• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.4
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• pp.380-386
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• 2003

As Internet is spreaded widely, the virtual communities among people with the same interest and hobby are dynamically created. The exchange of fruitful opinion and information makes them to be closed, not only with the help of the messaging system but also wireless terminals. The messaging system is a core technology supporting the global community services like chatting, messenger, short message services, and file sharing services. The paper focus on the design of software architecture for messaging system and the engineering model for QoS support.

• Journal of Distribution Science
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• v.11 no.11
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• pp.41-47
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• 2013

Purpose -This paper aims to understand how easy and convenient it is for consumers to use mobile services. A mobile service combines hardware and software with information technology. To specifically meet the needs of users of mobile applications, the context of usability was identified in consumer mobile services. Research Design, Data, and Methodology - For usability measurement and evaluation, appliances and software were the main target: this applied to an expanding range, such as a Personal Digital Assistant (PDA), mobile phones, and wired and wireless integrated services. This study extended the Technology Acceptance Model (TAM) by examining the roles of two characteristics of mobile applications'usage: usability and usefulness. Results - The study tested the research model using a structural equation modeling (SEM) technique. Results showed no significant differences between the two models. Usability comprised learnability, efficiency, memorability, errors, and satisfaction: the motivation for using a mobile application was understood as being the usefulness and easy-of-use of the mobile application. This empirical study validated the proposed research model and hypotheses, and found that the hypotheses could be supported. Finally, the phenomena derived from the causal relationships in usability were identified, and their implications considered.

• Journal of KIISE:Information Networking
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• v.33 no.5
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• pp.380-394
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• 2006

Traditional Internet services provide the same level of qualify to all users without considering about their application's QoS (quality of service) requirements. Because the wireless and Internet technologies are evolving rapidly, the powerful mobile devices are more widely used. Therefore, the new applications such as DMB (digital multimedia broadcasting), VoD (video on demand), telemedicine, and etc. demand appropriate QoS and host mobility. To satisfy free mobility and QoS, we deploy Diffserv (differentiated services) model to the mobile IPv6 networks. We propose the operational procedures and cost analyzing models for providing an MN's mobility and QoS. Also its performance is presented by cost analyzing and the future works are described.

• Journal of the Korea Society of Computer and Information
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• v.20 no.12
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• pp.53-59
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• 2015

In this paper, we developed a Hospital Information System in which the business process is formalized and a wire/wireless integrated solution is used. This system consists of the administration office program, the medical office program, the ward management program and the rounds management program. The administration office program can enroll and accept patients, issue and reissue the RFID card. The medical office program inputs a medical examination and treatment, outputs a diagnosis, requests a hospitalization, retrieves the record of a medical examination and treatment, assigns the corresponding examination room to the accepted patients, and updates the number of an waiting patient and a patient number according to the examination room on real time. The ward management program handles hospitalizations and leaving hospital, a nurse's note, and an isolation ward monitoring. The rounds management program handles a medical examination and treatment, and a leaving hospital using PDA. This developed system can be built at low cost and increase the quality of the medical services highly by making it automated the medical administration automation. Also the small number of the medical staffs can manage the inpatients efficiently by using the monitoring functions.

• KSCI Review
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• v.9 no.2
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• pp.19-38
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• 2002

21세기 산업 분야의 근간은 정보통신 산업이며 그 정보통신 기술의 두 축은 인터넷과 무선통신이다. 무선인터넷은 인터넷의 즉시성과 휴대전화와 개인정보단말기(PDA)의 이동성을 합한 개념으로 무선단말기를 통해 인터넷을 이용하거나 전자상거래를 할 수 있는 서비스이다. 무선인터넷은 사용자가 이동 중에도 무선망을 통해 인터넷에 접속, 원하는 서비스를 제공받을 수 있는 환경과 기술이라고 할 수 있다. 이처럼 무선인터넷의 핵심은 모바일 즉, 단순히 선이 없다는 의미가 아니라 이동중이라도 언제 어디서라도 인터넷에 접속이 가능하다는 것이다. 현재 국내 무선인터넷 시장은 각종 사업 제휴, 사업설명회, 세미나 등 무선인터넷과 관련해 활발히 움직이고 있고, 막대한 투자와 기술 개발 또한 지속적으로 진행되고 있다. 이처럼 이동통신사업자, 콘텐츠, 솔루션, 단말기 등의 거의 모든 사업자가 초기 시장 선점을 위한 경쟁이 치열하다. 무선인터넷은 이동통신과 인터넷 서비스의 결합으로 이동중에 무선으로 인터넷 정보를 송, 수신할 수 있는 서비스로서 이는 단순문자정보서비스(SMS)방식과 WAP 또는 ME 브라우저를 탑재한 무선인터넷 서비스 방식으로 구분할 수 있다. 무선인터넷은 차세대 이동통신(IMT-2000)과 접목되면서 기존 IT산업 자체를 전면 재편하게 될 것으로 전망되고있다. 하지만 무선인터넷 활성화를 위해서는 사업자들의 지속적인 기술 개발, 콘텐츠 개발, 요금 체계 개선 등도 중요하지만 정부의 정책적 배려와 무료에 익숙해져 있는 사용자들의 인식 변화 등 다양한 차원에서의 노력이 필요하다.

