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김재한(Jae-Han Kim),김찬기(Chan-Ki Kim),이성두(Seong-Doo Lee),윤종수(Jong-Su Yoon) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
In case of connecting the weak AC system, a detailed attentions are needed. In particular, since HVDC system can control the flow of AC network freely, have to contain the range of stability and safe operation range. This paper deals with HVDC control algorithms, which are operated within 1 second on viewpoint of time domain, that is, transient stability. The target of HVDC introduced in this paper is Jindo-Cheju HVDC system, which will be operated at 2011. The introduced algorithm can be actually implemented to Jindo-Cheju HVDC system.
들깻잎과 생산환경에서 분리한 Bacillus cereus의 독소 유전자와 항생제 감수성 분석
김세리(Se-Ri Kim),이지영(Ji-Young Lee),이서현(Seo-Hyun Lee),류경열(Kyoung-Yul Ryu),박경훈(Kyeong-Hun Park),김병석(Byung-Seok Kim),윤요한(Yo-Han Yoon),심원보(Won-Bo Shim),김경열(Kyoung-Yul Kim),하상도(Sang-Do Ha),윤종철(Jong-Chul Yun) 한국식품과학회 2011 한국식품과학회지 Vol.43 No.2
본 연구는 들깻잎과 들깻잎 생산환경을 대상으로 276개의 시료를 채취하여 B. cereus를 분리 하였다. 분리된 B. cereus 200주의 toxicity를 평가하고자 독소유전자와 항생제내성을 검색하였다. 그 결과 분리된 균주에서 11개의 서로 다른 독소유전자 패턴은 확인하였으며 5개의 설사형독소와 구토형 독소를 모두 생성할 수 있는 균주는 21%였다. 가장 빈번하게 검출되는 독소유전자는 nheA(100%), enFM(100%), hblA, C, D(66.5%)였으며 EM은 가장 낮은 빈도(21.0%)로 검출되었다. 항생제 내성평가결과 분리된 대부분의 B. cereus는 18종의 항생제 중 10개의 항생제에 대해서는 감수성이었으나 β-lactam계 항생제인 penicillin(100%), ampicillin(100%), oxacillin(94.9%), amoxicillin-clavulanic acid(95.6%), cefazolin(78.2%)과 비β-lactam계 항생제 rifampicin(58.0%)에 대해서 저항성을 보이는 것으로 나타났다. 들깻잎과 들깻잎 생산환경에서 분리된 B. cereus의 독소유전자와 항생제내성 패턴은 서로 유사하였다. 따라서 본 연구결과는 들깻잎에 오염된 B. cereus에 의하여 설사형 뿐만 아니라 구토형 식중독이 발생할 가능성을 시사하며 들깻잎과 생산환경에서 항생제 저항성 B. cereus가 검출되어 의약계뿐만 아니라 농업현장에서도 항생제내성균주 출현을 예방하는 대책이 요구된다. Two-hundred Bacillus cereus isolated from perilla leaf cultivation areas in Miryang, Korea were investigated for toxin genes and antibiotic susceptibility. Toxigenic patterns of isolates were identified to be 11 groups through toxin gene profiles. 21% of strains isolated from the perilla leaves had both enterotoxin and emetic toxin. Toxin genes entFM (100%), nheA (100%) and hblA, C, D (65.5%) were frequently found in the perilla leaves, whereas EM (21.0%) was less common. Most isolates were susceptible to 10 antibiotics, but they were highly resistant to penicillin (100%), ampicillin (100%), oxacillin (94.9%), amoxicillin-clavulanic acid (95.6%), cefazolin (78.2%), and rifampicin (58.0%). These results indicate that food-borne outbreak caused by B. cereus might lead to diarrhea and emetic syndromes.
김위식 ( Wi Sik Kim ),김정 ( Jung Kim ),황두진 ( Doo Jin Hwang ),한종석 ( Jong Seok Han ),이시우 ( Si Woo Lee ),최동익 ( Dong Ik Choi ),임상민 ( Sang Min Lim ),오명주 ( Myung Joo Oh ) 한국어병학회 2012 한국어병학회지 Vol.25 No.2
Exfoliation of fouling abalone, Haliotis discus hannai from shelters by commercial oxytetracycline (OTC) was observed in culture farms. In the present study, different components of OTC for exfoliation of abalone were investigated to understand how to work. Abalone were detached from shelter in 14,000 ppm of commercial OTC (main ingredients of OTC: OTC-hydrogen chloride (HCl), 50%; glucose, 49%; blue pigment, <1%), but not below 8,000 ppm. A 95% of exfoliation rate was observed in OTC-HCl (7,000 ppm, pH 2.8) but no exfoliation in OTC-HCl (7,000 ppm, pH 5.0), glucose (7,000 ppm) or blue pigment (140 ppm). Moreover 100% exfoliation rate was observed in HCl-seawater of pH 2.8. These results indicate that HCl is the component resulting in exfoliation of the fouling abalone. Abalone was detached in HCl solution (pH 2.5-3.2) within 2 min. However, a lower pH and longer treatment resulted in delayed recovery of the detached abalone. Thus, exfoliation of fouling abalone can be achieved by a low pH treatment with cautious handling.
저탄소강의 알루미늄코팅조건에 따른 Nd:YAG 레이저 용접특성
김종도(Jong-Do Kim),이정한(Jung-Han Lee),김숙환(Sook-Hwan Kim),김기철(Ki-Chol Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Aluminized steel sheet that Al coated on low carbon steel has a excellent heat resistance, thermal reflection and corrosion resistance. It has applied to fuel tank, automotive exhaust systems, etc. Laser weldability of the aluminized steel for the full penetration welding will be described in this paper. We focused on the effect of Al coating conditions on weld strength. For these objectives, aluminized steel sheets that has various thickness and coating weight were prepared for laser welding. And then, tensile-shear and hardness test were carried out. At that same time, Al content mixed in weld after laser welding was evaluated and investigated a correlation between the mixed Al and mechanical properties. Besides, as removing partially coating layer, weldability has been investigated according to position of coating layer. As a result of this study, as increasing Al content in weld, tensile-shear strength was decreased. Also it was identified that Al of coating layer caused grain growth.
IoT센서를 이용한 고로슬래그 혼입 콘크리트의 압축강도 예측 시스템 개발에 관한 기초 연구
김한솔 ( Kim Han-sol ),장종민 ( Jang Jong-min ),민태범 ( Min Tae-beom ),이한승 ( Lee Han-seung ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1
The change of temperature and humidity in early-age concrete has a great influence on the durability of the structure. In this study, a reliable wireless sensor network system and a concrete embedded type Compressive strength prediction sensor were designed using the Arduino platform. The accuracy of the compressive strength prediction sensor was verified through a mock-up experiment, and it was confirmed that the experiment had sufficient accuracy to be used in the field environment.