• 한국IT서비스학회:학술대회논문집
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• 2008.11a
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• pp.431-434
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• 2008

본 연구에서 우리는 웹 사이트들에서 제품에 대한 사용자들의 리뷰 정보를 수집하고, 수집한 정보들을 분석 및 정련하여 사용자들에게 보이는 서비스에 대해 논하고자 한다. 특정 제품에 대한 리뷰 정보들은 로봇 시스템에 의해 수집되고, 특정 제품에 대한 전체적인 평가 스코어는 두 가지 다른 종류의 스코어들을 고려하여 계산된다. 첫 번째 스코어는 정량적인 스코어(quantitative score)로 각 리뷰들로부터 얻어지는 이른바 별점 값들의 가중 평균값(weighted average)으로 계산된다. 두 번째 스코어는 정성적인 스코어(qualitative score)로, 본 연구에서 제안된 서비스는 각 리뷰들의 텍스트 설명을 자연 언어 처리 기법으로 분석하여 정성적 스코어를 계산한다. 우리는 이러한 스코어 계산 모델에 따라 MP3 플레이어와 Personal Digital Assistant (PDA)에 대해 서비스 시스템 RELLENOS를 설계 및 구현하였다. RELLENOS는 69 개에 달하는 온라인 리뷰 사이트들에서 수집된 정보들을 토대로 정량적인 값과 정성적인 값을 계산하여 서비스를 성공적으로 수행하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1543-1546
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• 2002

인터넷 사용이 보편화됨에 따라 컴퓨터뿐만 아니라, 휴대폰이나 PDA(Personal Digital Assistant)를 이용한 인터넷 사용이 증가하고 있다. 다양한 학습방법의 개발과 제공은 사용자에게 알맞은 학습형태를 선택할 수 있는 폭을 더 넓혀줄 것이다. 모바일 학습은 이러한 요구 사항에 적합하고 시대적으로 필요하다. Web과 함께 모바일 인터넷 환경을 이용한 교육 컨텐츠 제공에 대한 요구가 증가하고 있다. 따라서 본 논문에서는 이러한 인터넷 환경에서 모바일을 이용한 교육용 컨텐츠를 J2ME기반으로 구현하였다.

• Journal of Korea Multimedia Society
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• v.11 no.12
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• pp.1758-1764
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• 2008

In this paper, we propose query restructure method which realizes not only to present the result from database in Web page but also to adapt user's browsing environments. Recently, wireless PDA (Personal Digital Assistant) and portable phone and terminals equipped with Web browser become very popular. Various browsers would be required to create the HTML which adapt to the user's browsing environment. We propose an adaptive data presentation system which is an extension of SQL which creates HTML pages dynamically adapting to the size of screen. In our proposed method, the three basic rules for the layout conversion are provided and applying these rules, an efficient layout conversion technique optimized to user environment is proposed. Moreover, we propose a standard for converting layouts and a layout optimization for adaptive conversion of layouts.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.2
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• pp.73-82
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• 2001

In this paper we propose an efficient authentication and key agreement protocol which has been designed specifically for use with low powered computationally weak equipment such as Cellular phone and PDA(Personal Digital Assistant). Imple-menting the protocol based on the Rabin cryptosystem provides the efficiency requirements for mobile communications including minimum number of passes and low computational lead. The paper outlines the new protocol, examines it s various aspects, and compares them to those representative authentication and key agreement protocols.

• Journal of the Korean Society of Radiology
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• v.1 no.2
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• pp.13-22
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• 2007

The purpose of this study was to survey a development of the wireless transmission system of medical images for ubiquitous medicine. There have been many changes in medical equipments and medical record medical treatment and medical record within hospital and PACS(Picture Archiving Communication System) which is picture management system for patients can be typical cases. It is difficult to use these automated medical systems unless they are within hospital and in case of rapid image reading in the emergency cases or in absence of doctor, it is difficult to perform it immediately. The present study implemented an image transmission system using CDMA connection so that images in the server can be viewed at any time and in any place. Remote wireless diagnosis based on medical images using PDA is applicable to medical areas that require mobility, and the use of PDA can be an ideal alternative for point of care. The use of PDA enables prompt and accurate access to digital medical images, which in turn reduces medical accidents and improves the quality of medical services through high productivity and efficiency of medical practitioners' works. It also enables quick response to patients' demands and high-quality medical services and, consequently, patients' high satisfaction.

