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A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor  [PDF]
Shuhan Yu, Yongjun Chen
Open Access Library Journal (OALib Journal) , 2017, DOI: 10.4236/oalib.1103844
Abstract:
The positionless brushless DC motor has the advantages of simple structure, good speed performance and high efficiency. It has become the best choice for horizontal well tractor. This paper introduces a set of brushless DC motor control system, gives the hardware structure of the system and brushless DC motor without Hall sensor control flow chart and the host computer communication interface protocol which solves the problem of phase lag in the case of high speed motor. Aiming at the problem that the parameters of the motor can not be monitored, the host computer monitoring program based on c# can be designed to monitor the parameters of the motor in real time. The experimental results show that the control system can make the motor run smoothly at different speeds, and can monitor the parameters of the motor in real time, suitable for the horizontal well logging and so on the motor control system requires relatively high industrial environment.
Dynamic Parallel and Distributed Graph Cuts
Miao Yu,Shuhan Shen,Zhanyi Hu
Computer Science , 2015,
Abstract: Graph-cuts are widely used in computer vision. In order to speed up the optimization process and improve the scalability for large graphs, Strandmark and Kahl introduced a splitting method to split a graph into multiple subgraphs for parallel computation in both shared and distributed memory models. However, this parallel algorithm (parallel BK-algorithm) does not have a polynomial bound on the number of iterations and is found non-convergent in some cases due to the possible multiple optimal solutions of its sub-problems. To remedy this non-convergence problem, in this work we first introduce a merging method capable of merging any number of those adjacent sub-graphs which could hardly reach an agreement on their overlapped region in the parallel BKalgorithm. Based on the pseudo-boolean representations of graphcuts,our merging method is shown able to effectively reuse all the computed flows in these sub-graphs. Through both the splitting and merging, we further propose a dynamic parallel and distributed graph-cuts algorithm with guaranteed convergence to the globally optimal solutions within a predefined number of iterations. In essence, this work provides a general framework to allow more sophisticated splitting and merging strategies to be employed to further boost performance. Our dynamic parallel algorithm is validated with extensive experimental results.
MI + MI + CI: Could MI Theory, Multidisciplinary Instruction, and A Community of inquiry, Sum Up to Math Engagement?
Janice-Lynn Shuhan
Analytic Teaching and Philosophical Praxis , 2006,
Abstract: This theoretical piece entertains the notion of increasing math class engagement through a combination of nontraditional frameworks. Research shows low student motivation and achievement in mathematics and the inability to transfer math concepts into real-life situations. Research also shows that that these deficits result from using traditional teaching methods. In this paper I propose a pedagogical blend of three existing and progressively popular frameworks: The process of teaching to Howard Gardner’s multiple intelligences, as a means of maximizing student learning in mathematics, is a way for students to make meaningful connections and relationships. The process of relating and linking two or more disciplines to mathematics is a way to help students make meaningful connections to real-life situations. Thirdly, the process of enabling a cooperative learning environment, whereby group discourse is supported in a community of inquiry setting, is a way to help students build sociocultural and interpersonal relationships, as well as increase their engagement in the learning process. The letter in the word team stands fortogether everyone achieves more—John LounsburyThe purpose of this thought piece is to offer a theoretical argument that supports the relevance ofincorporating an interdisciplinary approach to teaching. By virtue of its integrated and comparativeformat, interdisciplinarity presents the potential foundation for developing our eight intelligences, andthe MI Theory provides an effective instructional framework for structuring interdisciplinary lessons.Another type of contemporary methodology that supports this marriage of the intelligences andinterdisciplinary education in its effort to develop critical thought is cooperative learning.The variable expression in the title of this paper represents a blend of these conceptual frameworksand their potential for facilitating math engagement in adolescents. My discussion focuses on the followingconceptual frameworks: Gardner’s Multiple Intelligences Theory (1983, 1991, 1993b, 1993c, 1997) as itrelates to the multidisciplinary model of teaching, and the Community of Inquiry model (Splitter & Sharp, 1995) as it relates to cooperative learning and Vygotsky’s Zone of Proximal Development(ZPD) in small group settings (1988). As a seasoned secondary mathematics teacher in an urban high school, I have become increasingly interested in teaching to the individual intelligences (or individual strengths) of my math students via interdisciplinary lesson formats and special student-designed projects. From my pe
The influence of Annexin32, a new Ca2+-dependent phospholipid-binding protein, on coagulation time and thrombosis
Yi Zhang,Ruiwen Chen,Shuhan Sun
Science China Life Sciences , 2002, DOI: 10.1360/02yc9021
Abstract: The pharmacodynamics of Annexin32, a new Ca2+-dependent phospholipid-binding protein, was studied by measuring coagulation time in rabbits and venous thrombosis in rabbits and rats. Rabbits and rats were given Annexin32 by intravenous administration. Then Kaolin partial thromboplastin time (KPTT), thrombosis in vitro and in vivo were assayed. The results showed that KPTT of rabbits was prolonged (p < 0.01), and the length and weight of thrombus in vitro were reduced (p < 0.01) after administration of Annexin32 at 1 mg/kg. It also inhibited thrombosis in vivo and reduced the weight of venous thrombus significantly in rats (p < 0.01). All these results suggested that Annexin32 possesses the characteristic of antithrombotic effect and fewer side effects on coagulation time.
