• Korean Journal of Applied Biomechanics
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• v.19 no.4
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• pp.749-759
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• 2009

The purpose of this study was to provide basic information for improving a soft tennis forehand middle volley technique based on kinematic and kinetic analyses of volleys performed by four male national tennis players($33.3{\pm}2.16$ years). The results are as follows. The first phase of the stroke was the longest, covering 64.7% of the stroke time. The displacement of the center of gravity was 48.1% to the right and 54% to the front in the first phase. When impacted, the elbow joint showed the highest average velocity, 3.67m/s, and the upper arm segment displayed the highest angular velocity, $201^{\circ}/s$. The average of the elbow angle and the ball velocity were $149^{\circ}$ and 18.9m/s, respectively. In the ground reaction force, the left and right foot forces in both the x and y directions showed a statistically significant difference. This result seems to indicate that when the left foot is pushed to the right, the force of the right foot is proportional and symmetrical to the left, serving as a supporter.

• Journal of the Korean Wood Science and Technology
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• v.19 no.4
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• pp.34-42
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• 1991

Protection of tropical forest affects on significant reduce of tropical hardwood supply, and softwood resources will be increasingly important for the timber security in Korea. U.S. softwood log was most favorite species for Korean softwood log importers in overall import conditions except price stablization and consistency of export policy. Reduced export volume from Pacific Northwest to Korean market has been immediately replenished by rediata pine from New Zealand and Chilean plantation. Siberian timber will hardly play major roles in Korean timber market unless budding structure. softwood plywood and softwood furniture uses are enhanced. Recent rapid rise of labor cost and reducing tariff rrate in Korea provided better opportunities for import lumber in building materials market. Dry dimension lumber was relatively profitable when processed from import U.S. soft-wood log while green lumber was favorable products processed from radiata pine log in Korean lumber market. This means U.S. softwood lumber would have better opportunity to market for '2${\times}$'4 studs when wood frame housing is introduced. On the other hand while radiata pine is competitive on temporary construction lumber such as supporter and concrete forming frame in Korea. Shortage of raw material for the new capacity of board plants in Korea will be it bottle neck. Major log export countries to Korea as U.S. New Zealand and Chile showed high trade intensity indices of composite hoard produces for Korean market. As Korea efforts to diversify import sources, and tariffs are reduced to 8% as scheduled by 1994. countries of scoring higher comparative advantages as Portugal. Brazil, Austria as well as New Zealand will have better opportunity to penetrate into promised Korean composites hoard market.

• Journal of Engineering Education Research
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• v.5 no.1
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• pp.50-58
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• 2002

The most important point in electronic learning(e-learning) is to gain the learning sympathy by improving interaction among the learners, instructors and operators around instruction contents. But it is necessary for the instructor to have active assistance of an administrator as a supporter and an operator because instructors do not accept all the learner's demands. So, operator's activity is very critical in success of e-learning. In this paper, wamine the theory of constructionism to effectively reflect the characteristic of WWW, and to build up a foundation of the web-based integrated e-learning circumstance. The circumstance is composed of 3 modules of the learner, instructor and the administrator. This aims to coordinate instruction functions in order to improve the effect of learning and to intensify the interaction. This paper presents the design and implementation of an e-learning system which is focused on the administrator's module to effectively support the operator's activity. As a result of this research, the system can be used in building up a variety of e-learning in university, that is, general training course and technical training course.

• Journal of Science and Technology Studies
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• v.6 no.2 s.12
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• pp.45-75
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• 2006

This study analyzed the meanings and drives, and government roles in NIS transformation process. Specifically, I deal with changes in the S&T policy and S&T public administration system as NIS changed from catch-up to post catch-up. As a result, S&T policy and administrative structure has changed as key elements of a new form of steering the transformation process. Though changed from direct to indirect, the role of the state remains strong in 'vision creation' and 'discursive coordination' as supporter and facilitator of the NIS transformation process. Especially, administration structure has been changed to strengthen decentralized pluralism and linkages and cooperation between government and private, between firms and universities, among inter related ministries.

• Journal of the Economic Geographical Society of Korea
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• v.18 no.4
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• pp.556-572
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• 2015

Since the late 1990s dualistic spatial structure has been configurated in Icheon ceramic industrial space due to the articulation of transmitted ceramics space rooted from imitating the Goryeo and Joseon ceramics and contemporary ceramics space based on academic ceramic arts. Therefore, the main purpose of this paper is to identify the formation of dualistic space in Icheon by investigating the development paths of ceramic industry in historical perspectives and analyzing inter- and extra-firm relations in Icheon. The main results of this research are as follows. Firstly, the development path of transmitted ceramics has declined gradually, while the development path of contemporary ceramics has been embedded in Icheon region. Secondly, the research pointed out that networks of transmitted ceramics and contemporary ceramics are different in the perspectives of inter-firm and extra-firm relations. Thirdly, the government has played a critical role as a financial and administrative supporter and as a network broker between university and Icheon ceramic firms(mainly with transmitted ceramics) for technological cooperation and collaborative R&D.

