각종 소화성질환에서의 Campylobacter Pylori의 검출에 관하여

허정욱,강영우,박준호,박승국,하경임,김재룡,안성훈,박선우 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

Peptic disorders are among the most common maladies in korea as the world. In most cases their etiologies not be established and their pathophysioolgy remain obscure. Although the persence of fastric bacteria has been logn established, recently campylobacter pylori seems to be etiologic agent of peptic disorders. Campylobacter pylori is visualized in most cases of peptic disorders and not visualized after treatment of bctericidal agents, bismuth compound or metronidazole. We had a following results for identification of campylocacter pylori in stomach and duodenal mcuosa via endoscipc biopsy. 1. We studied 54 patients who had dyspeptic symptoms, 29 males. 2. Most patients are in 5th decades, next in 3rd and 6th in order. 3. Ptients were composed of 27 peptic ulcer, 22 gastitis and 5 gastric carcinoma. 4. Campylobacter pylori was identified in 69% of total patients, peptic ulcer 63%, gastritis 77%, stomach carcinoma leastly.

9-12%Cr강의 첨가원소 및 열처리에 따른 미세조직거동과 경도변화

주성욱,유정훈,신기삼,허성강,이재현,석진익,김병훈,김정태 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

9-12%Cr steel are getting increasing attention for expanded application as high temperature materials applicable for gas turbine compressors, steam turbine rotors, blade and casing. For efficient and extensive application of 9-12%Cr steel, the data in addition to the improvement of mechanical properties on the correlation of microstructural evolution and mechanical properties are inevitable and thus the investigation in this study is performed for the determination for the specimens heat-treated at 600, 650 and 700℃ for 1000, 3000 and 5000hrs. The microstructure of as-received specimen was tempered martensite, with a high dislocation density and secondary phases. Upon high temperature heat-treatment, the martensite lath got larger and dislocation density decreased resulting the reduction of the strength. In addition, sharp growth of secondary phases was observed in the specimen heat-treated at 700℃ for 5000hrs. A specimen aged at 600℃ and 650℃ Laves phase was observed. The hardness showed close relationship with the secondary phase particle and dislocation density.

패턴구성에 따른 RPNN의 음성인식 성능비교

김주성,한학용,허강인 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

In this paper, we use th RPNN as a non-linear predictor according to the time variation of a speech without an alignment procedure. We perform the recognition experiment of Korean 100 syllables based on RPNN In the experiment, we compare the recognition rates, by increasing the prediction order and the number of hidden(recursive) units, and by composing the pattern. When the prediction order is 3-rd order and the hidden units are 10 units, the recognition rates show better result than others. And when we compose the pattern as the method 2, they are far improved than the method 1. In the method 1, the highest recognition rate is 82.40% at the 4-th prediction order and the 10 hidden units. And in the method 2, it is 84.90% at the 3-rd prediction order and the 10hidden units, and it is improved at 2.50% than the method 1

CFG를 이용한 제어문 음성 인식에 관한 연구

김상범,김주성,김수훈,허강인 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

In this study, we perform continuous speech recognition system using context free grammar. We use DDCHMM as train model, that is able to express time-transient-variation very well. Using one pass DP method as recognition algorithm which is attempted by expanding dynamically a finite automaton from a part of suggesting context-free-grammar of recognition process. We can increase the recognition rates of control sentence speech recognition. Car control command, robot control command, and newspapers editorial continuous speech are made to test recognition rates of control sentence speech using context-free-grammer.

