• Annual Conference of KIPS
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• 2000.10b
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• pp.1087-1090
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• 2000

현재의 이동통신망에서 인터넷 서비스를 제공할 수 있도록 하기 위하여 Phone.com 사에서는 HDTP(Handhold Device Transport Protocol)와 HDML(Handheld Device Markup Language)을 개발하고, Nokia 사에서는 TTML(Tagged Text Mark-up Language)를 개발하였다. 이에 따라 업체마다 각기 나름의 기술을 개발하게 되어 서로 호환되지 않는 문제가 발생했다. 이에 1997년 6월에 WAP 포럼이 결성되어, 현재 전세계 700여개 업체가 참여하고 있다. 본고에서는 WAP 포럼을 중심으로 한 기술개발 및 표준화 현황을 조사 분석하였다.

• Current Optics and Photonics
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• v.1 no.6
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• pp.642-648
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• 2017

Involuntary hand tremor has been a serious challenge in micromanipulation tasks and thus draws a significant amount of attention from related fields. To minimize the effect of the hand tremor, a variety of mechanically assistive solutions have been proposed. However, approaches increasing human awareness of their own hand tremor have not been extensively studied. In this paper, a head mount display based virtual reality (VR) system to increase human self-awareness of hand tremor is proposed. It shows a user a virtual image of a handheld device with emphasized hand tremor information. Provided with this emphasized tremor information, we hypothesize that subjects will control their hand tremor more effectively. Two methods of emphasizing hand tremor information are demonstrated: (1) direct amplification of tremor and (2) magnification of virtual object, in comparison to the controlled condition without emphasized tremor information. A human-subject study with twelve trials was conducted, with four healthy participants who performed a task of holding a handheld gripper device in a specific direction. The results showed that the proposed methods achieved a reduced level of hand tremor compared with the control condition.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.477-479
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• 1999

인터넷 환경이 예전의 데스크 탑(Desktop)과 같은 고정적인 환경에서 PDA나 Handheld PC와 같은 작은 휴대단말기(Mobile device: 이동전화, PDA, Handheld PC)를 사용하는 유동적인 환경으로 변하고 있다. 물론 이런 작은 휴대단말기는 기존의 데스크 탑(Desktop) 컴퓨터와는 다른 환경을 가지고 있다. 여기서 다른 환경이라는 것은 작은 메모리, 느린 CPU 속도, 느리며 불안정한 통신상태, 화면의 작고 색상의 단조로움 등을 가리킨다. 그러나 휴대단말기는 이동성이라는 장점을 가지고 있기 때문에 그 보급이 기하급수적으로 늘어난 전망이다. 그러나 기존의 인터넷 정보를 표현하는 HTML 문서를 수용함에 있어서 휴대단말기는 앞서 말한 여러 가지 제약점을 가지고 있기 때문에 휴대단말기의 환경에 적합한 Markup 언어가 필요하다. 이에 현재 WAP Forum이라는 단체에서 WML(Wireless Markup Language)을 표준으로 정하기 위한 활동을 하고 있다. 본 논문에서는 휴대단말기로 기존의 인터넷에 접속하기 위한 환경에 대해 고찰하고 HTML을 WML로 변환하는 도구의 구현을 다루고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.481-483
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• 2000

PCS, Digital Cellular, CDPD, 그리고 Handheld PC와 같은 휴대단말기를 사용해 각종 정보망의 서비스를 받으려면 움직임이 점차 커지고 있다. 이에 발 맞추어 일반 이동단말기에서 인터넷을 접속 할 수 있는 여러 기술들이 개발되었으며, 현재 사용하는 것으로 Unwired Planet 사가 개발한 HDML(Handheld Device Markup Language)기술이 있고, WAP Forum에서 제시한 WAP(Wireless Markup Language)가 있다. WAP의 구조에서 가장 핵심적인 요소로서 WAP Gateway가 있으며, 현재까지 WAP Gateway에 대한 특별한 표준화가 이루어지지 않은 단계에서 각 컨텐츠 사업자가 WAP Gateway를 나름대로 구현하고 사용하는 실정이다. 본고는 보다 확장성을 가지고 무선이라는 환경에 적합하도록 서비스를 개선할 수 있는 WAP Gateway의 설계 및 구현 이슈에 대하여 다룬다.

• 한국HCI학회:학술대회논문집
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• 2008.02c
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• pp.30-35
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• 2008

This paper summarizes research results on the perceptual characteristics of mobile device vibrations carried out in the Haptics and Virtual Reality Laboratory at POSTECH, as a companion paper for the presentation to be offered in the haptics workshop of Korea HCI 2008. The physical characteristics, the absolute detection thresholds, and the perceived magnitudes of mobile device vibrations are briefly summarized, followed introduction to perceptually transparent vibration rendering.

