• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.567-570
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• 2005

Recently, as mobile paradigms such as telematics or LBS (Location Based Service) have been being more diverse and mobile devices such as PDA (Personal Digital Assistance) or several telematics terminals have been being used more widely, mobile services, for example, mobile geographic information service have been being put more importance by people. In this paper, we propose to adopt S/W and data streaming mechanism as a method to improve performance of mobile geographic information service which is a representative of mobile services based on client-server architecture. The show the effectiveness of proposed methods, we design and implement S/W streaming prototype system and sample mobile geographic information service to be executed on the S/W streaming system.

• 지구물리
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• 제7권1호
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• pp.61-72
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• 2004

실시간으로 수집된 환경방사능 데이터 및 차량위치정보를 무선통신망을 통해 전송 받아 지도 상에 표출하고 핵종별 수집시간대별 분석 및 차량 위치별 수집데이터 분석 등의 통계분석기능과 결과물의 문서출력기능을 지원하고 다수의 감시차량 관제 및 관리가 가능한 서버 클라이언트 환경의 환경방사능 감시 차량관제 시스템을 개발하였다

• 한국군사과학기술학회지
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• 제17권5호
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• pp.637-642
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• 2014

Military communications have limited resources such as poor bandwidth and insufficient link capacity. Numerous hosts in conventional IP networks, including the Tactical Information Communication Network (TICN), the tactical communication system of the Army, focus heavy traffic on a single server via end-to-end connections and in which data delivery latency is caused by exchanging routing information. Content-Centric Networking (CCN), one framework of Information-Centric Networking (ICN), is a novel Internet paradigm in which data can be accessed by the name of the content instead of the location information. This paper provides content caching strategies for applying CCN to military tactical IP networks based on TICN environment.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.364-367
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• 2007

실내위치인식을 위한 플랫폼으로서 RSSI(Received Signal Strength Indicator)기반으로 Zigbee/IEEE802.15.4표준을 따르는 CC2431(Chipcon, Norway)과 베이스스테이션노드를 결합하여 실내위치인식 시스템을 구현하였다. CC2431은 지정된 위치에서 자신의 현재위치를 전송해주는 레퍼런스노드와 인접해있는 레퍼런스노드들의 현재위치(X, Y좌표)와 RSSI값을 수신받아 내장된 Location Engine에서 자신의 현재위치를 계산하여 베이스스테이션노드로 전송해주는 블라인드노드로 구성이 되어있다. 베이스스테이션노드는 블라인드노드의 현재위치를 전송받아서 PC로 데이터를 넘겨주기 위한 게이트웨이로 사용하였으며 서버측의 원격지뿐만 아니라 외부에서도 블라인드노드의 현재위치를 실시간으로 확인할 수가 있다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 추계종합학술대회
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• pp.465-468
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• 2007

센서 네트워크 시스템 기반의 저 전력, 저 비용의 지능형 홈 네트워크 시스템을 설계 및 구현 하였다. RSSI(Received Signal Strength Indicator)기반의 사용자 실내 위치 추적 시스템과 Dynamic multi-hop routing 시스템, 학습형 통합 리모컨을 활용한 능동적 가전기기 제어 시스템을 각각 설계하여 지능형 홈 네트워크 시스템을 구현 하였다. 지능형 서비스를 위해 반드시 팔요한 사용자 위치 정보는 RSSI기반의 삼각측량을 통해 계산하고 측정된 위치 정보값의 오차를 줄이기 위해 Smoothing Algorithm을 적용하였다. 또한 지능형 홈네트워크 서비스 제공을 위해 사용자가 휴대하는 무선 센서노드를 Layout 하여 설계, 제작하였으며 수집된 사용자의 실시간 위치 정보와 환경 센서 데이타는 Dynamic multi-hop routing을 통해 서버 프로그램으로 전달되며 각종 계산을 통해 사용자 위치정보와 환경 정보가 디스플레이 된다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권9호
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• pp.3087-3103
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• 2022

Nearest neighbor query in location-based services has become a popular application. Aiming at the shortcomings of the privacy protection algorithms of traditional ciphertext nearest neighbor query having the high system overhead because of the usage of the double Hilbert curves and having the inaccurate query results in some special circumstances, a privacy protection algorithm of ciphertext nearest neighbor query which is based on the single Hilbert curve has been proposed. This algorithm uses a single Hilbert curve to transform the two-dimensional coordinates of the points of interest into Hilbert values, and then encrypts them by the order preserving encryption scheme to obtain the one-dimensional ciphertext data which can be compared in numerical size. Then stores the points of interest as elements composed of index value and the ciphertext of the other information about the points of interest on the server-side database. When the user needs to use the nearest neighbor query, firstly calls the approximate nearest neighbor query algorithm proposed in this paper to query on the server-side database, and then obtains the approximate nearest neighbor query results. After that, the accurate nearest neighbor query result can be obtained by calling the precision processing algorithm proposed in this paper. The experimental results show that this privacy protection algorithm of ciphertext nearest neighbor query which is based on the single Hilbert curve is not only feasible, but also optimizes the system overhead and the accuracy of ciphertext nearest neighbor query result.

