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강재현,유성구,서길수 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2
In this study, octadecyltrimethylammonium ion was intercalated in the gallery space of layered sodium montmorillonite(MMT) via an ion-exchange reaction. The gallery space was further modified by grafting of the aminopropyl groups via a reaction between a octadecyltrimethyl-ammonium-MMT intercalation compound and 3-aminopropyltriethoxysilane(APS) in order to use as a filler for epoxys-clay hybrid nanocomposites. The interlayer modification of MMT was confirmed by XRD, IR, and 29Si MAS NMR. Furthermore, the resulting hybrid nanocomposites were characterized by XRD, transmission electron microscopy(TEM) and scanning electron microscopy(SEM). The results proved that the organomontmorillonite could be exfoliated into ca. 100Å thickness and uniformly dispersed in the epoxy matrix.
대장암에서 Adenomatous Polyposis Coli(APC) 유전자의 변이에 대한 연구
강현욱,김창진,이봉재 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2
The colorectal carcinoma was once considered a dominant malignancy in the westerized country. But as Korean life and food consumption styles follow those of western country,colorectal carcinoma in Korea has been increased. Among the several mechanisms of colorectal carcinogenesis, the molecular genetic alterations are best understood of any other common human cancers. Colorectal carcinomas demonstrate extensive molecular genetic alterations throughout the genome. Among several dominant acting oncogenes, a kind of tumor suppressor gene, APC(adenomatous polyposis coli) gene mutation has been commonly observed in colorectal carcinoma, and the deletion of APC gene appears to be an early event in the tumorigenesis. This study is conducted to see the APC gene mutation in 10 cases of adenomas, 20 cases of adenocarcinomas and 3 cases of familial polyposis by observing LOH(loss of heterozygosity) in APC gene exon 11. The DNA was extracted from paraffin block tissue sections and APC gene exon 11 was amplified by polymerase chain reaction(PCR). The PCR product was digested by Rsa I endonuclease and LOH was observed by gel electrophoresis. In the study, only informative cases are included. The resuslts were as follows; 1. Among 10 cases of adenoma, 7 cases (70%) revealed LOH, while among 20 cases of carcinomas, 10 cases(50%) showed LOH. All the 3 cases of familial polyposis revealed LOH. 2. There is no relatoinship between clinical stages and LOH of APC gene. Above results showed that APC exon 11 gene mutation contribute to early stage of colorectal carcinogenesis and it has no effect on tumor progression. But to elucidate precise mechanism of carcinogenesis, more studies in the molecular level should be conducted.
의료관계 해부 감정예의 분석적 연구(I) : 1990년 국립과학수사연구소 감정예
姜信夢,李垣兌,李漢榮,尹順雄,全基悳,金相鉉,徐在冠,尹重鎭 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2
A study of 118 autopsy cases associated with medical care in 1990 was present according to the medical department, the mode of treatment and the cause of death. The Pediatrics showed the highest rate (25.4%), followed by the Obstetrics & Gynecology (22.9%), and Internal medicine (20.2%). According to the mode of treatment, medical accidents during operation and anesthesia were 29 cases (24.6%) with highest rate in Obstetrics & Gynecology (13 cases), 38 cases (32.2%) were during medication and/or injection with highest rate in Internal Medicine (18 cases), and 51 cases (43.2%) were during general medical practice with highest rate in pediatrics (19 cases). The most prevalent cause of death was the disease of respiratory system (34.9%, 30 cases) and the diseases of cardiovascular and urogenital system accounted for 31.4% and 11.6% respectively. The main cause of death in Internal medicine was the disease of cardiovascular system (11/24 cases), the respiratory system in pediatrics (15/30 cases) and the disease of urogenital system in Obstetrics & Gynecology (9/27 cases. ) Asphyxial deaths were 7 cases and the death due to adverse drug reaction accounted for 10 cases.
