Off-grid direction-of-arrival estimation for wideband noncircular sources

Xiaoyu Zhang1,Haihong Tao,Ziye Fang,Jian Xie 한국전자통신연구원 2023 ETRI Journal Vol.45 No.3

Researchers have recently shown an increased interest in estimating the direction-of-arrival (DOA) of wideband noncircular sources, but existing studies have been restricted to subspace-based methods. An off-grid sparse recovery-based algorithm is proposed in this paper to improve the accuracy of existing algorithms in low signal-to-noise ratio situations. The covariance and pseudo covariance matrices can be jointly represented subject to block sparsity constraints by taking advantage of the joint sparsity between signal components and bias. Furthermore, the estimation problem is transformed into a single measurement vector problem utilizing the focused operation, resulting in a significant reduction in computational complexity. The proposed algorithm's error threshold and the Cramer–Rao bound for wideband noncircular DOA estimation are deduced in detail. The proposed algorithm's effectiveness and feasibility are demonstrated by simulation results.

Analysis on the Present Situation of Golf Vocational Training in China

Xiaoyu Zhang(Xiaoyu Zhang),Junhee Hong(Junhee Hong) 동아시아무역학회 2022 Journal of East Asian Trade(JEAT) Vol.4 No.1

Purpose – Golf started on September 30th, 1982, when Zhang Junlin registered and established Shenzhen Golf Club Co., Ltd. in Shenzhen Municipal Market Supervision Administration. In September of the same year, it was approved by Shenzhen Municipal People’s Government. The establishment of the first established golf club in China also marks the official entry of modern golf into the Chinese market. In 1997, Shenzhen University established the first golf major in China, and now there are nearly 600 golf courses in China. China’s golf industry is still developing at a high speed despite policy restrictions. However, there are still some deficiencies in golf vocational training in China. Through the analysis of the shortcomings, the reasonable development direction is put forward. Design/Methodology/Approach – With the development of golf industry, supporting education has also been carried out in China. Since Shenzhen University, many colleges and universities have also carried out related majors. Golf industry is not limited to golf, but also includes lawn planting, garden art, fashion design, sporting goods manufacturing, hotel management, real estate development, golf education and training, etc., which makes the golf industry bring a variety of jobs and personnel needs. It also makes golf clubs pay more attention to talent cultivation. In this paper, the problems existing in the training of golf talents in clubs and universities are listed and analyzed by means of investigation, to find out the appropriate direction. Findings – Children are an important member of golf club staff. How to carry out good caddy training and improve caddy’s professional level and comprehensive quality has become the task focus of golf club managers. At present, the common problems of golf caddies in China are: 1. There is no uniform training standard, which makes the quality of caddies uneven. 2. The income of caddies is unstable. 3. Most of the temporary employment relationships between caddies and clubs. 4. Caddy talent reserve can’t meet the needs of club staff. 5. Caddy occupation requires physical condition, and it is difficult to transform after unemployment. Research Implications – A good teaching foundation is an important way to cultivate talents, and only the mutual communication between clubs and colleges can help improve the ability of golf vocational training in China.

Effects of the Helicobacter pylori Virulence Factor CagA and Ammonium Ion on Mucins in AGS Cells

Xiaoyu Zhang,Ding Shi,Yong-pan Liu,Wu-jie Chen,Dong Wu 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.5

Purpose: To investigate the effects of Helicobacter pylori (H. pylori)-CagA and the urease metabolite NH4 + on mucin expression inAGS cells. Materials and Methods: AGS cells were transfected with CagA and/or treated with different concentrations of NH4CL. Mucingene and protein expression was assessed by qPCR and immunofluorescence assays, respectively. Results: CagA significantly upregulated MUC5AC, MUC2, and MUC5B expression in AGS cells, but did not affect E-cadherin andMUC6 expression. MUC5AC, MUC6, and MUC2 expression in AGS cells increased with increasing NH4 + concentrations untilreaching a peak level at 15 mM. MUC5B mRNA expression in AGS cells (NH4 + concentration of 15 mM) was significantly higherthan that at 0, 5, and 10 mM NH4 + . No changes in E-cadherin expression in AGS cells treated with NH4 + were noted, except at 20mM. The expression of MUC5AC, MUC2, and MUC6 mRNA in CagA-transfected AGS cells at an NH4 + concentration of 15 mM wassignificantly higher than that at 0 mM, and decreased at higher concentrations. The expression of MUC5B mRNA increased withincreases in NH4 + concentration, and was significantly higher compared to that in untreated cells. No significant change in the expressionof E-cadherin mRNA in CagA-transfected AGS cells was observed. Immunofluorescence assays confirmed the observedchanges. Conclusion: H. pylori may affect the expression of MUC5AC, MUC2, MUC5B, and MUC6 in AGS cells via CagA and/or NH4 + , butnot E-cadherin.

