마그네슘 성형기술의 최근 동향

강민철,예대희,손근용 한국주조공학회 2003 한국주조공학회지 Vol.23 No.6

전동공구 내구성 평가 실험장치 개발

박근석,변영철,강이석,강배희,이동욱,차원준 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

For the endurance test, it is necessary to test the portable electric tools under the same condition as the actual operation condition. It is also essential that the test equipment is convenient to fix the tool. Those are necessary to control the loaded torque and to acquire and analyze the test data with a computer. In this study, we have developed an endurance test equipment for portable electric tools, where a hydraulic control system with a proportional relief valve was applied to control the load for the test. The developed test equipment used an industrial hydraulic pump as a load supplier to ensure a firm endurance of the test equipment itself. The data acquisition system has been automated by composing with a personal computer and RS-232C communication nets. This test equipment reduced the manhour for the test and also improved the reliability of the tested data which were measured and graphed.

중등교사임용시험 ‘생물’ 교과내용학 문항 평가내용요소별 분석 : - 2005〜2014학년도를 중심으로

안근재 오홍식 강경희 부산대학교 사범대학 과학교육연구소 2014 교사교육연구 Vol.53 No.1

The purpose of this study was to analyze problems related biology subject contents knowledge for secondary school teacher certification examination conducted from the school years 2005 to 2014. Research method was applied the quantitative method according to frequency analysis of evaluation scope and evaluation content item. The framework of analysis was based on the evaluation scope of the biology subject content knowledge and evaluation contents items. The results of analysis showed that the evaluation scope of the biology subject content knowledge and evaluation contents items were more divided than those of other subjects. There was significant difference among ratios of the contents covered in certification examination according to biology subject domains. Also the frequencies of issued the tests were showed 57% of evaluation contents items related to problems of the tests. The results of this study showed that secondary school teacher certification examination was not effective in aspect of balance of evaluation scope and evaluation content item. The results suggest the need for comprehensive reviewing about the evaluation scope of the biology subject content knowledge and evaluation contents items in the basis of trend analysis in biology subject contents knowledge for secondary school teacher certification examination. Key words: secondary school biology teacher certification examination, biology subject contents knowledge 이 연구의 목적은 2005학년도부터 2014학년도까지 중등교사임용시험의 생물 교과내용학 문항을 분석하는 것이다. 분석틀은 「생물과 교과내용학 평가 영역 및 평가 내용 요소」를 근거로 했다. 연구 방법으로는 평가영역과 평가내용요소의 빈도 분석에 따른 정량적 방법을 활용하였다. 분석 결과 생물 교과의 평가 영역과 평가 내용 요소는 타교과목에 비해 너무 세분화된 경향을 보였다. 출제 문항 분석 결과 생물과 분야별 출제비중은 큰 차이를 나타내었고, 각 평가 내용 요소별 출제 빈도도 크게 다른 것으로 나타났다. 또한 평가 내용 요소들 중 57%만이 출제문항과 연계되어 출제 내용의 편중성을 보였다. 이는 중등교사임용시험에서 생물 교과내용학 문항들이 평가영역과 평가내용요소의 균형이라는 측면에서 효과적이지 않음을 나타내고 있다. 이와 같은 결과는 향후 중등교사임용시험 생물 교과목에서 평가의 타당성을 확보하기 위해서는 출제 경향 분석을 토대로 평가 영역과 평가 내용 요소 선정에 대한 종합적인 검토가 필요함을 시사하고 있다.

Berberine의 항생제 내성 확색포도구균에 대한 항미생물 효과

김강주,차정단,김해경,유현희,유용욱,이동근 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.2

Antibiotic-resistant Staphylococcus aureus (S. aureus) emerged in many parts of the world and increased complex clinical problems. Therefore, new agents are needed to treat the antibiotic-resistant S. aureus. Some natural products are candidates of new antibiotic substances. Previous reports showed that the extract of Coptidis Rhizoma and Phellodendri Cortex have antimicrobial effects. The main antibacterial substance of Coptidis Rhizoma and Phellodendri Cortex is berberine. In this study, we examined the antimicrobial activity of berberine to antibiotic-resistant S. aureus. We isolated the 13 strains of antibiotic-resistant S. aureus from the oral cavity of healthy children in a preschool, and investigated the antimicrobial activity of berberine. We examined the effects of berberine on the level of resistance to antibiotic-resistant S. aureus. We observed that the invasion of S. aureus into human gingival fibroblasts was blocked by berberine. Berberine inhibited the growth of antibiotic-resistant S. aureus as a dosw dependent maner. Minimum inhibitory concentration (MIC) of berberine against antibiotic-resistant S. aureus was 50∼100㎍/㎖. The inhibition of S. aureus invasion was depended on the concentration of berberine in human gingival fibroblasts. The MIC of ampicillin against antibiotic-resistant S. aureus was 32㎍/㎖. However, the MIC of ampicillin against antibiotic-resistant S. aureus in the presence of 50㎍/㎖ berberine was 1㎍/㎖. These data indicate that the combination with berberine and β-lactam antibiotics resulted in the synergistic reaction. These results suggest that the berberine may have the antimicrobial activities to antibiotic-resistnat S. aureus, and the mechanism may be the inhibition of growth and intracellular invasion, and alteration of antibiotic-resistance level of antibiotic-resistant S. aureus.

