가변 부피 view cell을 이용한 메탄올/CO₂및 아세토나이트릴/CO₂기-액 상평형

임교빈,유종훈 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-

The phase behavior of Methanol/CO₂ systems was investigated previously by a number of researchers. However, the entire composition range at moderate temperatures was not mapped in a single study Furthermore, extensive acetonitrile/CO₂ vapor-liquid phase information has not been reported. The goals of this research were twofold: (1) to demonstrate the accuracy and precision of visual observation for vapor-liquid phase boundary determination using a high-pressure, variable-volume view cell with the methanol/CO₂ system relative to the data available, and (2) to examine phase behaviors of methanol/CO₂ and acetonitrile/CO₂, commonly used binary fluids for supercritical fluid chromatography and extraction, from 0~1.00 mole fraction CO₂ and over a 25~100℃ temperature range. The results for methanol/CO₂ were found to be very comparable to the literature values.

소아환자의 깊은 진정요법 하에서 근단변위 판막술을 이용한 거대협소대의 치료

김종빈,윤형배 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.1

The mandibular buccal frenum is defined as a fold of mucous membrane at the posterior labial vestibule and attaches the lips and the cheeks to the alveolar mucosa, gingiva, and underlying periosteum. The buccal frenum becomes a problem when its attachment is too colse to the marginal gingiva. It may then pull on healthy gingiva, encourage plaque formation and interfere with tooth brushing. Especially, heavy buccal frenum mucogingivally results in insufficent attached gingiva, inadequate vestibular depth and high frenum attachment and also difficulty in eruption of mandibular premolar. Frenotomy, frenectomy and mucogingival surgery are used in treating heavy buccal frenum. Frenotomy with autogenous free gingival graft has been used popularly because of its stable result. But, it is difficult in younger children because of inadequate donor site, difficulty in making recipient site and behavior management. Frenotomy with apically positioned flap is considered as more efficient way for a very young child with heavy buccal frenum. Additionally, modified deep sedation with N₂O-O₂can be used as an adjunct for the effective treatment outcome. Decrease in muscle pull, adequate width of attached gingiva and increased vestibular depth can be expected from this treatment approach.

흡연에 의한 급성 호산구성 폐렴 2예

박종빈,김학렬,주현준,유태양,신성남,신정현,송정섭,황기은,김소영,양세훈,정은택 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

최근 흡연을 시작한 젊은 성언에서 급성 호산구성 폐렴의 발생에 대한 증례가 보고되고 있다. 급성 호산구성 폐렴은 대개 발열을 동반하기 때문에 초기에는 감염성 폐렴으로 잘못 진단, 치료되는 경우가 많다. 아직 정확한 병태 생리 및 조직학적 소견은 밝혀져 있지 않지만 병력 청취 및 임상 양상, 방사선 소견의 관찰을 통해 급성 호산구성 폐렴을 의심하고, 진단을 위해 기관지 폐포 세척액 검사를 시행한다면 좀 더 쉽게 진단 내릴 수 있을 것이다. 본 저자들은 최근 처음 시작한 흡연에 의해 발생한 급성 호산구성 폐렴을 진단하고, 스테로이드를 투여하여 성공적으로 치료한 환자 2예를 경험하였기에 이를 문헌 고찰과 함께 보고하는 바이다. Acute eosinophilic pneumonia(AEP) is characterized by acute febrile respiratory illness associated with diffuse pulmonary infiltration and pulmonary eosinophilia. The specific etiology for acute eosinophilic pneumonia is elusive. By some investigators, cigarette smoking is suggested as a causative substance which can cause AEP. In recent, the authors experienced two cases of AEP following cigarette smoking. Both cases had characteristic features including age around 20 years, new onset smoking before occurance of AEP, diffuse infiltration on chest radiography, pulmonary eosinophilia based on bronchoalveolar lavage and acute improvement after steroid therapy. These clinical features are resemble with previous smoking induced AEP case reports. Base on these clinical features, cigarette smoking associated AEP could be diagnosed more easily.

