항공기내 연료 및 오일온도 변화에 대한 수치해석적 연구

김영준,김창녕,김철인,Kim, Yeong-Jun,Kim, Chang-Nyeong,Kim, Cheol-In 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.8

A transient analysis on temperatures of fuel and oil in hydraulic and lubrication systems in an aircraft was studied using the finite difference method. Numerical calculation was performed by an explicit method with modified Dufort-Frankel scheme. Among various missions, air superiority mission was considered as a mission model with 20% hot day ambient condition in subsonic region. The ambience of the aircraft was assumed as turbulent flow. Convective heat transfer coefficient were used in calculating heat transfer between the aircraft surface and the ambience. For an aircraft on the ground, an empirical equation represented as a function of free-stream air velocity was used. And the heat transfer coefficient for flat plate turbulent flow suggested by Eckert was employed for in-flight phases. The governing equations used in this analysis are the mass and energy conservation equations on fuel and oils. Here, analysis of fuel and oil temperature in the engine was not carried out. As a result of this analysis, the ground operation phase has shown the highest temperature and the largest rate of temperature increase among overall mission phases. Also, it is shown that fuel flow rate through fuel/oil heat exchanger plays an important role in temperature change of fuel and oil. This analysis could be an important part of studies to ensure thermal stability of the aircraft and can be applicable to thermal design of the aircraft fuel system.

방사상각막신경염의 임상양상을 보인 세라티아 마르세센스 각막염 1예

김영준,김병선,유웅선,정인영,서성욱,유지명,김성재,Young Jun Kim,Byoung Seon Kim,Woong Sun Yoo,In Young Chung,Seong Wook Seo,Ji Myong Yoo,Seong Jae Kim 대한안과학회 2014 대한안과학회지 Vol.55 No.9

Purpose: To report a case of Serratia marcescens keratitis presenting as radial keratoneuritis. Case summary: A 15-year-old female who wore cosmetic and orthokeratology contact lenses but performed inadequate lens care visited our clinic with severe pain and visual disturbance in her left eye. On slit lamp examination, central corneal epithelial defect and stromal infiltration with radial keratoneuritis were observed. Based on clinical findings and past history, Acanthamoeba keratitis was highly suspected. The patient was treated with topical chlorhexidine 0.02% (Sigma-Aldrich Co., MO, USA) and moxifloxacin 0.5% (Vigamox<sup><font size=`2`>Ⓡ</font>, Alcon, TX, USA) per hour with 200 mg of oral itraconazol (Sporaone<sup><font size=`2`>Ⓡ</font>, LG, Seoul, Korea) once a day. Symptoms and corneal lesions did not improve after three days. After Serratia marsenscens was isolated from her contact lenses and solution, topical chlorhexidine 0.02% was discontinued, and intravenous ceftazidime (Tazime<sup><font size=`2`>Ⓡ</font>, Hanmi, Seoul, Korea) and fortified ceftazidime (50 mg/mL) eye drop was added. The corneal lesion dramatically improved, and after six months of follow-up, best-corrected visual acuity was 20/20 in the affected eye. Conclusions: Radial keratoneuritis can present not only in Acanthamoeba keratitis, but also in Serratia marsenscens keratitis. Confirmation of the isolated organism is useful when treating radial keratoneuritis. J Korean Ophthalmol Soc 2014;55(9):1380-1383

당뇨황반부종에서 안내 베바시주맙 치료 후 빛간섭단층촬영을 이용한 망막 혈관 직경의 변화

김영준,김형은,송원경,김성수,Young Jun Kim,MD,Hyoung Eun Kim,MD,Won Kyung Song,MD,Sung Soo Kim,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.2

Purpose: To investigate retinal vascular caliber changes with Spectral Domain OCT after intravitreal bevacizumab injection in diabetic macular edema patients Methods: Thirty-four eyes of 29 diabetic macular edema patients who were intravitreously injected with bevacizumab (1.25 g/0.05 ml) were studied. Twenty-four fellow eyes of 24 patients with bevacizumab injection were also recruited as a control group. We measured retinal vascular caliber a distance of 0.5-1 disc sizes from the disc margin with Spectral Domain OCT at baseline and 1-month and 3-month follow-up visits. Central macular thicknesses were also measured. Results: Over the 3 months of study, there was a significant reduction of arteriolar caliber compared to baseline (p = 0.024), There was significant reduction of venular caliber at 1 month (p = 0.001) and 3 months (p = 0.000) compared to baseline. Venular caliber reduction at the 3-month follow-up was significantly correlated with central macular thickness (R = 0.487, p = 0.003). Conclusions: Retinal venular caliber reduction was significant at 1- and 3-month follow-up, and arteriolar caliber reduction was significant at 3-month follow-up compared to baseline. After 3 months of treatment, venular caliber reduction was correlated with reduction of central macular thickness. J Korean Ophthalmol Soc 2012;53(2):262-267

The Studies on the Organization and Expression of tRNA Gene III. The Structure of the $tRNA^{Asp}$ of Aspergillus nidulans

김영준,이병재,강현삼,Kim, Young-Joon,Lee, Byeong-Jae,Kang, Hyen-Sam 생화학분자생물학회 1986 한국생화학회지 Vol.19 No.2

