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알루미늄 합금과 고장력 강판 접합을 위한 헬리컬 SPR의 단조공정 설계
김원영, 김동범, 김기호, 김도훈, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
A self-piercing rivet(SPR) is a mechanical component for joining dissimilar materials. It is used for joining dissimilar material sheets such as aluminum alloy and steel. The self-piercing rivet directly pierces into sheets without drilling sheets beforehand unlike conventional rivets. However, the self-piercing rivet occurs buckling when piercing high strength steel. Therefore, a helical SPR which can pierce high strength steel sheet was designed. In this study, forging process was designed for manufacturing the helical SPR and simulated by using commercial FEM code DEFORM-3D. In the simulation of forging process for manufacturing rivet, process sequence, formability, forging load were investigated. The suitable forging process could be designed by comparisons of simulated results. Experimental trials have been carried out for same conditions as simulated ones. The simulated results agreed with the experimental ones. So, the analytic approach in this thesis is useful to save cost and time in the forging industry
요오드이동중합에 의한 Telechelic Diiodo-poly(VDF-co-HFP)의 합성연구
원종웅,이범재 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2
The structure-controlled α,ω-diiodo-poly(vinyliene fluoride-co-hexafluoropropylene) was polymerized by Iodine Transfer Polymerization(ITP), which in one of the controlled telomerization methods. The molecular weight of the polymer increased linearly with polymerization time and [monomer]/[iodide] ratio and the polymer showed a narrow molecular weight distribution (PDI<1.3). The chain-end structure of α,ω-diiodo-poly(vinyliene fluoride-co-hexafluoropropylene) was consisted of both -CH_2CF_2-I and -CF_2CH_2-I. This difunctional ITP of VDF/HFP was found to show the pseudo-living characteristics, in which molecular weight could be controlled and the functionality was close to 2. This telechelic copolymer with Mn<10,000g/mol can be used as telechelic fluorinated prepolymer after transformation of the chain-end iodo group.
한국판 해밀턴 우울증평가척도(K-HDRS)의 확인적 요인 분석
박혜원,이은호,김도관,유범희,이동수,김지혜 大韓神經精神醫學會 2009 신경정신의학 Vol.48 No.1
Objectives The present study was conducted to examine the factor structure of a Korean version of the Hamilton Depression Rating Scale (K-HDRS), and we did so by performing a confirmatory factor analysis (CFA). Methods The data from the 17-item K-HDRS data was obtained from 319 South Koreans who met the DSM-IV Criteria of Major Depressive Disorder. We examined the fit of ten competing models. The CFAs were evaluated in their original first-order structures and in their hierarchically related counterparts. Results The alternative models obtained unsatisfactory fit indices, although the five-factor inter-correlated model (model 5a) demonstrated a relatively good fit to the data. The model 5a also performed better than its hierarchically related counterpart (model 5b). The Modification Indices (MIs) were used to provide a more satisfactory account of the data. The Mls suggested correlations between the unique variances of items (item 1 & 3, item 10 & 15), and these parameters were added to the model 5a. After introducing minor modifications, the 'final' model (5m) yielded an improved model fit. Conclusion This study suggests that the symptoms of depression, as assessed by the K-HDRS, cluster into five factors : anhedonia/retardation, guilt/agitation, bodily symptoms, insomnia and appetite. This study provides evidence for the cross-cultural generalizability of the HDRS, although some refinement of the scale is still required.
