• Journal of Biosystems Engineering
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• v.36 no.2
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• pp.122-129
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• 2011

This study was performed to develop a wireless system for measuring agricultural atmospheric factors using ubiquitous sensor network(USN). In the study, temperature, humidity and light intensity were selected and evaluated as major agricultural atmospheric factors. An USN system was designed and implemented by using Zigbex I and II (mote sensor nodes of MICA series) provided by Hanback Electronics, Korea. The system was tested in a greenhouse and an orchard. The experiment results showed that the suggested USN measuring system would be very effective on comprehensive measurement of the selected factors on the basis of time, day, spatial sequence with reasonable costs.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.745-748
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• 2005

These days, vehicle is evolving from the isolated space of transportation to the third digital life space connected to the information world via wired and wireless internet and in which the various activities are possible. According to this trend, the speed of growth in the development of Telematics technology and standard is being accelerated due to the government's IT839 strategy and market needs in Korea. ETRI, TTA, and the Telematics Standardization Forum play key role in developing domestic Telematics standard of core technology needed by industry in relation with each other. The international standards are mainly developed by de-facto standardization organizations such as OSGi, OMA, ERTICO, etc. currently. In this paper, we discuss the trends and issues in Telematics standardization and future strategy.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.608-611
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• 2005

The existing wired emergency call such as 119, 112 have its own location information to serving immediate rescue service. For the case of wireless emergency call by mobile phone, the location information should be provided by wireless network. This paper describes the network architecture and protocol for mobile emergency service referring TIAlEWJ-SID-036-A with reviews about technical issues, legacy factors and related researches. The mobile emergency service is divided into mobile emergency rescue service and mobile emergency alert service. The network reference model for mobile emergency rescue service is released in KOREA. In this paper, the interfaces between elements of the network reference model, and service scenarios, message flows are defined. Supplement to mobile emergency rescue service, the network reference model, interfaces and message flows for mobile emergency alert service are developed. The protocol is described by DID, and the proposed works are on processing for domestic standard of TTA.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.349-352
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• 2005

The telematics positioning testbed is an infrastructure to test and verify positioning technology, the sub-component of telernatics system. The positioning testbed provides the environment of performance analysis for acquisition of static and dynamic positioning information using telematics vehicle. This testbed consists of onboard positioning system, positioning reference station and lab positioning server. The onboard positioning system equipped in telematics vehicle, consists of target positioning system, reference positioning system, and analysis tool. A equipment acquiring high precision positioning data obtained from GPS combined with IMU was set as a reference positioning system. Analysis tool compares observed positioning data with high precision positioning information from a reference positioning system, and processes positioning information. Positioning reference station is RTK system used for reducing atmosphere error, and it transmits corrected information to reference positioning system. Positioning server which is located at laboratory manages positioning database and provides monitoring data to integrated testbed operating system. It is expected that the testbed supports commercialization of telernatics technology and services, integrated testing among component technology and verification.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.546-549
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• 2005

It is evident that advancement of ubiquitous technologies in the near future guarantees more convenient and plentiful living. With regarding to car life, we dream of an automatic driving without any effort of operation. This paper touches the realization issue, a convergence of wireless sensor network and Telematics specializing on an information routing mechanism between participating components in Telematics sensor communication network. We list up new requirements of wireless sensor network deployed for Telematics services. Then context-aware routing architecture is proposed in order to solve these constraints, in which a network topology for routing can be dynamically configured according to the combination of context models of network components.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.317-320
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• 2005

The LBS (Location-Based Services) are valuable information services combined the location of moving object with various contents such as map, POI (point of Interest), route and so on. The must general service of LBS is route determination service and its applicable parts are FMS (Fleet Management System), travel advisory system and mobile navigation system. The core function of route determination service is determination of optimal route from source to destination in various environments. The MODB (Moving Object Database) system, core part of LBS composition systems, is able to manage current or past location information of moving object and massive trajectory information stored in MODB is value-added data in CRM, ERP and data mining part. Also this past trajectory information can be helpful to determine optimal route. In this paper, we suggest methods to determine optimal route by querying past trajectory information in MODB system and verify the effectiveness of suggested method.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.255-258
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• 2009

본 논문은 USN시스템을 이용해서 실시간으로 병원의 각 병실에 대한 센서에서 측정된 정보를 관리자에게 실시간으로 모니터링 할 수 있도록 해주며 노드의 설정이나 프로그램 전송을 다른 프로그램을 사용하지 않고도 센서에 전송할 수 있게 한다. 또한 이 시스템에서는 단순한 모니터링뿐만 아니라 제어장비를 통해서 환경을 자동으로 제어할 수 있도록 하는 일체형 시스템 구축을 목표로 한다. 본 논문에서는 제안한 시스템과 기존의 병원 시스템과 비교해 보았다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.305-308
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• 2009

무선 센서 네트워크 환경에서는 수많은 노드들이 광범위한 영역에 걸쳐 이벤트 정보를 전송한다. 센서들이 이벤트 정보를 정확하고 빠르게 전송하기 위하여 가능한 경로를 탐색하는 라우팅 프로토콜이 반드시 필요하다. 온도와 같은 주변 환경의 급격한 변화를 잘 탐지하도록 설계된 클러스터 기반 계층적 라우팅 프로토콜인 TEEN(Threshold sensitive Energy Efficient sensor Network protocol)을 채택하여 분석하고 단점을 개선하고자 하였다. 따라서 새로운 개념인 SRS(Self Rescue Signal)를 TEEN 프로세스에 적용하여 이벤트 발생 정보를 알 수 없다는 점을 개선하기 위한 방법을 연구하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1640-1641
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• 2011

다양한 환경에서 USN 시스템이 적용됨에 따라 해당 시스템의 효율적인 전력 운용 및 통신 방식이 중요해 지고 있다. 이에 본 논문에서는 태양전지를 사용하여 획득한 전력을 효율적으로 배터리에 충전시키기 위해 히스테리시스 스위치를 사용한 에너지 획득모듈, 센서노드의 효율적인 전력운영을 위해 아이디 기반의 웨이크업 모�뺐� 센싱정보를 전송후 자체적으로 전력을 차단하는 동적전력관리 모듈을 제안 및 구현을 통해 센서노드의 효율적인 전력 운용을 검증했다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.98-101
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• 2006

미래의 컴퓨팅 환경인 Ubiquitous 컴퓨팅에서는 USN을 이용하여 사용자의 위치, 환경, 서비스의 요구사항 등을 인지하고 서로 전달한다. USN에서는 XML 기반의 메시지 포맷을 사용한다. 그에 따라 대량의 XML(extensible Markup Language) 데이터를 고속처리 해야 하는 요구사항이 발생된다. USN과 같은 Ubiquitous 기술은 앞으로 계속 확산될 전망이며, 실시간으로 XML 데이터를 저장/처리해야 할 경우가 증가할 것이다. 이와 같은 추세에 따라 XML을 처리하기위한 데이터베이스의 요구가 점점 증가하고 있다. 본 연구에서는 그에 적합한 데이터베이스의 저장구조를 Main-Memory 데이터베이스와 XML 문서 처리 방법인 DOM을 바탕으로 하여 XML을 효과적으로 저장/처리하는 저장 구조를 설계하였다.