• The KIPS Transactions:PartD
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• v.17D no.1
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• pp.9-16
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• 2010

Web service mashup bacomes one of the important web application development methods. This paper considers a client based mashup, where a page interfaces many service methods asynchronously. Browser systems execute callbacks when the corresponding reply arrives, possibly concurrent to user interface actions. In this case, callbacks and user interface actions share data memory and screen. Moreover, when the user is able to send another request before the previous ones have replied, the shared resource problem becomes more complicated. In order to solve the multiple requests problem, our contributions are as follows. First, we modeled a mashup page with user actions and callbacks, and we presented several types of callbacks. Secondly, concurrency condition is defined between callbacks and user actions in terms of shared resources, and the test method is presented. Also, we proposed the serialization approach to guarantee the safe execution of callbacks. Finally, we applied the proposed concurrency condition on XForms language and extended the XForms browser to implement the proposed approach. The prototype implementation showed that the proposed approach helps enhancing user experience on mashup pages.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.236-236
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• 2018

한국농어촌공사 농어촌연구원에 구축되고 있는 대형 수리모형 실험시설은 수공구조물에 대한 수리모형실험 수행, 설계기준 제 개정, 호안 검인증제도 지원 등 국가의 정책지원과 개방 공유를 통한 국내 건설기업의 하천분야 신기술 개발 및 국가 경쟁력 확보, 하천 관련 원천기술 확보 등 다양한 목적을 가지고 진행되고 있는 대규모 분산공유형 실험시설에 해당한다. 본 사업의 일환으로 현재 구축 진행되고 있는 7종의 실험수로는 장기하상변동, 토석류, 실규모 호안블록, 감세공 수리특성, 신형어도개발 등 다양한 수리특성에 대한 계측 및 분석이 가능한 대형 실험시설에 해당한다. 7종의 실험수로는 PIV시스템의 연계 계측이 가능한 1) 고정식개수로, 2) PIV실험수로와 1/5의 역경사 재현이 가능한 3) 가변식경사수로, 호안블록 및 사석의 소류력 측정이 가능한 4) 고정식급경사수로, 토석류흐름 측정이 가능한 5) 가변식하도실험수로, 장기하상변동 분석을 위한 6) 대형유사순환수로, 부유사의 침 퇴적 양상 재현을 위한 7) 소형유사순환수로로 구성되어진다. 7종의 실험수로는 '18년 2월에 착공하여 현재 실시설계도서를 검토 중에 있으며, 18년 9월에 준공될 예정이다.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.27 no.3
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• pp.75-98
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• 2016

The sharing economy has been evaluated as a sustainable system dominating the next 10 years and one of the 10 ideas which can change the world. The purpose of this study is to reveal whether there is any relevance between the sharing economy and libraries, if the library can be the core model of the sharing economy, and to propose how libraries could contribute to a sharing economy. To this end, literature related to the sharing economy and the actual cases of its implementation were analyzed. The results are as follows: First, the library was evaluated as a successful model of the sharing economy because it has shared information and tools for centuries. Therefore, it was concluded that the library could be an institution that can lead to a sharing economy. Second, it was analyzed that the library could foster the sharing economy through offering its space, and functioning as the infinite imagination room and smart work center, sharing goods through Little Free Libraries, as well as various other resources of library, and sharing various types of knowledge including reference services. Third, it can be said that the possibility of realizing a shared economy in libraries is inexhaustible, and librarians can play an active role and will positively influence the success or failure in terms of realizing the sharing economy. In the future, there needs to be a study to measure the practices and the performance of the sharing economy of libraries.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.473-476
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• 2007

본 논문에서는 LBT(Listen Before Talk) 방식을 사용하는 ZigBee와 FH(Frequency Hopping) 방식을 사용하는 DCP, RFID, Bluetooth 등의 소출력 무선기기가 공유주파수대역에 공존할 경우 요구되는 적정 채널수를 산출하고 전체 공유주파수대역폭 산출법을 제시하였다. 한정된 주파수 대역에서 LBT 및 FH 방식을 사용하는 총 User 수가 포용되는 공유주파수대역폭 산출은 중요한 작업이다. 소출력 무선기기 시스템의 간섭 회피 기술로 사용되는 FH 방식과 LBT 방식에 대기행렬이론(Queueing Theory)을 적용하였으며, 주위의 전파환경을 감지하여 유휴 주파수대역을 찾아 데이터전송을 시도하는 LBT 방식은 random하게 주파수채널을 이동하며 통신을 시도하는 FH 방식과는 구별된다. 채널수 별 User의 통신시도 시간간격을 통계적으로 처리하여 Throughput을 분석한 결과, Throughput 70% 조건에서 FH 방식과 LBT 방식을 사용하는 250mW 소출력 무선기기들이 공존하는 공유주파수대역의 적정 채널수는 30개를 가지며, 전체 공유주파수대역폭은 채널수에 채널당 대역폭의 곱으로 산출이 가능하다.

