清華簡《厚父》疏證

Yiqiang Wu 한국중국학회 2017 中國學報 Vol.81 No.-

Through the study of the literature itself of “Hou Fu”(厚父), from the aspects of words, sentence and meaning, the original text has been carefully explained and dredged. The interpretation of some key words, such as gong(鞏), you(佑), chuan(傳), yuan(淵), zuo(佐) etc, I have submitted my opinions in the explanation of some words and the understanding of several characters, Such as the interpretation of kong jia(孔甲), gao tao(皋陶), as well as the interpretation of the identity of “Hou Fu”, It is pointed out that the “Hou Fu” may be the “Qing fu”(慶輔)of Yu zi(鬻子), the minister of Shang tang(商湯),It enhances the understanding of the literature itself and helps to judge the nature of the text. 清華簡《厚父》,是一篇重要的文獻,全篇爲王與厚父的對話,王通過回顧夏代歷史,總結如何才能永保邦國。厚父則從德、天命、民心、戒酒等幾方面闡明保國之道。整理者以及諸多學者已從字詞、文句等方面做了很好的解釋。筆者在研讀《厚父》過程中,亦有些許看法,今就字詞、斷句、文意及文本屬性等基本方面進行疏通。

Flame retardancy and thermal degradation behavior of red gum wood treated with hydrate magnesium chloride

Yiqiang Wu,Chunhua Yao,Yunchu Hu,Shoulu Yang,Yan Qing,Qinglin Wu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Flame retardancy and thermal degradation of wood treated with magnesium chloride (MgCl2 6H2O) were investigated. Results showed that MgCl2 6H2O decreased flame intensity and heat release rate, and reduced smoke concentration and gas yield. From ambient temperature to 250 ℃, MgCl2 6H2O reduced wood combustibility by gas dilution mechanism. The chemical started to decompose at 350 8C and produced MgOHCl, in which -Cl and -Mg free radicals were generated and intervened the chain reactions of wood combustion. Hydrogen chloride gas generated promoted wood charring. MgCl2 6H2O gradually converted to MgOHCl and MgO compounds at higher temperatures, and MgO suppressed wood combustion by the wall effect mechanism.

淸華簡≪厚父≫疏證

오의강 ( Wu Yiqiang ) 한국중국학회 2017 중국학보 Vol.81 No.-

通過對≪厚父≫文獻本身的硏讀,從字詞、斷句及文意等方面,對原文進行了細緻的解釋與疏通。對某些關鍵字的解釋,如鞏、佑、傳、淵、佐等;在一些詞語的解釋,及幾位人物的認識方面, 皆提出己見, 如對孔甲、皐陶,以及厚父身分的解釋,指出厚父可能卽≪?子≫所載湯之大臣“慶輔”,增進了對文獻本身的理解,幷有助於判斷文本的性質。 Through the study of the literature itself of “Hou Fu”(厚父), from the aspects of words, sentence and meaning, the original text has been carefully explained and dredged. The interpretation of some key words, such as gong(鞏), you(佑), chuan(傳), yuan(淵), zuo(佐) etc, I have submitted my opinions in the explanation of some words and the understanding of several characters, Such as the interpretation of kong jia(孔甲), gao tao(皐陶), as well as the interpretation of the identity of “Hou Fu”, It is pointed out that the “Hou Fu” may be the “Qing fu”(慶輔)of Yu zi(?子), the minister of Shang tang(商湯),It enhances the understanding of the literature itself and helps to judge the nature of the text.

Bounding Worst-Case DRAM Performance on Multicore Processors

Yiqiang Ding,Lan Wu,Wei Zhang 한국정보과학회 2013 Journal of Computing Science and Engineering Vol.7 No.1

Bounding the worst-case DRAM performance for a real-time application is a challenging problem that is critical for computing worst-case execution time (WCET), especially for multicore processors, where the DRAM memory is usually shared by all of the cores. Typically, DRAM commands from consecutive DRAM accesses can be pipelined on DRAM devices according to the spatial locality of the data fetched by them. By considering the effect of DRAM command pipelining, we propose a basic approach to bounding the worst-case DRAM performance. An enhanced approach is proposed to reduce the overestimation from the invalid DRAM access sequences by checking the timing order of the co-running applications on a dual-core processor. Compared with the conservative approach, which assumes that no DRAM command pipelining exists, our experimental results show that the basic approach can bound the WCET more tightly, by 15.73% on average. The experimental results also indicate that the enhanced approach can further improve the tightness of WCET by 4.23% on average as compared to the basic approach.

Comparing Separate and Statically-Partitioned Caches for Time-Predictable Multicore Processors

Wu, Lan,Ding, Yiqiang,Zhang, Wei Korean Institute of Information Scientists and Eng 2014 Journal of Computing Science and Engineering Vol.8 No.1

In this paper, we quantitatively compare two different time-predictable multicore cache architectures, separate and statically-partitioned caches, through extensive simulation. Current research trends primarily focus on partitioned-cache architectures in order to achieve time predictability for hard real-time multicore based systems, and our experiments reveal that separate caches actually lead to much better performance and energy efficiency when compared to statically-partitioned caches, and both of them are adequate for timing analysis for real-time multicore applications.

