석재 제품 생산 시스템을 위한 Fieldbus 기술

남부희,이철민,장태정,이재환 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-

본 연구에서는 생산 시스템에서의 통신을 위한 Fieldbus의 한 종류인 Profibus의 프로토콜을 소프트웨어적으로 구현하였다. 그리고 Profibus를 이용한 생산 시스템에서의 네트웍 구성을 위해 인터페이스 카드와 Stand-alone 보드를 설계하였다. 인터페이스 카드는 PC를 Profibus 시스템의 마스터 스테이션으로 사용할 수 있도록 설계되었으며, Stand-alone 보드는 슬레이브 스테이션으로 설계되었다. 또한 간단한 DC 모터 위치제어 플랜트를 제작하여 Profibus 프로토콜을 구현한 소프트웨어 및 하드웨어의 성능을 확인하였다. In this research, we have implemented the protocol of Profibus, a kind of Fieldbus for communication in manufacturing systems, as a software. We also have designed an interface card and a stand-alone Board to use in constructing networks for manufacturing systems. The interface card was designed to make the PC be a master station of a Profibus system and the stand-alone board was designed as a slave station. A DC motor position control system was made to test the performance and the effectiveness of the S/W and the H/W.

생물검정법을 이용한 하수슬러지 장기연용 토양의 독성평가

남재작,이승환,권순익,홍석영,임동규,고문환,송범헌 한국환경농학회 2004 한국환경농학회지 Vol.23 No.4

생물검정법에 의한 토양 내 독성평가의 유용성을 확인하기 위해 두 종류의 하수슬러지를 7년간 연용한 토양을 Microtox^(?) 생물검정법과 상추종자 뿌리 신장법을 사용하여 독성을 평가하였다. 이 방법들은 하수오니의 종류나 시용량에 따른 토양의 독성 정도를 잘 평가 할 수 있었다. 상추종자 뿌리 신장법은 특별한 장비나 복잡한 처리 없이도 유의성 있는 결과를 구할 수 있었고 Microtox^(?) 검정법은 전반적으로 재현성과 감도에서 유의성이 있었으며 또한 유기화합물에 대한 종합적인 평가도 가능하였다. 하수오니와 같이 다양한 화합물이 혼재되어 있는 유기성 자원의 토양 시용시 기존의 제한된 화학성분의 토양 분석법만으로는 독성평가에 한계가 있고 또 개별적으로는 별 영향이 없더라도 여러 화합물이 복합적으로 존재할 때 나타나는 독성작용에 대한 평가는 더욱이 어렵다. 그러므로 이러한 영향을 종합적으로 평가할 수 있는 생물검정법이 토양의 독성 평가에서 화학분석법을 보완하는 평가방법으로서의 중요성은 충분하다고 할 수 있다. 그리고 생물독성법의 유용성을 높이기 위해서는 생물검정법의 시료 추출방법 개선과 실험의 재현성을 높이기 위한 노력이 필요하리라 생각된다. 따라서 이런 생물검정법의 많은 제약에도 불구하고 환경의 종합적인 평가에 있어서 생물검정법의 중요성은 대단히 크며 직접적으로 생물을 이용하는 방법뿐만 아니라 유전독성 평가 방법 등 다양한 방법들이 환경독성 평가에 응용될 수 있을 것으로 판단된다. Bioassay was employed to assess toxicity of soil which had been treated with sewage sludges for seven years. The Microtox^(?) and root elongation test of lettuce (Lactuca Saliva) elucidated that the intensity of soil toxicity was closely related with the types and amount of sewage sludges applied. Both bioassay methods proved to be useful in an assessment of soil toxicity and were consistent to some extent with the conventional chemical analysis methods. EC_(50) values resulted from Microtox^(?) were highly correlated with concentration of heavy metals in soils amended with sewage sludges : Cu (r²= 0.86^(**)), Cr (r²= 0.84^(**)), Ni (r²= 0.83^(**)), and Zn (r²= 0.69^(**)). This demonstrated that both bioassay techniques could be employed as tools for soil toxicity assessment when the soil was exposed to solid wastes such as sewage sludge.

