횡방향 진동에 의한 볼트 풀림 해석

남주현(J. H. Nam),김동원(D. W. Kim),오제훈(J. H. Oh) Korean Society for Precision Engineering 2019 한국정밀공학회 학술발표대회 논문집 Vol.2019 No.5월

문화재의 디지털복원을 위한 3D애니메이션 사례연구

남주현(Ju Hyun Nam) 한국디자인문화학회 2013 한국디자인문화학회지 Vol.19 No.4

문화재의 디지털복원은 선진국을 중심으로 세계적 추세이다. 경주시와 문화재청은 “경주 문화융성 프로젝트”를 계획하여 신라왕경의 모습을 실물복원하려고 추진 중이다. 실물복원 시 선행되는 디지털복원의 산물인 영상콘텐츠는 일반적으로 3D애니메이션 형식의 복원영상으로 제작된다(이하 ‘복원영상’의 의미는 3D애니메이션형식으로 제작된 영상 콘텐츠임을 밝힌다). 복원영상은 실물복원에 앞서 결과를 예측하고 대중에게 홍보하기 위한 도구로 활용되며 교육적 가치도 크다. 하지만 허구적 사실이 허용되는 영화와 달리 고증과 재현의 인과관계가 그릇된 표현으로 복원된 영상콘텐츠는 역사왜곡이라는 문제점을 야기할 수 있다. 또한, 디지털테크놀러지의 발전은 영상콘텐츠를 향한 관객의 기대수준과 비례한 반면, 기존에 제작된 복원영상의 시각적 리얼리티는 문화재의 대중적 기대를 극대화시키기에 부족하다. 이에 본 논문은 문화재의 복원영상이 학술적 대중적 가치기준에 부합하는 영상콘텐츠로 제작될 수 있도록 제언하기 위하여 진행되었다. 참고 문헌 및 선행연구를 통해 문화재의 디지털복원 및 리얼리티의 이론을 고찰하여 프로덕션 단계에서 발생하는 문제점을신라 월성 홍보전시관의 ‘천년왕국의 부활’ 제작사례를 통해 연구하였다. 분석의 이론적 근거로 카이스트문화기술센터 디지털 헤리티지 그룹의 “디지털복원에기반한 영상콘텐츠 프로덕션의 파이프라인 연구” 논문 중 프로덕션 제작 단계의 파이프라인 누수요인과 조선대학교 디자인대학원의 ‘SFX에서 비주얼 리얼리티 요소에 관한 연구’ 논문을 활용하였다. 복원영상의 시각적 리얼리티를 위한 구현 요소를 조형, 키네틱, 상태 및 공간의 요소로 정의하고 ‘천년왕국의 부활’복원영상에 표현된 리얼리티 구현 요소와의 관계 분석을 위해 3D애니메이션 제작과정을 건축물, 캐릭터, 모션캡처, 렌더링과 컴포지팅(Compositing)으로 세분화하고 적용사례를 정리하였다. 분석내용을 간략히 정리하면 조형적 리얼리티를 위해 신라왕경의 주요건축물을 고증자료에 의거하여 모델링하고 월성을 중심으로 배치하였다. 또한 캐릭터 개발에 필요한 신라인의의복문화 자료를 수집하여 20여종의 캐릭터에 적용하였다. 키네틱 리얼리티를 위해 생동감 있는 동작 연출을 광학식 모션캡처 기술과 클로스 시뮬레이션으로 표현하였다. 마지막으로 상태 및 공간 리얼리티를 위해 멘탈레이(Mental ray) 렌더링과 레이어 컴포지팅 기법을 활용하였다. 이에 따른 결과로 문화재의 복원영상은 학술적 가치기준에 입각한 고증절차의 내실화를 토대로 시각적 리얼리티에 기반하여 대중의 기대에 부응하는 영상콘텐츠로 제작되어야 할 것이다. 이러한 노력이 영상콘텐츠제작에 활용되어 역사적 교육적 가치를 충족시키는 복원영상이 양산된다면 세계적수준의 문화유산 선진국으로 나아가는 밑거름이 될 것으로 기대한다 Cultural Assets Digital Restoration is a globaltrend in developed countries. The Gyeongju City andCultural Heritage Administration is planning ‘GyeongjuCity cultural prosperity project’, that is to actualrestoration of ‘Silla`s Capital’. The media contents, a product of the digitalrestoration is followed by the actual restoration into 3DAnimation(From the following, meaning of ‘TheRestored Image’ is a media contents that was productedinto 3D Animation). In addition, that is used as a toolto promote to the public and for predicts to results. Inthe case of films, fictional restoration is allowed. Whilein the case of incorrect The Restored Image, the causalrelationship between historical research andrepresentation can cause the issue distortion of history. Also, the development of digital technology isproportional to the expectations of the audience, whileThe Restored Image of visual reality that is previouslypublished work, not enough to maximize the publicvalue of cultural property. Therefore, this study is consistent with the valueof academic and popular content production was carriedout in order to suggest. In this study, references andprevious research were investigated through thetheoretical. From the research of ‘The Resurrection ofthe Millennium’ production practices in Silla WolsungFilm Exhibit hall. This study investigated the problemsthat occur at the production stage. As the basis for thetheoretical analysis, this study used the Productionstage in a production pipeline leakage factor of “A studyon pipelines of a media content production based ondigital reconstruction” research paper by the digitalheritage group in research center and “A Study on theFactors of Visual Reality in SFX” by Graduate Schoolof Design, Chosun University. Elements for theimplementation of visual reality was defined that isFormative, Kinetic, State & Space to analyze therelationship with the implementing elementsrepresented in the ‘The Resurrection of the Millennium’ restoration image, this study was subdivided theproduction process into Structure, Character, MotionCapture, Rendering, and Compositing. And examples ofthe application was described. In summary, mainbuildings of Silla`s Capital were shaping from historicalresearch data and then the Wolsung was placed in thecenter for formative reality. The Silla clothing culturematerials for the development of character werecollected. And about 20 species on the basis it wasapplied to the characters. Optical motion capture andCloth simulation for a lively representation of themotion was directed. Finally, mental ray rendering andlayer compositing used for the state and space reality. As the results, the cultural restored image assetsto meet the expectations of public should be made tomedia contents from the procedure on the basis ofacademic historical research and visual reality. If theseeffort are utilized to produce the media contents forcultural heritage restoration, historical and educationalvalue of the new audiovisual production, a world classcultural heritage of our country moving in developedcountries will be the foundation.

