수분에 불안정한 2-(Trimethylsilyloxy)furan의 수용체에서의 카르보닐 부가반응 연구

柳燦模,李宗昊,李晟洙,尹淑卿 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

The irreversible addition of 2-(trimethylsilyloxy)furan to various aldehydes in the presence of catalytic amount of alkali metal carbonate in aqueous media is described. Even though alkli metal enolates have many synthetic advantages of applicability and high selections of (E)- and (Z)- enolate geometry, their application to carbonyl addition have been utilized in limited purpose mainly due to the low stereoselectivity resulted from the equilibrium between retroaldol and realdol. The addition of 2-(trimethylsilyloxy)furan to the aldehyde in the presence of K_2CO_3 in aqueous media(THF : H_2O = 9 : 1) at -20℃ resulted in the formation of addition product in high yield and moderate good stereo selection (3-15:1).

TEMPOL(??)에 대한 전자 스핀 공명 연구

유홍용,한찬수 순천향대학교 기초과학연구소 1999 순천향자연과학연구 논문집 Vol.5 No.1

Electron spin resonance studies of the free radical TEMPOL have been carried out at room temperature. The ESR spectra have 3 hyperfine lines due to interactions with the nuclei of nitrogen of the radical. As results of our analysis, the ESR parameters have been found that ??, ??. From the hyperfine interaction with a nucleus of nitrogen, it is suggested that the magnetic electron in the radical is localized around the nucleus.

부분입체선택적 Zwitterionic Claisen 전위반응

柳燦模,崔夏洵,李宗昊,鄭元爀 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

Aza-Claisen rearrangement through the zwitterionic intermediate is described. This reaction was able to carry out at low temperature(-78∼0℃) and also exhibited high diastereoselectivities. The formation of zwitterionic intermediate was realized by addition of t-crotylamine to the ketene formed from deprotonation of corresponding acyl halide. The electronically neutral product was achieved through the [3,3]-sigmatropic rearrangement of self-promoted zwitterionic intermediate in high diastereoselectivity due to lower reaction temperature. Treatment of N-crotylpiperidine with propionyl chloride in the presence of K_2CO_3 at 0℃ for 1 h gave threo selective(97 : 3) amide in 41% isolated yield.

새로운 [3,3]-Sigmatropic Rearrangement를 이용한 입체선택적 아미드의 합성

柳燦模 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.2

새로운 [3, 3]-sigmatropic rearrangement를 통한 효율적인 입체선택적 amide 합성경로를 개발하였다. 키틴과 3차알릴아민의 부가물의 전위로 97:3의 입체선택적으로 amide가 생성되었다. 이 방법론은 비고리화합물의 입체선택적 합성에 넓은 응용성과 효율성을 나타내었다. A diastereoselective synthetic route to amide through novel [3, 3]-sigmatropic rearrangement has been developed. Rearrangement of adduct between ketene and t-allyamine afforded amide with 97:3 diastereoselection. The method exibited wide applicablity and efficacy for the stereoselective synthesis of acyclic system.

女子中ㆍ高等學生의 服飾行動과 服裝規範에 대한 硏究 : 學校에서의 服裝規定을 中心으로 Focusing on Clothing Regulations in the School

유덕화,박찬부 한국 가정과 교육 학회 1991 한국가정과교육학회지 Vol.3 No.-

The purpose of this study was to investigate the following contents ; 1. Relationship between clothing behavior (modesty, conformity, importance) and clothing regulations of school girls. 2. The differences between middle school girls and high school girls in clothing behavior and in attitude toward clothing regulations. 3. The differences between stuendts gerself norms and subjective norms (the students thoughts which would be parents opinions and teachers opinins) in attitude toward clothing regulations. Questionnaires were designed and administered to 300 middle school girls and 302 high school girls in Inchon. The obtained data were statistically analyzed by Pearson's correlation coefficients, t-test, F-test, and Duncan test. The results of the study were summarized as follows; 1. As tho the differences in responses between school levels, the high school girls showed higher interest in conformity. But there is on differances in Modesty and Importance by school levels. 2. As tho the differences in responses between school levels, there were on differences in attitued toward clothing regulations. But according by types of clothing regulations, high school girls showed higher desired in shoes and sack. 3. In correlation coefficients between the variables on clothing behaviors and the attitudes toward clothing regulations of school girls, modesty is the most related toward clothing reguations of school girls and conformaity, importance the next. The higher the school girls are in modesty, the more follow the clothing reguations. And the higer the school girls are in conformity and importance, the lower follow the clothing reguations. 4. The differences between students herself norms and subjective norms (the studenst thoughts which would be parents opinions and teachers opinions), students and parents showed lower scores than teachers. That is tho say, theachers put more restrictions on students clothing than parents do.

An MO Studies on Reaction Mechanism and Reactivity of β-Chloro Difluoro Ethyl Methyl Sulfides, Sulfoxides and Sulfones

崔燦有,金宜洛,白禹鉉 東國大學校 1976 論文集 Vol.15 No.-

반경험적 분자궤도 함수론인 확장 HU¨ckl 법을 β-Chloro difluoro ethyl methyl sulfides, sulfoxides, sulfones에 적용하여 반응기구와 상대적인 반응속도를 설명하고 n-propyl chloride와 비교 하였다. 계산결과는 실험값과 반응성지수가 잘 일치함을 보였다. A semiempirical molecular orbital theory which is known as extended Hu¨ckel theory is applied to explain the relative reactivity and the reaction mechanism of β-Chloro difluoro ethyl methyl sulfides, sulfoxides, sufones and compared with n-propyl chloride. It has been shown that the calculated MO theoretical reactivity indices are consistent with the experimental order of the reactivity and reaction mechanism.

