비피리딘과 금속이온을 이용한 기능성 포접체의 생성에 관한 연구

권윤정 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-

The crystal structure of the title complexes was determined by X-ray diffraction measurements. Tightly packed porphyrin molecules stack to form arrays of parallel channels in which a remarkable variety of guest species are accommodated. Construction of inner cavities in the solid composed mainly of organic compoments is attractive since function of the inner cavity become designable. This paper reports two kinds of complexes composed of metallic ion and bipyridine(bpy) when Cd2+ was treated with bay in different composition of solvents. Identification of the features of the molecular structure responsible for the versatility of tetraarylporphyrin-based clathrate lays the groundwork for the development of new microporous materials.

최근 6년간 연세의료원에서 경험한 한국인 안면골 골절에 대한 임상적 연구

권준호,이충국,이의웅,민우석,윤중호,박형식 大韓顎顔面成形外科學會 1989 Maxillofacial Plastic Reconstructive Surgery Vol.11 No.1

This is a series of continuing research on facial bone fractures of Koreans worked by Dept. of Oral and Maxillofacial surgery, Dental College of Yonsei University, Seoul, Korea, since 1972. The study was based on a series of 630 patients with facial bone fractures treated as in patient at Yonsei Medical Center, Yonsei University, during the period of Jan. 1982 through Dec, 1987. The results obtained are as follows: 1. The ratio of Men to Women was 4.3 : 1, and admissions for facial bone fractures have been increased year after 1984. 2. The age frequency was highest in the third decade(38.3%). and fourth, second, fifth decade in orders. 3. The traffic accident was the most frequent cause of facial bone fractures(51.3%). 4. The most common location of facial bone fractures was the Mandible(35.3%), and Zygoma complex(29.8%), Nasal bone(15.0%), Maxilla(11.0%) were next in order of frequency. 5. In 291 patients of Mandible fractures, 226(77.7%) had fractures only in Mandible and 65(22.3%) had another facial bone fractures. The most frequent fracture site of mandible was the Symphysis(43.0%) and Angle(22.4%), and Simple fracture was the most frequent in type of fracture(66.9%). Intermaxillarty fixatin & Open reduction was major method of treatment(36.9%). 6. In 394 patients of Midface fractures 323(82.0%) had fractures only in Midface and 71(18.0%) had another facial bone fractures. The most frequent site of Midface fractures was zygoma complex & zygomatic arch(42.7%), and Simple fracture was the most common type of fractures. Observation(Maxilla :44.2%, Zygoma :51.0%) and Open Reduction(Maxilla :20.0%. Zygoma :23.5%) were the major method of treatment. 7. The frequency of Nasal bone fracture was about 1/5 of Midface fractures, and Closed Reduction(42.2%) was the major method of treatment. 8. The complication was reported in only 16 patients, and Malunion was the major complication. 9. Head(44.4%), Lower extrimities(14.5%) and Eye(12.3%) were injured commonly with facial bone fractures. 10. The elapsed time from injury to hospital was within 24 hours in 73.8% of patients, however 15.5% of patients arrived the hospital 72 hours after injury.

유용성 도료와 수용성 도료의 유해성 비교에 관한 연구 : 자동차 보수용 도료를 중심으로

권은혜,김광식,오정룡,최정근,정윤석,이유진,김은아,송세욱,정호근 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.1

The purpose of this study is to substitute water-based painting materials for the current solvent-based ones used in motor-repairing process to minimize the exposure of organic solvents to the painters. This study assessed the exposure of organic solvents to the painters using water-based and solvent-based painting materials and compared compositions, painting processes and the health hazards of the application of these alternative painting materials. The results of this study are as follows. 1. solvent-based painting materials used in motor-repairing process consist of various organic solvents, which consist primarily of toluene, xylene, ethyl benzene, ethyl methyl bezene, trimethyl bezene, ethyl acetate, butyl acetate, methyl isobutyl ketone, 2-ethoxy ethanol, 2-ethoxy ethyl acetate and toluene-2.4-diisocianate and the others. These organic solvents are know as health-hazardous substances. But water-based painting materials are high-solid, low-solvent ones and consist of such two organic solvents as 2-butoxy ethanol and 2-heptanone and the others. 2. The painters using solvent-based painting materials in motor-repairing process are exposed to various organic acetate, methyl isobutyl ketone, trimethyl benzene, 2-ethoxy ethanol, and 2-ethoxy ethyl acetate. But the painters using solvent-based ones are only exposed to 2-butoxy ethanol and 2-heptanone. 3. By using water-based painting materials in stead of solvent-based painting materials containing health-hazardous organic solvents, the exposure of such organic solvents in the painter's breathing zone can be largely prevented. 4. This study recommends water-based painting materials as substitutes for the current solvent-based ones used in motor-repairing process to minimize the exposure of organic solvents to the painters.