Laparoscopico-Vaginal Radical Hysterectomy in Patients with Cervical Cancer

남주현 ( Joo Hyun Nam ) 대한산부인과학회 2002 대한산부인과학회 학술대회 Vol.88 No.-

저 조도에서 동작하는 전류거울 회로를 사용한 CMOS 이미지 센서 픽셀

남주현(Juhyun Nam),조경록(Kyoungrok Cho) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

Since the conventional pixel has a deficit that it could not sense a thing under low light level environment, the novel architecture that CIS which includes current mirror circuit at photo-diode node is proposed. The amount of current flow by the photo-charge is amplified by utilizing the current mirror in order to improve output performance at the same light level, when comparing with the conventional ones. The proposed pixel in the paper is simulated with Hynix standard 0.18 um CMOS process. Under the light intensity of 0.01 lx, which causes photocurrent of 10 pA, the proposed architecture denotes slope of 200 mV/ms at output.

A/V Session : The Laparoscopic radical trachelectomy

남주현 ( Joo Hyun Nam ) 대한산부인과학회 2004 교육강연 Vol.2004 No.-

나사산의 형상에 따른 Self-Tapping Screw의 체결 거동 분석

남주현(Juhyun Nam),오제훈(Je Hoon Oh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

The metal tapping screws are mainly used to fasten polymer materials. Since the polymer clamped parts are weaker than the metal screw, the joint performance is mainly affected by the material properties and shapes of clamped part. However, it is not simple to change the material. Therefore, research have been conducted to improve the performance of joints by varying the thread shape. Though, it is not efficient to manufacture the designed screw to evaluate the joint performance because of the cost. In this study, we suggest an efficient way to comparing the fastening performance with respect to different materials and thread shapes via finite element analysis (FEA). The experiments were also conducted to validate the FEA. The calculated stripping torque via FEA shows only ±5% error compared to the experimental results. Additionally, we compared the fastening behavior and the joint performance with respect to the five threads of different shapes.

AITSC-NET: COVID19 진단을 위한 밝기보정, 객체 분할 및 분류 신경망

남주현(Ju-Hyeon Nam),김수정(Su-Jeong Kim),이상철(Sang-Chul Lee) 한국정보과학회 2020 한국정보과학회 학술발표논문집 Vol.2020 No.12

A/V Session : Comprehensive Surgical Staging in Ovarian Cancer Patients -Paraaortic Lymph Node Dissection

남주현 ( Joo Hyun Nam ) 대한산부인과학회 2002 교육강연 Vol.2002 No.-

자궁경부 미세침윤암 221 예의 임상적 분석

남주현(Joo Hyun Nam),김성훈(Sung Hoon Kim),김종혁(Jong Hyeok Kim),김용만(Yong Man Kim),김영탁(Young Tak Kim),목정은(Jung Eun Mok) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10

