• 한국도로학회논문집
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• 제16권5호
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• pp.143-154
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• 2014

PURPOSES : This study drew factors affecting motorcycle accidents in Seoul by severity using an ordered probit model and aimed to analyze and verify the drawn influence factors. METHODS : As the severity of the accidents could be classified into three types (fatal injury, serious injury and minor injury), this study drew the factors affecting accidents by a comparative analysis employing an ordered probit model, removed the variables that would not secure significance sequentially to construct a model with high explanatory power regarding the factors affecting the severity of motorcycle accidents, and calculated the marginal effect of each factor to understand the degree of each factor's impact on the severity. First, Model 1 put in all variables; Model 2 was constructed by removing the variables of the road surface conditions that could not meet the level of significance (p=0.608); Model 3 was constructed by removing gender variable (p=0.423); and Model 4 was constructed finally by removing age variable (p=0.320). RESULTS : As a result of an analysis, statistically significant variables were time of occurrence, type of accident, road alignment and motorcycle displacement, and it turned out that the impacts on the severity were in the following order: a road alignment of left downhill, the type of motorcycle-to-vehicle accidents and a road alignment of a flatland on the left. The significance of the models was tested using the likelihood ratio, the level of significance and suitability statistics about them, and as a result of the test, the significance level and suitability of the constructed models were all excellent. In addition, the model accuracy indicating the accuracy of a predicted value compared to that of the value actually observed was 70.3% for minor injury; 70.1% for serious injury; and 68.6% for fatal injury, and the overall accuracy was 70.2%, which was very high. CONCLUSIONS : As a result of an analysis of motorcycle accidents in Seoul through the ordered probit model and the marginal effect, it turned out that their severity increased in nighttime accidents as compared to daytime ones and gradually increased in the order of motorcycle-to-vehicle accidents, motorcycle-to-person ones and the ones involving motorcycle only. As a result of an analysis, the severity of accidents in road alignments of left downhill, left flatland and straight downhill increased as compared to those in a road alignment of straight flatland and that the severity of accidents of motorcycles with a displacement larger than 50cc was higher than that of those with a displacement smaller than 50cc.

• 한국산학기술학회논문지
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• 제11권8호
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• pp.2899-2905
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• 2010

임상정보모델이 전자건강기록시스템에서 활용되는 임상정보의 의미적 호환성을 보장하기 위해서는 그 목적과 기능이 반영된 개발원칙이 필요하다. 본 연구는 임상정보모델의 개발원칙을 개발하고, 이 원칙을 적용하여 임상정 보모델인 임상콘텐츠모형을 평가하기 위한 목적으로 수행되었다. 개발원칙의 정의를 위한 연구대상은 (1)정의 (2)기능 (3)품질 요건을 고찰하고, (4)선진 모델의 구성 요소와 같은 선행 연구였으며, 연구기간은 '08년 11월부터 '09년 3월까지였다. 본 연구는 3단계로 진행되었으며 개발단계에서는 선행 연구 문헌에서 주제어와 주제어구를 도출하고, 이의 임상적, 기능적 중요도와 빈도를 기준으로 개발원칙을 확정하였다. 적용단계에서 개발원칙을 이용하여 임상콘텐츠모형 30개를 임상정보모델 전문가 3인이 평가하였다. 환류단계에서 평가 대상 중 오류가 발견된 임상콘텐츠모형이 수정되었다. 연구 결과 구조, 과정, 내용의 3개 범주로 구성된 18개의 개발원칙이 도출되었다. 임상콘텐츠모형을 평가한 결과 개발원칙을 준수하지 않은 것은 총 17개였다. 환류 과정에서 개발원칙의 심화교육, 개발원칙을 이용한 정기적질 향상 전략이 수립의 필요성이 제기되었다. 본 개발원칙은 개발자에는 모델 개발 기준으로, 평가자에게는 모델의 질 평가기준으로도 활용될 수 있으며, 궁극적으로는 임상정보모델의 질 향상에 기여할 수 있을 것으로 기대한다.

