탄소나노튜브를 이용한 고강도 나노복합재료

박영수(Young Su Park),허몽영(Mong Young Huh),안계혁(Kay-hyeok An),김은성,강신재(Shinjae Kang) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11

With major causes of exhaustion and global warming of limited fossil fuel, according to policy of saveenergy and nature-friendly products, it is needed for gas milage to beb increased by compulsion regulation (Corporate Average Fuel Economy, CAFE). For this regulation solution, the diverse and hard tries such as light-weight vehicle, electric car, and fuel cell have carried out to elevate engine efficiency and to reach to a next generation zero-emission vehicle. In light-weight field, it has been tried to find or make much stronger and lighter materials or composites, magnesium alloy and carbon fiber would be a powerful candidate in metals and reinforced plastic composites for light weight vehicles. But, we here introduced carbon nanotube (CNT), which is one of the highest Young’s modulus and strength, and its nanocomposite which would be a new and powerful material to make light weight vehicle. CNT reinforced nanocomposite would solve waste disposal to make up environmental problem and have the advantage in recycling problem that would be or has been occurred in other reinforced composites.

장기간의 중강도 트레이닝이 면역기능에 미치는 영향

김주혁,장성동,김영준 東亞大學校附設스포츠科學硏究所 2001 스포츠科學硏究論文集 Vol.19 No.-

The purpose of this study was to investigate the change of immune reaction in moderate intensity training in young males. To achieve the purpose, Six healthy young males(Age:24.3±1.23yr) were recruited for this study. Exercise training consisted of a standardized 12-wk moderate intensity running program(60%HRmax, 3day/wks and 50min/day) performed in the laboratory on a computer-controlled treadmill. Pre- and post-training blood samples were obtain before and after completion of a maximal exercise test on the treadmill. The results of this was obtained as follows: In resting monocyte and eosinophil were no significantly difference between 12weeks pre- and post- running training. Monocyte and eosinophil of post maximal exercise were no significantly difference between 12weeks pre- and post- running training. NK cell were significantly increased after maximal exercise than rest. NK cell were significantly difference to rest and after maximal exercise in pre- and post- running training.

예술프로그램을 이용한 집단치료가 청소년의 인터넷/스마트폰 중독행위에 미치는 효과 : 예비연구

장혁준(Hyeok Jun Jang),김준원(Jun Won Kim),최태영(Tae Young Choi) 대한생물치료정신의학회 2017 생물치료정신의학 Vol.23 No.3

Objectives:Internet/smartphone addiction among adolescents is an increasingly problematic social issue, but with no current systematic treatment guidelines. In this study, we have evaluated the effect of a group therapy, using art program, on adolescents’ addiction to internet/smartphone. Methods:Screening tests(Young’s Internet Addiction test, YIAT ; Korean Smartphone Addiction Proneness Scale, SAPS) were performed on students from elementary and middle schools in Daegu, the Republic of Korea. Six sessions of group art therapy were conducted among 60 students, 20 showing internet/smartphone addiction(addiction group), and 40 with no addiction to the internet/smartphone(control group). Questionnaires including the sociodemographic information, Children’s Social Support Scale(SSS) scores, and Parent-Adolescent Communication Scale(PACS) scores were completed before the intervention. Clinical scales evaluating internet/smartphone addiction(YIAT, SAPS) among the participants and their psychological dispositions were also assessed before and after the intervention. Results:There were no significant differences in the sociodemographic factors between the addiction and control groups. The averages of the SSS and PACS scores were significantly higher in the control group when compared to those in the addiction group. The addiction group revealed a statistically significant decrease in the SAPS scores and a trend towards decreased YIAT scores. Both groups showed statistically significant decreases in the state anxiety and depression scores. Conclusion:Adolescents with Internet/smartphone addiction showed improvements in addictive behavior, state anxiety, and depression after group art therapy; hence, group art therapy may be considered an alternative treat-ment method for internet/smartphone addiction among adolescents.

