삼차동맥존속증을 동반한 정중엽 다리뇌경색

하윤석,김명국,유봉구 고신대학교 의과대학 2010 고신대학교 의과대학 학술지 Vol.25 No.2

Persistent trigeminal artery (PTA) is the most frequently observed fetal anastomosis between the carotid and vertebrobasilar circulations. PTA is usually associated with hypoplasia or aplasia of the vertebrobasilar artery. A 56-year-old woman presented with right hemiparesis and dysarthria. Brain MRI showed acute infarction in the right paramedian pons. CT angiogram revealed right persistent trigeminal artery and hypoplasia of the proximal basilar artery

건강질단 질병 유소견자들의 순천향구미병원 외래이용에 영향을 미치는 요인

김진석,우극현,함정오,유재영,최태성,하봉구,윤성용 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

Background ; The purpose of routine health screening of employee is not only to detect worker's disease at early stage but also to provide early appropriate health service. But, majority of patients who diagnosed by routine health screening haven't underwent health service utilization. Soonchunhyang Kumi Hospital had been provide total occupational health service in kumi industrial estate including health screening, worker interview at workplace by occupational nurses and doctors. Object ; We want to know how much proportion of patient who are diagnosed by routine health screening had visited Soonchunhyang Kumi hospital out-patient clinic and factors influencing such health care service utilization. Method ; Initial study subject were 189 workers who had proved to have hypertension, diabetes mellitus, hyperlipidemia in routine health screening which performed during year of 2000. Among those, 160 workers who had finished questionnaire were selected for final study subject. We investigate whether they had visited health services or not, if they had, what kind of health care facility they visited, and other factors which influencing their health service utilization. Result ; Among 160 workers, 59(36.9%) had visited Soonchunhyang Kumi hospital, 47(29.4%) had visited other health care facility, and 54(33.8%) had not went to any health care facility. Factors which influencing Soonchunhyang Kumi hospital utilization is sex, job, staff's support to hospital visit during worktime, history of medical consultation about health screening result.

Blind Post-Processing for Ringing and Mosquito Artifact Reduction in Coded Videos

Seok Bong Yoo,Kyuha Choi,Jong Beom Ra IEEE 2014 IEEE Transactions on Circuits and Systems for Vide Vol.24 No.5

<P>Block-based video-coding standards produce unwanted spatial and temporal artifacts in reconstructed videos. Among them, ringing and mosquito artifacts arise due to the quantization of high-frequency discrete cosine transform coefficients. Most of the existing artifact-reduction algorithms assume that coding information such as a standard quantization table and the corresponding quantization parameter for each block are available. In many multimedia applications, however, external video inputs are usually supplied without coding information. To effectively reduce the ringing and mosquito artifacts in a decoded input video sequence, it is necessary to control the filter strength block by block. In this paper, we present a blind block-based method to estimate the quantization amount and propose a novel post-processing algorithm based on the visibility of artifacts in terms of the human visual system using the estimated quantization amount. Experimental results demonstrate that the proposed algorithm better alleviates ringing and mosquito artifacts in various coded videos compared with the existing algorithms.</P>

Efficient Texture Creation Based on Random Patches in Database and Guided Filter

YOO, Seok Bong,HAN, Mikyong 'Institute of Electronics, Information and Communi 2018 IEICE transactions on information and systems Vol.101e.d No.11

Temporal matching prior network for vehicle license plate detection and recognition in videos

Yoo, Seok Bong,Han, Mikyong Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.3

In real-world intelligent transportation systems, accuracy in vehicle license plate detection and recognition is considered quite critical. Many algorithms have been proposed for still images, but their accuracy on actual videos is not satisfactory. This stems from several problematic conditions in videos, such as vehicle motion blur, variety in viewpoints, outliers, and the lack of publicly available video datasets. In this study, we focus on these challenges and propose a license plate detection and recognition scheme for videos based on a temporal matching prior network. Specifically, to improve the robustness of detection and recognition accuracy in the presence of motion blur and outliers, forward and bidirectional matching priors between consecutive frames are properly combined with layer structures specifically designed for plate detection. We also built our own video dataset for the deep training of the proposed network. During network training, we perform data augmentation based on image rotation to increase robustness regarding the various viewpoints in videos.

