서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

강원도 화천군 수달(Lutra lutra) 서식지의 식생 구조

서형수 ( Hyung Soo Seo ),신영섭 ( Young Seob Shin ),이경은 ( Kyung Eun Lee ),김윤미 ( Yoon Mi Kim ),전미나 ( Mina Jeon ),남택우 ( Taek Woo Nam ),한성용 ( Sung Yong Han ),정연숙 ( Yeonsook Choung ) 한국하천호수학회 2014 생태와 환경 Vol.47 No.special

In order to determine whether vegetation would be one of the factors for the selection of otter home range, vegetation structure and other potential factors were studied in Hwacheon, Korea. Thirteen sites, otter’s activity found and not found, were investigated in North Han River and connected tributary streams of Hwacheon-gun. Three types of vegetation were classified by cluster analysis, which is short grass, tall grass and shrub type. Vegetation zone of each channel is composed of either one type, or mosaic of tall grass and shrub type. Short grass type is common in Lake Paro and upper North Han-river where water level is highly variable throughout a year. Therefore, annual species such as Persicaria nodosa, Fimbristylis dichotomam and Chenopodium ficifolium are the most dominant. Shrub type is common at the downstream sites of Jichon stream and along mainstream of North Han River down Lake Paro. A shrub species, Salix koreensis, is the most common. Tall grass type is dominant occupying the most vegetation zone of the tributary channels. Phragmites japonica is absolutely dominant. Due to its dense cover, a few plant species are co-existed. Otter activity was found in all three vegetation types and no marked activity was found at some sites of tall grass type. There is no difference in species composition and physiognomy between tall grass sites with and without otter activity, while it shows significant difference in fish availability between two groups. Overall we found that home range of otters in the region is along the mainstream and downstream of tributary streams with high fish availability in all vegetation types and in various human activity levels.

건물의 지붕 집수면이 유출빗물의 수질에 미치는 영향

한무영,이일용,박상철 대한상하수도학회 2003 상하수도학회지 Vol.17 No.3

In order to investigate the effect of rooftop on the catchment of runoff and the possibility of using rainwater for non-drinking purpose, the water quality of rainfall and runoff were measured at a building in Seoul. This study shows the main contaminant source of roof runoff was rooftop when water quality of precipitation and roof runoff from the building were compared. The pH, turbidity, EC, metal ions and ions (anions and cations) of roof runoff increase through concrete rooftop during rainfall. However, the water quality of runoff in general is so good that they are acceptable to be used for toilet flushing, gardening, and car-washing without particular water treatments. This investigation concludes that rooftop is the essential part of rainwater systems as catchment area as well as the main contaminant source. And the water quality of rooftop runoff is suitable for non-drinking purpose. This study recommends the materials of catchment area should carefully selected and maintenance of rooftop be essential for rainwater harvesting.

바렉터 다이오드를 이용한 가변 BPF 설계 및 제작

한재권,이행수,홍성용 충남대학교 산업기술연구소 2005 산업기술연구논문집 Vol.20 No.1

This paper presents a tunable filter that can be used in front stage of UWB receiver operating under 2GHz frequency range. It presents the optimum design method of comb-line structure tunable filter keeping the fixed bandwidth and attenuation characteristic in the tunable frequency range. This filter is implemented by applying a tunable capacitor, obtained by reverse-biased varactor diode, to a capacitor used in SIR structure. As a result of tunable filter measurement, the center frequency was little moved down. Its bandwidth was almost corresponded with the result of a simulation but did not meet the given 100MHz bandwidth.

주택성능등급제에 따른 레미콘 산업의 대응방안

한천구,이건철,오상백,박용규 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.24 No.1

This study investigates the regulations on concrete grade evaluation, in response to operation of housing performance grade system(HGS). It also studies countermeasure- of ready mixed concrete industry. Because the HGS provide people who have to invest in housing once during their whole life, with objective information of housing performance, housing consumers would easily understand and purchase better house. In addition housing construction companies will try to supply the high quality housing, in response to people's various housing performance needs. It is expected that housing quality improvement and housing components technology development will be nationally activated, due to the competition on housing quality between the construction companies. After this, HGS is now on design process but will be on construction process connecting specification, which is perfoiniance based design and on the process after completion. It is assumed that those regulations will be possibly continued to develope for housing performance guarantee system.

한국산 구기자, 오미자, 갈근, 두충차 음료의 중금속 흡착율

한성희,신미경,김용욱 동아시아식생활학회 1999 동아시아식생활학회지 Vol.9 No.3

The heavy metal removability of four kinds of tea was investigated in the various conditions: particle size of tea(10, 35, 70, 100 mesh), concentration of heavy metal(25. 50, 100ppm) and extraction temperature(30, 50. 70, 100℃). The removabilities by the tea solids were increased as the particle size decreased, concentration of heavy metal increased, and extracting temperature increased. Of the four kinds of tea Pb, Cd and Cu removability by Eucommia ulmoides Oliv tea was the highest. In addition, heavy metal removability by Schizandra chinensis Baillon tea was better than that of other tea as extraction temperature was increased.

