두 음악가 이야기

박성희,Park, Seong-Hui 대한석유협회 1992 석유와 에너지 Vol.1992 No.6

다시점 비디오의 색상 성분 보정을 위한 특징점 기반의 전처리 방법

박성희,유지상,Park, Sung-Hee,Yoo, Ji-Sang 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.12

본 논문에서는 특징점 기반 색상 보정을 통한 다시점 비디오 부호화 전처리 방법을 제안 한다. 다시점 영상은 조명 및 카메라 간의 특성차이로 인해 인접 시점 간 색상차를 갖게 된다. 이를 보정하기 위한 여러 가지 방법 중, 본 논문에서는 영상 간의 대응되는 특징점들을 기반으로 상대적인 카메라의 특성을 모델링하고 이를 통해 색상을 보정하는 방법을 제안한다. 대응되는 특징점을 추출하기 위해 Harris 코너 검출법을 사용하고, 모델링 된 수식의 계수는 가우스-뉴튼 순환 기법(Gauss-Newton circulation algorithm)으로 추정한다. 또한 참조 영상을 기준으로 보정해야할 타겟 영상의 색상값을 RGB 성분별로 보정한다. 테스트 영상을 가지고 실험한 결과 제안한 전처리 방법으로 보정을 하였을 경우, 전처리 과정을 거치지 않았을 때보다 화질 및 압축효율이 향상됨을 알 수 있었다. 또한 누적 히스토그램 기반의 전처리 방식과 비교했을 때, PSNR은 성분별로 0.5 dB ~ 0.8dB 정도 개선되고 bit rate 는 14% 정도 감소되는 성능을 확인하였다. In this paper we propose a new pre-processing algorithm applied to multi-view video coding using color compensation algorithm based on image features. Multi-view images have a difference between neighboring frames according to illumination and different camera characteristics. To compensate this color difference, first we model the characteristics of cameras based on frame's feature from each camera and then correct the color difference. To extract corresponding features from each frame, we use Harris corner detection algorithm and characteristic coefficients used in the model is estimated by using Gauss-Newton algorithm. In this algorithm, we compensate RGB components of target images, separately from the reference image. The experimental results with many test images show that the proposed algorithm peformed better than the histogram based algorithm as much as 14 % of bit reduction and 0.5 dB ~ 0.8dB of PSNR enhancement.

유동층 반응기에서 HDPE 입자의 CF4 프라즈마 표면처리

박성희,김상돈 ( Soung Hee Park,Sang Done Kim ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.1

견인전동기용 고정자 코일의 Off-line 부분방전 진단을 위한 NN의 적용

박성희,임기조,강성화,Park, Seong-Hee,Lim, Kee-Joe,Kang, Seong-Hwa 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.8

In this study, PD(partial discharge) signals which occur at stator coil of traction Motor are acquired these data are used for classifying the PD sources. NN(neural network) has recently applied to classify the PD pattern. The PD data are used for the learning process to classify PD sources. The PD data come from normal specimen and defective specimens such as internal void discharges, slot discharges and surface discharges. PD distribution parameters are calculated from a set of the data, which is used to realize diagnostic algorithm. NN which applies distribution parameters is useful to classify the PD patterns of defective sources generating in stator coil of traction motor.

일 병원의 외래진료대기시간 지연요인 분석

박성희,Park, Seong-Hi 한국의료질향상학회 2001 한국의료질향상학회지 Vol.8 No.2

Background : To shorten processing time for variety of medical affairs of the patient at the outpatient clinic of a big hospital is very important to qualify medical care of the patient. Therefore, patient's waiting time for medical examination is often utilized as a strong tool to evaluate patient satisfaction with a medical care provided. We performed this study to investigate factors delaying related with waiting time for medical examination. Methods : The data were collected from June 26 to July 30, 1999. A total 275 case of medical treatment and 5,634 patients who visited outpatient clinics of a tertiary hospital were subjected to evaluate the waiting time. The data were analyzed using frequency, t-test, ANOVA, $X^2$-test by SPSS Windows 7.5 program. Results : The mean patient's waiting time objectively evaluated ($30.9{\pm}33.9$ min) was longer than that subjectively by patient evaluated ($25.1{\pm}26.2$ min). Patient waiting time objectively evaluated was influenced by the starting time of medical examination, consultation hours, patients arriving time etc, as expected. The time discrepancy between two evaluations was influenced by several causative factors. Regarding the degree of patients accepted waiting time with the medical examination is 20 min. Conclusion : The results show that, besides the starting time of medical examination, consultation hours and patients arriving time, influence the patient's subjective evaluation of waiting time for medical examination and his satisfaction related with the service in the big hospital. In order to improve patient satisfaction related with waiting time for medical examination, it will be effective examination rather than to shorten the real processing time within the consultation room.

