• 산업경영시스템학회지
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• 제21권45호
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• pp.247-251
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• 1998

From the early 90's TPM(Total Productive Maintenance) plays important roles to improve productivity and quality to keep enterprise's competivity. This study presents the results of an enquiry for the maintenance management of Korean industry in 1996. The response rate was 35.8% (43 companies) that the corporations were divided into four industrial groups, heavy process, light process, heavy assembly and light assembly. 40 question were asked, including maintenance organization, maintenance personnel, maintenance cost, measurement of maintenance performance and improvements achieved. This paper compares the results with those of an earlier Japanese and British enquiry.

• 한국경영과학회지
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• 제20권1호
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• pp.85-99
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• 1995

Increasingly, risk analysis is becoming important ingredients in achieving the successful implementation and application in the area of the project management. The project management system is designed to manage or control the project resources on a given activity within time, cost and performance so called TPPM (Total Productive Project Management). In this research, a risk analysis model misproposed to identify potential problem areas, quantify the risks, and generated the chice of the action that can be taken to reduce the risk. In addition two analysis models are proposed : 1) risk factor model and 2) network simulation model using VERT (Venture Evaluation and Review Technique ). The objective of the remodels is to estimate the schedule, cost performance risks. These proposed quantitative models for project risk analysis are proving its value for the project managers who need to assess the risk of changes in cost, schedule, or performance. The proposed models will be used in the area of project selection, evaluation and the allocation of project resources.

• Earthquakes and Structures
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• 제20권2호
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• pp.225-238
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• 2021

Supplemental passive dampers are widely employed to improve the structural performance of buildings under seismic excitations. Nevertheless, the added damping could be counter-productive if the axial forces induced by the damper reaction forces are not routed properly in the columns. A few researchers engaged to optimize the width-wise damper arrangement to improve the delivered path of the axial column forces. However, most of these studies are limited under the design-based seismic level and few of them has evaluated the collapse performance of buildings under strong earthquakes. In this paper, the strategic width-wise placement method of viscous dampers is explored regarding the building performance under collapse state. Two realistic steel buildings with different storeys are modelled and compared to explore higher mode effects. Each building is designed with four different damper arrangement scenarios based on a classic damper distribution method. Both a far-fault and a near-fault seismic environment are considered for the buildings. Incremental Dynamic Analysis (IDA) is performed to evaluate the probability of collapse and the plastic mechanism of the retrofitted steel buildings.

• 산경연구논집
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• 제5권2호
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• pp.13-20
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• 2014

Purpose - The purpose of this study is to empirically investigate the impact of capital structure on firm performance. Research design, data, and methodology - This study examined the impact of capital structure on the performance of cement companies listed on the Karachi Stock Exchange during the period 2009-2013. The authors hypothesize that there is a negative relationship between capital structure and firm performance. To examine the association, the authors run a Pearson correlation and multiple regression analysis. Results - Results reveal a strong negative relationship between debt to asset and firm performance variables (GPM, NPM, ROA, and ROE). Further, there is a positive relationship between debt to equity and firm performance variables (GPM and NPM), anda negative relationship between debt to equity and firm performance variables (ROA and ROE). Moreover, capital structure variables significantly impact firm performance. Conclusions - This study concluded that financial analysts and managers should emphasize on the optimal level of capital structure and efficient utilization and allocation of resources to achieve the targeted level of productive efficiency in business.

