실시간 ATM 비디오 및 오디오 트래픽 분석

강은성,고유신,고성택 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1

It is important to analyze characteristics of real-time ATM traffic in order to control ATM traffic efficiently. VBR(variable bit rate) traffics such as real-time video traffic and audio traffic are monitored and analyzed based on data obtained from LAN traffic at Cheju National university. ATM traffic characteristics from the measured data are discussed. Cumulative density function(CDF) and traffic generation function (TGF) are obtained from the measured data. The traffic data generated from the TGF and the measured data are compared and the results show that the traffic data generated from the TGF is similar to the measured data. The TGF can be used to design congestion control algorithms, to implement communication protocols, and to develop switching architectures for the ATM network.

난연성 FREP로 휨보강된 철근콘크리트 보의 구조성능 평가

강기연,최기선,한상환,유영찬 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to evaluate the flexural strengthening performance of the iFREP(incombustible Fiber Reinforced Epoxy Panel) to the reinforced concrete flexural members. The tensile strength of iFREP including mechanical and physical properties of the epoxy resin for injection were tested preliminary to investigate the material properties of iFREP constitutions. Also the bond characteristics of iFREP to the concrete were estimated to acquire the basic design data for strengthening through various bonding tests. Finally full-scale RC beams strengthened by iFREP were tested monotonically upto failure to evaluate the strengthening effects of iFREP to the RC flextural members. The main variable of the four test specimens was the thickness of iFREP. From the test results, it was found that the failure mode of RC beams strengthened by iFREP was governed by the fracture of iFREP indicating the sufficient bond strength of iFREP to the concrete. Also flexural strengthening effects of iFREP to the RC beams is proportional to the thickness of iFREP.

얇은 도핑조절 a-Si:H초격자에서 지속 광전기 전도도

康聖洙,梁承勳,李原鎭,金英鳳,孔維庠,朴相俊,崔時永 慶北大學校 1990 論文集 Vol.49 No.-

Very large PPC effect(σ_ppc/σ_A=10^5) in doping-modulated npnp a-Si: H superlattices could be obtained. B and P atoms, respectively, diffuse and so some parts compensated. Therefore, annealing activation energy of E_a=0.67eV is larger than one of reference n-type sample of E_a=0.26eV and annealing dark conductivity of σ_A=4×10^-[ohm cm]^-1 is lower than that of n-type reference sample of σ_A=2×10 exp (4)[ohm cm]^-1. From this results, very large PPC relatively have obtained. In this paper, we have observed that PPC effect depends on temperature and exposure time. On the basis of the experimental results, we discuss the existing models.

난연성 FREP에 의한 철근콘크리트 보의 전단보강 성능평가

강기연,최기선,한상환,유영찬 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The purpose of this study is to evaluate the shear strengthening effects of the iFREP(incombustible Fiber Reinforced Epoxy Panel) to the reinforced concrete members and to provide the basic design recommendation for shear strengthening. The main variable were the thickness of iFREP, the amount of stirrup and the type of strengthening. Thirteen specimens were tested under static monotonic loading. From the test results, it was shown that the failure mode of RC beams which are strengthened by iFREP was governed by the delamination of iFREP. The shear capacity of beams strengthened by iFREP can be determined as the summation of the shear strengths provided by concrete, stirrup, and iFREP The shear strength by iFREP should be calculated based on the effective strain of iFREP. Also, the shear strengthening effects of specimen with two-side bonded iFREP is similar to those of specimen with three-side bonded iFREP (U-TYPE).

알루미늄 압출부재의 굽힘붕괴 해석 및 실험에 관한 연구

강신유,서성수 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-

This study is concerned with characteristics of bending collapse of aluminum members with multi-cell section. Aluminum is light so it is compatible of being used for vehicle structures members. Bending collapse behaviors of aluminum members with multi-cell section are very complex and tension failure mode are occured in experiment. In this paper, the aluminum members are modeled to be able to represent the tension failure mode and, characteristics of bending collapse of aluminum members with multi-cell section by experimental method are compared with the results of PAM-CRASH.

