• International Journal of Highway Engineering
• /
• v.11 no.1
• /
• pp.135-144
• /
• 2009

The purpose of this study is to develop a simple and rational crack evaluation system using Marshall tester. Fracture energy were used as a parameter to evaluate the crack resistance of asphalt mixtures. Marshall tester basically measures the vertical deformation obtained from the linear variable differential transformer(LVDT) attached on the specimen's exterior, which can cause a measurement error due to the local deformation near the loading head. Therefore, the validity of the measurement system of Marshall tester should be tested to use it in calculation of fracture energy. Two types of indirect tensile strength tests were performed using four types of asphalt mixtures at two temperature conditions. From the tests, it was shown that local deformation near the loading head had not occurred before a specimen was fractured, so that it did not cause the measurement error of fracture energy. And also from the statistic analysis, the coefficient of variation of vertical deformation measurements obtained on specimen's exterior is less than 15%. Thus, vertical deformation measurements obtained on the specimen's exterior can be used in crack evaluation system using Marshall tester.

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06c
• /
• pp.132-137
• /
• 2008

최근 들어, 기업의 내재 가치를 평가하여 투자에 활용하는 이른바 가치투자에 대한 많은 분석과 전략들이 나오고 있다. 그러나 현존하는 대부분의 투자 지원 툴들은, 단기적으로 등락을 반복하는 주가에 매매 조건을 제시하여 차액을 얻는 방식인 기술적 분석 툴로서 기업의 내재 가치를 평가하여 투자를 지원하기 에는 제한이 있다. 때문에 가치 투자자들은 기업의 가치를 체계적이고 객관적으로 판단하기 보다는, 몇몇의 공시된 자료들을 보고 개인의 판단에 따라 평가하는 경우가 대부분이다. 따라서 감정과 선입견을 배제한 기존의 기술적 분석 툴과 같이 기업의 가치를 정량적으로 추정하여 다양한 전략개발을 할 수 있는 툴이 필요한 실정이다. 본 논문에서는 기업의 가치를 정량화하여 가치투자 전략을 개발할 수 있는 가치투자 시스템(이하 KPU-VISS)의 설계 및 구현 내용을 기술한다. 즉, 본 시스템은 주식가격을 포함한 기업의 다양한 정보와 경기 지표 등을 이용하여 기업의 가치 모델 개발을 지원하고, 이 모델에 근거하여 저평가된 종목을 검색하는 전략 개발을 지원한다. 또한, 개발된 전략을 과거의 특정 시점에 반영시킨 투자 시뮬레이션을 통하여, 전략의 실효성을 검증하는 기능도 지원한다. 본 논문에서 제안한 가치투자 지원시스템은 최초로 가치투자전략의 개발과 검증을 지원하는 시스템으로, 향후 가치투자 시스템 개발을 위한 선도적인 방향을 제시할 것으로 예상한다.

• Journal of the Korean GEO-environmental Society
• /
• v.11 no.9
• /
• pp.39-45
• /
• 2010

Controlled low strength material(CLSM) is produced by mixing portland cement, fine aggregates, water and chemical admixtures. Sand is the most commonly used as the fine aggregates in the conventional CLSM. It is getting more and more difficult to obtain sand in Korea so it is required that the alternative materials be developed as the replacement of sand. Since the engineering characteristics of coal ash are similar to the sand, it becomes necessary to examine the application of the coal ash as the alternative material for CLSM and as the environment-friendly material. When the results meet the optimum pH level that plants can live, it can be expanded the scale of application of the study on the plant as the important field. This study was subjected to present the method to reduce the pH range of CLSM to a suitable condition that plants can survive. To verify this method, the care of neutralization was conducted by immersing the specimen to Ammonium monohydrogen phosphate. Before curing and neutralization, the maximum pH of developmental CLSM is approximately 11. However, the pH value of developmental CLSM has under 9.5 after peaceful curing and neutralization management.

• The Journal of the Korea Contents Association
• /
• v.21 no.7
• /
• pp.59-70
• /
• 2021

This paper studies and analyzes the effect of illustrations in picture books on time representation with fictional picture books as the study scope. In this paper, the time type of picture books can be divided into time point, timeline and time rhythm, referring to case analysis from time symbolic elements, picture layout and picture sequence respectively. First of all, time symbolic elements are referred to the time point and time rhythm. The materialized time symbolic element is things that can directly represent time and trigger associations with time; the color symbolic element means the color changes in the real world within a certain time; the contrast of light and shadow corresponds to the changes in a day. Fast-moving objects will be presented with dashed or blurred lines, while static, stable and slow objects will be depicted with solid lines. Secondly, the picture layout of illustrations in picture books is suitable for representing the content of the timeline and describing the sequence or causality of events. Finally, the picture sequence can represent the timeline, time rhythm and "synchronicity". It will make use of visual logic to win readers' trust in time information expressed in pictures, and then follow and connect viewpoints on the basis of adapting to reading habits. The essence of time representation in picture books is to express time by space, and use different combinations of elements in space and visual guidance to convey time information.

