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전국 주요 시장에서 시판 중인 진주담치에 함유된 마비성 패독에 관한 조사 연구
이채언,이종태,조규일,정귀원,문덕환,신해림,김공현,배기택,김용완,백낙환 인제대학교 1990 仁濟醫學 Vol.11 No.1
마비성 패독(paralytic shellfish poison)은 강력한 자연계 신경독으로 먹이연쇄를 통해 패류에 축적되며 이를 인간이나 동물이 섭취할 경우 마비성 패류 중독(paralytic shellfish poisoning)을 발생하게 된다. 마비성 패류 중독은 미국, 캐나다 및 일본 등지에서 비교적 호발하고 있으나, 우리나라의 경우 최초의 공식 보고는 1986년 4월 부산지역에서 발생된 집단 중독례로 원인 패류는 진주담치(blue mussel, Mytilus edulis)였다. 본 조사자들은 1989년 4월부터 7월까지 전국 주요 시장 38개소에서 시판 중인 진주담치를 수거하여 mouse bioassay를 이용하여 마비성 패독 함유량을 산정하였기에 보고하고자 한다. Bioassays on paralytic shellfish poison(PSP) in blue mussels(Mytilus edulis) were earned out. The subject matters were collected from 38 markets of 26 places throughout the country, during the period of April to July, 1989. At the time of collection, they were classified into two groups by their sites produced either natural or cultured. As a result, it was identified that two subject matters which were collected from markets of both Boryong and Chinhae contained PSP. The PSP toxicity scores were 47.97㎍/100gm meat in Boryong, 48.84㎍/100gm meat in Chinhae respectively, which are much lower than the level of lethal dose. Hewever it is noticeable that blue mussels in markets contained PSP, which may increase the risk of paralytic shellfish poisoning. From the view point of public health, control measures for preventing paralytic shellfish poisoning are necessary.
E ects of Film Type and Nanotopography of Wafers on Oxide CMP Characteristics
T.Katoh,B.G.Ko,J.H.Park,H.C.Yoo,J.G.Park,U.G.Paik 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.1
We investigated how the oxide lm deposition method (plasma-enhanced tetra-ethyl- orthosilicate (PETEOS) and high density plasma chemical vapor deposition (HDPCVD)) and the surface waviness of silicon wafers (nanotopography) impacted the oxide chemical-mechanical polishing (CMP) characteristics by using the lm thickness variation after CMP. We conrmed that the non-uniformity of the lm thickness after CMP clearly depended on the nanotopography and not on the lm type. We analyzed the power spectral densities of the nanotopography and the lm thickness variation after CMP. Between them, we found a clear relationship for wavelengths shorter than about 20 mm. We also showed that spectral analyses were useful techniques for quantitative interpretation of the relationship between the nanotopography and the oxide CMP characteristics.
Control of bond coat microstructure in HVOF process for thermal barrier coatings
Myoung, S.W.,Lu, Z.,Jung, Y.G.,Jang, B.K.,Paik, U. Elsevier Sequoia 2014 Surface & Coatings Technology Vol.260 No.-
The microstructure of bond coat was optimized by controlling coating parameters, such as spray distances, the gas flow ratio of air/oxygen/hydrogen, gun speed, and step distance, in high-velocity oxy-fuel process, and the effects of coating parameters on the microstructure and thermomechanical properties were investigated. When the spray distance to the substrate shortened, the microstructure became dense and the hardness values were increased. As the amount of hydrogen increased in the fixed gas flow ratio, defects such as global pores and oxides were increased and the hardness values were decreased, showing a similar trend in oxygen. The bond coat with the step distance of 8mm showed a slightly higher hardness value than that with the step distance of 5mm, indicating that the gun speed did not have much effect on the hardness value. However, in thermal diffusivity, the bond coat with the step distance of 5mm showed lower values than that with the step distance of 8mm. The optimum coating parameters could be proposed in HVOF process.
Kil, K.C.,Hong, S.G.,Park, J.O.,Pak, C.,Chang, H.,Paik, U. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.30
The pore structure and pore volume of catalyst layer (CL) were controlled by utilizing multi-walled carbon nanotube (MWCNT). According to the increase in MWCNT ratio in CL, the primary pore (below 100 nm) volume concerning with the phosphoric acid penetration to the reaction site was decreased and the secondary pore (approximately 1 μm) volume relating with oxygen gas transportation was increased, respectively. However, the excessive addition of MWCNT was detrimental to electrochemical properties due to the difficulty of phosphoric acid penetration to the reaction site and the opposite influx of phosphoric acid to the secondary pore. Furthermore, the adhesion strength between CL and gas diffusion layer (GDL) was improved by only 10% addition of MWCNT. Therefore, it is suggested that the ratio of MWCNT in CL can be key role for obtaining the optimized pore volume, enhanced adhesion strength, and good performance of polymer electrolyte membrane fuel cell (PEMFC).