• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.377-380
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• 2002

In this paper, speaker and context independent emotion recognition using speech signal is studied. For this purpose, a corpus of emotional speech data recorded and classified according to the emotion using the subjective evaluation were used to make statical feature vectors such as average, standard deviation and maximum value of pitch and energy and to evaluate the performance of the conventional pattern matching algorithms. The vector quantization based emotion recognition system is proposed for speaker and context independent emotion recognition. Experimental results showed that vector quantization based emotion recognizer using MFCC parameters showed better performance than that using the Pitch and energy Parameters.

• 한국멀티미디어학회논문지
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• 제7권9호
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• pp.1255-1262
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• 2004

본 논문은 잡음이 포함된 화상의 패턴매칭 및 검증에 유효한 새로운 패턴매칭 알고리듬을 제안한다. 이 알고리듬은 화상을 푸리에변환하면 중요한 형상정보가 푸리에영역의 저주파영역에 집중된다는 데 착안하여, 푸리에영역에 나타난 화상의 원점부근만을 추출하여 비교하는 방법을 이용하고 있다. 구체적으로는 두화상의 푸리에변환한 화상의 원점부분을 추출하여 감산하고 경험적인 임계치를 적용함으로써 패턴인식이 가능함을 보인다. 본 방법은 특히 잡음이 포함된 화상과 원화상의 매칭에도 효과적이다. 잡음은 푸리에영역에서 일반적으로 고주파영역에 분포하는데 본 방법 은 저주파영역을 추출하여 비교하기 때문이다. 실험결과는 10개의 표준화상과 가우시안잡음이 첨가된 화상을 사용하여 화상을 구분해 내고, 잡음이 있는 화상도 동일한 화상으로 인식함을 보여 준다. 이 방법을 화상의 위상정보만을 이용하여 패턴인식을 수행하는 위상한정상관법과 비교한 결과, 일부의 경우에 위상한정상관법과 동등이상의 결과를 보여준다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.49-54
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• 2008

This study is to investigate an optimal size and position of PV system for apartment complex enough the electrical load matching analysis. The 4 types of arrangements of apartment buildings are considered as follows; ㅡtype, alternative ㅡtype, ㄱtype and ㅁtype. We assume that the studied site is composed of 9 buildings. Firstly, solar access evaluation of roof and facade in apartment buildings was performing with the hourly simulations of total received insolation on each surface considering the hading effect of buildings. Electrical load profile of typical Korean apartments was investigated for the lad matching analysis. To calculate an annual total PV output, we used MERIT program which is a sourly based load matching tool developed by ESRU. TRY weather data of Daejeon are applied for this analysis. Result shows that approximately 11% of total electric load of the site can be supplied by the PV system in the case of full installation of PV system at the whole south-face roof area of 9 buildings in this stuided apartment complex. Depending of a various installation option of roof and facade area, the possible ratio of PV supply in total electrical load varies from 9% to 42%. Among the 4 arrangement types, the ㅡ type revealed the best option for the maximum output of PV system.

• 자원ㆍ환경경제연구
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• 제28권4호
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• pp.527-556
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• 2019

에너지바우처사업은 약 60만 가구를 대상으로 연간 천억 원 가까이가 투입되는 에너지 복지분야에서 가장 규모가 큰 사업으로, 세계적으로도 매우 드문 사례이다. 본 연구는 에너지바우처 지급에 따른 가구의 에너지소비 확대 효과를 실증한다. 「한국복지패널」 저소득가구를 대상으로 성향점수매칭을 통해 비수혜가구를 추출하며, 단순 이분차분과 함께 고정효과 모형을 활용하였다. 바우처를 수혜한 가구에서 월평균 4,371~4,870원을 에너지소비에 추가로 지출하는 것으로 추정되었다. 지원액 대비 51.9~57.7%에 상당하는 비율로, 식품권의 23~56%와 비교할 때에도 가장 높은 수준에 해당된다. 바우처 지급이라는 에너지복지분야에서의 새로운 시도는 충분히 성공적으로 자리잡은 것으로 평가할 수 있다. 반면, 비수혜가구로부터 확인되는 사각지대의 문제나 에너지소비환경을 반영할 수 있는 차등 지원 등은 향후 해소해나가야 할 과제일 것이다.