• Journal of the korean society of oceanography
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• 제34권1호
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• pp.1-21
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• 1999

A two-layer quasi-geostrophic numerical model is used to investigate the temporal variability of the East Korea Warm Current (EKWC), especially the separation from the Korean coast and the generation of warm eddies. An attention is given on the active role of the nonlinear boundary layer process. For this, an idealized flat bottom model of the East Sea is forced with the annual mean wind curl and with the inflow-outflow specified at the Korea (Tsushima) and Tsugaru Straits. Two types of separation mechanisms are identified. The first one is influenced by the westward movement of the recirculating leg of the EKWC (externally driven separation),the second one is solely driven by the boundary layer dynamics (internally driven separation). However, these two processes are not independent, and usually coexist. It is hypothesized that 'internally driven separation' arises as the result of relative vorticity production at the wall, its subsequent advection via the EKWC, and its accumulation up to a critical level characterized by the separation of the boundary flow from the coast. It is found that the sharp southeastern corner of the Korean peninsula provides a favorable condition for the accumulation of relative vorticity. The separation of the EKWC usually accompanies the generation of a warm eddy with a diameter of about 120 km. The warm eddy has a typical layer-averaged velocity of 0.3 m/s and its lifespan is up to a year. In general, the characteristics of the simulated warm eddy are compatible with observations. A conclusion is therefore drawn that the variability of the EKWC is at least partially self-excited, not being influenced by any sources of perturbation in the forcing field, and that the likely source of the variability is the barotropic instability although the extent of contribution from the baroclinic instability remains unknown. The effects of the seasonal wind curl and inflow-outflow strength are also investigated.

• 대한간호학회지
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• 제25권4호
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• pp.790-806
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• 1995

The present study examined the causal relationships among nurses' job environment /job characteristics(work overload, lack of autonomy, professional role conflict, interpersonal relationships), maturity, job stress, job satisfaction and turnover intention by constructing and testing a theoretial framework. Based on Katz and Kahn's (1978) theory of organizational open system and Kahn, Wolfe, Quinn, and Snoek's (1964) theory of stress, nurses' turnover intention, job satisfaction and job stress were conceived of as outcomes of the interplay between personal characteristics and work environment. Personal aspects associated with outcome variables included professional knowlege and skill, and maturity(challenge, commitment, control, responsibility). The work environment factors involved work overload, lack of autonomy, professional role conflict, and interpersonal relationships (social support). Three university hospitals located in Seoul were selected to participate. The total sample of 443 registered nurses represents a response rate of 96 percent. Linear structural relationships (LISREL) technique was used to test the fit of the proposed conceptual model to the data and to examine the causal relationships among variables. The result showed that both the proposed model and the modified model fit the data excellently, revealing considerable explanatinal power for job stress and job satisfaction. The explanatory power of turnover intention was relatively lower than those of stress and satisfaction. In predicting nurses' stress, satisfaction and turnover intention, the findings of this study clearly demonstrated that professional role conflict might be the most important variable of the all the environmental variables and personal characteristics. The results were dis-cussed, including directions for the future research and practical implications drawn from the research were suggested.

• 무역상무연구
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• 제33권
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• pp.221-243
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• 2007

A party to a contract is bound to perform its contractual duties. But outside events may make performance impossible, physically or legally. In such a situation a party may wish to plead "force majeure" as an excuse for failure to perform. The laws of most countries have provisions which dealt with force majeure. These provisions, however, vary from country to country and may not meet the parties' requirement in international contracts. Therefore, parties to international contracts are frequently in need of contract clauses on force majeure. There are many force majeure clauses in standard forms or individually negotiated. The ICC has drawn up provisions which aim at providing assistance for parties when they are making contracts. The force majeure clause grants relief from contractual sanctions and includes provisions for suspension and termination of contract. The purpose of this study is to examine "ICC Force Majeure Clause 2003" in the international sales contract. For this purpose, firstly this study deals with the major contents of the ICC Force Majeure Clause 1985 and 2003. Secondly this study considers the related provisions under CISG, PICC, PECL and the force majeure clause in Model International Sale Contract. Thirdly this study compares ICC Force Majeure Clause 2003 with the relative provisions under CISG, PICC, PECL and the force majeure clause in Model International Sale Contract. It should be noted that the parties often need to adapt the content of this clause so as to take account of the particular circumstances of the individual contract. This paper contributes to help the parties to a contract to draft the meaningful "Force Majeure Clause" containing more precise and elaborate provisions.