하등 진핵세포인 Aspergillus nidulans에서의 tRNA 유전자의 구성과 발현을 알아보기 위하여, 먼저 Aspergillus의 균사체로부터 hot phenol 방법을 수정하여 전체의 tRNA들을 추출하였으며, DEAE-cellulose column chromatography와 2차원 전개 polyacrylamide gel 전기영동을 하여 특정 tRNA를 분리시켰다. tRNA를 유출하여 $^{14}C$-aspartic acid와 charging test하여 $tRNA^{Asp}$를 고른후 [r-$^{32}P$] ATP를 사용하여 tRNA의 말단에 표지한 뒤 enzymatic partial digestion 방법에 의해 RNA의 염기순서를 결정하였다. 그 결과 anticodon은 GUC로 밝혀졌고 그 외의 tRNA의 독특한 구조와 invariable sequence들이 잘 일치하고 있는것을 보았다. Total tRNA of Aspergillus nidulans was obtained by the hot phenol extraction and DEAE-cellulose column chromatography. After separating the tRNA by two-dimensional polyacrylamide gel electrophoresis, a single tRNA was isolated and more purified. This tRNA was labeled with [r-$^{32}P$]ATP, then sequenced with base specific RNases. The RNA sequence revealed that the anticodon was GUc. This tRNA carries aspartic acid. This sequence was compared with those of the other $tRNA^{Asp}$ and some structural characteristics were found.

기술정보 전문 검색 인력 양성을 위한 교과 과정모델 개발

김영준,박용진,Kim, Young-Jun,Park, Yong-Jin 대한전자공학회 2000 電子工學會論文誌 IE (Industry electronics) Vol.37 No.4

산업사회에서 지식기반 사회로 전환됨에 따라 모든 산업체에서는 기술정보를 신속, 정확하게 수집, 분석하여 경영활동에 반영하기 위한 기술정보관리의 필요성이 크게 증가하고 있다. 특히 기술정보에 취약한 중소기업 연구소의 경우 개발된 기술이나 개발하려 하는 기술에 대한 기술정보 취득의 어려움으로 연구개발에 커다란 어려움을 겪고 있다. 이에 대한 요구사항은 중소기업연구소를 대상으로 인터뷰 및 설문지를 통한 분석을 통해 파악하였다. 이러한 중요성에 비해 국내에서는 기술정보를 효율적으로 다룰 수 있는 전문인력양성을 위한 교육과정이 미비한 실정이다. 이러한 실정을 감안하여 본 논문은 과학기술 및 관련 정보에 대한 검색 및 분석에 필요한 전문지식 및 기능을 갖춘 검색인력을 양성할 수 있는 교육과정모델을 제시 및 개발하였다. 본 논문에서 개발한 교육과정모델은 국내 기술정보검색인력양상에 기여 할 것으로 예상된다. Changing from the industrial society to the knowledge based society, all industrial companies have faced the need of technology information management which is a knowledge of searching, gathering and analyzing technology information promptly and correctly to apply to their activities. Especially the research institutions in medium and smaller sized enterprises need the technology information management deeply because they have difficulty to find what is done or what is being done in which is related with their working. In spite of the importance of technology information is widespread, there is no course of academic study in korea to bring up the specialist dealing with technology information effectively. As the answer in this situation this paper is going to present and develop course curriculum for technology information special search man-power ; a course of study to bring up search man-power who have expert knowledge. The model of Course Curriculum which is developed in this paper will serve to make the searching expert of technology information in korea.

URL 주요특징을 고려한 악성URL 머신러닝 탐지모델 개발

김영준,이재우,Kim, Youngjun,Lee, Jaewoo 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.12

Cyber-attacks such as smishing and hacking mail exploiting COVID-19, political and social issues, have recently been continuous. Machine learning and deep learning technology research are conducted to prevent any damage due to cyber-attacks inducing malicious links to breach personal data. It has been concluded as a lack of basis to judge the attacks to be malicious in previous studies since the features of data set were excessively simple. In this paper, nine main features of three types, "URL Days", "URL Word", and "URL Abnormal", were proposed in addition to lexical features of URL which have been reflected in previous research. F1-Score and accuracy index were measured through four different types of machine learning algorithms. An improvement of 0.9% in a result and the highest value, 98.5%, were examined in F1-Score and accuracy through comparatively analyzing an existing research. These outcomes proved the main features contribute to elevating the values in both accuracy and performance.

