Hough변환을 이용한 정자의 형태학적 특성 분석방법에 관한 연구

박광석,이원진,백재승,Park, Kwang-Suk,Yi, Won-Jin,Paick, Jae-Seung 대한의용생체공학회 1996 의공학회지 Vol.17 No.1

Hough변환을 이용하여 정자의 행태학적 특성을 분석하는 새로운 방법을 개발하였다. 이 방법은 정자의 머리부분이 주위의 배경과 밝기의 차이를 갖는다는 특성과 함께 그 형태가 타원에 근접한다는 특성에 근거하고 있다. 정자의 머리부분은 타원을 나타내는 5개의 파라메터로 표현되고, 최적의 파라메터 값이 반복적인 Hough 변환에 의하여 검출된다. 일차적으로 정자가 있는 영역을 선택한다. Hough변환을 이용한 계산을 가능하게 하기 위하여 Hough변환된 공간의 크기를 최소한으로 줄이고, 검출된 오차가 최소화되는 방향으로 검사영역을 이동 시켜가며 최적의 파라메터들을 도출한다. 형태학적 특성을 나타내는 지표들은 정자의 형태를 나타내는 타원의 다섯개 파라메터들로부터 계산된다. A new analytic method has been developed for the analysis of sperm morphology using Hough transform. This method is based on the characteristic that sperm heads have elliptic shape in addition to the density difference with the background Sperm heads are represented in elliptic form with five parameter, and the optimal parameters are estimated by iterative Hough transform. To reduce processing time practically, we restricted the transformed space in minimum volume and moved the searching volume to the maximum gradient for the estimated error. Morphological parameters were calculated from estimated sperm head boundaries without further processing.

생체전기신호의 응용

박광석(Kwang Suk Park) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.4

Biological Signal Measurement for Ubiquitous Healthcare

Kwang Suk Park(박광석) 대한전자공학회 2006 대한전자공학회 세미나 Vol.2006 No.3

의료분야 Y2K 문제의 현황과 대응

박광석(Kwang Suk Park) 한국정보과학회 1999 정보과학회지 Vol.17 No.6

임상연구 : 상하지 광체적변동파형(Photoplethysmogram)의 진폭과 맥파전도시간을 이용한 지속적 동맥혈압 추정

서광석 ( Kwang Suk Seo ),김정수 ( Jung Soo Kim ),안원식 ( Won Sik Ahn ),박광석 ( Kwang Suk Park ),김현정 ( Hyun Jeong Kim ),염광원 ( Kwang Won Yum ),구의경 ( Eui Kyoung Goo ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.2

Background: The amplitude (AMP) of Photoplethysmogram (PPG) is used as a marker of vasodilatation. The pulse transit time (PTT), which shows a good correlation with blood pressure (BP), is not strong enough to detect the changes in BP. This study examined the sensitivity of the combined effect of the finger and toe AMP, and the PTT of PPG as a marker of the changes in BP during general anesthesia. Methods: Forty patients receiving maxillofacial surgery under general anesthesia were enrolled in this study. During surgery, the intra-arterial BP, ECG, finger and toe PPG signals were measured. Using the R-wave from the ECG, the AMP and PTT was derived from PPG data. The correlation between BP and PPG parameters (AMP and PTT) were compared. New parameters that show high correlation with the BP were found. Regression equations for calculating the BP using the PPG parameters were formulated. Results: The new parameter, log (fingerAMP/toeAMP), showed the highest correlation in each patient (mean correlation coefficient in the systolic BP: -0.846, diastolic BP: -0.858). However, when the data from all 40 patients were combined, the correlation coefficient of the toe PTT was highest (systolic BP: -0.726, diastolic BP: -0.646). The regression equation showed the highest correlation between the actual BP and calculated BP when the toe PTT and log (fingerAMP/toeAMP) were included. Conclusions: The AMP of the toe and finger PPG can be used to estimate the invasive continuous blood pressure. (Korean J Anesthesiol 2007; 53: 159~68)

두르기 공막돌륭술에 의한 안구의 기하학적 변화

서종모 ( Jong Mo Seo ) , 박광석 ( Kwang Suk Park ) , 유형곤 ( Hyeong Gon Yu ) , 정흠 ( Hum Chung ) 대한안과학회 2002 대한안과학회지 Vol.43 No.6

피라미드 영상과 퍼지이론을 이용한 폐부 혈관의 검출에 관한 연구

황준현,박광석,민병구,Hwang, Jun-Hyun,Park, Kwang-Suk,Min, Byoung-Gu 대한의용생체공학회 1991 의공학회지 Vol.12 No.2

For the automatic detection of pulmonary blood vessels, a new algorithm is proposed using the fact that human recognizes a pattern orderly according to their size. This method simulates the human recognition process by the pyramid images. For the detection of vessels using multilevel image, large and wtde ones are detected from the most compressed level, followed by the detection of small and narrow ones from the less compressed images with FCM(fuzzy c means) clustering algorithm which classifies similar data into a group. As the proposed algorithm detects blood vessels orderly according to their size, there is no need to consider the variation of parameters and the branch points which should be considered in other detection algirithms. In the detection of patterns whose size changes successively like pulmonary blood vessels, this proposed algorithm can be properly applied

