• Molecules and Cells
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• 제43권11호
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• pp.953-963
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• 2020

Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is an infectious disease with multiple severe symptoms, such as fever over 37.5℃, cough, dyspnea, and pneumonia. In our research, microRNAs (miRNAs) binding to the genome sequences of severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory-related coronavirus (MERS-CoV), and SARS-CoV-2 were identified by bioinformatic tools. Five miRNAs (hsa-miR-15a-5p, hsa-miR-15b-5p, hsa-miR-195-5p, hsa-miR-16-5p, and hsa-miR-196a-1-3p) were found to commonly bind to SARS-CoV, MERS-CoV, and SARS-CoV-2. We also identified miRNAs that bind to receptor proteins, such as ACE2, ADAM17, and TMPRSS2, which are important for understanding the infection mechanism of SARS-CoV-2. The expression patterns of those miRNAs were examined in hamster lung samples infected by SARS-CoV-2. Five miRNAs (hsa-miR-15b-5p, hsa-miR-195-5p, hsa-miR-221-3p, hsa-miR-140-3p, and hsa-miR-422a) showed differential expression patterns in lung tissues before and after infection. Especially, hsa-miR-15b-5p and hsa-miR-195-5p showed a large difference in expression, indicating that they may potentially be diagnostic biomarkers for SARS-CoV-2 infection.

• 한국세라믹학회지
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• 제19권4호
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• pp.267-274
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• 1982

The sintering behavior and B-H loop properties of $Li_{0.5O4}$ with the addition of $Nb_2O_5$ and $V_2O_5$ have been investigated by observation of microstructures and measurement of semi-static hysteresis loops. The sintering temperature was lowered by the additions of $Nb_2O_5$ and $V_2O_5$ and the effect of $V_2O_5$ addition was greater than that of $Nb_2O_5$. The abnormal grain growth was observed at about 100$0^{\circ}C$(d:4.6g/㎤) and 85$0^{\circ}C$(d:4.5g/㎤) in the specimens with the addition of $Nb_2O_5$ and $V_2O_5$ respectively. The addition of $Nb_2O_5$ retulted in a large and uniform grain size, and the addition of $V_2O_5$ resulted in a uniform grain size but the final density was lower than that of the pure specimen. The squareness was increased and the coercive force was decreased by the addition of $Nb_2O_5$, and the squareness was decreased and the coercive force was increased by the addition of $V_2O_5$. These effects could be explained by a large and uniform grain size, and by a lower final density of specimens with the addition of $Nb_2O_5$ and $V_2O_5$ respectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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• pp.138-140
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• 2007

$TiO_2-V_2O_5$ sol was fabricated using sol-gel method and $TiO_2-V_2O_5$ thin films were fabricated using dip-coating method. $V_2O_5$ sol was added 0.01mo1e, 0.03mo1e, 0.05mo1e into $TiO_2$ sol. Viscosity of sol increased fast from about 1,000 minutes and sol began gelation from about 10,000 minutes. As a results of crystalline properties, $V_2O_5$ peaks were not found despite of $V_2O_5$ addition. Endothermic reaction occurred due to evaporation of solvent and dissociation of OH at $80^{\circ}C$. Exothermic reaction occurred due to combustion and oxidation of solvent at $230^{\circ}C$, occurred to combustion and oxidation of alkyl group at $350^{\circ}C$. Thickness of thin films increased $0.1{\sim}0.25{\mu}m$ every a dipping.

• E2M - 전기 전자와 첨단 소재
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• 제6권2호
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• pp.129-136
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• 1993

습도 감지소자의 물질 중 이온형의 대표적인 물질인 TiO$_{2}$ 습도 센서와 TiO$_{2}$에 V$_{2}$O$_{5}$를 첨가한 TiO$_{2}$-V$_{2}$O$_{5}$ 세라믹 습도센서를 제작하고 V$_{2}$O$_{5}$함량의 변화, 열처리 온도 및 열처리 시간에 따른 습도감지 특성 및 동작온도에 따른 특성 등을 조사하였으며 XRD와 SEM으로 그 원인을 규명하였다. TiO$_{2}$에 V$_{2}$O$_{5}$를 첨가하면 선형성이 좋아지는 것을 알 수 있었고 제작한 시료 중 V$_{2}$O$_{5}$의 함량이 1mol% 열처리 조건이 1000.deg.C, 1시간인 소자는 동작온도 40.deg.C에서 약 95%의 감도를 나타내었다.

• 한국조경학회지
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• 제30권1호
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• pp.87-95
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• 2002

This study was carried out to investigate the load of soil layers affected by soil depth in artificial soil alone or in blends with Loam with various ratio. The artificial soils were perlite large grain, perlite small grain, and perlite small grains blended with Loam (sand 46%, silt 40%, clay 14%) at a ratio of 8:2, 6:4, 5:5 (v/v). The soil layers were divided into a planting layer and a well-drained layer, then the weight of each layer in the air-dried state and in the field capacity were determined. The data were subjected to correlation analysis, regression analysis, and paired samples t-test. The summarized results are as follows; 1) In the air-dried state, the regression equations of the well-drained layer weight(kg/m2) in perlite large grain, planting layer weight in perlite small grain, planting layer weight in perlite small grain biended with loam(8:2, v/v), perlite small grain blended with loam(6:4, v/v), and perlite small grain blended with loam(5:5, v/v) were; 1.65824*X+0.026, 1.52292*X-0.052, 3.21468*X+0.515, 6.17549*X+ 0.083, and 6.02100*X + 33.133, respectively, where X is soil depth measured in Centimeters. 2) In the field capacity, the regression equations of the well-drained layer weight(kg/m2) in perlite large grain, planting layer weight in perlite small grain, planting layer weight in perlite small grain blended with loam(8:2, v/v), perlite small grain blended with loam(6:4, v/v), and perlite small grain blended with loam(5:5, v/v) were 5.055*X - 2.006, 7.073*X + 100.008, 8.092*X + 116.676, 10.766*X + 100.112, and 10.974*X + 124.423, respectively, where X is the soil depth measured in Centimeters. 3) All of the equations mentioned above were statistically reliable and therefore easily applicable in practical business affairs.

