• Journal of Internet Computing and Services
• /
• v.10 no.2
• /
• pp.65-73
• /
• 2009

IEEE802.11 Wireless LAN(WLAN) is being widely used in public space such as airport, and increases the networking boundary in campus and enterprise, and it has lastly attracted considerable attention for mesh network and converged network with other 3G mobile communication networks. In WLAN, load balancing among Access Points(AP) is an important issue for efficient resource management or supporting the Quality of Service(QoS) of traffic, but most researches focused on the AP selection in network entry or roaming of Stations(STA). In this paper, we propose an AP-Initiated Flow Redirection(FR) for AP load balancing by monitoring AP's availability in the true sense. When the AP's resource becomes almost saturated, that is used more than a specific threshold, the AP queries the roaming possible neighbor APs about their availability and calculates the distribution of traffic load with statistical methods such as entropy or chi-square. Finally, the AP decides flows and new APs for redirection and performs it. Our simulation results show that our FR mechanism increases the performance in the various views.

• Journal of the Korea Convergence Society
• /
• v.10 no.4
• /
• pp.153-163
• /
• 2019

The importance and necessity of convergence research to solve complexity and diversity of research problems is more increasing. For successful convergence research, connectivity beyond the boundary and distance between disciplines is a key factor. To understand the current status and characteristics of connectivity among researchers, we investigated the interdisciplinary relationships among 487 researchers' disciplines in a university by using network anaylsis. The results showed that (1) connectivity between similar disciplines were higher than different disciplines, (2) the density and cohesion level of connectivity within the same campuses were higher, and (3) network centrality was concentrated in engineering and medicine. Based on these results, the necessity of overcoming boundaries and distances as obstacles to convergence research and the necessity of diversification of centrality were proposed. While previous studies mainly analyzed the research outcomes, this study is meaningful because it analyzed researchers' connectivity and collaborative structures in the actual convergence research procedures.

• Journal of Korean Library and Information Science Society
• /
• v.46 no.4
• /
• pp.511-527
• /
• 2015

The study aims at constructing adaptation model, CampusQual, to evaluate the services which Tsinghua provides for Korean Students. The study is based on ServQual's "expectation-feeling difference" via conducting a survey on satisfaction on their campus life. We implement a survey including 30 questions in 5 sections: demographic statistics, study & information literacy, campus life, social & culture and regulations. Then through CampusQual model, we analyze the Korean students' adaptation level. CampusQual is a new service model that would enable Korean students to better live and study in universities in China. It also provides feasible suggestions and guidance for administrators on improving campus services for Korean Students.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.4
• /
• pp.753-757
• /
• 2005

Wireless LAN was developed by alternative of LAN and because establishment was easy, have used into special field and special expenditure. Recently, Standard and a technology developed by leaps and bounds. Present is used into purpose of the Building to Building or wide connection etc. and relay of the high speed Internet and usage of picture communication that require multimedia band width. Specially, campus wireless LAM is thought that must secure radius $100\;\~\;200\;m$ dimension at the minimum 10Mbps speed as Internet transit trunk. But, there is difference as degressive here. In this paper, wireless LAN measured for effectiveness proof as Internet transit trunk in actuality utilization environment. Proved that should compose IEEE802.11b as AP more than minimum 3 when compose network to base as measuring result. Hereafter, there is the purpose that achieve performance evaluation of wireless UM in marine environment.

• Journal of Korean Academy of Nursing
• /
• v.49 no.5
• /
• pp.538-549
• /
• 2019

Purpose: This study aimed to explore and compare the knowledge structure of pain management nursing research, between Korea and other countries, applying a text network analysis. Methods: 321 Korean and 6,685 international study abstracts of pain management, published from 2004 to 2017, were collected. Keywords and meaningful morphemes from the abstracts were analyzed and refined, and their co-occurrence matrix was generated. Two networks of 140 and 424 keywords, respectively, of domestic and international studies were analyzed using NetMiner 4.3 software for degree centrality, closeness centrality, betweenness centrality, and eigenvector community analysis. Results: In both Korean and international studies, the most important, core-keywords were "pain," "patient," "pain management," "registered nurses," "care," "cancer," "need," "analgesia," "assessment," and "surgery." While some keywords like "education," "knowledge," and "patient-controlled analgesia" found to be important in Korean studies; "treatment," "hospice palliative care," and "children" were critical keywords in international studies. Three common sub-topic groups found in Korean and international studies were "pain and accompanying symptoms," "target groups of pain management," and "RNs' performance of pain management." It is only in recent years (2016~17), that keywords such as "performance," "attitude," "depression," and "sleep" have become more important in Korean studies than, while keywords such as "assessment," "intervention," "analgesia," and "chronic pain" have become important in international studies. Conclusion: It is suggested that Korean pain-management researchers should expand their concerns to children and adolescents, the elderly, patients with chronic pain, patients in diverse healthcare settings, and patients' use of opioid analgesia. Moreover, researchers need to approach pain-management with a quality of life perspective rather than a mere focus on individual symptoms.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04a
• /
• pp.271-273
• /
• 2002

