Low-voltage driving phototransistor based on dye-sensitized nanocrystalline titanium dioxide thin films

Xiaoqi Wang,Jia Xu,Zhiyong Liu,Yuming Lu,Chuanbing Cai 한국물리학회 2012 Current Applied Physics Vol.12 No.1

Photo-gated transistors based on dye-sensitized nanocrystalline titanium dioxide thin film are established. A transistor-like transport behavior characterized by the linear increase, saturated plateau, and breakdown-like increase in the voltageecurrent curve is achievable with a low driven bias for the present device. The response current exhibits a linear dependence on the intensity of gated light, and the measured maximum photosensitivity is approximately 0.1 A/W. The dynamic responses for various light frequencies and their dependences on the load resistances are investigated as well. The cut-off frequency of w50 Hz is abstracted, indicating the potential application for economical and efficient light switch or optical communication unit. The DC photo-gated response is explained by the energy level diagram, and is numerically simulated by an equivalent circuit model, suggesting a clear correlation between photovoltaic and photoconductive behaviors as well as their optical responses. Photo-gated transistors based on dye-sensitized nanocrystalline titanium dioxide thin film are established. A transistor-like transport behavior characterized by the linear increase, saturated plateau, and breakdown-like increase in the voltageecurrent curve is achievable with a low driven bias for the present device. The response current exhibits a linear dependence on the intensity of gated light, and the measured maximum photosensitivity is approximately 0.1 A/W. The dynamic responses for various light frequencies and their dependences on the load resistances are investigated as well. The cut-off frequency of w50 Hz is abstracted, indicating the potential application for economical and efficient light switch or optical communication unit. The DC photo-gated response is explained by the energy level diagram, and is numerically simulated by an equivalent circuit model, suggesting a clear correlation between photovoltaic and photoconductive behaviors as well as their optical responses.

Secrecy Performance of Multi-Antenna Satellite-Terrestrial Relay Networks with Jamming in the Presence of Spatial Eavesdroppers

Xiaoqi Wang,Zheng Hou,Hanwei Zhang 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.9

This work investigates the physical layer secrecy of a multi-antenna hybrid satellite-terrestrial relay networks (HSTRN) with jamming, in which a satellite aims to make communication with a destination user by means of a relay, along with spatially random eavesdroppers. In order to weaken the signals of eavesdroppers, the conventional relay can also generate intentional interference, besides forwarding the received signal. Shadowed-Rician fading is adopted in satellite link, while Rayleigh fading is adopted in terrestrial link, eavesdropper link and jamming link. The analytical and asymptotic formulas for the system secrecy outage probability (SOP) are characterized. Practical insights on the diversity order of the network are revealed according to the asymptotic behavior of SOP at high signal-to-noise ratio (SNR) regime. Then, analysis of the system throughput is examined to assess the secrecy performance. In the end, numerical simulation results are presented to validate the theoretical analysis and point out: (1) The secrecy performance of the considered network is affected by the channel fading scenario, the system configuration; (2) Decrease of the relay coverage airspace can provide better SOP performance; (3) Jamming from the relay can improve secrecy performance without additional network resources.

Power Distance in Hofstede and GLOBE

Peng Wang(왕붕),XiaoQi Wang(왕효기),Jing Xu(서경),Jong-Wook Kwon(권종욱) 충남대학교 경영경제연구소 2019 경영경제연구 Vol.41 No.4

본 논문의 목적은 Hofstede와 GLOBE의 권력거리 문화차원의 유사점과 차이점을 분석해보는 것이다. Hofstede와 GLOBE의 권력거리 문화차원은 동일한 문화차원으로 알려져 있지만 측정방법, 측정문항 등이 상이하여 이 두 가지 차원이 동일한 것을 간주해야 하는지 아니면 상이한 것인지 혼란스러운 상황이다. 따라서 Hofstede와 GLOBE의 권력거리 문화차원을 개념, 정의, 구조 차원에서 분석하였다. 분석결과 이 두 가지 차원은 유사성도 있지만 상이성도 있음을 발견하였다. 따라서 연구자들은 결과변수에 따라서 적절하게 선택해서 사용할 필요성이 있음을 확인하였다. The purpose of this paper is to critically examine the similarities and differences between Hofstede’s and GLOBE’s Power Distances using theoretical and empirical analyses. The Hofstede PDI (Power Distance Index) and the GLOBE PD (Power Distance) are analyzed in terms of their concepts, definitions, structures and validity. Next, the relationship between the Hofstede PDI and GLOBE PD is empirically studied. We find that the Hofstede PDI and GLOBE PD are different in their measurements of the cultural dimension. However, the Hofstede PDI and GLOBE PDP (Power Distance Practices) have certain similarities when comparing external variables, while the GLOBE PDV (Power Distance Values) does not. The limitation is that our research data are based on secondary data from Hofstede and GLOBE. The data sources will correspondingly limit the research. Therefore, researchers should carefully select the Hofstede or GLOBE scores that are most suitable for their own research according to the true meaning and purpose of their research, which will allow researchers to more clearly, more accurately and more logically explain national cultures