• 한국통신학회논문지
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• 제9권1호
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• pp.1-10
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• 1984

時分割多重化方式에 의한 Telemetry用 PCM encoder를 塔載型遠幅測定에 適合하도록 國産化開發硏究를 追究하였다. Program switch에 의하여 選擇되는 PCM encoder의 analog人力채널은 0~64word/frame($\pm$5V full scale), discrete人力은 0~30bit(5V$\pm$1V or 0V$\pm$1V dc)이며 bit rate는 70 및 140Kbit/sec, 分解能力은 8~12bit/word를 選擇할 수 있다. 그리고 filtered output code는 5次Bessel型LPF($f_{c}$=100kHz)를 통한 NRZ-L 및 Bi$\phi$=S이며 PCM encoder의 시스템誤差는 full scale에 대하여 最大 $\pm$0.2%이다.

• 월간포장계
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• 통권230호
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• pp.77-81
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• 2012

• 대한전자공학회논문지SD
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• 제49권4호
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• pp.34-42
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• 2012

본 논문에서는 무선전력전송 시스템 수신부의 넓은 입력 범위의 CMOS 다중 모드 정류기를 설계하였다. 다중 모드 정류기의 출력전압을 비교기로 감지하고, 스위치를 컨트롤 하여 정류기 모드를 전환한다. 다중 모드 정류기는 입력 전압의 크기에 따라 자동으로 전파 정류기, 1단 전압 체배기, 2단 전압 체배기로 동작한다. 일반적인 전파 정류기는 10 V에서 20 V까지의 입력 AC 전압에 대해 9 V에서 19 V까지의 출력 DC 전압을 생성할 수 있다. 다중 모드 정류기는 전파 정류기 보다 입력 범위를 5 V 향상시켜서 5 V에서 20 V까지의 입력 AC 전압에 대해 출력 DC 전압은 7.5 V에서 19 V까지 생성되는 것을 보여준다. 다중 모드 정류기의 효율은 전파 정류기 모드에서 94%이다. 제안하는 다중 모드 정류기는 0.35${\mu}m$ BCD 공정으로 설계되었고, 면적은 $2500{\mu}m{\times}1750{\mu}m$ 이다.

• 한국정밀공학회지
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• 제24권5호
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• pp.77-81
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• 2007

CATIA V5 is one of the most preferred softwares in product design for domestic and industrial use. But with the development of the IT industry, design data by CATIA V5 can easily be hacked and stolen especially via the internet and through assistance storage medium. The design data could be protected through executive, physical and technical security system. the best way to maintain confidentiality of data from unauthorized access is to have a cryptosystem of the technical security. In this paper, a cryptosystem for the protection of design data was being proposed. The memory contains the file information made by the New and Open function of CATIA V5. No error can be expected even if the file changed before of after the application of Save and Open function. A cryptosystem was constructed in CATIA V5 by inserting crypto algorithm before and after the I/O process. The encryption/decryption algorithm of each function was based on the complex cipher, which applied permutation cipher and transpose cipher. The file security system was programmed in CAA V5 and Visual C++.

• E2M - 전기 전자와 첨단 소재
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• 제9권7호
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• pp.690-695
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• 1996

We have systematically investigated the characterization of V$_{2}$O$_{5}$ thin films as a counter electrode for lithium based complementary electrochromic devices. The V$_{2}$O$_{5}$ thin films were prepared by thermal vacuum evaporation with varing the substrate temperature and film thickness. In electrochromic devices for smart windows, the WO$_{3}$ thin films with 400-800 nm thickness require to be capable of reversibly injection 10-15 mC/cm$^{2}$ of lithium, which is readily accomplished charge-balanced switching in a V$_{2}$O$_{5}$ thin films with 100-150nm thick. The V$_{2}$O$_{5}$ thin films produces considerably small changes in optical modulation properties in the visible and near infrared region(500-1100 nm) compared to the amorphous WO$_{3}$ thin films on 10-15 mC/cm$^{2}$ of lithium injection and the V$_{2}$O$_{5}$ thin films can therefore act as a counter electrode to WO$_{3}$ in a lithium based complementary clectrochromic devices. After 10$^{5}$ coloration/bleaching switching time, the degradation does not occurs and the devices exhibit a stable optical modulation in V$_{2}$O$_{5}$ thin films. It has shown that the injected lithium ion amounts in crystalline V$_{2}$O$_{5}$ thin films with the same thickness is large by 3-5 mC/cm$^{2}$ of lithium compared to the amorphous thin films in the same driving conditions. Therefore, to optimize the device performance, it is necessary to choose an appropriate film thickness and crystallinity of V$_{2}$O$_{5}$ for amorphous WO$_{3}$ film thickness as a working electrode.