• Korean Journal of Child Studies
• /
• v.26 no.3
• /
• pp.141-161
• /
• 2005

The 612 4th- and 6th-grade subjects completed a self-administered questionnaire. Data were analyzed by t-test one- and two-way ANOVA, Pearson's r, and multiple regression analysis. Perceived mother's emotional abuse and neglect predicted child's depressive tendencies(DT). Abusive mothers were hostile and showed lack of concern for children's safety. Male children reported more neglect by mothers than female children. Younger mothers were more abusive. Higher maternal education was negatively related to neglect and positively related to lower DT. Mother's having a job was positively related to neglect. Mother's emotional abuse and neglect was the greatest predictor of child's self-regulation; children who experienced more emotional abuse had lower self-regulation capacity and higher DT. Self-regulation of male children was positively while that of female children was negatively correlated with age.

• Journal of Electrical Engineering and Technology
• /
• v.12 no.1
• /
• pp.145-150
• /
• 2017

This paper present a unified method of steady state performance analysis and limits characteristics of an autonomous three-phase self-excited induction generator (SEIG) driven by a wind turbine under different types of loads and speeds. The proposed method is based on a new mathematical function to solve for the real and imaginary components of the complex equation of the mathematical model. Performances limits, regulation and characteristics of different configurations will be thoroughly examined and compared. The proposed system will be modeled and simulated and the performance limits characteristics will be compared with variable speed and variable capacity.

• Journal of Distribution Science
• /
• v.14 no.3
• /
• pp.85-91
• /
• 2016

Purpose - Prior research has suggested that consumers typically prefer to have a larger number of options. However, preference of assortment size may depend on how depleted resources in consumers' mind are. Reduced capacity for self-regulation by resource depletion makes people rely on more intuitive and less effortful decision processing. When they are mentally depleted, people are likely to focus on the choice difficulty from large assortment, which leads to preference for the small assortment when they make a decision. It could be an important question potentially how being in a depleted mode through effortful self-regulation will influence on the evaluation of assortment size. To answer this questioner, we hypothesized that being engaged in self-regulation, as compared with not being engaged in self-regulation, will influence on the evaluation of product assortment size such as attractiveness, difficulty of choice, and anticipated regret. Research design, data, and methodology - In this study, we first manipulated self-regulatory resource availability using a self-regulation task (i.e., instructing participants to solve Sudoku puzzle vs. to solve diagram cube by filling any diagrams that they prefer into cube instead of number) and asked to indicate the difficulty of the tasks available to them ("How much difficulty did you feel when you complete the task?") Next, participants were asked to imagine that they were planning to buy a laptop at one of the two stores (small assortment: 6 options vs. large assortment: 30 options), both offering good quality of products. After reading the product descriptions, participants were instructed to consider all the information and choose a store that they would like to shop. Finally we measured the choice difficulty, evaluation of product assortments, and anticipated regret on a 7-point scale. We conducted two-way ANOVA in testing the main hypothesis that depleted consumers will show poorer subsequent self-control than non-depleted consumers when they make a decision in large assortment. Results - Compared with non-depleted participants, depleted participants showed the bigger difference from the degree of choice difficulty and product attractiveness between large and small assortments, but the result revealed only a significant interaction effect of resource depletion and assortment size on choice difficulty. Also depleted participants showed the smaller difference from the degree of anticipated regret between large and small assortments than non-depleted participants. Conclusion - Depleted individuals by a prior task are relatively effortless and intuitive form of choosing products so that they try to avoid making effortful trade-offs among choice difficulty such as large assortment, compare with non-depleted individuals. However, for anticipated regret, non-depleted individuals in small assortment anticipate more regret by excluding or at least restricting the possibility of buying attractive items or another kind of potential items than depleted individuals, regardless less choice difficulty in small option. To sum up, it is important to note that individuals are influenced by self-regulatory resources and their self-regulatory conditions contribute to the overall positive or negative impact of product assortment on choice.

• Korea Science and Art Forum
• /
• v.21
• /
• pp.437-449
• /
• 2015

The research aims to verify the effects of preference for science and self-directed learning ability of the science puppet show program that the researcher has developed as a STEAM education model. The results for conducting the survey with the same questionnaire before and after the program targeting the students showed that the science puppet show had effects on increasing the science related assignment performance will of the behavioral will among the three sub-dimensions including emotional respond, value cognition and behavioral will, but there was no effect on overall aspects of science preference. It can be interpreted as reflecting the characteristics of the scientific talents who already have a high level of preference for science. In addition, the three sub-dimensions including the cognitive regulation, motivational regulation and behavioral regulation had effects on the self-directed learning ability. Especially it had great effects on the directed learning ability of cognitive regulation, learning motivation of motivational regulation, tool application of behavioral regulation, and cooperation capacity which were greater for female students than male students. It is judged that the three-staged science puppet show program including the 'content integrating stage' that the students integrate the curriculum contents, 'integrated mission stage' of solving the visualization, auralization and performance missions by themselves, and 'process integration stage' of making the stage piece all together.

• Proceedings of the KIEE Conference
• /
• 2000.07a
• /
• pp.406-408
• /
• 2000

Recently, Korea's electric industry is in the midst of a period of profound changes in the structure and function, including the introduction of market competition in the generation sector. Therefore, it is difficult to promote long-term capacity planning and new generating capacity construction which have been driven by KEPCO so far, after the introduction of market competition, so new generating capacity construction and security of reserve margin is needed through self·regulation plan of private generation producers by market mechanism. According to the competition in the generation sector, a new paradigm is necessary to the long-term capacity planning driven by the Government. This paper analyzes the plan and the incentive level able to guide the new generation capacity construction considering the uncertainty risk in a period of introduction of competition. In addition, this paper analyzes the plan able to guide the new capacity construction by market function at the stage which market become established and Government's role to solve the anxiety about the capacity supply and demand.

