• Journal of the Korean Institute of Telematics and Electronics
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• v.10 no.3
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• pp.53-60
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• 1973

Calculations of the temperature coefficients of the elastic surface wave velocity and delay time were performed for the propagation along the X axis of rotated Y cut plane of the LiNbO3 and LiTaO3. Measurements of the temperature dependence of delay time of the elastic surface wave were also performed for the propagation along the X axis of a 130" rotated Y cut plane of the LiNb03 at the temperature range from liquid He to room temperature. Experimental value 70$\times$10-6/$^{\circ}C$ of the temperature coefficient of the delay time of the elastic surface wave agrees well with the calculated value 72.7$\times$10-a/$^{\circ}C$. The temperature coefficient of delay time of elastic surface wave propagating along the X axis of a 130$^{\circ}$ rotated Y cut plane o( the LiNbO3 is approximately 16$\times$10-6/$^{\circ}C$ at the near temperature of liquid He.d He.

• Journal of Korean Home Economics Education Association
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• v.8 no.1
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• pp.33-49
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• 1996

The objectives of this study were (1) to determine the preferences for three home economics curriculum Models(Concept-based curriculum Model, Competency-based curriculum Model, and Practical Problem-based curriculum Model) of Korean home economics(HE) teachers and HE teacher educators, (2) to determine the difference between HE teachers and HE teacher educators according to purposes of HE, focus of learning, organization of HE subject matter, focus of HE curriculum, focus of HE content, HE knowledge, main questions addressed through HE curriculum, teaching strategies, students’progress, and systems of action, and (3) to determine the relationships between preferences for three curriculum Models and personal and professional characteristics of HE teachers. Respondents in this study were 225 HE teachers and 35 HE teacher educators. The survey method was used in this descriptive study. The survey method was used in this descriptive study. The overall curriculum Model preference of each teacher respondent was determined by counting number of times a given Model among 10 identified variables. The data were analyzed by using Chi-square to compare the differences between the two groups. To determine the relationships between preferences for three curriculum Models and personal and professional characteristics of HE teachers, coefficient of contingency tables was used. Both of HE teacher group(79.4%) and HE teacher educator group(67.6%) preferred the practical problem-based curriculum Model the most. There was a difference between the two groups on preferences for the curriculum Models related to systems of action. No significant difference emerged when Chi-square was applied to determine difference between the two groups on overall preferences for three HE curriculum Model. The chi square values between preferences for three curriculum Model and level of school, type of school were statistically significant. Each contingency coefficient for level of school(middle school and high school) and form of school(private and public school) was 27, which means there is a low association between the preferences and level of school and the preferences and form of school.

• Radiation Oncology Journal
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• v.21 no.3
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• pp.222-226
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• 2003

Purpose: The interaction of the Fas: Fas ligand has been recognized to play an important role in radiation induced apoptosis. The purpose of this study was to investigate the role of Fas and Fas ligand mutations, in radiation-induced apoptosis in vivo. Materials and Methods: Mice with a mutation in the Fas ($C57BL/6J-Fas^{lpr}$) and its normal control (C57BL/6J) and the Fas ligand ($C3H/HeJ-Fas^{gld}$) and its normal control (C3H/HeJ), were used in this study. Eight-week old male mice were given whole body radiation. After irradiation, the mice were killed at various time intervals, and their spleens collected. Tissue sample was stained with hematoxylin-eosin, and the numbers of apoptotic cells scored. The regulating molecules of apoptosis including the p53, Bcl-2, Bax, $Bcl-X_L\;and\;Bcl-X_s$ genes were also analyzed by Western blotting. Results: With 2.5 Gy and 10 Gy of irradiation, the levels of apoptosis were lower in the $C57BL/6J-Fas^{lpr}\;and\;C3H/HeJ-Fas^{gld}$ mice than in the control mice (p<0.05). With the expression of apoptosis regulating molecules, the Bax was increased in both the C57BL/6J and C3H/HeJ mice in response to radiation; the peak levels of Bax in the C57BL6J and C3H/HeJ were 3 and 3.3-fold higher after 8hr, respectively. However the Bax was not increased in either the $C57BL/6J-Fas^{lpr}\;or\;C3H/HeJ-Fas^{gld}$mice. The p53, Bcl-X_L,\;Bcl-X_S$and Bcl-2 showed no significant changes in the $C57BL/6J-Fas^{lpr},\;C3H/HeJ-Fas^{gld}$, C57BL/6J and C3H/HeJ mice. Conclusion: The levels of radiation-induced apoptosis were lower in the lpr and gld, than the control mice, which seemed to be related to the level of Bax activation due to the radiation in the lpr and gld mice. This result suggests that Fas/Fas L plays an important role in radiation-induced apoptosis in vivo.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.12
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• pp.1648-1653
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• 2011