Bounding Worst-Case DRAM Performance on Multicore Processors

Ding, Yiqiang,Wu, Lan,Zhang, Wei Korean Institute of Information Scientists and Eng 2013 Journal of Computing Science and Engineering Vol.7 No.1

Bounding the worst-case DRAM performance for a real-time application is a challenging problem that is critical for computing worst-case execution time (WCET), especially for multicore processors, where the DRAM memory is usually shared by all of the cores. Typically, DRAM commands from consecutive DRAM accesses can be pipelined on DRAM devices according to the spatial locality of the data fetched by them. By considering the effect of DRAM command pipelining, we propose a basic approach to bounding the worst-case DRAM performance. An enhanced approach is proposed to reduce the overestimation from the invalid DRAM access sequences by checking the timing order of the co-running applications on a dual-core processor. Compared with the conservative approach, which assumes that no DRAM command pipelining exists, our experimental results show that the basic approach can bound the WCET more tightly, by 15.73% on average. The experimental results also indicate that the enhanced approach can further improve the tightness of WCET by 4.23% on average as compared to the basic approach.

Comparing Separate and Statically-Partitioned Caches for Time-Predictable Multicore Processors

Lan Wu,Yiqiang Ding,Wei Zhang 한국정보과학회 2014 Journal of Computing Science and Engineering Vol.8 No.1

In this paper, we quantitatively compare two different time-predictable multicore cache architectures, separate and statically-partitioned caches, through extensive simulation. Current research trends primarily focus on partitioned-cache architectures in order to achieve time predictability for hard real-time multicore based systems, and our experiments reveal that separate caches actually lead to much better performance and energy efficiency when compared to staticallypartitioned caches, and both of them are adequate for timing analysis for real-time multicore applications.

Rheology, curing temperature and mechanical performance of oil well cement: Combined effect of cellulose nanofibers and graphene nano-platelets

Sun, Xiuxuan,Wu, Qinglin,Zhang, Jinlong,Qing, Yan,Wu, Yiqiang,Lee, Sunyoung Elsevier 2017 Materials & Design Vol.114 No.-

<P><B>Abstract</B></P> <P>Cellulose nanofibers (CNFs) were prepared through acid hydrolysis and used in combination with graphene nano-platelets (GNPs) as modifiers for oil well cement (OWC). The rheology behavior of CNF/GNP-OWC slurries at three temperatures (i.e., 20, 40, and 60°C) was measured and modeled using four different rheological models. Thermal properties, surface functional groups, morphology, and mechanical performance of the composites were characterized. CNF/GNP-OWC slurry exhibited a typical shear-thinning behavior with reduced shear viscosity at higher shear rates. The use of CNFs and GNPs led to increased yield stresses of fresh CNF/GNP-OWC slurry and temperature significantly influenced the yield stress values. Among these rheology models, the Vom Berg model exhibits the best fitting result of the slurry rheology data (R<SUP>2</SUP> =0.999). The addition of CNFs and GNPs increased degree of hydration (DOH) value of CNF/GNP-OWC composites. Both flexural and compressive strengths of the CNF/GNP-OWC composites were enhanced with added CNFs and GNPs. The reinforcing mechanism was attributed to the increased DOH, reduced pores, and bridging effect of CNFs and GNPs in the composites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cellulose nanofibers (CNFs) and graphene nanoplatelets (GNPs) reinforced oil well cement (OWC) composites were prepared and characterized. </LI> <LI> Vom Berg model provided the best fitting to measured rheology data of OWC slurry. </LI> <LI> CNFs and GNPs enhanced flexural and compressive strengths of OWC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Cellulose Nanocrystals and Polyanionic Cellulose as Additives in Bentonite Water-Based Drilling Fluids: Rheological Modeling and Filtration Mechanisms

Li, Mei-Chun,Wu, Qinglin,Song, Kunlin,De Hoop, Corneils F.,Lee, Sunyoung,Qing, Yan,Wu, Yiqiang American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.1

<P>This research aims to develop low cost, sustainable, environmentally friendly, and high performance water-based drilling fluids (WDFs) using bentonite (BT), polyanionic cellulose (PAC), and cellulose nanocrystals (CNCs). The effect of concentration of BT, PAC, and CNCs on the rheological and filtration properties of PAC/CNC/BT-WDFs was investigated. Eight empirical rheological models were applied to fit quantitatively the fluid properties. Results showed that the presence of PAC, CNCs, and BT improved the rheological and filtration properties of the WDFs. Among the eight empirical rheological models, the Sisko model performed the best in simulating the rheological behavior of the fluids. At the same concentration level of PAC and CNCs, CNCs had more impact on the rheological properties, whereas PAC had more influence on the filtration property. The incorporation of PAC resulted in very low permeable filter cakes, leading to the excellent filtration property. The combined use of PAC and CNCs yielded better rheological and filtration properties.</P>

Mechanical behavior of stud shear connectors embedded in HFRC

Yu-Liang He,Xu-Dong Wu,Yiqiang Xiang,Yu-Hang Wang,Li-Si Liu,Zhi-Hai He 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.24 No.2

Hybrid-fiber reinforced concrete (HFRC) may provide much higher tensile and flexural strengths, tensile ductility, and flexural toughness than normal concrete (NC). HFRC slab has outstanding advantages for use as a composite bridge potential deck slab owing to higher tensile strength, ductility and crack resistance. However, there is little information on shear connector associated with HFRC slabs. To investigate the mechanical behavior of the stud shear connectors embedded in HFRC slab, 14 push-out tests (five batches) in HFRC and NC were conducted. It was found that the stud shear connector embedded in HFRC had a better ductility, higher stiffness and a slightly larger shear bearing capacity than those in NC. The experimentally obtained ultimate resistances of the stud shear connectors were also compared against the equations provided by GB50017 2003, ACI 318-112011, AISC 2011, AASHTO LRFD 2010, PCI 2004, and EN 1994-1-1 (2004), and an empirical equation to predict the ultimate shear connector resistance considering the effect of the HFRC slabs was proposed and validated by the experimental data. Curve fitting was performed to find fitting parameters for all tested specimens and idealized load-slip models were obtained for the specimens with HFRC slabs.