6-hydmxydopamine 파킨슨병 모델에서 Apomorphine의 투여에 따른 회전운동 변화의 시간적 추이

홍근식,김병곤,전범석,윤병우,이광우,노재규,이상복,명호진 대한신경과학회 1999 대한신경과학회지 Vol.17 No.1

FT-IR을 이용한 치면열구전색재의 탄소이중결합량 분석

이용근,장광수 원광대학교 생체재료·매식연구소 1996 원광생체재료·매식 Vol.4 No.3

The degree of polymerization of cross-inked polymer has great importance in determining the mechanical properties and clinical availability of materials. Residual double bonds have been implicated in causing reduced wear resistance, strength and color stability. IR spectroscopy has become very popular for the determination of degree of the double bond conversion. The object of this study was to evaluate the differences of remaining aliphatic carbon double bond(RB) content of pit and fissure sealants after immersion in four kinds of solutions for 15 days. One kind of chemically cured pit and fissure sealant and three kinds of light cured pit and fissure sealants were studied. The concentration of available carbon double bonds in the uncured sealants was determined in the transmission mode and converted to absorption mode, a layer of unpolymerized sealant was sandwiched between two potassium bromide discs. Spectra from 16 scans over the 2,000∼1,000 cm^-1 were obtained. Specimens 20 mm in diameter and 0.15 mm in thickness were made according to the manufacturer's instructions. 10 minutes after the start of polymerization, the specimens were immersed in 4 solutions, 1 M lactic acid solution, 1 M acetic acid solution, 75% ethanol solution, and normal saline. One was not immersed as a control. At the time of storage in a 37℃ incubator for 3 days and 15 days, the specimen was sandwiched between two potassium bromide (KBr) discs and FT-IR scan was taken by the same methods as the uncured sealants. Using standard baseline technique, the intensities of the C=C absorption peak at 1635.78 cm^-1 and the C....C reference peak at 1608.78 cm^-1 were measured by peak-picking procedure The ratio of aliphatic carbon double bond to aromatic double bond in uncured pit and fissure sealants was 1.112∼1.564. The percentage of RB after storage for 3 days was 59.8∼90.4%. After 15 days it was 56.3∼76.3%. In chemically cured pit and fissure sealants, there was no significant difference in RB stored for 3 days storage specimens. In light cured pit and fissure sealants, the percentage of RB after storage in ethanol for 15 days was reduced significantly (p<0.05) compared to that of after 3 days.

口蓋裂 患者에 있어서 口蓋 成形術後 鼻咽腔 閉鎖에 關한 臨床的 硏究

고광희,신효근 全北大學校 齒醫學硏究所 1991 전북치대논문집 Vol.9 No.1

In order to find the causes of velopharyngeal incompetency after primary palatorrhaphy in cleft palate patients, we analyzed the form and function of the velopharyngeal space of fifteen operated cleft palate patients and five normal subjects. The velopharyngeal function was evaluated by lateral cephalometric radiography, velopharyngography and hypernasality cul-de-sac test. The obtained results were as follows 1. The rate of velopharyngeal incompetency was twenty percent, three of the fifteen operated patients. Two of them were complete cleft palate and the other was incomplete one. 2. The length of soft palate and levator eminence were longer in normal group than those of good speech group and complete cleft palate group during phonation of /i/ (P<0.05). The lengthening rate of soft palate was smaller in good and poor speech group than that of normal group(P<0.05) and, reduced in order, normal group, complete cleft palate group and incomplete palate group(P<0.05). 3. The nasopharyngeal distance had no significant difference between all groups at rest, but, smaller in normal group than that of both cleft palate group(P<0.05), good speech group and poor speech group(P<0.05) during phonation of /i/. The difference in nasopharyngeal distance between rest and /i/ phonation was greater in normal group than that of both cleft palate group, good speech group and poor speech group. 4. The moving distance of soft palate reduced in order, normal group, incomplete cleft group, complete cleft palate group(P<0.05). 5. The distance between lateral pharyngeal wall had no significant difference between all groups in rest, but, smaller than that of complete cleft palate group in normal group(P<0.01) and increased in order normal group, good speech group, poor speech group(P<0.01) during phonation of /a/. The mobility of lateral pharyngeal wall was reduced in order, normal group, good speech group, poor speech group(P<0.01). 6. There was low corelationship between the mobility of lateral pharyngeal wall and soft palate. Therefore, it suggest that the movements of lateral pharyngeal wall and soft palate occurs independently.

상악골 결손 환자의 보철물 장착전후 음성변화에 관한 임상적 연구

송광엽,신효근,신금백 全北大學校 齒醫學硏究所 1993 전북치대논문집 Vol.11 No.1

The degree of hypernasality has been assessed by the listener's judgements, but perceptual assessments have poor scientific reliabilities. So the objective instruments with diagnostic accuracy have been needed to test hypernasality. This study analyzed the nasalance score using Nasometer after prosthetic treatments in three patients with hemimaxillectomy. The simple vowels, /a/ and /i/, were tested for the degree of hypernasality before and after prosthetic treatments. Also we used high-speed analysis system using PC with DSP for assessment of resonance. The testing words were consisted of simple vowels, /a/ and /t/. The obtained results were as follows. 1. Nasalance of the patients with prosthetic treatments were decreased about 25∼93%. 2. The first Formants of the patients with prosthetic treatments were decreased, and these results showed the forward movements of tongue. 3. The voice onset time has decreased by 56.57ms in comparison with preprosthetic state, and these results meant articulation reactions after prosthetic treatments were better than those of preprosthetic state.

