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이용환,조재훈,이상범,김영섭,Lee, Yong-Whan,Cho, Jae-Hoon,Rhee, Sang-Bum,Kim, Young-Seop 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.1
The recent advances in digital imaging and computing technology have resulted in a rapid accumulation of digital media in the personal computing and entertainment industry. In addition, large collections of such data already exist in many scientific application domains such as the geographic information systems (GIS), digital library, trademark imaging, satellite imaging and medical imaging. Thus, the need for content-based retrieval from visual media, such as image and video data, is ever increasing rapidly in many applications.
이용환(Yong-Whan Lee) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.9
Personal media centered on blogs, Twitter, and Facebook has opened up a personal broadcasting area while meeting platforms such as YouTube and Africa TV. Due to the many advantages and disadvantages of personal broadcasting, a study on it was necessary and statistical survey was conducted. The study conducted opinion survey of 118 university students on personal broadcasting. As a result, we are getting news using smartphones and mainly watching videos through YouTube, and watching videos type in the order of games, music videos and sports. Satisfaction rate of video was 72.4%, 80.2% of survey did not use paid services, experiences about personal broadcasting was 96.6% and 90.5% of survey the prospect of person broadcasting of the opinion that “it will be expanded”. The first thing we want to be improved in personal broadcasting is the prevention of abusive language and hate speech. Second, we were reluctant to sensational content. Third, the survey results are the improvement of excessive advertising.
이용환(Yong-Whan Lee),홍명우(Myoung-Woo Hong) 한국컴퓨터정보학회 2012 韓國컴퓨터情報學會論文誌 Vol.17 No.12
본 논문에서는 교육시설내의 CCTV 설치에 따른 대학생의 인식을 조사하고 이를 통해 교육시설내 CCTV에 대한 인지성, 기대성, 수용성 등 다양한 항목을 분석하고자 한다. 이를 위해 기존의 다양한 CCTV 관련 설문을 분석하고 이를 통해 적절한 설문문항 요소를 추출 개발하여 이를 통한 향후 인식변화에 대한 설문조사 연구를 완성하고자 한다. 설문 조사전에 4가지 가설을 세웠으며 설문 결과 첫째, CCTV 설치에 따라 범죄예방 기대효과가 높으며 둘째, 절도 등에 대한 두려움, 폭력범죄에 대한 두려움이 감소되고 셋째, CCTV설치에 따른 인권침해부분을 감수하겠다는 의견이 높게 나타났고 넷째, 계열별 CCTV 인지에 대한 차이가 있었다. 또한 설치장소에는 조사에서는 학생편의시설내 설치에 부정적 의견이 많았다. 본 연구로 단순한 설치여부에 대한 찬반을 조사하는 설문이 아니라 최종적으로 개발된 설문에 의해 교육시설 내 CCTV에 대한 설치효과에 대한 다양한 가설의 검증과 인식의 변화를 효과적으로 파악하는 설문양식을 새롭게 제시하게 되었다. The purpose of this paper is to analyze various categories such as the recognition, expectation and acceptability of CCTV use in educational facilities by doing a survey on how college students think about the CCTV installed in educational facilities. For this research, diverse existing surveys regarding CCTV were examined, and the appropriate elements of survey questions were extracted and developed. Based on this method, we intend to complete a survey study hereafter on the change in perception regarding CCTV inspection. We made four hypotheses before the survey and the results of the survey are as follows: First, the expectations for CCTV's ability to reduce crime were high. Second, the fears about being a victim of theft or violence crime were decreased. Third, there were a number of respondents who would weigh more on increased safety by installing a CCTV rather than be concerned that CCTV may lead to the violation of students' human rights. Fourth, there showed a difference in recognizing CCTV among three groups. Also, for the questions regarding the places where CCTV is installed, there were many negative opinions on its installation in the student convenient facilities. What we have achieved was not a simple survey which investigates the pros and cons about CCTV use, but a newly suggested way of survey, which enables us to test various hypotheses and figure out the changing perceptions on CCTV effectiveness in educational facilities with more efficiency.
