일산화탄소 중독환자에서 고압산소치료 적응증에 관한 비교평가

유수진,박재황 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

Study objective: To comparative study the results between hyperbaric oxygen therapy and non-hyperbaric oxygen therapy in the these patients, because controversy exists regarding hyperbaric therapy in the drowsy patient with carbon monoxide intoxication. Design: Tetrospective study Setting: The WonKwang university hospital emergency department during january first 1991 through June 31th 1995 Method and result: According to history and carboxyhemoglobin level, we experienced 105 patients of carbon monoxide intoxication admitted to emergency department. Patients intoxicated by other gases and death patients before admission was excluded. According to the indication of the hyperbaric oxygen therapy on carbon monoxide intoxication, 15 patients among 16 patients with coma, semicoma, and stuporous mental state was done. Patient with drowsy mental state was 23 patients, 6 of these patients was done hyperbaric oxygen therapy and remainder was not. Charts of patients with carbon monoxide intoxication including patients with drowsy mental state was reviewed to determine the result between hyperbaric oxygen therapy and non-hyperbaric oxygen therapy. According to clinical features, we found sex ratio(1:1.6), mean age(35.1±19.4years), age range from 1 to 85 years old, 41cases(39%) in 1991, 66cases(62.9%) in alert mental state and 23cases(21.9%) in drowsy mental state The exposure time and time until alert mental status by mental status were 9.5±0.67hours, 18.8±28.3hours in coma mental status. The early laboratory findings were leukocytosis in 39cases(37.1%), increased hematocrit in 20cases(19.1%), increased GOT in 14cases(13.3%), increased GPT in 12cases(11.4%), increased creatinine in 10 cases(9.5%), glucosuria in 17cases(16.2%) and normal arterial blood gas analysis findings except acidemia in drowsy and coma mental status, and most common abnormal findings were seen in stuporous mental status. The exposure time and time until alert mental status by carboxyhemoglobin concentration were no significant statistical result, and time until alert mental status between drowsy and stuporous mental status with hyperbaric oxygen therapy were 3.9±3.04hours. In patients with drowsy mental status, the patients with hyperbaric oxygen therapy that was 3.9±3.04hours in time until alert mental status, 1cases(17%) in carboxyhemoglobin concentration(≥20%), 5cases(83%) in carboxyhemoglobin concentration(< 20%), 1.432.11days in admission period, and patients without hyperbaric oxygen therapy were 9.9±6.04hous in the time until alert mental status. Arterial blood gas analysis between patients with and without hyperbaric oxygen therapy in drowsy mental status were normal findings except acidemia before hyperbaric oxygen therapy. The comparison between hyperbaric oxygen therapy and non-hyperbaric oxygen therapy in patients with drowsy mental status were significant statistical result in time until alert mental status. Conclusion: Although hyperbaric oxygen therapy was done according to the indication in carbon monoxide poisoning, theirs result imply that hyperbaric oxygen therapy is more important than the pure oxygen therapy in patients with drowsy mental status.

초등학교 학생들의 빛에 대한 개념

유병길,곽수연 부산교육대학교 과학교육연구소 2003 科學敎育硏究 Vol.28 No.-

This study examined elementary school students' ideas about light. The results are as follows; Most students think light's travel distance is different between in the daytime and the night. It is because that children's ideas are strongly influenced by their egocentric or human-centered view of the world and that children don't have the scientific model which can integrate a various kinds of same conditions. And the students think light's travel distance is different as the type of illuminant. They think that the strong illuminant like the sun travel so far but the dim light from a candle doesn't go too far. So, we must teach that the light keeps traveling until it reaches something regardless of the type and strength of illuminant. I suggest that these misconceptions must be changed into the scientific concept through enough discussion after the activities.

