• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1535-1538
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• 2002

본 논문에서는 컨텍스트 인식의 모바일 추천 시스템의 설계를 다룬다. 컨텍스트란 컴퓨터의 위치, 시각, 온도 등을 의미하며 컨텍스트 인식 컴퓨팅이란 이러한 정보들을 이용하는 컴퓨팅을 의미한다. 본 논문에서는 핸드폰이나 PDA와 같은 이동단말기에 GIS 센서가 부착되어 있다고 가정하고 이들 단말기를 통하여 위치정보를 수집한 후에 이를 이용하여 백화점과 같은 매장에서 고객에게 상품을 추천하여 주는 시스템을 설계하였다. 이동 단말기는 일정한 시간간격으로 자신의 위치를 서버로 전송하고 전송된 데이터는 데이터베이스에 저장된다. 저장된 데이터는 간단한 데이터 분석 알고리즘 통해서 단말기 사용자의 구매경향과 흥미도를 예측하여 이를 상품 추천 서버에 제공하고 상품 추천 서버는 이들을 바탕으로 사용자에게 최적의 상품을 추천하게 된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.278-279
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• 2014

모바일 시스템은 제한된 하드웨어 리소스로만 구성된다. 예를 들면, 배터리 용량, 네트워크 대역폭, 저장 용량, 프로세서 성능 등이 그것이다. 이러한 제한된 리소스는 클라우드 서버로의 작업분할을 통하여 경감될 수 있다. 계산량이 많은 부분을 리소스가 풍부한 서버에 전송하고, 서버로부터 결과만을 받아 사용함으로써 리소스의 제약에서 벗어날 수 있다. 작업분할 기술들과 관련하여 많은 연구들이 지난 십 여년 간 진행되었다. 본 연구에서는 이와 관련된 기본적인 논의들을 살펴보도록 하겠다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.645-648
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• 2007

This paper describes database server management system by mobile device. Our system can control database server immediately in any where by mobile device. We have developed the dataset server CE which interface with mobile device, database management system which rons in mobile device and web services which connect the mobile database with desktop database. External mobile device communicate with web service agent via wireless equipment. Our system includes dataset server CE client engine, web service server agent and mobile device management system. Through the test by an application program, we have confirmed that our system operates very well each others.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.935-937
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• 2013

Currently, depending on the penetration of the mobile device, age of one person one mobile device is open. It is a time when mobile equipment is located to the depths of human life that much. However, equipment for new mobile devices full of, was in the existing, tend to sleeping in the house or abandoned. It is determined that you build one server in a mobile device that individuals have, to be able to break out of the framework of the existing service Twitter and blogs, such as Facebook, and to create multiple Web services with a personality of their own. In this paper, we studied a scheme that can be instead of a simple fixed server, considering the characteristics of only the mobile device and take advantage.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.163-165
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• 2014

클라우드 컴퓨팅 기술의 발전 및 모바일 디바이스의 확산으로 데이터센터의 수요가 폭발적으로 증가하고 있고, 데이터 센터내 트래픽 또한 급증할 것으로 예측된다. 따라서 데이터센터 내에 서버용 확장 할 수 있고, 고장방지에 뛰어난 서버센트릭 네트워크 구조가 수많은 서버를 효율적으로 관리할 수 있는 대안으로 제시되었다. 본 논문에서는 서버센트릭 데이터센터에서 서버 배치를 통한 트래픽의 변화에 대해 분석하고 효율적으로 트래픽을 감소시키기 위한 휴리스틱(Heuristic) 접근방법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.789-791
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• 2012

모바일 디바이스 환경이 스마트폰으로 급속하게 변화하면서 다양한 스마트폰용 어플리케이션들의 등장과 함께 비즈니스의 패러다임도 함께 변화하고 있다. 본 논문에서는 스마트폰 단말기 환경에서 단말용 어플리케이션을 통해 오디오 컨퍼런스 시스템이 구현되는 방식을 다루고 있으며, 구현된 시스템에서는 클라이언트 어플리케이션과 컨퍼런스 시스템 간에 웹서버 연동을 위한 안드로이드 API 기술, 클라이언트 어플리케이션과 인증서버 간 Restful 방식의 서버개발 기술, 인증서버와 컨퍼런스 시스템 간 웹서버 연동기술, 서버 데이터 스케줄러 기술, Restful 방식의 서버호출/xml Parser 개발 기술, 이벤트 처리와 컨퍼런스 컨트롤을 위한 스케줄러 구현, 예약시스템을 위한 캘린더 연동 기술이 사용되었다.

