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김태영,손원우,권태엽,강인규,김교한 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.3
The effects of electrolyte concentration and current density on the behaviour of volt-time curve of the anodizing, morphology, roughness, crystallinity and composition of the oxide layer were studied. Microstructural morphology, crystallinity, composition and surface roughness of oxide layer were analyzed by observed by scanning electron microscopy(SEM) and X-ray diffractometry(XRD), Energy-dispersive spectrometer(EDS), Electron Probe Micro Analyzer(EPMA)and roughness tester, respectively. The results of this study showed that the voltage incresed as the anodizing time increase. The growth of the oxide film developed a barrier layer to a pore-like layer with an increasing of current density, arising a spark discharge. On the morphology of anodic oxide layer the number and size of porosity was increased by increasing anodizing time at a constant concentration of electrolyte. The size of porosity and the roughness of the anodic oxide layer were increased by the increasing of concentration of electrolyte. The anodic oxide layer obtained in the conditions of this experiment was identified as anatase. The crystallinity of oxide layer was decreased by increasing the concentration of electrolyte at constant current density, and increased by the increasing current density at constant electrolyte concentration. In the EPMA analysis of anodic oxide layer, the concentration of phosphorous was increasing the electrolyte concentration and increasing the final voltage at constant electrolyte concentration, The ratio of O/Ti of the oxide layer obtained in this experiment was near 2 confirming this oxide layer was TiO₂
연세대학교 치과병원에 내원한 어린이에서의 영구치 맹출 시기 및 순서
강태성,최병재,권호근,손홍규,최형준 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.4
치아의 정확한 맹출 시기와 그 순서는 어린이의 발육 성숙도의 지표로서 소아치과 임상 및 예방 교정치료에 있어서 매우 중요하다. 이에 2001~2003년에 연세대학교 치과대학병원 소아치과에 내원한 어린이중 만 5세부터 만 14세까지의 남자 654명, 여자 542명, 총 1,196명의 자료를 수집하여 영구치의 맹출 시기 및 순서에 대한 연구 결과 다음과 같은 결론을 얻었다. 1. 상악 영구치의 맹출 시기는 중절치 남 만6.81세, 여 만6.78세, 측절치 남 만8.30세, 여 만7.98세, 견치 남 만10.28세, 여 만10.04세, 제1소구치 남 만9.74세, 여 만9.90세, 제2소구치 남 만10.87세, 여 만10.41세, 제1대구치 남 만6.25세, 여 만6.54세, 제2대구치 남 만12.21세, 여 만12.03세, 여 만12.03세였다. 2. 하악 영구치의 맹출 시기는 중절치 남 만6.00세, 여 만6.06세, 측절치 남 만6.99세, 여 만6.74세, 견치 남 만9.83세, 여 만9.17세, 제1소구치 남 만9.92세, 여 만9.75세, 제2소구치 남 만10.66세, 여 만10.39세, 제1대구치 남 만5.99세, 여 만5.75세, 제2대구치 남 만11.92세, 여 만12.17세였다. 3. 영구치의 맹출 순서는 상악에서 제1대구치, 중절치, 측절치, 제1소구치, 견치, 제2소구치, 제2대구치의 순이었고, 하악에서 제1대구치, 중절치, 측절치, 견치, 제1소구치, 제2소구치, 제2대구치의 순이었다. Accurate timing and sequence of eruption of permanent teeth are indicies of growth and essential for pediatric dentistry and pediatric clinical orthodontics. From the children brought to the Yonsei Dental Hospital during 2001 to 2003, 654 boys and 542 girls, ranging in age from five to fourteen years, were selected and analysed. The following was concluded. 1. Eruption time of maxillary teeth is 6.81 years in boys, 6.78 years in girls for central incisor, 8.30 years in boys, 7.98 years in girls for lateral incisor, 10.28 years in boys, 10.04years in girls for canine, 9.74 years in boys, 9.90 years in girls for first premolar, 10.87 years in boys, 10.41 years in girls for second premolar, 6.25 years in boys, 6.54 years in girls for first permanent molar, 12.21 years in boys, 12.03 years in girls for second permanent molar. 2. Eruption time of mandibular teeth is 6.00 years in boys, 6.06 years in girls for central incisor, 6.99 years in boys, 6.74 years in girls for lateral incisor, 9.83 years in boys, 9.17 years in girls for canine, 9.92 years in boys, 9.75 years in girls for first premolar, 10.66 years in boys, 10.39 years in girls for second premolar, 5.99 years in boys, 5.75 years in girls for first permanent molar, 11.92 years in boys, 12.17 years in girls for second permanent molar. 3. The following eruption sequence was observed: the first permanent molar erupted first, followed by the central incisor, the lateral incisor, the first premolar, the canine, the second premolar and the second permanent molar in the maxilla. The first permanent molar erupted first, followed by the central incisor, the lateral incisor, the canine, the first premolar, the second premolar and the second permanent molar in the mandible.