원호 절삭날 공구에 의한 2차원 절삭에서 칩 분리깊이에 관한 해석적 연구

유수영,조성산 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1

Finite element orthogonal machining model based on Lagrangian formulation requires informations for chip separation depth in order to consider cutting edge roundness effects. This study analytically determines the chip separation depth using the minimum energy principle that chip separation occurs at the depth where cutting energy is minimum. Finite element analysis is employed to estimate chip formation and plowing forces separately with an assumption that primary cutting force can be decomposed into chip formation and plowing forces. Primary cutting force is obtained by superposing the chip formation and plowing forces at various separation depth. It is demonstrated that there exist a depth at which cutting energy is minimum. A finite element simulation of orthogonal machining with a round cutting edge tool is conducted using the chip separation depth predicted in the present study.

부분 무치악 환자에서 마그네슘 이온주입 임플란트의 성공률에 대한 전향적 임상연구

최수정,유정호,이규복,김진욱 大韓齒科補綴學會 2012 대한치과보철학회지 Vol.50 No.3

Purpose: This study examined the clinical success rate of Mg titanate implants (M Implant system, Shinhung, Korea), which employ a Mg coating method, by evaluating the marginal bone loss and implant stability using radiographs and Osstell, over a 1 year. Materials and methods: The locations of the implants placement were divided into 4 areas; the maxillary and mandibular premolars and molars. In the maxilla, 8 and 9 implants were inserted in the premolar and molar areas, respectively. In the mandible, 11 and 51 implants were inserted in the premolar and molar areas. Marginal bone loss and ISQ of all implants (79) were measured after insertion, mounting the prosthetic appliance, and 1, 3, 6, and 12 months after loading. The marginal bone loss was measured from the radiograph using XCP bite, which was customized, and the implant stability measured using Osstell. Fisher's exact test (α=.05) was used to compare the success rates of each region. Results: The mean marginal bone loss for the upper and lower jaws were 1.537 mm and 1.172 mm. The mobility showed a non-significant reduction or increase according with time. The success rates were accounted for 94.12% and 98.39% in the upper and lower jaws; the premolars and molars were accounted for 100% and 96.67%. The two cases of early failure resulted from failure of primary stability during implant insertion. The late failures were not observed for 1 year after adding a loading to the implants. Conclusion: The Mg titanate implant showed good primary stability and good clinical results in both healing and function. 연구 목적: 부분 무치악 환자에서 Mg titanate implant (M Implant system, Shinhung, Korea)의 보철후 1년간의 방사선사진을 이용한 변연골 흡수량과 Osstell을 이용한 임플란트 안정성 평가 결과를 분석하여 임상적인 성공률에 대해 알아보고자 한다. 연구 재료 및 방법: 38명의 환자에 79개의 임플란트를 식립하여 보철 후 1년 동안 변연골 흡수량, 임플란트의 동요도, 임플란트 식립 위치에 따른 분포 및 성공률, 보철 전후에 따른 성공률을 분석했다. 결과: 변연골의 흡수량은 보철물 장착 후 1년간의 평가에서 상악에서는 평균 1.537 mm, 하악에서는 평균 1.172 mm의 변연골 흡수가 관찰되었으며, 전체적인 상하악의 평균 변연골 흡수량은 1.255 mm로 관찰되었다. 수술 후 시간이 경과함에 따라 ISQ값은 미약하게 감소하였다가 증가하는 경향을 보였으나, 상악과 하악 모두에서 식립 당일 이후 예비 인상일, 최종 보철물의 장착일과 주기적인 평가 기간 동안 ISQ값의 큰 증가나 감소를 나타내지는 않았다. 성공률은 상악에서의 94.12%였고, 하악에서의 98.39%였다. 결론: 본 실험의 결과로 미루어 Mg titanate implant는 임상적으로 양호한 결과를 보여주었다.

