1-Hexene과 2-Hexene의 발화특성에 관한 연구

최재욱,목연수,김상렬 釜山工業大學校 1990 論文集 Vol.32 No.-

This study was performed by experiments with ASTM's apparatus for determination of autoignition temperature to obtain autoignition characteristics of 1-Hexene and 2-Hexene. As results, minimum autoignition temperatures(MAIT) of 1-Hexene and 2-Hexene were respectively 254℃ and 257℃, and dropping volume corresponding to these temperatures was 0.23ml. Instantaneous ignition temperatures by using this dropping volume were 400℃ for 1-Hexene and 427℃ for 2-Hexen. Relation between ignition delay and temperature agreed with Semenov's equation and apparent activation energy for 1-Hexene and 2-Hexene was the same value of 39 Kcal/mol. Hence it was found that differences in autoignition characteristics of these materials were not significant.

SWS400강의 수중용접특성

최기용,이상율 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-

The characteristics of underwater welding of SWS400 steel were investigated. The bead-on-plate type welding using ilmenite type electrode (E4301) was performed by varying welding currents and the sizes of electrodes used. The amounts of hydrogen absorbed by the weld metal were measured using JIS Z3113 specification and the results were interpreted in terms of the cold cracking behaviors of the welded steel. The microstructural changes as well as the microhardness distribution after underwater welding were also investigated using Vickers microhardness tester and scanning electron and optical microscopy. The results indicated that the cold cracking could be avoided by welding under low current with an electrode with a small diameter.

레거시 시스템의 재사용을 위한 재공학 사례 연구

최일우,노재우,류성열 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

The various software engineering techniques have been come out in order to cope with the software crisis since 1980's. The software Engineering has focused on the process of software component development. The process products a development guide for a quality and productive improvement of software. But, most of the methodologies assume that a new system will be constructed and reused in the future these do not actually support efficiently how we reuse legacy system's resources and construct a new system. In this paper, we present an efficient Reverse Engineering Technique & Reengineering Process for reusing legacy systems, We describe efficient Reverse Engineering Technique & Reengineering Process's workflows with their own detail steps and verify them practically through the case study. So, we provide efficient guidelines to the software Reverse & Reengineering process construction which reuses the resources of a legacy system.

추간공 경유 경막외 차단술 환자의 합병증에 대한 조사 연구

최선주,배성열,서성화,김상대,김세훈,박정율 대한척추신경외과학회 2004 Neurospine Vol.1 No.1

Objective: To study on the incidence of complications from C-arm guided lumbar transforarninal epidural injections in patients with radiculopathy caused by either lumbar spinal stenosis or herniated intervertebral disc. Materials & Methods: A total of 1200 patients with back/leg pain for more 3 months and received therapeutic injections in recent 1-year period was evaluated. All procedures were performed by one neurosurgeon with careful monitoring by nursing staffs during and after the procedures. Two party observers reviewed medical charts including immediate postprocedure complications using standardized questionnaire. Results: Average 1.9 injections per patient were done. Complications per injection seen included 12 transient headaches (0.9%), 5 increased back pain(0.4%), 4 increased leg pain(0.3%), 4 facial flushing(0.3%), 2 increased blood sugar in an insulin-dependent diabetic(0.2%), I vasovagal reaction(0.08%), and I hypertension(0.08%). All of these complications resolved within several hours to 2 weeks and there were no need for further specific management. There were no major or permanent complications. The incidence of minor complications was 2.3% per injection. All reactions resolved without morbidity. Conclusion: Although effectiveness varies with different pathologies, the C-arm guided lumbar transforaminal epidural injection seems to be a safe and effective procedure for these patients when carefully performed and closely observed with appropriate nursing care.

EJB기반의 컴포넌트 개발 프로세스에 관한 연구

최일우,신정은,류성열 崇實大學校 生産技術硏究所 2001 論文集 Vol.31 No.-

Software component is one of the key technologies, which has goals to improve the productivity and the quality of software development. Recently, many enterprises try to introduce component technologies for efficient management of legacy software, fixing systematic process of software development, and cost reduction. In this paper, we propose a component development process for the component software assembled with Enterprise Java Beans components and J2EE patterns. also our proposal includes datail activities and instruction for each phase.

금호강수계 수질과 하천유역의 토양 및 농작물의 중금속루 오염에 관한 연구(II)

金相烈,李萬正,趙康烈,崔閏壽,石敬順,禹美姬,李蘭姬 대구효성 가톨릭 대학교 1984 연구논문집 Vol.29 No.2

Soil are mostly sandy and it has a little clay below 10%. In the fine sand fraction, quartz, plagioclase and alkali-feldspar are dominant in almost all samples. Small amounts of altered-feldspar, muscovite, biotite, hornblende and plant opal are present in some samples. They are mainly derived from weathering prodructs df granite, granodiorite and arkose or is mixture. The clay minerals are mainly expanding or nonexpanding 14A˚minerals, illite and kaolin minerals. Nonexpanding 14A˚minerals seems to be dioctahedral vermicurite which sandwiches gibbsite or chlorite.

