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Inhibitory effects of resveratrol on hepatitis B virus X protein-induced hepatocellular carcinoma
박승모,임지혜,김종란,조성범 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.4
Liver cancer occurs very frequently worldwide and hepatocellular carcinoma (HCC) accounts for more than 80% of total primary liver cancer cases. In this study, the anticarcinogenic effects of resveratrol against hepatitis B virus (HBV)-induced HCC were investigated by using HBV X-protein-overexpressing Huh7 (Huh7-HBx) human hepatoma cells. MTT assay showed that resveratrol decreased cell viability. Fluorescence-activated cell-sorter analysis showed that resveratrol induced G1 cell cycle arrest without increasing the sub-G1 phase cell population. Therefore, we evaluated its effect on regulation of cyclin D1, which is critically involved in G1/S transition. Resveratrol lowered cyclin D1 transcription. Western blot analysis of the effects of resveratrol on upstream cyclin D1 transcriptional signaling, extracellular signal-related kinase (ERK), p90RSK, Akt, and p70S6K revealed inhibition of Akt but not the ERK signaling pathway. Collectively, the results indicate that resveratrol inhibits Huh7-HBx proliferation by decreasing cyclin D1 expression through blockade of Akt signaling. We investigated the anticarcinogenic effect and mechanism of resveratrol in xenograft model mice implanted with Huh7-HBx cells. Intraperitoneal resveratrol injection reduced tumor size in the mice. Expression of survivin was reduced, but cyclin D1 was not affected. The results demonstrate that resveratrol treatment may help manage HBV-induced HCC by regulating survivin.
Ka-Band Radiometric Signatures of Vehicles and Land Surfaces
Ahn, Bikerng Chearl,Park, Seung Mo,Lim, Tae Wook 한국항행학회 1998 韓國航行學會論文誌 Vol.2 No.1
밀리미터파 대역의 레디오미터를 민군겸용 항공기의 시계 불량시 착륙보조장치로 활용하기 위한 연구가 최근에 활발히 진행되고 있다. 본 논문에서는 이런 관점에서 부품 구현이 비교적 용이한 Ka-대역에서 동작하는 레디오미터를 구성하고 차량과 지형물의 레디오미터 신호를 수집하고 이를 분석하였다. 측정된 신호로부터 마이크로파와 밀리미터파 대역에서 복사율이 낮은 금속차량은 주변 지형물과 확실히 구분되는 신호를 제공함으로써 레디오미터를 사용하여 쉽게 검출될 수 있음을 알 수 있었다. There have been active research efforts in the development of a dual-use millimeter-wave radiometer as an aircraft landing aid in low visibility conditions. In this paper, we constructed a radiometer operating at the Ka-band where it is relatively easy to build RF components. The radiometer is used to collect radiometric signatures of some vehicles and land surfaces. Measured signatures suggest that vehicles with metallic surfaces yield signatures markedly different from nearby land surfaces so that they can easily be detected by a simple radiometer.
직교형으로 배열된 2개의 1x2서브-어레이를 이용한 433MHz에서 동작하는 RFID 리더용 안테나 설계
김종성,박승모,최원규,성낙선,Kim Jong-Sung,Park Seung-Mo,Choi Won-Kyu,Seong Nak-Seon 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.9
본 논문에서는 433MHz에서 동작하는 RFID 리더용 직교형 안테나에 관하여 기술하였다 본 이중편파 안테나는 1x2 서브어레이를 기본으로 하여 급전회로망의 위상을 동위상 또는 반대 위상을 갖도록하여 2개 안테나의 방사체에서의 상대적인 전류 분포를 제어하여 빔 패턴에서 편파를 수직 및 수평으로 복사가 가능토록 하였다 단일 안테나는 역-에프형 구조를 이용하였으며 위상차에 따른 단락점에서부터 개방점 까지의 전류의 변화가 궁극적으로 수직 및 수평 편파가 제어되도록 하였다 이중입력에 대한 안테나의 이득은 수직 및 수평 편파에 대하여 2.7 및 0.4 dBi를 나타내었으며, 포트간 아이솔레이션은 25dB 이하의 특성을 나타내었다. An orthogonal antenna is presented for reader application of radio frequency identification (RFID) at 433 MHz. Two 1x2 sub-arrays are orthogonally placed on a ground plane and two different feeding networks are applied to control horizontal and vertical radiation current flows for each sub-array, respectively. Inverted-F structures are used as radiation elements and can generate two linear polarizations by relative current distribution of radiators forming sub-arrays. Antenna gains are 2.7 and 0.4 dBi and isolation between two input ports is less than 25dB.
全聖根,朴承模,李文秀,鄭宗哲 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1994 自動化 및 컴퓨터應用技術 Vol.1 No.1
An X-band highly frequency-stabilized MIC Gunn oscillator using a dielectric resonator is fabricated. Resonant frequency is obtained by a variational method and it is studied how the oscillating characteristics can be affected by several factors. By the optimizing these factors, we can realize the stabilized oscillator output of 250 mW with 5-7 percent efficiency at 10 GHz. It has the favorable characteristics with frequency variation of 70 KHz/℃ and the output variation within 3 dB over the temperature range from 0 to 70 ℃.
정종철,전성근,박승모,이문수 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.2
An X-band highly frequency-stabilized MIC Gunn oscillator using a dielectric resonator is fabricated. Resonant frequency is obrained by a variational method and it is studied how the oscillating characteristics can be affected by several fators. By the optimizing these factors, we can realize the stabilited oscillator output of 250 mW with 5-7 percet efficiency at 10 GHz. It has the favorable characteristics with frequency variation of 70 KHz/$^[\circ}C$ and the ouput variation within 3 dB over the temperature range from 0 to 70$^[\circ}C$.