Homology modeling threedimensional structure of AnxB1 and reducing its immunogenicity by sequence-deleted mutagenesis
Yan Hongli,Song Yunlong,Liu Fan,He Yan,Sun Shuhan
Science China Life Sciences , 2004, DOI: 10.1360/03yc0085
Abstract: AnxB1, a novel annexin previously isolated from Cysticercus cellulose, shows high thrombi affinity and anticoagulant activity in vivo. In order to investigate the relationship between structure and biological function, a predicted three-dimensional (3D) model of AnxB1 was generated by homology modeling. This model contains four homologous internal-domains and the C/ga trace of domain I, II and IV shows high similarity. Based on the structure characterization, four sequence-deleted mutants were constructed and expressed as GST fusion proteins in E. coli. Two of the mutants, GST-M3 and GST-M4 reserved high anticoagulant activity (p<0.01 vs. GST). Furthermore, compared with the wild type GST-AnxB1, the immunogenicity of GST-M3 and GST-M4 was reduced significantly (p<0.01) and the molecular weight was lowered to 27 kD and 34 kD, respectively. These observations laid a solid foundation for further study on developing new thrombolytic agents with higher efficiency and lower side effect.
An Ecological Balanced Fertilization Model Based on Chemical and Microbial Compound Fertilization
Rongbiao Zhang,Ning Yang,Yuqi Zhao,Shuhan Li
Advance Journal of Food Science and Technology , 2012,
Abstract: This study proposed an Ecological Balanced Fertilization Models (EBFM) based on microbial compound fertilizer. We selected nine evaluating factors as Minimum Data Set (MDS). This MDS includes nutrition and microorganisms. According to the composition of chemistry nutrients to soil, microbial fertilizer and the level of effective fertilizer nutrient supply, we use the EBFM of the specific crops to develop the ratio of various elements. Finally, the Weighted Fuzzy Clustering Algorithm (WFCA) is used to evaluate the soil nutrient spatial changes of proposed EBFM after fertilizer operations comprehensively. The experiment shows that by using the proposed EBFM three years the spatial differences of soil nutrient has become narrowed. The overall fertility of soil has been increased.
Identification, Characterization, and Expression Analysis of the TaNF-YB3 Gene from Triticum aestivum
Xiuchun DONG,Zhiyuan CHENG,Shuhan CHENG,Feng XU
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2011,
Abstract: A full-length cDNA encoding a nuclear factor-YB (NF-YB)/HAP3/CCAAT binding factor-A (CBF-A) subunit of a CCAAT-box binding complex, designated as TaNF-YB3 was isolated from Triticum aestivum. Sequence analysis indicated that the full-length cDNA was 809 bp long, including an open reading frame (ORF) of 597 bp, which encoded a deduced polypeptide of 199 amino acids and is located in chromosome 3D. The deduced protein contained conserved structural domains and showed high identity to other plant NF-YBs. TaNF-YB3 was expressed in various organs, especially in the leaves and stamens; it was also regulated by salt, mannitol, abscisic acid, wounding, and cold. Moreover, TaNF-YB3 was down-regulated by short days and vernalization, and sensitive to the transfer of day length. It was mainly induced by light and exhibited a similar diurnal rhythmic expression pattern with the CCT-domain family gene VRN2 (TaZCCT1 and TaZCCT2), but not with CO (WCO1 and TaHd1). Overall, the results suggested that TaNF-YB3, aside from having a role in regulating day length and vernalization responses, might integrate signals from other environmental stresses to perform its functions in winter wheat adaptability and development.