최적화 기법으로 시뮬레이티드 어닐링을 이용한 위성체 구조설계

임종빈,박정선 한국항공대학교 항공우주산업기술연구소 2002 航空宇宙産業技術硏究所 硏究誌 Vol.12 No.-

본 연구에서는 인공위성 구조체에 대하여 최적화를 수행하였다. 인공위성 구조체의 최적화는 발사환경을 고려하여 제한조건과 하중 조건을 설정하였다. 또한, 보편적인 최적화 프로그램에서는 다루기 힘든 제한 조건을 고려하기 위한 방법을 모색하였다. 이 방법은 유한요소 해석 프로그램과 최적화 프로그램을 연결하여 최적화를 수행하는 것이다. 이 방법에 의하여 시뮬레이티드 어닐링을 이용한 플랫폼과 추진모듈의 최적화를 수행하였고, 유용한 정보를 얻었다. 본 연구의 결과 인공위성 구조인 플랫폼과 추진모듈의 최적화에서는 응력에 의한 조건보다는 고유진동수에 의한 제한조건이 최적화 수행에 큰 영향을 미침을 알 수 있었다. Simulated annealing algorithm (SA) is applied to optimize satellite structures. In the optimization, constraints concerned with the various space environments are considered. The algorithms are merged into a finite element analysis program for the optimization of the satellite structures. Constraints are take with respect to equivalent stresses and natural frequency and so on. Numerical optimization results from the simulated annealing provide useful fact for designing the satellite structures. The results from the SA may reach close to the optimum design. Natural frequency may play major role in optimization procedures. This research can be applied to optimization of equipment module as well as payload module of satellite and so on.

감초 내 글라브리딘의 Semi-pilot 규모 초임계유체 추출

임교빈,유종훈 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-

The purpose of this work was to study the feasibility of a semi-pilot scale supercritical CO₂(SCCO₂) extraction of glabridin from liquorice. The extraction experiments were carried out at temperatures ranging from 40 to 60℃ and at pressures ranging from 100 to 300 bar. The effects of process variables such as the type and amount of cosolvents, temperature, and pressure on the extraction yield, chemical composition of the extract, and extraction kinetics were investigated in detail. The chemical compositions of the extract were analyzed by high-performance liquid chromatography. Almost no glabridin was extracted at all extraction conditions when only pure supercritical carbon dioxide was employed as an extraction solvent, whereas a significant amount of glabridin was extracted in the presence of cosolvents such as acetone and ethanol. The experimental results obtained in this study revealed that the extraction yield not only increases but the extraction time also decreases as the concentration of cosolvents in SCCO₂ increases up to about 25%. Ethanol was found to be more effective in SCCO₂extraction of glabridin than acetone.

거대고리 착이온 (NiL²)의 낮은 스핀상태(D)와 높은 스핀상태(O)간의 평형

卞鍾轍,韓性彬 제주대학교 1989 논문집 Vol.29 No.-

물, 아세토니트릴, 아세톤 및 니트로메탄에서 Ni(Ⅱ)-tetraamine 착물의 화학평형을 분광착이온의 낮은 스핀(??) 구조와 높은 스핀(??) 구조간의 평형이 니트로메탄을 제외한 물, 아세토니트릴, 아세톤 용액에서 나타났다. 각 용액에서 온도와 〔NaClO₄〕가 증가할수록 이 반응의 평형상수는 감소하였다. 각 용매에서 반응엔탈피와 반응엔트로피는 착물의 전자 스펙트럼에 대한 온도의 영향을 분석하므로써 결정하였다. ??구조인 triplet 화학종의 형성시, 아세토니트릴과 아세톤 용액에서 반응엔탈피(???)와 반응엔트로피(???)는 각각 1.26, 1.32, 그리고 25.01, 54.90이었다. The chemical equilibria of Ni(Ⅱ) - tetraamine(tetraamine = L,2,12 -dimethyl - 3,7,11,17-tetraazabicyclo - 11,3,1-heptadeca-1(17), 2,11,13,15-pentaene) complex ion in water, acetonitrile, acetone and nitromethane were investigated using spectrophotometric method, respectively. The equilibria between low-spin(??) and high-spin(??) structures of Ni-tetraamine complex ion were presented in water, acetonitrile and acetone, but not in nitromethane. The equilibrium constants, the reaction enthalpies and the reaction entropies were determined from analysis of the temperature dependence of the electronic spectra. The formation of the triplet species (??) was found to be exothermic. The solvent and electrolyte spectra. The formation of the triplet species (??) was found to be exothermic. The solvent and electrolyte effects on the equilibrium constants could be explained by the dielectric constants of solvents and the reaction entropries.

