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The Physical Layer Security Beamforming Method based on Large-scale Multi-antenna
Zhou Wen-gang,Li Jing,Guo Hui-ling 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.7
Network security with encryption and decryption technology to complete the application layer, but this technology will bring computing resources and a waste of energy, particularly in these two resources are limited wireless communication system for this problem, we use a large-scale multi-antenna technology, using beamforming algorithm in power and spectrum limited conditions, to maximize the mutual information system security, the simulation results demonstrate the ability to secure transmission algorithms can effectively improve the system.
Assessment of the crest cracks of the Pubugou rockfill dam based on parameters back analysis
Zhou, Wei,Li, Shao-Lin,Ma, Gang,Chang, Xiao-Lin,Cheng, Yong-Gang,Ma, Xing Techno-Press 2016 Geomechanics & engineering Vol.11 No.4
The crest of the Pubugou central core rockfill dam (CCRD) cracked in the first and second impounding periods. To evaluate the safety of the Pubugou CCRD, an inversion analysis of the constitutive model parameters for rockfill materials is performed based on the in situ deformation monitoring data. The aim of this work is to truly reflect the deformation state of the Pubugou CCRD and determine the causes of the dam crest cracks. A novel real-coded genetic algorithm based upon the differences in gene fragments (DGFX) is proposed. It is used in combination with the radial based function neural network (RBFNN) to perform the parameters back analysis. The simulated settlements show good agreements with the monitoring data, illustrating that the back analysis is reasonable and accurate. Furthermore, the deformation gradient of the dam crest has been analysed. The dam crest has a great possibility of cracking due to the uncoordinated deformation, which agrees well with the field investigation. The deformation gradient decreases to the value lower than the critical one and reaches a stable state after the second full reservoir.
An Investigation into the Prevalence of Voice Strain in Chinese University Teachers
( Gang Zhou ),( Xiao Chun Niu ) 범태평양 응용언어학회 2015 Journal of Pan-Pacific Association of Applied Ling Vol.19 No.1
Vocal disorders are very common occupation-related disease in teachers, though it has never been given enough attention in China. As a result, the occupational health care of professional voice users is surprisingly undeveloped compared to the attention given to occupational hearing disorders or many other occupational symptoms. The aim of the present study was to assess the prevalence of voice problems in the general population of Chinese university teachers, and explore whether their voice problems affected their daily life, their social life and their work. A voice strain and voice handicap index questionnaire was administered to university instructors of English (N = 156) in six Chinese universities. Results indicated that voice strain is prevalent among Chinese university instructors. The respondents`` self-perceptions revealed that voice strain was significantly correlated with their job and their daily activities.
Gang Zhou,Yu-Bao Li,Soo-Wohn Lee 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
A Nano-hydroxyapatite (n-HA)/chitosan (CS)/konjac glucomannan (KGM) composite was prepared by integrating composition and molding. Then, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to analyze the physical, chemical and degradable properties of the composite before and after immersion in simulated body fluid (SBF). Moreover, an in vitro test for drug delivery revealed that the amount of released pentoxifylline (1-[5-oxohexyl]-3, 7-dimethylxanthine)(PTX) reached a plateau and equaled 80% of the drug loaded in an implant. The newly developed n-HA/CS/KGM composite may serve as a good degradable biomaterial for an implantable drug delivery system (IDDS) in bone tissue engineering. A Nano-hydroxyapatite (n-HA)/chitosan (CS)/konjac glucomannan (KGM) composite was prepared by integrating composition and molding. Then, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to analyze the physical, chemical and degradable properties of the composite before and after immersion in simulated body fluid (SBF). Moreover, an in vitro test for drug delivery revealed that the amount of released pentoxifylline (1-[5-oxohexyl]-3, 7-dimethylxanthine)(PTX) reached a plateau and equaled 80% of the drug loaded in an implant. The newly developed n-HA/CS/KGM composite may serve as a good degradable biomaterial for an implantable drug delivery system (IDDS) in bone tissue engineering.
( Zhou Zhou ),( Dong Hai Peng ),( Jin Shui Zheng ),( Gang Guo ),( Long Jun Tian ),( Zi Niu Yu ),( Ming Sun ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.5
We screened four B. thuringiensis strains whose parasporal inclusions contained the S-layer protein (SLP), and cloned two slp genes from each strain. Phylogenetic analysis indicated these SLPs could be divided into two groups, SLP1s and SLP2s. To confirm whether SLPs were present in the S-layer or as a parasporal inclusion, strains CTC and BMB1152 were chosen for further study. Western blots with isolated S-layer proteins from strains CTC and BMB1152 in the vegetative phase showed that SLP1s and SLP2s were constituents of the S-layer. Immunofluorescence utilizing spore-inclusion mixtures of strains CTC and BMB1152 in the sporulation phase showed that SLP1s and SLP2s were also constituents of parasporal inclusions. When heterogeneously expressed in the crystal negative strain BMB171, four SLPs from strains CTC and BMB1152 could also form parasporal inclusions. This temporal and spatial expression is not an occasional phenomenon but ubiquitous in B. thuringiensis strains. [BMB reports 2011; 44(5): 323-328]
Gang Zhou,Cunmin Wang,Qi Wang,Yixin Xu,Zhanyi Xing,Baoyong Zhang,Cuicui Xu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
In the process of coal seam water injection, the components of different fracturing fluids have differenteffects on coal. To analyze the effect of water injection fracturing fluid on the physical and chemical propertiesof coal, we studied the relationship between guar-based fracturing fluid and cationic clean fracturingfluid (C-VES). Microscopic experiments show that guar-based fracturing fluid has a certain viscosityeffect on coal, while C-VES can adsorb and capture the primary coal dust in coal. FTIR analysis shows thatC-VES has a great change on the content of coal functional groups, and guar-based fracturing fluid haslittle effect on coal. Industrial analysis shows that C-VES can better reduce the ash content of coal andhas a certain impact on the thermal efficiency of coal than guar based fracturing fluid. Combustion characteristicexperiment shows that guar-based fracturing fluid does not affect the combustion effect of coal,and C-VES can expand the exothermic temperature range of coal but has little effect on the main combustionof coal. Molecular dynamics simulation results show that C-VES has the best wetting effect oncoal. This research provides theoretical guidance for dust prevention and improving the use and conversionefficiency of coal.