• 경영과정보연구
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• 제39권2호
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• pp.1-15
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• 2020

많은 기업들은 정보통신기술(ICT)을 이용하여 생산성을 향상시키고 있다. 이러한 정보통신기술의 사용은 자원기반 관점에서 주장하는 불확실한 환경에 대응한 기업의 경쟁우위를 창출하기 위한 하나의 과정으로 이해된다. 그러나 새로운 정보통신기술의 도입이 항상 업무 효율과 생산성 향상을 만들어내 것은 아니라, 오히려 새로운 정보통신기술의 도입이 기업 성과를 저해하는 요인으로 작용하는 경우도 있다. 테크노스트레스는 새로운 기술환경에 사용자가 적응하지 못할 때 사용자가 받게 되는 부작용을 의미한다. 즉, 새로운 정보통신기술의 이용에서 나타나는 부적 영향이 테크노스트레스라 할 수 있다. 이에 본 연구는 기업의 조직 구성원의 테크노스트레스가 반생산성에 미치는 영향을 규명하였다. 본 연구는 기존의 연구와는 달리, 대구지역 기업의 종사자들을 대상으로 연구를 수행하였으며, 혁신저항과 반생산적 과업행동을 종속변수로 활용하였다. 실증분석의 결과는 테크노스트레스가 반생산적 과업행동과 혁신저항을 증가시키고 있음을 나타내었다. 따라서 테크노스트레스가 생산성에 부정적으로 작용될 수 있기 때문에, 장기적이며 지속적인 경쟁력을 확보하기 위하여 새로운 정보통신기술의 도입을 준비하는 단계에서부터 조직 구성원들에 대한 체계적인 관리가 요구된다고 할 수 있겠다.

• 중환자간호학회지
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• 제9권2호
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• pp.36-47
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• 2016

Purpose: The study examined core job characteristics and job preference to explain work performance among critical care nurses. The theoretical model was constructed based on the job characteristics model with core job characteristics as exogenous variables, and work performance and job preference as endogenous variables. Methods: A total of 228 hospital nurses participated in the study from May to September, 2015. Data were collected through structured questionnaires and analyzed using structural equation modeling. Results: The model showed a good fit to the data with $x^2/df=2.90$, goodness of fit index = .91, root mean square residual = .20, comparative fit index = .93, and incremental fit index = .93. The core job characteristics explained 64% of the variance in job preference. The core job characteristics and job preference explained 52% of the variance in work performance. Conclusions: The core job characteristics can explain the work performance among critical care nurses through job preference. Effective strategies to improve the work performance among critical care nurses should focus on the application of the core job characteristic into a productive work environment. Further studies are warranted to explore the role of job preference of critical care nurses in promoting their work performance.

• Journal of Animal Science and Technology
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• 제59권4호
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• pp.8.1-8.17
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• 2017

Growth promoters have been widely used as a strategy to improve productivity, and great benefits have been observed throughout the meat production chain. However, the prohibition of growth promoters in several countries, as well as consumer rejection, has led industry and the academy to search for alternatives. For decades, the inclusion of phytochemicals in animal feed has been proposed as a replacement for traditional growth promoters. However, there are many concerns about the application of phytochemicals and their impact on the various links in the meat production chain (productive performance, carcass and meat quality). Therefore, the effects of these feed additives are reviewed in this article, along with their potential safety and consumer benefits, to understand the current state of their use. In summary, the replacement of traditional growth promoters in experiments with broilers yielded benefits in all aspects of the meat production chain, such as improvements in productive performance and carcass and meat quality. Although the effects in pigs have been similar to those observed in broilers, fewer studies have been carried out in pigs, and there is a need to define the types of phytochemicals to be used and the appropriate stages for adding such compounds. In regard to ruminant diets, few studies have been conducted, and their results have been inconclusive. Therefore, it is necessary to propose more in vivo studies to determine other strategies for phytochemical inclusion in the production phases and to select the appropriate types of compounds. It is also necessary to define the variables that will best elucidate the mechanism(s) of action that will enable the future replacement of synthetic growth promoters with phytochemical feed additives.

