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  • Zhabelova, Gulnara, et al. (författare)
  • Cyber-physical components for heterogeneous modeling, validation and implementation of smart grid intelligence
  • 2014
  • Ingår i: 12th IEEE Conference on Industrial Informatics (INDIN 2014) : Porto Alegre, Brazil, 27 - 30 July 2014. - Piscataway, NJ : IEEE Communications Society. ; s. 411-417
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a practical framework to bring the cyber-physical block diagram models, such as Ptolemy, to the practice of industrial automation. Cyber-Physical Component (CPC) architecture is suggested. CPC aims at the improvement of design, verification and validation practices in automation of Smart Grid. IEC 61499 standard is used as a basis for this architecture. This architecture addresses several design software and system engineering challenges: right equilibrium between abstract representation and “executability” and round-trip engineering. An CPC exhibit such properties as portability, interoperability and configurability thanks to the reliance on open standards. The use of time stamp based execution paradigm adds determinism and predictability at the run-time.
  • Zhang, Jiao, et al. (författare)
  • Joint Resource Allocation for Latency-Sensitive Services Over Mobile Edge Computing Networks With Caching
  • 2019
  • Ingår i: IEEE Internet of Things Journal. - IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 2327-4662. ; 6:3, s. 4283-4294
  • Tidskriftsartikel (refereegranskat)abstract
    • Mobile edge computing (MEC) has risen as a promising paradigm to provide high quality of experience via relocating the cloud server in close proximity to smart mobile devices (SMDs). In MEC networks, the MEC server with computation capability and storage resource can jointly execute the latency-sensitive offloading tasks and cache the contents requested by SMDs. In order to minimize the total latency consumption of the computation tasks, we jointly consider computation offloading, content caching, and resource allocation as an integrated model, which is formulated as a mixed integer nonlinear programming (MINLP) problem. We design an asymmetric search tree and improve the branch and bound method to obtain a set of accurate decisions and resource allocation strategies. Furthermore, we introduce the auxiliary variables to reformulate the proposed model and apply the modified generalized benders decomposition method to solve the MINLP problem in polynomial computation complexity time. Simulation results demonstrate the superiority of the proposed schemes.
  • Zhang, Lun, et al. (författare)
  • Reconstruction of defects following surgery for hypopharyngeal carcinoma using artificial biological material
  • 2010
  • Ingår i: Acta Oto-Laryngologica. - 0001-6489 .- 1651-2251. ; 130:11, s. 1293-1299
  • Tidskriftsartikel (refereegranskat)abstract
    • Conclusions: Use of artificial biological material - acellular dermal matrix (Alloderm, ADM) - combined with pectoralis major myocutaneous flaps (PMMFs) or other cervical tissue is a feasible technique with which to reconstruct a large circumferential defect involving the oral cavity and hypopharynx. Objective: This paper presents a review of seven patients with advanced hypopharyngeal carcinoma treated at Tianjin Medical University Cancer Institute & Hospital, China, over a 4-year period. Methods: ADM was used in the form of tissue patches for reconstruction. Five of the seven patients underwent total laryngectomy and total hypopharyngectomy, and reconstruction with a combination of PMMF and ADM tissue patches to restore hypopharyngeal functions. Two other patients underwent tumour resection. The defect in the posterior pharyngeal wall was reconstructed with ADM. Treatment details of the seven patients are discussed. Results: All five PMMFs and seven ADM tissue patches survived. No pharyngeal fistula occurred. Satisfactory healing was observed between the wound margin and ADM 10 days after operation. The trauma area was completely covered by growing epithelium 18-37 days after operation. To some degree, stenosis of the pharyngeal cavity did occur, but patients could have a regular diet following dilatation of the stenosis. Five patients are free of disease after 18-42 months of follow-up.
  • Zhang, Lei, et al. (författare)
  • Theoretical realization of robust broadband transparency in ultrathin seamless nanostructures by dual blackbodies for near infrared light
  • 2013
  • Ingår i: Nanoscale. - 2040-3364. ; 5:8, s. 3373-3379
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose a counter-intuitive mechanism of constructing an ultrathin broadband transparent device with two perfect blackbodies. By introducing hybridization of plasmon modes, resonant modes with different symmetries coexist in this system. A broadband transmission spectrum in the near infrared regime is achieved through controlling their coupling strengths, which is governed by the thickness of high refractive index layer. Meanwhile, the transparency bandwidth is found to be tunable in a large range by varying the geometric dimension. More significantly, from the point view of applications, the proposed method of achieving broadband transparency can perfectly tolerate the misalignment and asymmetry of periodic nanoparticles on the top and bottom, which is empowered by the unique dual of coupling-in and coupling-out processes within the pair of blackbodies. Moreover, roughness has little influence on its transmission performance. According to the coupled mode theory, the distinguished transmittance performance is physically interpreted by the radiative decay rate of the entire system. In addition to the feature of uniquely robust broadband transparency, such a ultrathin seamless nanostructure ( in the presence of a uniform silver layer) also provides polarization-independent and angle-independent operations. Therefore, it may power up a wide spectrum of exciting applications in thin film protection, touch screen techniques, absorber-emitter transformation, etc.
