워터마킹 영상의 비가시성 개선에 관한 연구

고석만,김형균,오무송 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.2

The use of digital imaging technique and digital contents based on internet has grown rapidly for last several years, and the needs of digital image protection become more important. For the purpose of copyright protection on digital image, the verification of authentication techniques like content authentication, ownership authentication, illegal copy and etc are needed. Digital watermarking, the invisible encryption technique to insert digital watermark into image, the sophisticated perceptual information should be used for providing transparency and robustness of images on watermarking process. In this paper, we implement the algorithm for preventing forged attack, ownership protection and authentication by transforming the wavelet algorithms in frequency domain in terms of human visual system.

전경물체 추출기법을 이용한 부분방전 측정에 관한 연구

고석만,김형균,오무송 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1

Partial discharge is studied widely by manufacture state of insulating material fare and blazing fire diagnosis system of use in phenomenon of part discharge that happen for main cause of dielectric breakdown of equipment for electric power. Use process that draw tree pattern here measuring above zero to study special quality of this electricity tree, real-time processing by image processing is proposed because reproduction of tree blazing fire process drops and pattern of tree is difficult correct quantification of tree growth by existent visual observation by involution. This research presents general process that need in image processing of tree blazing fire, and that remove various noises that happen in above zero by measuring electrical tree dividing background and complete view in measured above zero taking advantage of specially proposed complete view object abstraction techniques effectively and quantification of tree becomes easy naturally, can apply to dielectric breakdown estimate because can chase growth process of tree.

청소년 인터넷 중독증과 우울, 사회적 불안, 또래관계 문제와의 연관성 조사

이명수,오은영,조선미,홍만제,문재석 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.4

연구목적 : 본 연구는 한국 청소년들의 인터넷 사용 현황조사와 더불어 인터넷 중독증과 우울, 사회적 불안, 또래관계 문제등과의 연관성을 알아보고자 하였다. 방 법 : 수원시 소재 고등학교 학생 869명(남/여=371/498)을 대상으로 인터넷 사용과 연관된 기본 설문을 실시하였다. 인터넷 중독여부를 알아보기 위하여 Young의 인터넷 중독척도를 사용하였고 우울증상의 평가는 Beck Depression Inventory(BDI)를 사용하였다. 사회적 불안 및 회피정도는 Social Avoidance and Distress Scale을, 부정적 평가에 대한 두려움 측정은 Fear of Negative Evaluation-Brief척도를 , 또래관계의 문제는 Index of Peer Relations척도를 사용하였다. 인터넷 중독의 현황조사를 위해서 실수와 백분율, chi-square test를 실시하였고, 인터넷 중독증과 우울, 사회적 불안 및 또래 관계 문제의 연관성을 알아보기 위하여 일원변량분석(ANOVA)을 실시하였다. 결 과 : 1) 총 869명의 대상자 중 남학생이 371명(43.7%)이었으며 여학생이 498(57.3%)이었고 평균연령은 16.27세(표준편차=0.82)로 남녀간에 유의미한 차이는 없었다. 2) 총 869명의 대상자중 291명(33.4%)이 인터넷 중독 가능성을 가지고 있는 것이고 나타났고 그 중 18명(2.07%)은 명백한 중독경향이 있는 것으로 나타났다. 본 연구에서는 인터넷중독척도 상위 30%를 중독경향군으로, 하위30%를 정상대조군으로 분류하였다. 3) 인터넷 중독척도 평균점수의 비교를 보면 남학생이 여학생보다 통계적으로 유의미하게 점수가 높음을 알 수 있었고 또 남학생이 여학생보다 중독경향군에 포함되는 비율도 더 높음을 알수 있었다. 을, 정상대조군에서는 정보검색을 상대적으로 더 많이 하는 것으로 나타났으며 게임은 두 집단간에 차이가 없었다. 5) 중독경향군에서 더 우울성향이 높고 외부의 부정적 평가에 더 예민하게 반응하고 또래관계의 문제가 많은 것으로 나타났고 사회적 상황에서의 불안정도는 집단간에 차이가 나지 않았다. 결 론 : 인터넷 중독으로 비교적 명백하게 분류된 비율은 이제까지의 다른 연구조사와 비교하여 볼 때 상대적으로 낮게 나왔으나 중독경향군까지 포함했을 겨우, 조사대상자의 약 30%에서 인터넷과 연관된 문제가 있음을 알수 있었다. 또한 인터넷 과다사용으로 문제가 되는 경우에 우울이나 또래관계등의 문제가 더 심각한 것으로 판명되어 향후 인터넷 사용자체에 대한 중독치료적 접근이외에 동반 정신병리에 대한 치료적 접근이 필요할 것으로 생각된다. Objective : The purpose of this study was to survey the present conditions of adolescents' Internet use and to investigate the relation of Internet addiction to depression, social anxiety and problems in peer relationship. Method : Eight hundred and sixty-nine high-school students(male/female=371/498) were included in the study, each of whom completed a standard questionnaire related to Internet use determined. We assessed internet addiction and depressive symptoms of adolescents using Youngs Internet Addiction Scale and the Beck Depression Inventory(BDI), respectively. Social Avoidance and Distress Scale were employed to measure social anxiety and avoidance. Fear of Negative Evaluation-Brief Scale was for fear of negative evaluation by other people. An Index of Peer relation was devoted to problems in peer relationships. Chi-square test and ANOVA were used to identify the present conditions of Internet addiction and to analyze the relations of Internet addiction with depression, social anxiety and problems in peer relationship. Results : 1) Of these 869 subjects, 371(42.7%) were male students and 498(57.3%) were female. The mean age was 16.27 years(SD=0.82) and there was no significant difference between two sex groups. 2) Of these 869 subjects, 291(33.4%) showed addictive tendency and among them 18 subjects(2.07%) were classified into obvious addiction group. In this study, we defined upper 30% of Internet addiction scores as 'addiction group' and lower 30% as 'normal control group'. 3) Male students had significantly higher mean scores of Internet addiction scale than females and there was significantly higher rates of male students in addiction group. 4) Comparing two groups, there was no statistically significant difference in terms of the preferred types of Internet media, although addiction groups tended to use chatting and E-mail more, normal control group tended to use information search more, And there was no significant difference regarding games on the Internet. 5) There was more depressive tendency in line with more sensitive response against negative-evaluation and more problems of peer relationship in addiction group. However, there was no significant difference regarding anxiety on social situation. Conclusion : Compared to previous studies, findings from this study showed that the rates classified as the group of obvious Internet addiction were relatively lower. However, including those who had tendency of Internet addiction, about 30% of all subjects had problems related to Internet use. In addition, depression or relationship problems were triggered more severely in Internet addiction group. With these findings in mind we finally suggest that therapeutic approach to comorbid psychopathology as well as Internet addiction itself should be required.