유전체 공진기를 이용한 개인휴대 통신용 대역통과 필터의 설계 및 구현

권정열,이헌용,홍성용,윤중락 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-

In this paper, the band pass filter for personal communication services was constructed and designed using λ/4 TEM mode dielectric resonators with a (Zr0.65,Sn0.35)ATi1.04O4.04 ceramic of dielectric constant εr=37.8, Qxfo=48.600 temperature coefficient of resonant frequency rf=7ppm/˚C, and Unloaded-Q (Qo) of λ/4 TEM mode dielectric resonator with inner hole size 0.9㎜ and external size 3㎜ using silver electrode is 354.5 at 1950MHz. For the band pass filter design and construction, the design theory and simulation results of band pass filter using J-inverter theory have been studied. The parameters which are evaluated by design theory are practically applied to the filter construction and the simulation results are in agreement with the measured results after fine tunnings.

황정(黃精) 추출물의 화학구조결정에 관한 연구 (Ⅰ)

윤중호,박주희,김정주,권기락,안철진,주우홍,강진호,신동수 Institute of Genetic Engineering Changwon National 1998 Gene and Protein Vol.2 No.1

본 연구에서는 황정 속에 포함되어 있는 생리활성 물질을 hexane, CHCl₃과 n-butanol층에서 각각의 성분들을 추출하였고, hexane층에서 분리된 화합물 I과 H 중에서, 화합물 I의 봐학구조를 ¹H-nmr, ??, DEPT135, COSY, HMQC, HMBC 스펙트럼 및 MS 스펙트럼 등의 분광학적인 방법에 의해 결정하였다. 화합물 I의 구조는 9,12-(9E, 12E)-octadecadienoic acid 임을 확인하였다. In this Paper, biologically active compounds were extracted using organic solvents as hexane. CHC1₃, n-butanol to give each component. Chemical structure of compound I was characterized using ¹H-nmr, ??, DEPT135, COSY, HMQC, HMBC spectrum and MS-spectrum, in separated compound I and Ⅱ from hexane layer. Finally, chemical structure of compound I was determined as 9,12-(9E,12E)-octadecadienoic acid.

소아 안과 환자의 질병별 고찰

권정윤 慶北大學校 醫科大學 1997 慶北醫大誌 Vol.38 No.2

1996년 일년동안 본원 소아안과에 내원하여 같은 병명으로 3회 이상 경과관찰을 하였던 6세이하의 아동 312명에 대하여 질환별 분류를 시도하였다. 가장 빈도가 높았던 것은 역시 굴절이상이었으며 그 다음이 사시였고 그리고 안검이상이었다. 남녀의 성비는 비슷하였고 굴절이상은 원시안이 근시안보다 2배정도 많았으며 사시환자중에는 내사시 42례 외사시 60례였다. 312명 624안중 약시안은 230안이었으며 이중굴절성이 129안, 부동시성이 30안, 사시성이 29안이었으며 향후 시각장애를 초래할 가능성이 높은 기질성안이상도 27안이나 있었는데 그 원인으로는 수정체이상, 녹내장, 각막이상 망막과시신경이상 등이었다. 금번 소아안과환자의 병류별고찰을 통하여 소아에서 비교적 흔히 볼 수 있는 안이상으로는 굴절이상과 사시였으며 이들이 내원하는 시기는 과거에 비하여는 훨씬 빠른 것 같았으나 아직도 내원시기가 늦은 경우가 있어 이에 대한 계몽이 계속 필요할 것으로 사료되며 또 장래 시각장애아로 판정될 소지가 있는 경우 이들에 대하여는 향후 법적 또는 제도적 장치가 있어야 될 것으로 사료된다. Visually handicapped children are a complex and heterogenous group. Although there is a large amount of information potentially available about them, the subject is important one for several reason : for the individual child, the early recognition of visual handicap may allow effective treatment. Recognition is important also because visual handicap may have serious implications for many developmental function. Finally, an understanding of the epidemiology of childhood visual handicap may enable us to reduce its occurrence in future generations. The authors performed this clnical study to investigate several possible causative ocular abnormality of visual problems for 312 patients under age of 6 who visited Pediatric Ophthalmologic clinic at The Kyungpook National University Hospital from January to December in 1996. We analyze the type of ocular abnormal findings. Among 312 child, the most common abmormality was refractive errors being 262 (84%). The following in order were strabismus ; 112, lids problems ; 28 (9%), cornea, optic nerve, and lens. Among the patients with refractive errors, hyperopia were more prevalent than myopia. Among 112 strabismus patients, esotropia were 42 and exotropia 60 and hyptropias 10. Amblyopic eye were 201patients, 230 eyes. Of the 230 amblyopic eyes, 129 eyes were refractive and the others were anisimetropic ; 30, strabismic; 29, organic; 27, and unexplained ; 15 in orders.

