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A 2 GS/s, 6-bit DAC for UWB Applications In 0.18 ㎛ CMOS Technology
Yi Zhang,Zhonghua Liu,Changchun Zhang,Yufeng Guo,Ying Zhang,Xiaopeng Li,Youtao Zhang,Hao Gao 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.6
To satisfy higher and higher transmission rate and broadband requirement of modern communication, high-speed, low-resolution Digital-to-Analog Converters (DACs) becomes the key element. In this paper, the design of a 2 GS/s, 6 bit DAC without calibration for Ultra-wideband (UWB) applications, is presented. The DAC is based on current steering architecture and is segmented with 4 bit unary and 2 bit binary. To realize larger linear range and fast switching, the source degeneration switch is designed instead of the traditional differential switch. The DAC is designed and taped-out in SMIC 0.18 ㎜ CMOS technology and the area is 975 ㎛´ 775 ㎛. The wafer bonding measurement results shows that the DNL is 0.11 LSB, INL is 0.25 LSB. Under a clock frequency of 2 ㎓, the DAC can achieve a SFDR of 51 ㏈ for input signal of 6㎒, and a SFDR of 32.4 ㏈ for Nyquist input while the power consumption is 79 ㎽.
Yufeng Zhang,Dmitry Atopkin,Linfei Wang,Donghui Wu 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.3
A new species of Drawida Michaelsen 1900, named Drawida ganini Zhang and Wu sp nov., is describedfrom the material collected in the Muling River of Heilongjiang Province, Northeast China, and theadjacent region near Russia. The new species is morphologically similar to Drawida ghilarovi Gates 1969. The molecular data were more useful for comparison of D. ghilarovi samples. D. ganini is geneticallydifferent from D. ghilarovi by a p-distance value of 18.35 1.37% based on the COI gene sequence data. Thus, Ganin and Atopkin’s (2018) data validate taxonomical status of D. ganini as separated species.
Fuzzy Approximation-Based Backstepping Control of Permanent Magnet Synchronous Motor
Zhang Yufeng,Yan Qi,Huang Nan,Wu Zihui,Gong Hao,Du Guanghui 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
A permanent magnet synchronous motor(PMSM) control system based on backstepping control can effectively improve the dynamic performance, and the design process is simple and easy to be implemented in engineering. However, factors such as changes in motor parameters due to environmental changes, wear and aging, and external load disturbances can adversely affect the control system, resulting in degraded control performance. To address this problem, this paper proposes a fuzzy approximation-based backstepping control method for PMSM. The method constructs a mathematical model containing the perturbation term of the PMSM body parameters and the load disturbance term. And the universal approximation property of the fuzzy logic system is used to approximate the disturbance terms in the model, based on which a backstepping controller satisfying the stability requirements is designed. Finally, the simulation and experiment are given, which compare with the traditional backstepping method. The results show that the proposed method can effectively suppress the adverse effects of motor parameter changes and load disturbances on the motor control system.
?豫峰(Zhang YuFeng),金蘭美(Kim Nan-mi) 중국어문학연구회 2008 중국어문학논집 Vol.0 No.48
From the semantic meaning point of view, we found that in syntactic aspect the Chinese Character “3 shi” is a preposition, and in semantic aspect it has causative, directive and behavioral semantic features. Furthermore, this paper ananlyses the deep semantic meaning relationship between the special structures. The conclusion of the structures meaning of the sentence with Chinese Character “3 shi” is that through the causative reason do effect to the causative object, the object gets a special causative result.
Application of Computer-Aided Approaches to the PUMC Classification of Scoliosis
Junhua Zhang,Hongjian Li,Yufeng Zhang 대한의용생체공학회 2017 Biomedical Engineering Letters (BMEL) Vol.7 No.3
Surgical planning for scoliosis relies on theclassification of the spinal curve pattern. To improve thereliability of the Peking Union Medical College (PUMC)classification system for scoliotic spinal curves, a computer-aided system is proposed and its reliability is evaluated. First, the reliability of curve measurements wasimproved by the computer-aided Cobb measurementapproach. Second, judgmental errors were reduced by thecomputer program through the automation of the PUMCclassification procedure. Four observers divided into anexpert group and a resident group participated in theexperiments. The kappa statistic was used to evaluate thevariability. Classifications of 65 scoliotic cases by the fourobservers showed that with the computer’s aid, the averageintraobserver and interobserver kappa values wereimproved from 0.86 to 0.93 and from 0.75 to 0.86,respectively. The results indicate that the proposed computerizedsystem can assist a surgeon in the PUMC classificationof scoliosis and is especially useful forinexperienced surgeons.