• The KIPS Transactions:PartC
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• v.11C no.6 s.95
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• pp.843-850
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• 2004

As mobile devices prevail, requests for various services using mobile devices have increased. Requests for application services that require large data space such as multimedia, game and database [1] specifically have greatly increased. However, mobile appliances have difficulty in applying various services like a wire environment, because the storage capacity of one is not enough. Therefore, research (5) which provides remote storage service for mobile appliances using iSCSI is being conducted to overcome storage space limitations in mobile appliances. But, when iSCSI is applied to mobile appliances, iSCSI I/O performance drops rapidly if a iSCSI client moves from the server to a far away position. In the case of write operation, $28\%$ reduction of I/O performance occurred when the latency of network is 64ms. This is because the iSCSI has a structural quality that is very .sensitive to delay time. In this paper, we will introduce an intermediate target server and localize iSCSI target to improve the shortcomings of iSCSI performance dropping sharply as latency increases when mobile appliances recede from a storage server.

• Journal of Korea Spatial Information System Society
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• v.7 no.3 s.15
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• pp.93-106
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• 2005

Recently, the web map services with standard interfaces have been developed to a high degree for the purpose of sharing of spatial data through the web. Among the various kinds of works related, the specification for the web map service released by Open Geospatial Consortium (OGC) is the most prominent, and is nearly adopted as international standard (ISO/DIS 19128) in developing the web map servers. The web map server of OGC, however, provides the insufficient capabilities for mobile applications. Unlike the wired applications, the mobile applications would require the map server to minimize of size of data transferred, because the size of data is very important factor in communication cost and the response time of map clients. And the mobile applications require different quality of map according to the screen size of mobile devices. The mobile application, also require some application specific queries. In this paper, We have Proposed the interfaces for mobile web map services (M-WMS) which fully comply with the standard interfaces proposed in OGC. And we have designed and implemented the web map server for mobile map services. This paper has contributed to construction and practical use of the web map servers in mobile applications, such as LBS and telematics.

• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.9
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• pp.379-385
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• 2012

This paper suggests U-healthcare system for individual health management realizing the gateway, client, and Java-based network server by using the vital signal measuring system and android-based mobile platform. This study realized the vital signal measuring system based on the technology to measure the ECG, oxygen saturation, blood pressure, and respiration, etc. And all the information of measurement was transmitted to the mobile gateway using the 3-bite transmission protocol consisting of headers and data. The data transmitted to the mobile gateway was used to examine the mobile client's personal health indexes through the network server. This paper realized and tested the android-based gateway, client, and the broadcasting network server and verified their validity with simulations and actual humans. As a result, the U-healthcare system suggested was proved to be effective in managing each individual's health from short distance and long distance. And it could examine each individual's health conditions in real-time and was found to be advantageous in that it could secure the guardian's mobility.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.4
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• pp.828-834
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• 2009

To get a better profit, standalone mobile game market shifts network-based mobile game. Currently, most of the game platform are separated into mobile to mobile, desktop to desktop, and console to console. Multi platform network game has a diverse problems including consistency control, object management technique, and bandwidth inconsistency. n this paper, we will introduce a multi-platform arcade game "Push-Push", which is played on desktop to mobile environment. The game guarantees realtime play between heterogeneous machine users and game item sharing between two platforms. e will focus n the issues of the 3rd generation multi platform games and propose some techniques or solving these problems. Our server database is implemented on MS SQL database, also the desktop programming tool is Visual Basic, and WIPI(Wireless Internet Platform or Interoperability) as a mobile platform.