Post-Processing for Blocking Artifact Reduction Based on Inter-Block Correlation

Seok Bong Yoo,Kyuha Choi,Jong Beom Ra IEEE 2014 IEEE transactions on multimedia Vol.16 No.6

<P>Block-based coding introduces an undesirable discontinuity between neighboring blocks in reconstructed images. This image degradation, referred to as blocking artifacts, arises mainly due to the loss of inter-block correlation in the quantization process of discrete cosine transform coefficients. In many multimedia broadcasting applications, such as a television, decoded video sequences suffer from blocking artifacts. In this paper, we present a novel post-processing algorithm based on increment of inter-block correlation aimed at reducing blocking artifacts. We first smooth the three lowest frequency discrete cosine transform (DCT) coefficients between neighboring blocks, in order to reduce blocking artifacts in the flat region, which are most sensitive to the human visual system. We then group each edge block and its matched blocks together and apply group-based filtering to increase the correlation between grouped blocks. This suppresses blocking artifacts in the edge region while preserving details. In addition, the algorithm is extended to reduce flickering artifacts as well as blocking artifacts in video sequences. Experimental results show that the proposed method successfully alleviates blocking artifacts in both images and videos coded with low bit-rates.</P>

스크린도어의 장애물 검지를 위한 Area센서와 다중공간분할 3D센서의 검지율 비교 분석

유봉석(Bong Seok Yoo),이현수(Hyun Su Lee),진주현(Ju Hyun Jin),김종식(Jong Sik Kim) 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.6

승강장에는 승객의 안전사고를 방지하기 위하여 스크린도어를 설치하고 있으며 스크린도어에는 장애물 검지를 위해 Area센서를 설치하고 있다. 그러나 먼지, 햇빛, 눈, 벌레 등으로 인한 스크린도어의 빈번한 동작오류가 원활한 열차운행을 방해하고 있어 장애물 감지 센서의 동작오류 감소와 장애물 검지 기능을 고도화하기 위한 대체 검지기의 연구가 필요하다. 본 논문에서는 대구 문양역에 시범운영 중인 로프타입 상하개폐식 스크린도어에 Area센서와 장애물검지 다중공간분할 검지알고리즘을 적용한 3D센서를 설치하여 검지 데이터를 수집하고 CCTV를 이용한 영상데이터 판독결과를 비교하였다. 3D 센서의 장애물 검지율은 약 86.91%로 Area센서의 약 78.88% 대비 장애물 검지율이 6.87∼9.79%가 더 높아 설치비용의 절감과 검지성능을 개선한 3D 센서의 적용 가능성을 확인 할 수 있었다. A subway platform is equipped with screen doors in oder to avoid accidents of passengers, where Area sensors are installed for detecting obstacles in the screen doors. However, there exist frequent operating errors in screen doors due to dusts, sunlight, snow, and bugs. It is required to develope a detection device which reduces errors and elaborates detection function. In this paper, we compared the detection rates of the Area sensor the 3D sensor using CCTV-based image data with installing sensors at the screen door in Munyang station Daegu, where 3D sensor is applied with the space division multiple detection algorithms. It is measured that the detection rate of 3D sensor and Area sensor is approximately 89.61% and 78.88%, respectively. The results confirmed that 3D senor has higher detection rate compared with Area sensor with the rate of 6.87~9.79%, and 3D sensor has benefit in the aspect of installation fee.

