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붉바리(Epinephelus akaara) 기형 발생 치어의 형태형성 유전자 발현
유진호,문성희,오현지,백혜자,이영돈,이치훈,권준영,You, Jin Ho,Mun, Seong Hee,Oh, Hyeon Ji,Baek, Hea Ja,Lee, Young-Don,Lee, Chi Hoon,Kwon, Joon Yeong 한국해양생명과학회 2019 한국해양생명과학회지 Vol.4 No.1
붉바리(Epinephelus akaara) 종자생산 시 기형 발생에 의한 손실이 크지만 기형어에 대한 생물학적 정보는 많지 않다. 본 연구에서는 부화 후 96일 붉바리 치어를 정상 그룹과 두 유형의 기형 그룹(머리, 턱)으로 나누어 형태형성과 연관된 4개의 주요 유전자(insulin like growth factor 1: IGF-1, bone morphogenic protein 4: BMP4, peroxisome proliferator-activated receptors γ: PPARγ, matrix Gla protein: MGP) 발현을 조사하였다. 각 그룹에서 뇌, 간 및 근육을 잘라낸 다음 total RNA를 추출한 후 real-time PCR을 사용하여 유전자 발현 차이를 비교하였다(n=20). 부화 후 96일 붉바리 치어에서 IGF-1과 BMP4 유전자는 기형 그룹의 뇌와 간에서 정상 그룹과 비교하여 유의한 발현 차이를 나타냈다(p<0.05). 반면에 PPARγ와 MGP 유전자는 어떤 조직에서도 정상 그룹과 기형 그룹 사이에 유의한 발현 차이를 보이지 않았다. IGF-1과 BMP4 유전자는 치어 단계의 붉바리 기형 상태와 관련되어 있는 것으로 보인다. The deformity occurring at the early developmental stage of red spotted grouper (Epinephelus akaara) causes detrimental effects on the process of juvenile production. In this study, we have compared the expressions of several key genes (insulin like growth factor 1: IGF-1, bone morphogenic protein 4: BMP4, peroxisome proliferator-activated receptors γ: PPARγ, matrix Gla protein: MGP) for morphogenesis between normal and 2 types (cephalic and jaw) of deformed juvenile fish. Expression of these genes were investigated in the brain, liver and muscle of each group of fish (n=20) by real-time PCR. Expression of IGF-1 and BMP4 mRNA in the brain and liver showed significant difference between normal and deformed fish (p<0.05). However, no difference was observed in the expression of PPARγ and MGP mRNA between normal and deformed fish in any tissues. It seems certain that IGF-1 and BMP4 are associated with the state of deformity in juvenile red spotted grouper.
토폴로지 구축을 통한 측정 오차 보정 기반의 위치인식 기법
유진호,권영구,You, Jin-Ho,Kwon, Young-Goo 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.9
무선센서 네트워크에서, 위치기반의 라우팅 알고리즘은 네트워크의 성능을 향상 시킬 수 있다. 따라서 많은 위치 추적 알고리즘이 제안되고 있다. 하지만, 실제 상황의 무선센서 네트워크에서 각각의 노드가 자신의 위치를 인지할 시 오차가 수반된다. 특히 실내 환경은 콘크리트 벽이나 가구와 같은 NLOS환경을 만드는 장해물을 가지고 있기 때문에 위치 추적 시 심각한 오차가 발생한다. 이러한 문제를 해결하기 위해서, 앵커노드로부터 얻어지는 위치정보로 구축한 토폴로지와 모바일 노드간의 연결을 가중치로 하는 MST 토폴로지 정보의 차이점을 이용해서 위치 오차를 보정하는 알고리즘을 제안한다. 제안한 알고리즘은 NLOS환경이 존재하는 네트워크에서, 위치 오차를 보정하여 위치기반 네트워크의 성능을 개선할 수 있다. In wireless sensor networks(WSNs), geographical routing algorithms can enhance the network capacity. However, in real WSNs, it is difficult for each node to know its physical location accurately. Especially, indoor environments contain various obstacles such as concrete wall, furniture which cause non-line-of-sight(NLOS) conditions. To solve the problem, we propose location error compensation algorithm by using two difference topology constructions. First topology is based on mobile node's location which is obtained from anchor nodes. Second topology is based on mutual distance from neighbor nodes. The proposed algorithm efficiently detects and corrects the location errors and significantly enhances the network performance of geographic routing in the presence of location errors.
