• 컴퓨터교육학회논문지
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• 제13권5호
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• pp.81-90
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• 2010

클라우드 컴퓨팅은 공유 가능한 여러 자원들이 모여 가상화된 형태로 서비스를 제공하는 인터넷 기반의 컴퓨팅 패러다임이다. 이러한 클라우드 컴퓨팅 환경에서 무수한 자원들에 대한 상태 정보를 신속히 전달하기 위한 방법으로 가쉽 프로토콜이 주목받고 있다. 가쉽 프로토콜은 견고하고 확장적인 멀티캐스트를 제공하는 반면, 100%의 도달가능성을 만족하기 위해서는 여분의 중복 메시지를 요구한다는 문제점이 있다. 본 연구에서는 자원들의 상태정보를 효율적으로 전달하면서 발생하는 메시지 오버헤드를 줄이기 위해 그룹 기반의 가쉽 멀티캐스트 프로토콜(GGMP)을 제안한다. 또한, 제안한 프로토콜의 성능을 실험을 통해 검증하였다.

• 대한전자공학회논문지TC
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• 제43권8호
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• pp.77-83
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• 2006

본 논문에서는 무선 센서 네트워크에서 Directed Diffusion을 이용하여 데이터를 신뢰성 있게 전달하는 기법을 제안하였다. 각각의 노드는 자신의 이웃에 대한 정보만을 유지하고 있으나 Interest의 전파 과정을 이용하여 종단간의 전달 신뢰성을 계산함으로써 도달가능성이 높은 경로를 선택하여 전송하는 메커니즘이다. 링크의 에러율과 노드의 개수 변화에 따른 실험을 통하여 제안 방식이 데이터 전달 신뢰성을 향상시킨다는 사실을 확인하였다. 또한, 부가적인 효과로서 트래픽 부하가 분산되고 에너지 소비가 감소되어 네트워크 수명이 연장됨을 알 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권12호
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• pp.5729-5744
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• 2017

Vehicular Ad Hoc Networks (VANET) in the large-scale road section usually have typical characteristics of large number of vehicles and unevenly distribution over geographic spaces. These two inherent characteristics lead to the unsatisfactory performance of VANETs. This poor performance is mainly due to fragile communication link and low dissemination efficiency. We propose a novel routing mechanism to address the issue in the paper, which includes a competition-based routing discovery with priority metrics and a local routing repair strategy. In the routing discovery stage, the algorithm uses adaptive scheme to select a stable route by the priorities of routing metrics, which are the length of each hop, as well as the residual lifetime of each link. Comparisons of different ratios over link length and link stability further show outstanding improvements. In the routing repair process, upstream and downstream nodes also compete for the right to establish repair process and to remain as a member of the active route after repair. Our simulation results confirm the improved performance of the proposed algorithm.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.176-183
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• 2003

This paper presents a neural network based approach to disseminating information relating to experimental and field observations in engineering. Although the methodology is generic and can be applied to many areas of engineering science, attention is focussed here solely on geotechnical engineering applications. Field data relating to the settlement of foundations presented by Burland and Burbidge (1985) which led to their well known equation for calculation of settlement, now included in most text books, is re-visited. A part of the data, chosen randomly, is used to train an Artificial Neural Network (ANN), which relates foundation settlement to various causes as identified by the authors. Predictions are made for situations for which data were not used in training. These indicate sufficient accuracy when compared to the original field data. Accuracy of predictions is further improved when all the data are included in the training set. The finally trained ANN is shown to represent these data more accurately than the Burland and Burbidge equation. Based on the above heuristic example, an ANN is presented as an alternative to developing equations and design rules in geotechnical engineering practice. Significant advantages are shown to arise by using this methodology. Ease of updating the ANN, as and when additional data becomes available, being the most important one. Loss of transparency, however, seems to be the main disadvantage.

• 융합정보논문지
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• 제7권3호
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• pp.165-171
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• 2017

최근 스마트 기기들의 개발과 연동된 네트워크는 사물인터넷의 보급과 함께 사용자 편익 우선에 많은 기여를 하고 있다. 특히, 사물인터넷은 스마트 홈 뿐만 아니라 스마트 기기를 이용한 모든 분야에서 활발하게 진행되고 있다. 본 논문에서는 스마트 기기 및 사물인터넷 기기들의 활용으로 혁신적이고 실용적인 지능형 커피숍 관리 시스템을 설계하였다. 본 시스템은 키오스크 주문뿐만 아니라 스마트폰 주문이 가능하며 비콘 기반의 사용자 자동 인식 기능도 제공한다. 그리고 지오 펜스를 이용한 사용자 위치 정보를 파악하여 기다림 없는 주문 제작이 가능하도록 하였다. 본 논문에서는 최종적으로 빅데이터 기반 날씨, 용도, 시간, 사용자 기반 추천 서비스도 제공하도록 하였다. 따라서, 본 시스템은 기존의 커피숍에 비해 비용 절감과 업무의 효율성이 증대되었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권6호
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• pp.2078-2094
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• 2015

