logistics Conference
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• v.10 no.1
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• pp.5-24
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• 2002

전자상거래의 발달은 산업구조와 상거래의 변화를 가져왔다. 기존의 제조업체와 도, 소매상과 소비자와의 관계 변화에 따라 물류에 대한 중요도가 더해 가고 있다. 인터넷상에서 실시간으로 이루어지는 전자상거래에서 물류는 그 성패를 가늠할 만큼 중요한 요소라 할 수 있다. 국내에서는 변화하는 정보화시대에 대비하여 정부차원에서 지난 90년대 중반부터 물류분야에서 종합물류정보망을 구축하여 수출입물류와 국내물류의 정보화를 추진하고 있다. 통관망과 더불어 종합물류정보망은 수출입물류에 있어 전자문서교환(EDI)과 컨테이너터미널에서의 게이트자동화와 터미널운영정보서비스를 제공하고 있다. 육상에서는 첨단화물운송정보시스템(CVO)을 구축하여 화물차량실시간추적 및 수배송주선서비스를 제공하고 육상과 수출입물류에서 정보관리와 통계서비스를 제공하고 있다. 전자상거래에 따른 산업구조와 기술개발 등의 변화 외에도 남북한 긴장완화, 동북아시아 환경변화, 환경친화형 사회 구축 등에 따른 물류정보화에 대한 접근이 필요하게 되었다. 이에 따라 외국에서의 전자상거래의 발달에 따른 물류정보화의 추세, 통신 및 정보기술(IT)의 발달에 따라 구현가능한 물류정보화 서비스를 살펴보고 국내에서 추진중인 종합물류정보망의 서비스와 시스템의 추진방향에 대해 다루어 보았다. 종합물류정보망에서는 향후 수출입물류정보서비스, 첨단화물운송(CVO) 서비스, 통합물류DB서비스, 물류거점시설정보서비스, 물류 e-Marketplace 서비스를 구축, 제공할 예정이다.

• Journal of Korean Port Research
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• v.12 no.2
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• pp.225-232
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• 1998

Todays, the efficient management of container has not been realized in container terminal, because of the excessive quantity of container transported and manual system. For the efficient and automated management of container in terminal, the automated container identifier recognition system in terminal is a significant problem. However, the identifier recognition rate is decreased owing to the difficulty of image preprocessing caused the refraction of container surface, the change of weather and the damaged identifier characters. Therefore, this paper proposes more accurate system for container identifier recognition as suggestion of LSPRD(Line-Scan Proper Region Detection) for stronger preprocessing against external noisy element and MBP(Momentum Back-Propagation) neural network to recognize the identifier.