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RISS 인기검색어
- 검색키워드
- 저자 : 황문구(Moon-Gu Hwang) (검색결과 6 건)
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황문구(Moon-Gu Hwang),김형래(Hyoung-Rae Kim),강석범(Suk-Bum Kang),양태규(Tae-Kyu Yang) 한국정보기술학회 2007 한국정보기술학회논문지 Vol.5 No.3
Recognition of hand gestures consists of two steps which are preprocessing step using PCA algorithm and classification step using BP algorithm. The PCA algorithm is a technique used to reduce multidimensional data sets to lower dimensions for effective analysis. In our simulation, the PCA is applied to calculate feature projection vectors for the image of a given hand. The BP algorithm is capable of doing parallel distributed processing and expedite processing since it take parallel structure. The BP algorithm recognized in real time hand gestures by self learning of trained eigen hands. The proposed PCA and BP algorithm show improvement on the recognition compared to PCA algorithm.
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황문구(Moon-Gu Hwang),김형래(Hyoung-Rae Kim),강석범(Suk-Bum Kang),양태규(Tae-Kyu Yang) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.2
In this paper we proposed a new real time based gesture recognition method based on vision technology using fuzzy inference. Transforming the acquired image from camera into color model which is robust to the change of lighting and illumination, detecting skin color only by a few colors except brightness components and then altering skin area component into a white color and the other component into a black color by binirization process. To detect a correct skin area, a process of eliminating the arm part should be added because the binarized white area can include unnecessary arm part area. We have succeeded in detecting a robust and exact hand area for hand gesture recognition. For this, we have used the fuzzy logic inference engine which has an input of difference value between the center of area of binary image and the center of a circumscribed rectangle. After detecting a hand area, a circle which has the center of area in skin component area is made for counting the intersection points between the circle and the gestured finger line. We demonstrated the effectiveness of our algorithm by some experiments.
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黃文龜 大田開放大學 1987 論文集 Vol.6 No.-
In this paper, the transmission and reception characteristics are studied for SAW Filters of the IDT electrode form. The device equivalent circuit is structured by the electrically equivalent circuit with the "In line field model" and "Cross field model". Linear network models are used to represent the IDT as a chain of identical three-ports which are acoustically in cascade but electrically in parallel. The network model emphasizes a series connection for the two acoustic loads while utilizing lumped impedance elements expressed as functions of the delay operator. An exact analysis of the plate dynamics permits a simplified resistive model for conditions of light asymmetry in acoustic leading. A simplified resistive structure provides transmission and reception loss near the half wave resonance. Finally, RLC lumped component models are provided for evaluation of IDT as lumped element SAW Filters. Low values of acoustic reflection loss are predicted theoretically and observed experimentally when the electric load and transducer capacitance are in resonance.
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等價回路 모델을 이용한 SAWF의 動作特性에 關한 硏究
黃文龜 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0101
The operation characteristics are studied for the surface acoustic wave filter of the interdigital electrode form. The essential 3-port characteristics of the interdigital transduducer have been described by linear equivalent circuits based on approximate one-dimensional models. Linear network models are used to represent the transducer as a chain of indentical 3-port which are acoustically in cascade but electrically in parallel. Two criteria have been presented to determine which of the "crossed field" or "in line field" model is more appropriate for a specific piezoelectric configuration. Predominance of the normal field term indicates that the "crossed field" model is the more suitable of the two models. Conversely, the "in line field" model is selected when the parallel field term is largest. Transducer operation at acoustic synchronism is described theoretically and compared to current experimental data for transducers operating at 100MHz and fabricated on lithium niobate. Low values of acoustic reflection loss are predicated theoretically and observed experimentally when the electric load and transducer capacitance are in resonance. The frequency dependence of transducer radiation immittance is studied, and the response is found to be analogous to the response of an endfire antenna array.
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박동훈,黃文龜 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0101
This paper describes the stepped protection circuit to protect SLIC against overvoltage or overcurrent which occur on the subscriber line due to lightning surges. The primary protection circuit is combined with the overvoltage function of the BORSCHT circuit, which is one of basic functions of the SLIC, and a gas tube arrester set In the MDF. The stepped protector consists of a gas tube arrester, a PTC thermistor, a ZNR varistor and multistory thyristor and we has achieved protection effects with more improved results lightning surges.
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