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균열저감형 생석회계 바닥마감 모르타르의 배합 및 입도조건 변화에 따른 팽창 및 건조수축특성
이종열,이웅종,박석균 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.2
The cement based mortar is typically used as the surface finishing material for apartment floor. By the way, the crack is easily appeared with the lapse of time in this floor mortar because of the shrinkage effect of the cement. In our country, the most popular expansive additive is hauyne(CSA) or free lime(free-CaO) system. The types of shrinkage in the surface finishing mortar is known as plastic shrinkage, dry shrinkage and autogenous shrinkage. In this study, the expansive properties of the free lime system with various size distribution is analyzed. In particular, the experiment for the expansive properties is carried out by using the soundness molds and with various humidity and dry setting conditions. In addition, the difference of dry shrinkage properties between the cement with expansive additives and OPC is investigated under different conditions of water/cement ratio and sand/cement ratio.
양성 및 음성 정신분열병 아형에서 사고의 정신병리적 특성에 관한 비교연구
김종숙,함웅,홍광화 대한신경정신의학회 1994 신경정신의학 Vol.33 No.3
The authors have studied the content and severity of thought disorder between the subjects of the positive and negative subtypes of schizophrenia. It's hypothetical ground is that the positive and negative subtypes of schizophrenics might bear highly significant differences in the pathogenesis, pathophysiology, psychopathology, also therapeutic and prognostic terms. In that regards, the author reported the neuropsychological significance in differentiating the two subtypes from each other, such that the negative subtype showed the worse function in the short-term recall against the auditory stimuli than the positive. To comparatively analyze the content and severity of thought disorder between the two subtypes, the authors utilized the Thought Discorder Index(TDI) scores and Holt's scale of the primary process thinking content. The results were as follows: 1) The total score of TDI as a whole, showed somewhat more thought disorder in the positive subtype subjects than the negative, though this failed to reach the statistical significance. In 0.75 level of TDI, the positive subtype subjects showed statistically significantly worse thought disorder than the negative. 2) In the comparative study of the primary process thinking content, the positive subtype subjects showed degree in the aggressive content but lower degree in the anxiety content than the negative subtype subjects with statistical significance. 3) In the correlation study, 0.5 level of TDI correlated with the libidinal content of the primary process with blunted affect and the aggressive content with lack of spontaneity and flow of conversation. The above result might suggest that the positive subtype of schizophrenia demonstrated more severe thought disorder, if we regard that responses scored at the 0.75 level of TDI represent clear thought disturbances. The negative subtype of schizophrenia tends to possess higher anxious and libidinal content of the primary process thinking.
正常 및 腫瘍性骨組織의 Lectin結合에 關한 免疫酵素組織化學的硏究
尹錫雄,崔宗相,白承龍 고려대학교 의과대학 1986 고려대 의대 잡지 Vol.23 No.1
To Clarify the patterns of lectin binding on the normal bone and cartilage and the changes in lectin receptors between the normal and neoplastic bone tissues, the author had performed an immunoenzyrne histochemical study. Eight lectins such as Concanavalin-A(Con-A). Dolichos biflorus agglutinin(DBA), peanut agglutinin(PNA), Ulex europaeus agglutinin I(UEA I), soybean agglutinin(SBA), wheat germ agglutinin(WGA), Ricinus communis agglutinin I (RCA I), and Pinellia ternata agglutinin(PTA) were used oil the normal bone arid cartilage tissue in addition to each three cases of osteoblastoma, osteogenic sarcoma, enchondrorna, chondrosarcorna, giant cell tumor, Ewing's tumor, multiple myeloma, simple bone cyst, and fibrous dysplasia. Avidinbiotin system was used and substrate used was 3-3' diaminobenzidine. The results obtained are as follows; 1. In the normal and neoplastic bone tissue, PKA, Con-A, PTA, RCA I, and WGA showed positive reactions in the cystoplasms of the osteocytes and osteoblasts. 2. In the normal and r,eoplastic chondroid tissues, RCA I showed positive reactions in the chondrocytes. 3. On the neoplastic cells of the Ewing's tumor, DBA, UEA I, Con-A and PTA showed cytoplasmic positive reactions, and on the plasma cells of the multiple myeloma, PNA, Con-A, PTA, RC-4 I, and WGA showed positive reactions. 4. On the neoplastic cells of the giant cell tumor of bone, Con-A, PTA, and WGA showed positive reactions, contrary to negative reactions of the above 8 lectins to the giant cells of the tumor. 5. PNA, Con-A PTA, and RCA I showed positive reactions against the fibrous spindle cells of the simlpe bone cyst and Con-A, PTA, and RCA I showed-positive reactions of the spindle cells of the fibrous dysplasia. With the above results, the author can find that there is no difference of lectin receptor between the normal and neoplastic bone and chondroid tissue and also confirm the diffenerence of lectin binding pattern between the osteoclasts and giant cells of the giant tumor.