STS 304 스테인리스강의 플라즈마 페이스트 침붕처리에 관한 연구

李聖道,李贊揆,孫明淑,尹在弘,許聖康 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

Various surface properties of boride layer formed by plasma paste boronizing were examined. A boride layer of flat structure was formed on the STS 304 stainless steel substrate by plasma paste boronizing treatment with several different temperature from 1023K to 1223K under gas mixture of Ar/H₂: 2/1(vol.%). The paste was composed of 30wt% boron and 70wt% borax. The properties of boride layer were evaluated by micro vickers hardness tester, SEM, EPMA, and corrosion tester. Metallographic cross section of the borided specimen was consisted of the boride layer, Ni rich layer, Cr rich layer, and matrix structure. It was found to form boride layer in a short time to conventional boronizing methode. In XRD analysis of boride surface, various peaks such as FeB, Ni₃B and CrB were presented. Especially, the peak of CrB was more intensive than other peaks. Activation energy for the formation of boride layer was found to be 123kJ/mol which is lower than the conventional boronizing treatment. The microhardness of these boride layers were in the range of HV 1800∼2000. However, from the results of anodic polarization curve in 1M H₂SO₄solution on the borided specimens, it is found that the corrosion resistance is improved by boronizing treatment. Primary current density is, however, increased with the Boronizing temperature.

회귀예측신경망을 이용한 음절인식

김주성,김상범,김수훈,허강인 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

In this paper, we perform the recognition test for Korean 100 monosyllabes using RPNN(recurrent prediction neural networks). The RPNN is trained to nonlinear predictor, accoding to time variation of speech pattern, is not use time sequential algorithm. In recognition experiment we got the recognition rate 69.0%, 72.30% and 71.20% using RTRL(real-time recurrent learning) training algorithm when the predition order is 2, 3 and 4.

Urban Entertainment Center 사업과 지역경제의 파급효과 분석

주수현,허정옥,진금옥,강상주 동의대학교 경제경영전략연구소 2006 經濟經營硏究 Vol.4 No.1

This research is designed for conducing spreading effects of regional economy by analyzing Input-Output Model(i.e. production model, employment model, value model, and income model). These measures of spreading effects in regional economy were determined by precise analyses of feasibility and demands of public businesses. That would be effective and confident polices and supportive for long time in the regional ecinimy. One of the most effectibe analysis on the spreading effects of regional economy is draw up Input-Output Model(IOM). This article, based on 2000 IOM of Busan Area, is focused that how the turbulence level of final demands affected spreading effects of regional economy, such as industrial production, value added, employment, incom etc. Also there were included the analysis of economic analyses of spreading effects on the UEC in the Centum City businesses.

Ti첨가 및 균질화 처리가 원심주조한 Cu-Zn-Al계 고력황동의 기계적 성질에 미치는 영향

권영한,허성강,김창규,윤재홍 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

Effects of Ti addition and homogenizing treatment on the mechanical properties in Cu-Zn-Al system high strength brass were investigated. Grain refinement was successfully achieved by Ti addition: The microstructure, which was composed of island or fine feather-like branched Ti compounds was changed to feather-like eutectic microstructure as the content of Ti increased. The highest hardness values was obtained for 0.5wt% Ti specimen and the second was Ti non-added specimen in as-cast conditions. Maximum tensile strength was obtained for 0.5wt% Ti specimen. Dueing to the presence of cast defects and worse castability, tensile strength decreased as the content of Ti increased. Elongation was increased with increasing homogenizing time and temperature: remarkable increase was obtained for 400℃ homogenizing temperature in the 0.5wt% Ti specimen. For 500℃ and 600℃ homogenizing temperature, high elongation was obtained in 2 and 4wt% Ti specimen.

Staphylococcus aureus와 Coagulase-Negative Staphylococcus Species에 대한 Arbekacin의 시험관내 항균력

