• Environmental and Resource Economics Review
• /
• v.18 no.2
• /
• pp.241-277
• /
• 2009

The purpose of this paper is to compare technical efficiencies and productivities without and with environmental constraints, and shadow prices of $SO_x$ in Korean and Chinese industries. The technical efficiencies without and with environment in Chinese manufacturing industries are higher than those in Korean manufacturing industries for 2000-2004. Most of individual Chinese manufacturing dominate those of Korean manufacturing in levels of technical efficiency. In terms of productivity changes excluding environmental constraints, the rates of annual growth in Korean and Chinese industries show 1.13 percent and 2.73 percent respectively. But Korean industry in productivity changes considering $SO_x$ reduction shows 2.41 percent, higher rate of growth than 1.58 percent of Chinese industry. In the shadow prices of $SO_x$, the reduction of an additional unit of $SO_x$ in the Korean manufacturing needs a decrease of 1.473 unit of output, while the shadow price of $SO_x$ in Chinese manufacturing is 0.0049, close to zero. Korean manufacturing should be specialized in higher sectors of technical efficiency and productivity and be also kept efficient in pollution abatement cost.

• Environmental and Resource Economics Review
• /
• v.31 no.4
• /
• pp.645-668
• /
• 2022

Hydrogen energy is emerging as an important means of carbon neutrality in the various sectors including power, transportation, storage, and industrial processes. Fuel cell power plants are the fastest spreading in the hydrogen ecosystem and are one of the key power sources among means of implementing carbon neutrality in 2050. However, high volatility in system marginal price (SMP) and renewable energy certificate (REC) prices, which affect the profits of fuel cell power plants, delay the investment timing and deployment. This study applied the real option methodology to analyze how the dual uncertainties in both SMP and REC prices affect the investment trigger price level in the irreversible investment decision of fuel cell power plants. The analysis is summarized into the following three. First, under the current Renewable Portfolio Standard (RPS), dual price uncertainties passed on to plant owners has significantly increased the investment trigger price relative to one under the deterministic price case. Second, reducing the volatility of REC price by half of the current level caused a significant drop in investment trigger prices and its investment trigger price is similar to one caused by offering one additional REC multiplier. Third, investment trigger price based on gray hydrogen and green hydrogen were analyzed along with the existing byproduct hydrogen-based fuel cells, and in the case of gray hydrogen, economic feasibility were narrowed significantly with green hydrogen when carbon costs were applied. The results of this study suggest that the current RPS system works as an obstacle to the deployment of fuel cell power plants, and policy that provides more stable revenue to plants is needed to build a more cost-effective and stable hydrogen ecosystem.

• Journal of the Korea Computer Industry Society
• /
• v.3 no.2
• /
• pp.209-216
• /
• 2002

World Wide Web has potential possibility of infrastructure for parallel computing environment connecting massive computing resources, not just platform to provide and share information via browser. The approach of Web-based parallel computing has many advantages of the ease of accessibility, scalability, cost-effectiveness, and utilization of existing networks. Applet has the possibility of decomposing the independent/parallel task, moving over network, and executing in computers connected in Web, but it lacks in the flexibility due to strict security semantic model. Therefore, in this paper, Web-based parallel computing environment using mobile agent, Aglet (Agile applet) was designed and possible implementation technologies and architecture were analyzed. And simple simulation and analysis was done compared with applet-based approach.

• Journal of Environmental Policy
• /
• v.8 no.4
• /
• pp.171-198
• /
• 2009

The issue of burden sharing between sectors has become a pertinent national issue with respect tothe establishment of national greenhouse gas (GHG) reduction targets, and the means to achieve these targets. This study explores methods for equitable sectoral allocation to reduce GHGs based on an allocation index taking into account relevant attributes in line with national GHG emissions trends and structures. This paper considered potential for GHG reduction, rate of increase of emissions, and ability to pay as suitable criteria for analysis of each sector. As a result of the analysis, it was found that equitable allocation methods have significantly different burden sharing compared to allocation that considers only potential for GHG reduction. Accordingly, further empirical study on various simulations based on national economic impact will be essential for better policy solutions. This study will contribute to applying national allocation plans in a logical, consistent and transparent manner.

• Applied Chemistry for Engineering
• /
• v.31 no.6
• /
• pp.585-590
• /
• 2020

Successful early diagnosis of cancer diseases such as lung, prostate, liver and adrenocortical carcinoma is a key step in determining the cost of treatment, survival rate, and cure rate. Most of current cancer diagnosis systems including biopsy, computed tomography (CT), positron emission tomography (PET)-CT, magnetic resonance imaging (MRI), ultrasonography, etc., require expensive and complicated equipment with highly trained human resources. Global medical and scientific communities have thus made numerous efforts on developing effective but rapid disease management system via introducing a wide spectrum of point-of-care medical diagnosis devices. Among them, a lateral flow immunoassay strip technique has gained a great attention due to many advantages such as cost-effectiveness, short inspection time, and user friendly accessibility. In this mini-review, we will highlight recent research trend on the development of colorimetry based LFIA strips for cancer diagnosis and discuss the future research direction and potential applications.

