• Title/Summary/Keyword: Total Average Cost

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A Manufacturing/Remanufacturing System with the Consideration of Required Quality of End-of-used Products

  • Guo, Jianquan;Ko, Young-Dae;Hwang, Hark
    • Industrial Engineering and Management Systems
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    • v.9 no.3
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    • pp.204-214
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    • 2010
  • A manufacturing/remanufacturing system is investigated with the consideration of required minimum quality of end-of-used products. A constant demand is satisfied by remanufacturing end-of-used products and manufacturing raw materials outsourced from outside. It is assumed in this system that the buyback price and remanufacturing cost are related to the different quality level of end-of-used products. For remanufacturing, only the used products that satisfy a required minimum quality level will be recycled. Thus, the returning rate is a function of the required minimum quality level. Functions of returning rate, buyback price and remanufacturing cost, which are closely connected to the quality level of end-of-used products, are investigated here. Treating the required minimum quality level of end-of-used products, the length of a cycle, the number of manufacturing lots and remanufacturing lots in a cycle as decision variables, the mathematical models with the objective of minimizing the average total cost are constructed. Through construction of a solution process based on Tabu Search algorithm and calculating examples, the validity of the models is illustrated.

A Study on Computation of the Reduction Rate in the Total Cost of Ownership of the Open Source Software in Comparison to the Commercial Software (상용소프트웨어대비 공개소프트웨어 총소유비용 절감비율 산정에 관한 연구)

  • Kim, Shin-Pyo;Kim, Tae-Yeol;Park, Keun-Ha
    • Journal of Digital Convergence
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    • v.11 no.3
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    • pp.115-126
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    • 2013
  • The purpose of this study was to confirm the extent of the reduction in the total cost of ownership of the open source software in comparison to the commercial software installed for information system, PC and cloud computing. Accordingly, the actual reduction rates in the total cost of ownership, when open source software is installed in the information system, PC and cloud computing, were computed and analyzed for 51 companies in the area of information system, 18 companies in the area of PC and 6 companies in the area of cloud computing, which included government institution, educational institution and private enterprises. The results of expert survey illustrated that the reduction rates are (1)63.3% on the average for the 4areas of information system, namely, DBMS, WAS, Web and OS, (2) 59.4% on the average for the 6 areas of PC, namely, OS, Documentation Program, Back-up and Restoration, Screen Capture, Vaccine and Others and (3) 61.2% on the average for the 6 areas of cloud computing, namely, Virtualization, OS, WEM/WAS, DBMS, DFS and Cloud Management.

A Study on the Homemakers Knowledge and Attitudes About Nutrition (주부(主婦)들의 영양지식(營養知識)과 태도(態度)에 관한 연구(硏究) - 서울시(市) 일부지역(一部地域)을 중심(中心)으로 -)

  • Lee, Hee-Sook;Chang, You-Kyung
    • Journal of Nutrition and Health
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    • v.18 no.2
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    • pp.90-97
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    • 1985
  • The objective of this study is to collect basic data which can lead effective direction in performing nutritional education, by investigating 273 homemakers' knowledge and attitudes about nutrition. This study was performed using questionnaire about the knowledge and the attitudes of nutrition according to the age, education level, occupation, food cost, and total income. Results were summarized as follows; 1) sources in the knowledge of nutrition appeared by order of T.V., cookbooks, magazines newspapers, mothers, friends, lecturers in cooking school, and nutritionist. 2) A level in the knowledge of nutrition which scord an average marks 154.7(the highest marks 210) was higher compared to other studies. Informations about food composition scord lower marks than other studies. 3) Attitudes about nutrition showed high score in the aspects that nutrition has an important role in health, and desirable eating habits were formed in childhood. 4) The knowledge of nutrition had no significant differences with age, occupation, and food cost whereas it had significant correlation with education level and total income. The higher the level in education and total income, the higher the level in the knowledge of nutrition. 5) The attitudes about nutrition had no correlation with age, occupation, but it had a significant correlation with education level, food cost and total income. 6) There was an significant correlation between the knowledge and attitudes about nutrition. In order to promote children's nutrition status, nutrition education for mothers must be accomplished in the first place. Development of T.V. program for children's nutrition education is desirable.