Poster Session : PS 0267 ; Gastroenterology : Urea Breath Test and Serological Test Have Equivalent Accuracy to Detect Helicobacter pylori in Patients with Gastroduodenal Ulcer Bleeding

( Min Seok Yoo ),( Yun Ju Jo ),( Jun Bong Kim ),( Tae Kyun Kim ),( Sang Bong Ahn ),( Young Kwan Jo ),( Byoung Kwan Son ),( Seong Hwan Kim ),( Young Sook Park ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Backgrounds: In case of bleeding, previous medications or low bacterial load, accuracy to Helicobacter pylori (H. pylori ) tests can be decreased. This study aimed to compare a diagnostic accuracy of the four H. pylori tests (rapid urease test(RUT), C13-urea breath test (UBT), serology and histology) in gastroduodenal ulcer bleeding. Methods: From March 2008 to February 2013, we enrolled a total of 204 patients with gastroduodenal ulcer bleeding consecutively. All patients were performed the esophagogastroduodenoscopy within 48hrs at admission, and got at least two tests to detect H. pylori infection. Logistic regression with generalizedestimating equation method was used to compare sensitivity or accuracy among tests. Results: The mean age of the patients was 64. 1±15. 4, and the gender distribution was 148 males and 56 females. Comparison of sensitivity and accuracy to detect H. pylori in patients with ulcer bleeding summarized in table. There was no difference of sensitivity or accuracy between UBT and serology (p=0. 86). Sensitivity or accuracy of RUT and histology decreased signifi cantly to compare with UBT or serology. When RUT was gotten in two different sites, its accuracy was not inferior to UBT or serology. Conclusion: This study recommand to test UBT or serology for determining the presence of H. pylori infection in patients with gastroduodenal ulcer bleeding in even high H. pylori prevalence area. If RUT is performed, it should be tested in two different sites.

고속도로 중앙하이패스차로 안전성 개선에 관한 연구 : 서울외곽순환고속도로 본선영업소를 중심으로

유봉석(Yoo Bong-Seok),이수범(Lee Soo-Beom),박완용(Park Wan-Yong),도현구(Do Hyun-Gu) 대한토목학회 2010 대한토목학회논문집 D Vol.30 No.1D

고속도로 영업소의 경우 하이패스차량과 일반TCS이용차량간의 혼용 및 차로변경으로 인한 상충이 발생하는 구간으로 안전성에 대한 검토가 필요한 구간이다. 본 연구에서는 영업소 진출부에 설치된 중앙하이패스 이용차량과 일반차로 이용차량간의 상충 및 사고위험성을 현장비디오촬영 및 상충분석을 통해 알아보았다. 차량속도와 상대속도 및 상충으로 인한 차량 감속시간 등을 분석한 결과 하이패스이용차량과 일반TCS이용차량간의 상대속도가 클수록 상충으로 인한 차량 급감속이 발생한다는 문제점을 파악하였으며, 중앙 하이패스 설치시 상충 발생 위치 및 차로 운영형태에 따라 상충빈도 및 상대속도가 다름을 확인할 수 있었다. TA(Time to Accident)분석 결과, 고속도로 영업소 중앙 하이패스 설치시 차량간 상대속도, 상충위치 및 빈도에 따른 상충시 하이패스 차량의 급감속 및 감속시간이 큼에 따라 사고위험이 높은 것으로 분석되었다. 또한 합류 시점부가 영업소 진출부와 가까울수록 TA분석값이 낮은 것으로 분석되어 전반적으로 속도차이를 줄여 안전성을 증대시켜야 함을 알 수 있었다. 본 연구에서는 영업소 진출부 중앙 하이패스 설치로 발생하는 상대속도차에 의한 상충으로 급감속 및 사고를 억제함으로서 영업소 중앙 하이패스 차로 설치시 안전성을 높여줄 수 있을 것으로 기대된다. Safety improvement has been a continuous challenge, especially at toll gate of express highway where traffic conflict often occurs due to frequent lane change by drivers of "Hi-pass" lane and regular "TCS" lane. As a part of research on safety at toll gate, this study videotaped traffic conflict data between vehicles using centrally located "Hi-pass" lane and regular "TCS" lane and analyzed accident risk. According to the correlation analysis of vehicle speed, relative vehicle speed, and sudden vehicle deceleration rate due to traffic conflict, when the relative vehicle speed between centrally located "Hi-Pass" lane and regular "TCS" lane increases, sudden vehicle deceleration rate also increases. One of the findings is that centrally located "Hi-pass" lane at toll gate shows different location for traffic conflict, and frequency of traffic conflict and the relative vehicle speed was also different based on vehicle lane use. TA (Time to Accident) analysis shows that accident rate is high at toll gate where "Hi-pass" lane is installed in center lane, when the occurrence of sudden vehicle deceleration and deceleration time of vehicles rise for vehicles on "Hi-pass" lane. Furthermore, if the expressway entrance/exit point is closely located to toll gate, TA showed a low value. Thus, it is necessary to reduce the relative vehicle speed in order to improve safety. The Study presents reduction of the relevant vehicular speed and prevention of accidents at the centrally installed "Hi-pass" lane as an important strategy for safety improvement at toll gate.