Circ‑NT5C2 stimulates FZD4 expression to promote the malignant progression of osteosarcoma by targeting miR‑488‑3p

Yang Xiaoqi,Wang Shuhua,Zhang Xianjun,Gao Xiangbin,Xu Pengfei 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.5

Background: Circ-NT5C2 has been confirmed to be highly expressed and associated to the progression of osteosarcoma (OS). However, the behind mechanism of circ-NT5C2 involvement in OS remains unclear. Methods: The expression of circ-NT5C2, miR-488-3p and FZD4 was measured by quantitative real-time PCR, and the protein expression of E-cadherin, N-cadherin and FZD4 was detected by western blot. Cell counting kit 8 assay, colony formation assay and 5-ethynyl-2-deoxyuridine assay were performed to assess the cell proliferation. The cell apoptosis was measured by flow cytometry and Caspase3/Caspase9 Activity Assay Kits. Cell migration and invasion were detected by transwell assay. Dual-luciferase reporter assay and RIP assay were carried out to determine the binding relation among circ-NT5C2, miR-488-3p and FZD4. Animal experiment and immunohistochemistry analysis were conducted to explore the role of circ-NT5C2 in tumor growth in vivo. Results: Comparing with controls, the expression of circ-NT5C2 and FZD4 was upregulated and miR-488-3p expression was downregulated in OS tumor tissues and cells. Circ-NT5C2 overexpression facilitated the cell proliferation and motility and induced cell apoptosis of OS cells, whereas circ-NT5C2 knockdown had the opposite effect. Besides, we also found and confirmed that circ-NT5C2 regulated cell malignant behaviors via modulating miR-488-3p/FZD4 axis in OS. Moreover, circ-NT5C2 silencing repressed the growth of xenografts in vivo. Conclusion: Circ-NT5C2 upregulated FZD4 expression via sponging miR-488-3p, thus facilitating cell malignant behaviors in OS.

Survey on robotics and automation technologies for civil infrastructure

명현,Yang Wang,Shih-Chung Jessy Kang,XiaoQi Chen 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.6

Over the past several decades, substantial amounts of sensors and sensing systems have beendeveloped for civil infrastructure systems. This special issue focuses on state-of-the-art robotics andautomation technologies, including construction automation, robotics, instrumentation, monitoring,inspection, control, and rehabilitation for civil infrastructure. The issue also covers construction informaticssupporting sensing, analysis and design activities needed to operate smart and sustainable civil infrastructure. Examples include robotic systems applied to civil infrastructure and equipped with various sensingtechnologies, such as optical sensors, laser sensors, wireless sensors, multi-sensor fusion, etc. This specialissue is published in an effort to disseminate current advances of various robotics and automationtechnologies for civil infrastructure and built environment.

Construction of graphene/AuNPs based amperometric immunosensor for detecting bladder cancer biomarker apolipoprotein A1

Jing Yang,Wang Xingyuan,Zhou Tingting,Wei Liangjun,Guo Meiling,Liu Yanan,Sun Xiaoqi,Wang Yanjie 한국탄소학회 2024 Carbon Letters Vol.34 No.3

This paper presents the construction and characterization of an amperometric immunosensor based on the graphene/gold nanoparticles (AuNPs/GO) nanocomposite for the detection of the bladder cancer biomarker, apolipoprotein A1 (Apo-A1). The morphological analysis of the AuNPs/GO nanocomposite demonstrated an almost spherical shape of AuNPs and the successful coverage of their surface by graphene oxide. An increased G peak and decreased D peak after the association of AuNPs with GO, implied a reduction in graphene defects. The X-ray photoelectron spectroscopy (XPS) indicated a significant decrease in the quantity of oxygen-containing functional groups in the AuNPs/GO nanocomposite, as compared to the original GO. Furthermore, the developed sensor demonstrated commendable sensitivity and selectivity, with a wide linear range for Apo-A1 detection. Importantly, the immunosensor exhibited remarkable stability over a period of 14 days, signifying its potential for practical applications.

Survey on robotics and automation technologies for civil infrastructure

Myung, Hyun,Wang, Yang,Kang, Shih-Chung Jessy,Chen, XiaoQi Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.6

Over the past several decades, substantial amounts of sensors and sensing systems have been developed for civil infrastructure systems. This special issue focuses on state-of-the-art robotics and automation technologies, including construction automation, robotics, instrumentation, monitoring, inspection, control, and rehabilitation for civil infrastructure. The issue also covers construction informatics supporting sensing, analysis and design activities needed to operate smart and sustainable civil infrastructure. Examples include robotic systems applied to civil infrastructure and equipped with various sensing technologies, such as optical sensors, laser sensors, wireless sensors, multi-sensor fusion, etc. This special issue is published in an effort to disseminate current advances of various robotics and automation technologies for civil infrastructure and built environment.

