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장성규,변상기,이승수,김현수,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Among the cutting process, recently hole processing in one of extensive using. This study, we made use of the 3 point edge drill. Regarding the cutting efficiency, we investigated the shape of cutting hole and studied cutting hole, a slope of center shaft, roundness and surface roughness. By using carbide 3 point cutting edge, compare with 2 cutting edge, it is possible that high precision drill processing and near the hole, at extremely limited area, quantity of magnification is a little big. After 15m cutting distance, a gradient of center shaft values was fixed 22㎛. It is necessary that a sufficient consideration concerned with jig intensity of workpiece, cutting conditions etc.
INVERTED MAXILLARY INCISORS의 외과적 노출과 교정력을 이용한 치험례
이상언,이상훈,장기택 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2
Inverted maxillary incisor is that maxillary incisor rotates to the upward direction. The incisal margin of impacted teeth is palpated at the mucobuccal fold near the labial frenum. Clinicians often confront ectopically erupting teeth in various locations. In the past, extraction of impacted teeth had been performed indiscriminately. The present report provides three examples of correction of inverted maxillary incisors with surgical intervention & orthodontic appliance. Through surgical exposure & direct bonding of lingual button, the central incisors were brought into proper eruption path with elastic traction. The case 1 & 2 were treated successfully. They resulted in good positioning, esthetics & adequate width of keratinized gingiva. However, The case 3 resulted in root dilaceration & subocclusion. But its vitality & mobility were normal, then the tooth was restored by the crown and treatment outcome satisfied patient & parents. Thorough differential diagnosis make us avoid disappointing results. This present approach provides me with an esthetic & functional results.
조선업 근로자의 누적외상성질환 실태와 누적외상성질환 범용 작업위험도 평가도구를 이용한 작업분석
한상환,백남종,박동현,장기언,이명학,박종태,김대성,이연숙,백경자,신용수,송동빈 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.4
Cumulative trauma disorders were surveyed in a cross-sectional study of 100 male shipyard workers an 43 male office workers. And baseline checklist for risk assessment of cumulative trauma disorders was applicated in a ship making process. Cases of cumulative trauma disorders were defined using physical examinations and electronic diagnostic mathods. Data on demographics, individual factors(medical condition), work organization and psychosocial aspects of work were obtained by questionnaire. Association between the above factors and cumulative trauma disorders were assessed by multiple logistic regression models. 29(29%) participants of male shipyard workers and 4(9.2%) study subjects of male office workers met our case definitions for cumulative trauma disorders. The myofascial pain syndrome of neck muscles(12% of participants) and carpal tunnel syndrome(5% of participants) were the major two medical conditions in shipyard workers. The odds of male shipyard workers for cumulative trauma disorders to male office workers was 3.15 after adjustment of age(95% C. I. : 2.25-5.44). And the variables such as duration of present job, HIVD condition, and surges in workload were associated at least one of the cumulative trauma disorders in the final models(p<0.05). This study indicates that workrelated upper extremity musculoskeletal disorders are relatively common among shipyard workers, and shows that the psychosocial factors is not likely to be related to the occurrences of these disorders in heavy workers. Also we developed baseline checklist for risk assessment of cumulative trauma disorders. The checklist was unique in that its expected users were industrial hygienists and occupational healthing nurses who did not have much ergonomic background and in that it was targeted to Korean workers in various types. As the first application of the checklist, shipyard workers were evaluated.
공터키안(Empty sella)을 동반한 급성췌장염으로 발현된 부갑상선 선종 1예
전언주,오지혜,배경륜,장샛별,전승운,정의달,손호상,원규장 영남대학교 의과대학 2009 Yeungnam University Journal of Medicine Vol.26 No.1
The incidence of coexisting hyperparathyroidism and empty sella syndrome is rare and the etiology and incidence of their coexistence is not known. The association of hyperparathyroidism and the empty sella syndrome may be related to multiple endocrine neoplasia (MEN) syndrome due to a genetic disorder. We experienced a rare case of hyperparathyroidism presenting as acute pancreatitis combined with empty sella. We report here a 37-year old female who manifested epigastric pain because of acute pancreatitis. She had hypercalcemia due to parathyroid adenoma. A pituitary gland was not visible in the sella turcica on MRI scans. On genetic analysis, she did not show a mutation of the MENIN gene. Empty sella is thought to be a coincidental finding with hyperparathyroidism.