최근 무선랜 기술이 타 무선솔루션에 비해 비용이 저렴하고 사용하기 쉽다는 장점으로 큰 인기를 끌면서 급속히 확산되고 있다. 무선랜은 캠퍼스 크기의 서비스 지역에서 다양한 인터넷 서비스를 제공하는 기본 인프라로 사용하기에는 적당하나 아직 인증이나 트래픽 제어에 관한 많은 부분에서 개선할 필요가 있다. 기본적으로 무선 서비스 망은 유선 망과의 연동을 위해서 게이트웨이 기반 모델을 사용한다. 본 논문은 유, 무선을 연결하는 게이트웨이 기반의 사용자 인중 및 트래픽 제어를 제공하는 시스템을 구현하여 현재의 무선망에서의 차등화된 QoS 네트워크 서비스를 제공하였다. 구현한 게이트웨이는 향후 다양한 서비스 모델을 수용 할 수 있도록 확장성을 제공한다.

• Proceedings of the IEEK Conference
• /
• 2009.05a
• /
• pp.57-60
• /
• 2009

본 논문에서는 DSDV 프로토콜을 사용하여 MN의 이동으로 포워딩이 실패하면 smooth handoff방식을 사용하지 않고 바로 애드 혹 라우팅 기법을 통해 이동 노드를 통해 데이터그램을 전달하도록 하는 실험을 수행하였는데, DSDV 라우팅 프로토콜을 사용한 방식의 경우 핸드오프가 발생하지 않은 경우와 거의 같은 성능을 나타냈으며, MN의 개수에 따라서는 전송지연시간이 증가하나 핸드오프 발생간격에는 거의 무관하며 기존의 방식들에 비해 전송지연시간이 작아짐을 확인할 수 있다. 중계 노드의 이동은 DSDV 라우팅 방식의 가장 큰 문제점이지만 중계 노드의 이동속도가 실제로는 5m/sec이내가 대부분이므로 크게 문제되지는 않는다. 이와 같은 연구 결과를 캠퍼스와 같이 제한된 지역에서 활용할 경우 smooth handoff의 속도 지연에 대한 문제를 줄일 수 있을 것으로 예상된다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.1161-1164
• /
• 2003

초고속 통신망과 모바일 컴퓨팅 디바이스의 발전이 급속도로 이루어지고 있고, 블루투스나 무선랜 등 무선 네트워크 프로토콜들이 등장함에 따라 가정, 캠퍼스, 회사나 공공 지역에서 무선 인터넷 사용자들이 늘고 있다. 이에 따라 많은 대역폭을 요구하는 멀티미디어 어플리케이션과 다양한 레벨의 품질을 요구하는 어플리케이션이나 사용자들의 요구 또한 늘어가고 있어 이에 대한 QoS 제공 방안이 촉구된다. 따라서 본 논문에서는 무선 인터넷을 가능하게 하는 무선랜과 블루투스를 동시에 지원하는 Accesspoint에서 QoS 지원 방안에 대해 고찰해보도록 한다.

• Proceedings of the Korea Contents Association Conference
• /
• 2017.05a
• /
• pp.501-502
• /
• 2017

사용자의 요구에 맞게 시스템 자원을 할당, 배치, 배포해 두었다가 필요시 시스템을 즉시 사용할 수 있는 상태로 미리 준비해 두는 Provisioning이 이슈가 되고 있다. 비용대비 효과, 컴퓨터 성능향상, 편리성과 효율성, 비즈니스 역량강화의 장점을 추구하는 클라우드 환경에서의 대학정보시스템 구축방향과 일치한다. 또한, 이미 구축한 On-Premise 시스템 기반에서 동일한 소프트웨어, 툴, 에코시스템 애플리케이션을 활용할 수 있도록 소프트웨어 일관성을 보장하며, 이를 통해 비즈니스 민첩성 및 데이터 주도적인 분석 통찰력을 향상시킬 수 있다. 하지만 캠퍼스 클라우드시스템 구현은 네트워크 고도화, 가상화 인프라 고도화, 보안 고도화라는 단계적 전략을 통해서만 완성할 수 있을 것이다.

• Journal of the Korea Society for Simulation
• /
• v.7 no.2
• /
• pp.1-16
• /
• 1998

This paper presents an automated methodology for campus network design and performance analysis using the rule-based SES and DEVS modeling & simulation techniques. Proposed methodology for structural design and performance analysis can be utilized not only in the early stage of network design for selecting configurable candidate from all possible design alternatives, but also in simulation verification for generating performance data. Our approach supercedes conventional methodologies in that, first, it can support the configuration automation by utilizing the knowledge of design expert ; second, it can provide the simulation-based performance evaluation ; third, it is established on the basis of the well-formalized framework so that it can support a hierarchical and modular system design. Several simulation tests performed on a campus network example will illustrate our technique.