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.

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%.

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

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.

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.

Factors Associated with Behaviors Toward End-of-life Care Among Chinese Oncology Nurses: A Cross-Sectional Study

Xiaoyu Wu,Zhihuan Zhou,Yiheng Zhang,Xiaoyan Lin,Meng Zhang,Fulin Pu,Meifen Zhang 한국간호과학회 2021 Asian Nursing Research Vol.15 No.5

Purpose The goal of this study was to describe the current status of oncology nurses' behaviors toward end of life (EOL) care in China and to explore the factors associated with oncology nurses’ behaviors toward EOL care. Methods A cross-sectional design was applied and a convenience sample of 1038 oncology nurses from 22 grade A hospitals were recruited into this study. A general social demographic data questionnaire was administered, and the Chinese version of Nurses’ Behaviors of Caring for Dying Patients Scale was used to assess nurse behavior toward EOL care. The total score ranges from 40 to 200 points. Data were analyzed with SPSS 26.0 software. Results Chinese oncology nurses' average score of holistic EOL care behaviors was 2.97 ± 0.59. Oncology nurses provide physical care most (3.81 ± 0.76), followed by family care (3.02 ± 0.86), and spiritual care (2.37 ± 0.67). Multiple regression analysis showed that a higher frequency of sharing EOL care experience with colleagues, in-service palliative care education, higher level of head nurse support for EOL patient care, more cases of EOL care, higher working position, and nurse's perceived high level of support were positively associated with behavior toward EOL care. These six factors explained 16.2% of the total variance. Conclusions The results may help provide a basis for converting behavior for EOL care among oncology nurses and design interventions to better improve quality of life for EOL patients with cancer in China. Purpose The goal of this study was to describe the current status of oncology nurses' behaviors toward end of life (EOL) care in China and to explore the factors associated with oncology nurses’ behaviors toward EOL care. Methods A cross-sectional design was applied and a convenience sample of 1038 oncology nurses from 22 grade A hospitals were recruited into this study. A general social demographic data questionnaire was administered, and the Chinese version of Nurses’ Behaviors of Caring for Dying Patients Scale was used to assess nurse behavior toward EOL care. The total score ranges from 40 to 200 points. Data were analyzed with SPSS 26.0 software. Results Chinese oncology nurses' average score of holistic EOL care behaviors was 2.97 ± 0.59. Oncology nurses provide physical care most (3.81 ± 0.76), followed by family care (3.02 ± 0.86), and spiritual care (2.37 ± 0.67). Multiple regression analysis showed that a higher frequency of sharing EOL care experience with colleagues, in-service palliative care education, higher level of head nurse support for EOL patient care, more cases of EOL care, higher working position, and nurse's perceived high level of support were positively associated with behavior toward EOL care. These six factors explained 16.2% of the total variance. Conclusions The results may help provide a basis for converting behavior for EOL care among oncology nurses and design interventions to better improve quality of life for EOL patients with cancer in China.

A real-time multiple vehicle tracking method for traffic congestion identification

( Xiaoyu Zhang ),( Shiqiang Hu ),( Huanlong Zhang ),( Xing Hu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6

Traffic congestion is a severe problem in many modern cities around the world. Real-time and accurate traffic congestion identification can provide the advanced traffic management systems with a reliable basis to take measurements. The most used data sources for traffic congestion are loop detector, GPS data, and video surveillance. Video based traffic monitoring systems have gained much attention due to their enormous advantages, such as low cost, flexibility to redesign the system and providing a rich information source for human understanding. In general, most existing video based systems for monitoring road traffic rely on stationary cameras and multiple vehicle tracking method. However, most commonly used multiple vehicle tracking methods are lack of effective track initiation schemes. Based on the motion of the vehicle usually obeys constant velocity model, a novel vehicle recognition method is proposed. The state of recognized vehicle is sent to the GM-PHD filter as birth target. In this way, we relieve the insensitive of GM-PHD filter for new entering vehicle. Combining with the advanced vehicle detection and data association techniques, this multiple vehicle tracking method is used to identify traffic congestion. It can be implemented in real-time with high accuracy and robustness. The advantages of our proposed method are validated on four real traffic data.

Field-flow fractionation: A gentle separation and characterization technique in biomedicine

Zhang, Xiaoyue,Li, Yueqiu,Shen, Shigang,Lee, Seungho,Dou, Haiyang Elsevier 2018 Trends in analytical chemistry Vol.108 No.-

<P><B>Abstract</B></P> <P>Field-flow fractionation (FFF), a gentle tool for separation and characterization of macromolecules and particles, has attracted increasing interest in recent years due to its broad dynamic size range and the utilization of an “open channel” void of packing materials or stationary phase. In this review, the theoretical principle of FFF separation (such as retention ratio and external force) is described. The FFF sub-techniques based on the type of the external force employed are presented. Sample physical properties directly measured by FFF sub-techniques are summarized. This paper will critically review the applications of FFF in the field of biomedicine, especially those reported in the last five years.</P>

Continuous Sliding Mode Tracking Control with Robust Observer for Nonlinear Systems with Control Gain Uncertainty

Xiaoyu Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.5