• Journal of Korean Elementary Science Education
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• v.22 no.2
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• pp.211-222
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• 2003

Science has developed along with human society and history. In today's society ruled by pluralism, an educational approach using the historical materials which represent their own cultures will make science education more effective. The purpose of this study was to search for the meaning of science education related with a history of science, and to suggest the possibility for science education based on Korean history of science. The conclusions of this study is below: (1) The history of science is useful to teaching science in K-12 setting. That is because it was helpful to make a scientific concept and to invite student's interest about learning science. Moreover, it was most suitable to teach the nature of science as well as the relation between science and society. (2) A model which consists of 15 types of science education materials using Korean history was suggested. This model plays a potential role as a R&D framework of developing teaching & learning materials based on the history of Korean Science.

• Polymer(Korea)
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• v.39 no.1
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• pp.13-22
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• 2015

A new methacrylate copolymer that includes chalcone as a side group, poly(4-methacryloyloxyphenyl-4'-methoxystyryl ketone-co-styrene) was synthesized by free radical copolymerization. FTIR and $^1H$ NMR spectroscopic techniques were used to characterize the homopolymers and copolymers. The copolymerizations were carried out to high conversions. Copolymer compositions were established by $^1H$ NMR spectra analysis. The monomer reactivity ratios for copolymer system were determined by the linearized Kelen $T{\ddot{u}}d{\ddot{o}}s$, and Extended Kelen $T{\ddot{u}}d{\ddot{o}}s$ methods and a non-linear least squares method. The molecular weights and polydispersity index of copolymers were measured by using the gel permeation chromatography (GPC). The effect of copolymer compositions on their thermal behavior were studied by differential scanning calorimetry and thermogravimetric analysis methods. The optical properties of the resulting copolymer were also investigated.

• Korean Chemical Engineering Research
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• v.52 no.6
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• pp.781-788
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• 2014

Polyaniline modified graphene oxide (PANI/GO) composites were synthesized by dilute polymerization technique and were characterized by Fourier transformed infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The characterization results indicated that polyaniline molecules were successfully grafted on GO surfaces. The application of PANI/GO composites to the adsorption of heavy metals from aqueous solutions was investigated under ambient conditions. The maximum adsorption capacities of Co(II), Ni(II), Pb(II) and U(VI) ions on PANI/GO composites calculated from Langmuir models are 22.28, 25.67, 65.40 and 1552.31 mg/g, respectively. The excellent adsorption capacity suggests that PANI/GO composites can be applied as a promising adsorbent in heavy metal pollution cleanup in environmental pollution management.

• The korean journal of orthodontics
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• v.22 no.2 s.37
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• pp.289-296
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• 1992

The purpose of this study was to evaluate and compare the shear bond strengths and failure sites of metal brackets bonded with chemically cured adhesive and light-cured adhesive. 10 brackets were bonded on prepared enamel surfaces with $Transbond^{circledR}$ (Unitek/3M; U.S.A.) light-cured orthodontic adhesive and another 10 brackets were bonded with $Ortho-one^{\circledR}$ (Bisco:U.S.A.) chemically cured orthodontic adhesive. 24 hours after bonding, the Instron universal testing machine was used to measure the shear bond strengths. The failure sites were examined under streoscopic microscope. The results were as follows: 1 . The mean shear bond strength of metal brackets bonded with light-cured adhesive was lower than that of metal brackets bonded with chemically cured adhesive, but the difference was not statistically significant (p < 0.05). 2. Regardless of the type of adhesives, the brackets were failed primarily at the bracket base-adhesive interface. 3. Bonding of metal brackets with light-cured adhesive is considered to be clinically acceptable.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.6 no.1
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• pp.34-39
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• 1994

The dilution and the shore attachment of buoyant effluent into a crossflow are investigated experimentally. The effluent is produced by discharging warm water through a side channel into an open channel crossflow with the same depth to the side channel flow. Buoyancy causes the effluent to lift off the bottom, spreads across the crossflow and stays as the surface layer. The geometry of the recirculating region and the dilution of the effluent depend mainly on the buoyancy. The condition of the shore attachment can be specified by the ratios of velocities and Froude numbers.

• Journal of Gifted/Talented Education
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• v.3_4 no.1
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• pp.158-166
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• 1994

The nature of the classroom environment is an important variable to understand when fostering creativity for elementary children. Studies of the classroom climate, structure or interaction commonly depend on behavioral observations or reports from the teacher or other adult-observer. Recent studies have used self-report instruments completed by students regarding their perceptions of various aspects of their class (see Fraser, 1991). The purpose of this study was to determine the developmental differences in the ratings of classroom environment between Korean students who are gifted and their American peers. The My Class Inventory was administered to 141 elementary students in grades three, four, and five. There were 65 Korean students and 76 American students who were identified as gifted by their schools. Reliability coefficients were calculated for all scales (satisfaction = .68: friction, .67; competition = .57; cohesion = .73; difficulty = .22). Results of a multivariate analysis illustrated significant differences between students from Korea and students from America on the MCI. Univariate analysis of variance of cultural group by grade level were conducted for four of the five scales. Significant differences were found by country for the cohesion scale and by country at grade levels for the satisfaction scale. American children expressed greater satisfaction than their Korean counterparts at all grade level, but particularly at grade five. Implications for further research are discussed.