Drill가공에 있어서 ADI재료의 절삭성에 관한 연구
조상순,조규재,전언찬,장성규 東亞大學校 大學院 1995 大學院論文集 Vol.20 No.-
The drilling tests were performed on austempered ductile cast irons(ADI) with 2∼3% silicon to clarify the factors influencing the driling characteristics of ADI material. The machinability of each material was evaluated using high speed steel drills of 4mm diameter. The ductile cast iron materials were austenized at 900℃ for 1 hour and then held at 375℃ for 2 hours. Austempered ductile cast iron containsa great deal of retained austenite which contributes to an improvement of impact strength. The machinability of ADI depends on Si components and machinability of workpice has been proved better 3% Si material with high Si components than 2% and 2.5% Si material. It was found that the tool life was a great affected by the feed rate and as feed rate increses, tool life gradually decreased.
프리셉터 경험이 간호업무수행과 직무만족에 미치는 영향 연구
류언나,송혜숙,장은희,서효신,추연화,김인선,나명주,지성애,박경숙 중앙대학교 간호과학연구소 2001 중앙간호논문집 Vol.5 No.2
The purpose of this study was to investigate how preceptor experience has an effect upon preceptor nurses. This study was so designed that it could compare the difference between clinical performance and Job satisfaction of preceptor nurses and those of nonpreceptor nurses. Study subjects were sampled out from those nurses who worked with two university hospitals where preceptor programs were implemented. The number of subjects totaled to 134, including 69 preceptor nurses and 70 nonpreceptor nurses. The score of preceptor nurses' clinical performance and job satisfaction revealed a higher value than that of nonpreceptor nurses. A similar result was also shown in the subdomains. However these difference were not statistically significant. Among all of the preceptor nurses, the highest number of preceptor experience was just one time. Except for five times in preceptor experience, the more the number of times of preceptor experience, the higher score in clinical performance. It was manifested that the number of preceptor experience was not related to job satisfaction. The score of preceptor nurses' clinica1 performance and job satisfaction revealed a higher value than that of nonpreceptor nurses. A similar result was also shown in the subdomains. However these difference were not statistically significant. The reward that preceptor nurses wished most was a reduction of the work load assigned to them. Currently preceptor nurses are only receiving a small quantity of financial reward related with their preceptor role. Most of preceptor nurses (96.8%) were not satisfied with their existing reward. Almost half of the preceptor nurses(43.5%) did not want to play a role as preceptor again. The reason why the scores of clinical performance and job satisfaction were low might be attributed to the inadequate preceptor training program and reward system. Appropriate knowledge and clinical skill are expected to enhance the level of preceptor nurses' clinical performance and appropriate internal and external reward to elevate the level of preceptor nurses' Job satisfaction. Therefore, it is needed for us to develop more effective preceptor education program, financial reward, support of colleague nurses and nursing managers, and adjust workload for the purpose of more effective preceptor programs.
변상기,장성규,이충엽,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
Cuttingability of carbide step drill is highly progressing the step drill with more then twice diameter rate is so difficult in regrinding and very easy to damage during machining. As the machining of step drill for blind hole is occur to breakage at small diameter position, so it is very difficult to machining. In this experiments, we investigate roundness and surface roughness by machining distance and were identified that the first distance, 5∼10m, was fine with 7㎛ but the around of 15m was happened so much alternation. And we were identified that after 20m was happend stable machining. The surface roughness was happened the same conditions. So application of step drill, we think that the selection of cutting conditions need lots consideration and the study of step drill's diameter ratio is carried out.
싱글 튜브 시스템 BTA 工具를 使用한 SM55C 鋼의 深孔 加工 特性에 관한 硏究
全泰玉,全彦燦,沈成輔,張性圭 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
The BTA deep hole machining has an increasing demand because of its wide applications and its good productivity. The main feature of the BTA drill is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self guidance of the boring head. The BTA drills are capable of machining for having large length to diameter ratio in single pass. The study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. This thesis deals with the experimental results obtained during single tube system BTA machining on SM55C steel for different machining conditions.