• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.421-423
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• 2003

이동전화, PDA(Personal Digital Assistant) 등과 같은 개인 이동 단말기 보급의 증가 추세와 더불어 무선 환경에서의 인터넷 접속에 대한 요구가 증가 하고 있다. Mobile IP(Internet Protocol)는 무선 환경에서의 인터넷 접속을 지원하고, 단말의 이동성을 보장 하는 기술이다. 현재의 Mobile IP에서는 핸드오프 시 패킷 데이터 유실이 발생 하고 이러한 패킷 데이터 유실 방지를 위하여 별도의 메커니즘 적용에 따른 시간 지연이 발생한다. 본 논문에서는 실시간 서비스에서의 IP 패킷 데이터 핸드오버 시 패킷 데이터 유실 방지와 패킷 데이터의 순서 뒤바뀜 방지를 위한 방법을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.151-153
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• 2002

Mobile handhold devices such as PDA(Personal Digital Assistant) and Cellular Phone are more and more popular for personal web surfing. But today, most mobile handheld devices have relatively poor web browsing capability because of the small bandwidth of wireless connection, the small speed of CPU, the small capacity of RAM and Flash ROM, the small display size of LCD and the short lifecycle of battery. Users have to endure bigger communication latency than Desk PC's one because of these factors. In this paper, we propose an effective pre-refresh mechanism for handheld device's embedded web browser so as to make user's web surfing faster. The experiment was done using the simulator designed by ourselves and the experiment result demonstrates the proposed mechanism has a good performance to make web surfing faster.

• Journal of Korea Multimedia Society
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• v.20 no.8
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• pp.1347-1356
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• 2017

Artificial intelligence-based services are expanding into a new industrial revolution. There is artificial intelligence technology applied in real life due to the development of big data and deep learning related technology. And data analysis and intelligent assistant services that integrate information from various fields have also been commercialized. Chatbot with interactive artificial intelligence provide shopping, news or information. Chatbot service, which has begun to be adopted by some public institutions, is now just a first step in the steps. This study summarizes the services and technical analysis of chatbot. and the direction of public administration service chatbot was presented.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.9
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• pp.4264-4279
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• 2017

In this paper, maximum likelihood-based automatic lexicon generation using mixed-syllables is proposed for unlimited vocabulary voice interface for East Asian languages (e.g. Korean, Chinese and Japanese) in AI-assistant based interaction with mobile devices. The conventional lexicon has two inevitable problems: 1) a tedious repetition of out-of-lexicon unit additions to the lexicon, and 2) the propagation of errors during a morpheme analysis and space segmentation. The proposed method provides an automatic framework to solve the above problems. The proposed method produces a level of overall accuracy similar to one of previous methods in the presence of one out-of-lexicon word in a sentence, but the proposed method provides superior results with the absolute improvements of 1.62%, 5.58%, and 10.09% in terms of word accuracy when the number of out-of-lexicon words in a sentence was two, three and four, respectively.

• Proceedings of the IEEK Conference
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• 2002.06c
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• pp.5-8
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• 2002

In this paper, we propose the self-autonomous algorithm for mobile robot system. The proposed mobile robot system controlled by Personal Digital Assistant(PDA) can follow the target at regular intervals. The mobile robot can evaluate the distance between robot and target with ultrasonic sensors, transmits the distance to the PDA. The velocity and direction decided in PDA are transmitted to the mobile robot with wireless LAN communication. Considering the state, velocity-changing and distance-maintenance, of the mobile robot, driving velocity and direction are applied. For safety, the velocity of the mobile robot is changed step by step. As a result, we confirm the ability of following the target with proposed mobile robot.

• Korean Journal of Construction Engineering and Management
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• v.14 no.4
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• pp.3-14
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• 2013

Recently, as the size of construction projects is getting bigger and higher, construction disasters have been being serious such as death, also it is hard to manage efficiently since there are plenty of informations about safety management. Thus on the spot & real time safety management is required and one of the ways to support these needs, conjunction with Information Technology(IT) has been being noticed. Accordingly, Personal Digital Assistant(PDA), Palmtop Computer and Tablet Personal Computer and so on have been adopted. However another inefficient sides are showed up such as limitation of equipment(weight, inconvenience of control and others). Meanwhile, exchanging and processing data are improved at wide area due to advance of mobile communication and introduction of smart mobile, which is a simple and convenient, is a proven at many aspects. In this research, to support effective safety management, the framework is realized in connection with smart mobile with finding the problems of safety management and deriving demands. Two smart mobile applications, which are Safety Management application and Safety Guideline application, enable that safety management in real time, less re-work and using safety information.

• Knowledge Management Research
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• v.6 no.1
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• pp.71-84
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• 2005

This paper is aimed at investigating the influence of the fit between PDA (Personal Digital Assistant) driven mobile technology and tasks on performance. Our research motive was adopted from the burgeoning mobile technology which can be easily observed in modem management. Fit theory has been widely applied to proved the relationship between technology and tasks. However, there are few studies about the fit between mobile technology and tasks. A the advent of the IT, mobile technology started to affect individuals' lifestyle as well as the management style of firms. For the purpose of proving those hypotheses, we collected 173 questionnaires from 20 firms such as manufacturing industry, financial business, service company, telecommunication company which deem using the PDA technology for their management. We applied factor analysis and path analysis for our experiments Results revealed that the mobile technology holds a statistically significant fit with tasks and Individual characteristics.

• Journal of information and communication convergence engineering
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• v.6 no.3
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• pp.348-352
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• 2008

In distributed computing paradigm, mobile surrogate systems migrates from on host in a network to another. However, Mobile surrogate system have not gained wide acceptance because of security concerns that have not been suitably addressed yet. In this paper, we propose a security framework based on Grid Proxy Gateway for mobile Grid service. The current Grid Security Infrastructure is extended to mobile computing environments. The surrogate host system designed for mobile Personal Digital Assistant (PDA) users can access the certified host and get his proxy credential to launch remote job submission securely.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.611-614
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• 2007

This paper suggests a TCP/IP-based remote data monitoring system, which combines PDA (Personal Digital Assistant) and WLAN (Wireless Local Area Network) technologies. Wireless PDA devices are used for remote monitoring of wireless communication by continuously collecting remote device data transmitted from servers such as temperature, humidity and device status, and displaying them on mobile devices. Therefore, remote data monitoring systems that integrate wireless and wired services provide data collection adaptive to administrators and efficient identification of device status.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.04a
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• pp.543-546
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• 2004

기존의 예약 시스템을 보게 되면 주로 뿔을 이용한 정보 검색 및 예약을 하는 일이 많았다. 하지만 요즘 들어서는 사용자들이 웹과 더불어 모바일 디바이스 즉, 핸드폰, PDA(Personal Digital Assistant), 스마트 폰 등의 사용률이 급격하게 증가하고 사회가 급변하게 돌아가기 때문에 언제 어디서든지 접할 수 있는 모바일 디바이스를 이용한 예약 시스템이 필요로 하게 된다. 그렇기 때문에 본 논문에서는 마이크로소프트 사의 닷넷 프레임워크 중에서 모바일 닷넷 프레임워크 또는 컴팩트 프레임워크를 기반으로 한 예약 시스템을 설계 및 구현 해보았다.