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한국 대표식단 중의 중금속 섭취 총량에 대한 위해도 평가
권영택,이정아 경남대학교 환경문제연구소 2001 환경연구 Vol.24 No.-
Dietary intake of heavy metals by Korean Foods was estimated by means of total diet study analyzing typical diets prepared in 6 different regions of South Korea. The mean intake of metals(㎍/kg b.w./week) by Korean Foods was 20.9 As, 3,2 Cd, 0.41 Hg, and 21.2 Pb et al, respectively. The risk index in precent ratio of dietary intake to provisional tolerable weekly intake(PTWI) was computed on the basis of nationwide average values and showed 6~8% level in As, Hg and 45~85% in Cd, Pb all of which were below the toxicological standard PTWI proposed by FAO/WHO. However, diets suspecious of contamination far outlying the average intake were observed in cases of As and Hg in some regions, whereas Cd and Pb levels having the normal distribution exceeded the PTWI if the maximum intake was considered.
국중민,임언택,권택용,최병기 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1
본 논문은 서로 다른 재료를 표면활성화법을 이용하여 저온에서 접합할 목적으로 이들 재료의 접합 가능성을 검토하고 이들 접합계면에서의 접합 메카니즘을 검토할 목적으로 연구하였으며 연구 결과는 다음과 같다. 1) 10-7 Torr대의 진공도에서도 알루미늄은 알루미나, 질화 알루미늄, 질화규소, 지르코늄 등의 세라믹스와 양호한 접합이 가능하였다. 2) 알루미늄, 동, 은은 같은 금속끼리의 접합이 가능하고, 또 알루미늄과 동의 이종재료의 접합도 가능하였다. 3) 실리콘은 알루미늄, 동, 은, 금 등의 실험결과 모든 금속과 접합이 가능하였다. In this paper considered it possible to bone different materials in low temperature using surface activated method. To do so, It was examined the possibility of bonding different materials and applied the bonding mechanism on the bonding surface. The followings are the result. 1) It was possible that Aluminum could be bonded well with ceramics such as alumina, nitrification aluminum, nitrification silicon, and zirconium at the vaccum level of 10-7 Torr. 2) It was possible that aluminum, copper, and copper could be bonded with each other and aluminum and copper could be bonded with other metals. 3) Silicon was bonded with aluminum copper silver, and gold which were tested before.
최병기,권택용,정환규 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
SS41 is welded automatically and is investigated some effects of the welding residual stress in the growth and propagation of fatigue crack, so as to study the fatigue behaviour in the welding residual stress field. The summarized results are as follows; 1) In case of the load range is constant, as the stress ratio is changing to 0.1, 0.33 and 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life. 2) It was shown that the fatigue crack propagation ratio da/dN was almost constant regardless of the stress ratio change at constant load amplitude and that the larger stress ratio, the slower was the fatigue crack propagation ratio. 3) The opening ratio U is influenced by Kmax but it isn't only the function of Kmax because data range is very large. 4) The growing and propagation fatigue crack in the welding residual stress field is similar to original specimen after passing the original residual stress field.
최병기,국중민,장경천,권택용 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
본 연구에서는 원자력 발전소의 터빈장치에 사용되는 순수티타늄 용접재의 피로수명과 크랙성장속도 등을 열영향부, 용접부 그리고 모재부를 각각 비교하기 위하여 시험편을 크게 용접된 4개의 시험편(Specimen1∼4 ; 초기노치에서 2∼3mm 떨어진 부분이 각각 H.A.Z, 본드부, 용접부, 모재부 등에 위치함)과 모재 시험편으로 나누어 피로시험을 수행한 결과 다음과 같은 결론을 얻을 수 있었다. 1) 순수티타늄 용접재 중 Specimen-2가 모재 시험편에 비해 피로수명이 약 700%로 가장 크게 나타났다. 2) 초기 크랙이 1mm로 성장하는데 걸리는 평균 크랙진전속도를 조사한 결과 Specimen-2가 모재에 비하여 약 30배로 가장 낮은 크랙진전속도를 나타내고 있었으며, 초기 크랙진전속도가 최종 파단 수명에 매우 큰 영향을 미치고 있음을 알 수 있었다. 3) 시험편 중 피로수명이 가장 큰 Specimen-2 시험편은 노치 선단으로부터 H.A.Z까지 거리가 약 6.7mm로 전체 파단길이의 약 25%를 차지하고 있었다. 4) da/dN과 ΔK를 고찰한 결과 용접으로 인해 생긴 두 개의 기울기로 인하여 Paris 법칙에 적용하기에는 부적당함을 알 수 있었다. In this study, Specimens were classified four welded specimens and a base metal to investigate fatigue life and crack growth rate of pure titanium welding materials, and Ti was used in turbine equipment of nuclear power generation, etc. The summarized results are as follows ; 1) Specimen-2 was bigger 712% than base metal, when it was compared with other welding materials. 2) As the result of specimens data. Specimen-2 crack Behavior rate was lower 30 times than base metal, and so total fracture life was very influenced by it 3) Notch tip of Specimen-2 was offsetted 6.7mm from boundary H.A.Z, and it formed 25% in total fracture length. 4) As the considering of da/dN and ΔK, Paris' law is incongruous in this study, because two inclines were on one date.