Origin of Giant Saturation Magnetization in Fe₁₆N₂" : a 40-year Mystery of Magnetic Materials

Jian-Ping Wang,Nian Ji,Xiaoqi Liu,Yunhao Xu,C. S?nchez-Hanke,F.M.F. de Groot 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Comparison and analysis on sheep meat quality and flavor under pasture-based fattening contrast to intensive pasture-based feeding system

Zhang Zhichao,Wang Xiaoqi,Jin Yan,Zhao Kai,Duan Ziyuan 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.7

Objective: The objective of this study was to investigate the effect of 4-month intensive feeding on the meat quality, fatty acid profile, flavor, and growth performance of grazing Hulunbuir sheep (HBS). Methods: The HBS were selected 4-months after birth in a pasture rearing system as the experimental animals (n = 44, female, average body weight 23.8±2.2 kg) then divided equally into pasture-based grazing fattening (PAS) and concentrate-included intensive fattening (CON) groups for another 4-month finishing. When finished fattening, all animals were slaughtered to collect musculus longissimus dorsi subcutaneous adipose tissue and to investigate the influences on meat quality, fatty acid profile, flavor and growth performance. Results: The results showed lambs in CON group got significantly higher live weight, hot carcass weight, and dressing percentage. The CON group had significantly higher value of redness (a*), lightness (L*) and water holding capacity (p<0.05), significantly lower value of Warner-Bratzler shear force than the PAS group (p<0.05). The subcutaneous fat from CON group lambs demonstrated a significantly higher content of C18:1 and C18:2 (p<0.05), but lower C14:0 and C16:0, indicating an increased degree of unsaturated fatty acid. The content of 4-methyloctanoic acid, 4-ethyloctanoic acid and 4-methylnonanoic acid had increased 2 to 4 times, representing a more intense odor in the CON group. However, the values were still lower than most sheep breeds reported, indicating the indoor feeding system could not fundamentally deteriorate the excellent meat characteristic of HBS. Conclusion: It was evident that lambs in CON group exhibited a better meat production performance, improved in meat color, texture and healthier fatty acid profile through pastureweaned concentrate included intensive fattening system, which offers a good alternative regimen for lamb finishing and has a wide prospection in the HBS meat industry. Objective: The objective of this study was to investigate the effect of 4-month intensive feeding on the meat quality, fatty acid profile, flavor, and growth performance of grazing Hulunbuir sheep (HBS).Methods: The HBS were selected 4-months after birth in a pasture rearing system as the experimental animals (n = 44, female, average body weight 23.8±2.2 kg) then divided equally into pasture-based grazing fattening (PAS) and concentrate-included intensive fattening (CON) groups for another 4-month finishing. When finished fattening, all animals were slaughtered to collect musculus longissimus dorsi subcutaneous adipose tissue and to investigate the influences on meat quality, fatty acid profile, flavor and growth performance.Results: The results showed lambs in CON group got significantly higher live weight, hot carcass weight, and dressing percentage. The CON group had significantly higher value of redness (a*), lightness (L*) and water holding capacity (p<0.05), significantly lower value of Warner-Bratzler shear force than the PAS group (p<0.05). The subcutaneous fat from CON group lambs demonstrated a significantly higher content of C18:1 and C18:2 (p<0.05), but lower C14:0 and C16:0, indicating an increased degree of unsaturated fatty acid. The content of 4-methyloctanoic acid, 4-ethyloctanoic acid and 4-methylnonanoic acid had increased 2 to 4 times, representing a more intense odor in the CON group. However, the values were still lower than most sheep breeds reported, indicating the indoor feeding system could not fundamentally deteriorate the excellent meat characteristic of HBS.Conclusion: It was evident that lambs in CON group exhibited a better meat production performance, improved in meat color, texture and healthier fatty acid profile through pastureweaned concentrate included intensive fattening system, which offers a good alternative regimen for lamb finishing and has a wide prospection in the HBS meat industry.

Alkylation of phenol with tert-butyl alcohol over zirconium incorporated mesoporous molecular sieves with enhanced acidity

Qian Zhao,Qian Wang,Duolin Wu,Xiaoqi Fu,Tingshun Jiang,Hengbo Yin 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4

Several SO42-/Zr-MCM-41 and SO42-/Zr-MCM-48 solid acid catalysts were prepared by wet impregnation method and were characterized by FT-IR, XRD, NH3-TPD and N2 physical adsorption,respectively. The catalytic activities of these catalysts were evaluated in alkylation reaction of phenol and tert-butyl alcohol. Experimental results reveal that the four solid acid catalysts still maintained a typical mesoporous framework. Under comparable condition, the SO42-/Zr-MCM-48-25 catalyst exhibits much high catalytic activity and gives the highest phenol conversion as compared with the other catalysts. A maximum phenol conversion of 91.6% with 81.8% selectivity to 4-tert-butylphenol (4-TBP) was achieved at the reaction temperature of 140 8C. 2012 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.