악성 종양을 지닌 환자의 복수에서의 염색체 분석

류승완,정기용,김대광 대한해부학회 1999 Anatomy & Cell Biology Vol.32 No.5

[논문]스트렷-타이 모델에 의한 사각형 단면 코벨의 설계 기법

김대성,김태완,이승훈,엄장섭,진치섭 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

콘크리트 코벨은 D-영역을 갖는 대표적인 구조물로서 복잡하고 다양한 형상의 파괴메커니즘을 보인다. 이는 응력집중과 기하학적인 불연속으로 일반적인 보 이론의 적용이 불가능하여 해석 및 설계에 어려움이 많다. 본 연구에서는 지압파괴,압축파괴 및 전단파괴를 유발하는 복잡한 파괴메커니즘을 형성하고 있는 사각형 단면 코벨의 거동 및 파괴형상을 예측하고 스트릿-타이 모텔을 적용하여 해석 및 설계를 하였다. 또한 현행의 설계방법과의 비교를 통하여 스트렷-타이 모델이 보다 합리적이고 경제적인 설계방법임을 보였다.

카본블랙의 종류와 충전량이 NR Compound 의 동적 점탄성에 미치는 영향

김완영,이대수,김윤섭 全北大學校 1990 論文集 Vol.32 No.-

Bound rubber formation of NR(natural rubber) compound containing various carbon blacks was increased as I_2 absorption number or DBPA (dibutylphthalate absorption) value was increased. The increases of surface area of carbon black resulted in increases of heat build-up and tan δ at 60℃ but decreases of rebound property and wear loss of NR compound. It is speculated that more damping at the interface of carbon black and rubber occurs in the presence of carbon black of high surface area. Increasing the loading level of carbon black N220 in NR compound resulted in the acceleration of cure rate. Tensile strength, elongation at break, wear loss and rebound property were found to decrease but heat buildup and tan δ at 60℃ to increase with the content of carbon black. Therefore, it is concluded that increasing the loading level of carbon black may affects rolling resistance of tires adversely.

크랙 영상처리 알고리즘에 관한 연구

류대현,최태완 진주산업대학교 2000 論文集 Vol.39 No.-

In this paper, we developed crack image detection methods to measure growing behavior of fatigue-crack using digital image processing system and Visual C++ in personal computer. If the proposed method is used to develop the crack monitoring system and observe the crack growing behavior automatically, the time and efforts for fatigue test could be dramatically reduced. And also it is possible to estimate and manage efficiently the safety and lifetime of industrial facilities based on the collected data.

Thiamine 誘導體의 摘出腸管에의 吸收에 관하여

李琬夏,柳柄泰,智雄吉,朴大圭 成均館大學校 1980 論文集 Vol.27 No.-

Thiamine-HCI, Thiamine Propyl Disulfide (TPD) and Thiamine Tetrahydrofur furyl Disulfide (TTFD) were studied to stability in artifcial gastric juice and artificial pancreatic juice. And in the in vitro isolated intestine of rabbit, absorption rate of this compounds were examined. The results were as follows. 1. The stability of this compounds in artificial gastric juice and artificial panereatic juice were stable. 2. In the in vitro isolated intestine of rabbit, absorption rate of TPD was increased than that of thiamine-HCI about 20% after 120 minutes. And absorption rate of TTFD was much the same in the case of thiamine-HCI.

自動倉庫와 保管品의 最適配置에 관한 硏究

李相玩,申大赫,兪炳哲 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1

This paper deal with the concept of AS/RS and the closest available location is AS/RS. Travel-time model and minimum cost model have developed for automated storage/retrieval machine. In this article, it is shown that arrival loads follow Poisson process and duration times are independent of each other and have i. i. d. distribution. The objective of this study is mainly compare with existing research and propose new approach method to optimal location. We give approximate method for the K closest location.

Streptococcus mutans의 우식 활성에 미치는 Propolis의 효과

송완엽,백병주,주훈,김대범,송요한 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1

Propolis, a natural resinous product collected by honey bees, is known to exhibit various biological activities including anti-microbial, anti-inflammatory, and anti-tumor activities. The present study was designed to investigate the effects of ethanol extracted propolis(EEP) on the growth, glucosyltransferase(GTase) activity, and adherence to the saliva-coated hydroxyapatite(S-HA) beads of Streptococcus mutans JC-2(serotype c), S.mutans LMM-7(serotype e), and S. mutans OMZ-175(serotype f) in vitro. We found that the EEP had minimal inhibitory concentrations of 500-1000㎍/㎖ against S.mutans strains when these strains were cultured for 48 hours, and inhibited both water-insoluble and water-soluble glucan synthesizing GTase activities of S. mutans strains to the 93-100% at the concentration of 1600㎍/㎖, and also we found that the EEP inhibited the adherence of S. mutans strains to S-HA beads to the 76-96% at the concentrations of 200㎍/㎖. These results indicate that EEP has anti-cariogenic activity in vitro.