張豫峰(Zhang Yufeng),金蘭美(Kim Nan-mi) 중국어문학연구회 2009 중국어문학논집 Vol.0 No.59
This paper puts the emphasis on the correspondence relationgships between the Shi construction and its relevant sentence patterns in English, and thus points out that the relevant sentence patterns of the Shi construction in English can be divided into two types: analytical-causative sentences and lexical-causative sentences. The paper brings the Shi construction into the research category of different culture background and way of thinking; it analyses the regulations of the Shi construction and its relevant English Patterns in cognitive field and finally explores their grammatical characteristics.
A 32.2 GHz Full Adder Designed with TLE Method in a InP DHBT Technology
Yi Zhang,Xiaopeng Li,Youtao Zhang,Yufeng Guo,Ying Zhang,Hao Gao 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.6
Ultra-high-speed full adder is the bottleneck in a tens of GHz Direct digital synthesizer (DDS). In this paper, a 32.2 GHz, 1bit full adder in a 0.7 μm InP double hetero-junction bipolar transistor (DHBT) technology is presented. In such a high-speed circuit, signal integrity is a crucial issue. Therefore, a transmission line equivalent (TLE) method is proposed. With the TLE method, the design of the full adder could be simplified with good accuracy. The synchronous latch is combined with adding operation to improve the calculation speed. A single-level parallel-gated circuit is designed using majority decision algorithm to reduce power consumption. Measurement results show that the maximum clock frequency of the full adder is 32.2-GHz, and the overall power consumption is 350 mW. The full adder is successfully adopted in a 17 GHz, 8 bit DDS which can synthesize sin-wave outputs from 66.41 MHz to 8.5 GHz in 66.41 MHz steps with an average Spurious-Free Dynamic Range (SFDR) of -18.1 dBc.
Guangyu Zhang,Fangfang He,Chunli Fu,Youzhong Zhang,Qiuan Yang,Jianbo Wang,Yufeng Cheng 대한부인종양학회 2014 Journal of Gynecologic Oncology Vol.25 No.1
Objective: To assess the toxicity of delivering extended field intensity-modulated radiotherapy (EF-IMRT) and concurrent cisplatin chemotherapy for locally advanced cervical carcinoma. Methods: Forty-five patients who underwent EF-IMRT and concurrent cisplatin chemotherapy for the treatment of stage IB2 to IIIB cervical cancer were retrospectively reviewed. The clinical target volume included all areas of gross and potentially microscopic disease and regional lymph node regions. All patients underwent high-dose-rate brachytherapy. The acute and late toxicity were scored using the Common Terminology Criteria for Adverse Events and the Radiation Therapy Oncology Group late radiation morbidity scoring criteria, respectively. Results: The median follow-up was 28 months (range, 5 to 62 months). Forty-two patients had a complete response, and three had a persistent disease. Of those 42 patients, 15 patients (35.7%) had recurrence. The regions of recurrence were in-field in 2 patients and out-field in 13 patients. Acute grade ≥3 gastrointestinal, genitourinary and hematologic toxicity occurred in 3, 1, and 9 patients, respectively. Three patients (6.7%) suffered from late grade 3 toxicities. Seven patients experienced ovarian transposition, 5 of those patients (71%) maintained ovarian function. Thirty-eight patients (84.4%) were alive at the last follow-up. Conclusion: Concurrent cisplatin chemotherapy with EF-IMRT was safe. The acute and late toxicities are acceptable. EF-IMRT provides an opportunity to preserve endocrine function for patients with ovarian transposition.
Simulation Analysis of Indoor Air Flow in a Badminton Gymnasium
Yanli Ren,Deying Li,Yufeng Zhang 국제온돌학회 2007 International Journal of Ondol Vol.2 No.1
To design an efficient and acceptable indoor air environment in a badminton gymnasium, it is important to study the velocity and temperature field in the conditioned room. For diverse airflow patterns, the k- c models with wall function near solid boundaries are adopted to simulate airflow distribution in the gymnasium. The simulated result is analyzed in this paper, and it provides the important reference for the design of air condition system and optimization of the project. CFD is effective design tool for air flow in large space, for it can give the velocity and temperature values at any point quantitatively.