• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권5호
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• pp.959-975
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• 2011

Wireless mesh networks enlarge the wireless coverage area by interconnecting relatively stationary wireless routers (mesh routers). As wireless mesh networks are envisioned to provide high-bandwidth broadband Internet service to a large community of users, the Internet gateway, which acts as a central point of Internet attachment for the mesh networks, is likely to suffer heavily from the scramble for shared wireless resources because of aggregated traffic toward the Internet. It causes performance decrement on end-to-end transmissions. We propose a scheme to balance the load in a mesh network based on link quality variation to different Internet gateways. Moreover, under the mesh coverage, mobile nodes can move around and connect to nearby mesh routers while still keeping the connections to the Internet through the best gateway in terms of link quality. In this structure, gateways perform the balancing procedure through wired links. Information about gateways and mobile node's location is distributed appropriately so that every mesh router can quickly recognize the best gateway as well as the positions of mobile nodes. This distributed information assists mobile nodes to perform fast handoff. Significant benefits are shown by the performance analysis.

• International Journal of Contents
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• 제6권3호
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• pp.89-96
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• 2010

The International air transportation industry provides a vital communication link which brings prosperity to many states in our modern age. This invaluable link has been threatened by terrorism. Airlines have been one of the most attractive targets in the eyes of terrorists for several reasons, including particularly the international and symbolic nature of aviation, and the potential of multigovernmental involvement which can inevitably generate wide publicity. Terrorist attacks against civil aviation have been committed since the earliest days of civil aviation history. The first attack against civil aircraft dates back to the early 1930s. Since then, aircraft hijacking and other forms of attack against air transport operations have become one of the most serious challenges to the safety of flying. In recent years, a new form of threats against civil aviation has appeared. Man-portable air defense systems (MANPADS) in the hands of criminals, terrorists, and other non-state actors pose a serious potential threat to passenger air travel, the commercial aviation industry, and military aircraft around the world. The purpose of this study is to provide some countermeasures against such attacks. In order to foster a better understanding of the problem, an introduction of MANPADS and a brief history of attacks using MANPADS are presented. It also examines the level of threats, trends of attacks using MANPADS and the possible countermeasures to be taken by the international community.

• Journal of Communications and Networks
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• 제9권4호
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• pp.394-401
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• 2007

High speed all optical network is a viable option to satisfy the exponential growth of internet usage in the recent years. Optical networks offer very high bit rates and, by employing technologies like internet protocol over wavelength division multiplexing(IP-over-WDM), these high bit rates can be effectively utilized. However, failure of a network component, carrying such high speed data traffic can result in enormous loss of data in a few seconds and persistence of a failure can severely degrade the performance of the entire network. Designing IP-over-WDM networks, which can withstand failures, has been subject of considerable interest in the research community recently. Most of the research is focused on the failure of optical links in the network. This paper addresses the problem of designing IP-over-WDM networks that do not suffer service degradation in case of a single link failure. The paper proposes an approach based on the framework provided by a recent paper by M. Kurant and P. Thiran. The proposed approach can be used to design large survivable IP-over-WDM networks.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.838-839
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• 2016

IEEE 802.15.4는 저전력, 낮은 가격이지만, 긴 생애의 응용에 있어서는 무선센서네트워크를 포함한다. 현재, IP 아키텍쳐인건 아니건 WSN에서 사용되는 802.15.4의 연결은 통신속도 이하이다. 그러한 논거는 어떤 IP의 실제 효율성의 경우의 실험 측정의 확신없이 오랜 기간동안 지속되어 왔다. RFC944에서는 IETF는 저전력, 개인영역네트워크상의 IPv6 통신을 가능하게 하는 6LoWPAN의 규격을 제안하였다. 본 논문에서는 이러한 통신의 방향과 미래의 값진 주제로서 이에 대한 제안을 한다.

