• Title/Summary/Keyword: exchange of information

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An Information Exchange Scheme among the base stations for reliable wireless Multicasting (신뢰성 있는 무선 다중 전송을 위한 기지국간의 정보 교환 기법)

  • Lim, Ji-Y.;Chung, Tai-M.
    • Annual Conference of KIPS
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    • 2001.04a
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    • pp.503-506
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    • 2001
  • 무선 멀티캐스팅에서 이동 호스트의 기지국간 이동은 멀티캐스트 그룹 내의 이동과 그룹 외의 이동에 따라 각기 다른 신뢰성 문제가 발생한다. 그룹내의 기지국으로 이동시에는 이동 호스트가 원하는 데이터를 해당 기지국이 이미 삭제한 상태라면 이전의 기지국에서 필요한 데이터를 재전송하여야한다. 그룹 외의 기지국으로 이동시에도 역시 필요한 데이터를 포워딩해야한다. 이와 같은 데이터 재전송과 포워딩은 전송 지연과 대역폭의 낭비를 발생시킨다. 본 논문에서는 이와 같은 무선 멀티캐스팅에서의 신뢰성 문제를 해결하기 위한 기법으로 IES(Information Exchange Scheme)을 제안한다. 제안된 IES에서는 멀티캐스트 그룹 기지국간에 멤버쉽과 데이터 수신 정보를 교환함으로써 MH의 이동 범위에 상관없이 신속하고 정확한 전송을 기대할 수 있다. IES를 평가하기 위해 기존의 기법들과 비교 분석하였고 그 결과로 제안된 IES가 효과적인 기법임을 증명한다.

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Implementation of HL7 Interface Engine for Medical Information Exchange (의료정보 공유를 위한 HL7 인터페이스 엔진 구현)

  • Hwang, Deuk-Young
    • Journal of the Korea Society of Computer and Information
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    • v.15 no.8
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    • pp.89-98
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    • 2010
  • Recently supply of Internet is bringing a important change in medical environments. The hospitals which had a different system is required the system that can efficiently share and exchange medical information. In order to transmission medical information between systems, the Health Level Seven(HL7) interface engine development that can convert medical data to HL7 messages is necessary. The HL7 is a standard protocol for data exchange in healthcare environments. In this paper, I implemented HL7 interface engine for Alzheimer's disease in elderly care facility. The interface engine is composed of the client system and the server system. The client system inputs user's medical care data for the aged, and builds them into HL7 message stream. HL7 messages in the client system transmitted over TCP/IP protocol to the server system. The server system parses and validates this messages stream to the segments and fields and then transmits acknowledgement to the client system. I implemented it using the Java and JavaCC. The study of interface engine implementation can be used meaningfully in electronic health record, telemedicine system, and medical information sharing among various healthcare institutions.

Efficient RSA-Based PAKE Procotol for Low-Power Devices (저전력 장비에 적합한 효율적인 RSA 기반의 PAKE 프로토콜)

  • Lee, Se-Won;Youn, Taek-Young;Park, Yung-Ho;Hong, Seok-Hie
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.19 no.6
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    • pp.23-35
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    • 2009
  • Password-Authenticated Key Exchange (PAKE) Protocol is a useful tool for secure communication conducted over open networks without sharing a common secret key or assuming the existence of the public key infrastructure (PKI). It seems difficult to design efficient PAKE protocols using RSA, and thus many PAKE protocols are designed based on the Diffie-Hellman key exchange (DH-PAKE). Therefore it is important to design an efficient PAKE based on RSA function since the function is suitable for designing a PAKE protocol for imbalanced communication environment. In this paper, we propose a computationally-efficient key exchange protocol based on the RSA function that is suitable for low-power devices in imbalanced environment. Our protocol is more efficient than previous RSA-PAKE protocols, required theoretical computation and experiment time in the same environment. Our protocol can provide that it is more 84% efficiency key exchange than secure and the most efficient RSA-PAKE protocol CEPEK. We can improve the performance of our protocol by computing some costly operations in offline step. We prove the security of our protocol under firmly formalized security model in the random oracle model.

A MU-MIMO User Scheduling Mechanism based on Active CSI Exchange (능동적 CSI 교환을 기반으로 한 MU-MIMO 유저 스케줄링 기법)

  • Lee, Kyu-Haeng;Kim, Chong-Kwon
    • Journal of KIISE:Information Networking
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    • v.41 no.4
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    • pp.192-201
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    • 2014
  • User scheduling boosts the Multi-User Multi-Input Multi-Output (MU-MIMO) gain by selecting an optimal set of users to increase the 802.11 Wi-Fi system capacities. Many kinds of user scheduling algorithms, however, fail to realize the advantages of MU-MIMO due to formidable Channel State Information (CSI) overhead. In this paper, we propose a user scheduling method considering such CSI exchange overhead and its MAC protocol, called ACE (Active CSI Exchange based User Scheduling for MU-MIMO Transmission). Unlike most proposals, where user scheduling is performed after an Access Point (AP) receives CSI from all users, ACE determines the best user set during the CSI exchange phase. In particular, the AP broadcasts a channel hint about previously scheduled users, and the remaining users actively send CSI reports according to their Effective Channel Gains (ECGs) calculated from the hint. Through trace-driven MATLAB simulations, we prove that the proposed scheme improves the throughput gain significantly.