STS316L 용접부의 피로거동 및 초음파시럼에 의한 열화특성 평가

남기우,박소순,안석환,도재윤,박인덕 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.2

STS316L은 인성, 연성, 부식저항성 등 우수한 기계적 성질 때문에 에너지환경설비 등 구조물에 널리 이용되고 있다. 그러나, 용접구조물은 가혹한 환경하에서 경년열화가 심각하다. 지금까지의 연구들은 주로 용접부의 피로균열진전거동에 관하여 수행되었고, 피로균열진전속도식의 재료상수와 비파괴적 평가의 상관성에 관한 연구는 거의 없었다. 본 연구는 STS316L 용접부의 피로균열진전 거동을 조사하고, 초음파 파라미터로 열화특성을 평가하고 시간-주파수 분석으로 해석을 하였다. 본 연구 결과는 용접구조물의 사용기간 중 피로수명 등을 예측하기 위한 기초 데이터로서 사용될 수 있다. STS316L had been used as the structural material for energy environmental facilities, because austenite stainless steels like 316L have superior mechanical properties of which toughness, ductility, corrosion resistant and etc. However, those welded structures are receiving severe damage due to increasing of the aged degradation. Most studies until now have been carried out against fatigue bahaviors of weldments, and were not well studied on nondestructive evaluation methods. In this study, the fatigue crack propagation behavior of STS316L weldment usually used for vessels of the nuclear power plant was investigated. Also, the degradation characterstics of 316L stainless steel weldments were evaluated by the ultrasonic parameter such as ultrasonic velocity, attenuation factor and time-frequency analysis. The results of this study can be used as a basic data for the prediction of the fatigue crack life of weldments structures without disjointing or stopping service of structures in service.

나리屬의 花粉學的 觀察

辛昌男,方在旭,吳炅煥 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2

Pollen morphology of Lilium 1ancifolium L. leichtlinii var, tigrinum and L, distichum was examined by the light microscopy in conjunction differences of pollen Character in Kwangnung, The pollen character of three species was similar except the grain size, The average polar axis and equatrial axis of L,lancifolium showed the highest values among three species and L.distichum was lowest. The differences of them in three species were significant judging from the F-test (p<0.05). And the differences in size of pollen grain in three species were significant (P<0.05). It was possible for grain size to classify the pollen of species of Lilium.

특정 온도에서의 Q.C.M을 이용한 유기가스 반응 특성

김경환,진철남,최용성,박재철,권영수 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

Stearic acid was deposited on surface of 9[MHz], AT-cut quartz crystal microbalance as gas sensing material using Langmuir-Blodgett(LB) technique. We measured gas response between deposited LB films and organic gas for special temperature(0, 25, 50, 80℃). The resonant frequency changed due to absorbance of organic gas such as methanol, ethanol, propanol and butanol gas at special temperature. As a result, the resonant frequency responded to organic gas at 0, 25 [℃]. but, the resonant frequency almost not responded to organic gas at 50, 80[℃].

폴리에틸렌과 폴리프로필렌의 촉매분해

김태환,이재기,김영철,박남국,신재순 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-

Converting of wasted plastics into oil can be used as a new energy source. It has advantages of reducing the environmental problems and produces additional economic values. In this study, polyethylene and polypropylene were catalytically degraded by JSA-1(Si/Al=6.7), JSA-2 (Si/Al=2.57), HZSM-5 (Si/Al=30.2) and MCM-48(Si/Al=100/0) catalysts to investigate the optimum degradation conditions. The order in liquid product yield was JSA-2 > JSA-1 > HZSM-5. Liquid product yield was increased with the catalyst loading, but the carbon number distribution of the liquid product was widely spreaded. When the HZSM-5 was phosphated to regulate the acidity, the liquid product yield was in the order of P (2 wt %) HZSM-5 > P (1 wt %) HZSM-5 > HZSM-5 > P (3 wt %) HZSM-5. The optimum acidic amount and strength of the phosphated HZSM-5 was achieved when 2 wt % P was loaded. It was confirmed by the ammonia TPD. HMCM-48 with acid sites was not blocked by carbon deposition because of the large pore size. So, it seems to promote the catalytic activity of the plastic degradation.

