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치경부 마모병소의 상아질 표면처리 방식에 따른 상아질과 접착제 간의 계면 양상
이용희,이희주,허복 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.1
In order to know the effect of dentin bonding agents on the restoration of cervical abrasion, Scotchbond Multipurpose, Single Bond and Clearfil Liner Bond 2 were used in 51 teeth with abrasion lesion and normal teeth. The surface structure anddentinal tubules of acid etched dentin and resin replica were examined using scanning electron microscopy. The inter facial morphology between dentin and adhesives was investigated by confocal laser scanning microscopy. Following results were obtained. 1.The hybrid layer and resin tag of the dentin showing cross-sectional surface of dentinal tubules are thicker and longer than those of dentin showing oblique surface of dentinal tubules. 2.The sclerotic cast was frequently observed in dentinal tubule, and the cast looked like cuboidal or rhomboidal-shaped crystals clumped from outer side to inner side. 3.The formation of hybrid layer and resin tag was the most prominent in Scotchbond Multipurpose group, whereas Clearfil Liner Bond 2 group showed very poor formation. The formation of hybrid layer and resin tag in Single Bond group was less than Scotchbond Multipurpose group.
Bipyridine Group을 갖는 플라빈 모델에서 중금속이온 인식
이용희,곽영규 동의공업대학 2001 論文集 Vol.27 No.1
3-(5-methylthiohexabromide-5'-methyl-2,2'-bipyridyl)-isoalloxazine(7),7,14-diethyl-3-(5-methylene-2,2'-bipyndyl)-10-methylbenzodiputeridine(8) have been synthesized respectively from isoalloxazine and benzodiputeridine (BDP) with 5,5'-(substituted)-2,2'-bipyridines having a side chain at the 5-position of the materials made under the influence of Raney nickel and β-picoline. The determinations of structure were on the basis of NMR, and the observation of molecular recognition ability about heavy metal ion(Zn^(2+), Co^(2+), Ni^(2+)) in the synthesized flavin derivatives was obtained from UV/Vis spectra.
수소결합에 의해 분자인식이 기대되는 Guanidium-Receptor 유도체의 합성
이용희,곽영규 동의공업대학 2000 論文集 Vol.26 No.1
To construct artificial enzymes, it is of primary importance to assemble catalytic groups and a substrate in the suitable position by covalent or noncovalent bonds. These facts prompted us to design a noncovalently assembled system which involves a thiazolium ion bearing a thymine moiety and Guanidium-Receptor having long methylen chain. Guanidium-Receptor(6a, 6b, 10) was synthesized by stepwise from cyanuric chloride in dioxane and ethanol. The structural determinations of the compounds were based on MP, NMR.
Capital Accumulation and Technological Change in the Dualistic Economy
이용희 경원전문대학 1999 論文集 Vol.21 No.-
본 논문은 농업부문과 도시산업부문의 구조적 특성과 두 부문의 상호간의 의존도를 분석하며 이로 인한 두 부문간의 노동력 재분배와 경제성장의 과정을 기술하고 있다. 또 경제성장 과정에 있어서 농업사회와 도시산업 사회가 각각 성공적인 발전을 위해 필요한 조건들에 대해 언급하고자 한다.
대칭형을 이루는 7,14-Dia1ky1-3, 10-Dimethylbenzo-diputeridine 유도체 및 Paracyclophane 합성
이용희,곽영규 동의공업대학 1999 論文集 Vol.25 No.1
To construct artificial flavoenzymes, it would be of primary importance to exploit oxidation-active flavin model compound, which are quite useful for turn-over catalyst under aerobic conditions and for exploitation of new oxidation. The derivatives of 7,14-dia1ky1-3, 10-dimethylbenzodipu-teridine(7a-c) having ethyl group, butyl group, and octyl group as alkyl group were synthesized from p-phenylendiamine, which is the starting material. the paracyclophane derivative(ll) was synthesized from p.p'-diaminodiphenylmethane being the starting material. The structural determinations of their derivatives were based on MP, NMR and UV.
ERP 동기 방식에 의한 EEG신호의 패턴 분류 및 인식
이용희 한라대학교 2007 論文集 Vol.10 No.-
In this paper, we present the method by the synchronous ERP to effectively extract and classify the EEG caused by only brain activity when a normal subject is in a state of mental activity. The method consists of into two parts. One is a synchronous recording on the event and the other is the extraction of the characteristics of EEG and pattern classification using the neural network. We measure the EEG when a subject who is in a normal state thinks of a specific task, and then shift the baseline and reduce the effect of biological artifacts on the measured EEG. Finally we extract only the mental task signal by averaging method, and then performs the recognition of the mental task signal from the extracted mental task signal by computing the AR coefficients. In the experiment, AEP signal is used as an event and the mental task signal was recorded from the three channel C_(3)-A_(1), C_(4)-A_(2) and P_(z)-A_(1). After averaging 16 times for each channel output, we extracted the features of specific mental tasks by modeling the output as 12th order AR coefficients. We used total 36th order coefficient as an input parameter of the neural network and measured the training data 50 times per each task. With data not used for training, the rate of task recognition is 34-92 percent on the two tasks, and 38-54 percent on the four tasks.
7-benzyl-14-ethyl-3-hydro-10-methylbenzodiputeridine 유도체의 합성
이용희,곽영규 동의공업대학 2000 論文集 Vol.26 No.1
The facile synthesis of 7-benzyl-14-ethyl-3-hydro-10-methylbenzodiputeridine derivative (12) being flavin model was achieved in 7-8 steps from p-nitroaniline being the starting material.
금속이온을 인식하는 Bipyridyl기가 붙은 플라빈모델들의 합성
이용희 東亞大學校 大學院 2002 大學院論文集 Vol.27 No.-
Search for flavin models bearing bipyridyl group has led to synthesize the isoalloxazine constructed with a side chain in the 5-position of 5,5′-(sustititued)-2,2′-bipyridine being the starting materials made under the influence of Raney Nickel and β-picoline. The determinations of structure in their derivatives were on the basis of MP, NMR. and we observed their molecular recognition ability by metal ion from UV/vis.
Illegal Migration from Mexico to the U.S. : An Application of the Harris-Todaro Model
이용희 경원전문대학 2001 論文集 Vol.23 No.-
좁아지는 세계노동시장속에서, 과거의 농촌에서 도시로의 노동력 이전이 현재는 제 3세계에서 임금격차가 있는 선진국가로 노동력이 국제적으로 이동하고 있으며, 그 대표적인 예로 멕시코 노동인력의 미국의 불법이민취업을 Harris-Todaro 모델을 중심으로 분석하였다. 멕시코인력 유입으로 인한 긍정적인 경제효과와 부정적인 사회전반의 영향을 잘 분석하여 바람직한 국외노동력에 대한 노동정책 수립이 요청되고 있다.