Sandblasted large grit, acid etched 표면처리에 따른 교정용 미니 임플랜트의 제거회전력에 관한 연구

오남희,김성훈,국윤아,이근혜,강윤구,모성서 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.5

Sandblasted large grit, acid etched(SLA) 표면처리 된 교정용 미니 임플랜트와 평활면을 가진 교정용 미니 임플랜트 사이에 제거회전력과 조직학적 소견을 통해 표면처리된 교정용 임플랜트의 임상적 가능성에 대하여 알아보고자 하였다. 실험재료로는 길이가 9.5 mm, 외경이 1.8 mm인 custom made, screw shaped, titanium implants가 사용되었다. 미니 임플랜트는 두개의 군으로 분류되었는데 SLA군은 20개의 SLA 표면처리된 미니 임플랜트이었고, 평활면군은 크기와 형태가 같지만 SLA처리공정이 생략되어 제작된 20개의 미니 임플랜트로 구성되었다. 이들은 10마리 가토의 경골에 식립되었다. 각각의 가토의 우측 경골에는 SLA군의 미니 임플랜트 2개가 식립되었고, 좌측 경골에는 평활면군의 미니 임플랜트 2개가 식립되었다. 각 군에는 식립 직후 Ni-Ti coil spring에 의해 약 150 g의 지속적인 견인력이 주어졌다. 식립 6주 후에 10마리의 가토를 희생하였고, 안정된 상태에서 Ni-Ti coil spring을 제거하였으며 digital torque gauge를 이용하여 제거 회전력을 측정하였다. 식립 6주 후에 SLA군의 경우 (8.29 Ncm) 평활면군 (3.34 Ncm)에 비해 더 높은 평균 제거회전력을 나타내었고 조직학적 소견에서도 screw 하방에서의 신생골 형성이 관찰되었다. SLA 표면처리된 미니 임플랜트는 평활면 미니 임플랜트에 비해 좀 더 강한 교정력에 저항할 수 있을 것으로 예상되었다. Objective: The purposes of this study were to evaluate the differences between sand blasted, large grit and acid-etched (SLA) treated mini-implants and smooth surface orthodontic mini-implants in relation to the removal torque as well as the histologic analysis. Methods: Custom-made, screw-shaped, titanium implants with a length of 9.5 mm and an outer diameter of 1.8 mm were divided into 2 groups; the SLA group (20 SLA treated orthodontic mini-implants) and the smooth surface group (20 smooth surface mini-implants), and placed in the tibia metaphysis of 10 rabbits. Each rabbit had 4 mini-implants placed, 2 in each tibia. The right tibia were implanted with the SLA group mini-implants and the left tibia had the smooth group mini-implants placed. Each mini-implant group were immediately applied with a continuous traction force of 150 g using a Ni-Ti coil spring. The rabbits were sacrificed 6 weeks post-surgically. Subsequently, the legs were stabilized, the Ni-Ti coil springs were removed and the mini-implants were removed under reverse torque rotation with a digital torque gauge. Results: 6 weeks after placement, the SLA group presented a higher mean removal torque value (8.29 Ncm) than the smooth group (3.34 Ncm) and histologic analysis revealed a higher new bone formation aspect along the screw in the SLA group. Conclusion: Results of this study indicates that SLA treated mini-implants may endure higher orthodontic forces without loosening.

韓國人 學生의 腦機能 優勢(Cerebral Dominance)와 손잡이(Handedness)의 傾向

박창근,김은희,박매자,배용철,홍해숙,조희중,주강 慶北大學校 醫科大學 1990 慶北醫大誌 Vol.31 No.4

This study was investigated the effects of specialization of brain functions, the distribution of handedness and the correlation between cerebral dominance and handedness. This was surveyed with the samples of 1,302 Korean boys and girls attending in junior high school and senior high school, residing in Taegu city. In this study, Alfred W. Munzert's questionnaire and Tames Bliss & Joseph Morella's questionnaire were used as the instrument for assessing the thend of cerebral dominance and handedness. The results obtained were as follows: Out of the total number of 1,302 examined, 73.7% of them were regarded as right hemisphere dominant type and 12.6% of them were regarded as left hemisphere dominant type. In right hemisphere dominant type, students of junior high school were higher incidence than senior high School. In bilateral and left hemisphere dominant type, students of senior high school were higher incidence than junior high school. In right handers most of them were right hemisphere dominant type. In left handers, most of them were right hemisphere dominant type and the incidence of boys were higher than girls.

