• 한국직업건강간호학회지
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• 제9권2호
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• pp.121-131
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• 2000

This study was conducted to acquire data in order to institute an effective industrial accident compensation insurance(IACI) system. The subjects were employers and employees in small scale industries which have less than 5 employees. The questionnaires consisted of questions on perception and need for IACI. A total of cases were 181 employers and 105 employees participated in the study. Perception and need of employers and employees were assessed using the ANOVA, t-test. The results were as follows ; 1. Workplaces examined mostly in manufacturing(78.9%), industries with one employee(44.1%). Beneficiary rate of IACI 4.4%. 2. 60.0% of employees had experienced an industrial accident and in most cases employers paid the cost of medical treatment. 45.0% of employers nd 50.0% of employees were not aware that IACI had been put into effect starting July, 1, 2000. 52.0% of employers had no type of industrial accident compensation. 3. The need of outcome measures, especially of employers and employees who had an IACE, were higher than those without an IACI. Employers and employees who had experienced an industrial accident outnumbered those who hadn't. The results of this study reveal that there is a great need for the institution of an IACI and health promotion policy in small scale industries.

• 한국지구과학회지
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• 제34권1호
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• pp.51-58
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• 2013

대기 모델링 연구에서 시간 간격을 적절하게 결정하는 것은 중요한 문제이다. 본 연구에서는 비선형 대기 모형에서 수치 해의 시간 간격에 대한 민감도를 조사하였다. 이를 위해 간단한 무차원화된 역학 모형을 사용하여 시간 간격과 비선형성 인자를 바꾸어가며 수치 실험을 수행하였다. 실험 결과, 비선형성 인자가 영향을 줄 만큼 크지 않고 절단 오차를 무시할 수 있는 경우에는 수치 해가 시간 간격에 민감하지 않았다. 그러나 비선형성 인자가 큰 경우에는 수치 해가 시간 간격에 민감한 것으로 밝혀졌다. 이 경우, 시간 간격이 감소할수록 공간 필터의 강도가 증가하여 작은 규모의 현상이 약하게 모의되었다. 이는 일반적으로 시간 간격이 감소하면 절단 오차가 감소하여 더 정확한 수치 해가 도출된다는 사실과 상충한다. 이러한 충돌은 비선형 모형의 수치 해를 안정하게 하기 위해 공간 필터가 반드시 필요하기 때문에 피할 수 없다.

• 전기전자학회논문지
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• 제17권3호
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• pp.294-300
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• 2013

식품 유통단계에서 농산물의 안전성 확보는 매우 중요하기 때문에, 모든 나라가 이를 위해 다각적인 노력을 기울이고 있다. 최근, 온라인 쇼핑몰을 통한 농산물 판매 시장 규모가 크게 증가함에 따라, 판매되는 농산물의 이력 정보를 소비자에게 정확하고 편리하게 제공할 수 있는 방안이 다양하게 연구되고 있다. 본 논문은 농산물에 대한 통합 자가 홍보 시스템을 설계하고 구현한다. 제안하는 시스템을 통해 생산자는 자신의 생산자 정보와 함께 자신이 생산한 농산물의 이력정보를 직접 제공함으로써, 농산물 이력정보의 안전성을 높일 수 있으며, 소비자는 검증된 생산자로부터 구매한 농산물에 대한 품질의 신뢰성을 확보할 수 있다. 특히, 제안하는 시스템은 홍보를 위한 큰 비용이나 복잡한 절차가 필요하지 않기 때문에, 소규모 농민들에게 편리한 홍보 수단으로 사용될 수 있으며 판매수익 증대에 도움을 줄 수 있다.