The purpose of this study was to investigate the antioxidant, nitrite scavenging, angiotensin-converting enzyme (ACE), and tyrosinase inhibition activities of ethanol extracts from Hericium erinaceus (HE) cultured in Angelica keiskei (AK) and Angelica keiskei pomace (AKP). Antioxidant activities of the HE, AK, AKP, HE+AK, and HE+AKP extracts were higher than that of control, but lower than those of BHT and Vit C. Tyrosinase inhibition activity was the highest in AKP+HE extract (90%), whereas those of HE, AK, AKP, and AK+HE extracts were about 57, 61, 82, and 78%, respectively. Nitrite scavenging abilities of various samples were above 80% at pH 1.2, and there was no significant difference between the HE, AK, AK+HE, and AKP+HE extracts at pH 3.0, excepting the AKP extract. ACE inhibition activity was the highest in AKP extract (60%), whereas those of HE, AK, AK+HE and AKP+HE extracts were about 42%, 50%, 35% and 40%, respectively. These results suggest that H. erinaceus cultured in AK and AKP may be used as a raw material for functional foods, and food additives, as well as in the cosmetic industry as a natural source of bioactive compound after further investigation in vivo.

• Journal of the Korean Society of Clothing and Textiles
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• v.20 no.5
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• pp.860-869
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• 1996

This study is a research for an idea of costume containing clothing system in the early Practical Science School. The result are described as follows 1. Bak-Kyem, Han got a critical thought and attitude to seek for practical and rational as pect. Because that he studied an original text and wanted to find a basic meaning. And the result, he made a Pang-Ryeong Symeui. 2. Hwyeng-won, Rue contended that we had to model after chinese costume system to seek for a correct clothing system to harmonize with our culture and regulation. And he sought for the original courtesy because that his basic idea of reformation in the clothing system was an ancient system. But when there was a remedy, he suggested a new system. 3. Ik, lee considered a clothing system with a critical and investigated attitude. In the clothing system, he wanted to keep an original courtesy. But he asserted a constant reformation in evil tradition. He pursued a rationality not to be tied a formality, and he had also a flexibility to recognize real customs.

• Korean Journal of Health Education and Promotion
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• v.16 no.1
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• pp.187-201
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• 1999

A purpose of this study is to provide Rousseau's health theory and health education in 『Emil』. Though Rousseau was not so much a doctor as a philosopher, he was good at health care and health education. After he had thought over healthy children for 20 years, he had written 『Emil』 for 3 years. His health theory was included in the book. He was aware of the importance of mother's milk, clothes, and physical health. Especially, he told mothers to rear a child at the breast. He understood thoroughly the demerits of medicines, and made no account of doctors and medicines. But on the other hand, He emphasized natural healing power in human body. He thought that one oneself was a physician. He thought highly of inner healing. He thought that only hygiene of medicine was useful to mankind. He prescribed that hygiene was a kind of ethics education. Therefore, his hygiene was associated with mental health and moral evaluation. Because many years have passed, today we can not accept all his assertions. But we need to stress preventive medicines, spontaneous healing, and self-care in health education.

• Biomedical Science Letters
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• v.12 no.4
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• pp.349-354
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• 2006

Induction of apoptosis allows the organism to get rid of abnormal cells and also of tumor cells. Understanding the mechanism involved in Ultraviolet radiation (UV) induced apoptosis may improve its therapeutic efficacy. In this study, we present expression of poly (ADP-ribose) polymerase (PARP) during apoptosis induced by UV in HeLa $S_3$ cells. Four different assays were performed in this study: morphological assessment of apoptotic cells and cell viability, DNA fragmentation analysis by agarose gel electrophoresis, quantitative assay of fragmented DNA, and expression of PARP by the western blot analysis. The percentages of apoptotic HeLa $S_3$ cells irradiated with $75J/m^2$ UV was increased continuously from 3 hrs incubation. DNA ladder pattern was appeared at 6 hrs. The amount of nucleosomal DNA fragments in cells treated UV increased from 3 to 12 hrs incubation and gradually decreased. The cleavage of PARP in HeLa $S_3$ cells irradiated with UV was induced, and the cleavage of PARP was more delayed in the cells pretreated with $5J/m^2$ UV and subsequently irradiated with $75J/m^2$ UV. than that in the cells only irradiated with $75J/m^2$ UV. Thus these data suggest that the cleavage of PARP relates with DNA fragmentation associated with apoptosis.

