디지털 워터마킹을 이용한 영상 정보 보호 시스템

박정빈,정성환,이우선 國立 昌原大學校 精報通信硏究所 1999 精報通信論文集 Vol.3 No.-

Recently, with advance in computer network and multimedia technology, digital media is rapidly proliferating, and digital copy has been widely practiced. So an efficient technology for the protection of intellectual property is required. Watermark techniques effectively protect the intellectual property for multimedia data, and can prevent an unauthorized person from copying the multimedia data. In this paper, we propose a watermarking scheme to hide watermark information in low-frequency and high-frequency of wavelet transform. Experimental results show that the proposed watermark scheme is robust to several distortions including Gaussian noise and filtering, compression and contrast at different qualities.

원고지 상에 쓰여진 온라인 필기 제스쳐 인식기 구현

정우식,권영빈 중앙대학교 정보통신연구소 2000 정보통신연구소논문집 Vol.2 No.2

본 논문에서는 원고지 상에 작성된 문자들의 교정을 위한 제스쳐 인식 방법을 제안하고 있다. 원고지의 교정용으로 제시된 13개의 정의된 제스쳐를 중심으로 흘려 쓴 원고의 내용을 수정할 수 있도록 하였다. 이때, 인식을 위하여 제시된 프리미티브로는 직선, 곡선 및 원을 사용하였으며 이들은 벡터 세크먼트들의 조합에 의한 결합과정에 따라 한글 오토마타에 의해 정의되도록 하였다. 제시된 방법의 인식율은 40명의 다른 필기자가 작성한 520개의 샘플에 대하여 92%를 나타내어 실용화가 가능함을 보여주고 있다. In this paper, a method on handwriting gesture recognition for the oriental manuscript paper form is proposed. The pre-defined 13 different kinds of gestures are introduced on the boxed type manuscript paper on which the cursive handwrithing characters are already written. To detect the pre-defined gestures, primitives of line,curve, and circle are defined from the pre-calculated vector segments and its calculation using line merging process and automata. The recognition ratio of the proposed method is obtained at 92% among 520 samples with 40 different writers.

스트릿 댄스 시장의 과제와 개선 방안 연구 : 전문가 인터뷰를 중심으로

이우재, 나윤빈,문병순 한국실용무용학회 2024 한국실용무용학회지 Vol.2 No.1

본 연구는 최근 미디어 등을 통해 주목받고 있는 스트릿 댄스의 주요 과제를 파악하고 이에 대한 개선방안을 모색하였다. 문헌조사와 더불어 관련 종사자 겸 전문가 10명을 대상으로 FGI를 실시하였다. 연구 결과, 국내 스트릿 댄스 시장은 아직까지 제도적 미비함이 많은 것으로 나타났고, 이를 계약, 일자리, 법제도 측면으로 나누어 보았을 때, 일자리 정보 공유, 의무적인 표준계약서 사용,법적 갈등에 대한 지원 등의 개선방안이 필요한 것으로 나타났다. 아울러 향후 지속가능한 형태의 발전을 위한 방안으로는 스트릿댄스의 허브 역할을 할 공적 협회의 설립 및 운영이 필요하다. This study looked at street dance, which has recently become popular through the media. The method was to identify major problems in the market and find ways to improve them. A literature survey was conducted, and then focus group interviews were conducted with 10 related workers and experts. As a result of the study, the domestic street dance market still had many institutional insufficiencies. This was divided by type into contracts, jobs, and legal system aspects. Here, improvement measures such as sharing job information, andatory use of standard contracts, and support for legal conflicts were found to be necessary. In addition, for future mid- to long-term evelopment, it is necessary to establish and operate a public association that will serve as a hub for street dance.

Agrobacterium transformation 에 의해 Manganese SOD가 과발현된 transgenic tobacco의 개발에 대한 연구

