• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.822-824
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• 2012

모바일 디바이스는 PDA, 휴대전화 등 고정된 역할을 수행하는 임베디드 개념에서 스마트폰, 태블릿 PC 등 다양한 역할을 동시에 처리하는 스마트 개념으로 진화하고 있다. 이러한 변화에 따라, 모바일 디바이스는 가정용 및 일반 상업용에 국한되지 않고, 산업용 유무선 원격 컨트롤러, 디지털 정보 안내 시스템 등 산업 현장에서도 관심과 역할이 증대되고 있으며 적용분야를 점차 확대하고 있다. 기존의 모바일 디바이스는 내부 메모리에 단일한 운영체제를 탑재하여 다양한 운영체제를 사용하고자 하는 사용자의 요구를 충족시키지 못하고 다른 운영체제 사용을 위한 추가적인 가상화 프로그램 사용으로 인해 제한된 자원을 소모하게 만들며 사용자 데이터는 내부 메모리 혹은 단일한 외부 메모리에 저장하여 디바이스 분실이나 파손시에 데이터의 손실과 개인정보의 유출 등의 문제를 가지고 있다. 본 논문은 모바일 디바이스의 외부 메모리 슬롯을 증설하고 운영체제를 외부 메모리에 탑재하여 외부 메모리 교체를 통한 다기종 운영체제의 사용과 필요시 추가적인 데이터 저장 용도의 외부 메모리를 사용할 수 있는 모바일 플랫폼을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.1092-1095
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• 2007

RFID 인식 기술을 이용한 출입 통제 시스템은 RFID 태그가 개인의 신분을 나타내고 개별 인식을 통해 출입을 통제 관리한다. 시스템은 관리자의 휴대용 기기(PDA)나 PC 등과 같은 다양한 사무기기를 통한 모니터링 기능의 지원이 필요하다. 본 논문에서는 RFID 를 이용한 출입 통제 시스템을 구축하고 이상 징후 시 자동 알림 기능 지원 및 오피스 네트워크 애플리케이션들과 상호 운용이 용이한 UPnP 미들웨어를 적용한 UPnP 기반의 RFID 시스템을 설계 구현한다. 설계 구현된 시스템은 UPnP 기반의 RFID 서비스 발견 기술을 지원한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.5B
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• pp.512-521
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• 2003

In this paper, we introduce our experience of the design and implementation of mobile collaboration system(MCS) that support people using mobile devices to participate in cooperative session. There are considerable differences between desktop PC and mobile devices like PDA in processing ability, resolution of display and color degree. In the case of mobile devices, they use different processors and different operating system and they have even differences in ability of executing application. The mobile collaborative system based on T.120 protocol of ITU-T standard compromised of mobile collaboration server, mobile collaboration client, session node and application. We also define the session node in desktop PC in which session control block and communication block runs. This node provide functions of session control block and communication block to mobile collaboration clients and so lighten load of clients. The mobile collaboration server provides information of candidates for session node, session and user to mobile collaboration client. And this server support clients to configure their own session node and manage sessions. Only the mobile collaboration client module and applications including APE are executed in a mobile device when user using mobile devices would like to participate in cooperative session. We implemented mobile collaboration client and applications with JAVA to support platform independency.

• Journal of KIISE:Computer Systems and Theory
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• v.34 no.5_6
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• pp.238-248
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• 2007

As the demand of employing various PC software on mobile embedded devices which have limited storages has been increased, software streaming services are needed. However it takes too much time to launch software on them because it is transferred through wireless networks. To address this problem, prefetch algorithms are needed. We examined 'Last successor (LS)' algorithm and PPM-based prefetch algorithm as prefetch algorithms for software streaming services. We present 'Probability-base Multi Successor (PMS)' algorithm which is contrived through analyzing evaluations of previous algorithms and characteristics of software streaming services. While LS has one successor per each block, PMS has N successors based on probability which is calculated by PPM-based prefetch algorithm. The hit rate of PMS is similar to that of PPM-base prefetch algorithm and the space overhead is similar to that of LS. We can get good efficiency at the point of memory usage when PMS is applied to software streaming services.

• Journal of KIISE:Software and Applications
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• v.33 no.9
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• pp.776-786
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• 2006

This paper proposes XML based mobile information visualization system using rectangle layout to show effectively XML based information to user on mobile devices which do not have a rich display feature. We define XML schema that can describes information in graph with cycle as well as information in tree form. It suggests using rectangle layout method that is an improvement of the traditional method of the radial layout because the specificity of the mobile display should be considered when XML information is rendered on the screen. And then, it applies DOI of fisheye view algorithm to information on the rectangle layout to represent all and user interest information. And it also suggests an effective method considering capability of mobile devices to decrease user's confusion and improve awareness of user when a user Interest target selected. The proposed information visualization system in the form of focus+context supports an effective interface for information retrieval via mobile devices, such as PDA, cellular phone and smart phone, that usually have less power of CPU than that of PC and the constraints of display and memory. In this paper, it performs experiments and makes an evaluation comparing information visualization method between the traditional radial layout and the proposed rectangle layout.