• Nuclear Engineering and Technology
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• v.31 no.5
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• pp.512-521
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• 1999

A feasibility study was performed to design an epithermal neutron beam for BNCT using the neutron of 2.45 MeV on the average produced from $^2H(d,n)^3$He reaction induced by plasma focus in the z-pinch instead of the conventional accelerator-based $^3H(d, n)^4$He neutron generator. Flux and spectrum were analyzed to use these neutrons as the neutron source for BNCT. Neutronic characteristics of several candidate materials in this neutron source were investigated Using MCNP Code, and $^7LiF$ ; 40%Al + 60%$AIF_3$, and Pb Were determined as moderator, filter, and reflector in an epithermal neutron beam design for BNCT, respectively. The skin-skull-brain ellipsoidal phantom, which consists of homogeneous regions of skin-, bone-, or brain-equivalent material, was used in order to assess the dosimetric effect in brain. An epithermal neutron beam design for BNCT was proposed by the repeated work with MCNP runs, and the dosimetric properties (AD, AR, ADDR, and Dose Components) calculated within the phantom showed that the neutron beam designed in this work is effective in tumor therapy. If the neutron source flux is high enough using the z-pinch plasma, BNCT using the neutron source produced from $^2H(d,n)^3$He reaction will be very feasible.

• The Journal of Engineering Geology
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• v.21 no.1
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• pp.65-77
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• 2011

Hydrochemical and carbon isotopic (${\delta}^{13}C_{DIC}$) analyses of 11 water samples, and noble gas isotopic analyses of 8 water samples collected in the Kyeoungbuk and Kangwon areas of Korea were performed to determine their hydrochemical characteristics and to interpret the source of noble gases and $CO_2$ gas in the water. The carbonated mineral waters are weakly acidic (PH = 5.59-6.04), and electrical conductivity ranges from 302 to $864\;{\mu}S/cm$. The chemical composition of all the water samples is Ca-$HCO_3$ type. The high contents of Fe and Mn exceed the safe limits for drinking water. The ${\delta}^{13}C_{DIC}$ values of the samples range from -5.30‰ to -2.84‰, indicating that the carbon is supplied mainly from a deep-seated source and to a lesser degree from an inorganic carbonate source. The $^3He/^4He$ ratios of the samples range from $1.51{\times}10^{-6}$ to $6.45{\times}10^{-6}$. The samples plot into three groups on a $^3He/^4He$ versus $^4He/^{20}Ne$ diagram: the deep-seated field (e.g., a mantle source), the atmospheric field, and the air-mantle mixing field. A wide range of $^4He/^{20}Ne$ ratios is observed ($0.036{\times}10^{-6}$ to $1.76{\times}10^{-6}$), indicating that while radiogenic $^4He$ is dominant in these water samples, mantle-origin He is also present. The supply of $CO_2$ gas and noble gases from a deep-seated source to carbonated waters is inferred to be controlled by geological structures such as faults and geological boundaries.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.51 no.3
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• pp.132-136
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• 2002

In this study, we analyzed the luminous efficiencies of Ne-Xe-Ar and He-Ne-Xe-Ar mixing gas in compared with those of Ne-Xe and He-Ne-Xe mixing gas to improve luminous efficiency by adding a small amount of Ar gas. At the Xe 4%, the brightness of Ne-Xe and He-Ne-Xe mixing gas is higher than others. As the Xe % increases, power consumption decreases. Thus, in the Ne-Xe and He-Ne-Xe mixing gas of Xe 4%, we obtained maxium luminous efficiency. The Ar concentration is varied from 0.1% to 0.7% in this study. The luminous efficiency of the Ne-Xe(4%) mixing gas is improved to 1.16 and 1.13 lm/W by adding an Ar concentration of 0.4% and 0.5%, respectively. The luminous efficiency of the He-Ne-Xe(4%) (He : Ne = 7 : 3) mixing gas is considerably improved by adding an Ar concentration of above 0.3%. The maximum luminous efficiency of this mixing gas is 1.38 lm/W at the condition of adding an Ar concentration of 0.5%.