십이지장 궤양 환자와 만성 위염 환자의 염증 분포의 차이 및 H. pylori 집락도와 염증도의 상관관계

유광하,진춘조,박형석,이재동,김예리,윤성욱,이수인,윤호상 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-

An inflammatory difference between the gastric antrum, body and fundus was studied in 39 H.pylroi positive duodenal ulcer and 29 H. pylori chronic gastritis patients. Also we studied correlation of H. pylori colony count and inflammatory severity. Patients with newly diagnosed duodenal ulcer and chronic gastritis were endoscoped and two biopsy secimens each taken from the antrum, body and fundus. Although intestinal metaplasia in antrum and inflammatory activity in fundus were more severe in chronic gastritis patients. another inflammatory difference was equally likely to be found between two groups. There was no definite histological inflammatory difference between duodenal ulcer and chronic gastritis patients. A positive correlation was found between the number of H. pylori and the severity of inflammation.

응급센터로 내원한 두부외상 환자에 관한 임상적 고찰

유수진,박재황 圓光大學校 醫科學硏究所 1994 圓光醫科學 Vol.10 No.1-2

Retrospective clinical analysis was made on 884 cases of head trauma visited to Emergency Center of Wonkwang University Hospital and was treated in the Department of Neurosurgery from 1991. 1. 1 to 1991. 12. 31. A clinical analysis of 884 cases was performed and following results were obtained. 1. The peak incidence of age was third decade and the sex ratio was 2.1 : 1, predominant in male. 2. The predominant month and seasonal incidence were in October and Autumn, respectively. 3. The cause of head trauma were traffic accidents(69.8%), and next, in order of incidence, fall down(12.4%), slip down(9.5%), and human trouble(4.0%). The kinds of traffic accidents were private vehicle(31.1%), motorcycle (20.6%), truck(12.9%), taxi(7.2%). bongo(9.2%), bus(4.7%). bicycle(9.2%). and cultivator(1.5%). pedestrian's traffic accident was common more than that of Passenger. 4. The regional distribution was Iri(53.8%). Iksan(20%), Okgu and Kunsan (10.0%) 5. The percentage of patients received emergency treatment on scene was 2.9% in Iri-city, 6.7% in Iksan, 18% in Kimje. 92.3% in Buan. 52.2% in Kunsan and Okgu, and 100% in Seocheon. 6. The mental states of patients on arrival to Emergency Center was alert (77.7%). and heavy mental state(10.6%). 7. The interval from injuries to arrival of Emergency Center was within 30 minutes in 50.7%, and was within 3 hours in 86.2%. 8. The loss of consciousness after trauma was shown in 75% of epidural hematoma patients, and severely injured head trauma patients had negative light reflex and positive babinski's sign. 9. The brain CT was performed in 884 cases. Abnormal findings were observed in 290 cases(32.8%), including epidural hematoma(57, 19.6%), subdural hematoma(55, 18.9%), and intracerebral hemorrhage(36, 12.4%). 10. The operation were carried out in 65 cases and mental states after operation showed alert(41.5%), and heavy mental stale (58.5%). 11. 209 cases(23%) had skull fracture, and fracture sites were temporo-parietal region(23.5%). frontal region(14.5%). and skull base(29.9%). 12. The mortality rate at discharge was 51cases(17.6%) among 884cases. 13. In location of hematoma, epidural hematoma was found in temporal region (45.6%), and subdural hematomain frontal region(70.9%). and intracerebral hematoma in frontal region(55.5%). 14 Associated injuries following head trauma were extremity fracture(35.5%). facial fracture(21.9%), rib fracture(9.9%) and spine injury(6.7%) in orders.