마찰력과 열처리에 따른 아크용사 및 아크용접된 Fe-Cr-B 합금 피복층의 변화

이찬규,유인석,김강형,구본흔,박맹로 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-

Variations of arc thermal sprayed and arc welded Fe-Cr-B alloy coating with frictional loading and heat treatment were investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy, electron probe microanalysis and hardness test. The as-coated layers were shown to be crystalline state but peaks with the frictional loading largely disappeared in X-ray diffraction profiles. The splat is relatively wavy with the boundary in arc thermal spray coating. After heat treatment, the amount of porosity was found to be decreased and the intersplat distance was increased. As annealing temperature increased, interface layer for arc welding coating increased by the diffusion of Cr atoms. The wear type observed in arc thermal spray coatings is splat delamination. The hardness of the arc thermal spray coation layer was superior to that of the arc welding layer. Hardness of coated layer is reduced and microstructures become to be uniformed by the heat treatment.

기도이물에 관한 임상적 고찰

한찬수,김태정,김일호,김유재,김천숙,안기량 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

Aspiration of a foreign body in the airway is common cause of sudden obstructive breathing, crouping cough, hoarseness, and wheezing. Especially that caused serious problem in case of the young children. A past history of foreign body aspiration is itself an indication for bronchoscopic examination of the airway, because some children with aspirated foreign bodies are without symptoms and chest X-ray films may not show abnormalities. So the anesthesiologist should take a notice of removing foreign body in the anesthetic procedure. The author have experienced 36 cases removal of foreign bodies in the airway under general anesthesia from July, 1982 to January, 1996 in Chunan Hospital, College of Medicine, Soonchunhyang University. The results were as follows 1) Among the 36 cases, 25 cases(69.7%) were under the age of 5. The ratio of male and female was 1.8 : 1. 2) In duration of lodgement, there was most frequent within one day in 15 cases(41.7%) and the longest duration was 20 days. 3) The most common symptom, sign and auscultation finding were cough 19 cases(52.8%). chest retractions 7 cases(19.4%) and decreased breathing sound 20 cases(55.6%) 4) Abnormalities in the chest X-ray were found in 15 cases(41.7%) among 36 cases. 5) Vegetable foreign bodies, expecially peanut were the most common airway foreign body(28.7%), followed by plastic foreign body(14.4%) and mucous plug(11.3%). 6) The foreign body involved the right bronchus 16 cases(45.7), left bronchus 10 cases(28.6%), trachea 5 cases(14.3%), and larynx 4 cases(11.4%). 7) Foreign body induced complications occurred in 9 cases(25.0%); pneumonia 8 cases and pneumomediastinum 1 case, and all of postoperative complication was pneumonia(25.0%). 8) 34 foreign objects(94.4%) were removed by endoscopy but tracheostomy was required in two patients.

광주전남지역 정상 신생아의 코의 형태와 계측치에 대한 연구

이유진,양정열,이승찬,천지선,박상기 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

Background and Objectives: Cleft lip and palate are common defects in congenital deformity. They are the most frequent deformity in the face. Nose deformity is most common among various facial deformity at the center of face. So we must operate to correct the deformity at the earliest stage to give a patient and parent spiritual relief from anxiety, and it is the trend of the treatment recently. We must know the facial anthropometry in newborn to try at the early stage, but there is a lack of literature and research on newborns. So we carried out this research to form base data for operations. Materials and Methods : The noses of 90 newborns in Gwangju-Cheonnam area were analyzed quantitatively, based on 10 nasal measuring points and 13 anthropometric values taken directly from the face of newborns. The relationship between the nasal measurements were studied in 11 proportion indices. Results : Following are our mean values in newborn. Width of the nasal root was 13. 9mm. Width of the nose was 22. lrnm, Width of the columella was 4. 5mm. Height of the nose was 22.6mm. Length of the nasal bridge was 20.1mm. Nasal tip protrusion was 8.9mm. Width of the nostril floor was 6.4mm. Thickness of the nasal ala and length of the nasal ala were 4.0mm, 15.4mm. Length of the columella was 3.9mm. The most common nostril shape was Type II (0-45 degrees in inclination of the nostril axis from the horizontal). Nasal index was 97.8. Columella-nasal tip protrusion length index was 43.9. Conclusion : The development of the columella was relatively incomplete in the case of newborn and was the result to appear. The normal indicies could be used clinically in identifying the it's normality as well as morphologic characteristics of the craniofacial structures. They also could be used in differential diagnosis between the morphologically similar congenital craniofacial anomalies. In preoperative design, in setting the criteria of the postoperative results, and assessing the effect of the operation, Finally, they supply the plastic surgeon and the other specialists in the craniofacial surgery with basic normal population data.

시와 자유와 <죽음> : 김수영론

최유찬 연세대학교 국어국문학과 1985 연세어문학 Vol.18 No.-