N/A Objective : To review and evaluate a series of patients who underwent surgical management due to microinvasive cervical cancer Materials and Methods : Records of 221 patients with microinvasive cervical cancer treated in Asan Medical Center (AMC) from June 1989 to December 2000 were reviewed. Demographic profile, findings in preoperative work-up, treatment modality, histologic findings and post-treatment clinical course were evaluated. Results : The age range at initial operation was 27 to 79 and the mean age was 44.5±11.4 (mean±SD) years. Patients were followed from 3 months to 11.7 years with median follow-up interval of 4.5 years. According to the pathologic report, 212 cases (95.9%) were diagnosed as squamous cell carcinoma and 9 cases (4.1%) as adenocarcinoma. The number of patients with FIGO stage Ia1 and Ia2 disease was 202 (91.4%) and 19 (8.6%), respectively. The cases with invasion of ≤ 1 mm, > 1 mm but ≤ 3 mm, and > 3 mm but ≤ 5 mm were noted in 120 (54.3%), 82 (37.1%), and 19 (8.6%) patients, respectively. Pelvic lymph node dissection (PLND) was performed in 140 patients and the average number of lymph nodes examined per case was 21±7. None of the 140 patients had metastasis to pelvic lymph node. Lymphovascular space invasion was identified in 7 patients. Pelvic recurrence was developed in only one patient and none of the 221 patients has died from recurrent disease. Conclusion : This study shows that patients with microinvasive cervical cancer have no pelvic lymph node metastasis, rare recurrence, and very excellent prognosis, so, if indicated, conservative management or non-radical surgery excluding pelvic lymph node dissection could be tried.

만삭임신에 있어서 Prostaglandin(PG) E2 질정투여후 혈중 PG F2 치의 변동

남주현(CH Nam),김승욱(SW Kim) 대한산부인과학회 1987 Obstetrics & Gynecology Science Vol.30 No.12

분만진통과정에 있어서의 PG F2 의 역할을 판명하기 위하여 유도분만을 필요로 하는 자궁경관 숙화상태가 좋지 않은 만삭임신 41예에서 PG F2 질정을 투여한 후 방사면역측정법을 이용하여 혈중 PG F2 치를 측정, 분만의 진행에 따른 변동을 관찰하였다. 다른 5예는 placebo로 Betadine질정을 투여하여 대조군으로 삼았다. 채혈은 질정투여 직전, 3시간, 6시간, 9시간 및 24시간 후에 시행하였으며, 24시간내에 분만에 성공한 예에서는 분만직전에 채혈하였다. 1. 대조군과 분만성공군 그리고 실패군 간에 년령분포나 임신주수 및 분만회수 그리고 PG F2 질정투여전 Bishop score에는 유의한 차이가 없었다. 2. Placebo를 투여한 대조군의 혈중 PG F2 치는 24시간 동안 변동이 없었다. 3. 분만성공군에서는 PG F2 질정투여 3시간의 혈중 PG F2 치가 184.4pg/ml로 투여전 118.1pg/ml보다 약간 상승한 다음, 6시간 후 263.9pg/ml로 유의한 증가를 보이기 시작하여 자궁경관개대에 비례하여 계속상승, 분만직전에 518.4pg/ml로 최고에 달하였다. 4. 분만실패군에서는 PG F2 질정투여 4시간 후 혈중 PG F2 치가 181.2pg/ml로 분만성공군과 비슷하게 약간 상승 하였으나 그 후 점차 떨어져서 24시간후에는 128.6pg/ml 투여전의 혈중치와 유이하였다. 5. 이상의 결과로 미루어 보아 혈중 PG F2 의 일시적인 증가로는 분만의 진행에 효과가 없고 지속적이며 유의한 증가만이 유효한 진통을 유발시켜 분만에 이르게 되는 것으로 사료된다. In order to elucidate the role of prostaglandin(PG) F2 in human labor, the concentration of PG F2 were measured by radioimmunoassay in the peripheral blood of 41 women with low Bishop score in whom labor were induced with PG F2 vaginal suppository. In another 5 women(control group), Betadine vaginal suppositories were inserted as a placebo. Blood samples were taken before and at 3, 6, 9 and 24 hours after the application of vaginal suppositories. In induction success group, blood samples were also taken just before the delivery. The results were as follows; 1. Age distribution, gestational period and parity of subject in each group as well as the Bishop scores before the application of vaginal suppository were not significantly different. 2. In control group, no significant changes in serum PG F2 levels were observed during 24 hours after placebo application. 3. Serum PG F2 levels in induction success group began to increase from 3 hours after the application of PG F2 vaginal suppository, and the value reached to 263.9pg/ml at 6 hours after the application which is significantly higher than the pre-insertion level. PG F2 level continued to rise in parallel with the cervical dilation and the highest level, 518.5pg/ml was obtained just before the delivery. 4. In induction failure group, slight increase in PG F2 level at 3 hours after PG F2 application was observed, however the level gradually declined and return to pre-insertion level after 24 hours. 5. Therefore, it is concluded that the transient increase of serum PG F2 level is not effective in inducing successful labor, and the significant and continued increase in serum PG F2 level is necessary for the progress of successful labor.