• Journal of the Korea Concrete Institute
• /
• v.15 no.1
• /
• pp.87-94
• /
• 2003

Construction plan and strength control have limitations in construction production field because it is difficult to predict the form removal strength and development of specified concrete strength. However, we can have reasonable construction plan and strength control if prediction of concrete strength is available. In this study, firstly, the newly proposed strength prediction model with maturity method was compared with the logistic model to test the adaptability. Secondly, the determination of time of form removal was verified through the new strength prediction model. As the results, it is found that investigation of the activation energy that are used to calculate equivalent age is necessary, and new strength prediction model was proved to be more accurate in the strength prediction than logistic model in the early age. Moreover, the use of new model was more reasonable because it has low SSE and high decisive factor. If we adopt new strength prediction model at construction field, we can expect the reduced period of work through the reduced time of form removal.

• Journal of the Korea Convergence Society
• /
• v.8 no.1
• /
• pp.181-186
• /
• 2017

We examined the effect of Investor Relation(IR) on financial Ratios. This Study used by using 1,178 sample data from 2007 to 2010. In short, the result of this study's is as followed. Investor Relation(IR) have a positive relevance with financial Ratios variables. Therefore we can support that the firm held Investor Relation(IR) shows the better financial performance according to this study. This study contributes as follow. we can confirm how does a Investor Relation(IR) affect financial performance by this study's result. We hope that this study can be helped development of capital market and give a good news to investors on firms that have good governance level.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.39 no.5
• /
• pp.420-425
• /
• 1994

Soybean seeds deteriorate even before harvest, especially under high temperature and high relative humidity conditions. This study was conducted to determine the effect of harvest date on seed quality in early maturing soybean cultivars. Soybean cultivars used in the experiment were Damyang-native, having small seed with yellow color, and Yuhsuzumi, having large seed with green color. The length of physiological maturity to grain harvest was 24 days in Yuhsuzumi and 8 days in Damyang-native. The moisture contents of seed were 25.3 % in Yuhsuzumi and 14.5 % in Damyang-native cultivar when pod reached its mature pod color. The seed color of Yuhsuzumi started to turn yellow, and its germination rate was greatly decreased when harvest was delayed after maturity, However, Damyang-native cultivars produced seed of high quality regardless of delayed harvest.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.24 no.1
• /
• pp.46-56
• /
• 1979

Korean wheat varieties were tested to evaluate quality characters and the degree of deterioration due to simulated rainfall treatment. The result indicated that old varieties were generally superior in milling, flour color and dough properties to new varieties. And the quality properties of Korean new varieties were not exceeded those of Japanese varieties.

• Proceedings of the Korea Society of Poultry Science Conference
• /
• 2003.11a
• /
• pp.101-102
• /
• 2003

This experiment was conducted to investigate the effect of restricted feeding to pullet on growth pattern and body composition. Conventional diets(C) was formulated by NRC recommendation, and one of restricted diet started from seven to seventeen week of age(T1), and another started from twelve to seventeen(T2) with adjusted eighty percentage amount of conventional diet. Body weight decreased with starting restriction of feeding comparing to the C(P＜0.05), but reached to similar weight in all treatments at twenty week regardless restriction. All of birds started to lay egg around 1,400 to 1,450gram of body weight though the age was in order of C, T2 and T1. Fat contents of restricted group in the body were less than that of C around one thousand gram of body weight. And the tendency of body fat was similar to the first egg. After twenty week, all content of body composition were similar in all treatments. The proportion of intestinal organ weight was higher in T1 than others during restriction.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.12
• /
• pp.471-479
• /
• 2018

This research examines the sustainable mutual growth of academia and industry regarding human resource cultivation and recruitment of local communities. at the beginning of regularized survival competitions and university innovations according to University Basic Competence Evaluations and etc., This research considers the substantive effect of educational resources of universities on recruitment rates in the pursuit of enhancing university-industry cooperation. Therefore, to identify factors of recruitment rates, we employ a university-wise index based on a quantitative index of educational resources of universities. Regarding study methods, set-up and verification of hypothesis, empirical analysis, descriptive statistics analysis, and correlation analysis are used to identify the correlation between dependent variables and independent variables based on the three sub-indexes of open records at Higher Education including educational environments, educational finances, and research achievements. Implications were derived from multiple regression analysis results regarding education conditions and recruitment rates, educational finances and recruitment rates, and research achievement and recruitment rates. This research can be extended to predict regional university recruitment rates with empirical analysis considering regional characteristics.