• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.781-786
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• 2007

According to increase in supply of public rental housing, in connection with support plan of housing welfare from government, necessity of maintenance management is coming to be important. By analyzing characteristics of public rental housing and maintenance management system, this study grasped developmental possibility of a web based maintenance management system as well as a critical point for improvement of problem and elevation of efficiency about maintenance management process. As we present not only useful possibility of ubiquitous equipments utilizing IT like PDA but effectiveness by using, based on this result, we represent course of improvement to systematic development for user that complement the existing maintenance management system which is currently developed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.913-916
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• 2006

의료시스템은 모든 것이 병원 네트워크를 중심으로 의료 서비스가 제공되어 진다. 하지만 자연재해, 천재지변과 같은 갑작스런 환자 발생으로 인한 응급 이동 사항, 혹은 진료자의 외진 및 환자 방문시에는 일반 데스크탑 PC에서 이루어지는 상태의 의료 서비스가 아닌 휴대하기 간편하고 언제 어디서나 의료서비스를 받을 수 있는 Personal Digital Assistant (PDA)와 같은 휴대용 기기에서의 의료시스템이 필요하다. PDA는 휴대가 용이하며 유선 네트워크 시스템에 구애받지 않는 무선 모바일 장비로서 무선 통신이 가능한 곳이라면 언제 어디서라도 환자에 대한 의료 정보를 조회할 수 있다. 또한 PDA의 통신 기술로서 병원과의 실시간 통신이 가능하여 응급 환자에 대해 빠른 진료를 제공 할 수 있다. 이와 더불어 임베디드기기 프로세서의 발달로 인하여 연산처리 기술도 많은 향상을 가져왔고 이로 인하여 기존의 PDA에서의 문제였던 DICOM영상의 조회 및 처리속도에도 많은 향상을 가져왔다. 이에 본 연구에서는 의료영상 표준인 DICOM표준을 따르며 이동성이라는 장점을 통하여 언제 어디서나 손쉽게 진료자가 환자의 의료정보 및 의료 영상을 조회할 수 있도록 하는 PDA용 모바일 의료영상 조회 시스템을 PXA255 기반의 Embedded Linux 상에서 QT/C++을 사용하여 구현하였다.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.822-825
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• 2002

Geographic Information System(GIS) has become an essential tool for making efficient interaction with both natural and artificial envirionment. Currently, it is being used on an inteligent tool in many device like the personal digital assistant(PDA) and the cellular phone and so on. However, these devices show very low performance comparing to a personal computer(PC). These devices(PDA, celluar phone) posses a less powered device profile. The less powerful hardware make these devices in capable to handle GIS based large spacial data. In this paper, we propose a new concept of multi-tier GIS oriented architecture to improve the data transfer performance providing only the necessary information required by the user using semantic filter.

• 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 Society of Industrial Information Systems
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• v.14 no.3
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• pp.30-36
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• 2009

With the rapid progress of medical image information system, a variety of researches for the system that can read and decipher the medical images in anytime and anywhere have been studied. In this paper, we develop personal digital assistant (PDA) device based mobile digital imaging and communications in medicine (DICOM) image viewer that can process the received medical images at any time. In particular, with the aid of the proposed mobile DICOM image viewer, we can read several images simultaneously and we can read the selected image only from the several images. To cope with the small size of PDA screen, the function of image enlargement is also included in the proposed mobile DICOM image viewer.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.41-43
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• 2005

PDA-based monitoring is used to acquire continuously the patient's vital signs, including electrocardiography, activity, heart rate and $SpO_2$. In this paper, A biomedical signal acquisition device was designed using 3-axial MEMS accelerometer and 1-ch ECG amplifier, to have the function of monitoring activity and electrocardiography. The proposed system is composed of transmitter and receiver. Through the Zigbee communication, subject's biosignals can be transmitted in real-time to receiver, and transmitted data confirmed using PDA. The packet size used in this device was set not to exceed a maximum payload size of 116 byte. One packet consists of two segments. The transmission speed was 21 packet per second, 420 ECG samples per second, and 42 acceleration samples per second. The proposed method can be used to develop Activities of Daily Living(ADL} monitoring devices for the elderly or movement impaired people and enables patients to be monitored without any constraints. Also, this method will reduce medical costs in the aged society.

• 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.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12C
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• pp.1225-1238
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• 2003

We present an efficient algorithm for skew correction of business card images obtained by a PDA (personal digital assistant) camera. The proposed method is composed of four parts: block adaptive binarization (BAB), stripe generation, skew angle calculation, and image rotation. In the BAB, an input image is binarized block by block so as to lessen the effect of irregular illumination and shadow over the input image. In the stripe generation, character string clusters are generated merging adjacent characters and their strings, and then only clusters useful for skew angle calculation are output as stripes. In the skew angle calculation, the direction angles of the stripes are calculated using their central moments and then the skew angle of the input image is determined averaging the direction angles. In the image rotation, the input image is rotated by the skew angle. Experimental results shows that the proposed method yields skew correction rates of about 93% for test images of several types of business cards acquired by a PDA under various surrounding conditions.

• The KIPS Transactions:PartD
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• v.13D no.1 s.104
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• pp.37-50
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• 2006

In the focusing on the important of wireless internet, mobile terminal device plays a central role in tracking and coordinating terms in mobile business processing. Especially, mobile device has been considered as a key technology for embedded software and ubiquitous era. Because existing web environments is moving to wireless internet, the new concepts for wireless internet computing environments has gained increasing interest. Mobile agents provide a new abstraction for deploying over the existing infrastructures. Mobile application systems require the flexibility, adaptability, extensibility, and autonomous. New software developments methodology is required to meet the requirements. In this paper, we present an agent architectures model that allows compassable components with pluggable and independable. Our approach involves wrapping components inside a servlet. We have used the model and components to develop the PDA mobile agent.

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.399-408
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• 2007

Dedicated Short Range Communications(DSRC) is a block of spectrum in the 5.8GHz band. DSRC is the useful technology of ITS Service. Japan operates ETCS, VICS by DSRC technology and DSRC technology is used ETCS Standard in Korea. There are many kind of utilization of DSRC in ITS. This is a study for traffic information service and collection with DSRC. Traffic management server service traffic information to driving vehicle by RSE(Road Side Equipment). OBU(Onboard Unit) in vehicle send the information to PDA(Personal Digital Assistant). Client S/W show the information to driver by text, pictogram, sound and return PDA H/W ID to OBU. Server make section traffic information by the PDA H/W ID information.