• Asian-Australasian Journal of Animal Sciences
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• 제28권8호
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• pp.1105-1115
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• 2015

Fifty 3-month-old male Tan lambs (similar in body weight) were divided into 5 groups to investigate the effects of different restricted pasture grazing times and indoor supplementation on the productive performances and fatty acid composition of the intramuscular fat in growing lambs. The lambs grazed for different periods of time (12 h/d, 8 h/d, 4 h/d, 2 h/d, and 0 h) and received various amounts of supplementary feedings during the 120-day trial. Pasture dry matter intake (DMI), total DMI, average daily gains and the live body weights of the lambs were measured during the experiment. The animals were slaughtered at the end of the study, their carcass traits were measured, and their longissimus dorsi muscles were sampled to analyze the intramuscular fat (IMF) content and fatty acid profiles. The results indicated that the different durations of grazing and supplementary feedings affected the animal performances and the composition of fatty acids. Grazing for 8 h/d or 2 h/d with the corresponding supplementary concentrate resulted in lambs with higher body weights, carcass weights and IMF contents. Lambs with longer grazing times and less concentrate accumulated more healthy fatty acids such as conjugated linoleic acid and n-3 polyunsaturated fatty acid and had higher n-3/n-6 ratios. Overall, a grazing allowance of 8 h/d and the corresponding concentrate was recommended to maintain a high quantity and quality of lamb meat.

• Asian-Australasian Journal of Animal Sciences
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• 제25권7호
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• pp.945-949
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• 2012

Yerba Mate (Ilex paraguariensis), a tea known for its high antioxidant content, was supplemented to 30 of 60 ewes for 13 wks to assess its effect on their productive performance. A 2.5% inclusion rate of Yerba Mate (YM) in a pelleted concentrate diet decreased feed intake and live weight (LW) during the first few weeks post partum (p<0.001). Overall, the YM group ate less ($2,092{\pm}78g/d$) pellet than the control (CTRL) one ($2,434{\pm}83g/d$); similarly, LW was lower in the YM group compared to the CTRL one, $64.9{\pm}1.6kg$ and $67.3{\pm}1.4kg$, respectively. Lambs' birth weight and growth rates were not affected. At birth, lambs' LW were similar between the Yerba Mate and control groups ($4.2{\pm}0.5kg$ and $4.1{\pm}0.4kg$, respectively. At the end of the trial, Yerba Mate lambs weighed $15.7{\pm}0.4kg$ while CTRL lambs weighed $16.1{\pm}0.4kg$. Average daily growth rate was similar between the two groups and ranged from $176{\pm}19$ to $234{\pm}24g/d$. The inclusion of Yerba Mate in a pelleted diet increased milk fat, protein and total solids content while it decreased milk lactose content. Further work is required to investigate the mechanisms by which Yerba Mate supplementation affects feed intake and milk composition.

• 한국초등수학교육학회지
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• 제17권1호
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• pp.143-164
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• 2013

최근 수학적 의사소통에 관한 관심이 부각되었으나 실제 교사가 수학 시간에 의미 있는 논의를 하기 위해서 무엇을 해야 하는지에 관한 구체적인 안내는 별반 없다. 이에 본 연구는 Smith와 Stein(2011)의 효과적인 수학적 의사소통을 위한 교사의 5가지 관행, 즉 예상하기, 점검하기, 선정하기, 계열짓기, 연결하기를 토대로 20개의 초등학교 우수 수업 동영상 및 지도안을 대상으로 그 실행 수준을 분석하였다. 연구 결과 바람직하지 않거나 부족한 부분이 포함되어 관행이 이루어지는 1수준과 2수준이 가장 높은 빈도로 나타났으며, 관행이 매우 잘 구현되는 3수준에 해당하는 수업은 1~2편에 불과하였다. 관행별로 살펴보면, 점검하기와 선정하기의 경우 2수준의 빈도가 가장 높은 반면, 나머지 관행의 경우 1수준이 가장 높은 빈도로 나타났다. 이와 같은 결과를 토대로 선행 연구와 관련지어 효과적인 수학적 의사소통을 하기 위한 교사의 관행에 대해 논의하였다.