• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.349-351
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• 2003

X3D는 XML 기반의 VRML(Virtual Reality Modeling Language) 차세대 언어로서 인터넷을 통해 동적이고 상호작용 가능한 실시간 가상 환경을 제공해 준다. 본 논문에서는 X3D기반 가상 환경이 제공하는 상호작용을 변경 또는 확장 가능한 새로운 인터페이스 모델을 제시한다. 본 논문에서 제시하는 모델은 X3D 가상 환경에서 사용자 재정의를 통한 상호작용, 새로운 멀티 모달 인터페이스로의 확장, 그리고 상황 인지 가상환경을 위한 상호작용 모델로서 사용될 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06a
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• pp.155-156
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• 2007

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.835-839
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• 2011

상호의존적 국제사회에서 해양은 부의 원천이자 이동수단으로서 중요성을 더해가나, 동북아 해양은 과거 역사유산의 잔재하에 해양갈등요소가 산재하여 국익과 해양안보의 실질적 위협이 되고 있다. 따라서 본 고는 동북아내 해양갈등사례(도서영유권 중심)를 살펴보고 갈등을 부추기는 요인들은 무엇이 있는지 복잡계 이론을 적용 고찰하여 이에 대한 함의와 대응방향을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.85-87
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• 2003

무선환경과 모바일 기기의 발달되고, 모바일 단말기의 보편화로 인해 유선환경에서 제공되던 각종 멀티미디어 서비스가 무선환경으로 옮겨가고 있다. 기존의 웹캐쉬 정책은 그 성능을 이미 검증 받았다. 그러나 그런 정책들은 인기도와 네트워크의 상태만을 고려했기 때문에 무선환경에서는 적합하지 않다. 본 논문에서는 무선환경에서 모바일 호스트의 이동성과 미디어 스트림의 특성을 고려한 캐쉬 교체 정책인 M-LRU를 제안한다. 그리고, 시뮬레이션을 통하여 기존의 LRU정책과 제안한 M-LRU 정책을 비교하였으며, 8-9%의 성능향상이 되었다는 것을 보여준다.

• Review of KIISC
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• v.21 no.6
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• pp.73-78
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• 2011

전자인증 서비스의 보안에 대한 중요성이 높아지고 있는 반면 금융권에서 사용할 수 있는 가이드는 있으나 다양한 분야에 범용적으로 사용할 수 있는 가이드라인이 존재하지 않는다. 본 논문에서는 국내 환경에 적합한 새로운 전자인증 가이드라인 개발에 필요한 요구조건을 분석해 본다. 현재 사용되고 있는 전자인증 수단과 기존의 전자인증 가이드라인 연구동향을 살펴보고 기존 가이드라인의 문제점을 분석한다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.5
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• pp.377-388
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• 2020

In this paper, the autonomous mobile robot whit only LRF sensors proposes an algorithm for avoiding moving obstacles in an environment where a global map containing fixed obstacles. First of all, in oder to avoid moving obstacles, moving obstacles are extracted using LRF distance sensor data and a global map. An ellipse-shaped safety radius is created using the sum of relative vector components between the extracted moving obstacles and of the autonomuos mobile robot. Considering the created safety radius, the autonomous mobile robot can avoid moving obstacles and reach the destination. To verify the proposed algorithm, use quantitative analysis methods to compare and analyze with existing algorithms. The analysis method compares the length and run time of the proposed algorithm with the length of the path of the existing algorithm based on the absence of a moving obstacle. The proposed algorithm can be avoided by taking into account the relative speed and direction of the moving obstacle, so both the route and the driving time show higher performance than the existing algorithm.

• Spatial Information Research
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• v.11 no.3
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• pp.291-299
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• 2003

The Mobile Mapping System collects geographic information through mounted sensors such as a pair of CCD camera, CPS, IMU(Inertial Measurement Unit) and Odometer at regular distance or time interval. The advantage of such system is to easy identification of positions and geographic informations of mobile objects in real time. Among many wireless communication ways for real-time positions and geographic information data from the mobile mapping system to the user such as PDA, wireless modem, cellophane, and web, the web is considered to be more stabile, effect and economic than any other methods. In this paper, a study on the web-based real-time mobile mapping platform to identify the user position is presented using the real-time NovAtel BDS.

• The Transactions of the Korea Information Processing Society
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• v.7 no.5S
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• pp.1726-1735
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• 2000

Internet purchase is increasing according to the activation of Electronic Commerce. Currently, the hardware is main purchase items in the Electronic commerce. The on-line purchase of digital product, that is electronic file type of product, has many merits such as, does not cost in logistics, is ease of searching the product, and is possible of 'Try and Buy' system. But, actually digital products have not been major proudct because of tits piracy problem. The piracy problem of digital products comes from the lack of safety in DP license control technology. Current EC has no method to identify the object that has the right ot use the digital product. The protecting of object change is impossible and the protection of hacking is not enough and EC has any problems in efficient license control because of the incompletion of EC structure. In this paper, e propose the design and implementation of on-line DP circulation system, which can activate on-line circulation of DP in EC and protect its piracy, by using the new license control technology, that is Dynamic License control technology.

• Journal of KIISE:Information Networking
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• v.27 no.1
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• pp.39-47
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• 2000

This paper is to propose an efficient and reliable control procedure of Base Station Controller of mobile communication system for bulk input messages which was delivered instantaneously. We divided the input messages that are processed by the base station controller of the mobile communication system into two things ; they are messages related to call connection and o&m(operation and maintenance). In addition, we analyzed the properties of the input messages and then performed computer simulation on each input message by using M/M/1/K queueing model in term of the following viewpoints : the loss probability of input messages, the average queue length, the utilization of process controller(server),the average waiting time in queue. And we compared the performance of the two input messages in the overload controlling which was caused by the congested input messages.

• KIPS Transactions on Software and Data Engineering
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• v.12 no.10
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• pp.437-444
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• 2023

Location-based services play a vital role in our daily lives. While these services enhance user convenience, user's privacy is at risk because they lead to a rapid surge in collecting and utilizing location information for a user. In this paper, we design and implement an application that securely records and manages user location information. We enhance the privacy protection aspect concerning location information by providing some features. Utilizing Room DB, we store collected personal location information in the user's local database instead of the server of the location-based service provider. Furthermore, user can initiate and terminate recording at their discretion, thereby enhancing the protection of personal information related to location data. User's unease regarding their movement paths is reduced by empowering them to have control over their own location information.