In order to establish a testing system for personnel dosimetry performance, the radiation fields from photons, beta particles and neutrons are required, in recent, Korea Institute of Nuclear Safety(KINS) established the reference radation fields except neutrons and tested a variety of their properties. As a result of the test, the reference beams were shown to meet satisfactorily not only the standards of the International Organization for Standardization(ISO), but also the standard levels of the developed countries which are intercomparable with the international traceability. This paper describes the reference beam of gamma radiation. The self-designed and established reference radiation fields were investigated and analyzed by ISO and other international standards. The secondary photon contribution and the beam uniformity of the gamma radiation field were measured and evaluated to fulfill those requirements suggested by the ISO-4037. The measured air kerma rate for the $^{137}$Cs and $^{60}$Co gamma fields was 0.1891 $\sim$ 23.4967 $\mu$Gy/s sand 0.5844 $\sim$ 15.9954 $\mu$Gy/s respectively. The uncertainty with 95 % confidence level of the measured air kerma rate was determined to be less than 2.5 % which is comparable to the international reference gamma radiation fields. It was found that the evaluated air kerma calibration factors of Exradin ionization chamber were in good agreement within 0.9 % and 0.03 % with those given by PTB and NIST, respectively. The gamma radiation fields installed at KINS can maintain traceability systems in Korea, Germany and United State.
Journal of The Korean Association For Science Education
/
v.24
no.3
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pp.532-543
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2004
The teacher appointment examination is consisted of a written test, an interview, a demonstration of teaching practices, one's academic record etc. The primary written test(full credit of 100) consists of multiple-choice test of general pedagogy(30%) and constructed response test of science(70%). The science test consists of science education($20{\sim}30%$) and science content($70{\sim}80%$). Five science exams were implemented for appointing general science, physics, chemistry, biology and earth science teachers in 2002 and 2003. The credits alloted to science education domain decreased from $25.7{\sim}30%$ in 2002 to $24.3{\sim}25.7%$ in 2003. The percentage of correct answer was similar between science education and science content domain in 2002, but the percentage of correct answer in science education domain(70.2%) was 29.8% higher than that of science content domain in 2003. Earth science exam almost reached the target mean score of 60 but the other four exams showed the mean scores ranging from 45.0 to 52.7 in 2002 and from 40.1 to 49.6 in 2003. The percentage of high difficulty items(p<40%) was 41.2% in physics and chemistry in 2002, 50% in physics and chemistry, and 45% in biology in 2003. Seventy eight percent of the items showed fairly high discrimination index(r>.30). In addition, the reliabilities of 5 tests were from .79 to .88. In conclusion, it is recommended that the credits alloted to science education domain should be increased up to 30%, and exam difficulties should be lowered to a proper level by making science content items easier.
A 16-week feeding trial was conducted to estimate the optimum dietary protein to energy ratio (P/E ratio, mg/kcal) in juvenile Japanese eel, Anguilla japonica. Six experimental diets were formulated with three energy levels and two protein levels at each energy level. Three energy levels of 3800, 4150 and 4500 kcal per kg diets were included at 45 and 50% crude protein (CP) levels, respectively $(_{120}P_{45},\;_{110}P_{45},\;_{100}P_{45},\;_{130}P_{50},\;_{120}P_{50},\;and\;_{110}P_{50})$. After four weeks of the conditioning period, fish initially averaging $15.0{\pm}3g\;(means{\pm}SD)$ were randomly distributed into each tank as groups of 20 fish. Each diet was fed to fish in three randomly selected tanks at a rate of $2{\sim}3%$ wet body weight per day in the recirculated system. Weight gain (WG) and specific growth rate of fish fed diet $_{100}P_{45}$ were significantly higher (P<0.05) than those of fish fed the other diets. WG of fish fed diet $_{120}P_{50}$ was also significantly higher than those of fish fed diets $_{130}P_{50}$ and $_{110}P_{50}$. Feed efficiency ratio of fish fed diets $_{100}P_{45}$ and $_{110}P_{45}$ were significantly higher (P<0.05) than those of fish fed other diets. These results suggest that the optimum P/E ratio may be 100 mg/kcal with 45% protein diets, and 120 mg/Kcal 50% protein diets for the maximum growth of juvenile Japanese eel under the experimental condition.