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A Study on Medical Costs for Patients with Vertigo Based on 2014 Health Insurance Review & Assessment Service-National Patients Sample Data (2014년 건강보험심사평가원 환자표본데이터 분석을 이용한 현훈환자의 의료비용에 관한 연구)

  • Kim, Bong Joo;Kang, Hyung Won;Kim, Nam-Kwen;Seo, Eun-Sung
    • Journal of Oriental Neuropsychiatry
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    • v.29 no.3
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    • pp.135-144
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    • 2018
  • Objectives: The purpose of this study was to analyze the medical cost for patients with vertigo and to examine associations between chronic vertigo and mental disorder using 2014 Health Insurance Review & Assessment Service-National Patients Sample (HIRA-NPS). Methods: We analyzed sociodemographic characteristics, medical cost and medical care use pattern for vertigo patients. We used hierarchical multiple logistic regression analysis to examine odds ratio between chronic vertigo and mental disorder. Results: A total of 46,502 people and 118,504 claims data were identified for vertigo cases. Characteristics of vertigo patients have significant differences on proportion of female patients (68.36%), patients' average age (54.98) and proportion of medical assistance (5.76%) compared with non-vertigo patients. Results revealed that Korean medicine are one of frequent methods among total treatments for vertigo patients. Total days of medical care and total costs are 2.78 days and 111,362 won, respectively, and days for outpatients in Korean medical care (mean: 2.26 days) are more than those (mean: 5.05 days) in Western medical care. There is significant difference relative to sex between acute vertigo and chronic vertigo. The odds ratio between chronic vertigo and mental disorder is estimated as 1.34, that means risk of becoming chronic is 34% higher for vertigo patients with mental disorder. Conclusions: This study assessed socio-demographic characteristics, medical care use and expenses related to vertigo, and estimated associations between chronic vertigo and mental disorder. Findings provide a basis for economic evaluation studies on vertigo patients and development of clinical practice guidelines for vertigo patients with mental disorder.

Environmental Regulation and Technological Constraint (환경규제와 기술제약 -한국지역제조업을 중심으로-)

  • Kang, Sang Mok;Gim, Uhn Soon
    • Environmental and Resource Economics Review
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    • v.11 no.3
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    • pp.345-375
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    • 2002
  • The purpose of this paper is to measure the change of the production efficiency which may happen when environmental regulation incurs technological constraint in the process of production, and to compute the opportunity cost of pollution reduction with the lost products based on the change of efficiency. The patterns of production technoloy in the paper are divided into the technologies of strong disposability and weak disposabilty to grasp the effect of the technological constraint due to the environmental regulation. The endowment of the technolgical constraints in the process of production is considered to bring the greatest restriction on firm's production. When the environmental efficiencies of Korean regional manufactures were measured with linear programming model, the lost products related with the constraint of production technology that environmental regulation incurred, was average 148.1 billion dollar per year(5.87% of one year overall products) for total manufactures in 1991~1998. The ratio of the lost products for total products was spread from 0.78% to 1l.08%. The average lost products of 15 regions were changed from 4.66% to 18.35% of total products. Generally the environmental efficiency index of regional manufactures being decreased continuously since 1991, it is estimated that the environmental performance of Korean manufactures has been more and more deteriorating.

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The Factors Affecting the Profitability of Oriental Medicine Hospital of University in Korea (대학부속 한방병원의 수익성 영향요인 연구)

