• (The) Korean Journal of Educational Psychology
• /
• v.28 no.1
• /
• pp.1-21
• /
• 2014

Two studies were conducted to investigate the interactive effect between temporal proximity of utility value and self-efficacy on situational interest and reengagement motivation. In study 1, university students were provided with either proximal or distal values of mental calculation task. Hierarchical regression analyses showed a significant interaction effect between distal utility value and high self-efficacy, indicating that distal utility value was more effective to induce situational interest and reengagement motivation for students with higher level of self-efficacy. In study 2, we replicated study 1 with high school students to investigate developmental differences and found the same results. These findings suggest that it is important to consider the level of self-efficacy and proximity of utility value in designing value intervention program.

• Journal of Korean Society on Water Environment
• /
• v.37 no.3
• /
• pp.157-167
• /
• 2021

Korea needs to develop a rational system to separate stormwater utility fee from current sewerage fee. In this study, the scenario for calculating stormwater utility fee of Bupyeong-gu was suggested and the results were considered. For this purpose, the application of stormwater utility fee overseas and current domestic system were analyzed. A three step calculating scenario considering suitable domestic situation and impervious surface area was suggested. Water, sewerage usage, and hydrant data were collected. The total amount of water and sewerage fees for land use were calculated. The sewerage fee of Bupyeong-gu for the year 2014 was 21,685,446,578 won. Assuming that 40% of this amount was the cost associated to stormwater, the result showed that the fees for residential area in third step decreased by 0.77% compared to that of the first step. For commercial area, the stormwater utility fee decreased by 36.87%. For industrial area, although the consumption of water was similar to that of commercial area, the stormwater utility fee increased by 8.35%. For green area, the fee increased by 37.46%. This study demonstrated that the calculation of actual stormwater utility fee using impervious surface map and impervious Surface Ratio Estimation Methodology developed in previous studies is feasible.

• Journal of the Chungcheong Mathematical Society
• /
• v.26 no.1
• /
• pp.85-90
• /
• 2013

We use the dynamic programming method to investigate the optimal consumption and investment problem with regime-switching. We derive the optimal solutions in closed-form with constant absolute risk aversion (CARA) utility.

• Journal of applied mathematics & informatics
• /
• v.39 no.1_2
• /
• pp.215-222
• /
• 2021

We explore an optimal consumption/portfolio and retirement problem with a CARA utility function of consumption. The relevant Bellman equation for the value function is transformed into a linear equation and the optimal strategies are obtained explicitly.

• Journal of the Korean Home Economics Association
• /
• v.43 no.4 s.206
• /
• pp.17-30
• /
• 2005

The Purpose of this study was firstly to identify the living characteristics of apartment residents in relation to the behavioral patterns in the kitchen and utility space and secondly to present the basic material necessary for planning the kitchen and utility space of future desirable apartments with consideration for resident usage. The findings are summarized as follows : 1) Behavioral patterns in the kitchen and utility space were classified as personal life, family with harmony, talking with visitors, caring for children, cleaning, cooking, and keeping and connecting. 2) Behavioral patterns in He kitchen and utility space showed patterns on personal life, family with harmony, and talking with visitors and were used in the kitchen including the dining room. 3) As the required kitchen size and sink arrangement varied according to the kinds of furniture appliance, plan for the kitchen wok is very necessary.

• Korean Management Science Review
• /
• v.27 no.1
• /
• pp.45-60
• /
• 2010

This study evaluates life annuity plans based on two different types of measures : financial benefit and utility on consumption. The financial benefit is measured by Money's Worth (MW) ratio and return on annuity. For the measure of utility, an optimization problem is formulated with the objective of maximizing utility on consumption. To solve the optimization model, we use Dynamic Programming (DP) technique. The both types of measures are applied to cases of Korean pre-retirees at age 40 with different accumulation years of annuity (i.e. level of annuity asset at the age of retirement) and different timings of annuitization. Our results generally indicate that the utility based optimization model is superior to the financial measures in terms of providing a better evaluation of an annuity plan due to its capability to consider an individual's financial situation during his/her retirement period. Also, they suggest that the level of annuity asset is an important factor when an individual determines the optimal annuitization timing.

• Journal of Information Technology Applications and Management
• /
• v.15 no.4
• /
• pp.21-36
• /
• 2008

As the great disturbance from abusing credit cards in Korea becomes stabilized, credit card companies need to interpret credit-card delinquents classification models from the viewpoint of profit. However, hit ratio which has been used as a measure of goodness of classification models just tells us how much correctly they classified rather than how much profits can be obtained as a result of using classification models. In this research, we tried to develop a new utility-based measure from the viewpoint of profit and then used this new measure to analyze two classification models(Neural Networks and Decision Tree models). We found that the hit ratio of neural model is higher than that of decision tree model, but the utility value of decision tree model is higher than that of neural model. This experiment shows the importance of utility based measure for credit-card delinquents classification models. We expect this new measure will contribute to increasing profits of credit card companies.

• Proceedings of the IEEK Conference
• /
• 2002.07b
• /
• pp.1113-1116
• /
• 2002

For contents delivery systems, the service is considered in which the utility depends on each priority class. This paper deals with the multiple priority class of the contents delivery system from the viewpoint of the utility. The willingness to pay (WTP) is introduced as a measure of utility, and the optimum condition is analyzed to maximize the total user's utility. For the system with multiple priority classes, the optimum condition is given in terms of the traffic load, wating time for service for each priority class. Systems with the priority classes, 1, 2 and 3 are analyzed, and the effect of the number of priority classes is examined.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.39 no.6
• /
• pp.19-19
• /
• 2002

In this paper the authors explore the effect of bandwidth sharing to the utility of the customer for the best-effort Internet services and draw a basis for the pricing principle in Internet Protocol networks. Especially, we investigate the behavior of a customer′s utility in case an arbitrary amount of additional bandwidth is allowed to each customer for the elastic traffic, which is the typical example of the non-real time Internet data traffic. After drawing the utility curve, which will be proved to follow the concave curve, we will apply it to the pricing of Internet traffic. Finally, via numerical experiments, we will illustrate the validity and implication of the proposed method.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.39 no.6
• /
• pp.277-284
• /
• 2002

In this paper the authors explore the effect of bandwidth sharing to the utility of the customer for the best-effort Internet services and draw a basis for the pricing principle in Internet Protocol networks. Especially, we investigate the behavior of a customer's utility in case an arbitrary amount of additional bandwidth is allowed to each customer for the elastic traffic, which is the typical example of the non-real time Internet data traffic. After drawing the utility curve, which will be proved to follow the concave curve, we will apply it to the pricing of Internet traffic. Finally, via numerical experiments, we will illustrate the validity and implication of the proposed method.