• Wind and Structures
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• 제17권6호
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• pp.647-670
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• 2013

The paper presents a numerical approach to study of fluid flow characteristics and to predict performance of wind turbines. The numerical model is based on Finite-volume method (FVM) discretization of unsteady Reynolds-averaged Navier-Stokes (URANS) equations. The movement of turbine blades is modeled using moving mesh technique. The turbulence is modeled using commonly used turbulence models: Renormalization Group (RNG) k-${\varepsilon}$ turbulence model and the standard k-${\varepsilon}$ and k-${\omega}$ turbulence models. The model is validated with the experimental data over a large range of tip-speed to wind ratio (TSR) and blade pitch angles. In order to demonstrate the use of numerical method as a tool for designing wind turbines, two dimensional (2-D) and three-dimensional (3-D) simulations are carried out to study the flow through a small scale Darrieus type H-rotor Vertical Axis Wind Turbine (VAWT). The flows predictions are used to determine the performance of the turbine. The turbine consists of 3-symmetrical NACA0022 blades. A number of simulations are performed for a range of approaching angles and wind speeds. This numerical study highlights the concerns with the self-starting capabilities of the present VAWT turbine. However results also indicate that self-starting capabilities of the turbine can be increased when the mounted angle of attack of the blades is increased. The 2-D simulations using the presented model can successfully be used at preliminary stage of turbine design to compare performance of the turbine for different design and operating parameters, whereas 3-D studies are preferred for the final design.

• Journal of the korean society of oceanography
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• 제32권3호
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• pp.93-102
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• 1997

Coastal circulations during the (surface condition of an) idealized cold-air outbreak are numerically investigated with two-dimensional, non-hydrostatic model in which a constant bottom-slope exists. The atmospheric forcing during a cold-air outbreak is incorporated as the surface cooling and the wind stress. When the offshore angle of the wind-stress vector, defined as the angle measured from the alongshore axis, is smaller than 45 degrees, a strong downwelling circulation develops near the coast. A sharp density front, which separates the vertically homogeneous region from the offshore stratified region, is formed near the coast and propagates offshore with time. Onshore side of the density front, small-scale circulation cells which are aligned in the direction perpendicular to the bottom begin to develop as the near-coast homogeneous region broadens. The surface cooling enhances greatly the development of the surface mixed layer by convective motions due to hydrostatic instability. The convective motions reach far below the hydrostatically unstable layer which is attached to the surface. The small-scale circulation cells are appreciably modified by the convetion cell and the density front develops far offshore compared to the case of no surface cooling. As to the effect of the bottom slope, the offshore distance of the density front increases (decreases) as the bottom slope decreases (increases), which results from the fact that the onshore volume-transport (Ekman transport) of the low-density upper seawater remains almost constant when the wind-stress is maintained constant. It is shown that the bottom slope is an essential factor for the formation of both the density front and the alongshore current when the surface cooling is the only forcing.

• 농촌계획
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• 제22권2호
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• pp.153-164
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• 2016

Developed countries in agriculture like Netherlands, Belgium and England, have managed Green Care policy and project during the last decades. The needs in Green Care is also increasing as new growth power in rural area of Korea. This study investigated sites which are already operating as complex with Green Care theme. This study surveyed the operating conditions like type, scale, location pattern, purpose, customer and finance for cases of the complex. The period of the survey is from 2015. 8. 11 to 2015. 09. 10 for the 24 activated cases in aspect of operation and management. Among the 24 cases, 16 cases were classified as Green Care Complex which facilities are aggregated a place, and the other 8 cases as Green Care Cluster which are distributed at several places. The analysis result showed that there were apparent distinction among cases in total budget, costs of construction, capacity for guest, and the total number of annual visitors. Despite of the type and scale the accommodation cost, the number of workers, and amount of sales have small deviation in distribution of values, although the cases have various type of contents and scale of space. The result of this study can be used as data of bench marking to develop the Green Care Complex or Cluster in rural area.