Immobilization with Ketamine HCI and Tiletamine-Zolazepam in Cynomolgus Monkeys

Myung-cheol Kim,Sung-hyeok Hong,Soo-jin Lee,Young-suk Kim,Jae-il Lee 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

with Ketamine HCl and Tiletamine-Zolazepam in Cynomolgus MonkeysJae-il Lee, Sung-hyeok Hong, Soo-jin Lee, Young-suk Kim and Myung-cheol Kim*Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, KoreaReceived March 4, 2003 / Accepted July 2, 2003J. Vet. Sci. (2003), 4(2), 187-191JOURNAL OFVeterinaryScience*Corresponding author: Myung-cheol Kim Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Korea Tel: +82-42-821-6757, Fax: +82-42-822-4216 E-mail: mckim@cnu.ac.kr

Increased 11β-hydroxysteroid dehydrogenase type 1 contributes to barrier dysfunction in aged skin

( Beom Jun Kim ),( Noo Ri Lee ),( Chung Hyeok Lee ),( Young Bin Lee ),( Solam Lee ),( Hyun Jee Hwang ),( Eunjung Kim ),( Eung Ho Choi ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2

Background: 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) converts inactive cortisone into cortisol, an active form, and is expressed by several tissues including the skin. Excessive active glucocorticoid (GC) deteriorates skin barrier function. Objectives: To find out if 11β-HSD1 affects on the barrier function in aged skin. Methods: We have performed human and in vivo studies. We measured cortisol in stratum corneum (SC) and oral epithelium of the elderly and young. Hairless mice were used for 11β-HSD1 immunohistochemistry staining of skin and measuring skin barrier function and serum cytokines. 11β-HSD1 knock-out (KO) mice and its wild-type were used for measuring lipid synthesis related enzyme. Results: Cortisol levels were elevated in SC and oral epithelium of the elderly rather than young. The 11β -HSD1 expression was increased in immunohistochemistry stain of aged mice skin. Aged mice showed decreased transepidermal water loss (TEWL) and SC hydration, and increased SC integrity than young. Serum inflammatory cytokines including interleukin-1α, -4, -10, -31 and tumor necrosis factor-α were increased in aged mice than young. The expressions of lipid synthesis related enzymes in epidermis were elevated in KO mice and topical 11β -HSD1 inhibitor applied mice. Conclusion: 11β-HSD1 expression is elevated in aged skin. It increases active GC and then deteriorates skin barrier function.

화학-기계적 우식 제거법을 이용한 유구치 우식의 치료 : 증례보고

이혁상,이재천,김영재,김정욱,김종철,장기택 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.2

전통적인 bur에 의한 우식치질의 삭제는 진동과 열에 의한 자극을 초래하기 때문에 아이들은 치과에 가는 것을 무서워 한다. 최근 전통적인 방법을 대체하는 방법을 개발하려는 노력이 이루어져 왔고, 화학-기계적인 우식 제거법 역시 이러한 시도 중 하나이다. Carisolv^(TM)는 세가지 아미노산과 낮은 농도의 sodium hypochlorite, 그리고 특별하게 고안된 수 기구로 구성된 제품이다. 본 증례는 Carisolv^(TM)로 치료한 두 증례를 보고한다. 우식 상아질을 Carisolv^(TM) gel과 기구로 제거하고 복합레진으로 수복하였다. The conventional drilling method of caries removal makes vibration and thermal stimuli, so that children are afraid of dental treatment. Recently, various non-invasive caries removal techniques of alternatives to traditional methods are introduced and chemo-mechanical canes removal is one of them. Carisolv^(TM) comprises a gel that is composed of three different amino acids and a low concentration of sodium hypochlorite and specially-designed hand instruments. This report describes two cases of dental caries treatment with Carisolv^(TM). The carious dentin was eliminated with Carisolv^(TM) gel with instruments and then composite resin restoration was conducted.

