• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.493-496
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• 2007

As the ubiquitous society period has set in recently, which resulted from both mass distribution of portable devices such as PDA, PMP, Smart Phones, the demand for more optional features of system and multimedia functions has been increasing. In compliance with thoses needs, the amount of information increased in a system and greater power capacities are needed more than ever. Therefore, in portable device which uses battery as a limited source of power, the power management has become a key factor in the system. This paper concentrates on the Power management solution for Smart device for the prevention of missing child. And ARM9 Core was used as CPU and Windows CE 5.0 was ported to the smart device.

• Korean Journal of Digital Imaging in Medicine
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• v.17 no.1
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• pp.33-41
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• 2015

This study attempts to examine the clinical usefulness of High b-value DWI (diffusion weighted imaging) for brain tumors with an edema. Subjects were seven patients selected from 65 patients who received an MRI scan for suspected encephalopathy and confirmed diagnosis at our hospital from February to July 2015 (male: 7, average age : 66 years old). As test equipment, 3.0T MR System (ACHIEVA Release, Philips, Best, The Netherlands) and 8Channel SENSE Head Coill were used. DWI checks on the use of the variable TR 5460ms, TE 132ms, Slice Thickness 4mm, gap 1mm, Slice number 29 is, 3D T1WI is TR 8.4ms, TE 3.9ms, matrix size $240{\times}240$, Slice can set 180 piecesIt was. b value of 0, 1,000, 2,000 s/mm2 with DWI acquisition and 3D T1WI enhancement five minutes after the Slice Thickness 3mm, gap 0mm to reconstruct the upper face axis (MPR TRA CE) was. As for the experiment, in b-value 1,000 and 2,000 images, SNR and the lesion at the lesion site and CNR in the normal site opposite to the lesion are measured. WW(window width) and WL(window level) are made equal in MRICro software, and the volume of the lesion is measured from each of b-value and MPR TRA CE image. Using SPSS ver. 1.8.0.0 Mann Whitney-test was analyzed for SNR and CNR, while Kruskal-Wallis test was analyzed for volume.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.6
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• pp.1639-1646
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• 2008

This study designed and realized a new type of RFID middle-ware based on .NET Compact Framework platform using PXA255 embedded board and Windows CE as operating system. The proposed embedded RFID middle-ware system controls via LAN a number of RFID sensors using RS-232 as interface and was designed on the basis of components of each function necessary RFID middle-ware. Application module operating in the SOA environment analyzes the data received from the RFID sensors with the embedded RFID middle-ware and in turn performs appropriate business logic. Client module to be used by end users can use RFID information in database, by web method call of application.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2002.02a
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• pp.135-137
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• 2002

In the favor of adjusting microwave signal, Hairpin type Filter, which delay microwave signal enough to several nanosecond, is a key component. One of the main advantage in using Hairpin type Filter is a conveniency for equipping with Delay Module, and because of having a wide bandwidth, Hairpin type Filter can be designed to satisfy the most applications. In this work, we attempted to estimate the delay time in a superconductive hairpin type filter A software to synthesize even and odd order equiripple hairpin type filter has been developed. This software arbitrarily locate its transfer zeros making symmetric of asymmetric amplitude response and equalizing group delay. Borland C++ compiler has been used. The program was designed to run under MS-DOS, Window 98, Window 2000. The program optimizes the position of the transfer function zeros in order to fulfill the group delay specification masks. We designed and fabricated a hairpin type HTS 2-pole microstrip bandpass filter to operate at 5.8Ghz. The fabrication method was pulsed laser deposition and YBCO films were deposited on sapphire substrates with a Ce$O_{2}$ thin layer as a buffer layer. We also developed a new style hairpin type filter by using interdigitide inner-pole. Compared to the same size regular hairpin type filters, our filters had a lower center frequency.

• Proceedings of the IEEK Conference
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• 2004.08c
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• pp.681-685
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• 2004

Design of efficient Medium Access Control (MAC) protocols with both high throughput performances is a major focus in distributed contention-based MAC protocol research. In this paper, we propose an efficient contention-based MAC protocol for wireless Local Area Networks, namely, the Developed Collision Resolution (DCR) algorithm. This algorithm is developed based on the following innovative ideas: to speed up the collision resolution, we actively redistribute the backoff timers for all active nodes; to reduce the average number of idle slots, we use smaller contention window sizes for nodes with successful packet transmissions and reduce the backoff timers exponentially fast when a fixed number of consecutive idle slots are detected. We show that the proposed DCR algorithm provides high throughput performance and low latency in wireless LANs.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.37-40
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• 2001

본 논문에서는 PDA상에서 음성으로 명령어를 제어하기 위해 Window CE 3.0 환경에서 음성인식기를 설계하였다. 전처리과정에서 26차 특징파라미터를 추출하고, HTK를 통해 학습하였다. 트라이폰 기반의 가변어휘 음성인식기를 설계하였으며, PDA의 응용프로그램은 Embedded Visual C++언어를 사용하여 22개의 음성명령어를 제어하도록 하였다. 그 결과 PDA상에서 $92\%의 인식률이 나타났으며 이것은 음성인식이 모바일 환경에서도 접근이 가능함을 알 수 있었다.

