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Jun‑Woo Song,Jin‑Ju Park,Gyoung‑Ja Lee,Min‑Ku Lee,Kyu‑Hyun Park,Soon‑Jik Hong,Jung Gu Lee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
The weldability window in magnetic pulse welding (MPW) is proposed for the end-closure joining of HT-9 steel tubularworkpieces. Based on both theoretical and experimental investigations, the impact velocity of the flyer tube at the momentof collision had a dominant effect on the bonding characteristics of the resultant joints and the optimal impact velocity wasestimated to be in the range of 265–290 m/s in this alloy system. Under the optimal process conditions, no leak was detectedduring helium leak testing. Moreover, the integrity of the joint interface was preserved until the tube section ruptured duringinternal pressure burst testing. For HT-9 steel, the ductile δ-ferrite phase produced by the localized interfacial melting duringMPW acted as an effective obstacle to crack propagation, thereby enhancing the fracture resistance of the joint interface. Allof the results demonstrated the high integrity and durability of the HT-9 steel tube assembly fabricated by the MPW process.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
지리산국립공원 심원계곡 생태경관 복원공사지역 식생 변화
정태준 ( Tae-jun Jung ),김연경 ( Yeon-Gyeong Kim ),김영진 ( Young-jin Kim ),정명희 ( Myung-hee Jung ),박경희 ( Kyoung-hee Park ),신창근 ( Chang-keun Shin ),박선홍 ( Seung-hong Park ),김영선 ( Young-sun Kim ) 한국환경생태학회 2021 한국환경생태학회지 Vol.35 No.3
본 연구는 지리산국립공원 심원계곡 생태경관 복원공사지역의 모니터링 결과를 분석하여 체계적인 복원관리를 도모할 수 있는 기초자료를 확보하는데 그 목적이 있다. 복원사업이 완료된 2017년도에 식생 모니터링을 위한 조사구 12개소와 대조구 4개소를 설치하였고, 2017년과 2020년의 상대우점치, 종다양도지수, 유사도 등의 변화를 분석하였다. 복원사업 시 수목이 식재되었던 조사구는 종다양도지수가 0∼1.4552로 나타났고, 대조구와의 유사도지수에서는 1개 조사구가 1.32%로 분석된 것을 제외하고 모두 0%로 나타났다. 조사구의 종다양도지수 및 유사도지수가 매우 낮은 것은 복원사업 시 식재된 수목이 고사하거나 멧돼지 피해, 유수에 의한 침식으로 유실되는 등의 영향으로 판단되었다. 반면 복원사업 시 수목이 식재되지 않은 미식재 조사구는 종다양도지수가 0.9538∼2.3222로 나타났고, 유사도지수는 최대 8.33%까지 분석되었다. 국립공원 생태경관 복원공사지역의 복원 공법 개발을 위한 장기 모니터링과, 미식재 조사구의 천이과정을 분석하는 지속적인 연구가 필요하다. This study aims to obtain basic data for systematic restoration by analyzing the monitoring results of the Shimwon Valley Ecological Landscape Restoration Project area in Jirisan National Park. In 2017, when the restoration project was completed, 12 monitoring plots and 4 control plots were installed for vegetation monitoring, and changes in the relative dominance, species diversity index and similarity between 2017 and 2020 were analyzed. The species diversity index of the surveyed areas where trees were planted during the restoration project was 0-1.4552, and the similarity index with the control group was 0% except for one survey area at 1.32%. The very low species diversity index and similarity index in the survey areas were attributed to the loss of trees planted during the restoration project due to death, damage by wild boars, or erosion by running water. On the other hand, the species diversity index was 0.9538-2.3222 in the monitoring plot where no tree was planted, and the similarity index was analyzed to be as high as 8.33%. It is necessary to continue the long-term monitoring for the development of ecological landscape restoration methods in the national park and analysis of the succession in monitoring plots where no trees were planted.
