• 대한방사선기술학회지:방사선기술과학
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• 제33권2호
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• pp.93-96
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• 2010

슬관절 후방십자인대 손상이 의심되는 응급환자의 슬대퇴 관절을 촬영하기 위한 보조기구를 제작하고 그 유용성을 평가하고자 하였다. 실험 방법은 2006년 1월부터 2006년 12월까지 슬관절 손상으로 을지대학병원에 내원한 환자 중 후방십자인대 손상 의증으로 Knee post stress view와 Knee Merchant view 그리고 보조기구를 이용한 Knee post stress view를 모두 촬영하고, 무릎 MRI(Knee MRI)검사를 시행한 17명을 대상으로 하였다. $170{\times}50{\times}70\;cm$의 보조 기구를 제작하였으며 Knee post stress view와 보조기구를 이용한 Knee Seo's view에서 경골의 후방전위 간격을 측정하여 유용성을 평가하였다. 그 결과 보조기구를 이용한 Knee Seo's view가 기존의 Knee post stress view에 비해 후방십자인대 손상 여부의 판단이 더 정확한 것으로 나타났다. 기존 촬영법의 경골 후방전위 간격 차이는 $6.17{\pm}3.04$이었으며, 보조기구를 이용한 촬영법의 경골 후방전위 간격 차이는 $8.74{\pm}4.47$이었다. 결론적으로 자체 제작 보조기구를 이용한 슬대퇴 관절 촬영법은 기존에 슬관절면 손상을 보기 위한 Knee Merchant view와 후방십자인대 손상을 보기 위한 Knee post stress view를 동시에 1회 촬영으로 끝낼 수 있었으며, 기존의 Knee post stress view 보다 후방십자인대 손상 여부를 보다 정확하게 알 수 있었다. 따라서 후방십자인대 및 슬대퇴 관절 손상이 의심되는 응급환자에서 talometer나 MRI 검사의 선행 검사로 유용하게 이용될 수 있을 것으로 사료된다.

• 대한의용생체공학회:의공학회지
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• 제37권6호
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• pp.215-221
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• 2016

Conformity between the femoral component and tibial insert within the knee replacement may be measured in frontal or sagittal view, and shows differences in the curvature radius of the femoral component depending on the flexion angle, i.e., curvature radius has a complex effect on contact stress. Therefore, it is essential to confirm how the curvature radius effects contact stress, and provide an important variable to reduce contact stress. This study correlated contact stress with curvature radius measured in frontal and the sagittal views and confirmed the effect of curvature radius for assessment of the Newly Designed Unicompartment Knee Replacement (NDUKR). Finite element models were constructed for NDUKR and $Zimmer^{(R)}$ Unicompartment High Flex Knee Replacement system (ZUKR), incorporating the curvature radius as measured in either frontal or sagittal view. The femoral component had 1200N of compressive load applied approximately 1.65xbody weight. Contact stress was predicted at flexion angles $0^{\circ}C$, $30^{\circ}C$, $60^{\circ}C$, $90^{\circ}C$ and $120^{\circ}C$, for NDUKR: 42, 47.7, 47.7, 51.2, and 54.1 MPa, and ZUKR: 41.2, 49.5, 53.2, 54.3, and 57.4 MPa, respectively. Correlation analysis showed the influence of curvature radius measured from the sagittal view was larger than for frontal view.

• 대한가정학회지
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• 제37권7호
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• pp.95-110
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• 1999

The purpose of this study is to analyze a relationship among the perceived rural life, daily life stress and life problem behavior of the rural adolescents. To Analyzed the relationships between the view on rural life, daily life stress and the life problem behavior, the survey was conducted on 366 rural high school students, during the period between July 1 to 9 in 1998. The major findings are summarized as follows; 1. Among the independent variables, the sex and the record influenced on the perceived rural life, daily life stress and life problem behavior. 2. There is the negative correlation between the view on rural life and the daily life stress. And also, there is the positive correlation between the daily life stress and the life problems behavior.

• 한국직업건강간호학회지
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• 제16권2호
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• pp.139-146
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• 2007

Purpose: The purpose of this research is to understand the relationship between emotional labor and job stress for clinical nurses. Method: The information for this research has been gathered in method of questionnaire for 202 nurses working in a hospital from January 30 to February 10, 2006. Results; The emotional labor for clinical nurses showed 2.43 on a scale of 4 and the job stress showed 49.84 out of 100. The correlation between the emotional labor and job stress showed that the emotional labor was higher, job stress was also higher. The result was that the factors that influenced the emotional labor were health status in a subjective point of view, working department, and the personality. The factors that influence job stress were self-efficacy, working department, and health status in a subjective point of view. Conclusion: The result of the research showed that emotional labor and job stress for clinical nurses were high and the strategy for reduction in those two areas is needed. Especially, diversified plans for job demand and occupational climate in an area of job stress that is correlated to emotional labor will be needed to minimize the emotional labor and job stress.

• 한국안전학회지
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• 제26권3호
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• pp.83-90
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• 2011

It is well known that urgency resulted from time stress can be a great cause to industrial accidents. Therefore, time stress has been studied in the aspect of macroscopic view, namely industrial safety management, but has not been studied in microscopic view such as psychophysiological approach. Among diverse psychophysiological indices, Electroencephalogram(EEG) would be on of the most objective psychophysiological research technique on human errors though few research has been taken yet. This study aimed to get characteristics of human error while committing a simple arithmetic addition task by utilizing the power spectrum technique of EEG data. Each experiment was composed of 2 tasks under different condition - with and without time stress. As subjects, 5 young undergraduate students in their early twenties participated in this study. The results advocated a well-known fact that time stress downgrades the performance of human workers. However, correct answer rate and response time were not significantly influenced by time stress factor which might be explained by the constructural factor adopted in the present study. As in the previous studies, among various EEG-related measures, relative band power ratios of ${\alpha}$ and ${\beta}$ waves to sum of ${\alpha}$,${\beta}$,${\theta}$ wave powers, namely $P_{{\alpha}/({\alpha}+{\beta}+{\theta})}$ and $P_{{\beta}/({\alpha}+{\beta}+{\theta})}$ seemed to be the most effective measures to grasp variation of brain activities in time-stressed situation so that discussions were expanded about their variations.

