• Journal of Forest and Environmental Science
• /
• 제33권2호
• /
• pp.130-135
• /
• 2017

In temperate monsoon regions, extensive shallow landslides triggered by heavy rainfall are recurrent phenomena in mountainous areas. 1,357 landslides over Jinbu area, Korea that totaled 127 km2 were identified from aerial photographs and field survey. We examined characteristics of rainfall-induced shallow landslides and casual factors affecting landslide distribution with respect to topographic and forest settings, and land use. Most landslides occurred in the study area were the results of a complex combination of precondition, preparatory factors and triggering factors. Cumulative rainfall and high intensity rainfall during short period of time made the study area very sensitive to landslides and played as catalysts to enable other factors including topographic and forest settings, and land use to act more effectively. In addition, some landslides at lower elevation involved channel incision or bank erosion influenced by land use changes such as deforestation and intensification of agriculture surrounding riparian forests or hillslopes. The results suggest that most of landslide were triggered by heavy rainstorms while topographic, forest settings, and land use affected landslide distribution occurred in the study area.

• Nuclear Engineering and Technology
• /
• 제52권2호
• /
• pp.258-270
• /
• 2020

A new task of using the Jacobian-Free-Newton-Krylov (JFNK) method for the PWR core transient simulations involving neutronics, thermal hydraulics and mechanics is conducted. For the transient scenario of PWR, normally the Picard iteration of the coupled coarse-mesh nodal equations and parallel channel TH equations is performed to get the transient solution. In order to solve the coupled equations faster and more stable, the Newton Krylov (NK) method based on the explicit matrix was studied. However, the NK method is hard to be extended to the cases with more physics phenomenon coupled, thus the JFNK based iteration scheme is developed for the nodal method and parallel-channel TH method. The local gap conductance is sensitive to the gap width and will influence the temperature distribution in the fuel rod significantly. To further consider the local gap conductance during the transient scenario, a 1D mechanics model is coupled into the JFNK scheme to account for the fuel thermal expansion effect. To improve the efficiency, the physics-based precondition and scaling technique are developed for the JFNK iteration. Numerical tests show good convergence behavior of the iterations and demonstrate the influence of the fuel thermal expansion effect during the rod ejection problems.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2008년도 추계학술대회A
• /
• pp.1533-1538
• /
• 2008

The development of new material systems like Carbon Fiber Reinforced Polymer (CFRP) places ever higher demands on the techniques for non-destructive material characterisation. Image-producing eddy current methods also need to satisfy these demands. Eddy-current imaging of FRP is based on the anisotropic electrical properties of the material investigated. Significant differences in conductivity between carbon fibres, polymer matrix and integrated functional components can be found. The availability of high-resolution sensors enables access to the local distribution of the electromagnetic properties. The static and dynamic procedures for isolating influential characteristics, already in use in eddy-current technology, can now be supplemented by topographical images. The precondition for a successful implementation of the eddy-current procedure is a deeper understanding of the image-generating process which allows correct interpretation of the images obtained.

• Geomechanics and Engineering
• /
• 제20권5호
• /
• pp.411-420
• /
• 2020

Numbers fitting-curve equations have been proposed to predict soil-water retention curve (SWRC) whose parameters have no definitude physical meaning. And these methods with precondition of measuring SWRC data is time-consuming. A simplified directly method to estimate SWRC without parameters obtained by fitting-curve is proposed. Firstly, the total SWRC can be discretized into linear segments respectively. Every segment can be represented by linear formulation and every turning point can be determined by the pore-size distribution (PSD) of Mercury Intrusion Porosimetry (MIP) tests. The pore diameters governing the air-entry condition (AEC) and residual condition (RC) can be determined by the PSDs of MIP test. The PSD changes significantly during drying in SWR test, so the determination of AEC and RC should use the PSD under corresponding suction conditions. Every parameter in proposed equations can be determined directly by PSD without curve-fitting procedure and has definitude physical meaning. The proposed equations give a good estimation of both unimodal and bimodal SWRCs.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
• /
• 제15권6호
• /
• pp.450-453
• /
• 2009

3D 가상공간이 협업을 지원하기 위해서는 관계자들 간에 직접적으로 의사를 표현할 수 있는 기술을 필요로 한다. 이때 의사표현으로 사용되는 Annotation은 내용표현이 쉽고, 빠를 뿐만 아니라 다양한 형태의 면에 대해서도 의미의 내용이 정확히 전달될 수 있도록 입력 가능해야 하고, 나아가 3차원의 의미를 지니는 내용에 대해서도 다양한 각도에서 이를 인식할 수 있도록 표현되어야 한다. 이 논문에서는 다양한 형태의 면에서도 입력이 가능한 Sketch-Box를 이용한 Sketch Annotation 기법을 제안하고 있으며, 이 Sketch-Box는 3D Annotation으로서 3차원의 의미를 지니는 내용도 효과적으로 전달할 수 있다.