A Study on Cognition about Copyright of Digital Works
Yong-Whan Lee(이용환) 한국컴퓨터정보학회 2017 韓國컴퓨터情報學會論文誌 Vol.22 No.5
Digital works such as computer programs, music, photographs, movies and dramas are copyrighted. Even if there were more than 1,000 violations per year for digital works, the punishment was very weak. Especially copyright infringement by teenager is increasing. This study aims to present the direction of future development through questionnaires on the perception and direction of college students about copyright. 157 college students were surveyed about copyright awareness, perception of detailed legal provisions, cost of monthly expenses, copyright violation, and direction of copyright protection. As a result of the questionnaire survey, awareness was high at 69%, but in detailed law was low at 17.2% and 22.3%. In the future direction of copyright policy, 72.6% of them answered that they should be "strengthened" and "more and more strengthened". In order to protect copyrights, enforcement of crackdowns, public relations activities, expansion of the legal market, and technical protection should be done. In order to do this, copyright-related education for elementary, middle, high school and college students are needed more and it is necessary to expand the legal market where high quality contents are traded. More research is needed on copyright protection technological methods.
이용환(Lee Yong Whan),박장춘(Park Jang Chun) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.10
Image processing steps are consist of image acquisition, processing, region, segmentation and recognition. But image corrupted commonly by noise during data transmission. In noise reduction methods, many filters were proposed like mean filter, median filter, weighted median filter, Cheikh filter, and Kyu-cheol Ice filter as spatial noise reduction filtering. We propose a new edge detection algorithm so that we find out edge existence and nonexistence. In non edge area, we selectively apply weighted median filter based upon using information of difference value between weighted median filter's value and center pixel's value. As a result, we finally prove a better performance of noise reduction by applying adaptive weighted median filter and improvement of processing time through using simple algorithm.
이용환(Yong-Whan Lee),서민형(Meen-Hyung Seo),우상근(Sang-Keun Woo),박장춘(Jang-Chun Park) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
Impulsive noise appears as black and/or white spots in an image. It is usually caused by errors during the image acquisition or transmission through communication channels. This paper presents a study on the impulsive noise reduction filter of digital image. A much more effective method for removing impulse noise is weighted median filtering. But it loses some information by changing center value with no condition. We propose some new technique to change center value with some conditions In this paper, the performance of conditional weighted median filter is compared to the commonly used median filter, mean filter, max/min filter, and weighted median filter, A Quantitative comparison is performed on MSE (Mean Square Error), RMSE (Root Mean Square Error), and SNR (Signal to Noise Ratio). Proposed conditional weighted median filter can yield better performance than regular filters.
소방이 형성된 결핵성 흉막염 환자에서 경피적 도관을 이용한 유로키나제 치료의 효과; 전향적 무작위연구
이용환 ( Yong Whan Lee ),곽승민 ( Seung Min Kwak ),권미영 ( Mee Young Kwon ),배인영 ( In Young Bae ),박찬섭 ( Chan Sup Park ),문태훈 ( Tae Hun Moon ),조재화 ( Jae Hwa Cho ),류정선 ( Jeong Seon Ryu ),이흥렬 ( Hyong Lyeol Lee ),노 대한결핵 및 호흡기학회 1999 Tuberculosis and Respiratory Diseases Vol.47 No.5
이용환 ( Yong Whan Lee ),송정수 ( Jung Soo Song ),박원 ( Won Park ),배성권 ( Sung Kwon Bae ),김범수 ( Bum Soo Kim ) 대한류마티스학회 2000 대한류마티스학회지 Vol.7 No.2
Dermatomyositis (DM) is an inflammatory disease of muscle and skin mediated by autoimmune events that affects skeletal muscle resulting in proximal muscle weakness and sometimes chronic disability. The potential pulmonary complications of DM are interstitial lung disease (ILD), aspiration pneumonia and respiratory muscle dysfunction. ILD occurs in 5% to 30% of patients with DM depending on radiographic or physiologic methods. Respiratory failure resulting from myositic involvement of the respiration controlling muscles is a rare event in patients with DM. A 17-years-old woman visited emergency room with complaint of dyspnea developed 3 days ago. Her eyelids showed heliotroph rash and her fingers showed Gottron`s papules. She had severe proximal muscle weakness. Her respiration was fast and shallow. We diagnosed her having DM with acute respiratory failure due to respiratory muscle weakness. During hospitalization, she was suffered from recurrent aspiration pneumonia as a conseqeunce of pharyngeal muscle weakness. She improved after mechanical ventilation, antibiotics and immunosuppressive therapies.