Journal of Dental Rehabilitation and Applied Science
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v.23
no.3
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pp.249-257
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2007
State of problem : The use of zirconium oxide all-ceramic material provides several advantages, including a high flexural strength(>1000MPa) and desirable optical properties, such as shading adaptation to the basic shades and a reduction in the layer thickness. Along with the strength of the materials, the cementation technique is also important to the clinical success of a restoration. Nevertheless, little information is available on the effect of different surface treatments on the bonding of zirconium high-crystalline ceramics and resin luting agents. Purpose : The aim of this study was to test the effects of surface treatments of zirconium on shear bond strengths between bovine teeth and a zirconia ceramic and evaluate differences among cements Material and methods : 54 sound bovine teeth extracted within a 1 months, were used. They were frozen in distilled water. These were rinsed by tap water to confirm that no granulation tissues have left. These were kept refrigerated at $4^{\circ}C$ until tested. Each tooth was placed horizontally at a plastic cylinder (diameter 20mm), and embedded in epoxy resin. Teeth were sectioned with diamond burs to expose dentin and grinded with #600 silicon carbide paper. To make sure there was no enamel left, each was observed under an optical microscope. 54 prefabricated zirconium oxide ceramic copings(Lava, 3M ESPE, USA) were assigned into 3 groups ; control, airborne-abraded with $110{\mu}m$$Al_2O_3$ and scratched with diamond burs at 4 directions. They were cemented with a seating force of 10 ㎏ per tooth, using resin luting cement(Panavia $F^{(R)}$), resin cement(Superbond $C&B^{(R)}$), and resin modified GI cement(Rely X $Luting^{(R)}$). Those were thermocycled at $5^{\circ}C$ and $55^{\circ}C$ for 5000 cycles with a 30 second dwell time, and then shear bond strength was determined in a universal test machine(Model 4200, Instron Co., Canton, USA). The crosshead speed was 1 mm/min. The result was analyzed with one-way analysis of variance(ANOVA) and the Tukey test at a significance level of P<0.05. Results : Superbond $C&B^{(R)}$ at scratching with diamond burs showed the highest shear bond strength than others (p<.05). For Panavia $F^{(R)}$, groups of scratching and sandblasting showed significantly higher shear bond strength than control group(p<.05). For Rely X $Luting^{(R)}$, only between scratching & control group, significantly different shear bond strength was observed(p<.05). Conclusion : Within the limitation of this study, Superbond $C&B^{(R)}$ showed clinically acceptable shear bond between bovine teeth & zirconia ceramics regardless of surface treatments. For the surface treatment, scratching increased shear bond strength. Increase of shear bond strength by sandblasting with $110{\mu}m$$Al_2O_3$ was not statistically different.
Kim, Young-Kyoon;Kwon, Soon-Seog;Kim, Kwan-Hyoung;Han, Ki-Don;Moon, Hwa-Sik;Song, Jeong-Sup;Park, Sung-Hak
Tuberculosis and Respiratory Diseases
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v.39
no.1
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pp.7-14
/
1992
Background: Cognitive deficit by hypoxia and/or hypercapnia is one of neuropsychological impairments frequently observed in patients with chronic obstructive pulmonary disease (COPD). The degree of cognitive deficit is variable among patients with similar level of hypoxia and/or hypercapnia, although a cause of this individual difference is well not known. COPD can be divided into two characteristic clinical entities including predominant emphysema and predominant bronchitis. This study was designed to evaluate the individual difference in cognitive deficit respond to hypoxia and/or hypercapnia in patients with COPD. Method: Sixteen patients with COPD (9 emphysema-dominant and 7 bronchitis-dominant) participated in this study. On admission arterial blood gas analysis and trail-making B (TMB) test for the evaluation of cognitive function were done in all patients. Mean TMB scores and the correlations between TMB scores and arterial blood gases were compared between two clinical groups. Results: 1) Mean TMB scores and arterial blood gases between two clinical groups were not different. 2) There was a tendency to be higher TMB score in hypoxemia, acidemia, and hypercapnia. However these findings were not statistically significant. 3) In emphysema-dominant group, $PaCO_2$ was mostly well correlated with TMB score (r=0.693). 4) In bronchitis-dominant group, arterial pH was mostly well correlated with TMB score (r=-0.526). Conclusion: Our data suggest that the individual difference in cognitive deficit respond to hypoxia and/or hypercapnia in patients with COPD may be dependent on their clinical entities, and arterial blood gases mostly well correlated with cognitive function that may be different according to their clinical entities.