소파커버의 연소특성에 관한 연구

이광흠,박영근,윤명오,현성호,김동일 한국화재소방학회 2003 한국화재소방학회논문지 Vol.17 No.2

본 연구는 다중이용업소에서 사용하고 있는 실내내장재료 중 소파커버의 인조가죽 5종에 대하여 연소시 위험성 요소인 착화성, 난연성, 열방출율, 독성가스를 평가하였다. 연구결과 Artificial Leather 1~5의 착화온도는 427~43℃, 산소지수는 19~20%로 나타났다. 또한 25 kw/m²의 복사열에서 착화시간은10~16초, 최대열방출율은 147~277 kW/ m²이었으며, 35 kW/ m²의 복사열에서 착화시간은 6~9초, 최대열방출율은 176~296 kw/m² 및 일산화탄소(CO)는 5,550~6,290 ppm, 이산화탄소(CO²)는 18,5OO~23,400 ppm, 염화수소(HCl)는 110~140 ppm, 시안화수소(HCN)은 13~65 ppm, 질소산화물(NO_(x))은145~220 ppm이 발생하는 것으로 나타났다. In this study, we tried to evaluate the ignitibility, flammability, heat release rate, and toxicity of five different types of burning artificial leather sofa covers that are widely used in entertainment service industry buildings. As the results of this study; Putting the artificial leathers under fire conditions we found out following results : auto-ignition temperature was 427~437℃, limiting oxygen index was 19~20%; at heat flux of 25 kW/ m², ignition time was 10~16s and peak heat release rate was 147~277 kW/m²; and at heat flux of 35 kW/ m², ignition time was 6~9s and peak heat release rate was 176~296 kW/ m². The toxic materials discharged from the burning leathers were 5,550~6,290 ppm of CO, 18,500~23,400 ppm of CO², 110~140 ppm, of HCl, 13~65 ppm of HCN and 145~220 ppm of NO_(x).

응급실의 약물중독 환자

송근정,조광현,이한식 大韓應急醫學會 1992 대한응급의학회지 Vol.3 No.1

Any short of medical drug, insecticide or foods sometimes makes harmful situation whether it is beneficial or not. Nowadays, the treatment for drug intoxication started mostly in emergency department. The initial treatment must start as soon as possible. The prognosis is depend upon a kind of drug, exposure time and time of initial treatment. Authors conducted a review of acute poisoned patients seen from April 1983 to July 1992, who visited emergency department of Yong Dong Severance Hospital. The results were as follows, 1. The patients of Drug intoxication account for 0.68% of total emergency department patients. 2. Male to female ratio was 1:1.9 and the age distribution revealed a high incidence in second decade(35.7%) 3. From all the cases of drug intoxication and 67.2% was done on purpose. 4. The drug used were sedatives, CO intoxication, pharmaceuticals, pesticide, in order. 5. Admission rate was 23.8% and mean hospital day 6.0 days. 6. ICU admission rate was 30.0% and mean staying time was 4.7 days.

발포폴리스티렌비드를 사용한 경량콘크리트의 역학적 특성에 관한 실험적 연구

주재금,이종찬,오세출,유택동,정광량,서치호 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to obtain basic data on the properties of the lightweight concrete within expanded polystyrene beads for various applications in the field. Inquiring into the change of the properties as altering cement matrix mixture and the capacity mixture ratio of expanded polystyrene beads, the mixture plane of this study is set up as W/C is fixed 50%, expanded polystyrene beads is increased 10% from 0% to 80% per 1m³ and the ratio of cement:sand in the cement matrix is 1:0, 1:0.5, 1:1. The results of this study are as follow. The slump as changing the mixture ratio of expanded polystyrene beads decrease smoothly until mixture ratio 50% but decrease rapidly being in excess of 50%. The density decrease regularly as the mixture ratio of expanded polystyrene beads increase but the ratio of strength decrease. The difference of cement matrix. The strength of cement matrix having more sand mixture ratio relatively decrease rapidly as increasing the mixture ratio of expanded polystyrene beads. It is judged decreased strength phenomenon as the quantity of coherent material created in the mixture decrease rapidly.