유한요소법에 의한 헬리컬기어의 맞물림 강도특성에 관한 연구

박성환,유용석,김병석,최명진,오택열 慶熙大學校 大學院 1993 高凰論集 Vol.12 No.-

In this study, the mesh stiffness characteristics of helical gears are evaluated by applying the finite element method. The bending and shear deflections on the contact line are obtained by the finite element method, and the contact deflections are obtained using the equation of Weber and Banaschek. Finally, using the influence method, contact ratio and load sharing ratio, the mesh stiffness characteristics of helical gears are evaluated. The results obtained could be summarized as follows: 1) By increasing the facewidth and helix angle of helical gears, a more constant mesh stiffness and transmission errors are obtained. 2) m_p+m_f〈2.0 The characteristics of this class helical gear pair are similar to that of spur gear. 3) m_p+ 1.0m_f≥2.0 This class helical gear pair gives a good performance as expected from helical gears.

NaCl-KCl 혼합 수용액에서의 기체체류량과 물질전달계수에 관한 연구

金相烈,朴東源,崔載旭,韓相玉 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2

Gas Holdup and mass transfer coefficient were measured and the effect of activity coefficeent and gas velocity on them was studied. Gas holdup increased as the gas velocity increased, and decreased as the concentration of aqueous solutions of NaCl-KCl increased Mass transfer coefficient increased as the gas velocity increased, and decreased as the concentration of aqueous solutions if NaCl-KCl increased. Correlation equation between the gas holdup and mass transfer coefficient, and the various factors is shows a good agreement with experimental values.

'1998 한국인 우울증 선별의 날' 참가자들의 사회인구통계학적 특성과 우울증 선별검사 결과

한상익,이성필,고효진,박원명,장계호,유태열,전태연,채정호,방승규,김광수,최보문,이정태,백인호 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 1998년 정신건강의 날 기념 한국인 우울증 선별의 날 행사에 자발적으로 참여한 참가자들의 사회인구 통계학적 특성을 분석하고 우울증 선별검사 결과를 평가하기 위하여 본 연구를 시행하였다. 방 법 : 8개 병원에서 얻어진 619명의 자료를 사용하여 선별검사로 밝혀진 우울증의 유병율과 사회인구통계학적 특성 및 응답자의 정신과적 치료를 포함한 과거력 등을 조사하였다. 결 과 : 우울증 척도 점수는 응답자 전체 평균 57.5±13.8로 경도의 우울 증상이 있는 것에 해당되었다. 전체 응답자의 69.5%(430명)가 최소한 경도 이상의 우울 증상을, 43.1%(267명)가 중등도 이상의 우울 증상을, 18.4%(114명)가 고도의 우울 증상을 보였다. 고도의 우울 증상이 있는 응답자의 56.8%와 중등도의 우울 증상이 있는 응답자의 63.9%가 정신과 치료를 받은 적이 전혀 없었다. 나이가 29세 이하인 것과 전임근무 중인 직업상태는 각각 나이가 60세 이상인 것과 직업이 없는 것에 비교하여 우울증으로부터 보호하는 인자임을 시사하였다. 결 론 : '1998 한국인 우울증 선별의 날' 행사를 통하여 많은 우울증 환자들을 선별해낼 수 있었고, 이들의 우울 증상은 몇몇 사회인구통계학적 특성과 유의한 관계가 있음을 확인하였다. 우울증 선별의 날 행사를 통한 우울증에 대한 교육과 우울증 선별검사는 치료받지 못하고 있는 우울증 환자 및 기존의 치료 중인 환자 모두에게 유용한 프로그램임을 알 수 있었다. Objectives : This study was performed to analyze the sociodemographic characteristics of participants in '1998 Korean Depression Screening Day' and to evaluate the results of the screening test. Methods : By using the survey results of 619 volunteers from 8 hospitals, the authors examined the prevalence of depression detected at the screening test and sociodemographic characteristics and the psychiatric treatment history of respondents. The assessment measure was the Zung Self-Rating Depression Scale. Results : The mean depression score of all participants was 57.5±13.8 and it came under mild depression. Of all participants, 69.5%(N=430) had at least mild depressive symptoms, 43.1%(N=267) had at least moderate symptoms, and 18.4%(N=114) had severe symptoms. Never have 56.8% of respondents in the severely depressed range and 63.9% of those in the moderately depressed range had psychiatric treatment. The results suggest that the age group of 29-year-old or younger(relative to 60-year-old or older group) and full-time employment status(relative to unemployment) are protective factors of depression. Conclusions : By '1998 Korean Depression Screening Day', many depressed patients were detected and their depressive symptoms had statistically significant relationships with some sociodemographic characteristics. The results suggest that the education and screening test programs for depressive illness facilitated by Depression Screening Day are useful to the patients regardless of being under current treatment or not.

성인에서 발생한 설사 동반성 용혈성 요독 증후군 3례

김진호,장광열,김구,배성진,김성은,김기현,최필선 동아대학교의과대학 1997 동아의대학술지 Vol.9 No.2