• 유통과학연구
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• 제20권11호
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• pp.11-17
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• 2022

Purpose: This article explores the experiences of Research Universities (RU) on distribution-support technologies in commercialisation with a specific focus in the Malaysian context. Research design, data and methodology: A qualitative research was carried out, in which six RU were interviewed. A structured interview was conducted. To analyse and interpret the data was using an approach adopted in qualitative thematic strategy. The findings were transcribed using Atlas.ti software to analyse related themes through a thematic analysis approach to link theories. Results: The findings provide useful insights into the significant roles of distribution-support technologies on the commercialisation strategy and impacts on the ecosystem of innovation and commercialisation in providing the importance of Distribution-support Technologies to strengthen the role of university-industry-community relation to drive the economy towards a high-income nation. Conclusions: This study will contribute theory through commercialisation literature by adding new knowledge concerning the link between universities and distribution-support technologies in commercialisation. Therefore, the practical contributions are significant for universities; industries; research institutes; government and societies to develop and plan strategically for effective, strategic and sustainable distribution-support technologies in innovation and commercialisation ecosystem.

• Journal of Microbiology and Biotechnology
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• 제34권4호
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• pp.795-803
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• 2024

Microorganisms usually coexist as a multifaceted polymicrobial community in the natural habitats and at mucosal sites of the human body. Two opportunistic human pathogens, Pseudomonas aeruginosa and Staphylococcus aureus commonly coexist in the bacterial infections for hospitalized and/or immunocompromised patients. Here, we observed that autolysis of the P. aeruginosa quorum-sensing (QS) mutant (lasRmvfR) was suppressed by the presence of the S. aureus cells in vitro. The QS mutant still displayed killing against S. aureus cells, suggesting the link between the S. aureus-killing activity and the autolysis suppression. Independent screens of the P. aeruginosa transposon mutants defective in the S. aureus-killing and the S. aureus transposon mutants devoid of the autolysis suppression revealed the genetic link between both phenotypes, suggesting that the iron-dependent metabolism involving S. aureus exoproteins might be central to both phenotypes. The autolysis was suppressed by iron treatment as well. These results suggest that the interaction between P. aeruginosa and S. aureus might be governed by mechanisms that necessitate the QS circuitry as well as the metabolism involving the extracellular iron resources during the polymicrobial infections in the human airway.

• 지역사회간호학회지
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• 제9권1호
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• pp.181-199
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• 1998

This study was designed to examine Home Nursing Care in Hospital-based and Community-based programs. This study investigates actual conditions of nursing needs and demands of clients and their family and the state of home nursing services. We hope that this study will improve upon the current home nursing care system. In Korea Home-Nursing Care programs are still developing and only now becoming a part of the health care delivery system. The data was collected by a questionaire the clients developed and modified through literature review by this writer and through 10 nurses who are members of 4 hospital and 3 community- based agencies. In this study 173 clients were selected. The study lasted from Oct. 1997 to March of 1998. The results show that the average age was 64.3, years older than most women clients (63.0%), the average age of a caregiver was 50.9 years old and most were female(77%). Two types of agency clients with a significant difference between social conditions [25.7%] used some form of insurance; 54.3% had the spouse pay expenses; pay 58.5% son and daughters of Hospital-based agencies: patients of social workers were 24.0%, the highest in the community agency. The condition of patients was 63.2% of the foley and nelaton catheter insertion at hospital based agencies. The range of nursing services offered is one of the highest among the 34 kinds of servies including nasogastric tube management basic nursing, ROM exercise, bladder irrigation, wound and sore dressing. For an effective care service factors that disturb each program such as a non-cooperatative family as well as patients themselves need to be lessened. Further more, the following must be emphasized, supportive counsel 27.0%, steady care for patient, 13.3%maintain a sense of security(11.7%), dressing sores and nutrition(10.0%). Although there were a large number of home nursing care services in the community, policy changes have gathered momentum. Fortunately, the scope and level at legal support will be increased in the future. The program should intergrate and link the district or community together. A project to develop a community based home nursing system as soon as possible should be developed. In conclusion, home nursing care nurses training curriculum should be strengthened.

