• 한국통신학회논문지
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• 제34권9B호
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• pp.947-954
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• 2009

모바일 애드-혹 네트워크에서 현재 상황에서 원하는 시간에 원하는 서비스를 검색, 사용할 수 있는 서비스 디스커버리 기법은 중요 이슈이다. 본 논문에서는 DHT 기반 서비스 디스커버리 기법과 P2P 캐싱 기법을 혼합하여 효율적인 서비스 디스커버리 기법을 제안한다. 제안한 기법은 DHT기반으로 CAN과 같이 2차원의 논리적 영역에 해시된 정보를 저장하고 이를 이용하여 서비스를 검색한다. 또한 서비스 검색을 빠르게 하기 위하여 P2P 캐시를 기반으로 이웃 노드의 정보를 사용하여 서비스 검색 성능을 향상시킨다. 제안된 기법은 노드의 부하를 가중 시키며 병목 현상을 일으키는 중앙 서버를 사용하지 않고 많은 메시지를 생성하는 브로드캐스팅 방식을 사용하지 않는다. 그러므로 네트워크에서 노드에게 부하를 균등하게 배분하며 서비스 디스커버리를 이용하여 서비스를 검색하는데 필요한 메시지수를 줄이고 평균 탐색 거리를 줄임으로서 전체 네트워크 로드와 응답 시간을 향상 시킬 수 있다.

• Journal of information and communication convergence engineering
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• 제4권4호
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• pp.141-146
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• 2006

In these days, wireless data services are becoming ubiquitous in our daily life because they offers several fundamental benefits including user mobility, rapid installation, flexibility, and scalability. Moreover, the requests for various multimedia services and the Quality of Service (QoS) support have been one of key issues in wireless data communications. Therefore the research relative to Medium Access Control (MAC) has been progressing rapidly. Especially a number of QoS-aware MAC schemes have been introduced to extend the legacy IEEE 802.11 MAC protocol which has not guaranteed any service differentiation. However, none of those schemes fulfill both QoS features and channel efficiency although these support the service differentiation based on priority. Therefore this paper studies a novel MAC scheme, referred to as Enhanced Distributed Coordination Function with Network Adaptation (EDCF-NA), for enhancements of both QoS and medium efficiency. It uses a smart factor denoted by ACK rate and Network Load Threshold (TH). In this paper, we study how the value of TH has effect on MAC performance and how the use of optimal TH pair improves the overall MAC performance in terms of the QoS, channel utilization, collision rate, and fairness. In addition, we evaluate and compare both the performance of EDCF-NA depending on several pairs of TH and the achievement of various MAC protocols through simulations by using Network Simulator-2 (NS-2).

• 디지털콘텐츠학회 논문지
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• 제17권6호
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• pp.479-487
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• 2016

Web 2.0 환경에서, 사용자는 사용자 (또는 소비자)와 개발자 (또는 제작자) 간의 실시간 상호 작용을 허용하는 수많은 스마트 장치 및 서비스에 노출되고 사용하게 된다. 사용자 컨텍스트 기반의 새로운 사용자 생성 서비스를 제공하기 위해서 서비스 생성 경험의 관리는 매우 중요하다. 본 논문에서는 서비스 작성을 위한 확장된 데이터 모델을 소개하고, 이 데이터 모델에 기반한 신규 서비스 생성, 서비스 생성 데이터의 관리, 그리고 내/외부 서비스 저장소에 대한 의미적 검색을 가능하게 하는 서비스 생성 관리 아키텍처를 제안한다. 또한, 홈 환경과 모바일 환경에 걸친 두 가지 시나리오를 사용하여 제안 아키텍처를 사용하는 방법에 대해서도 설명하며, 서비스 생성 데이터 관리를 위해 제안한 아키텍처는 서비스 생명주기 동안의 서비스 생성 데이터를 일관성 있게 관리할 수 있다.

• 한국전자거래학회지
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• 제4권3호
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• pp.77-94
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• 1999

The Electronic Commerce is expected as one of the most prospective industries in the 21th century, This research performed a survey and analysis is based on the results of the service quality model and previous research of the service quality in MIS. Service quality, one instrument developed by the marketing area, is provided as a possible measure of internet shopping mall, Service quality measures five service dimensions of tangible, reliability, responsiveness, assurance and empathy. The main purposes of this study are to develop an exploratory model based on service quality that can explain the factors of customer's perceived service quality and investigate how these factors are related to consumer satisfaction. The results of this survey are summarized as follows: (1) Reliability and responsiveness of internet shopping mall are evaluated as very important factors, (2) Service quality is an antecedent of consumer satisfaction, (3) Consumer satisfaction has a significant effect on purchase intentions.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 1999년도 추계공동학술대회 논문집:21세기지식경영과 정보기술
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• pp.65-80
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• 1999

The Electronic Commerce is expected as one of the most prospective industries in the 21th century. This research developed a survey and analysis is based on the results of the service quality model and previous research of the service quality in MIS. Service quality, one instrument developed by the marketing area, is provided as a possible measure of internet shopping mall. Service quality measure five service dimensions of tangible, reliability, responsiveness, assurance and empathy. The main purposes of this study are to develop an exploratory model based on service quality that can explain the factors of customer's perceived service quality and investigate how these factors are related to consumer satisfaction. This study also focus on relationships among service quality, consumer satisfaction, and purchase intentions. The results of this survey are summarized as follows: (1) Reliability and responsiveness of internet shopping mall are evaluated as very important factors, (2) Service quality is an antecedent of consumer satisfaction, (3) Consumer satisfaction has a significant effect on purchase intentions.