  • Zhang, Q., et al. (författare)
  • Mechanical property and reliability of bimodal nano-silver paste with Ag-coated SiC particles
  • 2019
  • Ingår i: Soldering and Surface Mount Technology. - 0954-0911. ; 31:4, s. 193-202
  • Tidskriftsartikel (refereegranskat)abstract
    • © 2019, Emerald Publishing Limited. Purpose: This study aims to develop a bimodal nano-silver paste with improved mechanical property and reliability. Silicon carbide (SiC) particles coated with Ag were introduced in nano-silver paste to improve bonding strength between SiC and Ag particles and enhance high-temperature stability of bimodal nano-silver paste. The effect of sintering parameters such as sintering temperature, sintering time and the proportion of SiC particles on mechanical property and reliability of sintered bimodal nano-silver structure were investigated. Design/methodology/approach: Sandwich structures consist of dummy chips and copper substrates with nickel and silver coating bonded by nano-silver paste were designed for shear testing. Shear strength testing was conducted to study the influence of SiC particles proportions on the mechanical property of sintered nano-silver joints. The reliability of the bimodal nano-silver paste was evaluated experimentally by means of shear test for samples subjected to thermal aging test at 150°C and humidity and temperature testing at 85°C and 85 per cent RH, respectively. Findings: Shear strength was enhanced obviously with the increase of sintering temperature and sintering time. The maximum shear strength was achieved for nano-silver paste sintered at 260°C for 10 min. There was a negative correlation between the proportion of SiC particles and shear strength. After thermal aging testing and humidity and temperature testing for 240 h, the shear strength decreased a little. High-temperature stability and high-hydrothermal stability were improved by the addition of SiC particles. Originality/value: Submicron-scale SiC particles coated with Ag were used as alternative materials to replace part of nano-silver particles to prepare bimodal nano-silver paste due to its high thermal conductivity and excellent mechanical property.
  • Zhang, Rong, et al. (författare)
  • ISL1 is a major susceptibility gene for classic bladder exstrophy and a regulator of urinary tract development
  • 2017
  • Ingår i: Scientific Reports. - Nature Publishing Group. - 2045-2322. ; 7
  • Tidskriftsartikel (refereegranskat)abstract
    • Previously genome-wide association methods in patients with classic bladder exstrophy (CBE) found association with ISL1, a master control gene expressed in pericloacal mesenchyme. This study sought to further explore the genetics in a larger set of patients following-up on the most promising genomic regions previously reported. Genotypes of 12 markers obtained from 268 CBE patients of Australian, British, German Italian, Spanish and Swedish origin and 1,354 ethnically matched controls and from 92 CBE case-parent trios from North America were analysed. Only marker rs6874700 at the ISL1 locus showed association (p = 2.22 × 10-08). A meta-analysis of rs6874700 of our previous and present study showed a p value of 9.2 × 10-19. Developmental biology models were used to clarify the location of ISL1 activity in the forming urinary tract. Genetic lineage analysis of Isl1-expressing cells by the lineage tracer mouse model showed Isl1-expressing cells in the urinary tract of mouse embryos at E10.5 and distributed in the bladder at E15.5. Expression of isl1 in zebrafish larvae staged 48 hpf was detected in a small region of the developing pronephros. Our study supports ISL1 as a major susceptibility gene for CBE and as a regulator of urinary tract development.
  • Zhang, Xiangwei, et al. (författare)
  • The prognostic value of tumor length to resectable esophageal squamous cell carcinoma a retrospective study
  • 2017
  • Ingår i: PeerJ. - 2167-8359. ; 5
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: The current TNM classification system does not consider tumor length for patients with esophageal carcinoma (EC). This study explored the effect of tumor length, in addition to tumor depth and lymph node involvement, on survival in patients with esophageal squamous cell carcinoma (ESCC).Methods: A total of 498 ESCC patients who underwent surgical resection as the primary treatment were selected in the retrospective study. Pathological details were collected, which included tumor type, TNM stage, differentiation. Other collected information were: the types of esophageal resection, ABO blood group, family history and demographic and lifestyle factors. A time-dependent receiver operating characteristic (ROC) curve and a regression tree for survival were used to identify the cut-off point of tumor length, which was 3 cm. Univariate and multivariate Cox proportional hazard regression models were used to identify the prognostic factors to ESCC.Results & Discussion: The 1-, 3-, 5-year overall survival rates were found to be 82.5%, 55.6%, and 35.1%, respectively. Patients who had larger tumor length (>3 cm) had a higher risk for death than the rest patients. From the univariate Cox proportional hazards regression model, the overall survival rate was significantly influenced by the depth of the tumor and lymph node involvement (either as dummy or continuous variables), Sex, and tumor length. Using these four variables in the multivariate Cox proportional hazard regression model, we found that the overall survival was significantly influenced by all variables except Sex. Therefore, in addition to the depth of the tumor and lymph node involvement (as either dummy or continuous variables), the tumor length is also an independent prognostic factor for ESCC. The overall survival rate was higher in a group with smaller tumor length (≤3 cm) than those patients with larger tumor length (>3 cm), no matter what the tumor stage was.Conclusion: The tumor length was found to be an important prognostic factor for ESCC patients without receiving neoadjuvant therapy. The modification of EC staging system may consider tumor length to better predict ESCC survival and identify higher risk patients for postoperative therapy.
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