Acid Phytase를 생산하는 Pseudomonas fragi의 분리와 phytase의 생산조건

김영진,장은석,인만진,오남순 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.4

cnrtkscP수가 방류되는 단위동물 밀집사육장 인근의 하천수로부터 phytase를 생산하는 세균들 중 활성이 가장 우수한 균주를 분리하여 Paseudomonas fragi Y9451로 동정, 명명하였다. 탄소원으로 fructose를 첨가할 경우에 phytase의 생산능이 가장 우수하였고, 배지에 7% 첨가할 경우에 72시간 배양 후 효소활성이 1,078mU/m로 최대의 phytase생산능을 보였다. 또한, 질소원으로는 nutrient broth(NB)가 적합하였으며, NB를 3%의 농도로 첨가할 경우에 96시간 배양 후 효소활성이 1,425mU/m까지 향상되었다. 인산원인 KH₂PO₄ phytate는 첨가 농도가 높을수록 phytase생산은 억제되었으며, 무기염으로 MgSO₄와 CaCI₂를 첨가하는 경우는 첨가농도와 상관없이 phytase의 생산을 현저히 억제하였다. 산업생산을 목적으로 하는 scale-up에 있어서의 통기교반 효과는 phytase의 생산량에 큰 영향을 미치는 것으로 나타났다. A bacterial strain producing a high level of an extracellular phytase was isolated from livestock waste water, identified as a strain of Pseudomonas fragi and designated as Pseudomonas fragi Y9451. Under the phytase production medium, the activity of phytase reached the highest level after 120 hours of incubation. On the effect of carbon sources on the phytase production, the most favorable carbon source for phytase production was fructose. As for the effect of nitrogen sources, high levels of phytase activity were detected in the medium containing nutrient broth as the nitrogen source. Free PO₄^(3-) inhibited phytase production with increasing concentration of KH₂PO₄ and phytate in the media. The addition of CaCl₂ and MgSO₄ also resulted in the inhibition of phytase production. To investigate the effect of aeration on the phytase production, different volumes of culture broth Erlenmeyer flasks were incubated in rotary shaker at the speed of 200 rpm. As a result, a high level of phytase activity was detected at small volume of culture broth at compared to larger volume because of its more aerobic condition.

애니메이션의 효율적인 동작 제어에 관한 연구

김형균,고석만,오무송 조선대학교 전자정보통신연구소 2003 電子情報通信硏究所論文誌 Vol.6 No.1

본 논문에서는 캐릭터 애니메이션의 효율적인 동작 제어를 위하여 익스프레션을 이용한 애니메이션을 제작하였다. 익스프레션을 이용한 애니메이션은 움직임의 표현에 있어서, 자연스러운 애니메이션을 좀더 쉽고 유용하게 표현하기 위한 방법으로 캐릭터의 동작 제어점들을 분석하여 익스프레션에서 애니메이션을 제어할 수 있는 요소를 찾아 그 식에 사용하였으며, 이것을 토대로 캐릭터의 동작을 자동적으로 제어하는 애니메이션을 구현하였다. 익스프레션에 의한 애니메이션은 간편한 조작으로 자연스럽고 현실적인 움직임을 생성할 수 있다는 익스프레션의 효율성이 장점으로 나타났지만, 애니메이터에 의한 키 프레임 방식에 의한 애니메이션보다는 어색함을 보였다. This paper manufactured animation to use expression for efficient action control of character animation. Animation to use expression is method to express natural animation little more easily and usefully in expression of motion Find urea that could control animation in expression analyzing action control points of character and used in ceremony Embodied animation to control automatically action of character on the basis of this. Efficiency of expression that animation by expression can create natural and realistic action by manufacturing that is simple was expose by advantage, but showed awkwardness than animation by key frame way by animator.

