• Journal of the Korean Operations Research and Management Science Society
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• v.34 no.4
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• pp.185-204
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• 2009

The USIM(universal subscriber identity module)-unlock introducing in July 1, 2008 might be led to a significant change that mobile service provider's dominance is considerably dispersed to the handset manufacturer and distributor. Under USIM-unlock environment, mobile service provider, handset manufacturer, and distributor have to make their decisions on their handset distribution channel strategies: the closed distribution channel strategy or the open distribution channel strategy. The change of distribution channel strategy between members in distribution channel can be understood as a matter of strategy choice, and we have developed a theoretical model and analyzed how to make a decision for the member's optimal distribution strategy based on 3-person game model between members of mobile phone distribution channel, under both of '1 subscriber-1 handset' and '1 subscriber-multiple handset' assumptions. Under '1 subscriber-1 handset' assumption, the closed strategy controlled by mobile service provider is all players' optimal solution because the maximum size of the mobile phone market is limited by subscribers. But, as total expected profit by the handset and distribution subsides is a deficit, mobile service provider have to choose the open strategy and consider the conversion to MNO(mobile network operator). Under '1 subscriber-multiple handset' assumption, mobile service provider is trying to find the way how to lock-in its service and mobile phone and how to maximize ARPU(average revenue per unit), while handset manufacturer and distributor have to look for the way how to maximize the mobile phone market using their own marketing efforts, because it is expected that total mobile handset demand for the open market is bigger than demand for the closed market under '1 subscriber-multiple handset' assumption.

• Journal of the Korean Operations Research and Management Science Society
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• v.38 no.1
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• pp.123-138
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• 2013

Keyword advertising has been used as a promotion tool rather than the advertising itself to online retailers. This is because the online retailer expects the direct sales increase when they deploy the keyword sponsorship. In practice, many online sellers rely on keyword advertising to promote their sales in short term with limited budget. Most of the previous researches use direct revenue factors as dependent variables such as CTR (click through rate) and CVI (conversion per impression) in their researches on the keyword advertising[14, 16, 22, 25, 31, 32]. Previous studies were, however, conducted in the context of aggregate-level due to the limitations on the data availability. These researches cannot evaluate the performance of keyword advertising in the individual level. To overcome these limitations, our research focuses on conversion of keyword advertising in individual-level. Also, we consider manageable factors as independent variables in terms of online retailers (the costs of keyword by implementation methods and meanings of keyword). In our study we developed the keyword advertising conversion model in the individual-level. With our model, we can make some theoretical findings and managerial implications. Practically, in the case of a fixed cost plan, an increase of the number of clicks is revealed as an effective way. However, higher average CPC is not significantly effective in increasing probability of purchase conversion. When this type (fixed cost plan) of implementation could not generate a lot of clicks, it cannot significantly increase the probability of purchase choice. Theoretically, we consider the promotional attributes which influence consumer purchase behavior and conduct individuals-level research based on the actual data. Limitations and future direction of the study are discussed.

• Korean Management Science Review
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• v.31 no.2
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• pp.49-63
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• 2014

With the huge concerns on the inefficiency of public enterprises, particularly a significant amount of debt, an increasing number of studies have been carried out to analyze the levels of inefficiency and investigate the causes of that inefficiency. However, very limited range of analytical methodologies have been used in the efficiency analysis and moreover, the effects of external factors have been little addressed. This study explores the efficiency of urban railway corporations in Korea by utilizing a method of stochastic frontier analysis (SFA). In particular, the potential effects of external factors including residential and floating populations of a station were statistically analyzed. A total of seven Korean urban railway corporations were selected to compare each other in terms of operational efficiency. The results present three important findings. First, the Cobb-Douglas model was found to be more valid for SFA compared to the Translog model. Second, the efficiencies of urban railway corporations in Seoul and Busan are relatively high whereas those of Daejeon and Gwangju are very low in efficiency in the area of sales revenue. In an aspect of number of transport of passengers, Gwangju Metro also showed the lowest efficiency. Third, the external factors are significantly associated with the efficiency, indicating that the efficiencies of Daejeon Metro and Gwangju Metro would increase while the efficiency of Seoul Metro would decreases when the external variables are excluded in the efficiency analysis. The results provide several meaningful implications for managers of the urban railway corporations as well as policy makers who are attempting to resolve the inefficiency problems of public enterprises.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.5
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• pp.919-930
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• 2000

