• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.251-255
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• 2004

본 연구에서는 현장에서의 유량측정 전 과정과 내업에서의 자료 검토 및 관리 등 일련의 유량측정 과정을 일관성 있고 편리하게 수행할 수 있도록 하는 유량측정 보조 장비인 PDA 시스템을 개발하였다. PDA는 방수가 가능하고, 휴대 가능한 소형이며, 계산, 자료 관리 및 전송 기능을 가지고 있으므로 이를 이용하여 유량측정 전 과정을 수행할 수 있으며, 이의 현장 활용을 통해 현장의 유량측정 정확도를 크게 개선시킬 수 있다. 더불어, 무선 전송된 현장 유량측정 결과를 원격지에서 수신하여 그 정확도를 재검토할 수 있도록 일반 PC용 유량 산정 및 검토용 시스템을 볕도 구축하였다. 개발된 PDA 시스템은 각종 유량측정 용역사업을 수행하는 용역업체 및 대학 등에서 유량측정 및 현장 평가, 보고 및 자료 관리 등에 직접 활용될 수 있을 것으로 기대되려, 유랑측정용 PDA 시스템의 사용을 통해 일관성 있고 충실한 유량측정자료를 지속적으로 확보한 다면, 이후 신뢰성 있는 유량자료를 확보하는데 기여할 수 있을 것으로 판단된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3039-3042
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• 2009

Home automation system is a demo which is capable of remote monitoring and control on PDA device (which was) programming used by LabVIEW PDA module in embedded system. Every operation program is composed of LabVIEW. And each embedded system is made of self-operating mode without any wiring of PC. This home automation system is controlled by LabVIEW of PDA through Wireless LAN(802.11b).

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.199-201
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• 2001

최근 모바일 컴퓨팅 기술이 발전되면서, PDA 등과 같은 소형 컴퓨팅 장치가 빠른 속도로 보급되고 있다. PDA는 이동전화나 무선 LAN 등을 통해서 다른 PDA 또는 일반 컴퓨터에 접속해서 메일 수신, 인터넷, 채팅 등에 사용되고 있다. 우리는 PDA간 또는 PDA와 데스크탑 컴퓨터간의 음성통신 기능을 제공하는 음성 전화 시스템을 개발하였다. 본 논문은 우리가 개발한 음성 전화 시스템의 기능, 구조, 구현을 소개한다. 우리의 음성 전화 시스템은 Windows CE 환경 하에서 동작하고 H.323을 지원하도록 설계되어있다. 또한, 본 논문에서는 음성통신을 위한 송, 수신 버퍼 사용의 효율적인 방법을 제안한다. 우리의 조사에 의하면, Windows CE 기반의 음성전화시스템에 대한 기존 연구가 거의 발표되지 않았다.

• East Asian mathematical journal
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• v.33 no.1
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• pp.83-102
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• 2017

The main purpose of this paper is to introduce a pair new class of primal and dual problem associated with an operator. We prove the sufficient optimality theorem, weak duality theorem and strong duality theorem for these problems. The equivalence between the generalized optimization problems and the generalized variational inequality problems is studied in ordered topological vector space modeled in Hilbert spaces. We introduce the concept of partial differential associated (PDA)-operator, PDA-vector function and PDA-antisymmetric function to show the existence of a new class of function called, ($T_{\eta};{\xi}_{\theta}$)-invex functions. We discuss first and second kind of ($T_{\eta};{\xi}_{\theta}$)-invex functions and establish their existence theorems in ordered topological vector spaces.

• The Korea Journal of Herbology
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• v.28 no.5
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• pp.95-101
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• 2013

Objectives : A quantitative method using high performance liquid chromatography with a photodiode array detector(HPLC-PDA) was established for the quantitative analysis of the four main compound and pattern analysis to classification Piiellia ternate, P. pedatisecta and Typhonium flagelliforme. Methods : The analytical procedure for the determination of P. ternata, together with the known main compounds uracil, uridine, guanosine and adenosine was established. Optimum HPLC-PDA separation of these P. ternata was possible on Luna C18(2) column material, using water and acetonitrile as mobile phase. The method was validated according to regulatory guidelines. In addition, this assay method were analyzed for the content of four main compound in P. ternata, P. pedatisecta and T. flagelliforme and by data obtained from the HPLC-PDA analysis was performed principal component analysis(PCA). Results : Validation results indicated that the HPLC method is well suited for the determination of the roots of P. ternata with a good linearity ($r^2$ > 0.999), precision and recovery rates. Analysis of HPLC-PDA, the average content of uracil, uridine, guanosine and adenosine was significantly higher in P. ternate>P. pedatisecta> T. flagelliforme order. The application of PCA to main compound data by HPLC-PDA permitted the effective discrimination among the three species. Conclusions : Analysis of both HPLC-PDA and PCA confirmed the fact that four main compound and pattern profiles of P. ternata, P. pedatisecta and T. flagelliforme were different from each other.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.532-534
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• 2003