( Chihyeon Sohng ),( Jun Hong Park ),( Won Kee Lee ),( Jun Young Kim ),( Yong Hyun Jang ),( Weon Ju Lee ),( Seok-jong Lee ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2
Background: Infrared thermal imaging (ITI), aka thermography, has been used widely in medicine, but been studied rarely its clinical application in vascular malformations (VMs). Objectives: This study investigated validity and usefulness of ITI as a new screening test to differentiate between capillary malformation (CM) and arteriovenous malformation (AVM). Methods: This study included 50 patients with VMs who conducted ITI between 2011 and 2018. They were divided into two groups; CM and AVM, and those with Parkes-Weber syndrome (PWS) were also included in AVM group. Temperature difference (ΔT) between lesional and contralateral non-lesional area was compared using ITI to calculate the maximum ΔT (ΔTmax). The receiver operating characteristic (ROC) curve was then plotted to determine optimal cutoff value of ΔTmax. Results: Of the total 50 patients, 34 were finally diagnosed with CM, and 16 AVM (12 pure AVM, and 4 PWS). AVM group had significantly higher ΔTmax (2.57±1.23°C) than CM group (0.69±0.50°C).The area under the curve of ΔTmax for diagnosis of AVM versus CM was 0.938. The sensitivity and specificity were showed 87.5% and 94.1% (LR+, 14.87; LR-, 0.13) in cutoff value of ΔTmax 1.39°C, and 81.3% and 97.1% (LR+, 27.62; LR-, 0.19) in cutoff value of ΔTmax 1.42°C. Conclusion: The value of ΔTmax measured by ITI was useful to distinguish AVM from CM, so ITI can be employed as a new non-invasive differential screening test for uncertain VMs.
박은혜,박신영,전홍주 이화여자대학교 교육과학연구소 2015 교육과학연구 Vol.46 No.3
Providing activities with appropriate length is as important for young children’s learning as what is taught. In order to understand teachers' perceptions of the appropriate length of the school day, the study conducted a survey of 149 public and private kindergarten teachers in Korea. As for the length of the school day, kindergarten teachers perceived that 3 hours 16 minutes for 3 year olds, 3 hours 54 minutes for 4 year olds, and 4 hours 24 minutes for 5 year olds were appropriate. Public kindergarten teachers tended to perceive a shorter school day than private kindergarten teachers and teachers in mixed age group classes perceived a longer school day compared to the single age group teachers. Most teachers responded that 30 minutes is an appropriate length for a class period. As for the question regarding areas emphasized for each age group when organizing the curriculum according to the number of hours per lesson, the most frequent answer was to emphasize physical education and health for 3-year olds, social relationships for 4-year olds, and communication for 5-year olds. The findings of this study provide implications for including the appropriate length of the school day and hours of instruction in future curriculum revisions.
탱자(Poncirus tripoliata RAF)잎으로부터 Mitochondrial DNA의 분리
박종필,전홍성,김연순,이숙영,김성준 조선대학교 부설 유전생물공학연구소 1992 유전생물공학연구지 Vol.2 No.-
Differaitial centrifugation, sucrose(30%, 60%) and percoll(13.5%, 21% and 45%) density gradient centrifugation were used to effectively isolate mitochondria and mitochondrial DNA (mt DNA) from the leaves of the genus Poncirus (Pondrus trifoliata RAF.) The results showed that percoll density gradient centrifugation provided a convinient and effective method for the preparation of clean mitochondria. The purity of prepared mt DNA was increased by the removal of the nuclear DNA by DNase treatment to the crude mitochondrial suspension mt DNA on the agarose gel was shown extra fluorescent background in case of isolation by differential centrifugation and more cleared band included slightly smeared patterns for sucrose density gradient, and highly paint band from percoll density gradient was appeared to the best results of the above three methods. In addition to chromosomal mt DNAs, two short mt plasmid-like elements were detected in the genus Poncirus. These elements consistently co-purified with the chromosomal mt DNAs and is widely distributed among natrual Poncirus trifoliata RAF. populations. But these elements required proteinase K treatment for mobility in agarose gels.