제강Slag 충진 폐플라스틱/복합 전도성 filler 복합재료의 전자파 차폐 효과

강영구,송종혁 한국안전학회 2004 한국안전학회지 Vol.19 No.4

Electromagnetic interference(EMI) shielding characteristics of composite filled with Cu flake and carbon brush powder as hybrid conductive filler and EAF slag have been studied. The coaxial transmission line method of ASTM D4935-99 was used to measure the EMI Shielding effectiveness of composites as formulation in frequency rage 100~1,000MHz. The SE also increases with the increase in filler loading. The hybrid filler filled composites show higher SE compared to that of only Cu flake. The correlation between SE and conductivity of the various composites is also discussed. The results indicate that the composites having higher filler loading(≥40wt.%) can be used for the purpose of safety materials to protect hazardous electromagnetic interference.

中小都市의 成長要因과 特性에 관한 實證的 考察

정영동,오재화,김우혁,송승헌 朝鮮大學校 建設技術硏究所 2000 建設技術硏究 Vol.20 No.1

The study is concerned with all small and medium size cities. Study on the major purpose is to identify the domanial factors and their change for the growth of small and medium size cities through the analysis of correlation with growth rate. It could be done by case study of growth trends of all existing small and medium size cities for analysis period. The analysis results are summarized as follow : 1. Inevitably, the classification standards of the small and medium sized level in an urban hierarchy may vary among countries, depending on their pattern of urban settlement, level of development, and economic structure, population density, etc. But, the most convenient and frequently used criterion for identifying small and medium sized cities is relative population size because the city is proportional to the functional complexity. 2. The major factors affecting growth of small and medium size cities are POP, FIN, HIS, i.e., in 1986's. and the most dominant factor among them is POP, and The major factors affecting growth of small and medium sized cities are HIS, SAC, ASS, i.e., in 1996's, and the most dominant factor is HIS. 4. As the result, in small and medium size cities three variables, i.e., POP, HIS, SAC-are selected as the general factors concerned with urban population growth.

척추손상 쥐의 지방유래 줄기세포와 미노사이클린의 운동기능 회복효과

장재혁,고현윤,차영선,박형욱,신용범,손현주 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

구속된 고강도 콘크리트 기둥의 휨 거동에 관한 실험적 연구

양근혁,이영호,곽노현,정헌수 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

본 실험적 연구의 목적은 콘크리트 강도, 띠근 배근형태, 띠근 량, 축하중비가 축하증과 횡하증을 받는 구속된 콘크리트 기둥의 휨 내력과 연성에 미치는 영향을 팡가하기 위한 것이다. 구속된 기둥의 휨 거동을 시험하기 위하여 200×200×800mm 크기의 시험체 14개를 2축 하중하에서 실험하였다. 시험결과로서, 저축력에서 콘크리트 구속으로 인한 휨 강도의 증가는 비교적 작게 있지만, 고축력에서 콘크리트 구속으로 인한 휨 강도 증가는 크게 있다. 그리고, 고축력, 고강도 콘크리트에서 내부 cross-ties가 있으면 휨 연성의 증가가 보였으며, 구속된 콘크리트 기둥의 연성은 단순한 띠근 량보다는 구속지수에 관계되었다. The purpose of this experimental study was to investigate the effects of concrete strength, the configuration of lateral ties, the amount of lateral ties, and level of axial loads on flexural strength and ductility of confined of reinforced concrete columns subjected to combined axial and lateral loads. To simulate the flexural behavior of confined columns, fourteen reinforced concrete columns, 200×200×800mm, were tested under bi-axial loads. Test results indicate that for low axial load levels, the enhancement of the flexural strength due to concrete confinement is relatively small, but that for high axial load levels, the enhancement of the flexural strength due to concrete confinement can be very high. Considerable enhancement of ductility was observed in columns confined by cross-ties, even for high strength concrete columns and under high axial loads. Ductility of confined columns are found to be more related to confinement index (ρ??f??/??) than the amount of lateral ties(ρ??)