• 한국컴퓨터정보학회논문지
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• 제24권6호
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• pp.67-72
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• 2019

This paper proposes a computer vision-based banknote recognition system intended to assist the blind. This system is robust and fast in recognizing banknotes on videos recorded with a smartphone on real-life scenarios. To reduce the computation time and enable a robust recognition in cluttered environments, this study segments the banknote candidate area from the background utilizing a technique called Pixel-Based Adaptive Segmenter (PBAS). The Speeded-Up Robust Features (SURF) interest point detector is used, and SURF feature vectors are computed only when sufficient interest points are found. The proposed algorithm achieves a recognition accuracy of 98%, a 100% true recognition rate and a 0% false recognition rate. Although Korean banknotes are used as a working example, the proposed system can be applied to recognize other countries' banknotes.

• 자원환경지질
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• 제24권1호
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• pp.27-41
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• 1991

Taebaeg-Hajang area, in the northern part of Taebaeg city, comprises of Paleozoic sedimentary sequences and Cretaceous intrusive and volcanoclastic rocks. The rocks in the area are affected by folding and thrusting during the Bulgugsa Orogeny. In Taebaeg area, geologic structures related with thrust movement are dominant. These structures are small scale of klippe and window, back thrust, and asymmetric folds related with blind thrust. Tear fault or compartment fault due to differential movement of thrust sheets have "en echelon" arrays. Small scale transpression effects occurred along these faults and produced the flower structure. According to strain measurement using by ooids from limestone and quartz grains from quartzite, strain ratios are very low and strain ellipsoids are apparent oblate type.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.906-911
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• 2008

Because the perimeter of buildings is strongly influenced by solar and the outdoor air temperature, the area has different environmental properties compared to the interior of a building, as in summer heat gain, and in winter heat loss. In particular, if the external wall is glass, the characteristics of the glass material make it pervious to outside conditions, thereby making big changes to the thermal environment. By combining shading device and the efficient exhaust system, an energy saving can be achieved compared to no air barrier systems. The simplified air barrier system is developed with the idea that energy could be conserved by carefully and effectively blowing out the air caught between the glass surface and the roller blind. The way it is configured is therefore by making the roller blind's air-path, and by placing the air output ducts in the most optimum positions. This simplified air barrier system will give improvement in the thermal environment of the parameter area that is strongly affected by solar and the outdoor condition.

• 한국해양생명과학회지
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• 제1권1호
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• pp.56-62
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• 2016

본 연구는 넙치를 인공사육 시설에서 육성할 때 나타나는 무안측 흑화(착색증)의 스트레스 관련성을 확인하기 위해, 무안측에 체색이 없는 것(정상 그룹)와 체색이 있는 것(흑화 그룹)들 사이 스트레스 인자 비교 실험을 실시하였다. 본 실험에 사용된 실험어는 평균 전장 21.5±0.42 cm, 평균 무게 87.5±6.1 g였으며, 실험어의 무안측 착색면적률은 정상 그룹 0.63±0.12%, 착색증 그룹 16.7±4.7%였다. 분석한 스트레스 관련 인자는 혈중 GLU 및 TP, 코티졸 및 갑상선호르몬(FT₃ & FT₄) 농도 및 어체 성분(수분, 조단백, 조지방, 조회분)이었다. 실험 결과, 정상과 무안측 착색 넙치에 있어 혈중 GLU 및 TP의 농도는 정상 형질보다 착색증 형질에서 유의하게 높게 나타났다. 혈중 호르몬 농도에 있어 갑상선호르몬의 경우 정상과 착색증 그룹 사이에는 유의차를 찾아볼 수 없지만, 코티졸은 착색증 그룹이 정상 그룹에 비해 유의하게 높게 나타났다. 어체 중 영양 성분의 경우, 수분과 회분은 그룹 간 유의차가 없었지만, 조단백은 착색증 그룹이 정상보다 다소 낮으며, 조지방은 정상보다 유의하게 높았다. 이상의 스트레스 인자를 통한 정상과 착색증 그룹 간 비교를 통해 알 수 있듯, 양식산 넙치의 착색증은 만성적이 약한 스트레스에 관련되어 있을 가능성이 높은 것으로 확인되었다.

• Journal of Acupuncture Research
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• 제20권1호
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• pp.97-103
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• 2003

Objective : Auricular acupuncture is a method of treatment that involves needling the ear in order to produce relief of symptoms. This concept was first developed by P.Nogier, french doctor and referred to as somatotopic representation. Many authors have commented the fact that the vagus nerve supplies the external auditory and the concha. The aim of this randomised, single blind study was to investigate whether auricular acupuncture of the ear produced changes in the pulse rate, an indicator of vagal tone. Methods: 10 healthy man volunteers were divided into normal and epinephrine stimulation group. Then each group was divided into vagus area acupuncture and control area acupuncture group again. Epinephrine stimulation group was injected by epinephrine 0.3cc twice, first. All of them were needled in either the vagus area or control area of the ear, and pulse rate changes were measured by patient monitor over 1 hour. Results : In the epinephrine stimulation group, there was significant differences in the pulse rate change between vagus area acupuncture and control area acupuncture group. After injection of epinephrine, the basal pulse rate was increased 1.3~1.4 times in the control group. However, in the vagus area acupuncture group the basal pulse rate was increased only 1.1~1.2 times.

