Optimal Design for Cooling System of Batteries Using DOE and RSM

Zhen-Zhe Li,Yun-De Shen,Tai-Hong Cheng,Dong-Ji Xuan,Ming Ren,Gui-Ying Shen 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

A hybrid power composed of fuel cell and batteries has become the good strategy for HEV. On the contrary, the produced heat of batteries can affect to the total performance of HEV significantly. In this study, simulation methods with optimization were developed for obtaining the high performance cooling system of batteries. At first, a numerical method for obtaining the temperature distribution of batteries was developed by using CFD. In the following step, several parameters were investigated for selecting design variables with the important effect on the performance of the cooling system of batteries. Finally, an optimization method based on DOE and RSM was obtained through a real optimal design. There was 21.1% reduction on the view of the root mean square temperature between batteries as shown in the optimization result. The developed analysis with optimization can be used to improve the performance of the cooling system of batteries, and these works have made the theoretical basis for simulation and optimization of the cooling system of batteries.

Temperature Dependence of the Cross Sections for Meson-Meson Nonresonant Reactions in Hadronic Matter

Zhen-Yu Shen,Xiao-Ming Xu 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.5

We study the unpolarized cross sections for the endothermic nonresonant reactions, ππ → ρρ forI = 2, KK → K∗K∗for I = 1, KK∗ → K∗K∗for I = 1, πK → ρK∗for I = 3/2, πK∗ → ρK∗for I = 3/2, ρK → ρK∗for I = 3/2, and πK∗ → ρK for I = 3/2, which take place in hadronicmatter. We obtain the temperature-dependent meson masses from the Schr¨odinger equation withthe potential that is given by perturbative quantum chromodynamics (QCD) with loop correctionsat short distances, that becomes a distance-independent and temperature-dependent potential atlong distances, and that has a spin-spin interaction with relativistic modifications. In the first Bornapproximation with the quark-interchange mechanism, the temperature dependences of the potential,the meson masses, and the mesonic quark-antiquark wave functions bring about a temperaturedependence of the unpolarized cross sections for the seven nonresonant reactions. Noticeably, rapidchanges in the π and K radii cause a rapid increase in peak cross sections, except for the πK∗ → ρKcross section, as the temperature approaches a critical temperature. Compared to in-vacuum crosssections, the medium modifications of the cross sections are remarkable.

Optimization for Cooling System of Batteries Having Porous Material Using Design of Experiments

Zhen-Zhe Li,Dong-Ji Xuan,Yong Li,Yun-De Shen 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

A hybrid power composed of fuel cell and batteries has become the reasonable strategy for hybrid electric vehicles. On the contrary,the produced heat by batteries can affect the total performance of hybrid electric vehicles significantly. In this paper, analysis methodsand optimization strategy were constructed for obtaining the high performance cooling system for batteries having porous material. At first, a numerical method for obtaining the temperature distribution of battery pack including porous material was developed byusing CFD technique. In the following step, the cooling systems for batteries with porous material or not were compared for showingthe merit of the cooling system for batteries having porous material. Ultimately, an optimization strategy based on D-optimal DOEmethod was obtained through a real optimal design process. There was 13.3% reduction on the view of the root mean squaretemperature between batteries compared with the original cooling system for batteries as shown in the optimization result. Theconstructed analysis method and optimization strategy can be used to improve the performance of the cooling system for batteries,and these works have made the theoretical basis for simulation and optimization of the cooling system for batteries.

Synthesis and Biological Evaluation of Heterocyclic Ring-substituted Chalcone Derivatives as Novel Inhibitors of Protein Tyrosine Phosphatase 1B

Zhen-Hua Chen,Liang-Peng Sun,Wei Zhang,Qiang Shen,Li-Xin Gao,Jia Li,Hu-Ri Piao 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5

Protein tyrosine phosphatase 1B (PTP1B) is a key factor in negative regulation of the insulin pathway, and is a promising target for the treatment of type-II diabetes, obesity and cancer. Herein, compound (4) was first observed to have moderate inhibitory activity against PTP1B with an IC50 value of 13.72 ± 1.53 μM. To obtain more potent PTP1B inhibitors, we synthesized a series of chalcone derivatives using compound (4) as the lead compound. Compound 4l (IC50 = 3.12 ± 0.18 μM) was 4.4-fold more potent than the lead compound 4 (IC50 = 13.72 ± 1.53 μM), and more potent than the positive control, ursolic acid (IC50 = 3.40 ± 0.21 μM). These results may help to provide suitable drug-like lead compounds for the design of inhibitors of PTP1B as well as other PTPs.