Kwon, Hyun-Jung,Kim, Tae-Myoung,Ryu, Jae-Myun,Son, Seung-Hwan,Hong, Jin-Tae,Jeong, Heon-Sang,Kang, Jin-Seok,Ahn, Ji-Yun,Kim, Sung-Ran,Ha, Tae-Youl,Kim, Dae-Joong The Korean Society of Food Science and Nutrition 2008 Preventive Nutrition and Food Science Vol.13 No.3
Cancer-preventive effects of ethanol extract of elm tree root (EEE) were investigated. In the in vitro cytotoxicity assay, colon cancer cells were incubated with a chloroform fraction of EEE (CF-EEE). CF-EEE significantly inhibited the proliferation of cells and induced apoptotic cell death in a dose-dependent manner. For the assessment of chemopreventive efficacy in vivo, male F344 rats were fed with EEE (0.5 or 1%) in diet for 8 weeks, and were subcutaneously injected with 1,2-dimethylhydrazine (DMH) to induce colonic aberrant crypt foci (ACF). EEE (0.5 and 1%) significantly decreased both the numbers of AC (1191.1/colon) and ACF (529.3/colon) induced by DMH. In addition, in the Western blot analysis on the colonic mucosa, administration of EEE triggered expression of caspase-3, a key factor of an apoptotic cascade. These results suggest that extract of elm tree root may have potential chemopreventive principles that lead to apoptosis of cancer cells, and thereby suppress colorectal carcinogenesis during the initiation stage.
Tae-Kwon Son,Kil-Ung Kim,Hyung-Jin Jeong,Sang-Chul Lee 한국자원식물학회 2001 Plant Resources Vol.4 No.1
Seven genetic lines of Bupleurum falcatum L. from different geographical regions were analysed for saikosaponin contents and chromosomal numbers. The somatic chromosome numbers of B. falcatum originated from Euisong, Iri, Milyang, Sangnam, Taejon, an Youngchon were 2n=20 while Mishimasaiko showed 2n=26. However, chromosome features were different in plants grown in different geographical regions. Generally, Korean lines had higher saikosaponin contents than Mishimasaiko which is Japanese and Sangnam lines had highest saikosaponin contents compared to other tested lines.
Tae Kwon Son,Jung Hee Kim,Cyren Mendoza Rico,Il Kyung Chung 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6
The effects of self-incompatibility control substance (SICS) on self-pollination, fruit set, fruit weight, and seed number of pear cultivars ‘Manpung’, ‘Wonhwang’, and ‘Niitaka’ were investigated. SICS at 1 or 2 mLㆍL?¹ was sprayed at 1 day before (BHP) or after hand pollination (AHP), BHP using reduced pollen volume (BHPR), and 1 day before (BFB), during (DFB), and 1 day after full bloom (AFB). Untreated and hand pollinated (HP) trees DFB were used as control treatments. All hand pollinations were done DFB. Simple sequence repeat (SSR) gene analysis of ‘Niitaka’ seeds was conducted to determine the effect of SICS on self-pollination. Results showed that SICS applied BHP or AHP did not induce higher fruit set than HP. Only in ‘Niitaka’, SICS at 1 mLㆍL?¹ applied BHPR induced higher fruit set than HP. All SICS at 1 or 2 mLㆍL?¹ applied BFB in ‘Manpung’, and BFB and AFB in ‘Wonhwang’ yielded higher fruit set than HP, but when applied at different blooming stages in ‘Niitaka’, no treatment induced higher fruit set than HP. SICS treated trees induced higher fruit set than untreated control, and SICS applied BHP, BFB, and DFB always performed better than that applied AHP or AFB. There was no general trend on the effects on number of seeds and fruit weight. SSR gene analysis revealed that SICS promoted self-pollination at 2 mLㆍL?¹ applied DFB and at 1 mLㆍL?¹ applied BHP.