Kim, Jung-Beom;Park, Yong-Bae;Kim, Ki-Cheol;Kim, Dae-Hwan;Kang, Suk-Ho;Lim, Young-Sik;Park, Po-Hyun;Yoon, Mi-Hye;Lee, Jong-Bok
Journal of the Korean Society of Food Science and Nutrition
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v.40
no.1
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pp.116-122
/
2011
This study was conducted to investigate the microbiological hazard of spoons and their cases carried by nursery school children and to evaluate the reduction effects of washing methods and ultraviolet (UV) treatments against Escherichia coli on the spoon and spoon case. A total of 78 spoons and their cases were sampled to test about total aerobic bacteria, coliform bacteria, Staphylococcus aureus, Bacillus cereus and Salmonella spp. Total aerobic bacteria were detected over 2.7 log CFU/100 $cm^2$ in 20 out of 36 spoons (55.6%), 9 out of 20 zipper-type spoon cases (45.0%) and 13 out of 22 plastic-type spoon cases (59.1%). Coliform bacteria were also detected in 19 out of 36 spoons (52.8%), 14 out of 20 zipper-type spoon cases (70.0%) and 14 out of 22 plastic-type spoon cases (63.6%). The pathogens tested in this study were not found in all samples except for the zipper-type spoon cases which were contaminated with Staph. aureus (2 samples) and B. cereus (3 samples). The results indicated that the sanitary conditions of spoons and their cases should be improved promptly. To evaluate the reduction effects of washing methods and UV treatments against E. coli, the spoons and their cases were treated at different cleaning times with and without soap, and different UV exposure times, respectively. E. coli with initial cell number of 4 log CFU on the spoons and their cases was not detected when they were cleaned at running water for 30 sec after dish sponging with soap for 30 sec. In UV treatments, E. coli with the same level of washing method was not detected after UV exposure for 15 minute in the spoons and their cases. From the results, the washing and UV treatment should be used to control the microbial contamination of spoons and their cases for more than 1 and 15 minutes, respectively.
Journal of the Korean Society of Food Science and Nutrition
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v.41
no.10
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pp.1441-1447
/
2012
This study was conducted to examine the effects of gamma irradiation on the shelf-life and sensory scores of squid Sundae under accelerated storage conditions. Squid Sundae was stored at $37^{\circ}C$ for 35 days following gamma irradiation at doses of 0, 10, and 20 kGy. For total viable cell counts, control and gamma-irradiated (GI) (10 kGy) squid Sundae were already spoiled in 4 days, whereas GI (20 kGy) squid Sundae showed complete suppression of bacterial growth during storage. There were no significant changes in pH values compared to the control. The VBN and TBARS (thiobarbituric acid reactive substance) values of GI (20 kGy) squid Sundae were significantly lower than those of the control. In addition, the induction period of GI (20 kGy) squid Sundae as measured by a Rancimat showed a higher level compared to that of the control. In the sensory evaluation, there were no significant changes between the control and GI samples. These results suggest that a dose of 20 kGy is the optimum and effective dose for preservation of squid Sundae.
The study, utilizing a data envelopment analysis (DEA) which is one of the nonparametric estimation methods, aims to evaluate the management efficiency of chestnut tree cultivators in such provinces in Chungchungnam-do as Cheong-yang, Gong-ju, Bu-yeo and so on. The analysis data of this study is based on inputs and outputs of 20 forestry households surveyed in the 2012 survey titled 'A Study on Current Level and Condition of Chestnut Cultivation and Management', which was conducted from March 2012 to October 2012. The elements of inputs are composed of management cost, harvesting cost, material cost, non-operation expenses and cultivation area, while the element of output is a gross margin only. Then the study analyzes a technical efficiency, a puretechnical efficiency and a scale efficiency using CCR and BCC model among DEA methods. Based on that, it also provides improvement methods for forestry households that turned out to be inefficient. In order to verify the result of DEA analysis, the study additionally compares a result of this efficiency study with that of chestnuts management standard diagnostic table. According to the result, the average value of technical efficiency analyzed was 0.667, proving to be inefficient in general. Given that the average value of pure-technical efficiency was 0.944 and that of scale efficiency was 0.703, it can be inferred that inefficiency exists in the field of scale, not in the field of cultivation techniques. As for forestry households with the efficiency score of 1, it is shown that there were 6 households that recorded 1 in the technical efficiency field and 13 households that recorded 1 in the pure technical efficiency. Meanwhile, there were 6 households that recorded 1 in all of the three aspects. In the comparison with the scores from chestnuts management standard diagnostic table, there were 5 households made a high score of over 80, among which are 3 households with score 1 in the technical efficiency. Also, the results of this study and the chestnuts management standard diagnostic table are proved to have the same result, both of them showing the same households that recorded the highest score and the lowest score. This means the management efficiency evaluation using DEA can be applied to the fieldwork along with the chestnuts management standard diagnostic table.
