• Korean Management Science Review
• /
• v.32 no.3
• /
• pp.91-103
• /
• 2015

This study recognizes that there is a correlation between the movement of the financial market and the sentimental changes of the public participating directly or indirectly in the market, and applies the relationship to investment strategies for stock market. The concerns that market participants have about the economy can be transformed to the search terms that internet users query on search engines, and search volume of a specific term over time can be understood as the economic trend of big data. Under the hypothesis that the time when the economic concerns start increasing precedes the decline in the stock market price and vice versa, this study proposes three investment strategies using casuality between price of domestic stock market and search volume from Naver trends, and verifies the hypothesis. The computational results illustrate the potential that combining extensive behavioral data sets offers for a better understanding of collective human behavior in domestic stock market.

• Journal of Korea Multimedia Society
• /
• v.20 no.2
• /
• pp.216-224
• /
• 2017

Abnormal situation caused by aggressive behavior of pigs adversely affects the growth of pigs, and comes with an economic loss in intensive pigsties. Therefore, IT-based video surveillance system is needed to monitor the abnormal situations in pigsty continuously in order to minimize the economic demage. Recently, some advances have been made in pig monitoring; however, detecting each pig is still challenging problem. In this paper, we propose a new color image-based monitoring system for the detection of the individual pig using a fast region-based convolution neural network with consideration of detecting touching pigs in a crowed pigsty. The experimental results with the color images obtained from a pig farm located in Sejong city illustrate the efficiency of the proposed method.

• Korean System Dynamics Review
• /
• v.3 no.2
• /
• pp.113-140
• /
• 2002

The cost-benefit analysis is a technique for assisting with decision about the use of society's scare resources. There exists no detailed assessment like cost-benefit analysis. But recently, many policy analysts criticized the merit of cost-benefit analysis. As it is, it can be said that partial or approximate estimates of benefit and cost may be more dangerous than helpful. The purpose of this study is to overcome the limit of traditional cost-benefit analysis. For this purpose, we use the system dynamics approach for setting up new cost-benefit analysis, which we named that ‘Dynamics Cost-Benefit Analysis'. The usefulness of ‘Dynamics Cost-Benefit Analysis' is as follows; finding structural causal relationship between cost factors and benefit factors, understanding the long-term behavior of systems economic feasibility. In this study, we apply 'Dynamic Cost-Benefit Analysis' to case that is construction investment of funeral house by local government sector.

• Economic and Environmental Geology
• /
• v.30 no.3
• /
• pp.231-240
• /
• 1997

The behavior of rocks and microcrack development due to fatigue stresses are investigated using cyclic loading tests and ultrasonic velocity measurements. Twenty six medium-grained granite samples from the Pochon area are selected for measurements. Ultrasonic velocities are measured for samples before fatigue test to characterize the pre-existing microcracks. Then, thirteen different cycles of loadings with 70% and 80% dynamic strength are applied to the samples. The ultrasonic velocities are measured again to compare velocities after applications of fatigue stress with those before applications of fatigue stress. The results show that most microcracks are developed along the direction parallel to the axis of loading and that the amount of microcracks increases, as loading levels and numbers of cycle increase.

• Economic and Environmental Geology
• /
• v.20 no.4
• /
• pp.223-234
• /
• 1987

This paper describes the mode of occurrence and mineralogical properties of electrum from the Namseong Gold-Silver deposits, for the purpose of obtaining data on the characteristics of the ore deposits and the behavior of gold and silver during the mineralization. The gangue minerals are quartz, calcite, fluorite. Ore minerals are mainly composed of pyrite, sphalerite, chalcopyrite and galena with minor amount of argentite, electrum, pyrargyrite, native silver and unidenfied mineral(Cu-Fe-Ag-S series). Three stage of mineralization recognized are, from early to later, (I) pyrite-electrum stage (II) sphalerite-chalcopyrite-galena-argentite-electrum stage (III) sulfosalts stage. The filling temperature of fluid inclusions in quartz ranges from $225^{\circ}$ to $335^{\circ}C$. The value of sulfur fugacity estimated by means of electrum-tarnish method ranges from $10^{-11.5}$ to $10^{-14}$ atm. The compositional heterogeneity within a single grain with respect to gold concentration is common in the Namseong electrums Chemical composition of electrum ranges generally between 25~45 atom% Au. Its gold content decreases in late stages of mineralization.

