A comparison study between the AESOPUS Low Temperature Opacity and that of Ferguson, on Standard Stellar Models and Isochrones

Yong –Cheol Kim,Minje Beom 한국천문학회 2018 天文學會報 Vol.43 No.1

회맹장 및 대장을 침범한 장 결핵에 있어서 바륨을 이용한 방사선 이중조영촬영 소견에 대한 연구

진용현,전혜정,이용근,강철호,조성범,김윤환,박철민,차상훈,김일영,이혜경 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-

To determine the characteristic double contrast barium enema findings of ileo-cecal and colonic tuberculosis and to make differential diagnosis from other bowel inflammatory disease. Sixty-seven patients confirmed as ileo-cecal and/or colonic-tuberculosis in six hospitals were evaluated retrospectively. The diagnosis was proven by endoscopic biopsy, surgery, and clinical follow up. Nine of 67 patients were excluded because radiologic findings were normal though endocopic biopsy examinations resulted in tuberculosis. Histopathological diagnosis were madein 58 cases as follows: endoscopic biopsy(n=29), operation(n=12), follow up examination(n=14), tissue culture(n=1), laparoscopic biopsy(n=2). There were 30 men and 28 females. The mean age were 36 yrs(range:16-67), 34 patients were in the second and third decade. The distribution of lesions, morphological characteristics, mucosal changes, ulcer shape and depth, associated with other tuberculous lesion, multiplicity were retrospectively analyzed in the findngs of double contrast barim enema. The commonest clinical symptoms were abdominal pain(n=35, 60%) and diarrhea(n=18, 31%). The chest radiography revealed association of pulmonary tuberculosis in 39 cases. Tuberculous lesions of other organs except chest were present in five cases. Double contrast barium enema findings showed a thickening and irregularity of intestinal mucosal fold(n=29, 50%), bowel contraction and/or shortening(n=26, 45%). There were small, nodular, superficial ulcers in the case of ulcer depth less than 2 mm in the depth. As many as 39 cases(67%) in this series had two or more lesions in the intestinal tuberculosis. The involved segment revealed symmetrical feature(n=21, 36%). Inflammatory pseudopolypoid lesions were noted in 30 cases(52%). The ileo-cecal region was involved in 38 cases(66%). The ascending colon(n=25, 43%) was the second commonest site with or without contiguous cecal involvement. Lesions in terminal ileum, ileo-cecal valve, transverse colon, descending colon and appendix were seen in 19, 18, 18, 12 and seven cases, respectively. Among 18 cases of ileo-cecal valve lesions, there were incompetency in nine cases(16%) and wide gapping in four cases(7%). In 14 cases, tuberculous enterocolitis was diagnosed by clinical follow-up and double contrast barium enema study. 12 out of 14 cases, the findings of double contrast barium enema of tuberculous enterocolitis were normalized after anti-tuberculous medication. However, two cases showed more aggravated state than before due to inappropriate treatment. Double contrast barium enema plays an important role in the diagnosis of tuberculous enterocolitis, determines the type, site and extent of the involvement and helps in treatment guide by using sequential studies.

S.D. Rats를 이용 1, 1-Dichloro-1-fluoroethane의 아민성 흡입독성 연구

김현영,이성배,임철홍,김철우,점용현,한정희,전윤석,최수영,강대봉,이용묵 한국환경독성학회 2002 환경독성보건학회지 Vol.17 No.1

There were no specific effects for test materials on Sprague-Dawley (S.D.) rats in clinical symptoms, amounts of food intakes, weight changes, laboratory findings, and pathology after whole body l, l-Dichloro-1 -fluoroethane (used as coolant, metal cleaner and solvents) exposure(0, 1,500, 3,000, and 6,000 ppm) for 13 weeks (6 hour/day, 5 days/week). However, the loss of capillary vessels in eyeball (pupil) was observed in a female rat among 6,000 ppm group. Though there was a tendency for MCHC (Mean Corpuscular Hemoglobin Concentration) in rat to be decreased (p<0.05), it was not regarded as abnormal because the values were within normal limits. In asthma-stimulation related evaluations, there was also a tendency for inflammatory cell counts in bronchoalveolar lavages to be increased. But it had no statistical significance, and also no dependency on sex and the exposed concentration. Based on this result, the non observed effect level (NOEL) induced by 1, 1-Dichloro-l -fluoroethene inhalation was evaluated in groups with 3,000 ppm below (S .D. Rats, 13 weeks). Finally, it was concluded that the short term exposal of 1, 1-Dichloro-l-fluoroethane is not considered as a asthma stimulant by inhalation despite of some study limitations such as test animals use and short-term exposure .