• ETRI Journal
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• 제24권5호
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• pp.401-404
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• 2002

In this paper, we propose a non-blind watermarking method that embeds a pseudo-random sequence (watermarks) into wavelet DC components. The DC area is not suitable for embedding because of severe visual degradation. We overcome the degradation problem by embedding watermarks into visually insensitive locations. We compare our experimental results with respect to JPEG compression with Cox’s popular correlation-based method. We also compare the robustness of our technique with other methods registered in CheckMark. This study reveals that the proposed method simultaneously provides good fidelity in quality as well as robustness against external attacks.

• 한국컴퓨터정보학회논문지
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• 제13권2호
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• pp.135-141
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• 2008

본 논문에서는 공유 비전과 특수한 청각에 의해 감지되는 인간의 공감각 특징을 구별하는 색청 인식을 제안한다. 카메라를 통한 시각적인 분석이 인간의 구조화된 사물 인식에 영향을 주는 것이 가능하다는 점이다. 그래서 시각장애인들이 실제 사물과 유사한 비전을 느낄 수 있도록 하는 방법에 대해 연구해왔다. 우선 특정 장면을 대표하는 영상 데이터에서 객체의 경계가 추출된다. 다음으로, 이미지에서 객체의 위치, 색상 평균 감성, 각 객체의 거리 정보, 그리고 객체 영역의 범위와 같은 4가지 특징을 추출하고, 이들 특징들을 청각적 요소로 사상한다. 청각적 요소는 시각장애인을 위한 시각 인식 형태로 제공된다. 제안된 색청 변환 시스템은 보다 빠르고 세부적인 인지 정보를 제공하고 동시에 감각을 위한 정보를 제공한다. 따라서 이 개념을 시각장애인의 영상 인식에 적용할 경우보다 좋은 결과를 얻을 수 있다.

• Smart Structures and Systems
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• 제13권2호
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• pp.257-280
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• 2014

In this paper, a novel PARAllel FACtor (PARAFAC) decomposition based Blind Source Separation (BSS) algorithm is proposed for modal identification of structures equipped with tuned mass dampers. Tuned mass dampers (TMDs) are extremely effective vibration absorbers in tall flexible structures, but prone to get de-tuned due to accidental changes in structural properties, alteration in operating conditions, and incorrect design forecasts. Presence of closely spaced modes in structures coupled with TMDs renders output-only modal identification difficult. Over the last decade, second-order BSS algorithms have shown significant promise in the area of ambient modal identification. These methods employ joint diagonalization of covariance matrices of measurements to estimate the mixing matrix (mode shape coefficients) and sources (modal responses). Recently, PARAFAC BSS model has evolved as a powerful multi-linear algebra tool for decomposing an $n^{th}$ order tensor into a number of rank-1 tensors. This method is utilized in the context of modal identification in the present study. Covariance matrices of measurements at several lags are used to form a $3^{rd}$ order tensor and then PARAFAC decomposition is employed to obtain the desired number of components, comprising of modal responses and the mixing matrix. The strong uniqueness properties of PARAFAC models enable direct source separation with fine spectral resolution even in cases where the number of sensor observations is less compared to the number of target modes, i.e., the underdetermined case. This capability is exploited to separate closely spaced modes of the TMDs using partial measurements, and subsequently to estimate modal parameters. The proposed method is validated using extensive numerical studies comprising of multi-degree-of-freedom simulation models equipped with TMDs, as well as with an experimental set-up.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1991년도 춘계학술대회
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• pp.28-30
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• 1991

뇌의 시세포를 전기적으로 자극할때 작고 환한 섬광을 보게된다. 이 원리를 이용하여 전기 핀 배열판으로 축구 경기장의 전광판 같은 이미지를 만들어 맹인을 위한 기능적 시각, 걷기 혹은 글 읽기를 가능케 할 수 있다. 유타대학 생체공학과는 인공시각 연구에서 최고의 역사를 가지고 있다. 최근에 개발된 실리콘 전극 배열판은 가까운 장래의 인체 실험을 남겨놓고 있다.

• ETRI Journal
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• 제36권1호
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• pp.12-21
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• 2014

In this paper, we propose a new digital blind in-phase/quadrature-phase (I/Q) mismatch compensation technique for image rejection in a direct-conversion receiver (DCR). The proposed image-rejection circuit adopts DC offset cancellation and a sign-sign least mean squares (LMS) algorithm with a unique step size adaptation both for a fast and precise I/Q mismatch estimation. In addition, several performance-optimizing design considerations related to accuracy, speed, and hardware simplicity are discussed. The implementation of the proposed circuit in an FPGA results in an image-rejection ratio (IRR) of 65 dB, which is the best performance with modulated signals, along with an adaptation time of 0.9 seconds, which is a tenfold increase in the compensation speed as compared to previously reported circuits. The proposed technique will be a promising solution in the area of image rejection to increase both the speed and accuracy of future DCRs.