보신 관광에서 감염된 수입성 Sparganosis 1예 : Intake of Thailand Snake during Trip

서환조,박명재,고경식,백영한,조유정,양현종,류경남,정형근,전정열 대한감염학회 1992 감염 Vol.24 No.1

Human sparganosois was reported more than 100 cases in Korean population. However no case reported yet in Korea as a patient was infected by sparganum from other geographical area, such as Thailand. The case we are reported here is a 38 year-old Korean male who had been suffered from mass being a small, round and soft consistance in upper portion of his right thigh. The patients stated that he had an opportunity to eat living snake in Bangkok, Thailand during trip. As therapy praziquantel (75㎎/㎏/day) was given p.o. for 14 days, but in vain to cure. Following medical treatment, surgical exicision was performed to remove a alive, soft, whitish-milky, mobile and elongated sparganum. Serlogical test by micro-ELISA for sparganum-specific antibody revealed a high serum antibody level of absorbance 0.67 (positive criterion: absorbance 0.22).

만성 화농성 중이염의 세균학적 고찰

조남순,이영훈,강기훈,최제환,송태현,이병돈,장혁순,강주원,김연준 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

Background and Objectives : Chronic suppurative otitis media is one of the frequent diseases in otolaryngologic field. It is important to choose of antibiotics in the management of infectious disease. But the organisms in infections have been changed and resistance to antibiotics has been grown as the development of antibiotics has been achieved. And so it has been necessary to recognize the changes of organisms and resistance in antibiotics. Our study was performed to identify the pathogens isolated from discharges in chronic otitis media and evaluate the antibiotic agents, to recognize the change of to resistance to·antibiotic agents and to use the appropriate anitiotics. Materials and Methods : Retrospectively, authors reviewed the backeriologic study of 114 cases of chronic suppurative otitis media who visited the Department of Otolaryngology, Soonchunhyang University in Seoul from Nov. 1996 to Oct. 1999 and analyzed 101 strains and its sensitivity test to various antibiotics. Result : In 93 cases in which pathogenic organism was isolated, single infection was 85 cases(91.4%) and mixed infection was 8 cases(8.6%). The most frequent pathogenic organism was Staphylococcus aureus(59.4%), Pseudomonas aeruginosa(13.9%), Providencia(4.8%), Alcaligenes(3.0%) and Streptococcus pneumoniae(2.9%) were the next. Methicilline-Resistance Staphylococcus aureus was 34 cases(57.6%) of Staphylococcus aureus. Staphylococcus aureus was sensitive to Vancomycin(96.7%), Trimethoprim-Sulfamethoxazole (57.6%), Cefuroxime(42.4%) and Ciprofloxacin(40.7%) but resistant to Penicillin(94.9%). Pseudomonas aeruginosa was sentitive Amikacin(100%), Ciprofloxacin(100%) and Gentamicin(67%). Conclusion : As MRSA recently was wide spread in community accquired infection as well as nosocomial infection, we must consider strict control of MRSA.

잎담배 生産과 栽培環境과의 關係에 關한 解析的 硏究 : 第十二報 移植 및 被覆方法이 잎의 形質에 미치는 影響 VII. Influence of Planting and mulching Mathods on the Leaf Characteristics of Flue-cured Tobacco

盧載榮,南基桓,李鶴洙 충북대학교 엽연초연구소 1978 煙草硏究 Vol.5 No.-

This experiment was conducted to study the effect of planting and mulching methods on the some characteristics of the flue-cured tobacco leaf. The results obtained are summerized as fellows. 1.Plant type was changed according to planting time and mulching methods. As the plant type of early plating and mulching plot was changed to conical shape, so the light condition received of the plot was improved. 2.As the weight of unit leaf area and percentage of dry matter were high and dried up leaf ratio, leaf area contraction ratio and proportion of midrib were low in earley setting plot, so the leaf quality was good. But weight of a leaf and LAI were small. 3.In the view of leaf quality among the diffent leaf position, the lower and middle leaves of the non-temporary planting plot were especially good. 4.To increase the yield and to improve the leaf quality, it seems desirable to improve the leaf quality by early setting and to increase LAI by increasing the number of leaves.

인성교육의 회고와 전망

염재철,이남인,이창환 서울大學校 人文學硏究所 1998 人文論叢 Vol.39 No.-