• 한국콘텐츠학회논문지
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• 제11권9호
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• pp.506-514
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• 2011

본 연구의 목적은 지역 이미지를 녹색관광과 연계하여 지속 가능한 개발의 가능성이 있는지 살펴보고, 여가 관광적인 프로그램을 다양화하여 지역 커뮤니티 활성화 방안을 구체적으로 모색하여 보는데 있다. 지역 이미지화 연구를 종합적인 지역 연계성과 관련 지어 추진하기 위하여 본 연구에서는 대전 근교 정뱅이 마을 사례를 문헌연구와 현지 조사법을 병행하여 분석해 보았고, 외국의 성공 사례를 도입하여 비교 연구를 시도하였다. 분석 결과 첫째, 지역의 이미지화는 지역 커뮤니티 공간의 상품화와 지역상생에 긍정적 효과를 주고 있다는 점을 알 수 있었다. 그리고 둘째로는 녹색 루트를 형성하여 도시인들에게 전원으로의 통로 역할을 수행한다는 점도 관찰할 수 있었다. 아울러 이미지화에 성공한 농촌 마을은 농촌 체험과 미술 작품 체험의 공간을 제공하여 교육적 기회의 장으로 승화할 수 있는 가능성이 있음 확인할 수 있었다. 결론적으로 본 연구를 통하여, 도시 근교 소규모 지역 커뮤니티의 녹색관광개발과 이미지화 연계 작업이 나아갈 방향을 제시하고, 관련 실무자들에게 지역 경영 및 관리방향에 대한 실절적인 지표 역할을 수행할 수 있으리라고 본다.

• 융합정보논문지
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• 제10권6호
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• pp.200-208
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• 2020

이 연구의 목적은 보건의료복지 서비스제공자와 정책대상자인 지역주민의 커뮤니티케어에 대한 인식을 파악 및 비교하는 것이다. 연구대상자는 서울시 J구의 보건의료복지 서비스제공자 68명과 지역주민 95명이었다. 자료 수집은 2018년 12월에 이루어졌으며, independent t-test, chi-square test를 이용하여 분석하였다. 분석 결과 서비스제공자가 지역주민에 비해 커뮤니티케어 정책의 필요성, 방문의료, 방문간호, 방문간병에 대한 동의 정도가 높았다. 돌봄이 필요한 지역주민을 지역사회자원에 연계해 줄 수 있는 정도에 대해서는 서비스제공자가 지각하는 수준이 높았으나, 자립생활을 위한 지역주민 간 자조모임의 활성화 정도는 지역주민이 높게 나타났다. 커뮤니티케어에 소요되는 비용을 위한 건강보험에 일정 보험료를 추가 방식에 대한 동의 정도는 지역주민에서 낮게 나타났다. 두 군 모두에서 커뮤니티케어 정책 실행을 위해 재원 마련과 지역공동체 돌봄 문화가 가장 중요하다고 인식하였다. 그러므로 커뮤니티케어 정책을 효과적으로 운영하기 위해 정책대상자인 지역주민의 인지 수준을 높이고, 정책현황과 정책대상자의 견해 차이를 줄이기 위한 활발한 교류를 통해 지역사회의 돌봄 문화를 정착해나가는 것이 필요하다.

• 미생물학회지
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• 제46권1호
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• pp.1-8
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• 2010

미생물 군집과 기능연구를 위한 최근의 새로운 분석기술의 발전은 다양한 유전 관련 정보를 제공해왔다. mRNA를 포함하는 핵산을 기초로 한 연구를 뛰어넘어서 메타프로테오믹스는 미생물 군집의 유전형 및 표현형의 특징적인 정보를 보다 정교하게 제공할 수 있다. 이미 서로 다른 미생물 생태계인 해수, 인간의 배설물, 활성 슬러지, 산성 광산 폐수 생물막, 토양 등에 메타프로테오믹스 기술이 유용하게 사용되었다. 이들 연구는 여러 측면에서 상당히 다르지만 미생물 군집의 구조, 기능, 생리, 상호관계, 생태, 진화적 측면을 결정적으로 상호 연결한다는 것을 밝혀냈다. 본 총설은 메타프로테오믹스에 대한 현재까지의 가장 최신의 정보를 요약하여 제공함으로써 메타프로테오믹스에 대한 정확한 이해와 활용을 통해 다방면의 메타프로테오믹스가 가능하도록 하고자 하였다.