• International Journal of Vascular Biomedical Engineering
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• 제1권1호
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• pp.13-23
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• 2003

Backgrounds: The present study in angulated coronary stenosis was to evaluate the influence of velocity and wall shear stress (WSS) on coronary atherosclerosis, the changes of hemodynamic indices following coronary stenting, as well as their effect of evolving in-stent restenosis using human in vivo hemodynamic parameters and computed simulation quantitatively and qualitatively. Methods: Initial and follow-up coronary angiographies in the patients with angulated coronary stenosis were performed (n=80). Optimal coronary stenting in angulated coronary stenosis had two models: < 50 % angle changed(model 1, n=43), > 50% angle changed group (model 2, n=37) according to percent change of vascular angle between pre- and post-intracoronary stenting. Flow-velocity wave obtained from in vivo intracoronary Doppler study data was used for in vitro numerical simulation. Spatial and temporal patterns of velocity vector and recirculation area were drawn throughout the selected segment of coronary models. WSS of pre/post-intracoronary stenting were calculated from three-dimensional computer simulation. Results: Follow-up coronary angiogram demonstrated significant difference in the percent of diameter stenosis between two groups (group 1: $40.3{\pm}30.2$ vs. group 2: $25.5{\pm}22.5%$, p<0.05). Negative WSS area on 3D simulation, which is consistent with re-circulation area of velocity vector, was noted on the inner wall of post-stenotic area before stenting. The negative WSS was disappeared after stenting. High spatial and temporal WSS before stenting fell into within physiologic WSS after stenting. This finding was prominent in Model 2 (p<0.01) Conclusions: The present study suggests that hemodynamic forces exerted by pulsatile coronary circulation termed as WSS might affect on the evolution of atherosclerosis within the angulated vascular curvature. Moreover, geometric change, such as angular difference between pre / post-intracoronary stenting might give proper information of optimal hemodynamic charateristics for vascular repair after stenting.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1997년도 추계학술강연 및 발표대회 강연 및 발표논문 초록집
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• pp.7-7
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• 1997

During sintering of very porous green bodies, as obtained by compaction of hard powders - such as tungsten carbide or ceramics - or by injection moulding, important shrinkage occurs. Due to heterogeneous green density field, gravity effects, friction on the support, thermal gradients, etc., this shrinkage is often non-uniform, which' may induce significant shape changes. As the ratio of compact dimension to powder size is very high, the mechanics of continuum is relevant to model such phenomena. Thus numerical techniques, such as the finite element method can be used to simulate the sintering process and predict the final shape of the sintered part. Such type of simulation has much been developed in the last decade firstly for hot isostatic pressing and next for die compaction. Finite element modelling has been recently applied to free sintering. The simulation of sintering should be based on constitutive equations describing the thermo-mechanical behaviour of the material under any state of stress and any temperature which may arise within the sintering body. These equations can be drawn either from experimental data or from micromechanical models. The experiments usually consist in free sintering and sinter-forging tests. Indeed applying more complex loading conditions at high temperature under controlled atmosphere is delicate. Micromechanical models describe the constitutive behaviour of aggregates of spheres from the deformation of two-sphere contact either by viscous flow or grain boundary diffusion. Such models are not able to describe complex microstructure and mechanisms as observed in real materials but they can give some basic information on the formulation of constitutive equations. Practically both experimental and theoretical approaches can be coupled to identify the constitutive equations. Such procedure has been performed for modelling the sintering of compacts obtained by die pressing of a mixture of tungsten carbide and cobalt powders. The constitutive behaviour of this material during sintering has been described by a linear viscous constitutive model, whose functions have been fitted from results of free sintering and sinter-forging experiments. This model has next been introduced in ABAQUS finite element code to simulate the sintering of heterogeneous green compacts of various geometries at constant temperature. Examples of simulations are shown and compared with experiments.