• Journal of Broadcast Engineering
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• v.8 no.4
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• pp.410-426
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• 2003

MPEG-21 defines a digital item as an atomic unit lot creation, delivery and consumption in order to provide an integrated multimedia framework in networked environments. It is expected that MPEG-21 standardization makes it Possible for users to universally access user's preferred contents in their own way they want. In order to achieve this goal, MPEG-21 has standardized the specifications for the Digital Item Declaration (DID). Digital Identification (DII), Rights Expression Language (REL), Right Data Dictionary (RDD) and Digital Item Adaptation (DIA), and is standardizing the specifications for the Digital Item Processing (DIP), Persistent Association Technology (PAT) and Intellectual Property Management and Protection (IPMP) tot transparent and secured usage of multimedia. In this paper, we design an MPEG-21 terminal architecture based one the MPEG-21 standard with DID, DIA and DIP, and implement with the MPEG-21 terminal. We make a video summarization service scenario in order to validate ow proposed MPEG-21 terminal for the feasibility to of DID, DIA and DIP. Then we present a series of experimental results that digital items are processed as a specific form after adaptation fit for the characteristics of MPEG-21 terminal and are consumed with interoperability based on a PC and a PDA platform. It is believed that this paper has n important significance in the sense that we, for the first time, implement an MPEG-21 terminal which allows for a video summarization service application in an interoperable way for digital item adaptation and processing nth experimental results.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.1C
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• pp.74-79
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• 2006

When DRM systems are built on a specific computing platform and a coding algorithm, the interoperability among them will be improbable. For enhanced compatibility, MOSES has been developed such that it has a structure that can be decomposed into independent modules for interoperability with other DRM systems with IPMP functionality. In MOSES, security in contents transaction is provided by JPWallet which controls licenses with key management. In this paper, we present the structure of JPWallet and how the keys are handled between contents servers and contents-consuming clients. The PDA-based codes from the prototype MOSES system have been ported into PC-based codes and tested for compatibility. Analysis of JPWallet, which is the core of MOSES, will contribute to the standardization of domestic IPMP systems compatible with global standards.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06d
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• pp.355-357
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• 2006

네트워크 카메라는 인터넷을 통해 디지털 영상 전송이 가능하고, 다수의 사용자에게 동시에 같은 영상을 실시간으로 제공해줄 수 있다. 이와 같은 네트워크를 이용한 감시 카메라를 위한 기술은 효율적인 서버 기술, 네트워크 기술, 전송 기술, 압축 기술 등과 함께 영상을 재생할 수 있는 클라이언트 기술을 필요로 한다. 이러한, 클라이언트 측의 기능은 PC 등의 데스크탑 뿐만 아니라, 유무선 통신 단말기, PDA 등의 모바일 단말로까지 그 범위를 넓혀가고 있으며, 특히, 셀룰러폰의 수요가 급속히 증가하면서, 모바일 환경에서의 감시 필요성 및 요구가 확대되고 있다. 최근, 이와 관련된 기술과 제품이 개발되고 있기는 하지만, 대부분 특정 모바일 플랫폼에서만 서비스가 가능한 실정이다. 따라서, 본 논문에서는 이러한 제약을 해결하기 위하여 기존의 다양한 모바일 플랫폼을 통합하여 플랫폼 간의 호환성과 이식성을 제공하는 WIPI를 기반으로 한 실시간 영상 감시용 뷰어를 개발하여, 네트워크 카메라로 접속하여 영상을 재생할 수 있도록 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.740-744
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• 2003

Nowaday, a system development which does to the foundation is drawing the concern that new foundation technique for Web application development. Various terminal is a service supply is not easy. Because of the protocol to use differs for every each terminal, We must make a server program the each every protocol. A reservation system setup itself was not easy at the reason. Because of the importance of the field which is the mobile have been enlarged to a day, We have been raised in reality to the problem to solve. This facility which the technique supports in the paper to use, We can offer the service to server program. The design will try to implement about the reservation system besides.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.18 no.7
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• pp.647-651
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• 2005

We studied the external pressure-stable advanced frnge field switching (FFS) pixel design with 3 slit sructue. In this mode, a patterned pixel slit is partitioned into 3 areas, namely, two edges and a center, where the edge slit angle is larger than the center slit angle. Thus the reverse twist region in the pixel edge is reduced comparing to the conventional FFS mode so that the LC dynamics in this region becomes very stable. And also, when the external pressure is applied to the panel at the high voltage, the disclination lines (DLs) were barely intruded into active area. Therefore, the structure is use for the pen based system such as the tablet personal computer (PC), personal digital asistant (PDA).