뉴스 포털에서의 기사형 광고의 효과 요인에 관한 연구

유봉석(Bong Seok Yoo),정일권(Irkwon Jeong) 한국정보사회학회 2018 정보사회와 미디어 Vol.19 No.1

뉴스 포털 사이트를 중심으로 온라인 기사형 광고와 연관된 소비자 피해 사례가 늘어나고 있다. 이와 관련된 법정소송에서는 소비자가 메시지의 기망(欺罔)성을 인지하지 못해 발생한 피해에 따른 손해배상 책임의 대상이 쟁점이 되고 있다. 이 연구에서는 실제법정 소송으로 이어졌던 사례인 온라인 쇼핑몰 ‘하이플러스프라자’의 온라인 기사형 광고 메시지를 활용하여 실험연구(n=80)를 진행했다. 실험 집단을 뉴스 포털의 ‘뉴스란’에 노출된 집단과 ‘검색 결과’에 노출된 집단으로 나눈 후 두 집단을 비교하여 수용자들이 메시지의 기망성을 인지하지 못하는 것이 인터넷 공간의 특성 때문인지 뉴스 포털의 뉴스제시 환경 때문인지를 탐색했다. 그리고 수용자들이 메시지의 기망성을 인식한 후 해당 메시지를 게재한 언론사와 뉴스 포털에 대한 태도가 악화되는지를 조사했다. 연구 결과, 메시지의 처리시간과 수용자의 기억 그리고 광고 상품 구매 의도와 메시지의 질에 대한 평가에서 두 집단 간 차이는 발견되지 않았다. 이는 온라인 환경에서는 형식에 관계없이 기사형 광고가 노출 환경적 요인에 의해 신뢰를 확보하게 됨을 시사한다. 그리고 메시지를 전달한 언론사와 뉴스 포털에 대한 수용자의 신뢰도는 기망성을 인식한 후 급격히 하락했는데 이는 앞으로 기사형 광고로 인한 피해의 배상 책임 논란에서 뉴스 포털이 자유롭지 않음을 시사한다. Online consumer damage cases related to Online Transformational Editorial(OTE) are increasing mainly in news portal sites. In the related lawsuits, consumers are not aware of the deceptive nature of the message, and the subject of liability for damages caused by the damages is the issue. In this study, we carried out an experimental study (n = 80) using OTE message of the online shopping mall "High plus plaza" which led to actual court litigation. The experimental group was divided into the group exposed to the news bulletin of the news portal and the group exposed to the information search result. The comparison of the two groups showed that the inability of the audience to perceive the message of the news presentation environment. And, after the participants recognized the nuance of the message, it was investigated whether the attitude toward the media and news portals that posted the message deteriorated. As a result of the study, there was no difference between the two groups in the evaluation of the processing time of the message, the memory of the audience, the purchase intention of the advertisement product and the quality of the message. This suggests that, regardless of the format, online advertisements can gain trust by the exposure environment factors in Internet. In addition, the credibility of the media and news portals that conveyed the message dropped sharply after recognizing their deceitfulness, suggesting that the news portals are not free from the controversy over the liability to compensate for the damage caused by the articles.