• Journal of the Optical Society of Korea
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• 제7권3호
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• pp.139-144
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• 2003

We have characterized the optical parametric chirped-pulse amplification of femtosecond Ti:sapphire laser pulses by using a BBO crystal. It is numerically verified that a high gain and a broad gain bandwidth can be obtained with a 532-nm pump laser. The dependence of the gain profile of OPA on phase matching angles, pump intensity, and crystal length is numerically investigated. Experimental results shows that the temporal fluctuation of a pump laser causes the modulation of an amplified spectrum in OPCPA.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2000년도 춘계 학술대회 및 국제 감성공학 심포지움 논문집 Proceeding of the 2000 Spring Conference of KOSES and International Sensibility Ergonomics Symposium
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• pp.366-369
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• 2000

This paper examines three algorithms to recognize speaker's emotion using the speech signals. Target emotions are happiness, sadness, anger, fear, boredom and neutral state. MLB(Maximum-Likeligood Bayes), NN(Nearest Neighbor) and HMM (Hidden Markov Model) algorithms are used as the pattern matching techniques. In all cases, pitch and energy are used as the features. The feature vectors for MLB and NN are composed of pitch mean, pitch standard deviation, energy mean, energy standard deviation, etc. For HMM, vectors of delta pitch with delta-delta pitch and delta energy with delta-delta energy are used. We recorded a corpus of emotional speech data and performed the subjective evaluation for the data. The subjective recognition result was 56% and was compared with the classifiers' recognition rates. MLB, NN, and HMM classifiers achieved recognition rates of 68.9%, 69.3% and 89.1% respectively, for the speaker dependent, and context-independent classification.

• ETRI Journal
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• 제44권5호
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• pp.759-768
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• 2022

A novel energy harvesting technique that uses conducted electromagnetic interference as an energy source is presented. Conducted EMI generated from fluorescent light using a switched-mode power supply was measured and modeled as an equivalent voltage source. Two types of rectifier circuits-a bridge rectifier and a voltage doubler-were used as the harvesting devices for conducted EMI source. The matching networks were designed based on the equivalent model, and the harvested power was improved. The implemented energy harvester produces a regulated power over 68.9 mW and current over 15.1 mA while a regulated voltage can be selected between 3.3 V and 5 V. The proposed system shows the highest harvesting power indoor environment and can provide enough power for the Internet of Things devices.

• IEIE Transactions on Smart Processing and Computing
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• 제5권3호
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• pp.215-221
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• 2016

This paper describes an automatic vowel sequence reproduction system for a talking robot built to reproduce the human voice based on the working behavior of the human articulatory system. A sound analysis system is developed to record a sentence spoken by a human (mainly vowel sequences in the Japanese language) and to then analyze that sentence to give the correct command packet so the talking robot can repeat it. An algorithm based on a short-time energy method is developed to separate and count sound phonemes. A matching template using partial correlation coefficients (PARCOR) is applied to detect a voice in the talking robot's database similar to the spoken voice. Combining the sound separation and counting the result with the detection of vowels in human speech, the talking robot can reproduce a vowel sequence similar to the one spoken by the human. Two tests to verify the working behavior of the robot are performed. The results of the tests indicate that the robot can repeat a sequence of vowels spoken by a human with an average success rate of more than 60%.

• 한국항공우주학회지
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• 제38권2호
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• pp.141-149
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• 2010

위성 편대 비행 시 주위성과 부위성 간의 연료 소비 균형을 고려한 임펄스 기동에 관한 연구를 수행하였다. 위성 간 사용가능한 연료량을 비교하여 가중치(weight)를 두고 가격함수(cost function)를 설계하여 라그랑지 승수법을 통해 필요한 임펄스를 획득하였다. 상대궤도 발산 방지를 위해 에너지 매칭 기법을 사용하였고, 임펄스 기동 후 상대 거리 구속이 이루어짐을 시뮬레이션을 통해 확인하였다. 시뮬레이션은 지구 중력 외의 외란이 없는 경우와 대기 항력이 외란으로 존재하는 상황으로 시나리오를 나누어 수행하였다. 본 논문 결과는 이후 실제로 위성을 편대로 사용한 위성 군집 비행 시, 상대 궤도 구속 요건을 만족하고 각 위성의 연료량을 비교한 임펄스 기동이 요구될 때 사용가능할 것으로 기대된다.

• ETRI Journal
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• 제23권2호
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• pp.41-51
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• 2001

MPEG-7 standardization work has started with the aims of providing fundamental tools for describing multimedia contents. MPEG-7 defines the syntax and semantics of descriptors and description schemes so that they may be used as fundamental tools for multimedia content description. In this paper, we introduce a texture based image description and retrieval method, which is adopted as the homogeneous texture descriptor in the visual part of the MPEG-7 final committee draft. The current MPEG-7 homogeneous texture descriptor consists of the mean, the standard deviation value of an image, energy, and energy deviation values of Fourier transform of the image. These are extracted from partitioned frequency channels based on the human visual system (HVS). For reliable extraction of the texture descriptor, Radon transformation is employed. This is suitable for HVS behavior. We also introduce various matching methods; for example, intensity-invariant, rotation-invariant and/or scale-invariant matching. This technique retrieves relevant texture images when the user gives a querying texture image. In order to show the promising performance of the texture descriptor, we take the experimental results with the MPEG-7 test sets. Experimental results show that the MPEG-7 texture descriptor gives an efficient and effective retrieval rate. Furthermore, it gives fast feature extraction time for constructing the texture descriptor.