Matrix Metalloproteinases in Cerebral Vasospasm following Aneurysmal Subarachnoid Hemorrhage
Vivek Mehta,Jonathan Russin,Alexandra Spirtos,Shuhan He
Neurology Research International , 2013, DOI: 10.1155/2013/943761
Abstract:
Medical Management of Cerebral Vasospasm following Aneurysmal Subarachnoid Hemorrhage: A Review of Current and Emerging Therapeutic Interventions
Peter Adamczyk,Shuhan He,Arun Paul Amar,William J. Mack
Neurology Research International , 2013, DOI: 10.1155/2013/462491
Abstract: Cerebral vasospasm is a major source of morbidity and mortality in patients with aneurysmal subarachnoid hemorrhage (aSAH). Evidence suggests a multifactorial etiology and this concept remains supported by the assortment of therapeutic modalities under investigation. The authors provide an updated review of the literature for previous and recent clinical trials evaluating medical treatments in patients with cerebral vasospasm secondary to aSAH. Currently, the strongest evidence supports use of prophylactic oral nimodipine and initiation of triple-H therapy for patients in cerebral vasospasm. Other agents presented in this report include magnesium, statins, endothelin receptor antagonists, nitric oxide promoters, free radical scavengers, thromboxane inhibitors, thrombolysis, anti-inflammatory agents and neuroprotectants. Although promising data is beginning to emerge for several treatments, few prospective randomized clinical trials are presently available. Additionally, future investigational efforts will need to resolve discrepant definitions and outcome measures for cerebral vasospasm in order to permit adequate study comparisons. Until then, definitive recommendations cannot be made regarding the safety and efficacy for each of these therapeutic strategies and medical management practices will continue to be implemented in a wide-ranging manner. 1. Introduction Aneurysmal subarachnoid hemorrhage (aSAH) occurs in approximately 30,000 patients in the United States each year [1]. Cerebral vasospasm is estimated to occur in up to 70% of all aSAH patients and remains a major cause of morbidity and mortality [2]. The complex cascade of factors and events that result in arterial narrowing has been subject to extensive research, leading to a vast array of proposed treatment methods. A large number of these experimental therapies have been evaluated at the basic and translational levels with fewer reported prospective randomized clinical trials. Despite these efforts, no single treatment modality has proven efficacious and trial results have been frequently mixed or conflicting. Therefore medical management practices are often wide-ranging with an assortment of strategies implemented in various permutations. In this report, we review the literature and provide a concise, updated summary of recent clinical trials and current medical treatments evaluated in patients with cerebral vasospasm secondary to aSAH. 2. Triple-H Therapy The current mainstay for medical management of vasospasm secondary to aSAH remains triple-H therapy. The protocol is defined by
Homology modeling three-dimensional structure of AnxB1 and reducing its immunogenicity by sequence-deleted mutagenesis
YAN Hongli,SONG Yunlong,LIU Fan,HE Yan,SUN Shuhan,
YAN Hongli
,SONG Yunlong,LIU Fan,HE Yan & SUN Shuhan .

中国科学C辑(英文版) , 2004,
Abstract: AnxB1, a novel annexin previously isolated from Cysticercus cellulose, shows high thrombi affinity and anticoagulant activity in vivo. In order to investigate the relationship between structure and biological function, a predicted three-dimensional (3D) model of AnxB1 was gen-erated by homology modeling. This model contains four homologous internal-domains and the Ca trace of domain I, II and IV shows high similarity. Based on the structure characterization, four sequence-deleted mutants were constructed and expressed as GST fusion proteins in E. coli. Two of the mutants, GST-M3 and GST-M4 reserved high anticoagulant activity (p<0.01 vs. GST). Furthermore, compared with the wild type GST-AnxB1, the immunogenicity of GST-M3 and GST-M4 was reduced significantly (p<0.01) and the molecular weight was lowered to 27 kD and 34 kD, respectively. These observations laid a solid foundation for further study on developing new thrombolytic agents with higher efficiency and lower side effect.
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