Yeom, Kyung Hun;Bing, Dong Joo;Kim, Sung Hyun;Choi, Kap Seong;Chun, Soon Sil
Journal of the Korean Society of Food Science and Nutrition
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v.46
no.1
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pp.92-99
/
2017
People have become more interested in fiber intake due to the rise of noncommunicable diseases such as hyperlipemia and abdominal obesity. This study was carried out to develop dacquoise incorporating different amounts of rice bran dietary fiber (5%, 10%, 15%, and 20%). Dacquoise characteristics such as viscosity, specific volume, moisture content, color, and texture were measured. Consumer acceptance and check-all-that-apply on characteristics of dacquoise with rice bran dietary fiber were observed. Increasing amounts of rice bran dietary fiber resulted in increasing viscosity of batter as well as higher specific volume, lightness, and hardness of finished product. On the contrary, yellowness and redness of dacquoise increased as the amount of rice bran dietary fiber increased. While there was no effect of rice bran dietary fiber on moisture content (range of 26.53~25.35%). According to the consumer acceptance test, dacquoise with 5% of rice bran dietary fiber showed the highest liking score in color and overall acceptance (5.9 and 5, respectively). The findings from the principle component analysis of principle component (PC) 1 (71.04% explanation) showed that as rice bran dietary fiber increased, texture of the product got drier, and consumers described the product with 20% rice bran dietary fiber as cotton mouth and 5% rice bran dietary fiber as sticky. PC2 (16.54% explanation) demonstrated 5% and 10% rice bran dietary fiber, and dacquoise had nutty and soybean notes while 15% and 20% rice bran dietary fiber dacquoise had flour, bitter, and salty flavors. Based on these results, the optimum addition level of rice bran dietary fiber for dacquoise is 5%.
Journal of the Korean Society of Food Science and Nutrition
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v.44
no.3
/
pp.324-330
/
2015
In this study, the anti-diabetic activity of a cold water extract of Korean mistletoe (KME) was investigated in C57BL/6J Lep ob (ob/ob) mice. Oral administration of KME (50 or 100 mg/kg/d) significantly inhibited the level of blood glucose of ob/ob mice after 5 days from the beginning of KME treatment. And the anti-diabetic effect of KME was stabilized 10 days after oral administration, showing a substantial reduction of blood glucose levels by more than 20% as compared with control mice. The results of oral glucose tolerance test (OGTT) revealed that oral administration of KME gave rise to a remarkable improvement in overall glucose response. Oral administration of KME in ob/ob diabetic mice also significantly reduced blood total cholesterol (TCHO) and triglyceride (TG) levels compared with the diabetic control mice. Moreover, in an in vitro experiment using C2C12 myotubes, treatment of KME prominently increased glucose uptake. Interestingly, KME significantly increased the expression of peroxisome proliferator-activated receptor gamma coactivator 1-${\alpha}$ ($PGC-1{\alpha}$), a head regulator of mitochondrial biogenesis and oxidative metabolism, and $PGC-1{\alpha}$-associated genes such as glucose transporter type 4 (GLUT4), estrogen-related receptor-${\alpha}$ ($ERR-{\alpha}$), nuclear respiratory factor-1 (NRF-1), and mitochondrial transcription factor A (TmfA) in C2C12 cells. These results suggest that KME has potential as a novel therapeutic agent for diabetes, and its anti-diabetic activity may be related to the regulation of mitochondrial biogenesis.
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