위성헌,강진한,허동호,이동건,김상일,김양리,최정현,김종현,유진흥,허재균,신완식,강문원 대한감염학회 2001 감염 Vol.33 No.4

Background : Most strains of methicillin-resistant Staphylococcus aureus (MRSA) now exhibit high-level resistance to various antibiotics, such as β -lactam antibiotics, aminoglycosides, macrolides, tetracyclines and quinolones. Recent reports describing the therapeutic failure of vancomycin for MRSA infections have arisen considerable concerns regarding the emergence of MRSA strains, which will require new therapeutic agents. Arbekacin, an aminoglycoside antibiotic, has antibacterial activity against both gram-positive and gram-negative bacteria and is stable in the presence of aminoglycoside inactivating enzymes produced by S. aureus. In this study, we compared the antibacterial activity of arbekacin with those of vancomycin, gentamicin, and amikacin against Staphylococcus aureus (S. aureus) and coagulase-negative staphylococci (CNS). Methods : For a collection of 549 S. aureus and 251 CNS isolates from three Catholic University Hospitals in Korea, minimum inhibitory concentrations (MICs) of arbekacin, vancomycin, amikacin and gentamicin were determined by agar dilution method using Mueller-Hinton agar according to NCCLS (National Committee for Clinical Laboratory Standards, USA)criteria. Results : Among 549 S. aureus isolates, 278 isolates were MRSA and 271 isolates were methicil sensitive S. aureus (MSSA). MIC50 & MIC90 of arbekacin against 549 S. aureus were 0.5 & 1 ㎍/mL, and MIC50 & MIC90 of vancomycin were 1 & 1 ㎍/mL. MIC of arbekacin against 549 S. aureus isolates ranges from 0.03 to 4 ㎍/mL, and MIC of vancomycin against 549 S. aureus ranges from 0.25 to 2 ㎍/mL. MIC90 of amikacin against 549 S. aureus was 32㎍/mL, and that of gentamicin was 128 ㎍/mL. MICs of amikacin and gentamicin were variable, ranging from 0.125 to 256, and otherwise arbekacin and vancomycin revealed relatively narrow range of MICs. MIC90 of arbekacin against 278 MRSA isolates & 271 MSSA were 1 & 0.5 ㎍/mL, and those of vancomycin against MRSA & MSSA were 1 & 1 ㎍/mL. MIC90 of amikacin against 278 MRSA & 271 MSSA isolates were 32 & 4 ㎍/mL, and that of gentamicin against MRSA & MSSA isolates were 128 & 32 ㎍/mL respectively. Among 251 CNS isolates, 122 isolates were MRCNS and 129 were MSCNS. MICSO & MIC90 of arbekacin against 251 CNS isolates were 0.25 & 2 ㎍/mL, and those of vancomycin were 1 & 2 ㎍/mL. MIC of arbekacin against 251 CNS isolates ranges from 0.015 to 32 ㎍/mL, and that of vancomycin isolates ranges from 0.25 to 2 ㎍/mL, MIC90 of arbekacin against 122 MRCNS & 129 MSCNS isolates were 2&0.3 ㎍/ML, and those of vancomycin were 2&s ㎍/ML. MIC90 of amikacin against 251 CNS isolates was 32 ㎍/ML, and that of gentamicin was 128 ㎍/ML for CNS. MIC90 of amikacin against 122 MRCNS & 129 MSCNS isolates were 128 & 8㎍/mL, and those of gentamicin ere 256 & 32 ㎍/mL. Conclusion : Considering above results, arbekacin can be useful agent against most strains of MRSA and MRCMS, which exhibit high-level resistance to amikacin and gentamicin. (Korea J Infect Dis 33:254~260, 2001)

PLASMA 이온 질화처리 한 Ti-6Al-4V의 표면물성에 관한 연구

손명숙,허성강,윤재홍,이영생,박노광 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

The purpose of this study is to improve the surface hardness and corrosion resistance of Ti-6Al-4V by ion nitriding treatment. As well known, the ion nitriding is widely used an effective surface hardening method and principal parameters of the ion nitriding are temperature and time. Ti-6Al-4V alloys were ion-nitrided under the atmosphere of the nitrogen-hydrogen mixture gas and surface modified layers were observed. Experimental results represent that the surface modified layers are formed as a multiphases of TiN and Ti₂N. The hardness of the layers are in the range Hv of 1000 to 2000. The multiphase layers also showed excellent corrosion resistance in 2 Mol HCl solution at room temperature, comparing to the non-coated layers. The kinetics show that the growth of the layers by N₂ diffusion were proportional to t½. The kinetics energy for the formation of nitride layers was 174KJ/mol.