• Culinary science and hospitality research
• /
• v.5 no.1
• /
• pp.5-24
• /
• 1999

The Dining-out industry should catch up with the rapid change of economic environment actively and achieve the objectives of the company. Therefore, the management of Dining-out industry should be focused on the customers' changeable behavior, which is the center of economic environment, and make customers satisfied as the first factor. The purpose of this study is to find out the relation between the customers' content and the growing of selling in Dining-out industry, to compare with the merit and the demerit of the Dining-out industry objectively, and finally to contribute the increasing of selling in Dining-out industry.

• Journal of Digital Convergence
• /
• v.7 no.3
• /
• pp.1-11
• /
• 2009

In this paper I examined economies and implications of "Net Neutrality" and Internet Freedom. It is argued that mandating Net Neutrality would be likely to reduce economic welfare. Instead, the government should focus on creating competition in the broadband market by liberalizing more spectrum and reducing entry barriers created by certain local regulations. In cases where a broadband provider can exercise market power the government should use its antitrust enforcement authority to police anti-competition behavior. To assure Net Neutrality, it is needed to make sure of fair competition and to facilitate flexible prices. Especially it is needed to invest consistently to the sector of Network.

• Korean Journal of Agricultural Science
• /
• v.39 no.2
• /
• pp.299-306
• /
• 2012

This study conducted an internet survey to explore consumers' behaviors for reducing food wastes and to examine factors affecting their actions. Consumer survey demonstrates that food preparers at home purchase foods two or three times a week on average and most of food wastes are generated in the process of cooking preparation. Results show that consumers who purchase foods at supermarket reduce food wastes by frequently buying a small amount of foods and checking the expiration date. Consumers with higher income diminish food wastes by purchasing appropriate amount of foods. Interestingly, if husband and wife work together for a living, they are more active for decreasing food wastes compared to a single worker.

• Korean Journal of Health Education and Promotion
• /
• v.32 no.5
• /
• pp.53-62
• /
• 2015

Objectives: The purpose of this study was to examine the associations among self-rated health and socioeconomic status. Methods: Analyses were conducted based on cross-sectional data obtained from the Korea Youth Risk Behavior Web-based Survey. A total of 79,202 students aged 12 to 18 years participated in the study and there was a response rate of 95.5%. Separate logistic regression analyses were performed on each gender group based on a set of independent variables. Those being: the level of parental education level; family affluence scale; subjective household economic status; and subjective school achievement with SRH as the dependent variable. Results: Multivariate analyses revealed significant associations between each SES and adolescent SRH after controlling for other covariates. However, in the models that included all SES indicators, subjective household economic status and subjective school achievement remained significant in boys and girls. Conclusions: The findings demonstrated that subjective SES indicators are more closely related to adolescent SRH when compared with objective indicators.

• Journal of Families and Better Life
• /
• v.14 no.2
• /
• pp.35-50
• /
• 1996

This paper is a review and assessment of 1122 articles on families in later life from 5 journals published during 1980 and 1995. theoretical and methodological issues family relationships in later life social support network caregiving attitudes and stress life satisfaction and stress of the aged and welfare system for the aged are the major areas examined. The review indicates that this area of research in quantity has increased rapidly since 195. Relationships between aged parents and their adult children focusing on caregiving attitudes behavior and stresses for supporting their parents among the children and adjustment/life satisfaction of the aged are dominantly investigated. However most of the research are non-theoretical and descriptive in nature and the influences of socio-economic variables such as sex health economic status and educational level on dependent variables are widely investigated. Future research questions and issues under the sub-ares of families in lat r life is provided. Further directions and suggestions for future research works on families in later life in general are provided with particular emphasis on conceptual and methodological issues.