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

석유사업법 개정내용

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

대학부설 평생교육원 콘텐츠를 활용한 가정 내 온라인 평생교육이 발달장애인의 조리직무기술 습득 및 일반화에 미치는 효과

김영준,권량희,Kim, Young-Jun,Kwon, Ryang-Hee 중소기업융합학회 2021 융합정보논문지 Vol.11 No.8

본 연구는 대학부설 평생교육원 콘텐츠를 활용한 가정 내 온라인 평생교육이 발달장애인들의 조리직무기술 습득 및 일반화에 미치는 효과를 알아보는 데에 목적을 두어 실시되었다. 연구 대상은 학교 졸업 후 미취업의 상태로 가정 내에서 부모와 함께 거주하는 발달장애인 세 명으로 구성되었으며, 연구 설계 및 방법은 단일대상연구 중 대상자간 중다 간헐 기초선 설계의 기법이 사용되었다. 연구 결과, 연구 대상으로 참여한 세 명의 발달장애인은 대학부설 평생교육원 콘텐츠를 활용한 가정 내 온라인 평생교육을 통하여 조리직무기술을 효과적으로 습득하였으며, 가정이 아닌 실제 식당환경에서 역시 조리직무기술의 수행을 일반화한 것으로 나타났다. This study The purpose of this study was to investigate the effects of online lifelong education in a home using contents of university-affiliated lifelong education center on the acquisition and generalization of cooking task skills for persons with developmental disabilities. The subjects of this study were three persons with developmental disabilities who lived with their parents in the home without employment after graduation from school. The research design and method used the technique of multiple probe design across subjects during the single subject research. As a result of the study, the three persons with developmental disabilities who participated in the study effectively acquired cooking task skills through online lifelong education in the home using contents of university-affiliated lifelong education center, and generalized the performance of cooking task skills in the actual restaurant environment, not at home.

음성 및 오디오 부호화기를 위한 저지연 윈도우 스위칭 modified discrete cosine transform

김영준,이인성,Kim, Young-Joon,Lee, In-Sung 한국음향학회 2018 韓國音響學會誌 Vol.37 No.2

본 논문에서는 음성/오디오 부호화기를 위한 저지연 윈도우 스위칭 MDCT(Modified Discrete Cosine Transform) 방법을 제안한다. 윈도우 스위칭 알고리즘을 사용하여 신호의 특성이 빨리 변하는 전이 구간에서 음질 저하를 개선하고, 저지연 TDAC(Time Domain Aliasing Cancellation)를 사용하여 알고리즘 지연을 1/2로 줄일 수 있는 MDCT 방법을 제안한다. 제안된 윈도우 스위칭 방법은 기존 윈도우 스위칭 알고리즘이 다른 길이의 중첩합(overlap-add)을 사용하는 것과 달리, 일정한 길이의 중첩합을 사용하여 알고리즘 지연을 1/2로 줄일 수 있었고, 신호의 특성에 따라 윈도우의 종류를 2개로 줄여 프레임 상태를 표현하는 정보 비트를 1 bit 감소시킬 수 있었다. 제안한 알고리즘을 MDCT 기반의 음성/오디오 부호화기인 ITU-T(International Telecommunication Union - Telecommunication) G.729.1 부호화기에 적용하여 성능을 확인하였으며, 알고리즘 지연을 절반으로 감소시키면서 동일한 음질을 유지할 수 있었다. In this paper, we propose a low delay window switching MDCT (Modified Discrete Cosine Transform) method for speech/audio coder. The window switching algorithm is used to reduce the degradation of sound quality in non-stationary trasient duration and to reduce the algorithm delay by using the low delay TDAC (Time Domain Aliasing Cancellation). While the conventional window switching algorithms uses overlap-add with different lengths, the proposed method uses the fixed overlap add length. It results the reduction of algorithm delay by half and 1 bit reduction in frame indication information by using 2 window types. We apply the proposed algorithm to G.729.1 based on MDCT in order to evaluate the performance. The propose method shows the reduction of algorithm delay by half while speech quality of the proposed method maintains same as the conventional method.