  • Lee, Woo Chun
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.9 no.2
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    • pp.109-116
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    • 2014
  • In this study, the factors affecting the profitability of the oriental medicine hospitals of University to be analyzed. To do this, profitability indicators and current ratio, liquidity, turnover ratio, cost factors analysis and suggested ways to improve management. The results are as follows, the operating margin(1.17%). the return on assets(3.76%), the net profit to gross revenues(2.37%), and the net profit to total assets(-1.89) were lower than the average of the entire oriental medicine hospitals in Korea(respectively 8.9%, 8.7%, 2.6%, 2.5%). Current ratio(256.76%), quick ratio(231.17%), fixed ratio(121.02%), and total assets turnover(135.69%) were similar to the average of all oriental medicine hospitals in Korea. But growth rate of total assets(-2.21%), and growth rate of patient revenue(1.89%) is low. And salaries(53.39%), materials costs(16.62%), administrative expenses(28.58%) were different to the average of all oriental medicine hospitals in Korea(respectively 35.3%, 10.7%, 45.1%). Meanwhile, the cost ratio of the oriental medicine hospitals of University was 98.59%. It was 7.49% higher than the 91.1% of the average of all oriental medicine hospitals in 2011. Correlation analysis, growth rate of patient revenue and operating margin increased at the same time, and net profit to gross revenues and net profit to total assets with a growth rate of total assets increased. And administrative expenses and profitability indicators showed a negative correlation. It means, in order to improve the profitability of the oriental medicine hospitals of University should focus on reducing administrative expenses. Multiple regression analysis, growth rate of total assets, total assets turnover, administrative expenses, and salaries has affected the profitability. Therefore, in order to improve the profitability of the oriental medicine hospitals of University to increase the total capital and the total capital turnover, and to reduce administrative expenses effort.

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Assessment of Foodservice management practices and Nutritional adequacy of foods served in child-care centers (보육시설 급식소의 운영현황 및 급식실태 조사)

  • Kwak, Tong-Kyung;Lee, Hye-Sang;Jang, Mi-Ra;Hong, Wan-Soo;Yoon, Gae-Soon;Lyu, Eun-Soon;Kim, Eun-Kyung;Choi, Eun-Hui;Lee, Kyung-Eun
    • Journal of the Korean Society of Food Culture
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    • v.11 no.2
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    • pp.243-253
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    • 1996
  • The purpose of this study was to evaluate the foodservice management practices in child-care centers in order to provide basic information for the development of a model of a centralized food service information center. This approach was achieved using a variety of qualitative and quantitative information including general foodservice management practices and plate waste. A self-completed questionnaire survey of 651 child-care centers in Korea was undertaken and detailed information was carefully collected at 6 representative child-care centers. The results of the empirical survey were as follows: 1. Child-care centers categorized by location were in large cities (59.9%), medium cities (27.6%) and in provincial areas (12.5). 2. Private sector of child-care centers was 46.4% of the total followed by National/public (44.2%) and licensed home day-care programs (9.4%). 3. Total average number of children in child-care centers was $63.3{\pm}43.1$ with a very significant difference (p<0.001) in types of child-care centers. 4. The average space of kitchen and dining room was $5.0{\pm}3.8\;and\;10.8{\pm}11.0$ pyung ($1pyung=3.3058\;cm^2$). 5. The average cost of interim snack in morning and afternoon in child-care centers were $345.9{\pm}459.3$ won and $359.3{\pm}226.6$ won respectively. The average cost of lunch was $644.0{\pm}481.1$ won. There was a significant difference (p<0.001) by types of child-care centers with a highest cost of 863.9 won in licensed home day-care programs. 6. Only a limited number of dietitian were employed, therefore most of food service management practice was not conducted by professional personnel. 7. The result of nutritional analysis of the food revealed that the level of energy and nutrients contained in the food was below the recommeded level (RDA/3).

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The Impact of Market Environments on Optimal Channel Strategy Involving an Internet Channel: A Game Theoretic Approach (시장 환경이 인터넷 경로를 포함한 다중 경로 관리에 미치는 영향에 관한 연구: 게임 이론적 접근방법)

  • Yoo, Weon-Sang
    • Journal of Distribution Research
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    • v.16 no.2
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    • pp.119-138
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    • 2011
  • Internet commerce has been growing at a rapid pace for the last decade. Many firms try to reach wider consumer markets by adding the Internet channel to the existing traditional channels. Despite the various benefits of the Internet channel, a significant number of firms failed in managing the new type of channel. Previous studies could not cleary explain these conflicting results associated with the Internet channel. One of the major reasons is most of the previous studies conducted analyses under a specific market condition and claimed that as the impact of Internet channel introduction. Therefore, their results are strongly influenced by the specific market settings. However, firms face various market conditions in the real worlddensity and disutility of using the Internet. The purpose of this study is to investigate the impact of various market environments on a firm's optimal channel strategy by employing a flexible game theory model. We capture various market conditions with consumer density and disutility of using the Internet.

