• 한국산업보건학회지
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• 제31권4호
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• pp.353-366
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• 2021

Objectives: An appropriate level of cost support is being proposed to maximize the participation rate. In addition, as the amount of support is highly concentrated at the level of the limit under the current level of supports, the level of cost support is low when the actual level of cost of measuring the working environment exceeds the limit. This paper describes the adjustment of an appropriate cost support rate. Methods: First, this paper analyzes the current cost support status using data from the KOSHA. Second, an alternative for adjusting the cost support rate is presented in consideration of the incentive aspect. Third, we present simulation results for the average cost support rate, the impact of each alternative on finance, and more. Fourth, the most desirable adjustment method is presented after comparing and analyzing the results of various alternatives. Results: In this paper, we present a new scale model. This model is a mixture of flat-rate, fixed rate, and subside cap. It is expected that the new model will not only facilitate participation in businesses with low measurement costs, but also have the effect of controlling measurement costs for institutions that incur greater costs. It is also expected that setting a cap will have the effect of considering government finances and inducing excessively costly institutions to reduce costs. Thus, the new model is likely to be superior to others. If the fourth plan is applied to new businesses and the fifth plan is applied to sustainable businesses, the average cost support rates will be 87.68 percent and 65.18 percent, respectively, and the needed finances will be 2.5 billion won, 18.8 billion won, and 21.3 billion won in total. Conclusions: It seems most desirable to introduce a new model that combines flat-rate, fixed-rate, and subsidy cap systems and achieve an appropriate cost support rate through this model.

• 산업노동연구
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• 제17권1호
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• pp.269-295
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• 2011

본 논문은 파트타임근로를 통해서 짧은 시간 내에 높은 고용률 향상이라는 성과를 달성한 네델란드에서의 파트타임근로의 현황과 전망, 제도와 정책 등을 종합적으로 살펴보는 글이다. 네델란드는 파트타임근로를 통한 고용률 제고뿐만 아니라 양질의 파트타임을 만들어냈다는 점에서 주목받고 있다. 네델란드에서 파트타임근로가 증가한 것은 시장, 제도, 정책, 그리고 노사관계 등 다양한 요인들이 파트타임근로를 촉진하는 방향으로 서로 보완하면서 발전하였기 때문이다. 노동시장에서는 여성의 경제활동참가 증가와 기업의 파트타임수요의 증가라는 선순환 구조가 형성되었고, 파트타임근로를 보호하고 파트타임에 유리하도록 인센티브 구조를 재설계하며 근로시간선택권을 보장하며 보육시스템을 강화하는 제도나 정책이 지속적으로 강화되었다. 그러나 이러한 시장에서의 수요-공급의 선순환 구조와 파트타임을 촉진한 제도와 정책도 노사정 사이의 사회적 합의라는 커다란 틀 속에서 그에 기초해서 이루어진 것이었다는 점이 중요하다. 또한 거의 30년 가까지 지속된 네델란드모델은 노동시장의 문화와 관행으로 정착되어 풀타임근로나 노동시간 확대의 방향으로 전환하기는 어려운 것으로 평가된다. 따라서 네델란드 모델은 네델란드의 사회적 조건 하에서 성립한 특수한 모델이고 높은 수준의 사회적 합의를 기초로 하여 제도와 시장이 보완적으로 잘 결합되어 있는 모델이기 때문에 여타 국가가 부분적인 제도 이식을 통해서 성과를 내기는 어렵다고 판단된다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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• pp.501-504
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• 2006

The estimation of the work of heart can be treated as one of the most important parameters for determining the amount of circulating blood needed for harmonious metabolism in the human body. By monitoring the work of heart, one can detect increased work load of heart and start the treatment at the early stage of CHF. Thus it is necessary to estimate the work of heart. The contractility of the left ventricle, the second important parameter for representing the motion of heart, can be estimated through information on the work of heart. In this study, the modified Windkessel model, which has been used for a measure of vascular hemodynamic impedance parameters, was adapted to estimate the work of heart.

• 노동경제논집
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• 제35권3호
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• pp.83-100
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• 2012

본 연구는 2004년부터 점진적으로 실시된 주40시간 근무제, 이른바 '주5일 근무제'의 도입이 근로시간, 임금 및 고용에 미친 효과를 "고용형태별근로실태조사" 원자료를 이용하여 추정하였다. 법정 근로시간 단축이 연도별 산업별 및 사업체 규모별로 단계적으로 적용되었던 점에 착안하여 삼중차감 모형을 사용하였다. 희귀분석 결과, 주 40시간 근무제의 도입으로 실제 근로 시간은 약 43분 단축되었고, 시간당 임금은 약 6.6% 상승한 것으로 나타났으나 신규 고용은 약 2.3%포인트 하락시킨 것으로 나타났다.

