• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.956-961
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• 2009

When construction engineers perform their work in the jobsite, they have to record as-built conditions in the project log (Data Collection). On the other hand, the engineers often have to refer to the construction documents when necessary at the job faces (Data Access). The practice of Data Collection and Data Access in the jobsite can be greatly enhanced by utilizing mobile computing with wireless communications. In this paper, two cases of mobile computing applications for construction field management are presented; Mobile Specifications System and Mobile Data Collection System. The demonstration of the process for developing two mobile applications is the primary purpose of the paper. The problems and issues involved with adopting mobile computing for construction field are also presented. The simple information framework for mobile computing has been also proposed as an outcome of the research. As for development tools, readily available relational database and wireless network have been used. The use of commercial mobile broadband was examined for data communication where local area network is not available.

• 대한환경공학회지
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• 제36권8호
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• pp.570-578
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• 2014

수심이 낮은 하구에서 바람이 국부적인 해수면 상승/하강에 미치는 영향을 연구하기 위해 Mobile Bay에 3차원 해수 순환모델을 적용하였다. Mobile Bay의 남단 경계면, 즉 northern Gulf of Mexico에서 시작된 조위는 Mobile River system 북부까지 직접적인 영향을 준다. 그러나 Mobile Bay 남단에서 발생한 조위변화는 Mobile Bay 북부로 이동하면서 Mobile River system으로부터 들어오는 담수와 국부적 바람의 영향으로 왜곡된다. Mobile Bay 남단에 위치한 기상관측소에서의 바람정보를 Mobile Bay 전체에 적용하였을 경우 Mobile Bay 북부에서 실제보다 강한 바람의 영향으로 과대한 수위 상승과 하강 현상이 발생하였다. 그러나 Mobile Bay 남단과 중단에 위치한 두 개의 관측소에서 측정된 바람 정보를 활용하였을 경우 Mobile Bay 북부에서의 조위 변화를 보다 정확하게 재현하는 것으로 나타났다. 특히 바람의 강도가 센 경우 Mobile Bay 남단과 북단의 풍속이 현저하게 차이나는 것으로 나타났으며(~ 88%), 이는 Mobile Bay 북단에서 나무와 건물 등의 영향으로 바람의 강도가 급격하게 줄어들었기 때문으로 판단된다. 따라서 Mobile Bay와 같이 수심이 낮고 국부적으로 풍속이 다른 하구 또는 만에서의 수위변화 재현 또는 예측을 위해서는 국부적인 바람 정보가 매우 중요한 것으로 연구되었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3972-3985
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• 2016

Organizations have been implementing mobile applications that actually connect to their backend enterprise applications (e.g. ERP, SCM, etc.) in order to increase the enterprise mobility. However, most of the organizations are still struggling to fully satisfy their mobile application users with the enterprise mobility. Even though it has been regarded as the right direction that the traditional enterprise system should move on, the studies on the success model for mobile enterprise applications in user's acceptance perspective can hardly be found. Thus, this study focused not only to redefine the success of the mobile enterprise application in user's acceptance persepective, but also to find the impacts of the factors on user's usage behavior of the mobile enterprise applications. In order to achieve this, we adopted the Technology Acceptance Model 2 (TAM2) as a model to figure out the user's behavior on mobile applications. Among various mobile enterprise applications, this study chose mobile ERP since it is the most representing enterprise applications that many organizations have implemented in their backend. This study found that not all the constructs defined by Davis in TAM2 have a significant influence on user's behavior of the mobile-ERP applications. However, it is also found that most social influence processes of TAM2 influence user's perception of the degree of interaction by mobile-ERP applications.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2001년도 The Pacific Aisan Confrence On Intelligent Systems 2001
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• pp.179-185
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• 2001

Mobile agents have the unique ability to transport themselves from one system in a network to another. The ability to travel allows mobile agents to move to a system that contains services with which they want to interact and then to take advantage of being in the same host or network as the service. But most of conventional mobile agent systems require that the users or the programmer should give the mobile agent its detail behavioral script for accomplishing the given task. And during its runtime, such mobile agents just behave according to the fixed script given by its user. Therefore it is impossible that conventional mobile agents autonomously build their own plants and execute them in considering their ultimate goals and the dynamic world states. One way to overcome such limitations of conventional mobile agent systems is to develop an intelligent mobile agent system embedding a reactive planner. In this paper, we design both a model of agent mobility and a model of inter-agent communication based upon the representative reactive planning agent architecture called JAM. An then we develop an intelligent mobile agent system with reactive planning capability, IMAS, by implementing additional basic actions for agent moves and inter-agent communication within JAM according to the predefined models. Unlike conventional mobile agents. IMAS agents can be able to adapt their behaviors to the dynamic changes of their environments as well as build their own plans autonomously. Thus IMAS agents can show higher flexibility and robustness than the conventional ones.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 춘계종합학술대회
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• pp.241-244
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• 2003

최근 IETF mobileip 워킹 그룹은 Mobile IPv6의 보안 문제를 가장 중요하게 다루고 있고, 홈 에이전트와 이동 노드는 IPsec을 적용하여 인터넷 보안을 제공하고, 상대 노드와 이동 노드는 RR과정으로 서로를 인증 할 수 있는 표준안을 제출하였다. 이동 노드는 자신의 흠 주소를 획득하여 인터넷 연결의 이동성을 보장받기 위하여 특정 라우터에게 홈 에이전트를 등록하고 흠 에이전트와 이동 노드는 IPsec 적용을 위한 보안 연계 정보를 교환할 수 있어 IPsec 적용이 가능하다. 반면 상대 노드와 이동 노드와 IPsec을 적응하기 위해서는 이동 단말기의 한계 및 IPsec 프로세싱의 부하로 RR과정을 통하여 상호 인증하는 메커니즘을 채택하였다. 본 고는 Mobile IPv6 환경에서 홈 에이전트와 이동노드사이에 IPsec 적용 방안을 위한 보안 연계 및 보안 정책 관리 방향을 제시한다.