On the Development of Golf Industry in Shandong Province

Xiaoyu Zhang,Haoyu Tan,Qingtao Hu 동아시아무역학회 2021 Journal of East Asian Trade(JEAT) Vol.3 No.2

Purpose – Golf, as an elegant, leisure and social sport, also plays an irreplaceable role in sports. Golf originated in Scotland in the 15th century, with a history of more than 500 years ago. Early golf was mostly played by nobles and nobles. Golf was introduced into Asia in the 1820s. The establishment of Shanghai Golf Club in China in 1896 also marked the formal introduction of golf into China. With the continuous improvement of China’s national economy, people have more time, energy, and money to participate in golf. At the same time, with the development of China’s golf peripheral industries, the participation cost of golf has been greatly reduced. The number of people participating in golf in China has steadily increased. With the return of golf to the Olympic Games in 2016, golf has once again entered the public’s field of vision. At the same time, as an item of the National Games, golf is bound to have a broader future. Design/Methodology/Approach – Under the wave of national fitness, golf has also developed well in Shandong Province. Golf can not only strengthen the body, but also promote the appreciation of real estate around the golf course with the development of golf clubs, and form golf resorts and other sports tourism and holiday industries with golf courses as the core. Brought a lot of tax revenue to the local area. In this paper, the golf industry in Shandong Province is taken as the research object, through SWOT analysis, literature review, data analysis and so on. This paper analyzes the conditions for the development of golf industry in Shandong Province, to clarify the advantages and disadvantages of developing golf industry, and then improve it. Findings – Golf and golf industry can bring a lot of tax revenue to Shandong Province, attract other provinces to travel, increase the local economic level, and promote the common development of surrounding industries. Shandong Province has a good geographical environment, geomorphological features, suitable climate and policy support for the development of golf industry. At the same time, indoor golf in Shandong Province can also reduce the cost of people’s participation in golf, and let people know more about golf. Research Implications – Although the golf course in Shandong Province is limited by the resort attribute, which leads to the high price, indoor golf is a supplement, which makes the golf industry and golf culture in Shandong Province develop healthily together.

Creativity in Translation : A congnitive approach to translation training

ZHANG Xiaoyu,ZHANG Meifang 한국외국어대학교 통번역연구소 2019 한국외국어대학교 통번역연구소 학술대회 Vol.2019 No.07

A Compact Branch-line Coupler with an Ultra-Wide Band Harmonic Suppression

Xiaoyu Zhang,Yang Wang,JongChul Lee 한국ITS학회 2018 한국ITS학회 학술대회 Vol.2018 No.11

EFFECT OF THIOPHENE IN BITHIAZOLE-BRIDGED SENSITIZERS ON THE PERFORMANCE OF DYE-SENSITIZED SOLAR CELLS

XIAOYU ZHANG,JIANLI HUA,JINXIANG HE,WENJUN WU,HANS AGREN,XIN LI,FULING GUO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5

In this paper, we have designed and synthesized four bithiazole-bridged sensitizers (BT-T2,TBT-T2, BT-T3 and TBT-T3) with triphenylamine and indoline as the donor segment andapplied them to dye-sensitized solar cells (DSSCs). For triphenylamine-based sensitizers as BT-T2 and TBT-T2, adding one thiophene unit between triphenylamine donor and bithiazolemoiety not only led to bathochromic shift of the maximum absorption and increase of molarextinction coe±cient, but also enhanced the photovoltaic conversion e±ciency from 7.12% ofBT-T2 to 7.51% of TBT-T2. But for indoline-based sensitizers as BT-T3 and TBT-T3,adding one thiophene unit between indoline donor and bithiazole moiety resulted in hypochro-matic shift instead of bathochromic shift. We employed the density functional theory (DFT)calculations to further investigate the in°uence of the thiophene unit on their optical and elec-tronic properties and photovoltaic performance of corresponding DSSC devices. Given theresults, a reasonable explanation is the introduction of thiophene unit suppressed the intramo-lecular charge transfer and charge separation in the conjugation system of indoline-based sen-sitizer, which led to the hypochromatic shift of the maximum absorption wavelength and ¯nallythe low Jsc . Since the Jsc dropped sharply from 15.26 mAcm? 2 to 4.52 mAcm? 2 , the photovoltaicconversion e±ciency decreased dramatically from 7.86% to 1.93%.