Kwon, Jung-Hoon,Noh, Yun Kyung,Lee, Dong-Hun,Yuk, Seong-Su,Erdene-Ochir, Tseren-Ochir,Noh, Jin-Yong,Hong, Woo-Tack,Jeong, Jei-Hyun,Jeong, Sol,Gwon, Gyeong-Bin,Song, Chang-Seon,Nahm, Sang-Soep Elsevier 2017 Veterinary microbiology Vol.203 No.-
<P><B>Abstract</B></P> <P>Wild birds play a major role in the evolution, maintenance, and dissemination of highly pathogenic avian influenza viruses (HPAIV). Sub-clinical infection with HPAI in resident wild birds could be a source of dissemination of HPAIV and continuous outbreaks. In this study, the pathogenicity and infectivity of two strains of H5N8 clade 2.3.4.4 virus were evaluated in the Mandarin duck (<I>Aix galericulata</I>) and domestic pigeon (<I>Columba livia domestica</I>). None of the birds experimentally infected with H5N8 viruses showed clinical signs or mortality. The H5N8 viruses efficiently replicated in the virus-inoculated Mandarin ducks and transmitted to co-housed Mandarin ducks. Although relatively high levels of viral shedding were noted in pigeons, viral shedding was not detected in some of the pigeons and the shedding period was relatively short. Furthermore, the infection was not transmitted to co-housed pigeons. Immunohistochemical examination revealed the presence of HPAIV in multiple organs of the infected birds. Histopathological evaluation showed the presence of inflammatory responses primarily in HPAIV-positive organs. Our results indicate that Mandarin ducks and pigeons can be infected with H5N8 HPAIV without exhibiting clinical signs; thus, they may be potential healthy reservoirs of the H5N8 HPAIV.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mandarin ducks and pigeons can be infected with H5N8 HPAI viruses without exhibiting clinical signs. </LI> <LI> The titer of excreted virus was relatively high in a Mandarin duck and was detected in multiple organs. </LI> <LI> Mandarin ducks and pigeons may be potential healthy reservoirs of the H5N8 HPAI virus. </LI> </UL> </P>
Kwon, Jung-Hoon,Kim, Ji-Hoon,Lee, Dong-hun,Cho, Hyunseok,Hwang, Seung-Yong,Yuk, Seong-Su,Erdene-Ochir, Tseren-Ochir,Noh, Jin-Yong,Hong, Woo-Tack,Jeong, Jei-Hyun,Jeong, Sol,Gwon, Gyeong-Bin,Lee, Sang-W 대한미생물학회 2016 Journal of Bacteriology and Virology Vol.46 No.1
Asian-lineage H5 highly pathogenic avian influenza (HPAI) viruses have caused continuous outbreaks in poultry and wild birds. Development of rapid and accurate diagnostic methods is needed for preventing further spread of the virus and reducing the time required for eradication of the virus. We developed a low-density microarray for the rapid detection and identification of avian influenza virus subtypes H5, H7, and H9 and their pathotypes in a previous study. In the present study, we evaluated previously developed diagnostic microarray using avian influenza viruses isolated in Mongolia, including H5 HPAI viruses. All H5 HPAI viruses isolated in Mongolia were shown as H5-specific and highly pathogenic pattern in the microarray. H2, H3 and H12 viruses isolated in Mongolia used in this study did not show any H5, H7 and H9 patterns. These results indicated that this diagnostic microarray has enormous potential for the rapid subtyping and pathotyping of influenza viruses, including viruses isolated in Mongolia.
Reassortant Clade 2.3.4.4 Avian Influenza A(H5N6) Virus in a Wild Mandarin Duck, South Korea, 2016
Kwon, Jung-Hoon,Lee, Dong-Hun,Swayne, David E.,Noh, Jin-Yong,Yuk, Seong-Su,Erdene-Ochir, Tseren-Ochir,Hong, Woo-Tack,Jeong, Jei-Hyun,Jeong, Sol,Gwon, Gyeong-Bin,Lee, Seok,Song, Chang-Seon U.S. Department of Health and Human Services * Cen 2017 Emerging Infectious Diseases Vol.23 No.5
<P>A reassortant clade 2.3.4.4 avian influenza A(H5N6) virus was isolated from a fecal sample of a Mandarin duck (<I>Aix galericulata</I>) in South Korea during October 2016. This virus was genetically similar to H5N6 subtype virus isolates from China, Vietnam, Laos, and Hong Kong, including human isolates.</P>