• 경영과학
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• 제23권3호
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• pp.27-39
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• 2006

Designing mobile Interfaces is fundamentally different from designing online interfaces. Not only are there differences in underlying technologies, but also in the way people use mobile Interfaces. If these differences are not taken into account in designing mobile interfaces, mobile services are likely to fail. If mobile services do not deliver what people want, these services will fail no matter how excellent the underlying technology is. The user interface design commonly used in mobile services is based on multi-layered approach, which is not very user-friendly. A well designed single layered user Interface will be more user friendly than the conventional one and it will be having edge over others. However, it is quite difficult to Provide a single layered user Interface in a small screen. This study aims at examining how design attributes of mobile interfaces affect customer preferences. In order to explore customer preferences to each design attribute of mobile interfaces, we measure and analyze customer's WTP (Willingness To Pay) toward their different interface designs. Ultimately, throughout the study, we try to answer how to design mobile interfaces in small screen of mobile devices. In addition, we propose an optimal design solution that customers likely prefer.

• 패션비즈니스
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• 제21권3호
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• pp.67-79
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• 2017

This study investigated consumers' enjoyment, perceived risks, expected values, and innovativeness factors and the effects of the convenience and personalization of "online to offline" (O2O) fashion mobile commerce on its perceived usefulness, perceived ease of use, and consumers' attitudes and intention to use O2O mobile commerce. A research model was developed using the Technology Acceptance Model (TAM). A mobile survey was conducted through smartphone messengers and SNSs targeting male and female college students in their 20s who are living in the Seoul Metropolitan Area. A total of 192 questionnaire responses were used in the analysis. "Among the consumer characteristics, only enjoyment and expected values were found to make consumers feel that the O2O fashion mobile commerce is useful and easy to use. Among the mobile commerce characteristics, only convenience was found to have significant effects on consumers' perceived usefulness and ease of use regarding O2O fashion mobile commerce. Perceived usefulness was found to have the effects on attitudes as well as intention to use toward O2O mobile commerce. It was shown that positive attitudes toward O2O mobile commerce led to positive use intention toward O2O mobile commerce.

• 지식경영연구
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• 제15권3호
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• pp.13-36
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• 2014

Recently, with the increasing popularity of smartphones, mobile applications have been being used in various sectors. In these environments, some mobile applications are being made for special purposes. The mobile campus application is one exemplary type of such special-purpose mobile applications, which have unique characteristics that allow only designated users, belonging to a specific group, to access and use relevant knowledge. The aim of this study is to identify and investigate critical success factors of mobile campus applications based on the DeLone & McLean's information systems (IS) success model and to find unique characteristics of mobile campus applications, compared to general-purpose mobile applications. In order to empirically test our research model, 199 samples were collected from students who actually had experience of using the mobile campus application of A university at least once. The findings of the structural equation modeling using SmartPLS 2.0 confirmed the DeLone & McLean's IS success model, with the exception for relationships between service quality and user satisfaction/intention to use. Moreover, the moderating role of sense of belonging to school on the relationships between quality-related factors (i.e., information, system, and service qualities) and success-related factors (i.e., user satisfaction and intention to use) was examined.

• 한국통신학회논문지
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• 제31권2A호
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• pp.97-102
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• 2006

본 논문에서는 Mobile IPv6에서 실시간 서비스를 효율적으로 지원할 수 있는 핸드오버 확장 기술을 제안한다. 제안된 방법은 핸드오버를 위해 미리 예약된 주소를 활용함으로써 기존의 FMIPv6와 같이 복잡한 절차를 가지지 않고도 Mobile IPv6에서의 핸드오버 지연을 상당히 줄일 수 있다. Mobile IPv6와 제안된 방법과의 핸드오버 지연 분석을 통하여 제안된 방법이 Mobile IPv6에 비하여 현재의 규격상으로도 최소 1초, 평균 3초 이상의 핸드오버 지연을 줄일 수 있음을 확인하였다. 따라서 제안된 방법은 이동 인터넷에서 VoIP와 같은 실시간 서비스에 대한 요구가 증가하고 있는 현재의 추세를 고려할 때 Mobile IPv6 기반의 이동 인터넷 환경에서 실시간 서비스를 제공하기 위한 유력한 기술로 고려될 수 있을 것이다.

• Journal of Communications and Networks
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• 제2권1호
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• pp.35-45
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• 2000

this paper presents the concept of "mobile ATM', a proposal for third-generation (3G) mobile communication network infrastructure capable of supporting flexible evolution of radio technologies from today's cellular and data services towards future wireless multimedia services. Mobile ATM provides generic mobility management and QoS-based transport capabilities suitable for integration of multiple radio access technologies including cellular voice. wireless data, and future broadband wireless services. The architecture of a mobile ATM network is outlined in terms of the newly-defined "W-UNI" interface at the radio link and "M-UNI"and "M-UNI" interface which supports unified access for WATM and non-ATM mobile terminals through corresponding interworking functions (IWF) is explained. leading to an understanding of how different radio access technologies are supported by the same ATM-based core network infrastructure. Generic mechanisms for handoff and location management within the core mobile network are discussed. and related protocol extensions over the "W-UNI" and "M-UNI/NNI"interfaces are proposed. the issue of "crossover switch (COS)" selection in mobile ATM is considered, and a unified handoff signaling syntax which supports flexibility in COS selection is described. Typical signaling sequences for call connection and handoff using the proposed protocols are outlined. Experimental results form a proof-of-concept mobile ATM network prototype are presented in conclusion.