일측 경추 신경근증에 대한 전방경유 미세 추간공확장술의 기술상의 개선

김대용,김우경,이상구,김영보,박철완,박찬우 The Korean Neurosurgical Society 2004 Journal of Korean neurosurgical society Vol.35 No.2

블루투스 보안에 관한 연구

류대현,최태완 한세대학교 2001 敎授論叢 Vol.17 No.-

블루투스는 무선으로 기기 간에 정보를 교환하므로 정보보호 측면에서 취약점을 갖고 있다. 본 논문에서는 먼저 블루투스 시스템과 블루투스 정보보호에 대해 설명한다. 또한 블루투스 규격에서 정의하고 있는 정보보호 구조를 분석하고 그 취약성을 제시하고자 한다. Bluetooth transfer information to each devices wirelessly, so it is very susceptible to attacks. This paper first gives some background information about Bluetooth system and its security issues. Then we point out flaws and possible security holes in the Bluetooth Security Specification.

중국에서 이식한 종어 (Leiocassis longirostris Gunther)의 외부 형태 및 초기생활사

이완옥,김경환,김대희,조용철,김응오 한국어류학회 2004 韓國魚類學會誌 Vol.16 No.1

한국에서 절멸된 것으로 알려진 종어 (Leiocassis longifostris)를 국내에 복원하고, 양식대상종으로 개발하기 위하여 중국에서 도입하여 외부형태를 비교하고, 난발생 과정 및 부화자어의 형태를 연구하였다. 도입된 표본의 계수·계측형질을 국내와 중국에 알려진 문헌과 비교한 결과 큰 차이를 보이지 않았다. 중국에서 도입한 암수 한쌍의 성어에서 채란하였고, 습식법으로 수정하였다. 수정란의 크기는 2.01∼2.10 mm(n=10)이었으며, 알의 형태는 원반형이고, 난막은 무색투명하였으며, 강한 접착력이 있었다. 난황은 담황색이고 유구는 없었다. 수정 1시간 후에 배반이 완성되었고, 1시간 30분 후에 난할이 시작되었다. 수정란의 수온을 21.5∼23.0℃로 유지할 때 30∼50분 간격으로 이후 난할이 계속되었다. 수정 후 상실기는 6시간에 도달하였고, 낭배기는 20시간 20분 후에 완성되었다. 난황 표면에서 관찰되는 특이한 연동운동은 상실기에 시작되어 포배기 말기인 30% epiboly기까지 계속되었다. 수정 75시간 후에 부화에 이르렀고, 부화 직후 자어의 크기는 전장 5.91∼6.10 mm 이었다. 부화 3일 후에 입이 열리고, 수염과 부레가 완성되었으며, 전장 9.07 ∼9.37 mm까지 자랐다. 부화 15일후에는 모든 지느러미가 완성되어 후기자어기 상태이었고, 전장 14.80∼16.50 mm로 자랐으며, 부화 25일 후에는 체형, 체색 그리고 생활습성 등이 성체와 유사하고, 전장은 18.59∼22.35 mm까지 성장하였다. The Long-snout bullhead, Leiocassis longirostris, is an introduced fish from China which had become extinct in Korea. Its morphological characteristics and early life history was studied to obtain useful information required for restoration of the species and also for its utilization as an aquaculture fish. Measurements and counts of specimens introduced into Korea were included in the range of those taken from the known literature of Korea and China. Eggs were obtained by fertilization by wet method in the laboratory using one mature male and female adults of introduced L. longirostris. The fertilized eggs measured 2.01-2.10 ㎜ (n = 10) in diameter. The eggs were diskshaped and strongly adhesive, with colorless transparent membrane. The yolk was pale yellow in color with no oil globule. The blastodisc was formed in about 1 hour and cleavage started around 1 hour 30 minutes after fertilization. The cleavage intervals were about 30-50 minutes at 21.5-23℃. The morula stage was reached at 6 hours, and gastrulation was completed at 20 hours 20 min. after fertilization. Peristalsic movements of the yolk surface started at the morula stage and continued to the blastula stage (30% epiboly). Hatching occurred 75 hours after fertilization, and newly hatched larvae were 5.91-6.10 ㎜ (n = 10) in total length (TL). The mouth was open, and barbels and the air-bladder were completely formed 3 days after hatching, at 9.07-9.37 ㎜ TL. All the fin rays were completely formed and the larvae became a postlarva 15 days after hatching at 14.80-16.50 ㎜ in TL. Body shape, color pattern, and habitat behavior were similar to those in the adult at 25 days after hatching and a size of 18.59-22.35 ㎜ TL.