요추간판탈출증에서 현미경 수술과 경피적 자동수핵제거술에 대한 비교연구
신원한,장재칠,주교성,김범태,최순관,변박장 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.1
A retrospective study of operative results were carried out in a series of 164 patients who were performed microdiscectomy and 57 patients performed automated percutaneous lumbar discectomy (APLD) for herniated lumbar discs between January 1, 1990 and June 30, 1996 at the Department of Neurosurgery, Soonchunhyang University Hospital. The operative results were analysed, and the correlation between preoperative clinicoradiological factors and postoperative clinical results were statistically assessed. The major results were as follows : 1. Of 164 microdiscectomy cases, 102 were males and 62 were females, mean age was 42.4 years and incidence was the highest in the 5th decade, and of 57 APLD cases, 43 were male and 14 female, mean age was 32.2 years and incidence was the highest in the 3rd decade. 2. The preoperative symptoms and signs were lumbago(98.2%), radiating pain(96.3%), positive straight leg raising test(77.4%), motor weakness(27.4%), claudication(13.4%) & voiding difficulty(2.4%) in microdiscectomy cases, and lumbago(98.2%), radiating pain(98.2%), positive straight leg raising test(70.2%) & motor weakness(17.5%) in APLD cases. 3. Number of operated levels were performed 226 in microdiscectomy and 74 in APLD. The most commonly operated levels of two groups were L4-5 level. 4. Operative results 1) The overall success rates by Prolo's scale were 87.1% in microdiscectomy and 80.7% in APLD, respectively. 2) In younger age group (below 30 years) and in non-compensatory group, success rates were significantly higher in microdiscectomy. 3) As to protrusion and degeneration on MRI, clinical results of moderate protrusion and degeneration of discs in microdiscectomy were statistically significant, and those of mild protrusion and degeneration of discs in APLD were also statistically significant. 4) The most common cause of failure was inappropriate removal of disc material in microdiscectomy and sequestered discs in APLD. According to the above results, there were no differance in overall success rates between microdiscectomy and APLD. But clinical results seem to be influenced by the age, existence of compensation, and by the degree of protrusion and degeneration of discs as prognostic factors. If the selection of operative procedure between microdiscectomy and APLD for herniated lumbar disc is carefully done with clinical and radiologic findings of patients, good outcome might be achieved.
한국전래동요의 수사 연구 : 주술동요·예언동요를 중심으로
전원범 한국초등국어교육학회 2005 한국초등국어교육 Vol.29 No.-
주술동요는 초자연적(超自然的) 힘에 의해 자신의 요구대로 변화될 것을 믿고 노래 부르는 일종의 종교적 기능의 노래이다. 또 예언동요는 참적(讖的)성격을 지닌 노래로 어떤 사건이나 일을 미리서 암시했기 때문에 정치현실에 대한 예언기능이 강한 노래이다. 본 연구에서는 우선 기능적 성격이 두드러진 주술동요(呪術童謠)와 예언동요(豫言童謠)를 중심으로 수사적(修辭的) 특징을 분석해 보았다. 그 결과 189편의 주술동요에서는 명령법 111편, 반복법 106편, 돈호법 77편, 위협적 언어 사용 43편, 반어법 41편, 압운식 27편, 나열법 16편 등이 각각 보이고 있다. 또 예언동요는 72편을 분석한 결과 풍유법 72편, 반복법 21편, 중의법 12편, 대조법 12편, 나열법 10편 등의 순이었다. 주술동요가 동물 특히 곤충을 대상으로 하여 극단적 표현으로 원시적 욕망을 나타내는 노래였기 때문에 수사상의 특징으로도 자연히 명령법, 반복법, 돈호법이 주로 쓰이고 있음을 볼 수 있다. 예언동요도 시대적 사건에 대한 예언적 기능을 가진 노래였기 때문에 자연히 전편에 풍유법이 쓰였고 반복법, 중의법이 많이 쓰였음을 볼 수 있다. 본 연구가 한국전래동요 표현수사의 한 부분적 연구로서, 일련의 해명작업에 기초가 되기를 바라며, 또한 한국전래동요의 전반적 연구에 도움이 되기를 바란다. Magic song is a kind of religious function which is sung with the belief in change by supernatural force. Prophecy song has a strong prophecy function of political reality since it predicted an accident or a matter. This study analyzes rhetorical characteristics centering around prophecy songs and magic songs having a remarkable magic functions. Consequently, 189 magic songs show imperative mood of 111 times, repetition use of 106 times, apostrophe use of 77 times, threatening language use of 43 times, irony use of 41 times, rhyme use of 27 times and recitation use of 10 times. Since magic songs express primitive desire through animals and especially particular insects with extreme forms of expression, frequent uses of imperative mood, repetition and apostrophe as rhetorical features have been found. Since prophecy songs have prophetic functions of historical accidents, it was found that allegory, repetition and ambiguity were frequently used. It is hoped that this study will be available in researching Korean traditional songs for children.
양원호,이동원,김홍석,박윤범,현명택 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2
Emulsified fuel (mixed fuels with a small quantity of water) is suggested as a way of simultaneously diminishing NO_(x) and particulate matter. It is, therefore, an eco-friendly fuel and economical energy source. In this research, a comparative analysis between diesel fuel and emulsified fuel on their characteristics and the performance was done.