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연구논문 : 중학교 과학교사들의 수업 실행 전문성 개발을 위한 교사교육 요구
최영 ( Young Choi ),이무상 ( Mu Sang Lee ),송명섭 ( Myung Seub Song ) 경북대학교 과학교육연구소 2010 科學敎育硏究誌 Vol.34 No.2
본 연구는 중학교 과학교사의 수업 실행 전문성의 개발을 위한 교사교육에 대한 요구를 조사하는데 그 목적이 있다. 최영 등의 틀(2010)을 보완하여 중학교 과학교사의 수업실행 전문성의 개발에 대한 교사교육의 요구를 조사하는 설문지를 제작하였다. 과학수업 전문성 6요소, 36관점에 대한 발달과 학습 수준, 교사교육의 필요도와 우선 요구도를 조사하였다. 대구지역 중학교 과학교사 203명의 수업 실행 전문성의 발달 수준과 학습 수준은 2.45와 3.12이었다. 발달 수준과 학습 수준 향상을 위한 교사교육의 필요도는 3.45, 3.16이었고, 교사교육의 우선 요구도가 가장 높은 요소는 `수업 계획`이었고 관점은 각각 `개인차를 고려한 계획`과 `학습 활동 계획`이었다. 교사교육의 필요도와 우선 요구도는 교사의 유형에 따라 유의미한 차이를 보였으며, 특히 경력이 적은 교사들과 지구과학 전공 교사들의 필요도와 우선 요구도가 높았다. 이상과 같은 교사교육에 대한 과학교사들의 요구는 수업 실행 전문성의 요소와 관점별로 발달 수준과 학습 수준을 향상시키는데 적합한 교사교육 프로그램 개발에 도움을 줄 것이라고 기대한다. The purpose of this study is to survey the need of in-service education for the professional development of middle school science teachers` teaching practice. The questionnaire was modified by Young Choi`s framework(2010) to survey the level of the progression in the professional development and learning, the degree of in-service education necessity, and the degree of priority of need. The questionnaire was administered to 203 middle school science teachers in Daegu. The mean level of the progression in the professional development and learning were 2.45 and 3.15. The degrees of in-service education necessity to improve level of the progression in the professional development and learning was 3.45, and 3.16. The element and aspect highest degree of priority of need were `element 1. planning coherent sequences of lessons` and `aspect 1-4. planning difference among individuals`, `aspect 1-2. planning learning activity`. The degree of in-service education necessity and the degree of priority of need was a significant difference according to almost all of the teachers` characteristics.
CHOI OK-JA,HONG YOUNG-DON,GWON HUI-JEONG,CHOI SANG-MU,CHOI SUN-JU Korean Nuclear Society 2005 Nuclear Engineering and Technology Vol.37 No.4
N-(3-bromo-2,4,6-trimethylacetanilide)iminodiacetic acid (BrTIDA) was synthesized using nitrilotriacetic anhydride prepared in situ, and lyophilized vials were prepared which contained 20 mg of BrTIDA and 0.4 mg of $SnCl_2$. To evaluate the clinical efficacy of the in-house prepared lyophilized kit, a technetium-99m complex of BrTIDA was prepared; its in vivo pharmacokinetic behavior was evaluated via animal studies to assess the hepatocytic function and the functional status of the cystic duct and the gallbladder. Serial static image scans of rabbits and the biodistribution in mice injected with $^{99m}Tc-BrTIDA$ revealed that none of the tissues except for the hepatobiliary system showed radioactivity concentrations, and a rapid clearance from the organs was observed. In conclusion, a lyophilized kit and its prepared $^{99m}Tc-BrTIDA$ can be applied as a hepatobiliary imaging agent for the evaluation of the functional status of the hepatocytes and the patency of the biliary duct.