• Journal of Mechanical Science and Technology
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• v.20 no.4
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• pp.455-466
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• 2006

This study was an attempt to control and monitor Computerized Numerical Controller (CNC) machines anywhere and anytime for the development of a ubiquitous machine (u-machine). With a Personal Digital Assistant (PDA) phone, the machine status and machining data of CNC machines can be monitored in wired and wireless environments, including the environments of IMT2000 and Wireless LAN. Moreover, CNC machines can be controlled anywhere and anytime. The concept of the anywhere-anytime controlling and monitoring of a manufacturing system was implemented in this study for the purpose of u-manufacturing and u-machines. In this concept, the communication between the CNC controller and the PDA phone was successfully performed anywhere and anytime for the real-time monitoring and control of CNC machines. In addition, the interface between the CNC controller and the developed application module was implemented by Object linking and embedding for Process Control (OPC) and shared CNC memory. For communication, the design of a server contents module within the target CNC was based on a TCP/IP. Furthermore, the client contents module within the PDA phone was designed with the aid of embedded c++ programming for mobile communication. For the interface, the monitoring data, such as the machine status, the machine running state, the name of the Numerical Control (NC) program, the alarm and the position of the stage axes, were acquired in real time from real machines with the aid of the OPC method and by sharing the CNC memory. The control data, such as the start, hold, emergency stop, reserved start and reserved stop, were also applied to the CNC domain of the real machine. CNC machines can therefore be controlled and monitored in real time, anywhere and anytime. Moreover, prompt notification from CNC machines to mobile phones, including cellular phones and PDA phones, can be automatically realized in emergencies.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.42 no.2 s.332
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• pp.31-40
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• 2005

The Multi-Threshold CMOS (MTCMOS) technology provides a solution to the high performance and low power design requirements of mobile computing applications. In this paper, we (i) motivate the post-mask-tooling performance enhancement technique combined with the MTCMOS leakage current suppression technology, and (ii) develop a practical MTCMOS ASIC design methodology which fine-tunes and integrates best-in-class techniques and commercially available tools to fix the new design issues related to the MTCMOS technology. Towards validating the proposed techniques, a Personal Digital Assistant (PDA) processor has been implemented using the methodology, and a 0.18um Process. The fabricated PDA processor operates at 333MHz which has been improved about $23\%$ at no additional cost of redesign and masks, and consumes about 2uW of standby mode leakage power which could have been three orders of magnitude larger if the MTCMOS technology was not applied.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.35T no.3
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• pp.53-60
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• 1998

In this paper, we proposed a set of ANSI-Korean character patterns for handwriting recognition that can be used as an input method of mobile computers like PDA (Personal Digital Assistant). In the case of bilinguals, two kinds of alphabets are written alternatively So the method of input character mode change must be provided, and this cause discomfort of writing. Our proposed written character patterns have some constraint but permit ANSI-Korean mixed writing without mode change keeping original form of alphabets and can be recognized with simple algorithm relatively. For ANSI character we analysis Graffiti and propose new writing pattern, which is more similar to original form. There are many researches about input method of unpacking Korean character and writing patterns. But they are not widely used because it's excessively contrary to original form of Korean characters. To show our proposed writing patterns usefulness, we studied the satisfaction and easiness of writing and the recognition rates. Writers are divided into two groups; PDA users, familiar to Graffiti, and others. The results satisfy usefulness in the both groups.

• Journal of Digital Contents Society
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• v.6 no.1
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• pp.55-62
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• 2005

In this paper, we propose the new technique to compute the optimal route by considering the direction of distribution vehicles and the location for delivery, developing the algorithm of the shortest route to approach the location as applying the gemetic algorithm. This approach makes it possible for us to find the best route even under itineraries which include many destinations. Lively studies are currently in progress on the development of vehicle navigation software, combining PDA GPS, and electronic maps. Many web-sites are providing a varier of services which use electronic maps. Popular among these services is one that computes the optimal route between two positions that a user inputs. This service of computing the optimal route plays an important role in distribution industries such as home-delivery. For the distribution system. the construction of a vehicle regulation system enables us to calculate and manipulate the optimal route for distribution vehicles, to enhance the efficiency in making use of vehicles and labor, and to reduce costs.

• Korean Journal of Construction Engineering and Management
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• v.11 no.2
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• pp.106-115
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• 2010

Recently, as the size of construction projects are getting bigger and higher, more effective managing methods are required in management areas such as duration reduction, cost reduction and quality management. In the current construction industry, conjunction with IT(Information Technology) is being noticed as a solution to support these needs. Various IT solutions such as Bar Code, Personal digital assistant(PDA), global positioning system(GPS), radio frequency identification(RFID) are being developed. In this research, among the various IT solutions, the Real Time Locating System(RTLS) which is acknowledged as a technology with high applicational potential is analyzed. Based on this analysis, a locating system to apply in construction sites is developed and validated. The locating system is developed to prevent construction disasters through real-time management of workers and equipment, which enables effective application in the area of construction safety management. Moreover, applications of the locating system in many different areas like construction material realtime monitoring, construction automation, construction quality management, maintenance management are expected.