• Journal of Biomedical Engineering Research
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• v.30 no.3
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• pp.185-190
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• 2009

Biomedical mobile devices for ubiquitous healthcare consist of biomedical sensors and communication terminal. They have two types of configuration. One is the sensor-network type device using wired or wireless communication with intelligent sensors to acquire biomedical data. The other is the sensor embedded type device, where the data can be acquired directly by itself. There are many examples of sensor network type, such as, fall detection sensor, blood glucose sensor, and ECG sensors networked with commercial PDA phone and commercial phone terminal for ubiquitous healthcare. On the other hand, sensor embedded type mounts blood glucose sensor, accelerometer, and etc. on commercial phone. However, to enable true ubiquitous healthcare, motion sensing is essential, because users go around anywhere and their signals should be measured and monitored, when they are affected by the motion. Therefore, in this paper, two biomedical mobile devices with motion monitoring function were addressed. One is sensor-network type with motion monitoring function, which uses Zigbee communication to measure the ECG, PPG and acceleration. The other is sensor-embedded type with motion monitoring function, which also can measure the data and uses the built-in cellular phone network modem for remote connection. These devices are expected to be useful for ubiquitous healthcare in coming aged society in Korea.

• Journal of Korean Academy of Nursing Administration
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• v.18 no.1
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• pp.23-32
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• 2012

Purpose: The purpose of this study was to assess the clinical application of a bar code medication administration and blood transfusion system and to identify its effects from the aspect of patient safety and nurse satisfaction in a tertiary hospital. Methods: The system in this study was PDA with bar code reading capability and wireless networking function. The logs created during application of the system and administration error reports were analyzed. For nurses' satisfaction with the system, data were collected from 337 nurses using the instrument developed by Otieno et al. and analyzed using descriptive statistics. Results: The system application rate was 98.8%, and the main failure cases in the system application included bar code or network related factors. When the system was applied, 0.02% of errors were prevented. The nurses were satisfied with the system from the aspect of patient safety, however relatively less satisfied with the system from the aspect of work efficiency. Conclusion: The results of the study indicate the usefulness for patient safety of applying the bar code medication administration and blood transfusion system to clinical practice. However technological improvements including bar code and network communication are necessary to ensure higher work efficiency in nursing practice.

• Journal of KIISE:Computing Practices and Letters
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• v.11 no.2
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• pp.157-164
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• 2005

With the advances of wireless technologies and mobile computing, m-commerce is being realized on many kinds of mobile devices. Service contents for m-commerce are usually newly written to meet specific characteristics of user's mobile devices, thus requiring formidable efforts. So, it is very important to effectively exploit the Internet product information currently being provided for e-commerce. However, bringing those Internet contents to mobile devices is far from straightforward due to the limitations of mobile devices such as little memory, small displays, low processing speeds, and so forth. In this paper, assuming that the Internet products are represented in XML, we suggest four methods to construct the object hierarchy for effectively viewing the documents on the mobile devices. We then compare and analyze them by experiments in terms of response times and required memory size.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1057-1060
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• 2002

대부분의 전자상거래 시스템이 유선 인터넷과 HTML(Hypertext Markup Language)을 기반으로 하고 있다. 그러나, 무선 단말기의 대량 보급으로 무선 인터넷이 인터넷의 새로운 패러다임을 주도하고 있으며, 효율적인 전자상거래를 위하여 HTML기반의 시스템이 XML(eXtended Markup Language) 기반으로 대치되는 과정에 있다. 무선 인터넷은 이동전화나 PDA(Personal Digital Assistant) 등 소형 무선 단말기 상에서 인터넷을 이용할 수 있도록 해주는 프로토콜의 총칭으로 정의되는 WAP(Wireless Application Protocol)과 같은 규약을 이용하여 다양한 서비스를 시간 및 공간의 제약을 받지 않고 무선 장치를 통하여 제공한다. 그리고, XML은 정보나 자료를 처리하는 데 있어 공통의 표준을 적용시킬 수 있고, 이 기종 응용프로그램간의 상호 작용을 중대시키고, 조직간에 정보 공유를 향상시킬 수 있다. 본 논문에서는 이러한 WAP과 XML의 장점을 결합한 전자상거래 시스템을 소개한다. 제안된 시스템은 WAP을 이용하여 무선뿐만 아니라 유선으로 실시간 정보 공유를 가능하게 하였고, 기존 시스템에서의 데이터베이스 시스템을 XML데이터로 대체시킴으로 인하여 데이터 저장을 위한 시공간의 비용을 절감시켰다. 뿐만 아니라 XML데이터의 사용으로 메타데이터를 생성 및 가공할 수 있는 방법을 구현하였다.

• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.27-33
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• 2006

In the near future, we can access information which we want, whenever we want, wherever we use. Because almost devices in ubiquitous environment are connected by either wired or wireless network. Especially, u-Learning emphasizing on pedagogical property is enable to improve learning abilities. As researches of the previous u-Learning. there have been learning by mobile devices such like PDAs as well as the smart classroom, which makes the remote students participate in the existing class. However, these researches have not satisfied pedagogical, cooperative and ubiquitous properties yet. Thus we suggest the framework for both local and mobile classroom, which can make the properties easy to satisfy.