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김영준,Kim, Yeong-Jun 대한타이어공업협회 1973 타이어 고무 Vol.47 No.-
김영준사장은 작년 6월 동신화학 사장으로 취임한 직후부터 최근까지 6차례에 걸쳐 미국시장을 찾아 한국「타이어」수출을 위한 획기적인 성과를 안고 돌아왔다. 농림부장관을 퇴임한 후 부실기업인 흥한화섬을 맡아 일약 성장기업으로 키워놓고 다시 부실화된 동신화학을 재건중에 있는 그는 취임 11개월만인 지난 5월부터는 흑자기업으로 일으켜 세웠다. 해외시장 개척부진과 출혈수출로 작년도 「타이어」업계의 수출은 5백만달러선에 머무르고 있는데 김사장은 연 2천만달러의 장기계약을 미국의 「시어스ㆍ로박」과 체결함으로써 「타이어」대미수출의 전기를 마련하고 귀국 했다.<편집자주>
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하악전돌증환자에서 하악지시상분할골절단술 후 전산화단층촬영을 이용한 근심골편의 횡적인 변화에 관한 연구
김영준,국민석,박홍주,오희균,Kim, Young-Joon,Kook, Min-Suk,Park, Hong-Ju,Shet, Uttom Kumar,Oh, Hee-Kyun 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
Purpose: This study was performed to evaluate transverse changes of proximal segment after bilateral sagittal split ramus osteotomy (BSSRO) using 3-D CT in mandibular prognathism. Patients and methods: Twenty-two patients who underwent BSSRO for mandibular set-back in class III malocclusion without facial asymmetry were examined. Miniplates were used for the fixation after BSSRO. Facial CT was taken before and after BSSRO within 3 months. Frontal-ramal inclination (FRI), inter-gonial width (IGW) and intercondylar width (ICW) were measured in 3-D CT images using V-works $4.0^{TM}$ program. Student t-test was used to compare the changes between pre- and post-operative measurements using SPSS 10.0 program. Results: 1. Mean peroperative FRI value ($12.87{\pm}3.43^{\circ}$) was slightly increased to postoperative value ($14.13{\pm}3.72^{\circ}$) (p < 0.05). The average FRI increased 10.42% and the range was from $-2.46^{\circ}$ to $3.34^{\circ}$. 2. Mean peroperative IGW ($99.01{\pm}5.36$) was slightly decreased to postoperative IGW ($96.51{\pm}5.88mm$) (p < 0.05). The average IGW decreased 2.52 % and the range was from $-6.61^{\circ}$ to 0.91 mm. 3. Mean preoperative ICW ($125.01{\pm}5.30mm$) was slightly decreased to postoperative ICW ($125.40{\pm}5.45mm$) (p < 0.05). There is no significant difference between pre- and post-operative ICW. 4. There was significant correlationship between FRI difference and IGW difference (p < 0.05). Conclusions: These results indicate that the lower ramus of the proximal segment is moved inward after BSSRO procedure for mandibular set-back.
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직접중합법에 의한 방향족 폴리아미드알킬에스테르의 제조 및 열적 이미드화 속도론에 관한 연구
김영준,손상현 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.11
Poly(amirs dialkyl ester) precursors of high performance polyimides were synthesized by employing the direct polymerization method using phenylphosphonic dichloride as an activating agent and pyridine as a Lewis base. Their thermal imidization behavior was investigated by performing both isothermal and nonisothermal TGA(thermogravimetric analysis) experiments. The precursor polymers showed a two-stage imidization behavior, i.e., fast imidization at the early stage and slow imidization at the later stage. In our studies, the kinetic data obtained at the early stage were chosen to determine the rate constants. Kinetic data were interpreted using the first order kinetic plot of the logarithmic wt % loss versus time. The observed imidization behavior was interpreted in view of the length of alkyl leaving group, chemical reactivity and the mobilitl of polymer backbones.
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브롬 및 인을 포함하는 단량체를 이용한 방염성 폴리에스테르 섬유신소재 개발에 관한 연구
김영준,이창익,박연흠 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.5
Two different types of phosphorus and bromine containing diester monomers, one containing a oxygen-phosphorus-oxygen bond and the other containing a carbon-phosphorus-carbon bond, were synthesized and their chemical structures were characterized by $^1H-NMR$ spectroscopy. Thus, bis(2,6-dibromo-4-methoxycarbonylphenoxy)phenylphosphine oxide(III) was synthesized by bromination of methyl-4-hydroxybenzoate followed by the reaction with phenylphosphonic dichloride. Bis(4-methoxycarbonylphenyl)bromophenyl phosphine oxide(VII) was synthesized by Grignard reaction of 4-bromotoluene with phenylphosphonic dichloride followed by oxidation, esterification, and bromination. Monomer III did not give a high molecular weight polyester when polymerized with ethylene glycol due to decomposition to starting materials via transesterification which was confirmed by thin layer chromatography. The conventional two step melt polymerization of the monomer VII and dimethylterephthalate with ethylene glycol, however, produced high molecular weight copolyesters. Transition behavior of copolyesters was investigated by differential scanning calorimetry and their flame resistance was estimated from % char residue obtained from thermogravimetric analyzer. Copolyesters derived from monomer VII exhibited high % char yield, which is strong evidence of improved flame retardancy.
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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.
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김영준,Kim, Young-Jun The Korean Fiber Society 1996 한국섬유공학회지 Vol.33 No.5
Miscibility of polymer blends prepared from poly(2,2(m-phenylene)-5,5'-ben-zimidazole), PBI, and aromatic polyimides(Pls) were investigated as a function of structural variations of polyimide component utilizing DSC and FTIR spectroscopy. Film and powder blend samples were prepared from the solution of PBI and PIs in N,N-dimethylacetamide(DMAc) and/or 1-methyl-2-pyrrolidinone(NMP). The miscibility of the PBI/PI blends was found to improve with increasing polarity of the polyimide component. For example, 3,3'-diaminodiphenyl sulfone(3,3'-DDS)/3,3',4,4'-benzophenone tetracarboxylic dianhydride(BTDA), 3,3'-DDS/4,4'-ox-ydiphthalic anhydride(ODPA) and 4,4'-isopropy lidene dianiline(BIS-A)/ODPA polyimide systems were miscible with PBI. However, when the polar polyimide components(C=O, O and SO ) were replaced by non-polar components such as hexafluoropropylidene group((CF ) C) miscibility was significantly reduced. Thus, immiscibility was obtained for polyimides based upon 5,5'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene] his-1,3-isobenzofuranedione (6FDA) such as 4,4'-di-aminodiphenyl sulfone(4,4'-DDS)/6FDA,4,4'-oxydianiline(4,4'-ODA)/6FDA and BIS-A/6FDA polyimide systems. Non-hydrogen bonded solubility parameters for the PBI and Pls were estimated using group molar attraction constants(F) and group molar volume(V). The observed miscibility behavior was in good accord with the prediction of miscibility by the non-hydrogen bonded solubility parameter approach.
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