• 문화기술의 융합
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• 제4권1호
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• pp.291-297
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• 2018

본 논문에서는 무대에서의 방송용 카메라를 위한 자동 객체추적 시스템을 구현한다. 객체추적을 위해서 Open-CV 기반의 파이썬 프로그램을 탑재한 PC, 라즈베리파이 3, 모바일 장치를 사용한다. 영상 객체추적 방법으로는 mean-shift, CAMshift, GMM을 이용한 백그라운드 모델링, SURF를 이용한 템플레이트 기반 추적, CMT, TLD 등의 방법들이 있다. CAMshift 알고리즘은 고속 및 성능의 강인함으로 실시간 추적에 효율적이지만, 본 논문에서는 CMT 알고리즘을 이용한 방송용 카메라의 영상 객체추적 시스템을 구현한다. 이것은 정적 및 적응형 일치성 때문에 최적의 영상 추적 방법이다. 제안된 시스템은 무대에서의 실시간 연속적인 객체추적을 위한 효율적이고 강인한 영상 추적 시스템에 잘 응용될 수 있다.

• 농업과학연구
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• 제45권4호
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• pp.789-797
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• 2018

This study investigated the activity of crude enzymes obtained from Pyrus pyrifolia cv. Shingo on milk proteins. In the milk processing industry, there is an increasing interest in the addition of functional materials to dairy products or functional peptides isolated from milk proteins. First, Pyrus pyrifolia cv. Shingo was separated into core, flesh, and peel regions, and crude enzymes were obtained from the individual regions. The activity of the obtained crude enzymes was measured using casein and gelatin agar. The crude enzyme obtained from the flesh of Pyrus pyrifolia cv. Shingo decomposed gelatin, but the activity of the crude enzymes obtained from the peel and core regions was insignificant. On the other hand, the crude enzymes obtained from the flesh and core regions of Pyrus pyrifolia cv. Shingo had a remarkable enzymatic activity in casein agar. However, the activity of the crude enzyme obtained from the peel region was insignificant. In addition, the crude enzymes obtained from the individual regions were mixed with casein to induce reactions, and the degradation patterns were investigated through electrophoresis and high performance liquid chromatography (HPLC). According to the results, the crude enzymes from Pyrus pyrifolia cv. Shingo degraded milk proteins. Thus, the results of this study can be used in studies on functionality. Additionally, it is expected that the use of pear peels and cores in the milk processing industry would greatly contribute to the reduction of food waste.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권10호
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• pp.687-692
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• 1999

A new technique to measure low level capacitance variations of the gyroscope is proposed and verified by computer simulation. It is based on the new CV(capacitance-voltage) converter circuit biased by dc current source and the peak detector without low pass filter. The CV converter biased by dc current source provides good signal-to-noise ratio and this setup of the detection circuitry without low pass filter makes it possible to provide short settling time, that is, higher speed of measurement and wide operation range if only a few parameters are adjusted. The key parameters that affect the performance of the detection circuitry are illustrated and computer simulation results are presented. The demonstrated detection circuitry shows linear response from 10 fF to 130 fF at 10 kHz and shows good linearity.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 춘계학술대회
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• pp.652-655
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• 2012

IT 기술과 카메라 기술의 발전으로 영상처리 서비스에 대한 다양한 응용이 가능하게 되고 있다. 본 논문에서는 궁극적으로 주차관리 시스템을 자동화하기 위해 Intel 기반의 환경에서 최적화된 성능을 나타내는 EmguCV를 사용해 차량의 고유번호인 자동차 번호판 인식을 위한 시스템을 설계 및 구현하였다. 본 논문에서는 WPF를 이용해 관리자가 전체 시스템을 간편하고 직관적으로 관리할 수 있도록 UI를 설계 및 구현하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.763-764
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• 2008

Sensing is an important part of a smart home system. Vision sensors are a type of passive systems, which are not sensitive to noise. In this paper, we implement a prototype for stereo vision systems using OpenCV. It is an open source library for computer vision developed by Intel corporation. The prototype will by used for comparing performance among various stereo algorithms and for developing a stereo vision smart camera.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.142-144
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• 2019

Nowadays, multi-MHz wireless power transfer (WPT) system has received a great concern of study due to its desirable characteristics such as user convenience, system compact and better safety as compared to the conventional DC-DC with cord. This paper presents a solution for WPT Lithium Batteries charger with Constant Current (CC) and Constant Voltage (CV) charging process. The proposed system consists of a high frequency class D power amplifier, a pair of PCB coil, transformable high-order resonant network and a full-bridge rectifier. The charger can be implemented CC /CV charging profile thanks to automatic reconfigurable resonant compensator. Therefore, the battery can be fully charged without the help of an additional DC/DC converter. The simulation and 50W-6.78-MHz hardware experimental results are presented to verify the feasibility of the proposed method and to evaluate the performance of the proposed wireless battery charger.