Development of Golf Industry in China and Evolution of Policies and Regulations

Xiaoyu Zhang,Shuo Li,Qingtao Hu 동북아경상학회 2021 동북아경상연구 Vol.2 No.2

Purpose – Golf industry, as a high-tax industry, has gradually become an important economic source for local governments, and at the same time, it can promote the development of surrounding industries and the appreciation of real estate. Form a variety of golf club-centered resorts and make outstanding contributions to local tourism. Driven by high profits, China’s modern golf started late, but it developed rapidly. Although the rapidly developing golf industry brought a lot of tax revenue and promoted the surrounding industries, in the process of rapid development, it was inevitable that there were problems such as fighting for farmland and destroying the environment, which not only hindered the development of golf, but also caused people’s dissatisfaction due to illegal land occupation. Establish the future development direction through the research of existing problems. Design/Methodology/Approach – By combing China’s policies and regulations, this paper can intuitively show the Chinese government’s most direct attitude towards the golf industry in various periods, and can also reflect the development situation of golf in China from the side. Compared with the western countries, Japan and South Korea, the development of China’s golf industry is still relatively backward. By comparing the literature of the golf industry in Korea and China, this paper also draws on the problems in the development process of the golf industry in South Korea, draws lessons from it, sums up the problems existing in China’s golf industry at present, and thus better establishes the future development direction. Make China’s golf industry develop in the right direction. Findings – As long as China reasonably controls the development of the golf industry and adopts the policy of parallel dredging and blocking, golf will develop healthily in China and bring a lot of benefits to China to achieve a win-win situation. Research Implications – Golf industry can not only bring revenue to China, but also reduce environmental damage and find a reasonable development direction.

Pseudolaric Acid B Inhibits Proliferation, Invasion and Epithelial-to-Mesenchymal Transition in Human Pancreatic Cancer Cell

Xiaoyu Li,Xianzhi Zhao,Wen Song,Zibin Tian,Lin Yang,Qinghui Niu,Qi Zhang,Man Xie,Bin Zhou,Yonghong Xu,Jun Wu,Cuiping Zhang 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.1

Purpose: This study was aimed to investigate the effect of pseudolaric acid B (PAB) on proliferation, invasion and epithelial-to-mesenchymal transition (EMT) in pancreatic cancer cells and to explore the possible mechanism. Materials and Methods: The pancreatic cancer cell line SW1990 was cultured and treated with PAB dose- and time-dependent manners. Cell proliferation and invasion ability were measured by MTT assay and Matrigel/Transwell test, respectively. Semi-quantitative real-time polymerase chain reaction and Western blotting were conducted to detect the expression of EMT markers and the key molecules. Finally, nude mice subcutaneous transplantation tumor model was used to confirm the therapy efficacy of PAB. Results: PAB could inhibit SW1990 cell proliferation and invasion in time- and dose-dependent manners. Vimentin, fibronectin, N-cadherin, Snail, Slug, YAP, TEAD1, and Survivin were down-regulated (p<0.01), while E-cadherin, caspase-9, MST1, and pYAP were up-regulated (p<0.05). Combined PAB and gemcitabine treatment markedly restricted the tumor growth compared with gencitabin or PAB alone groups. Conclusion: PAB could inhibit the proliferation and invasion ability of pancreatic cancer cells through activating Hippo-YAP pathway and inhibiting the process of EMT.

Green Synthesis of Gold Nanoparticles Using Longan Polysaccharide and their Reduction of 4-nitrophenol and Biological Applications

Xiaoyu Zhang,Liyuan Fan,Yanshuai Cui,Tianming Cui,Shengfu Chen,Guanglong Ma,Wenlong Hou,Longgang Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02

The green synthesis of gold nanoparticles (Au NPs) for catalytic and biological applications has been drawing great attention. To compare with plant extracts, the polysaccharides may be good reducing and stabilizing agents. In this work, we describe the preparation of longan polysaccharide stabilized gold nanoparticles (Aun-LP NPs) by reduction of gold ions using a green synthetic method. The formation of gold nanoparticles (Au NPs) was confirmed by UV-Vis spectra. TEM showed that Au NPs had a small size (7.8–15.6 nm) and were highly dispersed without any aggregation. XPS confirmed that the surface elemental composition of Aun-LP NPs was C, O, and Au. DLS demonstrated that Aun-LP NPs had good stability and negative zeta potential. In addition, Aun-LP NPs had high catalytic activity for the reduction of 4-nitrophenol. More importantly, Aun-LP NPs had ignorable cytotoxicity towards HeLa cells and showed good antioxidant activity. Taken together, the results indicated that longan polysaccharide can be used as reducing agents and stabilizers for the preparation of metallic nanoparticles, and the product had wide applications.