• Proceedings of the KAIS Fall Conference
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• 2006.11a
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• pp.305-308
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• 2006

본 논문에서는 유비쿼터스 기술 기반에서 음악감상요법을 통한 청소년의 정서함양 방안을 연구하였다. 이를 위해 학교 홈페이지를 통한 Blended Learning 적용과 Smart Handheld Device 사용의 Mobile Learning 환경구축, 그리고 USN(Ubiquitous Sensor Network) 기술 기반에서 U-Healthcare 개념의 맞춤형 감상교육을 제안한다.

• Journal of Cardiovascular Imaging
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• v.30 no.1
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• pp.25-34
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• 2022

BACKGROUND: The purpose of this study was to assess the utility of a handheld device (HH) used during common daily practice and its agreement with the results of a standard echocardiography study (STD) performed by experienced sonographers and echocardiographer. METHODS: A prospective follow-up was conducted in an adult outpatient echocardiography clinic. Experienced sonographers performed the STD and an experienced echocardiographer performed the HH. STD included 2-dimensional images, Doppler and hemodynamics analysis. Hemodynamic assessment was not performed with the HH device because the HH does not include such technology. The images were interpreted by blinded echocardiographers, and the agreement between the reports was analyzed. RESULTS: A total of 108 patients were included; and the concordance for left ventricle (LV) ejection fraction (EF), wall motion score index, LV and right ventricle (RV) function, RV size, and mitral and aortic stenosis was excellent with κ values greater than 0.80. Wall motion abnormalities had good concordance (κ value 0.78). The agreement for LV hypertrophy, mitral and aortic regurgitation was moderate, and tricuspid and pulmonary regurgitation agreements were low (κ values of 0.26 and 0.25, respectively). CONCLUSIONS: In a daily practice scenario with experienced hands, HH demonstrated good correlation for most echocardiography indications, such as ventricular size and function assessment and stenosis valve lesion analyses.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.51
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• pp.139-149
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• 1999

Developed in this paper is a prototype extranet using mobile device such as Personal Digital Assistance(PDA) or Handheld PC(HPC). Especially an adjustment transaction system for auto insurance using wireless data communications is described. Using infrastructures such as PCS, Cellular, Private Radio, wireless communications offers tremendous applications in Korea. A survey of such applications is presented in this paper. Also an analysis of currently available infrastructures of wireless communications is described in this paper. The scheme of an adjustment transaction consists of seven steps: (1) get list of adjustment, (2) obtain insurance information, (3) check police record, (4) get an accident record, (5) get bluebook value, (6) examine the car, (7) file report. Comparing with the previous on-line method that spends much time on gathering data, the proposed system guarantees more rapid transaction using wireless communications.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.543-551
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• 2011

Recently various handheld multimedia devices are spreading, and users want to share media contents across their own multiple devices. Conventional synchronization techniques for N-screen services can continuously play contents by switching from an initial device to a new device. In this case, even if a new device plays continuously contents, the initial device stops playing them. In this paper, we propose a synchronization technique in which multiple devices can share and continuously play same contents simultaneously by gathering and passing URI and current play-time of the contents. The proposed synchronization technique is built on UPnP and DLNA, and tested by implementing a wireless home media network system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.2
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• pp.566-579
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• 2012

Ubiquitous computing called pervasive one is based on the thought of pervading ability of computation in daily life applications. In other words, it aims to include computation in devices such as electronic equipment and automobiles. This has led to disengagement of computers from desktop form. Accordingly, the notice in ubiquitous computing being taken of a world steeped in remote and wireless computer-based-services. Handheld and wearable programmed devices such as sense and control appliances are such devices. This advancement is rapidly moving domestic tasks and life from device-and-human communication to the device-and-device model. This model called Machine to Machine (M2M) has led to acceleration of developments in sciences such as nano-science, bio-science, and information science. As a result, M2M led to appearance of applications in various fields such as, environment monitoring, agricultural, health care, logistics, and business. Since it is envisaged that M2M communications will play a big role in the future in all wireless applications and will be emerged as a progressive linkage for next-generation communications, this paper aims to consider how much M2M architectures can realize ubiquitous computing in daily life applications. This is carried out after acquainting and initiating readers with M2M architectures and arguments for M2M. Some of the applications was not achievable before but are becoming viable owing to emergence of M2M communications.