• The Korean Journal of Financial Management
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• v.22 no.2
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• pp.107-133
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• 2005

The object of this study is to examine the informational effect of the rating change announcement on the capital market. For this study, daily stock prices from January 1993 to February 2001 and daily bond prices from July 2000 to February 2001, for the bond market are used. In the stock market, we could not observe any statistically significant stock price reaction to rate change announcements from July 2000 to February 2001. However, if rating agencies announce more than two degradation for the period of January 1993 to February 2001, statistically negative significant stock price reactions are observed. On the other hand, there is no statistically significant stock price reaction to any other rating change announcement. In the bond market, there is no statistically test on the bond price reaction, but the general directions of bond price movements are consistent with the effect we can expect from rating change announcements. Generally, when the rating agencies degraded more than two grades at once, a cumulative abnormal returns move negatively during the overall period. In this case, we can say that rating agencies' role is to confirm information or investor's expectations. However, for the other cases, we could not observe my significant movement before or on the event data.

• Journal of Digital Convergence
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• v.19 no.6
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• pp.113-132
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• 2021

This study is a new evaluation using the Arrhenius equation, which is known as the chemical reaction rate estimation equation, to evaluate the intrinsic and extrinsic value elements of patents as a model. The performance of the evaluation model was superior to the SVM, Logistic reg. and ANN models that were used as patent evaluation models in prior studies. In addition, there was a strong correlation between the predicted lifespan of the patent and the actual lifespan of the patent. These evaluation models may be used for evaluation purposes only, or if an evaluation is required, including a commercialization entity or technical characteristics.

• Journal of Korea Society of Waste Management
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• v.34 no.5
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• pp.518-527
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• 2017

The development of renewable energy is currently strongly required to address environmental problems such as global warming. In particular, biomass is highlighted due to its advantages. When using biomass as an energy source, the conversion process is essential. Fast pyrolysis, which is a thermochemical conversion method, is a known method of producing bio-oil. Therefore, various studies were conducted with fast pyrolysis. Most studies were conducted under a lab-scale process. Hence, scaling up is required for commercialization. However, it is difficult to find studies that address the process analysis, even though this is essential for developing a scaled-up plant. Hence, the present study carries out the process analysis of biomass pyrolysis. The fast pyrolysis system includes a biomass feeder, fast pyrolyzer, cyclone, condenser, and electrostatic precipitator (ESP). A two-stage, semi-global reaction mechanism was applied to simulate the fast pyrolysis reaction and a circulating fluidized bed reactor was selected as the fast pyrolyzer. All the equipment in the process was modeled based on heat and mass balance equations. In this study, process analysis was conducted with various reaction temperatures and residence times. The two-stage, semi-global reaction mechanism for circulating fluidized-bed reactor can be applied to simulate a scaled-up plant.

• The Journal of the Korean dental association
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• v.54 no.1
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• pp.27-38
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• 2016

Objectives: This study evaluated the outcomes of continuing professional education in implant dentistry using Kirkpatrick's four-level evaluation model. Material and methods: The study was carried out through a questionnaire distributed to dentists who attended a continuing professional education in implant dentistry, 2008~2012. They were asked to fill out questionnaires at least 6 months after its completion. Results: Mean ages of total 23 dentist was $44.8^{\circ}{\ae}8.2$. Mean period after completion of education was $2.7^{\circ}{\ae}1.2$. Knowledge (level 2) (r=0.71, p<0.01) and behavior (level 3) (r=0.68, p<0.01) was positively correlated with topic and methods of education in reaction (level 1). Behavior was positively correlated with knowledge (r=0.79, p<0.01). Result (level 4) was positively correlated with knowledge (r=0.64, p<0.01) and behavior (r=0.86, p<0.01). Conclusion: Reaction affects on knowledge, behavior and result in order.

• Journal of Physiology & Pathology in Korean Medicine
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• v.24 no.5
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• pp.753-757
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• 2010

The objectives of this paper is to propose the pharmacoepidemiologic methodology to Research for Sasang Constitutional Pharmacology. We mainly searched "Journal of Pharmacoepidemiology and Risk Management". And we also searched "J Korean Oriental Med.", "J of Sasang Constitutional Med.", "J. Oriental Physiology & Pathology", "Korean J Orient Int Med." using these kew words - "adverse event" or "side effect" and "Sasang Contitution" or "Constitution" or "Constitutional medicine". Through the examination of the Pharmacoepidemiologic methodology and current research for sasang constitiutional pharmacology, we could establish the proposal to collect objective constitutional medical reaction. For the actualization of this proposal, the more advanced studies will have to be carried out continuously.