당뇨병환자에서 뇨증 Fibronectin농도의 증가에 관한 연구

한승범,조준승,손건영,서성문,박근용,조성래,박규영,박정모,이인규,여준기 啓明大學校 醫科大學 1994 계명의대학술지 Vol.13 No.4

Plasma fibronectin is an α₂-glyoprotein, which is produced by vascular endothelial cells. Raised level of plasma fibronectin has been observed in diabetic patients particularly in the presence of microvascular complications. However, no available data exist about urine level of this glycoprotein in diabetic patients. We measured urine fibronectin level by ELISA methods in 54 diabetic patients who have microvascular comlications or not. The following results were obtained. 1) Urine fibronectin level(㎍/g creatinine) in diabetic group(1740.0±678.0) is increased compaired with those in normal control group(471.0±59.0). but this results were not significantly different among two groups(P>0.05). 2) Urine fibronectin level(㎍/g creatinine) was significantly increased in patients with nephropathy (6188.0±3144.0) compared with those in normal control group(471.0±59.0) and patients without nephropathy(645.0±251.0)(P<0.001). 3) There were a significant correlation between BUN, creatinine, creatinine clearance, 24hr urine total protein and urine fibronectin level in diabetic patients. Our data suggest that urine fibronectin excretion level might be used as a sensitive guide for diabectic nephropathy.

DOC의 K-7 Mode에 의한 배기가스 저감에 관한 연구

한영출,백두성,오용석,박만재,박귀열,류규현 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3

With the significant growth of the number of vehicles, environmental problems is raised. NOx, SOx, and PM emissions in diesel powered vehicles are larger than that in gasoline, because the development of pollutants reduction techniques has no: been yet achieved. So it is need to develop after-treatment or to convert into alternative fuel to satisfy emission regula-tion. Among the after-treatment systems to reduce the diesel emissions, studies with diesel oxidation catalyst(DOC) are done greatly. In this study using DOC, reduction efficiency with the change of temperature and catalyst loading was calculated through measurements of CO, HC, PM, and SOx.

탄소섬유보강판의 홈삽입에 따른 철근콘크리트 보의 보강효과

한상훈,최만용,조홍동,박중열,황선일 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.1

This paper presents a feasibility study of an alternative strengthening method by slot-bonded CFRP plates for reinforced concrete beam. A total 14 reinforced concrete beam were constructed, tested and the response of the beams in terms of deflection, strains, failure load and failure mode were examined. Each specimen was initially loaded for 75% of ultimate load, cracked specimen were strengthened with CFRP plate and then tested until complete failure. Test variables included the strengthening method, steel ratio and strengthening length, and the effects according to each test variables are analysed. The experimental results show that proposed methods can increase the flexural strength and stiffness of the beam significantly. Also, the failure of the specimens strengthened by the proposed method are more ductile than externally bonded specimen.

수질정화용 실리케이트 다공질 담체 제조

한상목,신대용 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-

석탄회와 벤토나이트 혼합시료의 열분석 결과, 다공질체를 제조하기 위하여는 석탄회와 벤토나이트에 흡착되어 있는 흡착수의 이탈과 유기물의 연소가 완료되는 900℃이상의 열처리가 필요하였다. 벤토나이트의 첨가량과 열처리 온도가 증가함에 따라 다공질체의 미세구조가 치밀화되어 부피비중과 압축강도는 증가하였으며 흡수율과 기공률은 감소하였다. 900℃에서 2시간 열처리한 9FAIB시편의 부피비중은 1.23g/㎤, 기공률 47.5%, 흡수율 37.3% 및 압축강도 10.1MPa의 값을 나타내었으나, 1,100℃에서 2시간 열처리한 5FA5B 시편의 부피비중은 1.59g/㎤ 기공률 6.5%, 흡수율 4.5% 및 압축강도 19.3MPa의 값을 나타내었다. 본 연구에서는 아미노산의 첨가량이 증가할수록 부피비중과 압축강도는 증가하였으며 흡수율과 기공률은 감소하였다. Utilization of fly-ash by-product from coal fired power plants and classified as general waster became very important problem to solve in the environmental protection and recycling of waste materials. To investigate the possibility of large scale substitution of fly-ash as a raw materials for porous sintered materials for water-purifier, it was prepared with fly-ash and bentonite at 900-1100℃, and their physical properties were established by XRD, SEM, bulk density, porosity, water absorption and compressive strength test. The bulk density and compressive strength of the sintered bodies heat-treated at 900℃ made from 90wt% of fly-ash and 10wt% of bentonite was about 1.23g/㎤ and 15MPa. From the water absorption and porosity analysis of the sintered materials, a decrease of porosity and water absorption were observed with increasing the bentonite content in raw materials, water absorption and porosity were 37.3% and 47.5%. Pore with diameter of about 10㎛ were produced in porous sintered materials. In this study, it was shown that the porous sintered materials have a good performance of water-purifier with many pores and an adequate strength.