Effect of Age at First Calving on Productive and Reproductive Performance in Dairy Cattle
Mu-Kyung Sung,Soo-Chan Lee,Jae-Kwan Jeong,In-Soo Choi,Sung-Ho Moon,,Hyun-Gu Kang,Ill-Hwa Kim 한국임상수의학회 2016 한국임상수의학회지 Vol.33 No.2
This retrospective study evaluated the effect of age at first calving on the productive and reproductive performance in Holstein dairy cattle. Data were collected on 2,297 lactations from 19 dairy farms, including dates of birth, insemination, pregnancy, calving, and lactation and milk production (305-day milk yield at first lactation and lifetime milk yield). Lactation data were grouped based on age at first calving into the early (< 24 months, n = 414), moderate (24 ≤ and ≤ 28 months, n = 1,268), and late (> 28 months, n = 615) groups. The 305-day milk yield at first lactation was higher (p < 0.005) in the late group (8,461.9 kg) than in the early (8,130.8 kg) and moderate (8,261.9 kg) groups. Lifetime days in milk were shorter (p < 0.01) in the early group (1,045.7) than in the moderate (1,143.1) and late (1,110.7) groups, whereas the lifetime milk yield was higher (p < 0.05) in the moderate group (34,171.8 kg) than in the early group (31,791.6 kg). The second calving interval (days) differed (p < 0.0001) between the early (416.9), moderate (438.9), and late (455.3) groups. The culling rate at the first and second lactations tended to be higher (p = 0.08) in the early group (31.2%) than in the moderate group (26.0%), whereas it was intermediate in the late group (29.3%). In conclusion, dairy heifers aged 24-28 months at first calving showed a higher productive performance through an increased lifetime milk yield and a decreased culling rate.
Choi, Sung Kyoung,Chun, Suwon,An, Junghwa,Lee, Mu-Yeong,Kim, Hyeon Jeong,Min, Mi-Sook,Kwon, Soo-Wan,Choi, Tae Young,Lee, Hang,Kim, Kyung Seok Genetics Society of Japan 2015 Genes & genetic systems Vol.90 No.1
<P>The long-tailed goral, Naemorhedus caudatus, is an internationally endangered species. This species is distributed throughout Northeastern Asia including Northeastern China, the Russian Far East and the Korean peninsula. The population size of long-tailed gorals is currently decreasing in South Korea, and thus effective conservation of the animal is urgently needed. Although the evolution and phylogeny of this animal have been studied, population genetic studies are needed to design effective conservation and management strategies. To evaluate the present status of genetic diversity and genetic structure of long-tailed gorals in South Korea, we investigated genetic variability among 68 goral individuals from different regions, including 11 captive zoo animals, at 12 microsatellite loci. The level of genetic diversity was moderate in wild goral populations, but lower in the captive group. The goral population from the lower northeast region of South Korea was distinct from the upper northeast population, probably due to the natural climatic and geographic conditions. The genetic characteristics of the captive group were more similar to those of the upper northeast population than the lower northeast, confirming that the zoo animals originated in the Seorak Mountain range. Direct translocations between the upper and lower northeast populations are not currently recommended considering the natural population structure and the moderate levels of genetic diversity in the two populations. This study highlights the importance of genetic information in designing effective conservation strategies and translocations of endangered animals, including the Korean goral.</P>
Choi, Jaesung,Choi, Ji-Yeob,Shin, Aesun,Lee, Sang-Ah,Lee, Kyoung-Mu,Oh, Juhwan,Park, Joo Yong,Lee, Jong-koo,Kang, Daehee Japan Epidemiological Association 2019 Journal of epidemiology Vol.29 No.4