• Nuclear Engineering and Technology
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• v.49 no.5
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• pp.1019-1030
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• 2017

Diffusion is a crucial mechanism that regulates the migration of radioactive nuclides. In this study, an innovative numerical method was developed to simultaneously calculate the diffusion coefficient of both parent and, afterward, series daughter nuclides in a sequentially reactive through-diffusion model. Two constructed scenarios, a serial reaction (RN_1 ${\rightarrow}$ RN_2 ${\rightarrow}$ RN_3) and a parallel reaction (RN_1 ${\rightarrow}$ RN_2A + RN_2B), were proposed and calculated for verification. First, the accuracy of the proposed three-member reaction equations was validated using several default numerical experiments. Second, by applying the validated numerical experimental concentration variation data, the as-determined diffusion coefficient of the product nuclide was observed to be identical to the default data. The results demonstrate the validity of the proposed method. The significance of the proposed numerical method will be particularly powerful in determining the diffusion coefficients of systems with extremely thin specimens, long periods of diffusion time, and parent nuclides with fast decay constants.

• Journal of Electrochemical Science and Technology
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• v.11 no.1
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• pp.60-67
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• 2020

In this study, copper (II) oxide powder for electroplating was prepared by recovering CuCl₂ from NaClO₃ type etching wastes via recovered non-sintering two step chemical reaction. In case of alkali copper carbonate [mCuCo₃·nCu(OH)₂], first reaction product, CuCo₃ is produced more than Cu(OH)₂ when the reaction molar ratio of sodium carbonate is low, since m is larger than n. As the reaction molar ratio of sodium carbonate increased, m is larger than n and Cu(OH)₂ was produced more than CuCO₃. In the case of m has same values as n, the optimum reaction mole ratio was 1.44 at the reaction temperature of 80℃ based on the theoretical copper content of 57.5 wt. %. The optimum amount of sodium hydroxide was 120 g at 80℃ for production of copper (II) oxide prepared by using basic copper carbonate product of first reaction. At this time, the yield of copper (II) oxide was 96.6 wt.%. Also, the chloride ion concentration was 9.7 mg/L. The properties of produced copper (II) oxide such as mean particle size, dissolution time for sulfuric acid, and repose angle were 19.5 mm, 64 second, and 34.8°, respectively. As a result of the hole filling test, it was found that the copper oxide (II) prepared with 120 g of sodium hydroxide, the optimum amount of basic hydroxide for copper carbonate, has a hole filling of 11.0 mm, which satisfies the general hole filling management range of 15 mm or less.

• Journal of Digital Convergence
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• v.15 no.12
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• pp.647-653
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• 2017

The purpose of this study was to examine the moderating effect of perceived parental empathy in the relationship between self-esteem and adolescent depression. A sample of 437 adolescents completed self-report measures of self-esteem, depression and parental empathy. The collected data were analyzed by hierarchical regression analysis. As a result, parental empathy moderated relationship between self-esteem and depression. And awareness of emotion, empathic emotional reaction, and cold emotional reaction of father had moderating effect on the relationship between self-esteem and depression. In case of mother's empathy, cold emotional reaction and excessive emotional reaction had moderating effect on the relationship between self-esteem and depression. The significance of this study is to find out the important of parental empathy for depressive adolescents who are experiencing self-esteem of low level.

• Journal of Korean Society for Quality Management
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• v.38 no.4
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• pp.561-579
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• 2010

This study is to devide seven subject organs in the metropolitan area by the Malcolm Baldrige's basis which is global standard of management quality to grip the each activities of management quality, to conduct a survey of the management quality of each organ or persons in charge of similar works. Generally, those surveyed show to recognize on the management quality and to apply to real work. Those surveyed show to be able to improve positively quality and service level in case of appling to work of management quality, and to be positive reaction on the contribution about management performance. This study indicates the predominant view which the researcher have to establish the its vision clearly and to promote in a lump success factors of management quality, and the chief executive have to take a firm faith for it. This study also suggest that recognizing positively about its vision and strategy about present condition of management quality activities is one of the implements which not only judge but also establish a good system of an organization. And there has a significant difference between Public and Private Organizations that those evaluate management quality conducts better management performance. However management quality activities shows to mostly agree to be influencing positively to management performance.

• Journal of Families and Better Life
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• v.11 no.1
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• pp.67-79
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• 1993

The purpose of this study were to study the relationships of the locus of control and the frustration reaction of adolescents according to their family-environment. The objects are 369 students in the second grade of middle schools located in Kwangju and Chonnam. The instruments used in this study are "Internal-External locus of control scale for students" (the Nowicki and Strickland's scale translated by Jung Eun-Joo and Son Jin-Hoon) " Picture-Frustration Test" (by Kim Jae Eun and Kim Tai Ryun) The data is produced on frequency distribution percentile average standard deviation F-test Pearson's correlation with SAS computer program. The results are as follows: 1) The internal -external locus of control shows significant differences in the location sex. the number of siblings family pattern father's educational level and mother's occupation. 2) The reaction type for frustration shows statistically significant differences in accordance with their sex the number of siblings birthorder fathers grown-up place parents' age and parents' occupation. 3) The direction of aggression for frustration shows significant difference in according with the location sex the number of siblings birth order family pattern parents' grown-up place and father's educational level. 4) According to the internal-external locus of control the frustration reaction scores are different significantly. Internal adolescents have positive relation with Need-Persistance and Impunitiveness and negative relation with Obstade-Dominance and Extrapunitiveness.