보수 이론을 이용한 32비트 파이프라인 캐리 선택 가산기

김영준,김이섭,Kim, Young-Joon,Kim, Lee-Sup 대한전자공학회 2002 電子工學會論文誌-SD (Semiconductor and devices) Vol.39 No.9

캐리 선택 가산기에 파이프라인을 적용하면 적은 수의 파이프라인 스테이지를 가지면서 많은 수의 파이프라인 스테이지를 갖는 가산기처럼 높은 주파수 상에서 구동한다. 이 논문에서는 캐리 선택 가산기 구조를 적용한 4 블록 5스테이지 파이프라인 32비트 가산기를 제안하였다. 이 제안된 가산기는 기존의 16스테이지 파이프라인 32비트 가산기와 같이 높은 주파수에서 동작한다. 그럼에도 불구하고 이 제안된 가산기는 기존 16 스테이지 파이프라인 가산기 보다 3배 적은 트랜지스터로 구현 가능하다. 이 가산기는 0.25um CMOS 공정으로 구현할 때 2.5V전압에서 1.67GHz으로 동작한다. Using the carry-select adder scheme, an adder with small number of stages can be operated as fast as an adder with large number of stages. In this paper, a 4-block 5-stage 32-bit pipelined carry-select adder is designed and implemented. The proposed adder operates as fast as a conventional 16-stage 32-bit pipelined adder while the number of registers required is nearly same as a conventional 4-stage pipelined adder. This adder is operated at 1.67GHz clock frequency in a standard 0.25um CMOS technology with 2.5 V supply voltage.

AI 방역기간 돌입 - 철새의 이동경로와 AI와의 관계

김영준,Kim, Yeong-Jun 대한양계협회 2018 월간 양계 Vol.50 No.10

대학 학과 간 장애인평생교육 융합전공 탐색 비교과프로그램이 지적 및 발달장애 고등학생의 식당취업기술에 미치는 효과

김영준,권량희,Kim, Young-Jun,Kwon, Ryang-Hee 중소기업융합학회 2021 융합정보논문지 Vol.11 No.7

본 연구는 대학의 학과 간 장애인평생교육 융합전공 탐색에 대한 비교과프로그램이 지적 및 발달장애 고등학생들의 식당취업기술 수행에 미치는 효과를 검증하는 데 목적을 두어 실시되었다. 연구 방법은 세 명의 지적 및 발달장애 고등학생을 대상으로 한 사례연구의 절차로 구성되었으며, 구체적으로 단일대상연구 기법을 사용하였다. 연구 결과, 연구 참여자인 지적 및 발달장애 고등학생들은 대학에서 사회복지학과 및 식품영양학과 재학생을 대상으로 실시된 장애인평생교육 융합전공 탐색 비교과프로그램을 통해 식당취업기술을 효과적으로 습득 및 유지한 것으로 나타났다. 결론적으로, 대학의 장애인평생교육 융합전공 탐색을 위한 비교과프로그램은 지적 및 발달장애학생들의 식당취업기술을 비롯한 성인생활적응에 효과적인 콘텐츠라는 측면이 분석되었다. This study was conducted to verify the effectiveness of the university's extracurricular program of convergence majors on lifelong education for the disabled on the performance of restaurant employment skills for high school students with intellectual and developmental disabilities. The research method consisted of a case study procedure for three intellectual and developmental disability high school students, specifically using a single subject research technique. The study found that high school students with intellectual and developmental disabilities effectively acquired and maintained restaurant employment skills through extracurricular program on convergence majors of lifelong education for the disabled. In conclusion, the university's extracurricular program on convergence major of lifelong education for the disabled was analyzed to be effective in adapting to adult life and self-reliance, including restaurant employment skills of students with intellectual and developmental disabilities.

연구발표논문초록 ( 촉매 ) : 팔라듐 담지촉매의 소결현상에 관한 연구

김영준,성벽파정 (정) ( Y . J . Kim,B . Sung ) 한국화학공학회 1985 춘계총회초록집 Vol.- No.-