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Shuo Zhang,Yuzheng Xia,Tao Yang,Xiang Li,Daorong Lu,Haibing Hu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
The generalized discrete Fourier transform (GDFT) realizes the rapid extraction of specific order harmonics, and shortens the extraction time to 1/3 of a fundamental cycle (6.7 ms at 50 Hz grid) for 6r ± 1 order harmonics. However, the GDFT becomes less accurate when the system presents background harmonics other than specific-order harmonics in the inputs. Therefore, this paper analyzes the influence introduced by these background harmonics on the GDFT. First, the frequency feature of the GDFT is derived by a geometric method based on the z-domain unit circle. Then, the extraction of the 6r ± 1 order harmonics is taken as an example to show the extraction accuracy of the GDFT. The Accuracy of Harmonic Extraction (AHE) index, is also given to evaluate the accuracy of the extraction. Simulation and experimental results confirmed the correctness of the theoretical analysis by showing that the GDFT has the same accuracy as the RDFT when only 6r ± 1 order harmonics are involved. However, if there are other background harmonics in the inputs, the extraction accuracy is affected greatly. Therefore, when the background harmonics cannot be ignored, it is necessary to analyze the AHE of the GDFT. When AHE > 95%, the GDFT has good accuracy and is applicable to real applications.
Trends in Three-dimensional Biochips
Shuo Ren,윤혜림,김소연 한국바이오칩학회 2008 BioChip Journal Vol.2 No.3
In the past decade we have witnessed a rapid development in nano biotechnology that has yielded highthroughput and large-scale analysis within a miniaturized and parallel assay system. The biochip is a powerful emerging technology for biomedical, diagnostical, therapeutical, toxicological, and environmental applications. There are diverse sensing mediators used for biochips, including DNA, RNA, and protein, and moreover, even living cells are being studied. Recently, a large variety of biochip materials have been developed. Here, we will give an overview of the trends in three-dimensional biochip materials, particularly focusing on gel materials in biochip applications. We will review some unique methods and remaining challenges.
Shuo Zhang,Zeng-Jun Sun 동중앙아시아경상학회 2014 한몽경상연구 Vol.25 No.2
With the development of Internet technology, electronic commerce shows the vigorous vitality; along with the popularity of a mobile phone and network operator’s technology, electronic commerce began to develop online mode. According to the "2013 annual Chinese e-commerce market data monitoring report", until the December of 2013, trading in e-commerce market scale is 10.2 trillion yuan, grows 29.9% compared to the same period. The online retail market scale is 18851 billion yuan, a year-on-year growth of 42.8%. However, this data only accounted for 8.04% of the total retail sales of social consumer goods, while there are 91.96% lines which are waiting for developing. The biggest advantage of the O2O(online to offline) is it can be introduced the consumers to offline trading. The current O2O e-commerce in China is still in the initial stage of development, there are challenges and opportunities .If the network of electronic commerce and the entity shop retailers can seize the opportunity, and be acknowledged of what the consumers want and need, make full use of large data analysis, he will be successful. Firstly, this paper explains the purpose and significance of the topic, underlining the present internet background and the status of e-commerce in the Internet environment, analyzing the current situation O2O faces, besides, we give some analysis of the O2O mode and summarize the advantages of him. Secondly, through the analysis of 19e O2O, we find the problems in the process of its development. Then, through the example of 19e, we find the problem and deficiency in the development of Chinese O2O. Finally, we summarize it and give some expectations of the O2O’s development in the future.
Performance Comparison Between Hama and Hadoop
Shuo Li,Baomin Xu 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.3
Massive scientific computations such as matrix, graph and network algorithms are very attractive when they come to modelling real-world data. Apache Hama is a pure BSP (Bulk Synchronous Parallel) distributed computing framework for massive scientific computations. In this paper, our experiments were conducted on a 4-node Hadoop cluster. We implement Monte Carlo algorithm of Pi in Hama and Hadoop under the same software and hardware environment. The experimental results show that Hama can achieve much higher performance than Hadoop in our testbed.