• Molecules and Cells
• /
• v.37 no.4
• /
• pp.337-344
• /
• 2014

Adipose-derived stem cells represent a type of mesenchymal stem cells with the attendant capacity to self-renew and differentiate into multiple cell lineages. We have performed a microarray-based gene expression profiling of osteogenic differentiation and found that the transcription factor Sox11 is down-regulated during the process. Functional assays demonstrate that down-regulation of Sox11 is required for an efficient differentiation. Furthermore, results from forced expression of constitutively-active and dominant-negative derivatives of Sox11 indicate that Sox11 functions as a transcriptional activator in inhibiting osteogenesis. Sox11 thus represents a novel regulator of osteogenesis whose expression and activity can be potentially manipulated for controlled differentiation.

• Journal of Electrical Engineering and Technology
• /
• v.11 no.6
• /
• pp.1556-1570
• /
• 2016

In the process of virtual inertia control (VIC), the frequency regulation capability of the directly-driven wind turbine with permanent-magnet synchronous generator (D-PMSG) on wind farm is related to its rotor kinetic energy and capacity margin. This paper proposes the method for assessing the D-PMSG frequency regulation capability and defining its coefficient according to the operating state of wind power generators. In addition, the calculating method of parameters in VIC is also discussed according to the principles of primary frequency regulation and inertia response of synchronous generators. Then, by introducing the capability coefficient into the proportion-differential virtual inertia control (PD-VIC) for power coordination, a coordinated virtual inertia control (C-VIC) strategy is developed, with the consideration of the difference in frequency regulation capability between wind power generators. The proposed control method can not only give full play to the frequency regulation capability of wind power generators, decrease the movements of the pitch angle control system but also bring some self-coordination capability to different wind power generators thus to avoid a secondary drop in system frequency. The simulations and experiments prove the proposed method to be effective and practicable.

• The Korean Journal of Food And Nutrition
• /
• v.22 no.2
• /
• pp.313-319
• /
• 2009

To improve the growth of human mesenchymal stem cells(hMSCs) under general cell culture conditions(20% $O_2$ and 5% $CO_2$), we examined the effect of s-allylcysteine(SAC), which is known as an antioxidant and the main component of aged-garlic extract, on hydrogen peroxide-induced cellular stress in hMSCs. We found that SAC blocked hydrogen peroxideinduced cell death and cellular apoptosis, but that SAC did not improve the growth of hMSCs during short-term culture. To evaluate the protective effect of SAC, we examined the endogenous expression of the antioxidant enzymes catalase (CAT), superoxide dismutase(SOD), and glutathione peroxidase(Gpx) in hMSCs. Hydrogen peroxide was found to downregulate the expression of CAT, SOD, and Gpx at the protein level. However, in the pre-treatment group of SAC, SAC inhibited the hydrogen peroxide-induced down-regulation of CAT, SOD, and Gpx. Unfortunately, treatment with SAC alone did not induce the up-regulation of antioxidant enzymes and the cell proliferation of hMSCs. Surprisingly, SAC improved cell growth in a single cell level culture of hMSCs. These results indicate that SAC may be involved in the preservation of the self-renewal capacity of hMSCs. Taken together, SAC improves the proliferation of hMSCs via inhibition of oxidative-stress-induced cell apoptosis through regulation of antioxidant enzymes. In conclusion, SAC may be an indispensable component in an in vitro culture system of human MSCs for maintaining self-renewal and multipotent characterization of human MSCs.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2008.11a
• /
• pp.794-799
• /
• 2008

At the point of changing from the capacity qualification of temporary equipments for building to safety certification system, the meaning of qualification and the present state of main products are evaluated for Capacity qualification system and compare with related system in developed country. These suggest classification of temporary equipments for building construction in safety certification. Now, present state of the capacity qualification system is estimated; according to the reforming system from restating law in 2003, there are a lot of changing of application in every 3 years because of that. The ability of Making business is improved by checking again but, there are limitation to constantly keep the safety as the system to approve form about sent imitation products. Changing from the capacity qualification system to safely certification system make to include the structure of the qualification system and make a plan standard. It make least panic in the building market and set up some standards for capacity by changing building circumstance. The classification of temporary equipment for building construction in safety certification from the module of quotation form classify each duty quotation item, self-regulation safely verification item and option quotation item, these will more improve the system form and quality of temporary equipment for building than before.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.66 no.3
• /
• pp.486-492
• /
• 2017

In recent years, renewable energy sources have been mentioned as solution to environmental regulation and energy supply-demand. Energy storage systems are needed to mitigate the intermittent output characteristics of renewable energy sources and to operate micro grid efficiently using renewable energy generation systems. However, despite the necessity of energy storage system, this cannot secure the economical efficiency of the energy storage system by high initial cost. In this paper, a micro grid is constructed to supply electric power to industrial customers by using solar power generation system and energy storage system among renewable energy generation power sources and operated to improve energy independence. In the case study, we use photovoltaic system which is representative renewable energy generation system. Unlike conventional photovoltaic system, this system uses floating photovoltaic system with the advantage of having high output and no land area limitations. It is operated for the purpose of improving energy independence in the micro grid. In order to secure economical efficiency, the energy storage system operates a micro grid with a minimum capacity. Finally, this paper calculates the appropriate subsidy for the energy storage capacity.