• 대한치과보철학회지
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• 제37권5호
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• pp.687-697
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• 1999

A finite element analysis has been utilized to analyze stress and strain fields and design a new configuration in orthopedics and implant dentistry. Load transfer and stress analysis at implant bone interface are important factors from treatment planning to long term success. Bone configuration and quality are different according te anatomy of expecting implantation site. The purpose of this study was to compare the stress distribution in maxilla and mandible accord-ing to implant length and bone engagement types. A three dimensional axi-symmetric implant model(Nobel Biocare, Gothenburg, Sweden) with surrounding cortical and cancellous bone were designed to analyze the effects of bone engagement and implant length on stress distribution. ANSYS 5.5 finite element program was utilized as an interpreting toot. Three cases of unicortical anchorage model with 7, 10, 13 mm length and four cases of bicortical anchorage model with 5, 7, 10 and 13 mm length were compared both maxillary and mandibular single implant situation. Within the limits of study, following conclusions were drawn. 1. There is a difference in stress distribution according to cortical and cancellous bone thickness and shape. 2. Maximum stress was shown at the top of cortical bone area regardless of bone engagement types. 3. Bicortical engagement showed less stress accumulation when compared to unicortical case overall. 4. Longer the implant future length, less the stress on cortical bone area, however there is no difference in mandibular bicortical engagement case.

• 초등상담연구
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• 제11권3호
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• pp.331-350
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• 2012

이 논문은 학교폭력을 예방하고 대처하기 위해서는 학교폭력의 원인에 대한 정확한 진단이 선행되어야 한다고 보고, 학교폭력을 유발하는 요인이 무엇인지 생태학적 관점에서 고찰하는데에 그 목적을 두었다. 이를 위해 Bronfenbrenner(1979)의 생태학적 발달이론의 영향을 많이 받은 Benbenishty와 Astor(2005)의 학교폭력 관련 요인들에 대한 생태학적 경로모형을 간단히 살펴보았고, 이 모형에 기초하여 학교폭력의 유발 요인으로 학교 요인, 개인 요인, 가정 요인, 지역사회 요인으로 구분하여 관련 문헌과 선행연구를 고찰하였다. 이러한 고찰을 통해 본 논문에서는 학교폭력은 한 가지 원인이 아닌 학교, 개인, 가정, 지역사회 관련 요인 등 여러 원인이 복합적으로 작용하여 발생하는 이른바 '폭력의 종합 세트'이기 때문에 이러한 요인들을 고려한 종합적 처방을 마련하여 장기적인 노력을 기울여야 한다는 점과 본 논문에서 고찰한 학교폭력의 유발 요인과 그 영향에 대한 성찰을 토대로 학교와 가정 및 사회를 바로 세워나갈 때 학교폭력의 대책이 진정성과 효과를 지니게 될 수 있다는 점을 강조하였다.

• 한국사회복지학
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• 제63권4호
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• pp.83-107
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• 2011

본 연구는 한국복지패널 1~4차년도 조사 자료를 활용하여 국민기초생활보장제도 수급탈출의 기간의존성을 분석하였다. 수급기간이 길어질수록 수급탈출률이 낮아지는 기간의존성의 존재는 복지의존을 시사하는 중요한 증거가 될 수 있다. 실증적 분석 결과, 성, 연령, 교육수준, 결혼지위, 건강상태, 취업 형태 등의 관찰된 특성을 통제한 후에도 수급기간이 길어질수록 수급탈출률이 낮아지는 현상이 관찰되지만, 관찰되지 않은 이질성을 통제하면 수급기간의 영향이 통계적으로 유의하지 않은 것으로 나타났다. 이러한 결과에 따르면, 수급기간이 길어질수록 수급탈출률이 낮아지는 현상의 상당부분은 수급자 집단의 이질성으로 인한 허위관계이고 수급탈출의 기간의존성은 크지 않은 것으로 판단된다.