• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.11a
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• pp.111-112
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• 2012

Korean government is planning to supply a half million public and permanent rental houses from 2013 to 2018 for settlement of non-homeowners. It is requested an objective criterion to appropriate the budget for the rental houses construction project cost. In this study, construction cost indices, which reflect the inflation trend of construction resources, were explorated to suggest a effective methodology for the construction cost estimation of therental houses. We figured out the future construction cost indices using several scientific methods, and seven estimated indices values were shown. It is required an additional research to select the proper value among the analyzed indices.

• Journal of applied mathematics & informatics
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• v.38 no.1_2
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• pp.13-36
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• 2020

In this paper, we have presented a multispecies prey-predator harvesting system based on Lotka-Voltera model with two competing species which are affected not only by harvesting but also by the presence of a predator, the third species. We also assume that the two competing fish species releases a toxic substance to each other. We derive the condition for global stability of the system using a suitable Lyapunov function. The possibility of existence of bionomic equilibrium is considered. The optimal harvest policy is studied and the solution is derived under imprecise inflation in fuzzy environment using Pontryagin's maximal principle. Finally some numerical examples are discussed to illustrate the model.

• Journal of the KSME
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• v.20 no.1
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• pp.8-13
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• 1980

Enegy 위기의 근본이유는 현재 이용되고 있는 Energy의 근원이 재생 불가능한 연료이기 때문 이다. 그래서 Energy 자원이 고갈됨에 따라 생산가는 점점 높아지고 이러한 자원에 계속 의존 하게 되면 가격은 끝없이 상승되게 된다. 이러한 과정은 강력한 Inflation 을 유발시키고 생활비의 부담을 낳게되며(특히 하류층에) 자본의 유용성을 감소시키게 된다. 이러한 압력하에서는 어떠한 경제구조도 견디어 낼 수 없음이 분명 하므로 이 Energy 위기는 가까운 시일안에 해결되어야 한다. 이 해결책은 단지 Oil, 천연Gas, 석탄, Uranium등의 재생불가능 연료를 가격적으로 안정 될 수 있는 재생가능성의 연료로 대체하는 것 뿐이다. 이 방법의 사용이 지연되어 상황이 나빠지지 않도록 하는 정책이 필요하며 이 정책의 실재적으로 중요한 문제점은 어떠한 정책과도 마찬가 지로 그 정책이 불능한가와 가능하다면 어떻게 해야 하는가 즉 방법이란 것으로 귀결된다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.1395-1400
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• 2007

Tire flat spot is a deformation which occurs around the contact patch during long-period parking and does hardly recovered even after driving. The deformation makes a tire self-excited and ride comfort gets worse. In this study, it is shown that the flat spot can be evaluated by measuring change in radial run out or force. Its effects on vibration at vehicle floor and steering wheel are also revealed. Finally it is shown that the flat spot is likely to occur if the inflation pressure is low and the tire is suppressed by a heavy load at a high temperature.

• Journal of the Korean Statistical Society
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• v.28 no.3
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• pp.311-324
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• 1999

The problem of 'outliers', observations which look suspicious in some way, has long been one of the most concern in the statistical structure to experimenters and data analysts. We propose a model for an outlier problem and also analyze it in linear regression model using a Bayesian approach. Then we use the mean-shift model and SSVS(George and McCulloch, 1993)'s idea which is based on the data augmentation method. The advantage of proposed method is to find a subset of data which is most suspicious in the given model by the posterior probability. The MCMC method(Gibbs sampler) can be used to overcome the complicated Bayesian computation. Finally, a proposed method is applied to a simulated data and a real data.

• IE interfaces
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• v.12 no.3
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• pp.414-423
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• 1999

A nuclear power plant requires a huge amount of initial investment and long construction lead time. As we expect that there may exist a relationship between investment and construction lead time, a number of researchers have reported that nearly a half of investments is incurred due to time factors such as the time value of money and inflation or escalation rates. Therefore, we investigated in this paper a relationship between the initial investment and the construction lead time of a nuclear power plant construction, and proposed a method for a trade-off analysis between the annual equivalent worth and the investment alternatives to reduce the construction lead time. Finally, we presented a real case to numerically explain the steps of the method presented in this paper.