[cis-Cr(III)(5,5,7,12,12,14-hexamethy1-1,4,8,11-tetraazacyclotetradecane)(L_(a))_(n)]CLO_(4)(n = 1 or 2)합성과 성질

변종철,한성빈,정덕상,임희정,한충훈 濟州大學校 師範大學 科學敎育硏究所 1995 科學敎育 Vol.12 No.1

rac-5.5.7.12.12.14-hexamethy1-1,4,8,11-tetraazacyclotetradecane hydrate : Lm·H_(2)O was prepared and separated from the corresponding meso-isomer dihydrate according to the Curtis method. The racisomer was confirmed by spectroscopic data of NMR and IR spectroscopy. To synthesize the [CrL_m(OH)₂] complex. the racemic compound purified from meso and racemic mixture was reacted with Cr(II1) salt. The complx ion species {[SrL_m(OH)_(2)]^(+): λ_(max) = 613.0(ε_(max) = 116 M^(-1)cm^(-1)), {[CrLm(OH)(H_(2)O)]^(2+) : λ_(max) = 575.0nm(ε_(max) = 133M^(-1)cm^(-1)). [CrLm(H_(2)O)_(2)]^(3+) : λ_(max) = 532.0nm (ε_(max) = 172M^(-1)cm^(-1))} obtained from pH change of [CrLm(OH)_(2)(OH)_(3)]^(+) solution were confirmed from an electron absorption spectra. The result of the distribution diagram of chemical species proves that main products in the range of solution pH ≤ 3.5 . 3.5 <pH <7, and pH ≥ 7. are [CrLm(H_(2)O)_(2)]^(3+). [CrL_(m)(OH) (H_(2)O)^(2+). and [CrL_m(OH)_(2), respectively. At P~ 2.0, we synthesized several Cr(III)-macrocyclic complexes containing various axial ligands (L_(a) : I, Br^(-), CI^(-), S_(2)O_(3)^(2-), F^(-), malonate, NCS^-, oxalate) instead of H_(2)O. [CrL_m(OH_(2))]^(3+) + L_(a) →[CrL_(m)(L_(a))_(n)]^(+)(n = 1 or 2) Cr(III)-macrocyclic complexes combined with vaious ligands on the axial position were primarily confirmed with the mass spectrum. Especially, when the axial ligands are malonate, oxalate, and S_(2)O_(3)^(2-), a possible thermal decomposition reaction and redox potential are considered as follows: ◁표삽입▷(본문을 참조하세요) As well, a spectrochemical series was drawn up on the basis of the ligand field strength obtained from electron absorption spertra of the complexes, [CrL_(m)(La)_(n)]^(p+) F^(-), CI^(-) ~Br^(-)<I^(-)<S_(2)O_(3)^(2-)<OH^(-)<H_(2)O<mal~NCS^(-) We can expect that there is three d-d transition d^(3) ion Tanabe-Sugano diagram. ◁표삽입▷(본문을 참조하세요) However, we found only two trasitions because the other transition {^(4)A_(2)_g(F)→^(4)T_lg(P) : v_(3)} is obscured by absorption arising from charge transfer transition. ◁표삽입▷(본문을 참조하세요)

재해사례분석을 통한 빌딩공사 재해 특성

이종빈,노민래,고성석 한국안전학회 2004 한국안전학회지 Vol.19 No.3

Recently, construction work's tendency has become a high-rise building, a complexity and a large size. According to the KOSHA data, construction work accidents have not been decreased. Looking at from the side of accident, accidents of construction industry are occupied over 1/3 among all industry accidents. Therefore, this study will analyze the accident of the building construction work from the data of KOSHA which were collected during 11 years(1992 -2002) data relating to serious accidents of the building construction work, suggest the counterplan according to the each work type in building construction work.

국회의원의 지역구대표기능에 관한 일고찰

윤종빈 한국외국어대학교 사회과학연구소 2001 社會科學論集 Vol.19 No.1

잇꽃 Carthamin의 초임계 추출 및 농축

이종민,마상동,한태룡,김공환,임상빈,정인식 경희대학교 생명자원과학연구원 1997 遺傳工學論文集 Vol.9 No.-

Supercritical fluids (SCF) are useful substances that are recently used in bioseparation process. Extraction of carthamin from safflower using supercritical carbon dioxide were examined at various conditions of temperature (35∼40℃), pressure (3000∼5000 psi) and CO₂ flow rate (900∼1200 m/hr). SCF was less effective than solvent methods in carthamin extraction from safflower. Concentration of carthamin was 50% more efficent at the use of alginate beads with 35 g cellulose per column loadings compared to the control (15g cellulose per column loadings).