Now a days, Efficient processing of Broadcast Queries is of critical importance with the ever-increasing deployment and use of mobile technologies. BQs have certain unique characteristics that the traditional spatial query processing in centralized databases does not address. In novel query processing technique, by maintaining high scalability and accuracy, latency is reduced considerably in answering BQs. Novel approach is based on peer-to-peer sharing, which enables us to process queries without delay at a mobile host by using query results cached in its neighboring mobile peers. We design and evaluate cooperative caching techniques to efficiently support data access in ad hoc networks. We first propose two schemes: Cache Data, which caches the data, and Cache Path, which caches the data path. After analyzing the performance of those two schemes, we propose a hybrid approach (Hybrid Cache), which can further improve the performance by taking advantage of Cache Data and Cache Path while avoiding their weaknesses. Cache replacement policies are also studied to further improve the performance. Simulation results show that the proposed schemes can significantly reduce the query delay and message complexity when compared to other caching schemes.

• Journal of Contemporary Eastern Asia
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• 제14권2호
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• pp.5-15
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• 2015

A growing number of studies have examined the relevance and impact of social media in building organizational resilience, which the ability to recover from a crisis, in the field of emergency management. However, few studies have assessed how these emergency response organizations perceive their own use of social media in crisis situations. In attempting to fill this gap, this study conducted a structured survey with emergency-response organization representatives in Seoul, South Korea, to examine how such organizations evaluate their utilization of social media in an urban emergency situation and how their social media uses are related to promoting organizational resilience during adverse events such as a flood. Overall, the findings imply that organizations are not yet taking full advantage of social media. Respondent evaluations of their own social media use in all three assessment areas-information provision, information dissemination, and emotional messages-were not satisfactory. However, their perceptions of how well they utilize social media were positively related to how they view their organizational resilience. Therefore, it may be that these organizations realize the powerful role of social media in building organizational resilience but lack the knowledge and experience to make the best use of social media services.

• 통상정보연구
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• 제10권1호
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• pp.193-214
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• 2008

This study aims to examine similarities and differences of each e-B/L types as well as identify problems of e-B/L utilization and directions for improvement. Especially, it suggests strategies for the realization of e-B/L through reviewing and analyzing commercial types of e-B/L, which have been developed so far. Although e-B/L succeeded in realizing the function as a certificate of title and its distribution value, it has not been fully implemented due to operational problems. Subsequently, e-B/L was realized in the Bolero project as an attempt of system to make up for shortcomings in the failure of previous e-B/L types, but it has still a number of problems. To solve this problem and make use of e-B/L more efficiently, this study focuses on the specific ways to introduce e-B/L and suggest directions for the development of e-Nego system. Preparation of electronic documents is a prerequisite for the development of the e-Nego system, taking distribution of electronic documents into consideration. Next, compatibility of electronic documentation and paper-based documents should be realized, with the guarantee of authenticity of electronic documents.

• 디지털산업정보학회논문지
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• 제13권3호
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• pp.149-165
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• 2017

This study is to discover and substantiate the casual relation between Learning Organization and Organizational Citizenship Behavior, with Supervisor Trust used as moderating variable. Learning Organization and Organization Citizenship Behavior are used, respectively, as independent and dependent variable, Supervisor Trust as moderating variable. The data for this study was collected from 340 public officials who participated in the training program. Data collection tools were used to collect structured questionnaire questionnaires, and dissemination and retrieval of questionnaires were carried out over 6 weeks from February 6 to March 10, 2017. Of the questionnaire distributed, the questionnaire was finally recovered from the questionnaire, with a recall rate of 91.8 %, showing a very high rate of recall. The result showed that Learning Organization is a significant factor for Organization Citizenship Behavior and also that Supervisor Trust plays a role in the control of the relationship between Learning Organization and Organization Citizenship Behavior; thus, in order for Public Organizations to achieve advanced competitiveness, vitalizations of Learning Organization is important.

• 가족자원경영과 정책
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• 제12권3호
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• pp.45-58
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• 2008

The purpose of this study is to determine how the culture of modern mass consumption is understood in determining a decent lifestyle. This study examined a variety of literature on this problem. The important results are as follows. The culture of consumption has evolved through the increase of productivity in modern industry. People's desires have instigated a developing consumption culture: the concepts of advertising, fashion, over-consumption, and conspicuous consumption. The dissemination of this new consumption culture in an information-rich society, facilitated by the popularization of the Internet, has started to influence every nook and comer of our lives. This change of lifestyle has resulted not only in positive effects, but also in negative ones, such as distortion of information, and inequality. Thus the culture of modern mass consumption has created a new concept of class order and has reinforced the unbalance between opinion-leaders and opinion-followers. It has also increased the ratio of needs to wants. Consumption makes escape and sensual pleasure possible. The conclusion of this study is that the culture of modern mass consumption has not upheld its original purpose, that is, the qualitative enrichment of life through consumption. It has only caused the disintegration of individuality.