• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.2
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• pp.3-12
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• 2006

The spread of mobile devices, PDAs and sensors has enabled the construction of ubiquitous computing environments, transforming regular physical spaces into 'smart space' augmented with intelligence and enhanced with services. However, unless privacy concerns are taken into account early in the design process of various ubiquitous devices(e.g. mobile devices, PDAs, sensors, etc.). we will end up crating ubiquitous surveillance infrastructure. Also, it may inappropriate to use public key techniques for computational constrained devices in ubiquitous computing environment. In this paper, we propose efficient user authentication and ky agreement protocol not only to preserve anonymity for protecting personal privacy but also to be suitable for computational constrained devices in ubiquitous computing environments.

• ETRI Journal
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• v.29 no.2
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• pp.169-178
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• 2007

With the advent of ubiquitous computing environments, it has become increasingly important for applications to take full advantage of contextual information, such as the user's location, to offer greater services to the user without any explicit requests. In this paper, we propose context-aware active services based on context-aware middleware for URC systems (CAMUS). The CAMUS is a middleware that provides context-aware applications with a development and execution methodology. Accordingly, the applications based on CAMUS respond in a timely fashion to contextual information. This paper presents the system architecture of CAMUS and illustrates the content recommendation and control service agents with the properties, operations, and tasks for context-aware active services. To evaluate CAMUS, we apply the proposed active services to a TV application domain. We implement and experiment with a TV content recommendation service agent, a control service agent, and TV tasks based on CAMUS. The implemented content recommendation service agent divides the user's preferences into common and specific models to apply other recommendations and applications easily, including the TV content recommendations.

• Architectural research
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• v.12 no.2
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• pp.15-22
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• 2010

Our prediction model is based on the development of "Semantic Location Model." It embodies geometrical and topological information which can increase the efficiency in prediction and make it easy to manipulate the prediction model. Data mining is being implemented to extract the inhabitant's location patterns generated day by day. As a result, the self-learning system will be able to semantically predict the inhabitant's location in advance. This context-aware system brings about the key component of the ubiquitous computing environment. First, we explain the semantic location model and data mining methods. Then the location prediction model for the ubiquitous computing system is described in details. Finally, the prototype system is introduced to demonstrate and evaluate our prediction model.

• Journal of Information Technology Applications and Management
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• v.13 no.3
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• pp.1-28
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• 2006

In the ubiquitous computing environments. people usually carry multiple information technology devices with them. Personal device network (PDN) refers to the way how people connect multiple IT devices for their personal as well as professional purposes. Even though it has been Quite popular to construct the PDN in ubiquitous computing context, not much research has been conducted on how people actually connected multiple devices and what influences their methods of connection. In this paper we conducted a content analysis on community bulletin boards of IT devices and a contextual inquiry with expert users of PDN for investigating the configurations with which users connect multiple IT devices. Base on the results of two related studies, we identified three major types of PDN configurations, and key factors that influence the configurations of PDN. We conclude this research with guidelines to design a set of devices for each of the three configuration types.

• Journal of Information Technology Services
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• v.10 no.2
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• pp.189-202
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• 2011

It is important issue how to evaluate the economic feasibility of computing factors in the real world when we build ubiquitous spaces. In this paper, we propose a simple model that can evaluate the economic feasibility of mobile RFID-based ubiquitous computing system which enables seamless communication between offline and online via embedded computing factors in the real world. To achieve this, we explore the meaning of mobile RFID system, the difference between our research and extant researches concerning the evaluation of economic feasibility in RFID system, and propose the so-called 'Tag-based Evaluation Model' (TEM) which is an evaluation model to access the economic feasibility of mobile RFID systems. We also analyze the TEM via simulation cases based on proposed model and discuss the future of TEM.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.3052-3054
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• 2005

Ubiquitous Computing 환경은 모든 사물과 공간이 지능화되어 사용자가 컴퓨터나 네트워크를 의식하지 않는 상태에서 장소에 구애받지 않고 자유롭게 네트워크에 접속할 수 있는 환경을 의미한다. 만일 이러한 환경 속에서 개인정보들이 노출되었을 경우는 법적, 사회적, 경제적으로 커다란 손실을 초래하게 된다. 이것을 방지하기 위해서는 안정성과 효율성이 높은 암호 알고리즘이 요구된다. 본 논문에서는 한국 표준으로 제정된 ISPN(Involutional SPN) 구조의 블록 암호화 ARIA 알고리즘을 사용하여 고속의 통신망과 Smart Card, PDA, 이동전화 및 다양한 기기 둥의 사용이 보편화될 Ubiquitous Computing 환경에 응용 가능한 ARIA 암호화 프로세서(이하 ARIA 프로세서)를 설계하였다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.31 no.3
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• pp.43-51
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• 2008

Recent advances in mobile computing technologies and platform-independent information systems have enabled to realize a ubiquitous environment. Community computing has been developed as a useful tool for realizing collaborative services in a ubiquitous environment. In this paper, we present a formal model of a ubiquitous space that takes community concept into consideration and propose two management frameworks that prevent conflicts among communities. To demonstrate the validity of the proposed frameworks, an example for coordinating two communities is provided.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06c
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• pp.172-175
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• 2011

본 연구에서는 현장검사 (Point-of-Care Testing, POCT)를 목적으로 측방 유동 검사 스트립의 피크들을 분리하는 템플릿 정합법을 제안한다. 템플릿은 스트립의 제어 리건드 선과 대상 리건드 선 간격으로 떨어져 있는 두 개의 펄스로 구성된다. 이 템플릿을 스캔신호와 정합시켜 최대 응답 위치에서 피크들의 중심을 찾고, 주어진 위치에서 피크들을 분리한다. 제안한 방법을 바디텍메드사의 당화 혈색소 면역 검사 스트립과 동사의 형광 스트립 리더기에 적용하여 농도 측정 성능에 미치는 영향을 기존에 구현된 방법과 비교 검토하였다. 실험 결과 본 연구에서 제안한 방법은 장치나 검사 스트립에 종속적인 매개변수가 필요한 기존 방법과 동등한 성능을 보였다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06c
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• pp.188-190
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• 2011

Image interpolation is a technique that pervades many an application. Interpolation is almost never the goal in itself, yet it affects both the desired results and the ways to obtain them. In this paper, we proposed a technique that is capable to find out the error when the common two methods (bilinear and nearest neighbor interpolation) are applied on an image for rotation. The proposed technique also includes the comparison results of bilinear interpolation and nearest neighbor interpolation. Among them nearest neighbor interpolation gives us a better result regarding to the enhancement and due to least error. The error is found by using Mean Square Error (MSE).

• Journal of Digital Contents Society
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• v.11 no.4
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• pp.473-478
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• 2010

Applying ubiquitous computing technology continues to develop services and to use it also has developed a variety of devices. However, classification of ubiquitous computing service (UCS) is ambiguous and evaluation criteria of UCS are difficult to be applied. In this paper, we define the characteristics and classification of UCS and based on evaluation criteria are derived. In addition, we propose a checklist of evaluation criteria to support the user's choice using UCS.