• The Journal of Engineering Research
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• v.2 no.1
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• pp.139-145
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• 1997

The effect of Ba addition on the thermal stabilization of $\gamma$-$Al_2O_3$ powders were studied. Ba additive was introduced into $\gamma$-$Al_2O_3$ powders by wet impregnation of $Ba(No_3)_3$.$6H_2O$. Ba additive was proved to be effective on the thermal stabilization of $\gamma$-$Al_2O_3$ powders by suppression of sintering. The optimum content of Ba was determined by 5 mol%, through the calcinations temperature range. It is suggested that the main reason of thermal stabilizaton is the substitution effect of large $Ba^{2+}$ ions into the $\Al^{3+}$ sites, which suppressed the surface diffusion of $\Al^{3+}$ ions.

• Membrane Journal
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• v.28 no.5
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• pp.361-367
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• 2018

In this study, the nanofiltration (NF) composite membranes for the low pressure use were prepared using polyvinylidene fluoride (PVDF) hollow fiber membrane as a supporter. Poly styrene sulfonic acid (PSSA) and polyethyleneimine (PEI) were coated onto the PVDF membrane by both layer-by-layer and salting-out methods. To characterize the prepared NF membranes in terms of the flux and salt rejection, 100 mg/L feed solutions of NaCl, $MgCl_2$, and $CaSO_4$ were used at the flow rate of 1 L/min and the operating pressure of 2 bar at room temperature. The NF membranes coated with 20,000 ppm PSSA (ionic strength 1.0) solution for 3 minutes and then 30,000 ppm (ionic strength 0.1) solution for 1 minute were observed the best performance. The permeability and salt rejection were 38.5 LMH, 57.1% for NaCl, 37.9 LMH and 90.2% for $MgCl_2$ and 32.4 LMH and 54.6% for $CaSO_4$, respectively.

• Research in Community and Public Health Nursing
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• v.7 no.1
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• pp.38-51
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• 1996

There is a increasingly growing emphasis on health promotion, disease prevention and optimum functioning for peaple including the chronically ill and disabled. According as the purpose of the nursing is the promotion of health, the value and belief of heal th within the nursing paradigm need to be defined in every culture. The paradigm components must be explored for meaning given by the aged in their traditional thought and philosophy, The problem addressed by this qualitative study was how the aged recognize value and belief of health, which contribute to the development of Korean nursing theory. Theoretical support for the study was from Leininger's cultural care theory and Korean philosophy and traditional oriented thought. Literature review refers to literature on the aged, health of the aged, and definition and meaning of general health concept. Grounded theory methodology guied the research methodology and analysis to build a substantive theory. The informants were 119 from a variety of social levels and family patterns; traditionally the aged are responsible for the health. The concentrated interviewing period was from may to june, 1995 ; the interviews were done by the researcher with two supporter and most were recorded on audio tape. Result from analysis of base datas follows; The value and belief of health that emerged from the categories and properties were the physical stability, the stability of mind, the stability of mind and body, the smoothness (harmony) of body function, the family concord, and the perfection of self. These values and beliefs of health are affected by the cosmic dual forces thought is based on the Great Absolute, family principle of confucian scholar, and Buddism. Among the values and beliefs of health, family concord is found out Korean culture peculiarities. These values and beliefs are all integrated into the idea of health. The study provided implications for nursing theory research, education, and practice change and development.

• Korean Journal of Childcare and Education
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• v.9 no.3
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• pp.95-119
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• 2013

The study uses a qualitative research method for an in-depth study on child care practice for preliminary child care teachers. The study shows firstly that prior to practice, a preliminary child care teacher expects to perform a dual role. The preliminary child care teacher conceives an unequal, vertical relationship with a practice guidance teacher and serves as someone between a teacher and a friend to children, while perceiving the facility head as a mediator and practice colleagues as companions. Secondly, the preliminary child care teacher performed a triple role, while the practice guidance teacher played the role of a preliminary child care teacher. A preliminary child care teacher has mutually supportive interaction with a practice guidance teacher and serves as someone between a teacher and a friend, while acting as an important supporter to the facility head and as an uncomfortable competitor to a practice colleague. Thirdly, when a practice is completed, a preliminary child care teacher feels satisfied and sorry, while emphasizing a balance between theory and practice in a curriculum. The purpose of the current study lies in figuring out the needs for child care practice for a preliminary child care teacher who is the subject in child care practice to suggest improvements for a qualitative enhancement of child care practice.

• Clean Technology
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• v.9 no.3
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• pp.125-132
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• 2003

Activity improvement of Ni metal catalysts for carbon dioxide reforming was studied using HY-zeolite as the main supporter. As the reaction temperature increased, $CH_4$ and $CO_2$ conversions increased, and conversions higher than 80% was obtained above $700^{\circ}C$. As the Ni loading increased, the catalyst activity increased, and the highest activity was shown for the Ni loading of 13wt%. The HY-zeolite support showed the highest intial conversions of $CH_4$ and $CO_2$, but it showed faster deactivation than a ${\gamma}-Al_2O_3$ support. Nevertheless, it maintained the $CH_4$conversion higher than 80% after 24 hr reaction. The effect of promoters such as Mg, Mn, K, and Ca was also studied. It was observed that the Mg promotor exhibited the highest catalyst activity and less deactivation compared with Mn, K and Ca. After 24hr reaction, The optimum Mg content was found to be 5wt%.