광합성세균에 의한 미생물막의 형성

오광근,이철우,전영중,이재홍 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6

홍색비유황 광합성세균인 Rhodopseudomonas capsulata를 선택하여 packed-bed reactor에서 미생물막을 형성할 때, porous ceramic bead가 다른 담체에 비해 우수하였고, 일정한 유입농도하에서 체류시간(hydraulic retention tiem, HRT)이 짧을수록 미생물막 형성이 양호하였으며, 그 때 반응기내의 세포농도는 11,400mg/l로 현탁처리시의 세포농도에 비하여 3~8배 증가하였다. PBR에서 미생물막의 형성은 cell attachment, microcolony formation, biofilm formation의 단계를 거쳐 형성되는 것으로 관찰되었으며, PBR이 FBR보다 안정적인 미생물 부착을 보였고 특히 PBR에서는 BOD용적 부하가 15gBOD/ℓ·day 이상이 되어도 미생물막의 부착비율은 90% 이상을 유지하였다. 전자현미경으로 담체의 표면 및 내부에 고정화된 광합성세균을 확인할 수 있었다. The formation of microbial films(biofilm) by a non-sulfur phototrophic bacteria, Rhodopseudomonas capsulata, on inorganic media was studied. Porous ceramic beads(PCB) were superior to other immobilizing media for the biofilm formation in a packed-bed reactor. It was found that the formation of microbial films favored a lower hydraulic retention time, showing a higher ratio of cells attatched to the media to those suspended in the solution. The cell concentration in the biofilm reactor was as high as 11,400 mg/ℓ, which is 8-folds of the cell concentration in a ordinary suspended treatment. It was observed that the formation of microbial film by R. capsulata followed a general serial process of cell attachment, microcolony formation, and biofilm formation. The microbial films thus formed was very stable even for an extremely high volumetric BOD loading rate of 15 gBOD/ℓ·day. The scanning electron micrographs of the microbial films showed that the cells were attached to both the surface and pores of the media.

γ선에 의한 말단팬텀에서의 선량분포 연구

이원근,김광표 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-

In 1995, The American National Standard Institute(ANSI) is planning to release a standard for the performance testing of personnel extremity dosimeters as ANSI N13.32 standard. The standard is applicable to a personnel extremity dosimeter process used for determing the dose equivalent to the extremities at the reference depth of 7㎎/㎠, as recommended by the International Commission for Radiation Units and Measurements Reports 39. In this study, theoretical calculations of dose equivalent were performed by using a Monte Carlo N-particle transport code for the two types of extremity phantom: one to represent a lower arm or leg composed of tissue and bone to test wrist or ankle dosimeters, and the other to represent a finger to test ring of hand dosimeters. The dose equivalent of the two extremity phantoms by taking consideration of the distribution of absorbed dose due to the interaction of homogeneous parallel broad beam of monoenergetic primary photons in the range between 15 keV and 1.5 MeV result from the kerma approximation with the Monte Carlo method.

사회인구학적 특성에 따른 중학생들의 여가활동실태와 욕구성향에 관한 연구

이광근,강종구,이일재 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.4

The objectives of this paper is 1) to find the problems in the attitude and current state toward recreation and present some resolutions to them, and 2) to prevent the wrongdoing and rear the healthy emotion among the middle school students. The subjects of this study consisted of 600 middle school students in J-city and K- province. However, 29 subjects were ruled out in the process of the analysis because they answered the questionnaire insincerely or their answers were considered lacking in reliability. As a result, only 571 subjects were used for the analysis. In order to analyze the collected data proper to the objectives of this study, the statistical technique used for the analysis of the study were t-test by T-TEST procedure in the SAS Package and FREQ procedure fot the ratio. Results obtained through the above method and procedure of this study were as follows: First, the differences in the state of recreation activity between city area students and countryside area ones. 1) Countryside students have more average recreation time in week days, but they have less average recreation time on weekends. 2) The countryside parents are less interest in recreation time activity. 3) City students are more satisfied with sports facilities. 4) City students have more allowance and spend more money for the recreation. Watching TV is the most favorite recreation activity and city students spend more time in watching TV. Second, the differences in the tendency of desire between city area students and countryside area ones. 1) City students answer that they need more recreation activity. Third, the differences in the state of recreation activity between boy-students and girl-students. 1) Boy-students have more average recreation time. Girl-students are less satisfied with recreation time. 2) Girl-students are less satisfied with sports facility and recreation facility. On the whole, boy-students make use of playground of a school as sports place, but girl-students, their homes. 3) Watching TV is the most favorite recreation activity and girl students spend more time in watching TV. Fourth, the differences in the tendency of desire between boy-students and girl-students. 1) For the boy-students, the most favorite sports activity is soccer, and basketball and baseball follows For the girl-students, the most favorite sports activity is badminton, and dancing and swimming follow. 2) For the boy-students, the most needing recreation facility is one for physical education, and a theater for the teen agers and lounge follows. For the girl-students, the most needing recreation facility is a theater for the teen agers, and facility for public entertainment and disco theque follow. In addition, common opinions among all categories of the study are as follow. 1) They all think recreation activity help them to improve themselves. On the whole, friends and mass media affect them in the recreation activity. 2) They answer that recreation activity is necessary to their daily life, and friends and themselves are considered rightest partners in the recreation activity. 3) Recreation activity is discouraged by the excuses such as 'it causes the low academic record 'I have no time'.