• The Korean Journal of Applied Statistics
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• v.23 no.4
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• pp.621-633
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• 2010

This paper considers a certain expense structure where a vendor of equity-linked investment product will collect its expenses continuously from the investor's account whenever the investment performance exceeds a certain threshold level. Under the Black-Scholes framework, we derive compact convolution formulas for evaluating the total expenses to be collected during the investment period by using the joint Laplace transform of the Brownian motion and its excursion time. We provide numerical examples for illustration.

• Journal of Families and Better Life
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• v.14 no.2
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• pp.61-76
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• 1996

In this study it was assumed that planning was composed of three activities -resource assessment standard setting information seeking and implementing was composed of money investment and time investment, Two variable groups which were assumed to be related with planning and implementing were household characteristics and housewife's value characteristics. Money investment to children's education was significantly affected by income, net wealth of household instrumental value of eduation and information seeking about private education. The variables assumed to affect time investment to children's education were instrumental value of education information seeking about private education and expected education level.

• Journal of Labour Economics
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• v.31 no.1
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• pp.135-162
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• 2008

This paper analyzes the impact of the mother's employment on her time investment in children's career decisions. Parental conversations with high school children and the parents' effects on children's career decisions are used as the proxies for the quantity and quality of time investment, respectively. For the empirical analysis, IV ordered-probit regressions are fitted to the KLIPS data. Other things being equal, the mother's employment does not cast any statistically significant impact on the quantity and quality of time input for children in high school. The effect of mother's employment on her time investment in children is positive for professional jobs while negative for nonprofessional jobs, but both lack the weight of statistical significance.

• Human Ecology Research
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• v.52 no.5
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• pp.443-456
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• 2014

The purpose of this study was to explore the patterns of private education, investigate the characteristics of private education patterns, and analyze the differences in study habits and academic achievement of youth on the basis of private education patterns. In this study, we used the data from the 2012 Panel of the Korea Children and Youth Panel Study by the National Youth Policy Institute. The subjects of this study were ninth-grade students and their parents. The statistical methods used for the analysis were two-step clustering, Chi-squared test, analysis of variance, and multiple regression. The major findings were as follows: first, private education was classified into three patterns, namely financial investment, time investment, and reduction of investment; and four categories, namely; private education methodology, private education time, private education expenses, and number of youth with access to private education. Second, the statistically significant socio-demographic characteristics of private education patterns were parents' education, parents' job type, father's working hours, sex of children, housing form, and income. Third, the study found that financial investment and a reduce of investment led to better study habits and academic achievement than time investment and no investment. Fourth, private education and study habits showed statistically meaningful effects on academic achievement; in particular, study habits had strong effects on academic achievement. Based on the results, a variety of educational programs for the improvement of the study habits of the youth were suggested.

• Journal of Technology Innovation
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• v.22 no.1
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• pp.1-22
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• 2014

R&D investment also has a gestation period similar to other investments in economics. The gestation period originates from time lag effect of input and output. Thus it is necessary to consider time lag effects when analyzing the relationship between firms' R&D investment and R&D performance. The main objective of this research is to estimate the length of time lag effect of R&D investment. The Almon distribution lag model was applied to estimate the time lag effect. The firm level panel dataset was established from 2002 to 2009. The net value of R&D investment and the number of patent applications were used to measure R&D input and output, respectively. This method found the estimated time lag to be 1~2 years across all datasets. The same analyses were applied to chemical, metal, electronic, exact science, and machinery industries' data. And we found there were differences among sectors in regard to the time lag effect.

• Journal of Distribution Science
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• v.14 no.8
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• pp.87-92
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• 2016

Purpose - Purpose of this paper is to review and examine FTA of two countries, Korea and China, in terms of the investment aspects in bilateral FTA. Traditionally, there have been much mutual exchanges for international trade and investment between two countries for a long time. As the FTA has established between Korea and China in recent years, it can be expected that there will be more possibilities to take wide investment opportunities, which is mutual benefit to both countries in FTA era. Research design, data, and methodology - The methodology to be taken is to look into, first general economic situations and a brief look at FTA from each countries, and then to examine investment aspects in present and future between Korea and China. Results - The result examined in this research is that each country has been involved into mutual investment step by step, and it is also revealed that investment activities have been growing steadily as time goes by. Conclusions - The FTA between Korea and China has new chance and hope for mutual co-operation in relation to investment aspects of the FTA at the level of economic exchanges, which can fully utilize national resources of each country.

• Journal of Families and Better Life
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• v.18 no.3 s.47
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• pp.115-128
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• 2000

The purpose of this study was to investigate investment behavior of mothers who have children of the lower grades in primary school and the effects of the variables. The subjects of this study were 454 mothers who have children of lower grades in primary school in Seoul. Statistics used for data analysis were frequency, mean, percentage, multiple regression. The households which paid their money for private education investment cost was 182.543 won a month and the mean of time use of mother for child education was 125 minutes a day. The most influencing variable on money investment to private education investment behavior was family income and on time investment to it was influence of reference group.

• The Journal of Korean Academy of Prosthodontics
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• v.16 no.1
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• pp.45-47
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• 1978

We use investment to retain the mould of the wax pattern in making dental metal castings. A fin on the metal casting is occasionally formed due to several factors. The factors making the fin are improper burn out time and temperature, improper W/P ratio of investment and lining of asbestos in casting ring. The purpose of this study is to investigate the effect of W/P ratio of investment on the fin formation. Except the W/P ratio of investment which used to invest the wax pattern, the study was done under same condition; burn out time and temperature, W/P ratio of refractory cast(W/P=0.12) and asbestos lining in casting ring. The obtained result is that the fin is more likely to be formed on the casting which invested with higher W/P ratio of investment to that of refractory cast.

• Management Science and Financial Engineering
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• v.22 no.1
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• pp.13-20
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• 2016

We investigate the optimal consumption and investment problem when a working debtor has an option to file for bankruptcy. By applying the duality approach, the closed-form solutions are obtained for the case of CRRA utility function. The optimal bankruptcy time is determined by the first hitting time when the financial wealth hits the wealth threshold derived from the optimal stopping time problem. Moreover, the numerical results show that the investment increases as the wealth approaches the threshold and the value gain from the bankruptcy option is vanished as wealth increases.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.14 no.24
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• pp.105-109
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• 1991

In the comparative study of investment alternatives with different life times. It is wrong to compare a long-life time alternative with different life times. It is to wrong to compare a long-life time alternative with a short-life time one by the same measure; therefore, a measure is needed which is suitable for the characters of alternatives. The purpose of this study is in present a method to evaluate investment alternatives with different life times and to explain the assumptions and calculating method.