주상골 골절에서 Herbert/Whipple 나사못의 바람직한 위치 : 모형연구 A Model Study

유재두,김종오,윤여헌,고영도,배서영,이정준 대한골절학회 2002 대한골절학회지 Vol.15 No.4

목 적 : 주상골 골절 치료에 사용하는 Herbert/Whipple 나사못의 바람직한 삽입 위치를 알아보고자 하였다. 대상 및 방법 : 4개의 사체에서 분리한 주상골을 이용하여 각 주상골마다 12개씩 주물 모형을 제작하여 대상으로 하였다. 각 모형에서 핀 삽입 안내 장치(jig, Zimmer??)를 이용하여 안내핀(guide wire)을 원위부에서 근위부를 향해 삽입하되 원위부에 A, B, C, D의 4개 근위부에 0, 5, 10의 3개의 지점을 설정하여 총 12가지 방법으로 삽입하였다. 각 모형은 주상골의 장축에 직각인 방향으로 근위부, 요부, 원위부의 세 단면을 만들고 핀 삽입의 흔적과 가장 가까운 피질골 표면과의 거리를 측정하여 이 거리가 대적으로 길 때 안전한 것으로 평가 하였다. 결 과 : 핀 삽입의 흔적과 가장 가까운 표면과의 거리가 근위부에서는 D5, 원위부에서는 C10이 유의하게 길었다. 원위 삽입 위치를 기준으로 하였을 때 근위부에서 C가 유의하게 거리가 길었고 요부, 원위부, 그리고 근위 목표 지점을 기준으로 하였을 때의 측정된 거리는 유의한 차이가 없었다. 결 론 : Herbert/Whipple 나사못의 삽입 위치는 근위부 골절에서는 D5군, 원위부 골절에서는 C5군이 가장 바람직한 위치라고 할 수 있엇고 요부 골절에서는 A0군과 D0군을 제외하면 별 다른 차이 없이 비교적 안전하다고 할 수 있다. 바람직한 위치 선정을 위해서는 근위부의 목표지점보다 원위부의 지점을 정확히 하는 것이 중요하다고 사료된다. Purpose : To evaluate optimal placement of the Herbert/Whipple screw in scaphoid fracture Materials and Methods: Forty eight model molded from four cadaver scaphoids were used for this study. Using the Herbert/Whipple jig, the guide wire was placed distal to proximal into each scaphoid with twelve method which were four entry points and three target points. Guide wire placement was then evaluated with three planes in the proximal, middle, distal planes and distance from the nearest cortex. Results : The most concentric position in the proximal plane was D5, in the middle plane C10. As distal entry point, the most concentric position in proximal plane was C. There were no statistical concentric, as middle, distal plane, and proximal entry point, Conclusion : The most ideal placement were D5 in proximal fractures of the scaphoid, C5 in distal fractures. In waist fractures of the scaphoid, there were relatively safe, except A0 and D0. The position of entry points was more important than that of target points for ideal screw placement.

두부외상 환자에 관한 임상적 고찰

유수진,박재황 대한응급의학회 1993 대한응급의학회지 Vol.4 No.2

Retrospective clinical analysis was made on 884 cases of head trauma visited to ER of WonKwang University Hospital and was treated in the Department of Neurosurgery from 1991. 1. 1. to 1001. 12. 31. A clinical analysis of 884 cases was performed and following results were obtained. 1) The peak incidence was at the age of third decade and the sex ratio was 2.1 : 1, predominant in male. 2) The predominant month and seasonal incidence were October and Autumn. 3) Traffic accidents form the largest group(69.8%), and next are, in order of incidence, falldown(12.4%), slipdown(9.5%), human trouble(4.0%), and The kinds of vehicle were private vehicle(31.1%), motorcycle(20.6%), truck(12.9%), taxi(7.2%), bongo(9.2%), bus(4.7%), bicycle(9.2%), and cultivator(1.5%). passenger's traffic accident was more than pedestrian. 4) The regional distribujtion was Iri(53.8%), Iksan(20%), Okgu and Kunsan(10.0%) 5) The percentage of emergency treatment on scene was Iri(2.9%), Iksan(6.7%), Kimje(18%), Buan(92.3%), Kusan and Okgu(52.2%), and Seocheon(100%). 6) The mental states at arrival to Emergency Room was alert(77.7%), and heavy mental state(10.6%). 7) The interval within 30 minutes from injury to Emergency Room was 50.7% and within 3 hours was 86.2% and it was rather faster than expected. 8) The loss of consciousness after trauma was epidural hematoma 75%, and severely injured head trauma patients have negative light reflex and positive babinski's sign. 9) The brain CT was performed in 884 cases. abnormal findings were observed in 32.8%, in cluding epidural hematoma(19.6%), subdural hematoma(18.9%), and intracerebral hemorrhage(12.4%) 10) The operation were carried out in 65 cases and mental states after operation showed alert(41.5%), and heavy mental state(58.5%). 11) Skull facture were 209 cases(23%), and fracture sites were temporoparietal region(23.5%), frontal region(14.5%), and skull base(29.9%). 12) The mortality rate at discharge was 17.6%(51cases). 13) In temporal region 45.6% were found in epidural hematoma, and frontal region were found in subdural hematoma(70.9%) and intracerebral hematoma(55.5%). 14) associated injuries following head trauma were extremity fracture(35.5%), facial fracture(21.9%), rib fracture(9.9%) and spine injury(6.7%) in orders.