• 가족자원경영과 정책
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• 제3권2호
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• pp.33-50
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• 1999

The purpose of this study is to analyze the relationship of housewives’sense of ancestral service and behavior and to verify the how housewives’value orientation affects the sense of ancestral service and behavior. The data are collected from 393 housewives in urban. The statistics used for the analysis are Cronbach’$\alpha$, Frequency, Percentage, Mean, SD, and Multiple Regression Analysis. The results are summarized below: First, among the variables, degree of fate-control orientation is the most, on the contrary, material orientation is the lowest. Second, value orientation variables that affect sense and behavior of ancestral service are material orientation and gender equilibrium orientation. Third, the behavior of ancestral service is more traditional than sense of ancestral service. Fourth, cause-and-effect variable which affect behavior of ancestral service are education level, religion(Buddhism, Catholicism), employment status, number of children, health, daughter in -law’s ranking, sense of ancestral service, and value orientation, which affect the direct or direct and indirectly. Especially sense of ancestral service variable is the most important mediation one. We expect further studies on the sense of ancestral service and behavior with precise scale and sampling.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.645-655
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• 2008

As wireless connectivity is integrated into many handheld devices, streaming multimedia content among mobile ad-hoc peers is becoming a popular application. In this paper, we propose a dynamic service replication algorithm for providing guaranteed continuous streaming services to all nodes in mobile ad-hoc networks (MANETs). First, a MANET is comprised of logical grid hierarchy, and a streaming service is replicated to a lower server region of the logical grid hierarchy by considering the link availability between a mobile node and the streaming server within a server region or the popularity of the streaming service. We evaluate analytically the performance of the proposed algorithm, and compared with that of existing Qin's algorithm. Evaluation results show that our algorithm can achieve better streaming performance than Qin's algorithm. Therefore, the proposed algorithm not only improves the sharing availability of replicated streaming services but also controls efficiently the number of streaming service replications.

• 한국인터넷방송통신학회논문지
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• 제9권2호
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• pp.21-28
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• 2009

IPTV의 성공적인 서비스 제공을 위해서는 서비스의 품질을 최대한 보장할수 있어야 한다. 하지만 현재 제공되고 있는 IPTV는 고객이 채널 변경시의 채널 전환시간으로 인하여 고객의 만족도에 심각한 문제를 초래할수 있다. 또한 제한된 대역폭으로 인하여 서비스를 효율적으로 제공할수 없는 문제가 발생한다. 본 논문은 IPTV서비스의 멀티케스트 그룹에 포함된 모든 사용자의 채널 정보를 엑세스 망에 연결된 진보된 라우터에서 통계적으로 채널 우선순위 관리 및 대역폭 제어기능을 통하여 셋탑박스에게 채널정보를 빠르게 전송해 줌으로서 고객이 채널 Rating 서버에 기반한 예상 채널 정보를 현재 망의 대역폭을 감안하여 고속으로 제공 할수 있는 방법에 대해서 기술한다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.188-191
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• 1997

In this paper, we present a real-time remote patient monitoring service through world-wide web, which allows the medical doctor to monitor his patients in remote sites using popular web browsers. The real-time service consists of two services: Patient Locator Service (PLS) and Vital Sign Monitoring Service (VSMS). The PLS provides the information of patients currently being monitored. The VSMS allows the user to observe a stream of vital sign data of a specific patient. The vital sign data include ECG, respiration, temperature, $SPO_2$, invasive blood pressure and non-invasive blood pressure.

• 의료법학
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• 제8권2호
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• pp.291-328
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• 2007

Under the present law, a medical corporation has the legalistic character of a noncommercial corporation and its commerciality is restricted by public service. In a recent precedent, however, a judgment has considered the service part in medical practice. The tendency of a precedent is that both commerciality of a medical institution and medical corporation are allowed to be pursued under fundamental order-observance. This change is found in china and india, which consider a medical service as national industry. In the case of ours, the now government demonstrate the industrialization or the market of medical service through promotion of commerciality of a medical corporation. This paper deal with the meaning of a medical corporation and the present condition of medical market under the present law and recommends a tendency of law policy through study of foreign's and our precedent for commerciality of medical advertisement and medical corporation.