폐타이어로 성형제조된 부정형 과립담체에 부착된 미생물의 측정방법
박종웅,송주형 대한상하수도학회 2003 상하수도학회지 Vol.17 No.2
This study was carried out to know the physicochemical properties and determine the measurement method of attached biomass in irregular shape granular (ISG) media molded with waste tire. The size of ISG media and specific surface area were Φ4-10㎜ and 0.00412㎡/g, respectively. The using of pretreatment agents as 0.8N CuSO_4-0.7N Sulfamic acid was proper to prevent self-oxidation of attached biomass on ISG media. The detaching method of attached biomass in ISG media was suitable for conducting ultrasonic and alkali treatment at the same time. The optimum alkali concentration and washing time were 0.125N NaOH and 120min, respectively. Finally, it was concluded that the result of this study could be establishing as a measurement method of attached biomass on ISG media molded with waste tire.
윤재웅,이권용,이수철,최종근 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.1
The development of flexible automation in the manufacturing industry is concerned with production activities performed by unmanned machining system. A major topic relevant to metal-cutting operations is monitoring tool wear, which affects process efficiency and product quality, and implementing automatic tool replacements. In this paper, the measurement of the cutting force components has been found to provide a method for an in-process detection of tool wear. The static components of cutting force have been used to detect flank wear. To eliminate the influence of variations in cutting conditions, tools, and workpiece material, the force modeling is performed for various cutting conditions. The normalized force disparities are defined in this paper, and the relationships between normalized disparity and flank wear are established. Finally, artificial neural network is used to learn these relationships and detect tool wear. According to the proposed method, the static force components could provide the effective means to detect flank wear for varying cutting conditions in taming operation.
클로르헥시딘의 접착성 수복재의 결합에 미치는 영향에 관한 비교 연구
염혜웅,김종수,권순원 大韓小兒齒科學會 2002 大韓小兒齒科學會誌 Vol.29 No.1
치아 수복 후 나타날 수 있는 술 후 동통과 치수 병변의 주원인은 수복재 자체의 독성보다는 박테리아의 침투에 의한 것으로 알려져 있으며, 와동내 항균제 처리는 잔존 박테리아를 제거하여 제 증상을 완화하는데 효과적이지만, 상아질면이나 상아세관에 잔유물을 남겨 상아질 결합제와 치질간의 긴밀한 결합을 방해하여, 미세누출을 증가시키고, 결합강도를 약화시킬 수 있다고 알려져 있다. 2% 클로르헥시딘 도포가 접착성 수복물과 치질과의 결합강도 및 미세누출에 미치는 영향을 평가하기 위하여, 건전한 소의 전치 상아질을 노출시키고 와동을 형성한 후, 클로르헥시딘을 도포하고 복합레진, 컴포머 그리고 글라스아이오노머를 각 제조사의 지시에 따라 각각 충전하고, 100회 열순환 처리 후 전단 결합 강도와 미세누출 양상을 비교 평가하였다. 상아질 전단 결합 강도와 수복재 변연 미세누출 양상에서 실험군과 대조군간에 통계학적 유의차를 보이지 않았다. Bacterialmicroleakage around restorations is considered the principal cause of pulpal inflammation associated with restorations. The rationale for using cavity disinefectant is based on its antimicrobial properties but the cavity disinfectant may leave debris on dentin surfaces. The purpose of this study was to evaluate the effect of 2% chlorhexidine on shear bond strength and microleakage of adhesive restoration. 45 sound bovine teeth were used for the shear bond strength test and 30 for the micorleakage. For the experimental groups, 2% chlorhexidine was applied before the restorations, and was not for the control groups. The result from the this study can be summarized as follows; 1. No significant difference could be found in shear bond strength of each group. 2. No significant difference could be found in microleakage of each group.