급성 구강감염부위에서 Staphylococcus lugunensis 의 특성

유용욱,이미성,차정단,김기경,신상희,문상은,김강주 원광대학교 생명공학연구소 1999 생명공학연구소보 Vol.6 No.1

Staphylococcus lugdunensis (S. lugdunensis) is a newly identified pathogenic species of coagulase negative staphylococci and an occasional but not rare cause of severe infections, such as infective endocarditis after dental extraction, bacteremia, osteomyelitis, peritonitis, and soft tissue infections. As antibiotic use increased, resistance rapidly developed. Some strains have plasmids related to antibiotic resistance. To characterize S. lugdunensis in acute oral infection, S. lugdunensis was isolated from the patients with acute oral abscess, osteomyelitis, and normal persons. Antibiotic resistance, in vitro cellular toxicity, in vivo virulence, δ-like hemolysin activity, and synergistic hemolysis on sheep blood agar plates were investigated. The dot blot analysis and Southern blot analysis of staphylococcal DNA was performed with δ-hemolysin gene probe of Staphylococcus aureus. (S. aureus) Staphylococcal DNA was cloned, nucleotide sequence was analysed, and homology was compared with other sequence in Gene Bank. S. aureus, S. lugdunensis, Staphylococcus cohnii (S. cohnii), and other coagulase negative staphylococci (CNS) were isolated from the patients with acute oral infection. The isolation ratio of S. lugdunensis in the patients with infection was higher than that of healthy persons, but the isolation ratio of S. aureus in the patients with infection was similar to that of healthy persons. S. lugdunensis from the patients with acute oral infection showed the resistance to penicillin, methicillin, cephalothin, and clindamycin. S. lugdunensis in the patients had cellular toxicity in vitro and virulence in vivo. All strains of S. lugdunensis had δ-like hemolysin activity against rabbit erythrocytes. Four of the six strains of S. lugdunensis gave synergistic hemolysis with S. aureus on sheep blood agar plates. In dot blot analysis, all strains of S. lugdunensis showed the positive reaction with the probe of δ-hemolysin gene in S. aureus, but a 7.3 kb HindⅢ fragment was observed in the DNA of S. lugdunensis that gave synergistic hemolysis in a Southern blot analysis. The molecular size of partially purified δ-hemolysin was about 50 kd. The cloned fragments from the chromosomal DNA of S. lugdunensis showed the partial homology with the insulin receptor-related and dopamine receptor of humans. These results suggest that S. lugdunensis might be an important pathogen in acute oral infection and show some homology with eukaryotes.

호산구성 간농양 54예의 임상상

강혜련,권혁수,송우정,이상민,김태범,박혜경,장윤석,김윤근,조상헌,민경업,김유영 대한알레르기학회 2004 천식 및 알레르기 Vol.24 No.2

다양한 철강용 RFID태그 안테나

이상곤,강진욱,정유정,김신환 대구대학교 정보통신연구소 2006 情報通信硏究 Vol.4 No.1

놀래기류에 기생하는 기생성 요각류, Caligus chanos에 관한 연구

고유봉,문성하,강경표,고경민 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-

The parasitic copepod. Caligus chanos parasitized on labridae fish around MunSum. Cheju Island, have been basically studied form Sep.. 1996 to Aug.. 1997. Parasitic pattern and water temperatures have a close relationship. which is high in June and low form Feb. to Apr.. Fishes of main hosts were Pseudolabrus japonicus and Pteragogus Ragellifer. Parasitic copepods prefer the body and tail of the host to the head, and prefer adult host to juveniles or older one.

저분자량 유기산을 이용한 Cu오염토양 복원에 관한 연구

공성호,유혜영,김용수,강순기 한양대학교 환경공학연구소 2000 環境科學論文集 Vol.21 No.-

Cu로 오염된 토양을 처리하기위해 중성 pH의 Citric acid와 Oxalic acid를 사용하여 농도와 유속의 변화두어서 실험실규모의 column test를 수행하였다. 안정화 상수가 높은 Citric acid (k=5.90)가 Oxalic acid (k=4.84)보다 높은 제거율을 보였다. 두 가지 유기산 모두 pH 4.5에 비해 pH 6에서 높은 제거율을 보였고 1mM에서 제거율은 상당히 낮았으며 10mM과 50mM은 처리 속도에 차이가 있었지만 최종제거율은 80.2%, 89.5%로 큰 차이가 없었다. 유속을 최저 7.34×10-3cm/min, 최고 7.34×10-2cm/min로 변화를 두었지만 10mM과 50mM의 경우 큰 차이가 없었다. column을 통과한 용액의 speciation을 GEOCHEM을 통해 예측해본 결과 10mM과 50mM의 유기산을 사용했을 경우 대부분의 Cu가 유기산과 복합체를 형성하고 있었으며, 유기산은 주로 free ion과 H+와 결합된 형태로 존재하고 있었다. Citric acid and Oxalic acid that have well known to form soluble complexes with Cu at near neutral pH of 5 to 7 as extracting agents. Lab scale column test was performed for optimizing operating parameter, changing pH, concentration and flow rate of organic acids. Citric Acid (k=5.90) which has high stability constant with Cu was higher removal efficiency than Oxalic Acid's (k=4.84). Both of two organic acids, removal efficiencies at pH 6 were higher than at pH 4.5. Concentration of 1mM organic acids did not provide effective removal efficiencies, but the removal efficiencies of 10mM and 50mM were significant high level. 10mM and 50mM were a little difference in removal rate but little difference in final efficiencies, respectively maximum 80.2%, 89.5%. Although we have performed column test, changing flow rate minimum 7.34×10-3cm/min to maximum 7.34×10-2cm/min, the removal efficiencies were little difference at 10mM and 50mM. Speciations of solution that passed through contaminated soil column were estimated by GEOCHEM simulation. For 10mM and 50mM organic acids, most of extracted copper existed as complexed forms with organic acids, and organic acids mostly existed as free ions and H-organic complex form.