혈소판 농축혈장과 법랑기질 단백질이 성견 3급 이개부 병소의 재생에 미치는 영향

김영준,임성빈,정진형,홍기석,Kim, Young-Jun,Lim, Sung-Bin,Chung, Chin-Hyung,Hong, Ki-Seok 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.4

The purpose of this study was to study the histopathological correlation between the use of platelet-rich plasma and enamel matrix protein used in conjunction with xenograft. compared to a control group with regards to bone regeneration at the grade III furcation area in beagle dogs. Control group was treated with bovine derived bone $powder(Biocera^{(R)})$, and experimental I group was treated with bovine derived bone powder and Platelet-rich plasma and experimental II group was treated with bovine derived bone powder and Enamel matrix $protein(Emdogain^{(R)})$. The regeneration rate of bone formation was observed and compared histopathologically at 2. 4, and 8 weeks after surgery. The results were as follows: 1. In control group and both experimental groups. inflammatory cells were observed but, new bone formation wasn't. 2. In control group, new cementum on the notch was found in 4 weeks, less mature periodontal ligament when compared to that of experimental group was found and cementum formation was great but, regeneration couldn't be seen in 8 weeks. 3. Experimental I group. new bone formation in the area adjacent to alveolar bone and graft material surrounded by more dense connective tissue were found in 4 weeks. New bone formation up to crown portion was found and periodontal ligament was aligned functionally and cementum more mature. 4. Experimental II group, new bone formation was found under the defect area in 4 weeks and new bone formation around graft material in 8 weeks, too, and there were a number of fibroblasts, blood vessels, acellular cementum, which was less mature when compared to that of experimental I group, and dense collagen fiber like which normal periodontal ligament has in periodontal ligament of experimental II group in 8 weeks. 5. As a result of histologic finding, bone formation rate were 18.0${\pm}$7.87%(control group), 34. 05${pm}$7.25%(experimental I group), 19.33 ${pm}$5.15%(experimental II group) in 4 weeks and 21.89${pm}$1.58%(control group), 38.82${pm}$3.2(experimental I group), 37.65${pm}$9.22%(experimental II group) in 8 weeks. 6. Statistically significant ratio of bone formation was observed in experimental I group in 4 weeks and in experimental II group in 8 weeks. When experimental I group was compared to experimental II group, the ratio of bone formation in experimental I group was higher than that in experimental II group in 4 weeks(p<0.05). This results suggest that platelet-rich plasma showed more new bone formation than enamel matrix protein within 4 weeks. And use of enamel matrix protein in the treatment of periodontal bone defects starts to enhance regeneration after 8 weeks in beagle dogs.

해저터널 계획 시 위험요소 극복을 위한 고려사항 - 설계사례를 중심으로 -

김영준,박민수,임구,이재성,김주철,Kim, Yeong-Jun,Park, Min-Su,Im, Gu,Lee, Jae-Seong,Kim, Ju-Cheol 한국터널지하공간학회 2021 자연, 터널 그리고 지하공간 Vol.23 No.1

석유사업법 개정내용

김영준,Kim, Yeong-Jun 대한석유협회 1986 석유와 에너지 Vol.1986 No.10

덕성여자대학교 비교과교육과정 성과분석 고도화 근거기반 실제(evidence-based practices) 융합 쟁점

김영준,권량희,Kim, Young-Jun,Kwon, Ryang-Hee 국제문화기술진흥원 2021 The Journal of the Convergence on Culture Technolo Vol.7 No.3

본 연구는 덕성여자대학교 비교과교육과정의 성과분석 고도화를 위한 근거기반 실제를 융합적으로 탐색하는데 목적을 두어 실시되었다. 연구 방법은 교육학 분야에서 대학의 비교과교육과정에 대한 성과분석을 다룬 선행연구를 분석하는 절차와 함께 전문가 회의 절차로 구성되었다. 연구 내용은 덕성여자대학교에서 비교과통합관리센터 조직 신설 이후 비교과교육과정의 성과분석 고도화를 위하여 근거기반되어야 할 실제를 몇 가지로 제시하는 것으로 구성되었다. 그리고 그 실제로는 비교과 맞춤형 학습역량 진단 도구 개발 및 진단 분석, 데이터 기반의 다차원적 분석(IR 시스템), 비교과 인증을 통한 상시 모니터링 분석, 부수적 환류도구 기반 분석이 융합적 관점과 맥락에서 제시되었다. 연구 결과, 덕성여자대학교 비교과교육과정의 성과분석 고도화를 위한 근거기반 실제는 덕성여자대학교의 비교과교육과정 성과평가 및 환류 시스템의 타당성과 안정성을 담보해 주며, 타 대학의 비교과 교육 업무에 긴밀한 영향을 줄 수 있는 것으로 분석되었다. This study was conducted for the purpose of convergence exploration of evidence-based practices for the advancement of performance analysis of the extracurricular activities at Duksung Women's University. The research method consisted of an expert meeting procedure along with a procedure for analyzing previous studies dealing with the performance analysis of the university's extracurricular activities in the field of pedagogy. The contents of this study consisted of presenting some facts that should be based on evidence for the advancement of performance analysis of the extracurricular activities after the establishment of the center for extracurricular activities in Duksung Women's University. And in practices, the development and diagnostic analysis of tools for diagnosing extracurricular customized learning capabilities, data-based multidimensional analysis (IR system), continuous monitoring analysis through extracurricular certification, and analysis based on feedback tools were presented in a convergence perspective and context. As a result of the study, the evidence-based practices for the advancement of the performance analysis of the extracurricular activities at Duksung Women's University guarantees the validity and stability of the performance evaluation and feedback system of the extracurricular activities at Duksung Women's University, and has a close influence on the extracurricular education work of other universities analyzed as possible.