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Skin entrance dose for digital and film radiography in Korean dental schools
Cho, Eun-Sang,Choi, Kun-Ho,Kim, Min-Gyu,Lim, Hoi-Jeong,Yoon, Suk-Ja,,Kang, Byung-Cheol 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4
Purpose : This study was aimed to compare skin entrance dose of digital radiography with that of film radiography and to show the dose reduction achievement with digital systems at 11 dental schools in Korea. Materials and Methods : Forty six intraoral radiographic systems in 11 dental schools were included in this study. Digital sensors were used in 33 systems and film was used in 13 systems. Researchers and the volunteer visited 11 dental schools in Korea. Researchers asked the radiologic technician (s) at each school to set the exposure parameters and aiming the x-ray tube for the periapical view of the mandibular molar of the volunteer. The skin entrance doses were measured at the same exposure parameters and distance by the technician for each system with a dosimeter (Multi-O-Meter : Unfors instruments, Billdal, Sweden). Results : The median dose was 491.2 μGy for digital radiography and 1,205.0 μGy for film radiography. The skin entrance dose digital radiography was significantly lower than that of film radiography (p<0.05). Conclusion : Fifty-nine percent skin entrance dose reduction with digital periapical radiography was achieved over the film radiography in Korean dental schools.
趙廣善,權五均,禹建錫 서울대학교농과대학농업개발연구소 1991 서울대농학연구지 Vol.16 No.2
본 연구는 우리나라 총채벌레의 분포 특성과 기주식물을 조사하기 위하여 1987년 6월부터 1990년 7월까지 공시작물을 대상으로 전국적으로 실시하였다. 본조사에서 얻어진 결과는 다음과 같다. 1. 벼에서 조사된 총채벌레는 벼총채벌레 : Stenchaetothrips biformis, 엉겅퀴총채벌레 : Thrips setosus, 중국관총채벌레 : Haplothrips chinensis, 벼관총채벌레 : H. aculeatus 대만총채벌레 : Franklinilla intonsa등 5종이었다. 2. 조미채소류에서는 고추, 마늘, 양파, 파, 참께 등에서 대만총채벌레 : Fr. intonsa등 9종이 조사되었으며, 하와이총채벌레 : Thrips hawaiiensis와 좀머리총채벌레 : Microcephalothrips abdominalis등 2종을 추가하였다. 3. 과채류에서는 파총채벌레 : Thrips tabaci등 7종이 조사되었다. 이들중 중국관총채벌레 : Hap. chinensis, 대만총채벌레 : Fr. intonsa는 조미채소류에서와 같이 기주범위가 넓었다. 4. 파총채벌레 : Thrips tabaci의 기주식물은 Allium속 등 24종으로 밝혀졌다. 5. 우리나라의 총채벌레분포상은 기지종과 미기록종 Thrips simplex등 8종을 추가하여 63종이며 전체의 약 77%가 총채벌레과에 속했다. This study was carried out investigate the fauna of thrips and their relationship to host plants throughout the country from June, 1987 to July 1990. The results of this study were as follows. 1. Stenchaetothrips biformis, Thrips setosus, Haplothrips chinensis, Haplothrips aculeatus, Frankliniella intonsa were found in the rice. 2. Eleven species including Frankiniella intonsa, Thrips hawaiiensis and Microcephalorthrips abdominalis were found in the seasoning fruit vegetables such as red pepper, garlic. onion, welsh onion and sesame. 3. Seven species including Thrips tabaci were found in the fruit vegetables, especially among them, the host range of Haplothrips chinensis and Frankiniella intonsa was very wide. 4. Thrips tabaci was found in 24 species of plants including Allium. 5. Eight species including Thrips simplex were recorded in this study, so the total number of recorded thrips was 63. 6. The fact was known from this study that Family Thripidae included 77% of total recorded thrips in Korea.