• 한국음향학회지
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• 제21권2호
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• pp.160-166
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• 2002

본 논문에서는 CV (Consonant Vowel), VCCV (Vowel Consonant Consonant Vowel), VC (Vowel Consonant) 인식 단위를 이용한 새로운 어휘 독립 음성인식 시스템을 구현하였다. 이 인식 단위는 음절의 안정된 모음 구간에서 분할하여 구성했기 때문에 분할이 용이하다. VCCV단위가 존재하지 않을 경우에는 VC와 CV 반음절 모델을 결합하여 대체모델을 구성하였다. 모음군 군집화 (clustering)와 VCCV 모델이 존재하지 않을 경우 대체모델에 결합규칙을 적용하여 제 1후보에서 90.4% (모델 A)에서 95.6% (모델 C)로 5.2%의 인식 성능향상을 가져왔다. 인식실험결과 제 2후보에서 98.8%의 인식률로 제안된 방법이 효율적임을 확인하였다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2013년도 제48차 하계학술발표논문집 21권2호
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• pp.61-64
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• 2013

본 논문에서는 모바일 기반 OpenCV 라이브러리를 이용한 마커리스 객체 인석 성능 향상을 위한 소프트웨어적인 관점의 방법을 제안한다. 기존의 마커리스 기반 알고리즘을 이용하여 테스트를 수행한 후 성능에 저하를 발생시키는 요인들을 분석하고 그에 따른 상황별 적절한 해결책을 제시한다. 이에 따라 크게 프로그램 코드 개선, 마커리스 기반 알고리즘 코드 개선, 센서를 활용한 성능 향상을 도모한다. 프로그램 코드 개선은 테스트 결과를 분석 한 후 수행시간이 가장 많이 소요되는 함수를 최적화하고 또한 최적의 특징점의 수를 제한한다. 마커리스 기반 알고리즘 코드 개선은 병렬 처리가 제공되는 모바일에 한하여 병렬처리기법으로 코드를 수정한다. 마지막 센서를 활용한 성능향상은 실시간 작업 처리 단위를 묶음으로 처리하였을 때 발생하는 품질의 저하를 보정하는 역할을 수행한다. 본 논문에서는 이러한 마커리스 객체 인식 성능 향상 방법을 소프트웨어적인 관점에서 제안하고 이에 대한 결과 모바일 기반 실시간 증강현실 서비스를 위한 성능 향상 면에서 효과적이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2522-2525
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• 1999

Buck converter is considered to be one of the most widely used DC-DC converters due to its simple structure and high reliable performance. However, when it be combined with thin-film inductor, its own low inductance requires higher switching frequency in order to maintain optimum output ripple voltage and thus gives rise to extra switching losses. In view to overcoming such a technical in-convenience, soft switching fashion is suggested such as zero-voltage-switching of which an well known example is a Zero-Voltage-Switching clamp voltage(ZVS-CV) converter for which low inductance is imperatively required for ZVS operation. In order to support our suggestion, a 1W of ZVS-CV buck converter( Vo=3.3V, Iomax=0.3A, fs= 1.2MHz) is built by use of thin-film inductor, and then tested for comparing the measured efficiency between ours and conventional one. As the our results. the efficiency is improved about 2% at full load by the application of our concept.

• Journal of Animal Science and Technology
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• 제57권3호
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• pp.7.1-7.7
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• 2015

To meet the increasing demands of specific pathogen free (SPF) minipigs in biomedical researches, 8 pregnant Chinese Wuzhishan minipigs (WZSP) sows with clear background were chosen to obtain SPF WZSP by hysterectomy. At $111{\pm}days2$ of the pregnancy, piglets were aseptically taken out from the sows and artificially suckled for 40 to 45 days in the positive isolators. Then, the piglets defined as F0 were transferred to barrier environment and fed with standard feeds. The original SPF colony was formed for breeding by selected piglets from F0 group of 6-8 months old. Biological characteristics of SPF WZSP were collected and further compared to those of conventional (CV) WZSP, including growth performance, reproductive performance, hematology and blood biochemistry, and major pathogens detection. As a result, 61 F0 piglets were obtained from 8 candidate sows, and 55 out of them survived. After strictly selection, 35 F0 piglets were used to form the original SPF colony, which produced 14 litters of SPF piglets defined as F1. Piglet survival rates, growth performance, and reproductive performance of SPF WZSP were similar to CV WZSP. Some hematology and blood biochemistry parameters showed significant differences between SPF and CV WZSP. Eighteen kinds of pathogens were identified to be free in F0 and F1 SPF colony by repeated pathogen detections. In conclusion, we established a satisfied SPF WZSP colony maintaining original characteristics, free of controlled diseases, and being proved to be a suitable laboratory animal.