휴대인터넷의 보급에 따라 모바일 컨텐츠 시장의 주류로 부상하는 PDA/스마트 폰 기반의 게임 포털 서비스 가능성을 타진한다. PDA/스마트폰은 PC보다는 제한적인 CPU파워와 메모리크기 때문에 PC와 대등한 수준의 컨텐츠 제공이 어렵다고 알려져 있다. 본 논문에서는 게임 포털에서 꼭 필요한 각종 기능들을 PDA상에서 구현하고 테스트 한 결과를 제시함으로써 현재의 휴대인터넷과 PDA/스마트 폰 성능으로도 충분히 높은 완성도의 모바일 게임 포털 구현이 가능함을 보인다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.279-282
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• 2002

In this paper, we present a new method for monitoring of ECU's self diagnostic signals of vehicle without wire. In order to measure the ECU's self diagnostic signals, the interfaced circuit is designed to communicate ECU and a designed display terminal according to the ISO, SAE regulation of communication protocol standard. A 80C196KC processor is used for communicating ECU's self diagnostic signals and the results are sent to PDA monitoring system. Software on PDA is developed to monitor the ECU's self diagnostic signals using the Embedded Visual C++ compiler in which RS232 port is programmed by half duplex method. The algorithms for measuring the ECU's self diagnostic signals are verified to monitor ECU's state. At the same time, the information to fix the vehicle's problem can be shown on the developed PDA software. The possibility for remote measurement of ECU self diagnostic signal using PDA is also verified through the developed systems and algorithms.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.4
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• pp.74-82
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• 2006

This paper describes the steady flow characteristics due to PDA and tumble control valve in combustion chamber. We also investigated the flow inclination angle defined as the inverse tangent of non-dimensional rig tumble(NRT) devided by non-dimensional rig swirl(NRS) to find dominant flow direction. So we adapted two different types of PDA valve(port deactivation valve) to strengthen a swirl flow. The in-cylinder swirl flow different tendency between with/without PDA valve. It might be thought to be affected by swirl flow. We could find that tumble ratio and swirl ratio is different by PDA valve. The comparison are taked account of the swirl, the tumble ratio comparison in same mass flow rate. As a result, PDA valve is better than tumble control valve both in steady flow condition and swirl, tumble ratio. The data from present study are available for design of engine as the basic data.

• Journal of the Institute of Convergence Signal Processing
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• v.10 no.3
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• pp.170-175
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• 2009

In this paper, we propose real time automatic speaker verification (ASV) system to protect personal information on personal digital assistant (PDA) device. Recently, the capacity of PDA has extended and been popular, especially for mobile environment such as mobile commerce (M-commerce). However, there still exist lots of difficulties for practical application of ASV utility to PDA device because it requires too much computational complexity. To solve this problem, we apply the method to relieve the computational burden by performing the preprocessing such as spectral subtraction and speech detection during the speech utterance. Also by applying the hidden Markov model (HMM) optimal state alignment and the sequential probability ratio test (SPRT), we can get much faster processing results. The whole system implementation is simple and compact enough to fit well with PDA device's limited memory and low CPU speed.

• Korean Chemical Engineering Research
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• v.49 no.3
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• pp.348-351
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• 2011

In this research, we developed a sensor system which can easily detect several chelating agents using polydiacetylene(PDA) vesicles. In comparison to other sensors, PDA based sensor has several advantages. First, detection method is much simpler and faster because it does not require any labeling step in the experiment procedure. Second, significant color-transition from blue to red based upon external stimulus allows us the detection by naked eyes. Finally, it is also possible to perform quantitative analysis of the concentration of the chelating agent by measuring the colorimetric response. In this paper, five types of chelating agents were used, including EDTA, EGTA, NTA, DCTA and DTPA. Among them, EDTA and DCTA triggered especially strong color-transition. In conclusion, this study has led to a successful development of a color transition-based PDA sensor system for easy and rapid detection of chelating agents.