유가인하 - 연탄보일러에서 기름난방으로 바꾸고

박성희,Park, Seong-Hui 대한석유협회 1988 석유와 에너지 Vol.1988 No.11

경기도 식중독에서 분리된 Clostridium perfringens의 유전적 특성 분석

박성희,최옥경,정진아,김운호,이예은,박광희,윤미혜,Park, Sung-Hee,Choi, Ok-Kyung,Jeong, Jin-A,Kim, Woon-Ho,Lee, Yea-Eun,Park, Kwang-Hee,Yoon, Mi-Hye 한국미생물학회 2016 미생물학회지 Vol.52 No.3

질병관리본부에서 2012년 이후 수인성식품매개질환 실험실 진단실무지침에 cpb2 유전자를 포함시킨 후, 2013-2014년 경기도의 C. perfringens에 의한 식중독이 원인불명을 제외하고 가장 많이 발생되었으며, 그 발생률이 2011-2012년에 비해 큰 폭으로 증가하였다. 따라서 경기도내 유행하는 toxinotype을 파악하고, PFGE, MLST를 통해 이들의 분자역학적 연관성을 연구함으로서 C. perfringens에 의한 식중독 발생 시 역학조사 기초자료로 활용하고자 하였다. 2013-2014년 경기도에서 분리된 120주의 C. perfringens 중 cpe 보유균주는 49주, cpb2 보유균주는 71주였다. 발생건별로 살펴보면, cpe 단독발생건은 2건(10주), cpb2 단독발생건은 7건(45주), cpe, cpb2 혼합발생건은 7건(65주)로 cpb2 단독발생과 cpe, cpb2 혼합발생이 대부분을 차지하였다. Toxinotype PCR 결과, 120주 모두 C. perfringens에 의한 식중독의 주요 타입인 A로 밝혀졌다. PFGE 분석 결과, 53.5-100%의 유사도와 75 유형으로 나뉘었다. 65% 이상을 기준으로 했을 때 5가지 그룹으로 나뉘어졌다. A, C, D, E 그룹은 1개의 균주를 제외하고 모두 cpb2 보유균주로 이루어졌고, B 그룹은 1개의 균주를 제외하고 모두 cpe 보유균주로 구성되었다. 2014년 안산상록구 식중독 4주와 2014년 수원 권선구 식중독 3주를 제외하고, 64 cpb2 보유균주들은 대부분 다양한 유전자패턴을 보였다. 41 cpe 보유균주 중 3개의 균주를 제외하고, 2013년 부천원미구, 성남분당구, 2014년 안산상록구, 평택, 김포, 화성 식중독 모두 각각 동일한 유전자 패턴을 보였다. 2013 수원영통구 식중독은 2가지 cpe 유전형 패턴을 보였다. MLST 분석 결과, 크게 P-cpe 및 cpb2 그룹과 C-cpe 그룹으로 나뉘어 졌고, 세세하게 11개의 cluster로 나뉘어졌다. 경기도에서 분리된 31개 균주 중, 16 cpb2 보유균주와 2014-06-03 cpe 보유균주는 1-7 cluster에 속해있었고, 14 cpe 보유균주는 모두 8-11 cluster에 속해있었다. 하나의 cpe 보유균주를 포함하여 cpb2 보유균주들은 P-cpe 그룹과 건강한 사람에서 분리된 cpb2 그룹들 사이에 산재되어 cluster되었고, cpe 보유균주는 C-cpe 그룹에 속해있었다. 2014-06-03주의 cpe gene은 plasmid에 존재하고, 나머지 cpe 보유균주의 cpe gene은 모두 chromosome에 존재함을 추정 할 수 있었다. PFGE 및 MLST 분석 결과, cpe 보유균주에 비해 cpb2 보유균주가 훨씬 다양하고 복잡한 유전자패턴을 나타내며, cpe 유전자 보유균주의 경우 단일 유전자형이거나 유사도가 높은 유전자형으로 이루어져 있음을 알 수 있었다. cpe 보유균주의 경우 집단식중독의 원인균 파악이 용이하였으나, cpb2 보유균주의 경우 2 발생건을 제외하고 역학적인 연관성이 낮음을 확인 할 수 있었다. Clostridium perfringens is both a ubiquitous environmental bacterium and a major cause of human gastrointestinal disease, and C. perfringens food poisoning ranks among the most common gastrointestinal diseases in developed countries. 120 isolates of C. perfringens were obtained from food-poisoning outbreaks in 2013~2014, Gyeonggi-do. Using PCR, all 120 isolates were identified as C. perfringens type A. Of the tested isolates, 49 isolates carried the cpe gene, 71 isolates carried the cpb2 gene. The outbreak cases of cpb2 and cpe /cpb2 genes were 7 and 7, whereas the outbreak cases of cpe-gene were 2. The epidemiological relationship between C. perfringens isolates has previously been investigated chiefly by pulsed-field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST). The genetics relatedness of the isolates raged from 53.5-100% and 75 district PFGE type were observed. The PFGE results revealed a wide genetic diversity among the 64 cpb2 carrying isolates (except 7 isolates), while 46 cpe-carrying isolates (except 3 isolates) showed a high genetic similarity. The MLST analysis revealed that 14 cpe isolates (cpe-chromosomal isolates) belong to a distinct cluster that is significantly distant from all the other cpb2 isolates (cpe-plasmid carrying and cpe-negative isolates). The isolates carrying a cpb2 appear to be rarely related, and are more variable than chromosomal cpe isolates. The results suggest that the cpe-positive outbreak isolates showed close genetic relation, whereas the cpb2-positive isolates revealed a wide genetic diversity.

