Joo-Suk Lee

Generic unpacking using entropy analysis

Malwares attempt to evade AV scanners using various obfuscation techniques. Packing is a popular obfuscation technique used by 80% of malwares. In this paper, we propose a generic unpacking mechanism to find the original entry point (OEP) using entropy analysis. The experiment using 110 packed executables demonstrates the proposed mechanism can locate the OEPs of 72% of the packed executables. Furthermore, we show how the mechanism could be applied to packed malwares.

Public's willingness to pay for preventing climate change.

In order to develop the proper policies for preventing climate change, it is necessary to know the public preference for preventing climate change. This study attempts to analyse public Willingness To Pay (WTP) for preventing climate change by applying a Contingent Valuation (CV) method. The estimated mean WTP per household per month in Seoul, Korea, is about 3326 Korean won (approximately GBP 1.60).

Consumers' preferences for the attributes of post-PC: results of a contingent ranking study

With the explosive growth of the internet and the change in consumer demand, post-PC is emerging as a substitute for the existing desktop PC and laptop PC. post-PC is a new computer which is portable with wireless networking, cheaper than the existing PC and specializing in the specific functions that consumers want. Rudimentary post-PCs such as PDA, web-pad and smart-phone are already in use. In the future, owing to technological progress, the heterogeneity of related companies and the low entry barrier, various post-PCs will be developed. This paper attempts to analyse consumers’ willingness-to-pay (WTP) for post-PC with such attributes as portability, CPU speed, data input method (using key board or electric pen), monitor size, and price. To this end, a contingent ranking method is applied, which makes the respondents rank hypothetical post-PC alternatives featuring various combinations of attributes, via a survey data collected in Korea. Using the estimated WTP, the shape and the capacity of future post-PC are predicted and policy implications drawn for national- and company-level R&D strategies.

Assessment of Economic Value of Youngsan River Estuary

This study tried to estimate the environmental value of Youngsan river estuary as there are conflicts on the management policy about Youngsan river estuary. For estimating the detailed functional values of Youngsan river estuary, this study used the contingent valuation method with multi attribute utility theory for. In addition, the survey was separately practiced to on-site and off-site. According to estimating results, the annual value of Youngsan river estuary is about 27.4 billion Korean won. The results of this study are expected to contribute to determine the appropriate level of investment and management policies with regard to the estuary and to provide methodological guidelines for follow-up study.

Assessment of Economic Value of Sangkwan Multi-Purpose Reservoir (I): Benefits of Environmentally-Enhancing Water

This study attempts to estimate the benefits of environmentally-enhancing water ensuing from Sangkwan multi-purpose reservoir. To this end, we apply a survey technique, the contingent valuation (CV) method to elicit the public willingness to pay (WTP). Two CV surveys of randomly selected households were administrated to on-site and off-site areas. As it happens, a number of respondents reported zero WTPs for the environmentally- enhancing water. To deal with the zero WTPs, this study employs a spike model. The results show that average household`s WTP for the environmentally-enhancing water ensuing from Sangkwan multi-purpose reservoir is estimated to be 1,393.7 won for on-site area and 2,237.7 won for off-site area per year. The benefits of environmentally-enhancing water ensuing from Sangkwan multi-purpose reservoir amount to about 38.3 billion won per year. Our findings are expected to contribute to determining an appropriate level of investment and making management policies with regard to the benefits of environmentally-enhancing water.

Assessment of economic value of Sangkwan multi-purpose reservoir (II): benefits of recreational water.

There is imminent need to find a way to measure the recreational benefits of water so that appropriate actions can be taken to make a multi-purpose reservoir. Therefore, this study attempts to apply a choice experiment to quantifying the recreational benefits of a multi-purpose reservoir, using a specific case study of Sangkwan multi-purpose reservoir. We consider the trade-offs between price and attributes of recreational attributes for selecting a preferred alternative and derive the marginal willingness to pay (MWTP) estimate for each attribute. The results show that the MWTP for providing additional 10,000 ton of water is estimated to be 3 won per household per year. The MWTP for improving 1 level of water quality is computed to be 645.5 won per household per year. Moreover, the MWTP for providing recreation facilities is calculated to be 1,518.6 won per household per year. This study allows us to provide policy-makers with useful quantitative information that can reduce uncertainty in the decision-making process related to a multi-purpose reservoir construction projects.

Economic Value of Industrial Water Use

The information on the economic value of industrial water use is widely demanded in policy analysis area as well as academic research area. Therefore, this study attempts to obtain more accurate economic value of industrial water use using the economic theory. To this end, we conducted a survey of 1,017 manufacturing firms and estimated the economic value of industrial water use based on the concept of value of marginal product (VMP). Moreover, this study tried to estimate the VMP of three industrial water types, river water, precipitated water, and purified water. The results show that the VMPs of river water, precipitated water and purified water are estimated to be 769.24 won/, 896.76 won/ and 1,861.95 won/, respectively. The value for the precipitated water found in this study is not significantly different from that (885.1 won/) used in the pre-feasibility test implemented by Korea Development Institute (KDI). These imply that the latter is appropriate for evaluating the economic benefit of supplying industrial water, though it is based on 2003 Industry Survey.

Estimation of Household's Willingness to Pay for Ground Water Pollution Improvement

This paper attempts to examine households` willingness to pay (WTP) for ground water pollution improvement which can be used in cost-benefit analysis on the project for developing the soil pollution control technique. We applied a contingent valuation (CV) method to obtain at least a preliminary evaluation of the WTP. The CV survey was rigorously designed to comply with the guidelines for best-practiced CV studies. We surveyed a randomly selected sample of 500 households in Seoul metropolitan area and asked respondents questions in person-to-person interviews about how they would be willing to pay for the program. Respondents overall accepted the contingent market and were willing to contribute a significant amount (1,195 to 1,552 won), on average, per household per year. The aggregate value of the project for developing the soil pollution control technique amounts to approximately 20.3 billion won per year. The household values can be the benefits that ensue from the project and compared with the costs of the program to determine whether the project is economically desirable.