This paper treats a development of visual interactive modeling(VIM) system for ship scheduling problem in integer formulation. The ship scheduling problem can be described as "A problem which assigns ships and cargos to achieve maximum revenue from transportation" in brief. Since late 1970s there has been rapid growth in development and use of VIM as MS10R technology due to the development of computer technology and now VIM has become a important discipline in MS/OR and MIS society. Visual Interactive Modeling is a process that decision maker takes part in modeling life cycle -data collection, formulation, derivation of optimal solution and representation of solution - and interacts with a modeling system to achieve a user-solution appropriate for his/her ultimate goal. This paper suggests the methodology how to collect data, build and modify model, and represent solution using computer graphics as a major driving tool and demonstrates effective performance of a prototype system.pe system.

• Korea Journal of Hospital Management
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• v.8 no.1
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• pp.64-80
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• 2003

The separation policy of prescription and drug dispensing which has been implemented since the 1st of July, 2000, has brought about great changes in patients flow within the healthcare delivery system. The changes in the patients flow, in turn, resulted in the change in the distribution of financial resources among the participating entities in the healthcare delivery system: pharmacies, clinics, small hospitals, general hospitals, and teaching hospitals. The purpose of this study is to shed some light in the change in the financial performance of teaching hospitals under the separation policy that has created environmental changes such as the decrease in the number of out patients visits, the increase in the capital expenditures, the rapid increase in labor costs and so on. For the purpose, this study has compared and analyzed the balance sheets, the income statements and other operational data of three teaching hospitals located in D area. The data include two periods: before(year 1999) and after(year 2001) the implementation of the separation policy. The analysis was conducted with an emphasis on the changes in the financial ratios such as liquidity, turnover ratio, performance ratio. and capitalization ratio. The results show that the financial performances of the hospitals under study were weaker than before the implementation of the separation policy, and that, while the operating expenses have increased remarkably, there was no tendency to corresponding increase in revenue. And the result of analysis of other operational indicators also show that the performance of the hospitals is getting worse. Based on the results, this study has suggested the directions of the healthcare policies. This study suggests to improve the current model of separation of prescription and drug dispensing, to grant subsidies for the training of residents in teaching hospitals, and to lower the rate of patients' out of porket payment in teaching hospitals.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.4 no.1
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• pp.67-88
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• 2009

The purpose of this study IS to suggest the failure factors and the success factors of technology-based startups(TBS). This study surveyed 327 startup companys on the general obstacles of starting business and the entrepreneurship policy of the Government. The failure factors of TBS are 1) overconfidence of TBS in their technology, 2) lack of cost management, 3) lack of concentration on the sales revenue of their activies, 5) many unplanned challenges, and 5) lack of strategic decision. And the success factors of TBS are 1) CEO's leadership having a clear business concept, 2) development of innovative products and services, 3) flat and flexible organization structure, 4) leveraging outside business resources and networks, and 5) strengthening the human resources by the hybrid agent.

• Management & Information Systems Review
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• v.34 no.2
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• pp.207-227
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• 2015

This study addresses and examines differences in firm value after tax audits by the Korean Internal Revenue Service. Tax audits can potentially depreciate a firm's value due to the mass cash outflow that often results from the additional tax charges involved. However, tax audits that reveal negative aspects of a business, such as excessive entertainment expenses, fraudulent accounting, or inappropriate business practices, may have positive effects on a firm's value, as the monitoring involved can improve accounting transparency and reduce agency costs. This study shows that there is typically an increase in a firm's value in the year after a tax audit has been conducted, in comparison with the previous year. This result suggests that firm value can increase after a tax audit is conducted, despite the possible value depreciation resulting from a mass cash outflow.