Distribution patterns of Monochamus alternatus and M. saltuarius (Coleoptera: Cerambycidae) in Korea
Kwon, Tae-Sung,Lim, Jong-Hwan,Sim, Sang-Jun,Kwon, Young-Dae,Son, Sung-Kil,Lee, Kooi-Yong,Kim, Yeon-Tae,Park, Ji-Won,Shin, Chang-Hoon,Ryu, Seok-Bong,Lee, Chong-Kyu,Shin, Sang-Chul,Chung, Yeong-Jin,Park Korean Society of Forest Science 2006 한국산림과학회지 Vol.95 No.5
Distribution patterns of two pine sawyer species (Monochamus alternatus which is the main vector insect and M. saltuarius which is the potential insect vector of the pine wood nematode) were investigated in Korea. The data were collected at 89 study sites which were chosen to cover the whole region of South Korea. The selected pine trees were killed in early April and left for I year in the pine stands to be egg-laid by the pine sawyers. Emergence of the beetles from the dead pine trees was checked from early April to late July. M. saltuarius was the most abundant in the mid to northern areas of South Korea, whereas M. alternatus in Jeju-do, southernmost island of Korea. Considering temperature distribution patterns in areas where the two species occur, their thermal distribution boundary may be formed around $13.2^{\circ}C$ of annual mean temperature. The hypothesized distribution map of the two Monochamus species under the invasion of pine wilt disease is suggested on the base of thermal distribution of Korean peninsula.
Distribution patterns of Monochamus alternatus and M. saltuarius (Coleoptera: Cerambycidae) in Korea
Tae Sung Kwon,Jong Hwan Lim,Sang Jun Sim,Young Dae Kwon,Sung Kil Son,Kooi Yong Lee,Yeon Tae Kim,Ji Won Park,Chang Hoon Shin,Seok Bong Ryu,Chong Kyu Lee,Sang Chul Shin,Yeong Jin Chun 한국임학회 2006 한국산림과학회지 Vol.95 No.5
Total Mercury Contents of Antarctic Toothfish Dissostichus mawsoni Caught in the Antarctic Sea
Son, Kwang-Tae,Kwon, Ji-Young,Jo, Mi-Ra,Yoon, Minchul,Song, Ki-Cheol,Choi, Woo-Seok,Yeon, In-Ja,Kim, Ji-Hoe,Lee, Tae Seek The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.4
Mercury is an element of special concern for human health. Measurements of total mercury levels in fish have been taken into consideration to assess risk. In this study, the Antarctic toothfish Dissostichus mawsoni was evaluated as a potential safe food source through measurement of total mercury contents. Total mercury concentrations in Antarctic toothfish ranged from $0.101{\pm}0.047mg/kg$ to $0.139{\pm}0.075mg/kg$. The total mercury concentration was significantly correlated with macroscopic values including total fish length, weight, gonadosomatic index, and maturity (P < 0.01 or 0.05). Furthermore, according to the risk assessment, the total mercury body exposure rate from Antarctic toothfish ranged from 2.125% to 2.847% of the Provisional Tolerable Weekly Intake. Therefore, the Antarctic toothfish could be used as a potential safe seafood source.
손태권(Tae-Kwon Son),이광호(Kwang-Ho Lee),성창근(Chang-Keun Sung) 한국교원대학교 뇌기반교육연구소 2019 Brain, Digital, & Learning Vol.9 No.3
The purpose of this study is to suggest the direction of the development of the working memory assessment tool based on Baddeley(2018)’s working memory multicomponent model. To do this, we first examined the concept of working memory and neurological basis through literature review, and selected measurement factors for development of working memory assessment tool. Based on the selected measurement factors, we analyzed the developed tasks of working memory tools and revealed its characteristics and limitations. We suggest the points to be considered by the developer and the assessment tool user when developing or using the work memory assessment tool and suggested suitable tasks for each work memory measurement factors. This study is significant in that it establishes the neurological basis of working memory and suggests the points to be considered by the developers and the authors, thereby providing a basis for the development of the working memory assessment tool.