• Journal of the KSME
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• v.20 no.2
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• pp.131-133
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• 1980

생산이나 제작공정에서 작업자를 필요로 하지 않는 자동화에 대한 관심은 주로 인플레이션 (Inflation), 피고용자에 대한 국가의 가종규제및 급속한 임금의 상승과 같은 경제적인 측면에 서의 입력으로부터 시작되었으며 이때는 주로 전기-기계(Electromechanical) 리레이를 사용한 기계적인 조작, 제품의 이송, 조립 및 조절등을 자동화는 정도에 지나지 않았다. 이후-간단한 공정뿐만 아니라 복잡한 공정에서의 자동화의 필요성과 각종산업분야에 있어서의 자동화의 경 향으로 요동화자체가 복잡성을 띰에 따라 자동화 자체에 대한 효과적인 운영과 적절한 통제방 법의 출현을 필요로 하게 되었다. 예로서 각종 수치제어공작기계의 출현과 사용으로 이들을 적 절한 방법으로 관할하고 조정하기 위해서 자동화에 대한 컴퓨터의 응용문제가 일기 시작했다. 또한 급속한 컴퓨터 산업과 기술의 발달과 플랙시블 소프트웨어(Flexible Software)의 개발이 컴퓨터의 자동화 응용에 큰 역할을 하게 되었다. 특히 우주, 항공산업과 기술의 발달과정에서 컴퓨터를 산업분야에 응용함으로서 이를 바탕으로 늘래 수년간 컴퓨터의 자동화 응용에 관한 분야의 연구가 활발히 진행되었다. 더욱이 요즘과 같이 에너지 부족시대에 있어서 자칫하면 에 너지의 한비를 수반할 수도 있는 자동화를 효과적으로 통제할 수 있는 능력을 갖춘 컴퓨터 사 용을 필요로 하고 있다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.373-376
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• 2000

We investigate some properties of commonly used residual plots in linear regression and provide some systematic insight into the relationships among the plots. We discuss three issues of linear regression in this stream of context. First of all, we introduce two graphical comparison methods to display the variance inflation factor. Secondly, we show that the role of a suppressor variable in linear regression can be checked graphically. Finally, we show that several other types of standardized regression coefficients, besides the ordinary one, can be obtained in residual plots and the correlation coefficients of one of these residual plots can be used in ranking the relative importance of variables.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.3
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• pp.177-183
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• 2004

The out-of-positioned small female drivers are most likely to be injured during airbag deployment due to their stature and proximity to the steering wheel and airbag module. In order to investigate the injury mechanisms, some experimental studies with Hybrid III 5% female dummy and with female cadavers could be found from the open literatures. However, the given information from those experimental studies is quite limited to the standard conditions and might not be enough to estimate the airbag inflation aggressiveness regarding on the occupant responses and injury. In this study, a finite element analysis has been performed in order to investigate the airbag-induced injuries. A finite element 5% female human model in anatomical details has been developed. The validation results of the model are also introduced in this paper.

• Journal of Biosystems Engineering
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• v.18 no.3
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• pp.220-229
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• 1993

A dimensional analysis was carried out to investigate if model agricultural radial tire can predict the tractive performance of prototype tires. Experimental data was analyzed to prove the results of dimensional analysis. The results was summerized as follows ; 1. When the model and prototype tires are tested under the same soil conditions, inflation pressure, slip and dynamic load, traction coefficient ratio between two tires depend on the geometry of two tires. 2. According to the regression analysis of the experimental data, traction equation parameters of the prototype tires can be predicted from the that of model tire 3. Predicted traction coefficient of prototype tire, calculated from the traction equation paramters, showed good correlation with that of experimental results. Thus it was possible to predict net and gross traction of prototype tire from the model traction equation parameters.