• International Commerce and Information Review
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• v.3 no.2
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• pp.177-192
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• 2001

전자상거래의 탄생과 성장의 가장 큰 당위성은 고객의 만족도 제고와 효용성의 증대라 할 수 있다. 이러한 측면에서 살펴볼 때, 이동성, 위치성, 접근성 및 개인성을 고루 갖춘 M-Commerce에 대한 수요는 매우 폭발적일 것으로 판단된다. 그럼에도 불구하고 기존의 유선 인터넷 망을 이용하는 전자상거래에 비해 기술 규격이 표준화되지 못하고 있는 점, 보안 및 인중이 취약하다는 점, 불편한 인터페이스 등의 문제로 아직까지는 대중화되지 못하는 태동기라고 볼 수 있다. 현재, M-Commerce의 주요 수단으로 사용되는 Cellular Phone과 PCS의 차기 모델로서 대두되고 있는 IMT 2000과 기존의 단말기를 대체하는 PDA 사용자의 급증 동 제반 불만족 요인의 상당 부분을 극복 할 수 있을 것으로 판단된다. 또한, M-Commerce의 Business Model은 기존은 기존의 전자상거래가 B2B 시장이 가장 폭넓은 시장인데 비해 B2C 시장으로 특화될 수 있을 것으로 전망된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11c
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• pp.1827-1830
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• 2003

무선 단말기 기반 기술의 발달에 따라 많은 이용자들이 있고, 일반 PC 에서만 사용되던 기술들을 무선의 시간 공간 제약이 없는 작업환경에서 이용하고자 하는 욕구의 증가로 점차 확산되고 있다. 이에 발 맞추어 2003 년 중반 4 개 은행이 PC 에서 사용되던 인터넷 뱅킹을 무선 단말기를 이용하는 서비스로 확장 시행하였다 현재 단말기는 PPC(Pocket PC)와 Palm, 사용되는 운영체제로는 Window CE 와 Palm 을 운영체제로 하는 기기에서 서비스를 제공하고 있어, 위의 단말기를 제외한 이 기종에서 서비스 사용이 어렵다. 더 많은 사용자들의 사용을 위해서는 다양한 단말기에서의 사용이 가능하여야 하기 때문에 이 논문에서는 Linux를 OS로 하는 단말기에서의 WPKI인증 기술을 구현한다.

• Journal of Biomedical Engineering Research
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• v.25 no.1
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• pp.21-26
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• 2004

Recently, many people want to know their state of health, such as a body fat rate, anywhere and anytime. The Personal Digital Assistance(PDA) is the portable wireless apparatus that has become widely popular. There are many application areas of the IDA to be in mobile care devices. In this study, we developed the PDA based body fat measurement system, composed of a cradle type measurement module and a WindowCE operated software module, a regression equation for predicting lean body mass (LBM). Sixty-three weight-stable subjects (53 men, 10 women) aged 20∼32yr participated in this study. A regression model, LBM ＝ (0.0005＊Height2 - 0.0160＊Impedance ＋ 0.3920＊Weight - 0.0684＊Age - 5.8141＊Sex ＋ 25.984, was found. The correlation coefficient( r) of body fat rate between developed system and HTM1000plus(BionetTM) was 0.928. HTM1000plus is a commercially available and approved by KFDA. These results indicated that developed system is reliable for estimation of body fat rate. Although developed system is the PDA based miniaturized, it shows good performance comparing with other commercial product.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.458-465
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• 2013

The purpose of this research is possible to reduce cost of management and maintenance to realization of smartphone and using data server network technology instead of GPS. Former wireless bus information system was focused on supply side management structure and national spread thus it needs to establish GPS terminal, Windows CE, Window XP embedded and LCD panels which provide only one way communication of information of public traffic information. Therefore, former system management and maintenance cost are very expansive. This research is not use GPS terminal and other hardware equipment but design and realization using smartphone and data network server. This system also provides low cost of management and maintenance. It is not only service downtown area but also out of town and small and medium-sized cities. This system functionally gets a satisfying result user convenience and satisfaction using function of set-up route map, real-time display, and running statically analysis.