    shows the channel structures analyzed in this study. Before the Internet channel is introduced, a monopoly manufacturer sells its products through an independent physical store. From this structure, the manufacturer could introduce its own Internet channel (MI). The independent physical store could also introduce its own Internet channel and coordinate it with the existing physical store (RI). An independent Internet retailer such as Amazon could enter this market (II). In this case, two types of independent retailers compete with each other. In this model, consumers are uniformly distributed on the two dimensional space. Consumer heterogeneity is captured by a consumer's geographical location (ci) and his disutility of using the Internet channel (${\delta}_{N_i}$).
    shows various market conditions captured by the two consumer heterogeneities.
    (a) illustrates a market with symmetric consumer distributions. The model captures explicitly the asymmetric distributions of consumer disutility in a market as well. In a market like that is represented in
    (c), the average consumer disutility of using an Internet store is relatively smaller than that of using a physical store. For example, this case represents the market in which 1) the product is suitable for Internet transactions (e.g., books) or 2) the level of E-Commerce readiness is high such as in Denmark or Finland. On the other hand, the average consumer disutility when using an Internet store is relatively greater than that of using a physical store in a market like (b). Countries like Ukraine and Bulgaria, or the market for "experience goods" such as shoes, could be examples of this market condition. summarizes the various scenarios of consumer distributions analyzed in this study. The range for disutility of using the Internet (${\delta}_{N_i}$) is held constant, while the range of consumer distribution (${\chi}_i$) varies from -25 to 25, from -50 to 50, from -100 to 100, from -150 to 150, and from -200 to 200.
    summarizes the analysis results. As the average travel cost in a market decreases while the average disutility of Internet use remains the same, average retail price, total quantity sold, physical store profit, monopoly manufacturer profit, and thus, total channel profit increase. On the other hand, the quantity sold through the Internet and the profit of the Internet store decrease with a decreasing average travel cost relative to the average disutility of Internet use. We find that a channel that has an advantage over the other kind of channel serves a larger portion of the market. In a market with a high average travel cost, in which the Internet store has a relative advantage over the physical store, for example, the Internet store becomes a mass-retailer serving a larger portion of the market. This result implies that the Internet becomes a more significant distribution channel in those markets characterized by greater geographical dispersion of buyers, or as consumers become more proficient in Internet usage. The results indicate that the degree of price discrimination also varies depending on the distribution of consumer disutility in a market. The manufacturer in a market in which the average travel cost is higher than the average disutility of using the Internet has a stronger incentive for price discrimination than the manufacturer in a market where the average travel cost is relatively lower. We also find that the manufacturer has a stronger incentive to maintain a high price level when the average travel cost in a market is relatively low. Additionally, the retail competition effect due to Internet channel introduction strengthens as average travel cost in a market decreases. This result indicates that a manufacturer's channel power relative to that of the independent physical retailer becomes stronger with a decreasing average travel cost. This implication is counter-intuitive, because it is widely believed that the negative impact of Internet channel introduction on a competing physical retailer is more significant in a market like Russia, where consumers are more geographically dispersed, than in a market like Hong Kong, that has a condensed geographic distribution of consumers.
    illustrates how this happens. When mangers consider the overall impact of the Internet channel, however, they should consider not only channel power, but also sales volume. When both are considered, the introduction of the Internet channel is revealed as more harmful to a physical retailer in Russia than one in Hong Kong, because the sales volume decrease for a physical store due to Internet channel competition is much greater in Russia than in Hong Kong. The results show that manufacturer is always better off with any type of Internet store introduction. The independent physical store benefits from opening its own Internet store when the average travel cost is higher relative to the disutility of using the Internet. Under an opposite market condition, however, the independent physical retailer could be worse off when it opens its own Internet outlet and coordinates both outlets (RI). This is because the low average travel cost significantly reduces the channel power of the independent physical retailer, further aggravating the already weak channel power caused by myopic inter-channel price coordination. The results implies that channel members and policy makers should explicitly consider the factors determining the relative distributions of both kinds of consumer disutility, when they make a channel decision involving an Internet channel. These factors include the suitability of a product for Internet shopping, the level of E-Commerce readiness of a market, and the degree of geographic dispersion of consumers in a market. Despite the academic contributions and managerial implications, this study is limited in the following ways. First, a series of numerical analyses were conducted to derive equilibrium solutions due to the complex forms of demand functions. In the process, we set up V=100, ${\lambda}$=1, and ${\beta}$=0.01. Future research may change this parameter value set to check the generalizability of this study. Second, the five different scenarios for market conditions were analyzed. Future research could try different sets of parameter ranges. Finally, the model setting allows only one monopoly manufacturer in the market. Accommodating competing multiple manufacturers (brands) would generate more realistic results.

