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김지용,임현술,정회경,이현경,강흥식 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1
Hydrofluoric acid is one of strongest irritating, corrosive and poisonous inorganic chemicals. The most significant chronic consequence of excessive fluoride exposure is the disorder of skeletal system and connective tissue. The first stage of osteofluorosis consists of an increase in the density of flatbone such as pelvic bone and vertebral bones, with coarseness and blurring of bone trabecular. Therefore we wanted to observe the change of the bone density among workers exposed to hydrofluoric acid. Questionnairs and radiological investigations were performed for 39 hydrofluoric acid manufacturing factory worker sexposed to hydrofluoric acid. And then authors checked urinary fluoride level by fluoride ion method. The radiographs were doubly read by two radiologists for reliability. The results were as follows; 1. There was a significant difference in urinary fluoride level(p<0.01), but not in age, in tenure(p>0.05) among workers by the job title. 2. By the two radiologists, eight cases were read as bone fluorosis. The prevalence rate of bone fluorosis was 20.5%. 3. There was not a significant difference in general characteristic such as age, tenure and in muculoskeletal signs and symptoms between the fluorosis group and the normal group. 4. However, a close relationship between the occurence of the change of bone density and the degree of fluoride exposure such as burn was found. The difficulties in diagnosing fluorosis result from the questionable sensitivity of x-ray techniques and from the non-specific associated signs and symptoms. A quantitative method such as densitometry to assessosteosclerosis and bone structure alteration and a follow-up study are needed.
이현경,김지용,성낙진,홍성태 동국대학교 경주대학 1996 東國論集 Vol.15 No.-
목적: 간흡충증에서 초음파검사의 진단적 가치를 알아보기 위하여 본 연구를 시행하였다. 대상 및 방법: 1996년 5월 한달 동안 간흡충의 농후유행지인 형산강 유역 포항지역의 436명의 자원자를 대상르로 초음파검사, 피내반응검사, 대변검사를 시행하였다. 이후 대변검사를 기준(gold standard)으로하여 초음파검사의 민감도, 특이도, 양성예측도 및 음성예측도를 알아보았다. 결과: 간내담관의 확장 및 담관주위 에코를 양성 소견으로 하였을 경우 초음파검사의 민감도 65.5%, 특이도는 64.6%, 양성예측도는 38.2%, 음성예측도는 84.3% 이었다. 결론: 초음파검사는 피내반응검사보다 민감하지는 못하나 특이적이었다. 그리고 피내반응검사 양성자에게 초음파 검사를 시행하는 것은 진단기준의 특이도를 높여 주는 효과가 있었다. Objectives: In this study we aimed to evaluate the diagnostic value of sonography on clonorchiasis. Subjectives and Methods: During a month, May 1996 sonographic examination, skin test, and stool examination were performed to 436 volunteers of Pohang which is located along the Hyong-San-Gang river and is one of well known endemic areas. Sensitivity, specificity, positive predictive value(PPV), and negative predictive value(NPV) of sonography were determined while stool examination was assumed as a gold standard. Results: The sensitivity of sonography was 65.5%; specificity, 63.2%; PPV 38.2%; NPV, 84.3% if both intrahepatic duct dilatation and periductal echogenicity were assumed as positive findings. Conclusions: Sonography was less sensitive but more specific than skin test. And sonographic examination perfomed to skin test positive subjects could increase the specificity of diagnostic criteria.
최영민,차천석,김지훈,서현경,양인영 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
The front-end side members of vehicles absorb the most of the energy during the front-end collision. These side members are mostly consist of single hat shape. The side members absorb more energy under axial load if they have higher strength, and stable folding capacity (local buckling). When structural members are subjected to axial loadings, stress is concentrated on their edges. Thus, in this study, the energy absorption characteristics of the member were analyzed according to change of sectional shape for increase of strength. The side members consist of single hat, double hat, single cap and double cap section member. Based on the static test result of these side member, the impact simulation were carried out and compared with test result.
스케일링 건강보험 급여화사업 이후의 스케일링에 관한 인식에 영향을 미치는 요인
이경희 ( Kyeong-hee Lee ),손지영 ( Ji-young Son ),이행옥 ( Haeng-ock Lee ),신송희 ( Song-hee Shin ),전현지 ( Hyeon-ji Jeon ),유환준 ( Hwan-jun You ),문선호 ( Seon-ho Mun ),김지연 ( Ji-yeon Kim ) 한국치위생학회 2017 한국치위생학회지 Vol.17 No.3
Objectives: The purpose of this study was to examine the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public. Methods: In order to examine the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public, study subjects were selected from those who are over 20 years old, living in Seoul and Gyeonggi province since December 2016. Among 300 selected subjects, data of 279 subjects were used for the analysis which is 93% of selected data, except 21 data with insufficient responses. Results: Results of examined factors affecting the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public show that the recognition about scaling after national health insurance benefit is affected by female (p<0.05), past smoker (p<0.01), exercise more than 3 times a week (p<0.05) and 1-2 times a month (p<0.001) in order. Conclusions: It is necessary to prepare a plan to properly inform the national health insurance benefit for dental scaling and to raise the recognition about the necessity of scaling.