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국내 도입 돌비늘백합, Mercenaria mercenaria (Linnaeus, 1758) 의 분자계통학적 연구
송재희,김유철,정희도,강정하 한국패류학회 2020 The Korean Journal of Malacology Vol.36 No.4
This is the first report on the introduced foreign species Mercenaria mercenaria in Korea after being changed to a newly given Korean name (scientific name). Imports of this cultured species from China are increased rapidly for food in Korean market. In this study, for the purpose of the managing genetic resources we used CO1 and 16s rRNA universal primer for genetic classification of this species and conducted the phylogenetic analysis on the nineteen species similarly related species with M. mercenaria. The similarities with M. stimpsoni which belongs to the same genus as M. mercenaria were 90.8% (16s) and 81.7% (COI). The similarity with Meretrix petechialis was 56.6% (16s) and 75% (COI), which was relatively very low. Therefore, it is assumed that the probability of genetic disturbances with similar species is low. In the near future, M. mercernaria is expected to be used as biological resources for the mudflats on the west coast in Korea.
High-intensity focused ultrasound beam path visualization using ultrasound imaging
송재희,장진호,유양모 한국음향학회 2020 韓國音響學會誌 Vol.39 No.1
In High-Intensity Focused Ultrasound (HIFU) treatment, effective localization of HIFU focus is important for developing a safe treatment plan. While Magnetic Resonance Imaging guided HIFU (MRIgHIFU) can visualize the ultrasound path during the treatment for localizing HIFU focus, it is challenging in ultrasound imaging guided HIFU (USIgHIFU). In the present study, a real-time ultrasound beam visualization technique capable of localizing HIFU focus is presented for USIgHIFU. In the proposed method, a short pulse, with the same center frequency of an imaging ultrasound transducer below the regulated acoustic intensity (i.e., Ispta < 720 mW/cm2), was transmitted through a HIFU transducer whereupon backscattered signals were received by the imaging transducer. To visualize the HIFU beam path, the backscattered signals underwent dynamic receive focusing and subsequent echo processing. From in vitro experiments with bovine serum albumin gel phantoms, the HIFU beam path was clearly depicted with low acoustic intensity (i.e., Ispta of 94.8 mW/cm2) and the HIFU focus was successfully localized before any damages were produced. This result indicates that the proposed ultrasound beam path visualization method can be used for localizing the HIFU focus in real time while minimizing unwanted tissue damage in USIgHIFU treatment.
Synthesis of Au and Ag Nanomaterials via Proton Beam Irradiation
송재희,Jong Ryoung Park 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
We describe a synthetic route for the production of gold and silver nanocrystals via a simple proton beam irradiation process. Size-controlled gold and silver nanocrystals were prepared by just varying the duration of irradiation and the concentration of metal precursors. We observed that as the irradiation time was increased under the same current, the shape of the resulting Au nanocrystals ranged from spheres to nanorods. We also found that the size of the prepared silver nanocrystals was increased as the beam irradiation time and the concentration of AgNO3 were increased. We describe a synthetic route for the production of gold and silver nanocrystals via a simple proton beam irradiation process. Size-controlled gold and silver nanocrystals were prepared by just varying the duration of irradiation and the concentration of metal precursors. We observed that as the irradiation time was increased under the same current, the shape of the resulting Au nanocrystals ranged from spheres to nanorods. We also found that the size of the prepared silver nanocrystals was increased as the beam irradiation time and the concentration of AgNO3 were increased.