• Journal of Physiology & Pathology in Korean Medicine
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• v.22 no.4
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• pp.982-986
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• 2008

This study was performed to evaluate the oriental obese therapeutic effect with Sweet Bee Venom Mesotherapy on obese female patient of 53th years old with $Tae\bar{u}min$. We applied herbal medication, electrolipolysis, auricular acupuncture to her during 6 weeks. But, Body fat mass(Kg) and Percent Body Fat(%) was increased. After that, We treated with Sweet Bee Venom Mesotherapy on Chung-wan, Sang-wan, both Yang-mun, both $Ch'\bar{o}nch'\bar{u}$, both $Taeh\bar{o}ng$, both $Taeg\bar{o}$, both $Pokky\bar{o}l$, Kihae acupoint of abdomen during 5 weeks. We had a results of such as decreasing change of Body fat mass(Kg) and Percent Body Fat(%) with Body composition analyzer(Inbody 3.0, Biospace, Korea). And Subcutaneous Fat was decreased at all abdominal acupoints after Sweet Bee Venom Mesotherapy with Ultrasonography(LOGIQ200MD, USA). Therefore we have suggested that Sweet Bee Venom Mesotherapy have possibility to be utilized for oriental obese treatment.

• Journal of Microbiology and Biotechnology
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• v.19 no.2
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• pp.172-177
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• 2009

A gene(lsd1) encoding dextranase from Lipomyces starkeyi KSM22 has been previously cloned, sequenced, and expressed in Saccharomyces cerevisiae. The gene consisting of 1,824 base pairs and encoding a protein of 608 amino acids was then cloned into and secretively expressed in Pichia pastoris under the control of the AOX1 promoter. The dextranase productivity of the P. pastoris transformant(pPIC9K-LSD1, 134,000 U/I) was approximately 4.2-fold higher than that of the S. cerevisiae transformant(pYLSD1, 32,000 U/I) cultured in an 8-1 fermentor. Over 0.63 g/l of active dextranase was secreted into the medium after methanol induction. The dextranase of the P. pastoris transformant, as analyzed by SDS-PAGE and Western blotting, showed only one homogeneous band. This dextranase of the P. pastoris transformant showed a broad band near 73 kDa. Rabbit monoclonal antibodies against a synthetic LSD1 peptide mix also recognized approximately 73 kDa.

• Journal of the Korean Institute of Navigation
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• v.22 no.1
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• pp.63-77
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• 1998

It is one of the most important factors Seafarers Ducation Quality Assurance and Management in Higher Maritime Educational Institution. The educational process and result of Higher Maritime Educational Institution should be evaluated according to the 1995 Amendments to the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers(STCW), 1978. Actually above-mentioned evaluation is deemed to make foundation in order to enhance the efficiency of shipboard education by surveying the satisfaction of shipboard training for nautical part cadets by the group. In this paper, we carried out the questionnaire survey to study satisfactory value and the reason of dissatisfaction of 113 cadets being trained on board the Training Ship in Maritime College of Korea Maritime University(K. M. U.). The results were calculated by frequency and percentage ; the significance of difference among Department groups like Maritime Transportation Science, Maritime Police and Ship Operating Systems Engineering was analysed by $X^2$ inspection. The major results of above analysis were as follows : First training chance for dadets was very little for being overflowed on board the training ship of the K. M. U. Second, special type of Training Ship HANBADA and HANNARA made the adaptability to merchant vessel's handling restricted. Third, cadets could not manage ratings directly, therefore the education in regard to seafaring management was limited to the theoretical instruction which leads to the low level of satisfaction. And lastly, low value of satisfaction for Drydocking Education in Shipyard was caused by cadet's leaving the Training Ship on account of the safety problems including ship and cadets.

• Korean Journal of Human Ecology
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• v.9 no.2
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• pp.65-73
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• 2006

The purpose of this study is to analyze the effects of nutrition education and aerobic exercise program on weight control program of middle aged abdominal obese women. Data for the study were collected from February 14 to April 22, 2005. The study objects were 10 pre-obese women and 10 obese women. The results were as follows; Body weight, body mass index, waist-hip ratio and waist circumference of pre-obese group and obese group were significantly decreased. Nutrition education and aerobic exercise program on body weight and waist circumference were more effective in obese group than in pre-obese group. Total Cholestreol and Creatinine of pre-obese group and Total Cholestreol, Creatinine, U/A and Glucose of obese group were significantly decreased. TG(Triglyceride), BUN(Blood Urea Nitrogen), U/A(Uric Acid), Glucose, SGOT(Serum Glutamic Oxaloacetic Transaminase) and SGPT(Serum Glutamic Pyruvic Transaminase) of prer-obese group and TG, BUN, SGOT and SGPT of obese group were no differences. Obesity management program on Total Cholestreol were more effective in obese group than in pre-obese group. Therefore, it is concluded that the nutrition education and aerobic exercise program on weight control program of middle aged abdominal obese women were more effective in obese group than in pre-obese group.