코로나 방전 플라즈마 처리수에 의한 어류 병원체 소독 효과
유진호 ( Jin Ho You ),이지현 ( Ji Hyun Lee ),문성희 ( Seong Hee Mun ),권세련 ( Se Ryun Kwon ),박태섭 ( Tae Sup Park ),권준영 ( Joon Yeong Kwon ) 한국어병학회 2020 한국어병학회지 Vol.33 No.1
Fish culture is constantly threatened by various infectious diseases which are largely transmitted by water. Plasma technology is being used to sterilize polluted water in many industries. In this study, two bacterial pathogens Aeromonas salmonicida and Streptococcus iniae, and a virus (viral hemorrhagic septicemia virus, VHSV) were subjected to plasma water that was produced by a corona discharge system. Growth of A. salmonicida was greatly inhibited from 10<sup>5.61</sup> CFU/ml in positive control to 10<sup>3.51</sup> CFU/ml in treated group by only 60 sec contact with plasma water. Similarly, S. iniae was inhibited from 10<sup>5.85</sup> CFU/ml to 10<sup>3.40</sup> CFU/ml. VHSV titer also decreased from 10<sup>4.1</sup> TCID<sub>50</sub>/ ml to 10<sup>1.45</sup> TCID<sub>50</sub>/ml by the same treatment. Activation of water by the plasma was confirmed by the existence of ozone in the plasma water. These results suggest that plasma water could efficiently disinfect fish pathogens, possibly by the action of reactive oxygen species contained in the plasma water.
유진호(Jin ho You),최덕현(Dukhyun Choi),이상민(Sang min Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents the fabrication of zinc oxide (ZnO) nanorods with various structures by aqueous solution method (ASM) and the characterization of their optical properties. ZnO nanorods with various structures were prepared by controlling the thickness of seed layers and the temperature of main growth. We measured the array shape and growth direction of the fabricated ZnO by scanning electron microscope (SEM), and their optical properties by UV-visible spectrophotometer. We confirmed that their optical properties could be controlled by the density and diameter of ZnO nanorods. Since our strategy can be applied to flexible large-area optical electronics, it may provide a wide range of opportunities for piezoelectric energy generator and transparency solar cell.
Graphene / 구리 복합소재의 코팅을 이용한 흐름 열전달 향상에 관한 연구
유진호(You Jin Ho),최원석(Choi Won Seok),장병화(Jang ByungHwa),박찬우(Park Chan Woo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the present study, the effect of graphene coating on boiling heat transfer is being investigated under a flow of saturated R134a. Micro heater is located in the narrow channel and coated surface is attached to copper block on the heater. Cu?graphene composite martial is coated by sintering method. The boiling performance of a graphene coated surfaces are compared with those of carbon nanotubes and bare copper plate. Boiling inception occurred at a much lower heat flux and lower superheat than the others. At the nucleation process, the graphene/Cu coating sustained the best boiling performance. These trends are attributed to the effectiveness of graphene at initiating and sustaining the nucleation process. Better nucleate boiling heat transfer was also believed to result from the surface area enhancement because of an increase in the number of active nucleation sites and the presence of more small pores which are beneficial to the initiation of boiling heat transfer. In addition, graphene mesh structure provides an ideal environment for bubble nucleation. It is also believe that the high thermal conductivity of graphene assists the utilization of surface area by augmenting conduction heat transfer along the coating.