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  • A study on the Efficient Improvement of Meal cost Management in Elementary School Foodservice - A comparison of commissary with conventional school foodservice systems - (학교급식비 관리의 효율적 개선을 위한 연구 - 공동조리 및 단독조리 급식학교의 비교 -)

    • Choe, Eun-Hui;Lee, Jin-Mi;Gwak, Dong-Gyeong
      • Journal of the Korean Dietetic Association
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      • v.1 no.1
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      • pp.54-65
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      • 1995
    • Commissary school foodservice system has been expanded rapidly in elementary foodservices in Korea. Therefore, it is essential that cost effectiveness should be assessed by comparing between alternative systems. The objectives of this study were to assess the effects on meal costs of foodservice systems and other school characteristics in terms of meal costs/day per 1 person ; to examine financial management practices and dietitians' perception concerning importance of school foodservices financial management. A total of 16 commissary schools in nationwide and 102 conventional schools at Chungnam province and Seoul were participated in this survey by mails. The results are as follows 1. Average meal costs per one person was 1,232.6 won evaluated on the standards of monthly budget basis on June, 1994. Average food costs per one person was 836.1 won(67.83%), average labor cost was 320.1 won(25.97 %) and operation costs was 76.3 won(6.2 %). 2. Average meal costs per one person did not show any significant difference between commissary and conventional foodservice schools. Meal costs of the island type and the rural type were significantly higher than those of the urban type. Meal costs of schools in Chungnam and other province were higher than schools in Seoul. The schools with less than 200 feeding numbers were higher than the schools more than 201 in meal costs per one person. 3. Food costs per one person were higher in the urban type, especially in Seoul, as the scale of feeding number increased. Labor costs and operational costs were increased in island type as well as in the schools of small feeding numbers. 4. Foodservice teachers, not dietitians were in charge of foodservice duties at the 75 % of satellites. Dietitians participated in the satellite foodservice duties were only averaged at 2.19 visits per month of 20 feeding days. 5. Items which influenced by food costs per person at the step of foodservice production were purchasing method, the perception of inventory, the distributor for foodservice, and usage of standardized recipes.

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    LC-GM2: Low-Cost Global Mobility Management Scheme in Proxy Mobile IPv6 Networks (프록시 모바일 IPv6 네트워크에서 저비용의 글로벌 이동성관리 기법)

    • Kim, Jongyoun;Park, Jongsun;Jeong, Jongpil
      • KIPS Transactions on Computer and Communication Systems
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      • v.1 no.3
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      • pp.193-204
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      • 2012
    • This paper specifies a low-cost global mobility management architecture and protocol procedure called LC-$GM^2$, which is based on Proxy Mobile IPv6. In LC-$GM^2$, mobility management is performed by the network entity. The benefit is the elimination of the wireless link data delivery tunnel overhead between a mobile node and the access router. To compare with the well-known Hierarchical Mobile IPv6 mobility management protocol and GPMIP, the location update, packet delivery, and total cost functions generated by a mobile node during its average domain residence time are formulated for each protocol based on Fluid-flow mobility model. Then, the impacts of various system parameters on the cost functions are analyzed. The analytical results indicate that the proposed global mobility management protocol can guarantee lower total costs.


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