Zn를 첨가한 고온초전도체 Y Pr Ba₂Cu₃O 의 Raman 분석
강재필,김성재,박현진,노태호,송승기,박영민,전인 明知大學校 自然科學硏究所 1997 자연과학논문집 Vol.15 No.-
고온초전도제 Y Pr Ba₂Cu₃O 에 Zn를 첨가(x=0.00, 0.05, 0.10, 0.15, 0.20)하여 전이온도 측정, X-ray회절 실험과 Raman 실험을 하였다. Raman 측정결과 다섯 개의 시료가 일반적인 YBCO 초천도체의 Raman 스펙트럼에서 존재하는 다섯 개의 대칭활성모드(115cm¹,150cm¹.340cm¹,440cm¹,504cm¹)가 관측되었다. 이것은 Cu 와 관련된 대칭활성모드의 주파수가 모두 저주파 변위를 나타내어 Zn가 Cu(1)과 Cu(2)에 치환되었음을 의미한다. 저주파 변위 정도는 Zn에 거의 무관했으나, Raman 스펙트럼의 각 피이크의 선폭은 치환된 Zn에 의해 증가했다. 이 결과는 Zn가 Cu자리에 어느 한계 이상은 치환되지 못하고 시료 내에서 불순물상을 형성함을 나타내는 것이다. We measured transition temperature, X-ray diffraction pattern and Raman spectra of Zn added(x=0.00, 0.05, 0.10, 0.15, 0.20) high-T superconductor Y Pr Ba₂Cu₃O All samples have been observed five symmetric activity modes(115cm,150cm¹.340cm¹,440cm¹,504cm¹)which exist in Raman spectrum of general YBCO superconductor. This means Zn is substituted for Cu(1) and Cu(2) due to the fact that symmetric activity mode frequency related with Cu shows low-frequency shift. The degree of low-frequency shift was nearly independent on Zn but line width of Raman spectra peaks were increased by the substituted Zn. This results shows that Zn does not be substituted for Cu-site more than limit value and formes impurity phase in the sample.
강동원,조재오,이현철,하홍곤,고태언 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-
Many control techniques have been proposed in order to improve the control performance of discrete-time domain control system. In the position control system using a DC servo motor as a driver, the response-characteristic of system is controlled by the I-PD controller. In the I-PD control system, the transient response characteristic is more increased and settling time gets longer if gains of I-PD controller are unsuitable. In this paper, a expanded I-PD control system is constructed by inserting a pre-compensator at output terminal of I-PD controller. it is implemented by neural network with two hidden layers. From the result of computer simulation in the proposed control algorithm, its usefulness is verified.
신경회로망에서 뉴런간의 연결도를 이용한 4백 배치 문제 해결 알고리즘
현해진,김덕주,강부식,이기태,임재윤 濟州大學校 工科大學 産業技術硏究所 1993 産業技術硏究報告 Vol.4 No.-
In this paper we have proposed a method for solving a four-coloring problem using adjusted information transmission between adjacent neurons in neural networks. These algorithms are based on McCclloch-Pitts binary neuron model neural networks. If a map shares n regions, a 4×n neural array is used to color a map of n regions where each neuron as a processing element performs it. By programming these algorithm by a C-language in IBM PC 486 DX and adapting it to various examples, we have showed the ability of our system. If one neuron is selected among four neurons, the strength of order three neurons is wakened. So, by transmitting the information of selected neuron, adjacent neurons cannot share the same color.
FAC-Biofilm과 F-A 시스템에 의한 下水處理 特性
姜龍太,柳在益,玄吉秀 동아대학교 환경문제연구소 1991 硏究報告 Vol.14 No.1
Through the comparative experiment of FAC-Biofilm and F-A system using the wastewater treated by FAC process, the following conclusions ca be drawn form the results of this research. 1. Despite the fluctuation of influent concentrations, FAC process showed that since the wastewater qualities treated by it were within the range of effluent quality regulation, it was adequate as pretreatment process 2. The results of comparative experiments of FAC-Biofilm and F-A system presented that for COD and SS removal, all of both system resulted in a desirable removal rate, but NH_(4)-N was largly reduced by Biofilm process. Particulary, phosphorus removal was more effective to pass through the biofilm process after coagulation and sedimentation. 3. The waste sludge amount in FAC process was calculated by the equation of that of Contact-Stabilization Method, because MLSS concentration in reaeration basin keep being constant could be anticipated steady-state in operation the FAC process.