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.

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>

Free Surface Vortex in a Rotating Barrel with Rods of Different Heights

Zhang Xiaoyue,Zhang Min,ChenWanyu,Yang Fan,Guo Xueyan 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.4

A bathtub vortex above the outlet of a rotating barrel is simulated. By analyzing the Ekman layer theory, it can be found that the main flow circulation is inversely proportional to the thickness of Ekman layer. The thicker the Ekman boundary layer, the weaker the rotational strength and the shorter of the length of gas core is. According to this law, models of barriers with rods of different heights are established. The reduction of air-core length in this air entrainment vortex and weakening the strength of rotation field were achieved.

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.

Creativity in Translation : A congnitive approach to translation training

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

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.

컨벤션조직의 공익마케팅활동이 개최지 효과 및 브랜드가치에 미치는 영향 연구

장소월(Zhang, Xiaoyue),윤영혜(Yoon, Yeong Hye),이혜련(Lee, Hey Ryon),윤유식(Yoon, Yoo Shik) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.19 No.-

최근 공익마케팅활동에 대한 관심과 중요성에 대한 인식이 확산됨에 따라 국내 일부 컨벤션센터와 지역컨벤션뷰로에서 사회공헌활동을 추진하고 있으나, 공익마케팅활동에 관한 연구들은 대부분 소비자의 시각에 치중되어 컨벤션센터나 지역 컨벤션뷰로 등 컨벤션 조직원의 관점에서 공익마케팅활동 중요성인식이 어떤지 반영되어 있지 않은 실정이다. 따라서 본 연구에서는 컨벤션과 관련된 공공조직의 종사자들을 대상으로 컨벤션조직의 공익마케팅활동의 중요성 인식을 파악하며, 컨벤션조직의 공익마케팅활동을 실시할 때 컨벤션개최지의 긍정적 또는 부정적 효과에 영향을 미치는지 살펴보고, 개최지 긍정적 효과와 부정적 효과가 개최지 브랜드가치에 어떠한 영향을 미치는지에 대한 분석하고자 한다. This study aims to find the significance of the convention-related public organizations workers" cognition about the importance of public marketing activities. As well as to analysize the outcome of convention organization of public marketing activities holding positive, negative effects and the host brands value relationship. In order to strategically maintain the importance of conventions" differentiation marketing and the brands value of exhibition organization, this research is necessary to explore the importance of public marketing activities held by the public value and brand image link here. In this research, On the convention field public marketing activities" arguments were marketing strategy. In order to construct the convention destination"s competitiveness and the differentiation of public marketing strategy, it is necessary to investigate the relation of convention organizations" public marketing activities" importance recognization and destination effections, destination brand value. As the results we can propose the implication of public marketing activities can enhance the competitive.

Association between hearing loss and physical performance in patients on maintenance hemodialysis

Fan Weifeng,Zhong Xiaojing,Wu Qing,Zhang Lihong,Yang Zhenhao,Gu Yong,Guo Qi,Chen Xiaoyu,Yu Chen,Zhang Kun,Ding Wei,Qi Hualin,Zhao Junli,Zhang Liming,Zhang Suhua,Niu Jianying 대한신장학회 2024 Kidney Research and Clinical Practice Vol.43 No.3

Background: The correlation between hearing loss (HL) and physical performance in patients receiving maintenance hemodialysis (MHD) remains poorly investigated. This study explored the association between HL and physical performance in patients on MHD. Methods: This multicenter cross-sectional study was conducted between July 2020 and April 2021 in seven hemodialysis centers in Shanghai and Suzhou, China. The hearing assessment was performed using pure-tone average (PTA). Physical performance was assessed using the Timed Up and Go Test (TUGT), handgrip strength, and gait speed. Results: Finally, 838 adult patients (male, 516 [61.6%]; 61.2 ± 2.6 years) were enrolled. Among them, 423 (50.5%) had mild to profound HL (male, 48.6% and female, 53.4%). Patients with HL had poorer physical performance than patients without HL (p < 0.001). TUGT was positively correlated with PTA (r = 0.265, p < 0.001), while handgrip strength and gait speed were negatively correlated with PTA (r = –0.356, p < 0.001 and r = –0.342, p < 0.001, respectively). Physical performance in patients aged <60 years showed significant dose-response relationships with HL. After adjusting for confounders, the odds ratios (95% confidence intervals) for HL across the TUGT quartiles (lowest to highest) were 1.00 (reference), 1.15 (0.73–1.81), 1.69 (1.07–2.70), and 2.87 (1.69–4.88) (p for trend = 0.005). Conclusion: Lower prevalence of HL was associated with a faster TUGT and a stronger handgrip strength in patients on MHD.

Histological Validation of Cardiovascular Magnetic Resonance T1 Mapping for Assessing the Evolution of Myocardial Injury in Myocardial Infarction: An Experimental Study

Zhang Lu,Yang Zhi-gang,Xu Huayan,Yang Meng-xi,Xu Rong,Chen Lin,Sun Ran,Miao Tianyu,Zhao Jichun,Zhou Xiaoyue,Fu Chuan,Guo Yingkun 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.12

Objective: To determine whether T1 mapping could monitor the dynamic changes of injury in myocardial infarction (MI) and be histologically validated. Materials and Methods: In 22 pigs, MI was induced by ligating the left anterior descending artery and they underwent serial cardiovascular magnetic resonance examinations with modified Look-Locker inversion T1 mapping and extracellular volume (ECV) computation in acute (within 24 hours, n = 22), subacute (7 days, n = 13), and chronic (3 months, n = 7) phases of MI. Masson’s trichrome staining was performed for histological ECV calculation. Myocardial native T1 and ECV were obtained by region of interest measurement in infarcted, peri-infarct, and remote myocardium. Results: Native T1 and ECV in peri-infarct myocardium differed from remote myocardium in acute (1181 ± 62 ms vs. 1113 ± 64 ms, p = 0.002; 24 ± 4% vs. 19 ± 4%, p = 0.031) and subacute phases (1264 ± 41 ms vs. 1171 ± 56 ms, p < 0.001; 27 ± 4% vs. 22 ± 2%, p = 0.009) but not in chronic phase (1157 ± 57 ms vs. 1120 ± 54 ms, p = 0.934; 23 ± 2% vs. 20 ± 1%, p = 0.109). From acute to chronic MI, infarcted native T1 peaked in subacute phase (1275 ± 63 ms vs. 1637 ± 123 ms vs. 1471 ± 98 ms, p < 0.001), while ECV progressively increased with time (35 ± 7% vs. 46 ± 6% vs. 52 ± 4%, p < 0.001). Native T1 correlated well with histological findings (R2 = 0.65 to 0.89, all p < 0.001) so did ECV (R2 = 0.73 to 0.94, all p < 0.001). Conclusion: T1 mapping allows the quantitative assessment of injury in MI and the noninvasive monitoring of tissue injury evolution, which correlates well with histological findings.