• 디지털산업정보학회논문지
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• 제10권3호
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• pp.127-141
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• 2014

A Vehicle Tracking System consists of GPS tracking device which fits into the vehicle and captures the GPS location information at regular intervals to a central GIS server, and GIS tracking server providing three major responsibilities: receiving data from the GPS tracking unit, securely storing it, and serving this information on demand of the user. GPS based tracking systems supporting a multi-session processing among RMA, RM, and RCP can make a quick response to various services including other vehicle information between RSU and OBU on demand of the user. In this paper we design RSU lower layers and RCP applications in OBU for a multisession processing simulation and test message processing transactions among RMA-RM and RM-RCP. Furthermore, we implement the additional functions of handling access commands simultaneously on multiple service resources which are appropriate for the experimental testing conditions. In order to make a multi-session processing test, it reads 30 resource data,0002/0001 ~ 0002/0030, in total and then occurs 30 session data transmissions simultaneously. We insert a sequence number field into a special header of dummy data as a corresponding response to check that the messages are received correctly. Thus, we find that GIS service system with a multi-session processing is able to provide additional 30 services in a same speed of screen presentation loading while identifying the number of session processing of Web GIS service, the number of OBU service, and the speed of screen presentation loading by comparing a single session and a multi-session of GIS service system.

• International journal of advanced smart convergence
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• 제10권4호
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• pp.278-288
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• 2021

Recently, IoT systems are cloud-based, so that continuous and large amounts of data collected from sensor nodes are processed in the data server through the cloud. However, in the centralized configuration of large-scale cloud computing, computational processing must be performed at a physical location where data collection and processing take place, and the need for edge computers to reduce the network load of the cloud system is gradually expanding. In this paper, a cluster system consisting of 6 inexpensive Raspberry Pi boards was constructed to perform fast data processing. And we propose "Kubernetes cluster system(KCS)" for processing large data collection and analysis by model distribution and data pipeline method. To compare the performance of this study, an ensemble model of deep learning was built, and the accuracy, processing performance, and processing time through the proposed KCS system and model distribution were compared and analyzed. As a result, the ensemble model was excellent in accuracy, but the KCS implemented as a data pipeline proved to be superior in processing speed..

• 디지털산업정보학회논문지
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• 제9권4호
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• pp.69-79
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• 2013

A system of tracking a vehicle collects the vehicle location and then transmits the data into a GIS server in order to provide several service areas. An ODU built in the vehicle savesa GPS information data and communicates with the RSU installed in the road over the wave technology. The collected data in RSU is transmitted into the GIS serverand is stored. The system based on the collected GPS data in each vehicle is providing useful and various services between RSU and OBU. In this paper indicates that the system is designed in 2 phasesbased on the collected GPS data. The result comparing to process of GPS data created in 1 phase and 2 phase over the Web GIS service indicates that the capability of process of the GPS data in 2 phase is enhanced in "50.88% ~ 51.81%". Therefore, when the accident is happened the system of tracking the vehicle over GPS tech not only receives the information properly but also provides the emergence rescue services.

• 한국정보통신학회논문지
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• 제18권6호
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• pp.1395-1400
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• 2014

근태관리 기록은 인사관리의 핵심적인 데이터로서 피고용인의 임금을 계산하기 위한 기초 데이터이다. 그러나 기존의 기계식 또는 전자식 근태관리 시스템은 부정확하고 초기 도입 비용이 매우 크다는 단점이 있다. 이 논문에서는 피고용인의 스마트기기를 이용한 근태관리 시스템을 설계하고 구현한다. 피고용인의 근태 자료를 기록하기 위하여 스마트기기의 맥 주소와 와이파이 무선접근점의 맥 주소를 이용하여 피고용인의 위치 정보를 획득하고 획득된 위치정보를 이용하여 피고용인의 출/퇴근 자료를 서버에 전송한다. 기존의 소유하고 있는 스마트기기와 와이파이 무선접근점을 사용하기 때문에 초기도입 비용이 낮아서 소규모업자들도 쉽게 자동화된 근태관리 시스템을 사용할 수 있는 장점이 있다.