국제전립선증상점수와 요류속도 및 전립선용적과의 상관성에 대한 고찰

이상철,이형래,김용태,김원 大韓泌尿器科學會 1998 Korean Journal of Urology Vol.39 No.4

치과용 시멘트의 열확산도 및 열차단 효과에 관한 연구

이용근,김철위 대한치과기재학회 1987 대한치과재료학회지 Vol.14 No.1

The purpose of this study was to measure the thermal diffusivity of dental cements commercially available in Korea and their thermal insulating effect. and the temperature rise in the pulp chamber simulated to the natural dentition in the mouth. Twenty three kinds of dental cements were used in this study. Seven of the dental cements were zinc phosphate cements, seven of them were polycarboxylate cements, four of them were glass ionomer cements and miscellaneous cements were four kind. The thermal diffusivity of each cements was measured after 1 and 24 hours after the start of mixing and compared with each other group. The temperature rise in the pulp chamber was measured through two discs of 0.5mm dentin and 0.9mm or 1.5mm cement disc by spraying hot water(55℃). From the experiment the following results were obtained: 1. The thermal diffusivity of dental glass ionomer cements was less than that of dental zinc phosphate cements and polycarboxylate cements. 2. The thermal diffusivity of dental zinc phosphate cements and polycarboxylate cements measured after 24 hours was more than that of 1 hour. 3. The thermal diffusivity of dental glass ionomer cements measured after 24 hours was less than that of 1 hour. 4. The thermal insulating effect of dental zinc phosphate cements and polycarboxylate cements was proportional to the thermal diffusivity in the experimental duration.

협력적 커뮤니케이션과 관계몰입간의 관계 : 채널 분위기의 조절효과

황용철 제주대학교 경상대학 경영경제연구소 2000 경영경제연구 Vol.2 No.-

치과용 아말감의 작업표준, 순정중량 및 조작시간 측정

김철위,이용근 大韓齒科器材學會 1992 대한치과재료학회지 Vol.19 No.1

The method of process and the proper working time of dental amalgams were very important factor to restore the tooth accurately. In this study, we inspected the method of process by the manufacturer and determined the net mass and working time (Eames technique) of dental amalgams used in Korea, seven of which were made domestically and fourteen of which were imported. We followed the guidelines of KDA Specification No. 1., KS P 5103., RANSI/ADA Specification No. 1 and ISO 1559. From the experiment, the following results can be drawn: 1. In some of the imported dental amalgam alloys, the type, class, chemical composition, net mass, date of manufacture and lot number were not described. 2. Net mass of one table of dental amalgam alloy was from 285±5㎎ to 402±5㎎. 3. The working time of dental amalgam was from around 3 minutes to 10 minutes.

메세지 전송을 이용한 클럭 동기화에 관한 연구

최용락,박진섭,하수철 大田大學校 1988 論文集 Vol.7 No.1

개량형 치과용 시멘트의 용해도 및 피막도에 관한 비교연구

김철위,김종배,백대일,이용근 대한치과기재학회 1987 대한치과재료학회지 Vol.14 No.1

The purpose of this study was to evaluate the solubility, disintegration and film thickness of twenty-five commercially available cements-zinc phosphate (AD, AS, DH, FZ, GCB, HC, HZ, LZ, LMZ, SC and TZ), polycarboxylate (DA, DR, GCC, HPC, LC, PF, SCB, and SU) and glass jonomer (HB and OS) cements used in Korea. These tests were performed according to the modified methods of KDA Specification No. 1, 2, ISO 1566, 4104, and ANSI/ADA Specification No. 8, 61. The following results were obtained: 1. The solubility of the glass ionomer cements was higher than that of the zinc phosphate and the polycarboxylate cements. 2. The film thickness of the zinc phosphate cements was slightly higher than that of the polycarboxylate and the glass ionomer cements. 3. The solubility and the disintegration of the glass ionomer cements showed considerable differences according to the products.

치과용아말감의 이물질함유량에 관한 연구

김철위,이용근 大韓齒科器材學會 1992 대한치과재료학회지 Vol.19 No.1

The purpose of this study was to investigate the trace metal content of dental amalgams used in Korea. Fourteen species of dental amalgams, 6 of which were made in Korea and other 8 were imported, were studied. They were respectively dissolved in aqua regia and analyzed the content of maganese, cobalt, bismuth, antimony, lead, iron, nickel, cadmium, indium, zinc, arsenic and beryllium by the method of atomic absorption spectrophotometry. From the experiment, the following results can be drawn: 1. The content of the managanese in the dental amalgams was 0.00007% to0.00320%, and the content of the bismuth was 0.00018% to 0.00560%. 2. The content of the lead in the dental amalgams was 0.00170% to 0.05300%, and the content of the iron was 0.00088% to 0.00510%. 3. The content of the nickel in the dental amalgams was 0.00009% to 0.00330%, and the content of the cadmium 0.00005% to 0.00160%. 4. The content of the zinc in the dental amalgams was 0.00040% to 0.94000%, and the content of the arsenic was 0.00050% to 0.00370%.