혼돈 이론을 이용한 뇌파 분석에 대한 기초 연구

박해정,박광석,권준수,Park, Hae Jeong,Park, Kwang Suk,Kwon, Jun Soo 대한생물정신의학회 1995 생물정신의학 Vol.2 No.2

선형적이고 정적인 뇌파 분석의 한계를 극복하고자 비선형적이고 동적인 접근방식인 혼돈이론을 이용하여 정신분열병환자 16명, 양극성 정동장애 10명, 주요 우울증 6명 및 정상 대조군 12명을 대상으로 뇌파 분석을 시도하고, 객관적인 혼돈 연구의 도입에 있어서 고려되어야 할 문제점을 살펴보고자 하였다. 각 질환에서의 상관차원의 분포가 정상대조군보다 개인에 따른 차이가 크다는 것을 알 수 있었고, 대체적으로 측두엽 부위에서 상관차원이 크게 나타나는 경향이 있었다. 이러한 결과와 관련하여 대상환자군의 특성, 혼돈이론을 뇌파분석에 이용할 때의 주의점등에 대하여 토론하였다. The object of this study is to apply a chaotic signal analysis method to the EEG research, especially in the aspect of neuropsychiatry, and to get some inspection of the chaotic phenomena according to the brain sites and subjects. We have acquired 21 channel EEG data and one EOG according to the international 10-20 system and calculated the correlation dimension. The subject groups are schizophrenics, bipolar disorder, major depression and normal control. They were all awoke and eye-closed. We have found no distinctive features from our experiments except temporal regions have slightly higher correlation dimension. There is also no specific distinctions between groups. We conjecture that these results are mainly because the subjects were not well controlled. EEG dimension may change in accordance with to the age, sex, medication and the time data were selected to calculate. We have also considered some conditions for a better and more objective research of chaotic analysis to EEG research. Better conditioning and standardizing the calculation of correlation dimension is necessary for the application of the chaotic analysis to neuropsychiatry.

고령자의 시각기능데이터베이스 구축을 위한 시각기능계측에 관한 연구

김동욱,박광석,김정자,김남균,Kim, Dong-Wook,Park, Kwang-Suk,Kim, Jung-Ja,Kim, Nam-Gyun 대한의용생체공학회 2007 의공학회지 Vol.28 No.5

As our society progresses rapidly toward an aged society, there is a stiff increase in the population of the aged persons who have difficulties in adjusting themselves to environments due to declines of their physical functions. Therefore, there is a great need for the concept of 'Universal Design' that demands the design of overall social structure to care for the elderly. Due to this reason, the physical function of the aged persons should thoroughly be studied for the development of rehabilitation and training equipments to help the recovery of physical functions of the elderly. Among the variety of physical functions of the elderly, visual functions, motion characteristics, hearing functions, and somatosensory functions have significant influence toward everyday lives and are physical functions to study for the construction of urgently needed physical function databases of the elderly. This study concentrates on visual functions among the variety of physical functions of the elderly. To measure various visual functions of the elderly, a measurement room for the elderly has been developed, which can mimic everyday lives and perform measurements of visual functions with subjects in seated position. The measurement items for the construction of the database were capabilities in everyday vision according to changes in arrangement of colors and light intensity and capabilities in everyday vision, color distinction, dark adaptation, and light glare against changes in contrast.

영상처리를 이용한 정자의 운동 특성 분석

심훈섭,이원진,박광석,백재승,Shim, Hoon-Sup,Yi, Won-Jin,Park, Kwang-Suk,Paick, Jae-Seung 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.11

본 논문에서는 영상처리 방법을 이용하여 정자의 운동 특성을 분석하는 자동화된 방법을 개발하였다. 시스템의 구성은 별도의 전용 프로세서를 사용하지 않고 PC와 간단한 영상처리 보드로 이루어진다. 영상 처리 보드는 영상을 받아들이는 데 사용되며 PC는 영상을 처리한 다음 분석해서 정자의 운동 특성을 나타내 주는 특성 변수의 값을 계산한다. 분석 알고리듬으로서 중요한 것은 정자의 위치 검출 알고리듬과 정자의 운동 경로를 추적하는 Match matrix 방법이다. 분석한 결과를 수작업 방법 그리고 전용 프로세서를 이용하는 방법과 비교하여 신뢰할 만한 결과를 얻었다. In this paper, we developed an analyzing method of the motional characteristics of sperm, using image processing technology. Without the aid of a dedicated image-processor, this processing of a personal computer(PC) and a simple image processing board. The image processing board is used for acquiring images from a microscopic imaging source. The PC processes the images from the board and computes the parameters of motional characteristics of sperms. The algorithm of the site detection of sperms and the 'Match Matrix Method' is noteworthy. After comparing the results of our method with those of the manual method, and with those of the method using a dedicated image-processor, we concluded that our method is useful and reliable.