徐廷彬,金榮照,李宇成 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

식물체는 냉해, 가뭄, air pollutants 등과 같은 다양한 외부 환경적인 스트레스에 노출되어짐으로써 매우 활동적인 oxygen radicals 생성을 유도한다. 이러한 활동적인 oxygen radicals 는 식물체 내의 수 많은 생리적 문제를 유발시킨다. 이러한 스트레스에 적응하고자 식물체 내에는 다양한 방어 기작이 있으며, 그 중 하나가 superoxide를 Hydrogen peroxide로 바꾸는 효소인 superoxide dismutase (SOD, EC 1.15.1.1)이다. 방어 기작에 있어서 SOD의 역할을 조사해 보고자, 본 실험에서는 담배의 엽록체에 완두의 manganese SOD를 과발현시킨 형질 전환 식물체를 개발하였다. Northern hybridization과 SOD activity gel staining을 해 본 결과, 이러한 형질 전환된 담배 엽록체 내에서 완두의 manganese SOD가 안정적으로 발현되고 있음을 확인할 수 있었다. Upon exposure of plant to diverse environmental stress such as chilling, drought, and air pollutants, the activated oxygen radicals are actively produced. These reactive oxygen species are associated with a number of physiological disorders in plant. One of the enzymes involved in the defense is superoxde dismutase (SOD, EC 1.15.1.1) which converts superoxide into hydrogen peroxide. To test the role of SOD in the defense system, We produce transgenic plants which are overexpressed Mn SOD of pea (Pisum sativum L.) in chloroplasts of tobacco (Nicotiana tabacum L. cv Xanthi). Using Northern hybridization and SOD activity gel staining, it was confirmed that these transgenic plants overexpressed the introduced gene.

미생물 막을 이용한 유동층 반응기에서의 생물학적 탈질화에 관한 연구

임교빈,김우식 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2

The effects of initial concentration, flow rate and recycle ratio were studied in a cylinderical reactor packed with activated carbon which was attached with biomass. The optimum conditions of Bacillus licheniformis were showed as pH was 7.0 and temperature was 30 degrees centigrade. In the case of initial concentration of 20mg ??-N/L, the removal efficiency was above 90% and it was from 63 to 80% for 80mg ??-N/L. According to the increase of initial concentration and flow rate, the removal efficiency was gradually decreased. For all of the initial concentrations and flow rates in the range of this experiment, the final concentration of Nitrate was decreased to the concentration of 1∼2mg ??-N/L when the recycle ratio is 4. As a rational basis of reactor design, mathematical model of biological denitrification in Fluidized Bed Biofilm Reactor was derived. ?? where a = ?? b = ??

에이즈 환자의 거대세포바이러스 감염증

김홍빈,박상원,김남중,최희정,신동현,오명돈,김우호,정흠,최강원 대한감염학회 1998 감염 Vol.30 No.4

배 경 : 거대세포바이러스 감염은 인간면역부전바이러스 (Human Immunodeficiency Virus, HIV) 감염자에서 발생하는 가장 중요한 기회감염증의 하나이다. 특히, 국내에서는 95%이상의 국민이 거대세포바이러스의 1차감염을 경험한 상태이므로 에이즈 환자에서 거대세포바이러스 질환의 빈도가 높을 것으로 예상된다. 대상 및 방법 : 1987년 10월부터 1996년 9월까지 서울대학교 병원에서 추적 관찰하였던 128명의 HIV 감염자를 대상으로 하였다. 이들 환자의 의무 기록에서 임상 자료를 얻었다. 거대세포바이러스 망막염은 안과 전문의의 임상적인 소견으로 진단하였으며, 위장관 등 망막이외 부위의 거대세포마이러스 질환은 조직학적으로 확인된 경우에 한하였다. 결 과 : 대상환자 128명의 추적관찰기간은 중앙값이 6(0∼59)개월 이었으며 7명 (5.4%)에서 거대세포바이러스 질환이 발생하였다. 거대세포바이러스 질환은 망막염이 6예, 식도염이 2예, 대장염이 1예, 폐렴 및 부신감염이 1예, 범발성 감염이 1예였다. 거대세포바이러스 질환의 발생빈도는 CD4+ 림프구 수가 적을수록 높았으며, CD4+ 수가 200/㎣미만인 환자 중 15% (6/33)에서 거대세포바이러스 질환이 확인되었다. 11예 중 9예를 ganciclovir로 치료하였으며 이중 7예에서 호전 또는 진행의 억제가 확인되었다. 추적관찰이 가능한 6예 중 3예 (50%)에서 재발하였다. 결 론 : 국내 에이즈 환자에서 거대세포바이러스 질환은 비교적 흔한 기회감염증이다. Background : Cytomegalovirus (CMV) infection is one of the important opportunistic infections in immunocompromised patients. In Korea, seroprevalence of IgG against CMV is over 95%. Therefore, CMV diseases are expected to be a prevalent opportunistic infection in AIDS patients. in Korea. Methods : We reviewed the medical records of 128 patients with HIV infection who visited the Seoul National University Hospital during the period from Nov. 1987 TO Sep. 1996. All the patients were examined by one ophthalmologist and the diagnosis of CMV retinitis were made by funduscopic findings. Other CMV diseases were diagnosed when histopathologic examinations showed the characteristic cytomegalic cells. Results : Median duratior, of follow-up was 8 months. Eleven CMV diseases were found in 7 patients (5.4%): 6 patients ahd retinitis, 2 esophagitis, 1 colitis, 1 pneumonitis, and one patient developed disseminated infection. Fifteen percent (6/33) of the patients whose CD4+ lymphocyte counts were less than 200/㎣ at baseline developed CMV diseases. Out of the 9 cases treated with ganciclovir, 7 improved or were stabilized. No patient received maintenance treatment and 3 had relapsed. Conclusion : CMV diseases are common opportunistic infections in AIDS patients in Korea.