• Health Policy and Management
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• v.9 no.2
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• pp.55-76
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• 1999

In order to understand the local council members' attitudes to the health policy, we conducted mail surveys using self-administered questionaire for 2 months(February and March. 1995). The study subjects were 2.312 local council members in Korea, but only about 11% among whom. 257 persons, responded to 2 times mail survey. This response rate revealed that the local council members was not interested in health care fields. The main results were as follows; The respondents thought that the economic and income development was most important among 15 regional policy agendas and the health care was the 5th or 7th important agenda. They. who had more health needs of and poor access to health care, tended to think that the health care was more important. They considered lobbying to and persuading the civil servants as the best method to tackle the local health care policy agenda. The respondents, who had poor access to health care facilities. tended to set the highest priority for the expansion of public and private health care resources. They expected that the election of local governor would activate the public health program more than thought that the program was implemented more actively than other region. The main opinion of respondents was that the central government had to take over planning and financing for the public health program, and the basic local government had to implment the program and budgeting. The majority of respondents agreed the private dominant medical care delivery system and nation-wide uniformed financing mechanism. Over 60% of them suggested that they were ready to suffer environmental pollution inducing health hazards for the purpose of regional economic and income development. About 75% of them favour the campaign for antismoking regardless of reducing local government's revenue from sale tax.

• Health Policy and Management
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• v.26 no.2
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• pp.95-106
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• 2016

A new manual of System of Health Accounts (SHA) 2011, was published jointly by the Organization for Economic Cooperation and Development (OECD), Eurostat, and World Health Organization in 2011. This offers more complete coverage than the previous version, SHA 1.0, within the functional classification in areas such as prevention and a precise approach for tracking financing in the health care sector using the new classification of financing schemes. This paper aims to demonstrate current health expenditure (CHE) and National Health Accounts of the years 1970-2014 constructed according to the SHA2011. Data sources for public financing include budget and settlement documents of the government, various statistics from the National Health Insurance, and others. In the case of private financing, an estimation of total revenue by provider groups is made from the Economic Census data and the household income and expenditure survey, Korean healthcare panel study, etc. are used to allocate those totals into functional classifications. CHE was 105 trillion won in 2014, which accounts for 7.1% of Korea's gross domestic product. It was a big increase of 7.7 trillion won, 7.9%, from the previous year. Public share (government and compulsory schemes) accounting for 56.5% of the CHE in 2014 was still much lower than the OECD average of about 73%. With these estimates, it is possible to compare health expenditures of Korea and other countries better. Awareness and appreciation of the need and gains from applying SHA2011 for the health expenditure classification are expected to increase as OECD health expenditure figures get more frequently quoted among health policy makers.

• Health Policy and Management
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• v.17 no.2
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• pp.68-90
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• 2007

Nurse staffing level is an important factor that influences the quality of health service and patient outcomes. This study was carried out to examine the current state of acute hospital nurse staffing and find out factors that affect the nurse staffing level. Nurse staffing of individual hospitals was measured using the number of registered nurses per 100 beds. Descriptive and multiple regression analyses were conducted using 592 acute care hospitals' data. Regression model included structure factors such as referral level, ownership, medical and general staffing, and financial outcome factors such as occupancy rate, inpatient and outpatient revenues. Market characteristics included strength of competition, supply of nurses, and income and health status level of consumers. The average number of nurses per 100 beds was 28 and showed a great variation according to the referral level. Regression model explained this variation as much as 76.87%. Hospital structure variables which affecting the hospital nurse staffing level positively were ICU bed ratio, the staffing level of specialist, training doctor and employees except doctor and nursing personnel, while the negative factor was nurse aid staffing level. General hospitals employed more nurses than hospitals. Among outcome characteristics, occupancy rate and the amount of health insurance inpatient revenue affected positively on the hospital nurse staffing level. The more supply of the new nurse and the higher consumer income and health status in the medical service markets, the more nurses were employed by the medical institutes. According to the study result, hospitals employed more nurses when they had more financial incentive by increasing nurses. This means appropriate hospital incentive policy and regulation policy, which hospital violate nurse staffing level have to pay penality, should be needed. Clarifying job description between nurses and nurse aids and the reentry program for unemployed experienced nurses will be helpful to increase nurse staffing level.