염색 단판을 이용한 集成 染色 무늬목 開發

안삼근,강형철,안상열,이균필,변희섭 경상대학교 농업생명과학연구원 2002 농업생명과학연구 Vol.36 No.4

본 연구는 집성 염색 무니목 개발을 위하여 사용 가능한 수종과 3종류의 염료를 사용하여 염색시간, 염색온도, 함수율 및 Flitch 제작에 대하여 연구한 결과는 다음과 같다. 실험에 사용한 4수종 중에서 선삭성이 불량한 은수원 사시나무를 제외한 3수종인 소나무와 이태리 포플러, 마티카가 사용 가능한 수종으로 밝혀졌다. Stain은 번지거나 얼룩이 지는 현상, Dylon은 침투 불균일로 부적당하였으나 Fine은 염색상태가 양호하였다. 염색시간은 5시간 이상 되어야 염색정도가 양호하였고, 염색온도는 90℃에서 가장 적당하였으며 생재와 기건재 및 포수재에 대한 영향은 큰 차이가 없었다. Flitch제작에 적당한 함수율은 9%이었다. This study was carried out to develop laminated dyeing wood, for which usable three sixties of trees and 3 kinds of dye stuffs were used to investigate dyeing time, dyeing temperature, moisture content and manufacture of flitch, the results were as follows: Out of four species of trees used in the experiment, it was found that three species, Pinus densiflora, Populus euramercana and Dyrea costulata were usable excluding Populus tomentiglandulosa whose cutting ability was bad. As to influence according to the kind of dye stuff, the Stain of low price could be used as a coloring agent but it was not proper as a dyeing agent due to spreading or staining phenomenon. As Dylon which was generally used to dye textile penetrated them uneven, dyeing only their surface, it was also found improper to be used. On the other hand, the dyed condition was good with Fine. The dyed condition was good when dyeing time was more than 5 hours and it was the most adequate when the temperature was at 90℃. There was no significant difference between their influence on green, dried and saturated wood.-In the manufacture of Flitch, the most appropriate moisture content was 9%.

원발성 조기 위 소세포암

송근영,강길,박정희,김경종,민영돈,박치영,임성철 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2

Gastric small cell carcinoma(SCC) is defined as poorly-differentiated neuroendocrine tumor of the stomach, and their morphologic and biologic features arc similar to those of the lung. It is known that this tumor has poor prognosis even in early pathologic stage, It acounts for only 3% of all gastrointestinal SCC. that has been reported only 33 cases outside and 6 cases inside of the comitiy. Most of these reports are related to advanced gastric SCC. as pathologic stage IIIb or IV. This report describes a case of early gastric SCC. pathologic stage Ib.

쥐노래미 Hexagrammos otakii의 난소 발달단계에 따른 간세포의 활성변화

정의영,강희웅,이근우 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.2

암컷 쥐노래미(Hexagrammos otakii)의 생식소중량지수(GSI)는 9월에 증가되기 시작하여 11월에 최대에 도달하였다. 쥐노래미의 생식주기는 연속적인 5단계로 나눌 수 있었다: 성장전기(7월), 성장후기(7~8월), 성숙기(9~10월), 완숙 및 산란기(9~12월), 회복 및 휴지기(12~6월). 간중량지수(HSI)의 월변화는 GSI변화와 유사한 경향을 보였다. 성장전기에 다량의 지방적과 글리코겐 입자들이 간세포내에 존재하였다. 특히, 이 시기에 간세포는 헤마톡실린에 약하게 염색되었다. 성장후기부터 성숙기에 간세포의 크기는 증대되었으며 간세포질내 글리코겐과 지방적들의 양은 감소된 반면, 호염기성 물질 축적이 증가하였다. 산란기부터 회복 및 휴지기에는 간세포내에 호염기성 물질 축적이 감소된 반면, 다량의 지방적과 글리코겐입자가 축적되었다. 간세포내의 총단백질, 총지질 및 글리코겐함량(%)의 최대값은 각각 9월(성숙기), 7월(성장전기), 3월(휴지기)에 나타났다. The GSI in the female greenling Hexagrammos otakii, began to increase in September and reached a maximum in November. The reproductive cycle of the greenling can be divided into five successive stage: early-growing stage(July), late- growing stage(July to August), mature stage(September to October), ripe-and-spent stages(September to December), and recovery-and-resting stages(December to June). Monthly changes in the HSI showed a similar pattern with those of the GSI. In the early- growing stage, a lot of lipid droplets, and glycogen particles were present in the cytoplasm of hepatocytes. Especially, the cytoplasm of hepatocytes were weakly stained with hematoxylin. In the late- growing to mature stage, hepatocytes became large, and the amount of glycogen and lipid droplets in hepatocytes gradually decreased, while basophilic substance increased. In the spawning to recovery-and-resting stages, basophilic substances decreased in the cytoplasm of hepatocytes. However, lots of lipid droplets and glycogen were stored in the hepatocytes. The maxium total protein, lipid and glycogen contents(%) in the hepatocytes appeared in September(mature stage), July(early-growing stage) and March(resting stage), respectively.

[PA-0019] Investigating salt tolerance in cowpea germplasm using genome-wide association study

Byeong Hee Kang(Byeong Hee Kang),Woon Ji Kim(Woon Ji Kim),Chang Yeok Moon(Chang Yeok Moon),Sehee Kang(Sehee Kang),Bo-Keun Ha(Bo-Keun Ha) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-