운전 정밀검사의 개발 및 표준화

김명언,김정오,권석만,김청택,이재식 서울大學校 社會科學大學 心理科學硏究所 1998 心理科學 Vol.7 No.2

단기교육으로 시행가능한 심실기능평가법

김원,임경수,오병연,홍은석,김영식,김선만,이부수,현석천,김영득 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: The initial history, physical examination, and ECG assessment should focus on identification of potentially serious noncardiac or cardiac disorders, including coronary artery disease, congestive heart failure, and electrical instability at the emergency room. additionally, it is essential to define disease severity, stability and need for emergency therapy. echocardiography is a useful tool for this purpose. especially Doppler echocardiography may be more sensitive and time-saving diagnostic tool for the evaluation of patients presenting with cardiogenic symptoms. So we evaluate the feasibility of the echocardiographic measurement by emergency physicain after short-term course. Method and Results: Twenty volunteers(10 male, 38.8±9.3 years) were included in the study for measurement of myocardial performance index and established parameters of ventricular function using conventional echo-Doppler methods. Myocardial performance index: (ICT+IRT)/ET, was obtained by subtracting ejection time(ET) from the interval between cessation and onset of the mitral inflow velocity to give the sum of isovolumic contraction time(ICT) and isovolumic relaxation time(IRT). The most of mean values of echocardiogrphic parameters were not significantly different between those of cardiologist and those of emergency physicians(p<0.01). The duration for measuring myocardial performance index was shortest among echocardiographic parameters. the validity of echocardiographic parameters measured by emergency physicians was proved relatively good. Conclusion: It is proved to be feasible for emergency physician to perform echocardiographic evaluation of ventricular function after short-term course

조직 구성원이 보유한 형식지와 암묵지의 조직소유인식에 관한 탐색적 연구

장시영,이정섭,오만석 한국경영과학회 2004 經營 科學 Vol.21 No.1

Today's organizations make every effort to achieve effective knowledge management, under the recognition that knowledge is a powerful, competitive weapon. For knowledge management to be successful, however, not only should knowledge be voluntarily offered by organizational members but also the organizational ownership of knowledge be perceived among members. In this regard, this study explores antecedent factors of organizational ownership of knowledge based on the extension of previous studies. The analysis of two hundred and fifty-five survey data indicates that cohesion of department or team, propensity to share, and task interdependence are significantly related to organizational ownership. The relationship turns out to be stronger with tacit knowledge than with explicit knowledge. Some suggestions are proposed for enhancing effective knowledge management.

Diagnostics of Rotating Machinery using Recursive Bayesian Estimation

Oh, Joon-Seok,Sohn, Seok-Man,Kim, Hee-Soo,Lee, Seung-Cheol,Bae, Yong-Chae Korea Electric Power Corporation 2020 KEPCO Journal on electric power and energy Vol.6 No.1

Since power plant is an important system to provide electricity, it is necessary to monitor it in order to operate safely. Much information related with machine diagnosis exists in written form instead of digital data. So, it causes difficulties of analyzing and finding solutions. Rulebased expert system can provide flexible and effective solutions to users. In this paper, Recursive Bayesian Estimation is applied in order to increase accuracy of solutions.

Expression and phosphorylation analysis of soluble proteins and membrane-localised receptor-like kinases from Arabidopsis thaliana in Escherichia coli

Oh, Eun-Seok,Eva, Foyjunnaher,Kim, Sang-Yun,Oh, Man-Ho The Korean Society of Plant Biotechnology 2018 식물생명공학회지 Vol.45 No.4

Molecular and functional characterization of proteins and their levels is of great interest in understanding the mechanism of diverse cellular processes. In this study, we report on the convenient Escherichia coli-based protein expression system that allows recombinant of soluble proteins expression and cytosolic domain of membrane-localised kinases, followed by the detection of autophosphorylation activity in protein kinases. This approach is applied to regulatory proteins of Arabidopsis thaliana, including 14-3-3, calmodulin, calcium-dependent protein kinase, TERMINAL FLOWER 1(TFL1), FLOWERING LOCUS T (FT), receptor-like cytoplasmic kinase and cytoplasmic domain of leucine-rich repeat-receptor like kinase proteins. Our Western blot analysis which uses phospho-specific antibodies showed that five putative LRR-RLKs and two putative RLCKs have autophosphorylation activity in vitro on threonine and/or tyrosine residue(s), suggesting their potential role in signal transduction pathways. Our findings were also discussed in the broader context of recombinant expression and biochemical analysis of soluble and membrane-localised receptor kinases in microbial systems.