金倧熙,李敏雄,李榮俊 동국대학교 농림과학연구소 1969 農林科學 論文集 Vol.3 No.-
As a result of an elementary study for the physiological nutrition of setting up the composition of synthetic medium in Erwinia-araliavorus, the effect of hydrogen ion concentration, several kinds of carbon sources, inorganic nitrogen sources, phosphate sources, micro metals and concentration of potassium phosphate mono-basic, Potassium phosphate di-basic on the growth of this bacteria have been investigated and are summarized as follows; 1. The effects of hydrogen ion concentration on the growth of this bacteria in the basal medium, optimum hydrogen ion concentration range was 7.5. After incubation the hydrogen ion concentration altered it's formal medium concentration. The strong acidity changed into weak acidity, the strong alkali into weak alkali. 2. The effects of several kinds of carbon sources on the growth of this bacteria, Soluble starch, Inulin and Maltose showed best results and followed by Sucrose and Mannite. Organic acid in the carbon sources was not used effectively as nutritional elements. After incubation hydrogen ion concentration was changed into weak acidity. 3. In the effect of nitrogen sources on the growth of the bacteria, Alanine as a organic compounds and KNO_3 as a inorganic compounds were respectively effective on the growth. L-Isoleucine and NaNO_2 were poor effect. Among this nitrogen sources, Alanine showed the best result and L-Isoleucine was appreciably poor effect. After incubation the hydrogen Ion concentration altered it's formal medium concentration into weak acidity. 4. In the effect of phosphate sources on the growth of this bacteria, Potassium phosphate mono-basic was effective. Sodium phophate tri-basic, Ferric phosphate and Potassium phosphate di-basic showed comparatively good results but Ammonium phosphate mono basic and Calcium phosphate tri-basic proved less effective. After incubation the hydrogen Ion concentration of this medium was altered into weak acidity. 5. As for the effects of micro metal sources on the growth of this bacteria, optimum concentration in each micro metal sources showed the following; Ferrous sulfate 100(㎎/100ml), Zinc sulfate 0.1(㎎/100ml) Curpric sulfate (㎎/100ml). Magnesium Chloride 10(㎎/100ml) Manganese sulfate 10(㎎/100ml), Natrium Melybdae-nium(㎎/100ml), Calcium Chloride 10(㎎/100ml) and Boric acid 1(㎎/100ml). Among these micro metal sources, ferrous sulfate, Zinc sulfate, Manesium chlorid0 and Natrium molybdaenium showed especially best results, followed by Calcium chloride, Manganese sulfate and Cupric sulfate. The Boric acid showed poor effects. Also in the medium to which no metal sources were added the growth of this bacteria was ineffective. After incubation the hydrogen Ion concentration generally changed into weak acid. 6. In the effect of Potassium phosphate mono basic and Potassium phosphate di-basic concentration on the growth of this bactecia, Potassium phosphate mono-basic showed the best result when concentration 0.1(g/100ml) was added in the basal medium. No addition of phosphate to the basal medium was appreciably decreased and followed by Potasium phosphate di-basic 0.01(g/100ml). The growth of this bacteria was much enhanced when concentration of Potassium phosphate mono basic 0.1(g/100ml) and Potassium phosphate di-basic 0.05(g/100ml) were added to the basal medium and the growth diminished when concentration of Potassium phosphate mono-basic 0.5(g/100ml) and Potassium phosphate di-basic 0.01(g/100ml) were added to the basal medium. After incubation the hydrogen Ion concertration of medium generally changed into acidity.
김종훈,남궁준,박혜연,황철웅,박경일,도준형,이성윤,이원로 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
The transient left ventricular apical ballooning syndrome, also known as takotsubo cardiomyopathy is a recently described novel cardiac syndrome. This syndrome is characterized by transient asynergy of the ventricular apex or mid-ventricle in the absence of obstructive epicardial coronay artery disease. This report concerns two types of morphologic difference about left ventricular apex and mid-ventricle. In this case, we report two types of stress-induced cardiomyopathy with review of literatures.
요오드이동중합에 의한 Telechelic Diiodo-poly(VDF-co-HFP)의 합성연구
원종웅,이범재 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2
The structure-controlled α,ω-diiodo-poly(vinyliene fluoride-co-hexafluoropropylene) was polymerized by Iodine Transfer Polymerization(ITP), which in one of the controlled telomerization methods. The molecular weight of the polymer increased linearly with polymerization time and [monomer]/[iodide] ratio and the polymer showed a narrow molecular weight distribution (PDI<1.3). The chain-end structure of α,ω-diiodo-poly(vinyliene fluoride-co-hexafluoropropylene) was consisted of both -CH_2CF_2-I and -CF_2CH_2-I. This difunctional ITP of VDF/HFP was found to show the pseudo-living characteristics, in which molecular weight could be controlled and the functionality was close to 2. This telechelic copolymer with Mn<10,000g/mol can be used as telechelic fluorinated prepolymer after transformation of the chain-end iodo group.