살균방법을 달리한 시유의 저장성

정인철,권수득,문윤희 慶星大學校 1994 論文集 Vol.15 No.2

Experiments were carried out to investigate market milk treated by LTLT, HTST, UHT methods and analysed storage stability of these products at 5℃ and 30℃ by 24 hour interval. In case of LTLT, storage periods were possible to 6 days in 5℃, thermophile bacteria was more than HTST and UHT. Storage stability during stored in 30℃ was impossible only one day, psychrophile bacteria was more than HTST and UHT. In case of HTST, storage periods were possible to 6 days in 5℃, psychrophile bacteria was more than LTLT and UHT. Storage stability during stored in 30℃ was impossible only one day. In case of UHT, storage periods were possible to 7 days in 5℃, storage stability except boiling test was safe to 1st and thermophile bacteria was more than LTLT, HTST during stored in 30℃.

API 기준에 근거한 RBI 절차 개발 및 소프트웨어의 구현 (Ⅱ) : 준정량적 접근법 Semi-Quantitative Approach

송정수,심상훈,권정락,윤기봉 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

During the last then years, the need has been increased for reducing maintenance cost for aged equipments and ensuring safety, efficiency and profitability of petrochemical and refinery plants. American Petroleum institute(API) developed a code, API 581 for proposing standard procedures of risk based inspection. Even though the API 581 code covers general RBI procedures, there must be some limitations. In this study, a semi-quantitative assessment algorithm for RBI based on the API 581 code was reconstructed for developing an RBI software. The user-friendly realRBI software is developed with a module for evaluating semi-quantitative risk category using the potential consequence factor and the likelihood factor. Also, inspection planning module for inspection time and inspection method for equipments are included.

Plasma arc curing system을 이용한 브라켓의 접착에 관한 연구

김정윤,김종수,권순원 大韓小兒齒科學會 2001 大韓小兒齒科學會誌 Vol.28 No.4

최근에 소개된 Plasma arc lamp를 이용한 고광도 광조사기는 조사되는 광도를 크게 증가시켜 필요한 조사시간을 단축시키고자하는 연구의 결과중 하나이다. 교정 임상에서 브라켓의 접착시 고광도 광조사기를 사용하여 시술시간을 줄인다면 환자 뿐만 아니라, 술자에게도 시간적이나 경제적으로 많은 도움을 줄 것이다. 이 연구의 목적은 Plasma arc light를 사용하여 접착시킨 브라켓의 치면에 대한 전단강도를 측정하고 이를 기존의 할로겐 램프를 이용한 광중합 방법과 비교해보기 위함이다. Ⅰ군은 할로겐 램프를 사용하는 XL3000??을 이용하여 총 50초간 광중합하였고 Ⅱ군은 plasma arc lamp를 사용하는 Flipo??를 이용하여 2초간 광중합하였으며 Ⅲ군도 Filpo??를 이용하여 총 5초간 광중합하여 전단강도 측정을 시행한 결과는 다음과 같다. 1. 세 군의 전단강도의 평균은 비슷한 수치를 나타내었다. 2. 세 군간의 통계학적 유의 차가 없었다(p>0.05). Recently, plasma arc curing system for curing resin composites has been introduced. This is characterized by a high output of light energy, which has the advantage of reducing the chair time and thereby making the treatment more comportable for the patients as well as for the dentist. The purpose of this study was to compare the shear bond strengths of light-cured orthodontic adhesive polymerized with conventional halogen light and plasma arc light. The 2 curing devices used were the XL2000 (3M, USA) conventional curing light and the Flipo (LOKKI, France) plasma arc light. The results from the present study can be summarized as follows; 1. The mean shear bond strength for three groups were quite similar for 50 second conventional light group, 2 second plasma arc curing light group, 5 second plasma arc curing light group. 2. There was no statistically significant difference for three groups(p>0.05).

메탄 발생억제형 매립지 개발에 관한 연구

김정권,윤태경 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-

This study aims to observe the inhibition of methane generation, the decomposition of organic matter, and the trend of outflowing leachate, using the simulated column of the anaerobic sanitary landfill structure of sulfate addition type which is made by adding sulfate to a current anaerobic landfill structure, and the simulated column of semi-aerobic landfill structure in the laboratory which is used in the country like Japan in order to inhibit methane from a landfill site among the gases caused by a global warming these days, and at the same time to promote the decomposition of organic matter, the index of stabilization of landfill site. As a result of this study, it is thought that the ORP(Oxidation Reduction Potential) of the column of semi-aerobic landfill structure gradually represents a weak aerobic condition as tine goes by, and that the inside of landfill site is likely to by in progress into anaerobic condition, unless air effectively comes into a semi-aerobic landfill structure in reality as time goes by. In addition, it can be seen that the decomposition of organic matter is promoted according to sulfate reduction in case of R1, a sulfate-added anaerobic sanitary landfill stricture, and that the stable decomposition of organic matter in R1 makes a faster progress than R2. Moreover it can be estimated that R1, a sulfate-added anaerobic sanitary landfill structure has an inhibition efficiency of 55% or so, compared with R2, a semi-aerobic landfill structure, in the efficiency of inhibiting methane.