• The KIPS Transactions:PartA
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• v.10A no.4
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• pp.347-356
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• 2003

The OCT algorithm needs efficient hardware architecture to compute inner product. The conventional methods have large hardware complexity. Because of this reason. a computation sharing multiplier was proposed for implementing inner product. However, the existing multiplier has inefficient hardware architecture in precomputer and select units. Therefore it degrades the performance of the multiplier. In this paper, we proposed a new efficient computation sharing multiplier and applied it to implementation of 1-D DCT processor. The comparison results show that the new multiplier is more efficient than an old one when hardware architectures and logic synthesis results were compared. The designed 1-D DCT processor by using the proposed multiplier is more high performance than typical design methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.280-283
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• 2000

Users of computer interfaced with the LAN use the same printer with time sharing. Alternatively, Hey use the multi-user printer interface to print in the office which can't have LAN system due to the great expenses. Otherwise they have to connect directly moving the printer to computer. In this papaer, we present a new printer interface equipment which can interface a printer and multi computers through wireless using the radio frequency of about 430MHz. The tranceivers of the equipment consist of two part: one part is installed in parallel port of computer and other part is installed in Centronix port of printer. Their maximum data rate is 9600bps and the communication area is about 50 meters in best case.

• Journal of Internet Computing and Services
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• v.11 no.4
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• pp.95-106
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• 2010

Recently multiple process communicate together. They share resource and information for cooperation in complicated programming environment. Kernel provides IPC (Inter -Process Communication) for communication with each other process. Shared Memory is a technique that many processes can access to identical memory area in the Linux environment. In this paper, we propose a performance improvement method of shared memory in the dual-core embedded linux system which is consist of different core and different operating system. We construct the MPC2530F (ARM926F+ARM946E) linux system and measure the performance therein. We attempt a performance enhancement in each CPU for each process which uses a shared memory.

• Journal of Digital Contents Society
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• v.8 no.4
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• pp.587-592
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• 2007

This paper explains the design and implementation of the EC_NH. EC_NH is a system that is suitable for detecting, sharing and recovering software error based on multimedia CSCW(Computer Supportes Cooperated Work). With error sharing system, a group cooperating users can share error applications. From the perspective of multimedia collaborative environment, an error application becomes another interactive presentation error is shared with participants engaged in a cooperative work. Our Digital Carousel enables user to share media objects through media synchronization mechanism. We implemented the Digital Carousel so that the users participated in collaborative work may refer shared media or error objects as the same view to others.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.85-87
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• 2004

유무선 인터넷 기술의 발전은 인터넷을 통한 개인 정보의 효율적인 공유 및 교환을 가능하게 하였다. 최근 이러한 분산 정보의 공유를 위한 네트워킹 기술로 P2P(Peer-to-Peer)가 많은 주목을 받고 있다. 현재 국내외의 많은 대학 및 기관에서 P2P에 관한 연구가 활발히 진행 중 이다. 하지만, 대부분의 P2P 시스템들은 파일공유 위주의 서비스를 제공하며 SETI@HOME을 필두로 한 일부 @HOME 프로젝트들만이 자원 공유 서비스를 제공하고 있다. 그러나 기존의 자원공유 P2P 서비스들은 특정한 목적을 위해 구성됨으로써 자원을 제공하는 일반 사용자는 단순히 자원을 제공할 뿐 그 이상의 역할을 수행할 수가 없다. 이에 본 논문에서는 P2P 시스템에 참여한 모든 사용자가 P2P의 자원 네트워크를 사용할 수 있도록 멀티 에이전트 기반의 자원 공유 P2P 시스템을 제안한다. 일반 사용자는 서비스 생성 프레임워크를 사용하여 자신에게 필요한 테스크 에이전트를 생성할 수 있으며, 스케줄러 및 분배 에이전트, 테스크 에이전트에 의해 수행되어진다. 또한 본 시스템은 group 및 peer의 관리를 위해 특성 학습 에이전트(Specific Learning Agent)의 학습기능을 사용함으로써 P2P가 가지는 불안전한 환경 및 신뢰성 문제를 해결하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.6
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• pp.123-134
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• 2006

We propose a quantum secret sharing protocol which can authenticate more than half of members using GHZ state swapping. The Trusted Third Party, Trent can authenticate all members using previously shared ID among Trent distributing his message and the members wanting to reconstruct the message. Authenticated members can reconstruct a secret message through GHZ swapping. Moreover, this protocol is efficient to expand the number of members to arbitrary number n, so it is a close quantum secret sharing protocol to classical secret sharing protocol.