Shuo Guan Techno-Press 2023 Advances in nano research Vol.15 No.2
Exercise is beneficial to the body in some ways. It is vital for people who have heart problems to perform exercise according to their condition. This paper describes how an Android platform can provide early warnings of fatigue during wushu exercise using Photoplethysmography (PPG) signals. Using the data from a micro-electro-mechanical system (MEMS) gyroscope to detect heart rate, this study contributes an algorithm to determine a user's fatigue during wushu exercise. It sends vibration messages to the user's smartphone device when the heart rate exceeds the limit or is too fast during exercise. The heart rate monitoring system in the app records heart rate data in real-time while exercising. A simple pulse sensor and Android app can be used to monitor heart rate. This plug-in sensor measures heart rate based on photoplethysmography (PPG) signals during exercise. Pulse sensors can be easily inserted into the fingertip of the user. An embedded microcontroller detects the heart rate by connecting a pulse sensor transmitted via Bluetooth to the smartphone. In order to measure the impact of physical activity on heart rate, Wushu System tests are conducted using various factors, such as age, exercise speed, and duration. During testing, the Android app was found to detect heart rate with an accuracy of 95.3% and to warn the user when their heart rate rises to an abnormal level.
Clinical Outcome in Male Patients With Detrusor Overactivity With Impaired Contractility
Shuo Liu,Lewis Chan,Vincent Tse 대한배뇨장애요실금학회 2014 International Neurourology Journal Vol.18 No.3
Purpose: To review the clinical outcomes of patients with voiding dysfunction who have detrusor overactivity with impaired contractility (DOIC) diagnosed with urodynamic studies. Methods: Urodynamic reports from 2005 to 2009 were reviewed, and 54 male patients had findings consistent with DOIC. Patients with acontractile or neuropathic bladders were excluded. Clinical outcomes were obtained from patient records. Results: Of 54 men, 8 presented with voiding symptoms, 17 had storage symptoms, and 29 had mixed symptoms. Twenty-two had a previous transurethral resection of the prostate. The median follow-up was 12 months. Four patients received no intervention. Two patients were taught intermittent self-catheterization. Five patients underwent surgery to reduce outlet resistance and all reported improvement. Forty-three patients were started on pharmacotherapy; symptomatic improvement was reported by 9 of 16 patients commenced on anticholinergics alone, 6 of 16 on alpha-blockers alone, and 4 of 5 treated with a combination of alpha-blockers and anticholinergics. Eleven patients experienced no difference on pharmacotherapy and 2 reported deterioration. One patient developed acute urinary retention (18 months after commencing treatment with alpha-blockers). No patient had urosepsis. Conclusions: Anticholinergics and alpha-blockers appear to be safe in patients with DOIC. The risk of urinary retention and sepsis is low. The majority of patients report symptomatic benefit from either drugs or surgical treatment.
Grey fuzzy PI control for packing pressure during injection molding process
Shuo Wang,Ji Ying,Zichen Chen,Kan Cai 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.4
This study presents a grey fuzzy PI (GFPI) controller for packing pressure control during the injection process. The novel controller was designed for solving the problems of large overshoot, static error, and long delay time on servo motor-driven injection molding machines. Based on reasonable assumptions, a mathematical model of injection system was established. According to the nonlinear, severe interferences, and long delay time characteristics in injection process, this paper integrates predictive grey system, robust fuzzy ratiocination,and PI control. Using these mathematical model and control algorithms, a GFPI controller is implemented into an MCU using C programming techniques. The integral discrete PID controller and solid fuzzy controller were realized for contrast experiments. The experimental results show that GFPI controller had better performance on reducing overshoot and static error, increasing both response rate and repeatable accuracy. Such a developed technology would provide helpful references for designing the controller of energy-saving servo motor-driven injection molding equipment.