( Gang Zhou ),( Long Jie Li ),( Qing Shan Shi ),( You Sheng Ouyang ),( Yi Ben Chen ),( Wen Feng Hu ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.12
Citrobacter sp. is a cause of significant opportunistic nosocomial infection and is frequently found in human and animal feces, soil, and sewage water, and even in industrial waste or putrefaction. Biofilm formation is an important virulence trait of Citrobacter sp. pathogens but the process and characteristics of this formation are unclear. Therefore, we employed in vitro assays to study the nutritional and environmental parameters that might influence biofilm formation of C. werkmanii BF-6 using 96-well microtiter plates. In addition, we detected the relative transcript levels of biofilm formation genes by RT-PCR. Our results indicated that the capacity of C. werkmanii BF-6 to form biofilms was affected by culture temperature, media, time, pH, and the osmotic agents glucose, sucrose, NaCl, and KCl. Confocal laser scanning microscopy results illustrated that the structure of biofilms and extracellular polysaccharide was influenced by 100 mM NaCl or 100 mM KCl. In addition, nine biofilm formation genes (bsmA, bssR, bssS, csgD, csgE, csgF, mrkA, mrkB, and mrkE) were found to contribute to planktonic and biofilm growth. Our data suggest that biofilm formation by C. werkmanii BF-6 is affected by nutritional and environmental factors, which could pave the way to the prevention and elimination of biofilm formation using proper strategies.
우한시 실버세대를 위한 화훼 재배 커뮤니티디자인 서비스 제안 - 중국 우한시를 중심으로 -
주연강 ( Zhou Yan-gang ),홍창기 ( Hong Chang-kee ) 커뮤니케이션디자인학회(구 시각디자인학회) 2018 커뮤니케이션 디자인학연구 Vol.63 No.-
우한시의 고령화 현상은 날로 심각해져 생리적 보살핌 위주의 양로방식은 더 이상 교류의 부족으로 오는 감정적인 수요를 만족시킬 수 없게 되었다. 본 연구는 우한시에 거주하는 노인의 일상생활과 취미, 우한시 정부의 정책, 보도기사 등의 자료를 정리 및 분석하여 화훼재배단지 설계서비스의 실행 가능한 방안을 도출해냈다. 또한 화훼재배단지 설계 서비스와 관련된 이익관계자와 시스템과정 등의 측면에서도 더 구체적인 설계를 하고자 하며, 이는 어르신들의 사회적 교류빈도를 높이는데 그 목적이 있다. 궁극적으로 우한시에 거주하는 노인이 감정적으로 필요로 하는 심리적 만족문제를 해결하고자 한다. The aging phenomenon of Wuhan city became more and more serious, and the amphibious way of focusing on physiological care became no longer able to satisfy the emotional demand due to lack of exchange of Wu elders. This study sheds light on the daily life and hobby of Wuhan city elders, policy of Wuhan city government, news reports, It also aims to design more concrete aspects in terms of profit persons and system process related to the flower farming complex design service, which aims to increase the frequency of social interaction among seniors. Ultimately, he tries to solve the emotional needs of the elderly.
Min Zhou,Jie Lou,Yin-Ke Li,Yue-De Wang,Kun Zhou,Bing-Kun Ji,Wei Dong,Xue-Mei Gao,Gang Du,Qiu-Fen Hu 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.1
Versicolols A and B (1 and 2), two rareprenylated isocoumarin derivatives, along with five knownisocoumarins (3–7) were isolated from the fermentationproducts of an endophytic fungus Aspergillus versicolor. Their structures were elucidated on the basis of extensivespectroscopic analysis, including 1D- and 2D-NMR techniques. Compounds 1 and 2 were evaluated for their cytotoxicityagainst five human tumor cell lines. The resultsshowed that compounds 1 exhibited weak cytotoxicityagainst A549 and MCF7 cells with IC50 values of 9.4 and8.8 lm, and compound 2 exhibited weak cytotoxicityagainst SHSY5Y and MCF7 cells with IC50 values of 8.2and 6.8 lm, respectively.