Ampicillin투여에 의한 정상장내 대장균의 항균제 감수성 변동

이광호,장우현,이승훈,이정빈 대한화학요법학회 1983 대한화학요법학회지 Vol.1 No.2

The facts that bacterial isolates from residents of doctorless-rerote areas are usually sersitire t o coamon antimicrobial agents and that isolates from out-patients of Seoul Xational Gnirersity Hospital are more resistant t o many kinds of antiricrobial agexts, such as ampicillin. tetrzzycline, chlorazphenicol, .streptomycin, kanamycm, co-trimoxazole, etc. than the isolates froiz in-patients of the same hospital are, raise some intriguing questions about the dnri3g forces operating t o maintain the high incidence of mnltiple bacterial resistance in Korea. The w:des?read use .of .antimicrobd -agents is intimately related to the occurrence of bacteria! resistzzcc, for obT7ious reason. In tkese regards, easy accessibility t o zntimicrobial agents, t t a t is. tenderc? of Korean people to take antibiotics withogt medical Testriction, such a s doctor's Trescription, mizht be CCT-sidered tc be one of the most probable causes aggravating tlie situatica of antinicrobial resistance in Korez. On. the t2sis of such a prevaiIing circumstances in Korea, acthors wanted to el-alcate tlie undesiTsb!e side-effects of antibiotic administration on the flora cf hunan intestinsl E. c c l with 2 s?ecial respect to multiple resistance. AapicilIin x a s chosen and 4 times a day, each 1 g r , amounting t o 4 gm per da: wi-as ad inistrated orally to cormal healthy adults (2 males and 1 fen-ale) for 10 da5s. Fecd E. coli was isolated before and during ampicillin adninistraticn (da. G, 2,L, 6, S, and airez ax_picillin discontinuation (day J,6, IOth).Total 1,405 E. cclz strains TX ere subjectcc! crobial sensitivity testing(WE0-ICS) with ampicillin, mecillinarr, cefoFerzzone, k ct- anoxef, fosfomycin, tetracycline, chloramphehicol, strepton:-cin. ger.tzFicin, rifanFicir, T a!i- dixic acid. sulfamethcxazole, triaethoprim and co-trimoxazole (sulfamethoxazoie : trizethopirm =20 : I). E. coEz before ampicillin use, except a few isolates, was sensitivs t o most of the 6 1 - g ~tested. But the isolates at the time of ampic n use from the 2nd dar t o l@th day were. predominantly resistant not only to ampicillin, for obvious reason, But also, to tetracycline, chloramphenicol, streptomycin, sulfamethoxazole, trimethoprim, co-trimoxazole and more of less to mecillinam and cefoperazone, while they remained sensitive to gentamicin, rifampicin, nalidixic acid, lactamoxef and fosfomycin. Furthermore, the isolates after ampicillin discontinuation, as the sampling date kept going on became more and more sensitive to the drugs to which they had been resistant at the time of ampicillin administration. Taken these observations together, it might be cncluded that the major population of drugsensitive E. coli strains before ampicillin treatment becomes multiply resistant to commonly used drugs at the time of durg administration and then tends to be replaced by drugsensitive wild-type E.coli strains by the drug discontinuation. These data might explain the wide discrepancy in the incidence of drug-resistant E. coli between isolates from the residents of doctorless-remote areas and from the patients of large general hospitals and between isolated from out-patients and from in-patients of a general hospital, on the assumption that the use of antimicrobial agent itself constitutes the main driving force maintaining the favorable ecologic niche for the multiply drug-resistant bacterial strains in Korea.

슬관절부 골절에 대한 임상적 고찰

김기용,조우신,빈성일,백승일 울산대학교 의과대학 1992 울산의대학술지 Vol.1 No.1

The knee joint is the largest weight bearing joint. As the fractures of Knee joint in volve the articular surface and the surrounding soft tissues, permanent disabilities such as deformities, joint stiffness, instability and post-traumatic arthritis may ensue following treatment. Many authors have recommended various methods of treatment for these fractures. Recently, however, a trend toward internal fixation has become evident and good results have been reported by several authors. This study is to present 40 cases of knee joint fractures which were treated at Asan Medical Center from May 1989 to April 19992. The results were as follows ; 1. The causes of injury were traffic accident(60%), fall down(12.5%), slip down(12.5%) and sports injury(10%). 2. There were 23cases in 22 males and 17 females in series and average was 46.8 years ranging from 19 years to 82 years. 3. In femoral condylar fractures, the most frequent type was C2(8 cases ; 42.2%) and in tibial condylar fractures, B1(7 vases ; 35.5%) by the A.O. classification. 4. 7 Cases were treated by conservative method 32 cases by operative method and 1 cases by amputation. 5. Satisfactory results were obtained 73.3% in femoral condylar fractures and 88.2% in tibial condylar fractures by operative treatment. We concluded that satisfactory results were obtained from operative treatment with procedures of anatomical reduction, rigid fixation and early joint motion.