중성자에 조사된 원자로 압력용기 재료(SA508)의 Magneto-acoustic emission 효과
홍준화,박덕근,옥치일,김장환,이종규 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.6
원자로 압력용기 재료인 SA508 steel을 온도 70 ℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 미세경도 변화와 magneto-acoustic emission(MAE) 에너지를 측정하였다. 중성자 조사에 따른 경도의 변화는 조사량이 10 /㎠까지는 거의 일정하였으나, 조사량이 10 /㎠이상에서 급격히 증가하였다. MAE 에너지의 변화는 중성자 조사량에 따라 경도의 변화와 같은 형태로 변하였으나 그 변화량은 감소하여 그변화의 추이는 경도의 변화와는 역의 형태였고, 또한 MAE에너지의 상대적 변화와 경도 변화사이에는 아주 좋은 선형성을 보였다. 이러한 결과에서 SA508 강재는 10 /㎠이상의 중성자에 조사될 경우에 재료에 중성자 조사에 의한 미세 결함이 급격히 증가하여 전위(dislocation)이동에 대한 저항성을 나타내는 마찰경화의 증가가 경도의 증가를 유발하고, 또한 이러한 미세 결함은 자기장과의 반응에서는 90°자벽의 운동중에 자기탄성 변화를 유도하여 MAE 에너지의 감소를 유발함을 알 수 있었다. 그리고 경도의 변화량보다 MAE 에너지의 변화량이 더 크게 나타나, 중성자 조사에 의한 미세결함은 기계적 성질보다 자기적 성질에 더 민감하게 반응한다는 것을 알 수 있었다.따라서 MAE가 중성자 조사에 의한 재료의 미세 구조 결함을 비파괴적인 방법으로 평가하는 강력한 도구의 가능성이 있음을 알 수 있었다. Magneto-acoustic emission (MAE) energy and hardness were measured in the reactor pressure vessel steel (SA508 Steel) for the various neutron fluence, irradiated dose up to 10 n/㎠. The hardness was nearly a constant up to 10 n/㎠, but it was rapidly increased with an increase of the neutron irradiation above 10 n/㎠. It may be considered that the increase of hardness is due to the hindrance of dislocation motion induced defect clusters by irradiation. On the other hand, the MAE energy was slowly decreased as the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation above 10 n/㎠. The decrease of the MAE energy may be considered as an increase of the defect clusters which is very sensitive to the 90°domain wall motion. Furthermore, the change of MAe energy and hardness had nearly a linear relationship, but the change of MAE energy was more significant than the change of the hardness. Therefore, MAe may be considered as a very useful technique for the nondestructive evaluation of irradiation damage.
朴泓俊 한국중국어문학회 2000 中國文學 Vol.33 No.-
在中國古典戱曲硏究者當中, 王驥德和李漁的成就已達到相當的水平. 一般認爲, 王驥德銳曲律流是總結傳統的油學, 而李漁銳瑪情偶寄首先把劇學的槪念引進了纖油界. 這樣看來, 王驪德和李漁戱曲理論的內酒, 好像是兩個不同的東西, 就是說他們追求的戮總, 一個是以曲文爲主的曲學, 男一個是以舞臺搬演爲主的劇學. 某實, 王驥德和李漁活動的時代, 只有半個世紀的差隔. 可以說, 他們在同樣的戱油環境裏生存而活動約. 所狀在上面論述的一種曲學和劇學的鮮明的對比, 可以說是太勉强的, 不符實際的. 寶際上, 王驥德和李漁都是面臨着勳曲創作案頭化的不良氣風, 而要擺脫這樣的環境而專心地努力,而樹立了一種有體系的纖曲理論著作. 在本文中, 我首先從兩人和兩個理論著作的差異出發, 而比較兩個著作的基本思路和追求. 而下面繼續從纖油舞臺, 纖油結構, 纖油資嶺的三懼側疆來比較. 從這比較當中, 我可以發琨這兩理論著作是有相當的關聯. 就是說, 王驥德<曲律>的基本思路, 從李漁的詞<情偶寄>的發揮, 達到完 整的階段. 當然, 王驥德<曲律>創拘內容是基本的思路, 而李漁的瑞情偶寄達相當有賤系的而有-定的內容深度的. 但我們不可忽略的是, 這兩理論著作的基本相關性. 如果我只是强調這兩著作的差異, 而輕視他們之間的關聯性. 那就意味着, 我們認識的片面性. 所以從兩理論著作的差異和關聯, 我們可以達到當時理論界的眞實面貌.