낙상 위험 선별검사 Timed Up and Go test의 예측 타당도 메타분석

박성희,이언석,Park, Seong-Hi,Lee, On-Seok 한국의료질향상학회 2016 한국의료질향상학회지 Vol.22 No.2

Purpose: Globally, falls are a major public health problem. The study aimed to evaluate the predictive validity of the Timed Up and Go test (TUGT) as a screening tool for fall risk. Methods: An electronic search was performed Medline, EMBASE, CINAHL, Cochran Library, KoreaMed and the National Digital Science Library and other databases, using the following keywords: 'fall', 'fall risk assessment', 'fall screening', 'mobility scale', and 'risk assessment tool'. The QUADAS-II was applied to assess the internal validity of the diagnostic studies. Thirteen studies were analyzed using meta-analysis with MetaDisc 1.4. Results: The selected 13 studies reporting predictive validity of TUGT of fall risks were meta-analyzed with a sample size of 1004 with high methodological quality. Overall predictive validity of TGUT was as follows. The pooled sensitivity 0.72 (95% confidence interval [CI]: 0.67-0.77), pooled specificity 0.58 (95% CI: 0.54-0.63) and sROC AUC was 0.75 respectively. Heterogeneity among studies was a moderate level in sensitivity. Conclusion: The TGUT's predictive validity for fall risk is at a moderate level. Although there is a limit to interpret the results for heterogeneity between the literature, TGUT is an appropriate tool to apply to all patients at a potential risk of accidental fall in a hospital or long-term care facility.

탁상위의 가속기, 레이저 플라즈마 가속기

박성희,이기태,Park, Seong-Hui,Lee, Gi-Tae 한국광학회 2013 광학과 기술 Vol.17 No.4

설소대의 크기와 운동이 발음에 미치는 영향

박성희,손우성,김용덕,신상훈,김욱규,정인교,권순복,Park, Seong-Hee,Son, Woo-Sung,Kim, Yong-Deok,Shin, Sang-Hun,Kim, Uk-Kyu,Chung, In-Kyo,Kwon, Soon-Bok 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.6

Purpose : The objective of this study is to ascertain whether the positive exists among the frenum length, the tongue movement and the speech and to present the normal range of tongue movement and guidelines for the choice of surgery, observation if necessary. Materials and Methods : 180 patients were evaluated. We divided 180 patients into 6 group by age. Each group was separated as follows; the age of 2.5-4, 5-6, 7-9, 10-12, 16-18. We measured the frenal length, the range of tongue motion and evaluated the speech so that we really questioned about the positive relationship between the tongue-tie and speech. We let the patient exercise the protrusive both(right, left) laterotrusive superior movement of the tongue. During these movements, we measured the distance between the vermilion border and the tongue tip. We also measured the distance from the tongue tip to the point contacting the upper lip with dorsum of the tongue during the maximal protrusive movement of the tongue. Three linear measurement of the anterior, inferior segment of the tongue including the lingual frenum, are made. These measurements are as follows: 1. Distance A. Free anterior portion of the tongue from the point of frenular insertion to the tongue tip. 2. Distance B. The distance from the initiating point of the lingual frenum to the point connecting the two sublingual carundcles to the lingual frenum perpendicularly. 3. Distance C. The distance from the point contacting the line crossing the sublingual caruncles with the lingual frenum to the terminating point of the lingual frenum. We transform three linear measures into a statistical ratio, A/(A-B+C), representing the length of the free portion of the tongue compared with the total sublingual dimensions. In addition, we assessed the speech through Picture Consonant Articulation Test(PCAT) and tried to find out the relationship between the length of the lingual frenum and speech. Conclusion : As people are born, they have small and restricted tongue. As people grow old, tongue motions are more liberate, and unrestricted and they can speak so freely. Therefore we suggest that until age 5, oral and maxillofacial surgeons postpone the surgery if not urgent, evaluate the maximal lingual motions and PCAT according to this article and observe their changes.