• 한국정밀공학회지
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• 제20권6호
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• pp.37-46
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• 2003

This paper is to predict quality deterioration resulting from a caulking process of yoke which is a part of automotive steering system. The caluking is a plastic deformation process involving such as impact of high speed tool, contacts between part and fixtures and strain rate sensitivity of the part material. Elaborate application of finite element method is neccesary to calculate changes of part dimensions because they fall into a level of tolerances. Simple work hardening and strain rate sensitive model is proposed fur the material and applied for the simulation by using Abaqus which is able to cater for elastoplastic rate sensitive material and contacts. Numerical results of test models that represent tensile bar and tensile plate are compared with material data inputs. Dimensional changes for the yoke are calculated from simulations and compared to the mesurements and they show good agreement. The method presented here with the material model proved to be valuable to assess quality deterioration for similar metal forming processes.

• 한국건축시공학회지
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• 제21권2호
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• pp.105-112
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• 2021

국내 해체시장 규모는 꾸준히 증가되고 있는 반면, 해체공사비 예측 연구는 미흡한 실정이다. 이에 본 연구에서는 해체공사비 변동에 영향을 미치는 다양한 속성을 반영한 공사비 예측 모델을 제시하고자 하였다. 이를 위하여 기존 문헌고찰과 전문가 자문을 바탕으로 13개의 영향요인과 실적공사비 데이터를 수집하였으며, 회귀분석을 통해 2개의 예측모델을 구축하고 예측정확도를 평가하였다. 그 결과, 약 6~12%의 평균 오차율을 보였으며, 예측 모델로서의 활용 가능성을 모색할 수 있었다. 본 연구 결과는 향후 국내 해체공사의 적정 공사비산정 및 관련 기준 정비에 기여할 수 있을 것이다.

• 설비공학논문집
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• 제8권2호
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• pp.299-306
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• 1996

This work presents an analytical model, so called modified LMTD method, to predict the thermal performance of finned-tube heat exchanger under frosting conditions. In this model, the total heat transfer coefficient and effective thermal conductivity of the frost layer were defined as a function of frost surface temperature. The surface temperature of the frost layer formed on the heat exchanger was calculated through the analysis of the heat and mass transfer process in the air and frost layer. To examine the validity of this analytical model, the computed results from the present model, such as heat transfer rate, frost mass and thickness of frost, were compared with the ones of the expermental work and LMED method.

• Journal of Biosystems Engineering
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• 제16권2호
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• pp.159-166
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• 1991

A simulation model was developed for analyzing a crop transport system using SLAMSYSTEM. The developed model could predict total delivered amount and delivery rate of a crop under various conditions of transport and analyze the effects of work factors on the efficiency of the crop transport system. A simulation model was also developed to analyze a rice transport system based on the generalized model of the crop transport system.

• Biomaterials and Biomechanics in Bioengineering
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• 제5권1호
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• pp.51-64
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• 2020

In this study, the mathematical model that describes blood cell development in the bone marrow (i.e., hematopoiesis) has been studied via the Homotopy Perturbation Method (HPM). The results from the present work compared very well with the numerical solutions from published literature. This work has shown that the HPM is viable for solving delay differential equations born from hematopoiesis problem. The influence of the proliferating cells loss rate, time delay rate and the phase re-entry rate on the population densities of both the proliferating and resting cells were also determined through the underlined procedure.

• ETRI Journal
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• 제43권4호
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• pp.758-768
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• 2021

In this work, the secrecy of a typical wireless cooperative dual-hop non-orthogonal multiple access (NOMA)-enabled decode-and-forward (DF) relay network is investigated with the impact of collaborative and non-collaborative eavesdropping. The system model consists of a source that broadcasts the multiplexed signal to two NOMA users via a DF relay, and information security against the eavesdropper nodes is provided by a helpful jammer. The performance metric is secrecy rate and ergodic secrecy capacity is approximated analytically. In addition, a differential evolution algorithm-based power allocation scheme is proposed to find the optimal power allocation factors for relay, jammer, and NOMA users by employing different jamming schemes. Furthermore, the secrecy rate analysis is validated at the NOMA users by adopting different jamming schemes such as without jamming (WJ) or conventional relaying, jamming (J), and with control jamming (CJ). Simulation results demonstrate the superiority of CJ over the J and WJ schemes. Finally, the proposed power allocation outperforms the fixed power allocation under all conditions considered in this work.