• Bulletin of the Korean Chemical Society
• /
• v.26 no.9
• /
• pp.1369-1380
• /
• 2005

The reaction of methyl radical with iodine molecule on an attractive potential energy surface is studied by classical trajectory procedures. The reaction occurs over a wide range of impact parameters with the majority of reactive events occurring in the backward rebound region on a subpicosecond scale. A small fraction of reactive events take place in the forward hemisphere on a longer time scale. The ensemble average of reaction times is 0.36 ps. The occurrence of reactive events is strongly favored when the incident radical and the target molecule align in the neighborhood of collinear geometry. Since the rotational velocity of I2 is slow, the preferential occurrence of reactive events at the collinear configuration of $CH_3{\ldots}I{\ldots}$I leads to the reaction exhibiting an anisotropic dependence on the orientation of $I_2$. During the collision, there is a rapid flow of energy from the $H_3C{\ldots}$I interaction to the I-I bond. The $CH_3I$ translation and $H_3C$-I vibration share nearly all the energy released in the reaction, and the distribution of the vibrational energy is statistical. The reaction probability is $\cong$0.4 at the $CH_3$ and I2 temperatures maintained at 1000 K and 300 K, respectively. The probability is weakly dependent on the $CH_3\;and\;I_2$ temperatures between 300 K and 1500 K.

• Bulletin of the Korean Chemical Society
• /
• v.35 no.11
• /
• pp.3331-3335
• /
• 2014

We examine the potential use of disordered mesoporous carbon as a functional additive for confining dissolved Li-polysulfides and improving the cycling performance of Li-S batteries. To promote a better understanding of the correlation between the total pore volume of disordered mesoporous carbon and the cycling performance of Li-S batteries, a series of disordered mesoporous carbons with different total pore volumes are successfully synthesized using a commercial silica template. Based on the electrochemical and structural analyses, we suggest that the total pore volume of disordered mesoporous carbon is a predominant factor in determining its capability for either the absorption or adsorption of Li-polysulfides, which is primarily responsible for enhancing the cycling performance. The addition of disordered mesoporous carbon is also effective in enhancing the homogeneous distribution of active sulfur in the cathode, thereby affecting the cycling performance.

• Journal of Korean Elementary Science Education
• /
• v.32 no.4
• /
• pp.473-484
• /
• 2013

The purpose of this study was to develop science and art integrated program to improve the creativity of scientifically gifted elementary school students. This study was to develop science and art integrated program to enhance the creativity of these subjects. This program was consisted of 30 lessons covering 10 topics. It was developed of five stages including the observation stage reflecting the characteristics of the right hemisphere relevant to creativity, the interest and curiosity stage, the experiment design and performing stage, the internalization stage, and the stage of expressing arts. This program was applied to 20 senior gifted students in Y Elementary School in Gyeonggi province. Torrance Tests of Creative Thinking(TTCT) was used in order to investigate and measure the effectiveness of the program before and after its use in class. The results of this study are as follows: First, this program showed results of significant improvement of creativity of scientifically gifted elementary school students after its use in class(p<.05). Second, it was significantly effective in increasing their creativity, especially in the subdomains such as originality, abstractness of title, and territory of resistance on hasty conclusions after its use in class(p<.05). Third, it was significantly effective to increase the Creativity Index that represents creative potential(p<.01). In particular, emotional expression, internalized visualization, unique visualization, and richness of the imagery emerged. This study implies that the science and art integrated program was closely related to the right hemisphere of the features enabling the subjects to create new ideas, new things, and new reactions. In addition, this program is expected to contribute to activate the brain areas of creativity for gifted students in the science field.

• Journal of the Korean Home Economics Association
• /
• v.18 no.2
• /
• pp.63-68
• /
• 1980

In a rapidly changing Korean society, the role of home economics in ideological education and practical professionalism is faced to be reset. In this article the author reviews home economics and career opportunities. the following issues were discussed in detail : 1. Home Economics and Occupation ; a) As professionals in the field of home economics, job applicants must carry their message in person to potential employers. Employers must be taught that persons with home economics degrees have the capabilities and qualifications to fill a variety of positions. b) In may of 1977, Vocational Education Coalition was established by American Home economics association (AHEA), American Vocational Association, and Home Economics Education association This coalition defined the vocational education as occupation of homemaking and paid employment in home economics occupations for women and men. 2. Home Economics in business: Twelve percent of the total membership of the AHEA is affiliated with the home economics in business section. A professional management consultant, Dr. strain's viewpoint and corning Glass Work's case about business value in the home economics were summarized; a) Why a business employs a home economist. b) Why a business does not employ a home economist. c) Enhancing the home economist's value. d) Home economist's roles in corning Glass works. 3. Creating a Career: a) Mrs. Maineri's story. b) Family financial counselors. c) Home economist and displaced homemaker. d) Job opportunities in international services. Since the role of home economics in Korea has had little perception in professionalism, the following issues require immediate and serious attention to enhance career opportunities for home economists: Employers and government's recognition of home economist's value, Home economist's attitude to enhance their value, Fair employment and sex discrimination, Curricula adjustment, and Support from women's organization for employment opportunities, fair treatment, top jobs, etc.