• 대한지구과학교육학회지
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• 제12권1호
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• pp.109-118
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• 2019

이 연구의 목적은 소규모학교 과학실험 보조교사로 참여한 경험이 초등 예비교사의 과학 수업 불안과 과학 교수 효능감에 미치는 효과를 알아보고자 하는 것이다. 이를 위하여 초등 예비교사 21명을 선정한 후 약 10개월 동안 초등학교에서 과학실험 보조교사 업무를 수행하도록 하였다. 그리고 예비교사들에게 과학실험 보조 교사로 참여하기 전과 보조교사가 끝난 후에 과학 수업 불안과 과학 교수 효능감을 알아보는 검사를 실시하였고, 검사 결과를 분석한 후 일부 예비교사는 면담을 실시하였다. 연구 결과를 살펴보면, 소규모학교 과학실험 보조교사 경험은 초등 예비교사들의 과학 수업 불안도와 그 하위 요소인 과학 수업 상태 불안도 및 과학 수업 특성 불안도 모두를 감소시키는데 효과가 있었다. 또한 과학 교수 효능감과 그 하위 요소인 과학 교수 자기 효능감에서는 효과가 있었으나, 과학 교수 결과기대감에서는 효과가 나타나지 않았다. 과학실험 보조교사 경험은 예비교사의 개인적인 경험 및 인식에 따라 그 효과가 다르게 나타났다.

• The Journal of Asian Finance, Economics and Business
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• 제6권3호
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• pp.327-337
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• 2019

The aim of this research is to contribute to enhancing the competitiveness of automotive parts suppliers while departing from the dependent relationship structure, by developing and interpreting factors that affect sale, which are financial achievements, in a practical way. The research data covered 200 companies from 2013-2017. The study hypothesis was verified by dividing the hypothesis into Model1 with control variables only and Model2 with control variables in independent variables. As a result of hypothesis testing, regarding sales, only capital size showed to have an effect in Model1, while in Model2, asset size, number of employees and joint ventures with foreign companies did but the other remaining factors did not. In particular, the results showed that an increase in financial performance required 'Economies of scale', and that companies that concentrated on a small number of items, diversified products into four or more items, or owned two to four suppliers, reaped positive results in financial performance. Therefore, in addition to the selection and concentration of corporate management for production items and account management, applying strategies, like the inter-company M&A, consortiums and co-branded strategies to achieve 'Economy of scale', would highly enhance the financial performance of automotive parts suppliers.

• 한국자동차공학회논문집
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• 제14권6호
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• pp.127-136
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• 2006

Prediction of diesel particulate filtration is typically made by virtue of modeling of particulate matter(PM) collection. The model is closed with filtration parameters reflecting all small scale phenomena associated with PM trapping, and these parameters are to be traced back by inversely analyzing large-scale empirical data-the pressure drop histories. Included are soot cake permeability, soot cake density, soot density in the porous filter wall, and percolation constant. In the present study, a series of single channel DPF experiment is conducted, pressure histories are inversely analyzed, and the essential filtration parameters are deducted by DPF filtration model formulated with non-linear description of soot cake regression. Sensitivity analyses of model parameters are also made. Results showed that filtration transients are significantly altered by the extent of percolation constant, and the soot density in the porous filter wall is controlling the filtration qualities in deep-bed filtration regime. In addition, effect of soot particle size on filtration quality is distinct in a period of soot cake regime.

• Wind and Structures
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• 제5권2_3_4호
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• pp.115-126
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• 2002

A mesoscale meteorological model is applied to simulate turbulent airflow and eddy shedding over the Isle of Arran, SW Scotland, UK. Under conditions of NW flow, the mountain ridge of Kintyre, located upwind of Arran, induces gravity waves that also affect the airflow over the island. The possibility to nest domains allows description of the airflow over Arran with a very high resolution grid, while also including the effects of the surrounding mainland of Scotland, in particular of the mountain ridge of Kintyre. Initialised with a stably stratified NW flow, the mesoscale model simulates quasi-stationary gravity waves over the island induced by Kintyre. Embedded in the larger scale wave trains there is continuous development of small-scale transient eddies, created at the Arran hill tops, that move downstream through the stationary wave field. Although the transient eddies are more frequently simulated on the northern island where the terrain is more pronounced, they are also produced over Tighvein, a hill of 458 m on the southern island where measurements of surface pressure and 2 m meteorological variables have been recorded at intermittent intervals between 1996 and 2000. Comparison between early observations and simulations so far show qualitatively good agreement. Overall the computations demonstrate that turbulent flow can be modelled with a horizontal resolution of 70 m, and describe turbulent eddy structure on wavelength of only a few hundred metres.