• Korean Journal of Clinical Pharmacy
• /
• v.25 no.3
• /
• pp.159-165
• /
• 2015

Objective: Polypharmacy is one of the main causes of inappropriate medication use, adverse drug-related events and cost. It aimed to investigate the status of polypharmacy and potentially inappropriate medication (PIM), the factors affecting polypharmacy and cost in elderly outpatients. Method: A pharmacy claim data were retrospectively analyzed with elderly patients prescriptions at a pharmacy located near a top tier general hospital. The numbers of medications per person, prevalence of polypharmacy and PIM according to the 2012 Beers criteria and Korea PIM list, medication cost and the factors affecting polypharmacy were investigated. Results: Forty-six percentages of the elderly outpatients received polypharmacy and over 21% of them had medications listed in Beers or Korean PIM. In multiregressional analysis, we found that age, gender and insurance types were affective factors of polypharmacy. (p < 0.001, 0.047, 0.009, respectively). The cost of polypharmacy with PIM in elderly outpatients was increased with age. Various approaches of interventions would be further required.

• Journal of KIISE:Databases
• /
• v.35 no.1
• /
• pp.1-16
• /
• 2008

Join queries having heavy cost are necessary to Data Stream Management System in Sensor Network where plural short information is generated. It is reasonable that each join operator has a sliding-window constraint for preventing DISK I/O because the data stream represents the infinite size of data. In addition, the join operator should be able to take multiple inputs for overall results. It is possible for the MJoin operator with sliding-windows to do so. In this paper, we consider the data stream environment where multiple MJoin operators are registered and propose MMJoin which deals with issues of building and processing a globally shared query considering characteristics of the MJoin operator with sliding-windows. First, we propose a solution of building the global shared query execution plan. Second, we solved the problems of updating a window size and routing for a join result. Our study can be utilized as a fundamental research for an optimization technique for multiple continuous joins in the data stream environment.

• Management & Information Systems Review
• /
• v.28 no.1
• /
• pp.71-97
• /
• 2009

In this study, I compare the ability of alternative accounting method for employee stock option to reflect firm value using the Ohlson's(1995) valuation model for 200 firms. The each methods, I compare are employee stock option expense recognition based on the K-GAAP disclosures, and asset recognition at the grant date based on the SFAS No. 123 Exposure Draft: Accounting for stock-based compensation. The model include: (1) a model that uses reported earnings, equity book value, and compensation expense based on the K-GAAP disclosures; (2) a model that uses pro-forma earnings, equity book value and adds a measure of the unrecognized asset arising form granting of employee stock options. Finding form estimating equations that the K-GAAP method for calculating compensation has no explanatory power, and the SFAS No.123 Draft Exposure method for arising asset and fair value compensation better captures than market's perception of the economic impact of stock options on firm values. However, the correlation of employee stock option compensation expense is positive. These results suggest that incentive benefits derived from employee stock option plans outweigh the cost associated with plan. In addition, I couldn't find evidence that company in KOSDAQ that have high growth potential benefit more from employee stock option plan compared to lager, more mature firm in SEC.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.8 no.4
• /
• pp.81-93
• /
• 2013

The study attempted to explain the differences among the willingness of companies to accept the self-regulation. The study exemplified the $CO_2$ emissions record labelling program, as a self-regulation program which is considered as a concrete action for corporate social responsibility and substantiality management movement. The study investigated how companies respond to the request from a government to accept the program, which may be potentially contributed to both higher social and financial performance. It is hypothesized that first the company may decide whether the acceptance decision is strategic or non-strategic issues. when considered as non-strategic, the decision will be made on the basis of short term expected returns and costs comparison. It is hypothesized that when considered as strategic, the decision will be strongly influenced by the type of corporate perceptions toward environmental regulations, which has been accumulated by past experiences. Also, the study investigated the good management theory and the slack resources theory which differently predict the direction between social performances and financial performances. The results identified the significant relationships among most variables and supported the slack resources theory. Further, the ethical perception positively influenced the willingness to accept the self-regulation.

• Proceedings of the Korea Contents Association Conference
• /
• 2011.05a
• /
• pp.445-446
• /
• 2011

전자정부사업은 본질적으로 이해당사자 사이의 갈등을 내포하고 있어 막대한 사회적 비용을 초래하기 때문에 이에 대한 적절한 조정과 협력이 중요하다. 정부통합전산센터는 정부부처별, 기관별로 구축 운영 중인 전산시설, 운영인력 등 정보자원을 통합하여 공동활용체계를 구축하는 대표적인 전자정부사업으로 현재 대전과 광주에 설치되어 있다. 2006년부터 단계별 통합을 추진하고 있는 정부통합전산센터에는 다양한 IT 거버넌스(IT Governance) 이슈가 잠재되어 있으며 이를 해결하기 위한 방안 마련이 시급하다. 본 연구에서는 IT 거버넌스 관련 문헌연구와 전문가 의견수렴을 통해 조직문화, 업무프로세스, 구성원역량, 커뮤니케이션 분야에서 IT 거버넌스 이슈들을 선정 후 정부부처, 정부통합전산센터 및 외주업체 관계자들을 대상으로 인터뷰와 설문조사를 통해 해결방안을 찾고자 하였다. 본 연구의 결과는 공공부문 IT 거버넌스에 대한 국제적인 성공모델 정립에 기여할 수 있을 것으로 사료된다.