• Journal of The Korean Association of Information Education
• /
• v.11 no.3
• /
• pp.349-358
• /
• 2007

This study is to develop a web-based career guidance system to be a help making a decision on one's occupation, which is important for a person's life. As career development education for higher grades of elementary school aims at providing basic knowledge necessary for career choice and forming a basic attitude toward occupation and values, it is desirable to carry out the guidance of a variety of occupations on the basis of personal interest and aptitude of individual students. Previously, however, most studies have remained at the level where simply test results are notified. Therefore, the study administered a career development test fit for higher grades of elementary school who are at the stage of potential career choice and developed a web-based career guidance system in which suitable occupation types are advised of based on the results. Beyond notifying test results, the developed career guidance system presents 3 excellent intelligences, rather than converting test results into scores. Thus, it is expected that the system will help students understand their areas of excellent intelligence, efficiently study related occupation types and duties, and learn to have awareness and make a better decision in relation to their career.

• Journal of The Korean Association For Science Education
• /
• v.32 no.8
• /
• pp.1356-1366
• /
• 2012

As the recent demand for human resources in science, technology, engineering, and mathematics (STEM), the development of professional STEM teacher is called worldwide. It is becoming a critical need in teacher education in order to educate student teachers, and prepare pre-service and beginning teachers for high quality of teaching competency. To promote the competency for $21^{st}$ century STEM teachers, the epistemology of technological pedagogical content knowledge (TPACK) is currently considered as the essential qualities of knowledge for highly qualified teachers. The aim of this study is explore the effect of case-based learning approach on TPACK competency of pre-service STEM teachers. In order to develop the pre-service teachers' competency regarding effective integration of technologies into teaching specific content areas, a series of innovative case study teaching in science and mathematics was presented to 43 participants of pre-service physics, chemistry, biology, mathematics, and computer teachers during a course of information and communication technology (ICT) in Education at Khon Kaen University, Thailand. After finishing a case presentation, the pre-service teachers were encouraged into a forum of critical open discussion by considering the potential impact of the case and the TPACK framework. They were investigated instructional design competency of using ICT tools into student learning process and their personal beliefs about ICT in educational process both before and after. The participant's reactions and learning was evaluated by using a self-reported questionnaire and an implementation log of content-specific learning process design, respectively. Results showed a change of their beliefs and the transformation of their TPACK competency in STEM teaching. In an effort to better serve the needs of high quality STEM teachers, the results of this study illustrated that the competency of TPACK could be particularly considered as a core attributes for future STEM teachers. By the way, case-based learning approach can play an effective part in preparing and professing the TPACK competency for STEM teachers.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.48 no.2
• /
• pp.168-177
• /
• 2015

Shell waste from the butter clam Saxidomus purpuratus and littleneck clam Ruditapes philippinarum is a large by-product of shellfish aquaculture, and it is desirable to convert it into value-added products for industrial applications. In this study, calcium carbonate (CaC) polymorphs from butter clam (BCSP) and littleneck clam (LCSP) shell powders and commercial CaC were characterized using Fourier transmission infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results revealed that the optimal calcination conditions to eliminate organic substances and improve solubility for both BCSP and LCSP were $800^{\circ}C$ for 8 h in an electrical furnace. Calcination improved the white index of the butter clam (BCCP) and littleneck clam (LCCP) calcined powder compared with shell powders. The calcium content in BCCP (51.1%) was higher than that of LCCP (44.9%) or commercial calcium oxide (CaO, 44.7%). The XRD patterns of BCCP and LCCP were similar to that of CaO. Cubic-like crystals of CaC and irregular crystals of BCCP and LCCP were observed by SEM. The FT-IR and XRD analyses revealed the presence of calcite and aragonite in the BCSP and aragonite in the LCSP, whereas the CaC contained calcite. These results indicate that butter and littleneck clam shells are potential biomass resources for calcium carbonate and calcium oxide.