조명숙,송근배,윤희숙 대구보건대학 1992 대구보건대학 論文集 Vol.13 No.-
The purpose of the present study was to determine the mercury in human scalp hair and urine from amalgam fillings, sixty-five subjects were examined their oral status, alginate impression were taken to make dental arch stone models and calculated their surface area of amalgam fillings. The 28 control subjects had no amalgam filling and 37 compare subjects had an average of 12 surfaces of amalgam. The morning urine and scalp hair were collected from all subjects and samples were digested in acid digestion bomb(Parr Instrument Company, U.S.A.) The mercury contents were determined with atomic absorption spectrophotometer(Model 551, IL Co., U.S.A.) and atomic vapor accessory (Model 440, IL Co., U.S.A.) . The results obtained were as follows ; 1. The urinary mercury contents of control group(no amalgam in oral cavity) were 2±10.0㎍/g. creatinine/L and compare group(amalgam filling) were 16.7±16.0㎍/g. creatinine/L(p<0.05). 2. The scalp hair mercury contents of amalgam filling group(3.29±1.03㎎/L) were slightly higher than those of the amalgam free group(3.04±1.11㎎/L) but not significant difference(p>0.05). 3. The linear correlation coefficient was 0.3490 and significantly different between mercury content of scalp hair and amalgam surface area(p<0.05), but had no significant difference between urinary mercury contents and amalgam surface area(r=0.0934, p>0.05).
조건우,김희원,권석근,곽은호,문석형 대한방사선 방어학회 1985 방사선방어학회지 Vol.10 No.2
KSC-1 핵연료 수송용기에 대한 방사선차폐해석을 QAD-CG, ANISN-KA, DOT 3.5등의 전산코드와 DLC-23/CASK의 핵단면적 자료를 사용하여 수행하였다. 운반물인 사용후 핵연료집합체로부터 방출되는 중성자 및 감마선의 방사선원항은 ORIGEN-79전산코드를 이용하여 평가하였다. 방사선차폐해석 결과, 1개의 가압경수로 사용후 핵연료집합체를 운반할 수 있는 KSC-1핵연료 수송용기는 정상적인 수송조건에서 뿐만 아니라 가상적인 사고수송조건하에서도 관련 법령에서 정하는 기준을 만족하고 있어 방사선차폐해석의 관점에서 볼 때, 그 안전성이 입증된다. Radiation shield design for a shipping cask, KSC-1, was evaluated to verify that the cask can be used in the transportation of a spent fuel assembly discharged from KNU 5 & 6. Radiation source term of the spent fuel assembly was calculated with the computer program ORIGEN-79, QAD-CG, ANISN-KA and DOT 3.5 codes were used in the shielding calculations and the nuclear cross section data needed was extracted from the DLC-23/CASK library. It is concluded that KSC-1 shipping cask satisfies the requirements specified in the relevant regulations under normal conditions of transport and under accident conditions in transport.
그림좌절 검사와 다면적 인성검사에서 나타난 살인 정신분열증 환자와 정상대조군의 공격반응의 차이
조지희,이근후 大韓神經精神醫學會 1992 신경정신의학 Vol.31 No.3
The purpose of this study was to investigate the difference between normal control group and schizophrenic patients who committed homicidal behavior in response to frustration using P.F.T.(Picture-Frustrations-test) and MMPI. The study subjects were 77 homicidal schizophrenics who were admitted to the Forensic Psychiatric Institution from October, 1989 to February, 1990 and 83 normal control group who had no crime history and psychiatric problem. The following results were obtained : 1) As to the direction in P.F.T., homicidal schizophrenics responded rather in intropunitive or impunitive direction than in extrapunitive direction compared with normal control group. 2) As to the reaction type in P.F.T., homicidal schizophrenics showed more need-persistence(N-P) type and less obstacle-dominance(O-D) type than normal control group. 3) Regarding the superego factors in P.F.T., homicidal schizophrenics showed significantly less socore in E, I, E+E, E-E and M+I response than normal control group. 4) Homicidal schizophrenics exhibited significantly less G.C.R. score than normal control group, which is correlated with sociality and appropriateness for age in response to frustration. 5) In the validity scale of L, F, K and in the clinical scale of D, Pd, Pa, Pt, Sc on MMPI, homicidal schizophrenics remarked significantly high T score than normal control group. Especially in L scale and Pa scale, the difference of two groups was most prominent.