• 한국생산제조학회지
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• 제8권1호
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• pp.142-149
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• 1999

A machine frame has been manufactured by casting. However, due to the development of the industrial society, 3-D duties was refused. Especially, the declination of the casting industry makes it difficult to produce the frame. Many companies still manufacture the small casting products. The large casting products are extremely limited and manufactured for their own use. Therefore, it is difficult to keep the term of order. In this study, the characteristics of steel structure which is produced by welding were identified in the view of mechanical strength of steel structure which is produced by welding were identified in the view of mechanical strength to substitute steel structure for casting frame. But welding structure has the residual stress, HAZ and welding deformation. Residual stress and HAZ especially cause crack growth. The proposed steel structure, based on the simulation and experiment(tensile curve and S-N curve), can reduce not only the producting term but also the weight of the frame.

• 대한기계학회논문집
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• 제5권4호
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• pp.354-361
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• 1981

This study aims to compare stress concentratior factors in a loaded elastic body of the infinite plate with pressure coefficients of a fluid in the potential flow. First in view of hydrodynamics, when a single elliptic cylinder in the form of a bluff body stands in the potential flow, the pressure distribution(doefficient, C$\_$p/around the elliptic cylicder which is changed according to the position(angular displacements)is theoretically analyzed and calulated; secondly, in view of theory of elasticity, when an eliptic hole which is made on a flat plate gets tension, the stress distribution(factor) around the elliptic hole which is changed according to the position(angular displacements )is theoretically(K$\_$t/) and experimentally (K$\_$e/) measured; and finally. The results are compard and examined.

• 한국방사선학회논문지
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• 제5권4호
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• pp.201-205
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• 2011

아급성기 발목염좌 환자의 진단에 임상에서 주로 이용되는 방법으로 내.외반 스트레스 검사(ankle stress-varus, valgus) 및 전방 당김 검사(anterior-draw)와 MRI 검사에 의한 연부 조직과 근육, 인대의 질환이 진단가치가 높다라는 관점에서 주로 이용하고 있다. 진단적 가치에 대한 부분의 차이점은 적으나 MRI 검사의 경우 시간적 경제적 부담이 큰 만큼 두 가지의 대표적 검사를 비교 하여 (특정 병원의 환자 그룹을 대상으로 연구를 진행) 단순방사선 검사에 의한 족근골 질환의 진단이 MRI 검사에 비하여 유용성과 효율성이 낮지 않다는 결과를 도출 할 수 있었다.

• Toxicological Research
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• 제22권3호
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• pp.253-266
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• 2006

Bone is a dynamic tissue that is constantly being remodelled. Resolution of bone and formation of new bone are closely linked, so that bone mass remains constant. With age, this process becomes unlinked with an imbalance in bore resorption and formation that results in a net loss of bone. Especially, osteoporosis is a disease characterized by low bone mass with age. One form of aging-related primary osteoporosis is postulated with the reduction of circulating estrogen, rapid bone loss occurs as a result of enhanced bore remodelling with an excess of resorption over bore formation. The oxidative stress is also involved in the pathogenesis of osteoporosis. Oxidative stress by cytokines, such as IL-a and TNF-${\alpha}$, inhibits osteoblast function in vitro and stimulates osteoblast apoptosis resulting in an imbalance in bore remodelling. The present article reviews the current perspectives on the interaction between bone remodelling and factors such as estrogen and oxidative stress, providing an interpretation of bone diseases in a view of molecular mechanisms.

• 대한치과보철학회지
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• 제43권6호
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• pp.727-735
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• 2005

Statement of problem. Platform switching in implant prosthesis has been used for esthetic and biological purpose. But there are few reports for this concept. Purpose. The purpose of this study is evaluation of platform switching in wide implant by three dimensional finite element analysis. Materials and Methods. The single implant and prosthesis was modeled in accordance with the geometric designs for Osstem implant system. Three-dimensional finite element models were developed for (1) a wide diameter 3i type titanium implant 5 mm in diameter, 13 mm in length with wide cemented abutment, titanium alloy abutment screw, and prosthesis (2) a wide diameter 3i type titanium implant 5 mm in diameter, 13 mm in length with regular cemented abutment, titanium alloy abutment screw and prosthesis(platform switching) was made for finite element analysis. The abutment screws were subjected to a tightening torque of 30 Ncm. The amount of preload was hypothesized to 650N, and round and flat type prostheses were loaded to 200 N. Four loading offset point (0, 2, 4, 6 mm from the center of the implants) were evaluated. Models were processed by the software programs HyperMesh and ANSA. The PAM-CRASH 2G simulation software was used for analysis of stress. The PAM-VIEW and HyperView were used for post processing. Results. The results from experiment were as follows; 1. von Mises stress value is increased in order of bone, abutment, implant and abutment screw. 2. von Mises stress of abutment screw is lower when platform switching. 3. von Mises stress of implant is lower when platform switching until loading offset 4 mm. 4. von Mises stress of abutment is similar between each other. 5. von Mises stress of bone is slightly higher when platform switching. Conclusion. The von Mises stress pattern of implant components is favor when platform switch ing but slightly higher in bone stress distribution than use of wide abutment. The research about stress distribution is essential for investigation of the cortical bone loss.