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Calcium-Alginate-Chitosan의 스트론튬 이온 흡착 거동
Lan Dong,Bing Deng,Lan Lan Ding,Qiong Cheng,Yong Yang,Yang Du 한국고분자학회 2014 폴리머 Vol.38 No.5
Sodium alginate and chitosan are added to a CaCl2 solution to prepare calcium-alginate-chitosan and calciumalginategels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption processof the particles obtained for low concentrations of Sr2+ satisfies a second-order kinetic equation and the Freundlich adsorptionmodel. The thermodynamic behaviors of the particles indicate that adsorption occurs via a spontaneous physical process. XPS pattern analysis is used to demonstrate the adsorption of Sr2+ by calcium alginate and chitosan. By buildingan interaction model of the molecules of chitosan and alginate with Ca2+ and Sr2+ to calculate energy parameters, Fukuiindex, Mulliken charge, and Mulliken population, adsorption of Sr2+ on the molecular chains of chitosan as well as theboundary of calcium-alginate-chitosan is observed to show weak stability; by contrast, adsorption between molecularchains is high.
Ding, Xiying,Lan, Tianxiang,Dong, Henan The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
A problem with virtual synchronous generator (VSG) systems is that they are difficult to operate stably with photovoltaic (PV) power as the DC side. With this problem in mind, a PV-VSG control strategy considering the dynamic characteristics of the DC side is proposed after an in-depth analysis of the dynamic characteristics of photovoltaic power with a parallel energy-storage capacitor. The proposed PV-VSG automatically introduces DC side voltage control for the VSG when the PV enters into an unstable working interval, which avoids the phenomenon where an inverter fails to work due to a DC voltage sag. The stability of the original VSG and the proposed PV-VSG were compared by a root locus analysis. It is found that the stability of the PV-VSG is more sensitive to the inertia coefficient J than the VSG, and that a serious power oscillation may occur. According to this, a new rotor model is designed to make the inertial coefficient automatically change to adapt to the operating state. Experimental results show that the PV-VSG control strategy can achieve stable operation and maximum power output when the PV output power is insufficient.
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.
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.
Ding Chenfeng,Yan Xiaodong,Lan Jin-le,유승곤,Yu Yunhua,Yang Xiaoping 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Sustainable biomass-derived porous carbons demonstrate excellent capacitive properties owing to their heteroatom-rich nature and distinct textural feature. Herein, a series of nitrogen-/phosphorus-/oxygen-containing microporous carbons (CWW-N/P/O-MPCs) have been successfully fabricated by etching in H2O2 solution, pre-treatment of camphor wood wastes with KOH solution and subsequent carbonization. As an electrode material for supercapacitors, the typical microporous carbon (CWW-N/P/O-MPCs-0.5) exhibits a remarkably high specific capacitance of 245 F g−1 at 0.5 A g−1, corresponding to an impressively large volumetric capacitance of 208 F m−3, and excellent long-term stability over 10,000 cycles. The excellent electrochemical performance can be ascribed to the optimal combination of heteroatom groups and ultrafine micropores.
Research on the Security Threats and Strategy in Smart Grid Application
Ding, Guanjun,Fan, Bangkui,Long, Teng,Lan, Haibin,Wang, Jing,Chen, Zhiyong The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3
The smart grid is evolving rapidly from a relatively isolated environment to an opened one. The adoption of information and communication technologies can make greater connectivity and interoperability between components. However, the increased connectivity also brings the challenge to security. First of all, in allusion to the current study on security threats to smart grid simple and deficient, the paper induces and analyzes it thoroughly, which can also correct some misunderstanding in a certain degree, from the view of system level, services, confidentiality and so on. Secondly, based on the analysis of security threats, the paper constructs the security strategy for smart grid. It consists of four steps, which are discussed detailedly one by one. It can provide the protection effectively. Finally, relevant conclusions are made.
Xiying Ding,Tianxiang Lan,Henan Dong 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
A problem with virtual synchronous generator (VSG) systems is that they are difficult to operate stably with photovoltaic (PV) power as the DC side. With this problem in mind, a PV-VSG control strategy considering the dynamic characteristics of the DC side is proposed after an in-depth analysis of the dynamic characteristics of photovoltaic power with a parallel energy-storage capacitor. The proposed PV-VSG automatically introduces DC side voltage control for the VSG when the PV enters into an unstable working interval, which avoids the phenomenon where an inverter fails to work due to a DC voltage sag. The stability of the original VSG and the proposed PV-VSG were compared by a root locus analysis. It is found that the stability of the PV-VSG is more sensitive to the inertia coefficient J than the VSG, and that a serious power oscillation may occur. According to this, a new rotor model is designed to make the inertial coefficient automatically change to adapt to the operating state. Experimental results show that the PV-VSG control strategy can achieve stable operation and maximum power output when the PV output power is insufficient.
Chenfeng Ding,Xiaodong Yan,Jin‑le Lan,Seungkon Ryu,Yunhua Yu,Xiaoping Yang 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Sustainable biomass-derived porous carbons demonstrate excellent capacitive properties owing to their heteroatom-rich nature and distinct textural feature. Herein, a series of nitrogen-/phosphorus-/oxygen-containing microporous carbons (CWWN/ P/O-MPCs) have been successfully fabricated by etching in H2O2 solution, pre-treatment of camphor wood wastes with KOH solution and subsequent carbonization. As an electrode material for supercapacitors, the typical microporous carbon (CWW-N/P/O-MPCs-0.5) exhibits a remarkably high specific capacitance of 245 F g− 1 at 0.5 A g− 1, corresponding to an impressively large volumetric capacitance of 208 F m− 3, and excellent long-term stability over 10,000 cycles. The excellent electrochemical performance can be ascribed to the optimal combination of heteroatom groups and ultrafine micropores.