• 무역상무연구
• /
• 제78권
• /
• pp.31-51
• /
• 2018

As International arbitration has increased in popularity, there has been an expansion in the pool of arbitrators, and a commensurate diversification of not only the legal backgrounds but cultural backgrounds among themand among parties. As a result, there has been increased attention on the standards used to evaluate arbitrators' conduct and ethics, especially among them, 'Impartiality and Independence of Arbitrator' which is a precondition for an acceptable awards. There is no international treaty or code governing these issues. But the International Bar Association(IBA) seems to be leading the way such as establishing practical guidelines regarding to impartiality and independence of arbitrator. This article will review some theories, cases about impartiality and independence of arbitrator, and practical standards through the IBA guidelines. It is intended to provide specific guidance and criteria to the arbitrators, parties and counsels. And also it is expected to prevent unnecessary delays in arbitration proceedings in advance and filing for the annulment of arbitral awards because of lack of impartiality and independence of arbitrator as well.

• 대한예방한의학회지
• /
• 제13권1호
• /
• pp.1-11
• /
• 2009

To strengthen the R&D capability and the competitiveness of the Korean oriental medicine industry, an adequate supply of qualified R&D personnel including medical doctors of Korean oriental medicine is an important precondition. This study analyze current and future R&D manpower requirements including medical doctors in the Korean oriental medicine research area. Our analyses can be utilized for developing the government R&D manpower planning including the adequate supply of medical doctors for the Korean oriental medicine research. For the study, we conducted and analyzed a delphi survey of the experts, the principal investigators, with expertise in Korean oriental medicine research areas. The results of this study can be summarized as follows; First, in 2007 the Korean oriental medicine R&D personnel is currently under-supplied as many as 302 people including 111 medical doctors of Korean oriental medicine. The rate of under-supplied is 28.2%. Second, in 2017 the forecast shows that the R&D personnel in this area will be more severely under-supplied as many as 539 people including 185 medical doctor of Korean oriental medicine. The rate of under-supplied will be 32.6%. As a result, the confrontation of demand and supply forecasts shows that, in general, severe shortages of R&D manpower in the areas of Korean oriental medicine will result if there are not adequate manpower policy adjustment.

• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2007년도 춘계학술대회
• /
• pp.114-121
• /
• 2007

In the existing ISP methods, the important' role of enterprise value is usually ignored or not recognized in the information systems planning (ISP). Besides, in some ISP methods, there is a connotative precondition that the main body of value is always the enterprise stakeholder. Thus, in ISP, the enterprise stakeholders‘ value has been recognized while the value of other main bodies has been neglected, which has resulted in boycott and other problems in normalization construction. Based on the existing ISP analysis frame and ways, this article analyzes the enterprise fundamental principle of enterprise value acting on ISP and defines the formation of enterprise value. On the basis of Keeney's analysis way of value focused thinking for decision-making, we induct the factors of enterprise value into the ISP method and set forth such an ISP process: (1) identify the aggregation of enterprise value; (2) conform the objective structure of enterprise levels; (3) determine the appraisal standard for enterprise fundamental objectives; (4) determine the basic structure for information systems ; (5) confirm the data requirements for information systems; (6) give appraisal and comment.

• 한국학교ㆍ지역보건교육학회지
• /
• 제11권2호
• /
• pp.115-127
• /
• 2010

Objectives: This study was carried out to investigate the effects of improvement in health promotion behavior of nursing college students by the difference of self esteem. The students was divided two groups one is low level self esteem the other is high depending on median point of self esteem. The specific objectives were first, to find out the differences of health promotion behavior, self efficacy, health perception, fatigue level, depression, psychosocial wellbeing, second, to establish which factors determine their health promotion behavior between two groups. Methods: Self-administered questionnaires were given to 262 students enrolled in a nursing college. between may and June 2008. The questionnaire items included age, sex, education level, self esteem, self efficacy, health perception, fatigue, depression,, psychosocial well being and health promotion behavior. For statistical analysis, frequency, t-test, regression used for determining the factors effecting health promotion behavior. Results: The influencing factors were self efficacy among low level and self efficacy, fatigue and stress among high level. Self efficacy strong positive impact on health promotion behavior among both groups. Stress and fatigue was only effective among high level group. Conclusion: Based on the study results, improvement of health promotion behavior among nursing students requires the development and application of programs to manage self efficacy and stress as a precondition for depending on self esteem level.

• 생물환경조절학회지
• /
• 제15권1호
• /
• pp.100-106
• /
• 2006

A hypertonic solution of sorbitol was used to precondition Douglas-fir and Western hemlock plug seedlings to improve desiccation resistance. Seedlings were preconditioned by soaking their root balls in water, -0.75 or -1.50 MPa sorbitol solution for 22 hr, and then exposed to desiccation conditions for 8 days. During the desiccation period, a transpirational water loss was significantly reduced by the sorbitol preconditioning, with its effect positively depending on concentration. This preconditioning-induced reduction in water loss was mainly caused by the decline in needle stomatal conductance. Sorbitol-induced stomatal control was more closely associated with reduction in plant water potential, rather than increase in abscisic acid concentrations. After rehydration of stressed-plants, most of the preconditioned seedlings with sorbitol were survived, while only 35% of Douglas-fir and 28% of Western hemlock seedlings treated with water were alive. The post-growth was significantly greater in the preconditioned seedlings than only water-treated seedlings. These results suggested that the earlier stomatal control with sorbitol-facilitated preconditioning could play a role in improving desiccation resistance of evergreen woody plants at transplanting in the field where water supply is limited or dry conditions are prevailing.