Coloring mechanism of celadon glazes from Yaozhou kiln

Zhen Sang,Fen Wang,Xiaojuan Yuan,Shurui Shen,Jing Wang,Xiaohong Wei 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6

The Five Dynasty sky-green, Song dynasty olive-green and Jin dynasty moon-white glazes are three typical glazes of theYaozhou celadon. In this work, the coloring mechanism of the three celadon glazes were compared and analyzed by usingcolorimeter, EDXRF, XRD, XPS and Raman spectrometer. The results indicate that the content of Fe2O3 is proportional tothe depth of the glaze colors. The Raman Ip value indicates that the firing temperature of the Song dynasty olive-green glazewas the highest, followed by the Five Dynasty, and then the Jin dynasty. The lower firing temperature and dense bubbles areimportant causes of the high opacification of the Jin moon-white glaze. The ratio of Fe2+ to Fe3+ in the glaze is directlyproportional to the b* value, which is the main reason for why the Yao celadon glaze colors are yellow-green in Song, butbluish in the Five Dynasty and Jin dynasty.

Geolocation Spectrum Database Assisted Optimal Power Allocation: Device-to-Device Communications in TV White Space

( Zhen Xue ),( Liang Shen ),( Guoru Ding ),( Qihui Wu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12

TV white space (TVWS) is showing promise to become the first widespread practical application of cognitive technology. In fact, regulators worldwide are beginning to allow access to the TV band for secondary users, on the provision that they access the geolocation database. Device-to-device (D2D) can improve the spectrum efficiency, but large-scale D2D communications that underlie TVWS may generate undesirable interference to TV receivers and cause severe mutual interference. In this paper, we use an established geolocation database to investigate the power allocation problem, in order to maximize the total sum throughput of D2D links in TVWS while guaranteeing the quality-of-service (QoS) requirement for both D2D links and TV receivers. Firstly, we formulate an optimization problem based on the system model, which is nonconvex and intractable. Secondly, we use an effective approach to convert the original problem into a series of convex problems and we solve these problems using interior point methods that have polynomial computational complexity. Additionally, we propose an iterative algorithm based on the barrier method to locate the optimal solution. Simulation results show that the proposed algorithm has strong performance with high approximation accuracy for both small and large dimensional problems, and it is superior to both the active set algorithm and genetic algorithm.

Flux Sliding-mode Observer Design for Sensorless Control of Dual Three-phase Interior Permanent Magnet Synchronous Motor

Shen, Jian-Qing,Yuan, Lei,Chen, Ming-Liang,Xie, Zhen The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.5

A novel equivalent flux sliding-mode observer (SMO) is proposed for dual three-phase interior permanent magnet synchronous motor (DT-IPMSM) drive system in this paper. The DT-IPMSM has two sets of Y-connected stator three-phase windings spatially shifted by 30 electrical degrees. In this method, the sensorless drive system employs a flux SMO with soft phase-locked loop method for rotor speed and position estimation, not only are low-pass filter and phase compensation module eliminated, but also estimation accuracy is improved. Meanwhile, to get the regulator parameters of current control, the inner current loop is realized using a decoupling and diagonal internal model control algorithm. Experiment results of 2MW-level DT-IPMSM drives system show that the proposed method has good dynamic and static performances.

Convergence of descent method with new linesearch

Zhen-Jun Shi,Jie Shen 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.20 No.1-2

Convergence of supermemory gradient method

Zhen-Jun Shi,Jie Shen 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.24 No.1

In this paper we consider the global convergence of a newsupermemory gradient method for unconstrained optimization problems.New trust region radius is proposed to make the new method converge sta-bly and averagely, and it will be suitable to solve large scale minimizationproblems. Some global convergence results are obtained under some mildconditions. Numerical results show that this new method is eective and

A Study on Control of Heater Power and Heating Time for Thermoforming

Zhen-Zhe Li,Guang Ma,Dong-Ji Xuan,Seoung-Yun Seol,Yun-De Shen 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.

Obtaining a uniform thickness of the final product using thermoforming is difficult, and the thickness distribution depends strongly on the distribution of the sheet temperature. In this paper, the time-dependent temperature distribution of the total sheets in the storing stage was studied because the temperature after the storing stage is the initial temperature of the heating process. An analytic solution for simulating the storing stage was derived. Using the solved analytic solution, the time-dependent temperature distribution of the total sheets was found out under the condition of assuming that the temperature-dependent specific heat of the ABS sheets was a certain constant value. Finally, the control method for a successful thermoforming using the heater power or heating time was researched in order to improve the quality of the final products. The results show that the satisfied temperature distribution can be obtained by adjusting the heater power or heating time. The method for analysis in this study will be used to improve the quality of the final products.