탈지대두박에서의 Isoflavone의 분리를 위한 흡착제의 조건

여경은,조성빈,김우정 한국산업식품공학회 2003 산업 식품공학 Vol.7 No.4

탈지대두박을 이용한 isoflavone의 분리 및 정제를 위한 최적 조건을 찾고자 absorption resin인 Amberlite XAD-1180를 사용하여 흡착제의 활성화용매의 농도, 흡착된 isoflavone의 용출용매의 농도, 용출용매의 양과 용출속도, 시료와 흡착제의 비율 그리고 수지에 미치는 pH와 ion의 영향을 조사하였다. 수지의 활성화와 용출에는 Amberlite XAD-1180의 경우 methanol 75%로 활성화시키기 ethanol 80%로 용출시키는 경우가 가장 높은 값을 보였으며, 이때 사용하는 absorption resin은 isoflavone 흡착을 위해 사용한 단백질제거 탈지대두박용액양의 약 0.5배로, ethatnol의 양은 단백질제거 탈지대두박용액 양의 4배를 사용하여 flow rate 12mL/min의 경우가 적절한 조건임이 밝혀져 흡착제 사용이 isoflavone 함량을 최고 2~3배까지 향상시키는 결과를 보였다. 이때 분리된 isoflavone의 순도는 최고 40%까지 얻을 수 있었다. pH와 ion의 영향에서는 pH는 5.0,NaCl은 0.25N 이하에서 isoflavone의 유출량이 높았다. Conditions for sorption and elution of isoflavone with using amberlite XAD-1180 were studied to separate Isoflavone from defatted soybean flour (DSF). Isoflavone analyzed were daidzin, genistin, glycitin, daidzein, genistein and glycitein by HPLC. The result showed that washing Amberlite XAD-1180 with 75% methanol and then elution of isoflavone with 80% ethanol resulted the highest amounts of isoflavone recovered from the absorption resin. The most proper eluent factor was 4(eluent/sample volume), the sample factor was about 2(the volum of sample/the weight of resin) ad flow rate 12 mL/min. The pH 5.0 and less than 0.25 N NaCl were found to be proper for seperation of isoflavone. The isoflavone contents after seperation with absorption resin were about 40% in dry weight basis.

Comparative study of fertilization rates of C57BL/6NKorl and C57BL/6N mice obtained from two other sources

Woo Bin Yun,Hye Ryeong Kim,Ji Eun Kim,Jun Young Choi,Mi Rim Lee,Jin Ju Park,Bo Ram Song,Young Suk Jung,Hyun Keun Song,Joon Young Cho,Kil Soo Kim,Dae Youn Hwang 한국실험동물학회 2017 Laboratory Animal Research Vol.33 No.2

C57BL/6N is the most widely used inbred mouse strain applied in a wide variety of research areas including cancer, cardiovascular biology, developmental biology, diabetes and obesity, genetics, immunology, neurobiology, and sensorineural research. To compare the fertilization rates of C57BL/6NKorl mice with two commercial C57BL/6N stocks, differences in reproductive organ structures, sperm and egg numbers, fertilization rates, and embryo development rates among C57BL/6NKorl (Korea FDA source), C57BL/6NA (USA source), and C57BL/6NB (Japan source) mice were determined. Among the stocks, no significant differences were detected in organ weight and histological structure of male and female reproductive organs, although body weight was higher in C57BL/6NKorl mice than that in the other groups. The concentration and morphology of sperm and eggs in C57BL/6NKorl mice were similar to those of C57BL/6NA and C57BL/6NB mice. Furthermore, the three stocks had similar in vitro fertilization and embryo development rates, although these rates tended to be higher in C57BL/6NB mice. Pup body weight was higher in C57BL/6NKorl and C57BL/6NB mice than that in C57BL/6NA mice. The results of the present study suggest that C57BL/6NKorl, C57BL/6NA, and C57BL/6NB mice obtained from three different sources have similar fertilization and embryo development rates, although there were slight differences in the magnitude of their responses rates.