<P><B>Background</B></P><P>We aimed to report the prevalence and correlates of high-risk alcohol consumption and types of alcoholic beverages.</P><P><B>Methods</B></P><P>The baseline data of the Health Examinees-Gem (HEXA-G) study participants, including 43,927 men and 85,897 women enrolled from 2005 through 2013, were used for analysis. Joinpoint regression was performed to estimate trends in the age-standardized prevalence of alcohol consumption. Associations of demographic and behavioral factors, perceived health-related effects, social relationships, and the diagnostic history of diseases with alcohol consumption were assessed using multinomial logistic regression.</P><P><B>Results</B></P><P>The prevalence of alcohol consumption remained higher in men during the study period and increased in women. The amount of alcohol consumed has increased in women, especially that from beer and makgeolli, a traditional Korean fermented rice wine. Older participants were less likely to be high-risk drinkers (men and women who drink more than 40 or 20 g/day of alcohol, respectively) and drink Soju, a distilled liquor, and beer, and more likely to drink makgeolli. Educational level was negatively associated with high-risk drinking. However, it was positively associated with the consumption of strong spirits and wine. Smoking was associated with high-risk drinking and the consumption of soju and strong spirits. Engaging in regular exercise and having stress were associated with drinking all types of beverages except for soju.</P><P><B>Conclusions</B></P><P>Sex-specific trends in alcohol consumption were influenced by demographic, behavioral, and perceived health-related factors. The findings will help improve the understanding of alcohol-related problems and provide evidence for establishing country-specific policies and campaigns in Korea.</P>
Choi, Baik-Dong,Lim, Do-Seon,Lee, Seung-Yeon,Nho, Tae-Hee,Jeong, Soon-Jeong,Ko, Yeong-Mu,Gang, Sung-Nam,Kim, Young-Joon,Piao, Xing-Hui,Jeong, Moon-Jin American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.2
<P>Thymosin beta 4 (T beta 4) is known to inhibit an inflammatory response and to increase the survival of osteoblasts on titanium (Ti) surfaces. Ti is the most widely used graft material in dentistry; however, an inflammatory response induced following implant placement results in the generation of reactive oxygen species (ROS). The oxidative stress from the production of ROS such as nitric oxide (NO) and hydrogen peroxide (H2O2) can damage surrounding cells, resulting in implant failure by decreasing cell viability. Thus, the aim of this study was to determine the biological effects of T beta 4 on the oxidative stress induced to MC3T3-E1 preosteoblasts on the Ti surface. Based on an MTT assay and bromodeoxyuridine immunofluorescence staining, T beta 4 was found to increase the proliferation of the H2O2-exposed MC3T3-E1 cells on Ti discs. Reverse transcription-polymerase chain reaction and western blot analyses showed that T beta 4 decreased the mRNA and protein expression levels of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in H2O2-exposed MC3T3-E1 cells on the Ti discs. T beta 4 inhibited the synthesis of intracellular ROS and the secretion of NO and prostaglandin E-2 (PGE(2)) from H2O2-exposed MC3T3-E1 cells on the Ti discs. In conclusion, T beta 4 inhibits H2O2-induced iNOS and COX-2 expression with a decrease in ROS, NO, and PGE(2) synthesis, which leads to improved cell survival with low cytotoxicity under an oxidative stress condition in MC3T3-E1 cells on the Ti surface. This suggests that T beta 4 may be a crucial molecule to reduce oxidative stress-induced cell damage or hypoxia, leading to promoted osseointegration on the Ti surface during implant placement.</P>
Preparation of <sup>99m</sup>Tc-Labeled Iron Oxide Nanoparticles for In Vivo Imaging in Hyperthermia
Park, Sang Hyun,Gwon, Hui Jeong,Choi, Sang Mu The Chemical Society of Japan 2007 Chemistry letters Vol.36 No.10
<P><SUP>99m</SUP>Tc-Labeled iron oxide nanoparticles ranging in size from 20 to 70 nm were prepared for in vivo imaging in thermotherapy called hyperthermia. The radiolabeled iron oxide nanoparticles were prepared with a high labeling efficiency (over 99%), and they also showed an excellent stability at room temperature for 6 h. This result can give a useful tool for determining the position of the nanoparticles injected into a tissue when hyperthermia treatment is applied in biomedical fields.</P>