• 정보보호학회논문지
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• 제28권4호
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• pp.975-985
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• 2018

미래 인터넷 기술 중 하나인 ICN은 콘텐츠 소스에게 집중되는 콘텐츠 요청을 다수의 노드들이 분산 처리함으로써, 콘텐츠 소스의 주변 네트워크에서 발생하는 네트워크 병목 현상을 해결하고, 서비스 시스템이나 네트워크의 운영 상태와 상관없이 지속적으로 콘텐츠를 배포할 수 있다는 장점을 갖고 있다. 특히, CCN은 네트워크 노드에 콘텐츠 임시 저장 기능을 구현하고, 콘텐츠 요청 패킷의 전송 경로 상에 있는 중간 네트워크 노드가 직접 콘텐츠 요청에 응답할 수 있도록 제안되었다. 그러나 이와 같이 분산된 불특정 노드로부터 콘텐츠가 전송될 경우, 사용자가 실제 콘텐츠 제공 노드를 인증할 수 없기 때문에 공격자의 불법적인 서비스 개입 및 악의적인 콘텐츠 변경을 통한 다양한 해킹 공격에 취약할 수 있다. 이러한 문제점을 해결하기 위하여 CCN은 콘텐츠 인증 기능을 제안하고 있다. 본 논문에서는 CCN의 콘텐츠 인증 기술의 문제점을 분석하고 블록체인을 이용하여 이를 개선할 수 있는 방안을 제안한다. 또한, 기존 기술과의 성능 비교 분석을 통하여 개선안의 성능을 평가한다.

• 한국인터넷방송통신학회논문지
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• 제21권2호
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• pp.7-14
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• 2021

사물인터넷과 자유주행 차량의 급속한 기술 발전과 함께, 그 시스템의 복잡성의 수준도 증가하고 있다. 따라서 관련 기업들은 기존의 부피가 큰 단일 서비스 아키텍처를 마이크로서비스 기반 아키텍처로 변경함으로써 증가하는 복잡성을 관리해오고 있다. 그러나 이러한 마이크로서비스의 활용과 배포를 위한 기본 통신 메커니즘은 간헐적이고 연결상태의 문제와 함께 짧은 지연 시간 요건 때문에 미래형 자율주행차량의 요건을 충족하기 어려웠다. 본 논문에서는 정보 중심 네트워킹(ICN) 패러다임을 기본 통신 아키텍처로 채택하여 기존의 문제점들을 해결할 것을 제안한다. 본 연구에서는 자율 차량 시스템을 구축하기 위한 마이크로서비스 접근방식이 ICN을 활용하여 좀 더 효과적인 서비스 제공 및 효율적인 서비스 분배와 균일한 서비스 발견을 달성할 수 있다는 부분에 대하여 조사, 분석 하였다. 본 논문에서 제시하는 방향성은 정보 중심의 마이크로서비스 접근 방식의 비전이 더 효과적이고 가벼운 자율 차량 서비스와 통신 프로토콜 연구에 초점을 맞추는 데 도움이 될 것이다.

• 한국보건간호학회지
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• 제28권3호
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• pp.432-444
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• 2014

Purpose: This descriptive study was conducted in order to investigate the research trends of past nursing studies related to disasters in Korea, and to identify the direction of future research. Methods: Fifty studies conducted from July 1995 to June 2014 were analyzed according to general characteristics, disaster phase, disaster type, and research theme based on the four areas and 10 domains of the ICN Framework of Disaster Nursing Competencies. Results: The majority of studies were designed using quantitative methods (29). In disaster type, 12 studies explored natural disasters, and 14 explored manmade disasters. Disaster responders were the subject of 31 studies. In relation to research topics, the majority of studies were in the area of preparedness competencies of the ICN Framework (26). The studies were concentrated in the domain of education and preparedness (24). Conclusion: The total number of studies on disasters had increased over the years, while the topics failed to deal with all domains of the ICN Framework. The results indicate that the future direction of nursing research on disasters is to be vitalized through the flexibility of research design, systematic approach based on global perspectives, research on emergency responders and vulnerable people, and research relating to community-based disaster nursing.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권7호
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• pp.1610-1623
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• 2013

In-network caching is a key component of information-centric networking (ICN) for reducing content download time, network traffic, and server workload. Data center network (DCN) is an ideal candidate for applying the ICN design principles. In this paper, we have evaluated the effectiveness of caching placement and replacement in DCN with butterfly-topology. We also suggest a new cache placement policy based on the number of routing nodes (i.e., hop counts) through which travels the content. With a probability inversely proportional to the hop counts, the caching placement policy makes each routing node to cache content chunks. Simulation results lead us to conclude (i) cache placement policy is more effective for cache performance than cache replacement, (ii) the suggested cache placement policy has better caching performance for butterfly-type DCNs than the traditional caching placement policies such as ALWASYS and FIX(P), and (iii) high cache hit ratio does not always imply low average hop counts.

• 보건의료산업학회지
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• 제9권4호
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• pp.33-49
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• 2015

Objectives : This study was conducted to measure the effects of healthcare accreditation (HA) on the changes in infection control (IC). Methods : Questionnaires were e-mailed to 60 hospitals from 23 October to 23 December, 2011. Data were analyzed by SPSS 12.0. Results : Finally 50 hospitals (83.0%) were enrolled in the study: Seoul area (40.0%), tertiary (76.0%), and >500 beds (98.0%). Nine hospitals (18.0%) had a full time infection control nurse[ICN] with 300 beds. Among various factors, ICN (36.0%), hospital facilities (66.0%), instruments (32.0%) and supplies (88.0%) all improved. Hand hygiene increased (53.1% vs 83.2%, p<.001), but it was continued only in 34.1% of hospitals. Healthcare-associated infection (68.4%), multi drug resistant organisms (42.1%) and outbreaks (26.3%) decreased. Reasons for difficulties in satisfying the HA standards were inadequate support which included hospital facilities, instruments, budget, and a shortage of ICNs and healthcare workers (HCWs). Conclusions : HA had effects on the IC, but they were transient. Staffing in ICN and HCW staffing, hospital facilities, instruments, and supplies all need to be improved.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권11호
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• pp.3775-3788
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• 2014

With the increasing number of the wireless and mobile networks, the way that people use the Internet has changed substantively. Wireless multimedia services, such as wireless video streaming, mobile video game, and mobile voice over IP, will become the main applications of the future wireless Internet. To accommodate the growing volume of wireless data traffic and multimedia services, cognitive radio (CR) and Information-Centric Network (ICN) have been proposed to maximize the utilization of wireless spectrum and improve the network performance. Although CR and ICN have high potential significance for the future wireless Internet, few studies have been conducted on collaborative operations of CR and ICN. Due to the lack of infrastructure support in multi-hop ad hoc CR networks, the problem is more challenging for video streaming services. In this paper, we propose a Cross-layer Video Streaming Mechanism (CLISM) for Cognitive Radio Ad Hoc Information Centric Networks (CRAH-ICNs). The CLISM included two distributed schemes which are designed for the forwarding nodes and receiving nodes in CRAH-ICNs. With the cross-layer approach, the CLISM is able to self-adapt the variation of the link conditions without the central network controller. Experimental results demonstrate that the proposed CLISM efficiently adjust video transmission policy under various network conditions.

• 대한간호
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• 제18권5호통권103호
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• pp.20-31
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• 1979

• 대한간호
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• 제35권5호
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• pp.65-73
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• 1997

• 대한간호
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• 제22권2호통권120호
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• pp.6-22
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• 1983

• 대한간호
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• 제3권3호통권11호
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• pp.102-104
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• 1964