Information Dimensions in Library and Information Science Doctoral Mentoring: Qualitative Findings

  • Lee, Jongwook
    • International Journal of Knowledge Content Development & Technology
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    • v.8 no.3
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    • pp.5-28
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    • 2018
  • Socialization of doctoral students refers to the process through which they acquire various types of information about their work, department, university, and discipline for their future careers. This study aims to investigate information behaviors, with emphasis on identifying types of information exchanged in mentoring between faculty advisors and their doctoral students in library and information science (LIS). As a first step to developing a content framework for LIS doctoral mentoring, the author interviewed ten LIS doctoral students from nine U.S. universities. Based on data from these interviews, the author identified sixteen types of information exchanged: language, history, coursework, research, skills, teaching, networking, structure, politics, goals, strategies, values, norms/tradition, rules/policies, benefits, and personal life. In comparison with a content framework used, four dimensions were newly added. In addition to the identification of content dimensions, the author observed four meaningful contextual levels to which the content types can be applied: work, department/school, university, and discipline. The qualitative data also showed that interpersonal factors of advisees/advisors and contextual factors might relate to information exchange in doctoral mentoring. In a following paper, the author will present the results of a follow-up survey that tests and generalizes the findings of this study.

A Study of the Effect on the Level of Knowledge Management for Information Sharing and Knowledge Exchange in Information Center (정보공유와 지식교류 향상을 위한 정보센터의 지식관리 수준에 미치는 영향요인에 관한 연구)

  • Yoon, Jung-Hyeon
    • Journal of the Korean Society for information Management
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    • v.21 no.3
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    • pp.31-44
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    • 2004
  • Information center represents an important source which seems very well suited for knowledge management investigation. Information center is knowledge intensive and the use of advanced technology may transform the knowledge of business processes for delivering an unique capabilities in an organization. To exam knowledge management, organization culture, importance of knowledge, and support of information technology were identified as potential predictors of knowledge management support in information center. Three hypotheses have been tested with 43 database management specialist surveys. This study presents that the level of information sharing and knowledge exchange is significantly influenced by the extent support of information technology.

A Study on the Effect of Digital Literacy Education in Personal Information Security Perception (디지털리터러시 교육이 개인 정보 보안 인식에 미치는 영향 연구)

  • Kwon, Jungin
    • Convergence Security Journal
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    • v.20 no.4
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    • pp.161-167
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    • 2020
  • Convergence ethics education for digital culture in cyberspace is limited to specific areas such as personal information and copyright. Education on the ability to accept information and provide information in cyberspace in which digital natives communicate, share and exchange is inadequate. As a result, the dysfunction of abusing the personal information of others without recognizing the importance of information security has recently emerged as a social problem. In this study, among digital netizen who communicate and exchange information the most in cyberspace, digital literacy education was conducted for students in the first and second grades of university, and then they investigated the change in information security perception. Based on this, we intend to prepare fundamental measures for systematic cultivation of digital literacy education necessary for the Digital Cultural Society.

Implementation of hospital information system using the HL7/DICOM gateway (HL7/DICOM 게이트웨이를 활용한 병원정보시스템 구축)

  • Lee, Sang Young
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.6 no.4
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    • pp.1-10
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    • 2010
  • With the rapid advance of information technology and the popularity of digital medical, medical information are growing, the process of hospital digitalization are gradually quicken and systems involved are more and more. HIS system mainly deals with patient information, it follows the standard of HL7. While PACS system mainly manages image information, it follows the standard of DICOM. Because HIS and PACS deal with different information and follow different standards, it is difficult to directly communicate. This paper presents a method of establishing HL7/DICOM gateway to realize the information exchange of HIS and PACS. The HL7/DICOM gateway designed in this paper is made up of three modules. First, HL7 messages and triggered events are designed to achieve the function of transaction processing module. According to the designed HL7 messages, four message interface functions are defined to accomplish the function of send/receive messages module. Finally, the algorithm of construct/parse messages is given to complete the function of construct/parse messages module. Result shows that HIS and PACS realize information exchange successfully by using the HL7/DICOM gateway Implemented in this paper.

A Conceptual Information Model of Mechanical Assemblies Incorporating Assembly and Kinematic Constraints, and Tolerances (조립 및 기구학 구속 조건, 공차를 포함하는 기계 조립체의 개념적 정보 모델)

  • Han Y,-H.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.2
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    • pp.133-142
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    • 2005
  • This paper proposes an object-oriented conceptual information model of mechanical assemblies, named open assembly model (OAM). The proposed assembly model primarily defines hierarchical relationships between parts and subassemblies. Together with the assembly hierarchy. the model also provides a way to represent tolerances, kinematic information, and parametric assembly constraints. Relational information such as mating conditions and degree of freedom between parts and subassemblies is captured via assembly features and relationships thereof. The information model is described using class diagrams of the Unified Modeling Language (UML), and instance diagrams are used to exemplify the proposed information model. The conceptual model presented in this paper is an integrated information model for assembly representation, which could supply necessary information for tolerance analysis and synthesis, kinematic simulation, and assembly simulation. Such a conceptual information model plays an important role for the exchange of information between modeling, analysis and planning systems. Hence, the proposed model could serve as a framework for developing data exchange standards of mechanical assemblies. The proposed model is demonstrated through a case study of a planetary gear assembly.