• Archives of Pharmacal Research
• /
• v.29 no.12
• /
• pp.1164-1170
• /
• 2006

A triptolide-lysozyme (TP-LZM) conjugate was synthesized to achieve renal specific delivery and to reduce the side effects of triptolide. Triptolide was coupled to lysozyme through succinic via an ester bond with an average coupling degree of 1 mol triptolide per 1 mol lysozyme. The lysozyme can specifically accumulate in the proximal tubular cells of the kidney, making it a potential carrier for targeting drugs to the kidney. The structure of triptolide succinate (TPS) was confirmed by IR, $^{1}H-NMR$, MS and UV. The concentrations of triptolide in various samples were determined by reversed-phase high-performance liquid chromatography (HPLC). In this study, the physicochemical and stability profiles of TP-LZM under various conditions were investgated the stability and releasing profiles of triptolide-lysozyme (TP-LZM) under various conditions. In vitro release trails showed triptolide-lysozyme was relatively stable in plasma (less than 30% of free triptolide released) and could release triptolide quickly in lysosome (more than 80% of free triptolide released) at $37^{\circ}C$ for 24 h. In addition, the biological activities of the conjugate on normal rat kidney proximal tubular cells (NRK52E) were also tested. The conjugate can effectively reduce NO production in the medium of NRK52E induced by lipopolysaccharide (LPS) but with much lower toxicity. These studies suggest the possibility to promote curative effect and reduce its extra-renal toxicity of triptolide by TP-LZM conjugate.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.25 no.2
• /
• pp.120-133
• /
• 2018

Purpose: A meta-analysis was conducted to evaluate effectiveness of education programs using video recording and feedback in the improvement of competency in clinical skills for health care majors. Methods: Six databases were searched and inclusion criteria were randomized controlled trials (RCTs) or non-randomized controlled trials (NRTs) reporting level of skill competency using numerical measurements. Data analysis and synthesis were performed using Comprehensive Meta-Analysis software and Revman program. Results: Of 1,568 records, 11 studies met inclusion criteria. Statistically significant effectiveness of education programs using video recording and feedback was identified. A low risk of bias was detected among both RCTs and NRTs. Meta-analysis showed that the intervention groups had more effective improvements in skill competency (standardized mean difference [SMD]: 0.74; 95% CI: 0.33~1.16). Results of subgroup analysis showed higher effects when interventions dealt with one skill, used self-reflection with expert feedback, and included instruction from instructor in the education programs. Conclusion: Findings suggest that schools for health care majors should actively adopt video and feedback based skill training allowing educators to design effective programs. Potential is higher for students to achieve higher competency when they train with one skill at a time, use of instruction and receive feedback from experts.

• Journal of Technologic Dentistry
• /
• v.27 no.1
• /
• pp.131-153
• /
• 2005

The purpose of this study was to identify the accidents happened in the college dental laboratory technique classes and to realize the level of safety education for the dental laboratory technique major students. The research data were collected from a self-administered survey distributed to the conveniently selected college students whose majors were dental laboratory technology in Suwon, Daejeon, Daegu, Kimcheon, and Icsan. The study participants were 422 freshmen, sophomore and junior students in the selected cities. All collected survey responses were encoded and analyzed in SPSS 12.0. The findings were as follows. 1. The students who had any accidents in their laboratory classes were 36% and the other 64% answered 'no.' 2. Most injuries which the participants had were not significant. 3. The medical treatment periods of most injury cases were less than one week; however, approximately 20% of the self-reported injury cases reported that their treatment periods were longer than one week. 4. The body parts frequently injured from accidents were hands with 84.7% and arms, eyes, face, head, and legs in order. 5. Concerning the materials involved in the laboratory classes, most accidents happened when working with wax in 59.9%, with plaster in 52.3%, with wire in 39.8%, with alcohol in 34.6%, and casting iron in 22.2% in order. 6. The accident-prone laboratory methods were polishing with 53.5%, pickling or sanding with 17.4%, and casting or burning with 5.8% in order. 7. Most students wore their laboratory gowns well; however, few students wore mask before dust-involved jobs. Furthermore, only 57.1% students answered their laboratory fans worked during the polishing job. 8. Approximately 54% participant students answered that they took laboratory safety education when necessary only from the class instructors. 9. The 76.1% students responded that they needed laboratory safety education at least 1-2 times every semester. 10. The survey participants answered that the primary factors for injury prevention in their laboratory were taking safety education, wearing safety equipments, and providing safety-focused facilities. Concludingly, comprehensive evaluation and monitoring for potential risk factors from both the human side and the environment side should be continually provided to minimize the college laboratory accidents.