• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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• pp.457-460
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• 2004

웹 기반의 디지털콘텐트 전송은 웹 객체를 단위로 이루어진다. 따라서 웹 기반 콘텐트 전송의 성능을 향상시키기 위해서는 웹 객체의 참조특성에 대한 분석이 필요하다. 본 연구에서는 웹 객체의 참조특성을 분석하였다. 또한 이 분석결과를 통해 웹 객체의 전송 효율을 높일 수 있는 방안을 제시하였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.316-320
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• 2009

In this paper, a reference-free perceptual quality metric is proposed for image assessment. It measures the amount of overall blockiness and blurring in the image. And edge-oriented artifacts, such as ringing, mosaic and staircase noise are also considered. In order to give a single quality score, the individual artifact scores are adaptively combined according to the difference between the edge-oriented artifacts and other artifacts. The quality score obtained by the proposed algorithm shows strong correlation with the MOS values by VQEG.

• 한국전자파학회논문지
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• 제8권4호
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• pp.373-381
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• 1997

디지틀 마이크로파 전송시스템은 다중경로 페이딩에 대한 대응책으로서 등화기를 필수적으로 장착하고 있다. 본 논문에서는 페이딩의 형태에 따라 기준탭의 위치를 가변시키는 기준탭 위치 가변방식 동기화를 제안하였다. 제안된 등화기는 기존의 등화기에 비해 우수한 성능을 나타내는데 MP 상황에서는 약 4~5 dB 정도의 성능개선을 얻을 수 있었으며 NMP 상황에서는 2~3 dB 정도의 성능 개선을 얻을 수 있음을 시뮬레이션 결과를 통하여 증명하였다.

• 해양환경안전학회지
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• 제1권2호
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• pp.39-52
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• 1995

There are numerous mapping, charting, geodetic systems and electronic digital products defined in various local geodetic datum. It becomes a straight forward requirement to simplify the complexity by referencing all the products to a common reference globally. WGS-84 is well known as a state-of-the-art global reference system based on the use of data, techniques and technology available within American Defence Mapping Agency(DMA). Its parameters can be translated into more accurate maps, charts and geodetic positioning compared to others previously. Since Global Positioning System(GPS/NAVSTAR), which is asssociated with World Geodetic System(WGS-84)in reference frame, has been widely used, the unified geodetic system has been required for GPS users in many fields.

• 한국기록관리학회지
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• 제3권2호
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• pp.115-141
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• 2003

본 연구에서는 학술적 가치가 있는 국내 전자저널의 장기보존을 위하여 필요한 기본적인 틀을 OAIS 참조모형을 기반으로 하여 제시하였다. 대표적인 국내 전자저널 제공기관을 중심으로 설문지법과 면접법을 병행하여 장기보존 현황을 파악하였으며, OAIS 참조모형에서 디지털 자원의 장기보존을 위하여 이론적으로 제시하고 있는 정보패키지와 기능적 모듈들을 국내 현황에 적용하여 개선되거나 보강되어야 할 기능들을 분석 정리하였다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 추계학술발표회 논문집
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• pp.423-431
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• 2003

This study presents on generation coefficients of the RFM using GEO-level stereo images of the IKONOS satellite. 3-D positioning and DEM generation of this model on the test field. In result, the maximum error of image coordinates acquired by the upward transform of the RFM did nat exceed 8 pixels. DEM was generated with kriging interpolation extracted three dimensional ground coordinate to rational quadratic function form, me compared it to reference digital elevation model made from 1:5,000 digital map and 1:1,000 digital map, and so, could generate digital elevation model in the accuracy as average RMSE of elevation was ${\pm}$ 3∼5 m in RFM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.690-692
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• 2004

Differently from an existing analog control, because the digital control includes microprocessor basically, the digital control is enable to monitor internal parameters of DC-DC converter and to control output voltage remotely by communicating with a Windows based PC and also to monitor whether exact voltage is output or not. These things are impossible in an analog control. In this paper, a simple flyback converter is taken as a control target and is controlled by a microcontroller(TMS320F2812). This converter can make variable outputs 1.8V to 5V from 30V input voltage remotely in PC. Finally the response characteristics of a step reference voltage and in a steady state are experimented to verify the feasibility and the usefulness of this digital controlled converter.

• 전자공학회논문지C
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• 제34C권4호
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• pp.26-35
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• 1997

This paper proposes a multi-bit $\Sigma\Delta$ modulator arcitecture which eliminates signal clipping problem. To avoid signal clipping, the output values of intgrators are monitored and modified by a reference value. This oepration is recorded as a digital code to restore actual signal value. Due to the digital code, the substraction of feedback value from the multi-bit quantizer can be calculated by a digital adder and this simplifies dAC operation making the accurate DAC of conventional multi-bit $\Sigma\Delta$ modulator scheme unnecessary. These features make N-th modulator can be implemented by sharing an integrator among N stages to decrease the required chip area. As an experimental example, a 4th order .sum..DELTA. modulator with oversampling ratio of 64 was simulated to show over 130 DB SNR at rail-to-rail input sinusoidal signal.

• Journal of Power Electronics
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• 제11권2호
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• pp.113-119
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• 2011

This paper presents a DSP based direct digital control design and implementation for a high power boost converter. A single loop and dual loop voltage control are digitally implemented and compared. The real time workshop (RTW) is used for automatic real-time code generation. Experimental results of a 20 kW boost converter based on the TMS320F2808 DSP during reference voltage changes, input voltage changes, and load disturbances are presented. The results show that the dual loop control achieves better steady state and transient performance than the single loop control. In addition, the experimental results validate the effectiveness of using the RTW for automatic code generation to speed up the system implementation.

• Journal of information and communication convergence engineering
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• 제9권2호
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• pp.129-134
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• 2011

Nowadays, most of exhibits are material antiquities while the exhibit of intangible cultural heritage is deficient and the form is less advanced which cannot meet the exhibition needs of digital times. This has resulted in insufficient display of intangible heritage's value which may not facilitate inherit and protection of intangible heritage, no other than protection mechanism of forming healthy industrialization. This article has established digital exhibition mode in museum about intangible cultural heritage by analysis on current museum and using mobile communication and augmented reality techniques. Discuss the mode in the layer integrating creative industry and mobile industry and provide practicable reference project of forming the healthy industrialization mechanism for protecting intangible heritage.