응급센터로 내원한 복부자상 환자의 임상적 고찰

유수진,박재황 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Study objective : To refer the management of patients with stab wound to abdomen, because controversy still exists regarding management of patients whenever exploratory laparotomy or selective management. Design : Retrospective study Setting : The WonKwang university hospital emergency department during January lst 1989 through December 31th 1994 Participants : 62 patients was admitted after abdominal stab wound Method and intervention : Charts of all patients with abdominal stab wound was reviewed to determine the result between operative management and non-operative management according to surgical indication, paracentesis, peritoneal lavage or abdominal computerized tomographic scan. Patients was discharged from emergency department or transferred to other hospital was excluded. Measurement : There were 62 patients admission to general surgery after abdominal stab wound. Sixty-one patients were alive and one patient were died. The patients grouped as operative management(A group) and non-operative management(B group). A group was 50 patients(80.6%) according to surgical indication, paracentesis, local wound exploration, or abdominal C-T scan.,B group was 12 patients(19.4%). According to clinical features, we found sex ratio(M : F, 4 : 1), 13cases in 1990, spring in 22cases(35.6%), time of injury from 20hour to next 4hour in 35cases(56.5%), no jab in 18cases(29%), knife in 47 cases(75.8%), epigastrium in 16cases(26%), interval from injury to admission within 30minute in 22cases(35.5%), homicide in 49cases(79.1%). The surgical indication were peritoneal irritation(70.9%), next, in order of incidence, loss of bowel sound(53.3%), shock(32.2%), evisceration(19.4%), and free air(1.6%). In the operative group(A group), we found positive paracentesis in 10cases(83%), positive abdominal C-T finding in 5cases(45.5%), positive peritoneal lavage in 2cases(100%), but in the non-operative group(B group), negative abdominal C-T finding in 2cases(100%) and negative peritoneal lavage in 6cases(100%). The organ which most common injured was small bowel(11cases, 22%) and colon(9cases, 18%). The negative exploration was 15cases(30%) in A group, delayed operation was none. The surgical complication was 12% in A group and no in B group. The average hospital stay were 9.7days in A group and 3.8days in B group. Conclusion : The negative operation ratio was high in operative group. These results imply that must be selective management by physical finding and use of diagnostic method including local wound exploration, diagnostic peritoneal lavage, paracentesis, abdominal sonography and abdominal C-T scan because of higher negative operative ratio.

환경친화형 수분산성 불소 아크릴레이트 공중합체에 의한 섬유 표면개질

유수용,김정두,문명준,서차수,주창식,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10

Waterborne fluorinated acrylate copolymer (WFAC) for surface modification of textile was synthesized from perfluoroalkyl ethyl acrylate, octadecyl acrylate, glycidyl methacrylate, surfactant and 3,3 methyl-methoxy butanol. The structures of the synthesized WFAC were determinated by FT-IR and ^(19)F-NMR analysis. The thermal stability investigated with DSC and TGA was decreased with increasing the content of fluorinated acrylate in the copolymer. However, the particle sizes of WFAC were increased with increasing the content of fluorinated acrylate in the copolymer. The surface energies calculated by contact angles of WFAC were in the range of 29.80~3.41 dyne/cm. On the observing SEM of the textile surface treated with WFAC, the textile was swollen and compacted with increasing the concentration of water repellency agent. WFAC synthesized in this study showed a good water repellency.