RCEP협정이 한중일 산업무역에 미치는 영향에 관한 연구

Yang Zhenhua,우광명 경남대학교 산업경영연구소 2022 지역산업연구 Vol.45 No.4

After the RCEP comes into force, the trade cooperation clauses such as tariff reduction between China, Korea and Japan formed by RCEP Agreement will inevitably have an impact on the industrial trade among China, Korea and Japan. Whether the impacts on trade of different industries are positive or negative, and the degree of influence, are the main research objectives of this study. This research uses the GTAP model and adopts the phased dynamic recursive method for simulation. TMS parameters are set according to RCEP Agreement among China, Japan and Korea. After the impact with TMS values, The parameters such as qxw, qiw and qxs are selected to analyze the simulation results. The implementation of RCEP China-Japan-Korea Trade Cooperation Clauses, the trade Scale of China, Japan and Korea has been promoted, but the degree is different. Specifically, in the industry trade, In terms of industries, there are big differences in the impact of trade among the four sectors and ten industries among China, Japan and Korea. The impact of trade in some industries such as the capital-intensive industries trade is extremely significant, while the impact on other industries such as mineral trade is limited. For the long-term development of industrial trade between China, Japan and Korea under the RCEP agreement, this study finally puts forward suggestions such as the highly integrated regional value chain cooperation between China, Japan and Korea to promote the development of industrial trade.

First-principles study on doping effect of Sn in BiF3 as cathode materials for Li-ion battery

Zhenhua Yang,Shuncheng Tan,Yunqing Huang 한국물리학회 2016 Current Applied Physics Vol.16 No.1

First-principles calculations were carried out to investigate the structural relaxation, formation energy, electronic structure and electrochemical properties of Sn-doped BiF3. When Sn was doped into BiF3, two common oxidation states of Sn, þ2 and þ4, were considered. In addition, some typical neutral and charge defects (Sn0 Bi,Sn1 Bi ,Sn1þ Bi ,V2 Bi1 V2 Bi2 and V0 F ) were discussed in detail. Calculated formation energies indicate that Sn4þ ion is much easier to dope into BiF3 than Sn2þ ion. When Fermi level lies at the bottom of conduction band, Sn1/32Bi30/32F3 with V2 Bi1 (Bi vacancy defect) induced by Sn4þ ion doping has the most stable structure under the rich-F growth condition. Here, DmSn, DmBi and DmF are 13.18 eV,9.71 eV and 0, respectively. What's more, the crystal structure, electronic structure and electrochemical properties of Sn1/32Bi30/32F3 with V2 Bi1 were further investigated. It is found that the crystal volume of Sn1/32Bi30/32F3 with V2 Bi1 is larger than that of pure BiF3 because the length of BieF bond around V2 Bi1 in the Sn1/32Bi30/ 32F3 becomes much longer relative to the length of BieF bond in the pure BiF3. Besides, the calculated band gap of Sn1/32Bi30/32F3 with V2 Bi1 is 2.70 eV, which is smaller than that of pure BiF3. Furthermore, Sn1/ 32Bi30/32F3 with V2 Bi1 has better theoretical voltage and theoretical capacity than pure BiF3.

First-principles study on the doping effects of Al in a-MnO2

Zhenhua Yang,Xianyou Wang,Yunqing Huang 한국물리학회 2015 Current Applied Physics Vol.15 No.11

In this paper, first-principles calculations have been implemented to study the structural relaxation, formation energies and electronic structure of Al doped a-MnO2. Both Al insertion and Al substitution reactions in the a-MnO2 were considered. Calculated formation energies indicate that Mn atom is easier to be displaced by Al atom under the O-rich growth condition compared with Al insertion reaction. Besides, it can be found that Al doping can afford acceptor impurity level which can accommodate electrons, thus contributing to the improvement of conductivity of a-MnO2. The conductivity of a-MnO2 is gradually improved with the increasing doping concentration of Al, and Al0.0417Mn0.9583O2 exhibits the best conductivity. Lastly, the electronic structure of Al0.0417Mn0.9583O2 was further investigated by analysis of total charge density and Bader charge. It is clear that Al doping can afford more electrons for a-MnO2, which also contributes to improvement of its conductivity.

A Study on American Nuclear Safety Legal System from the Persp ective of International Law 国际法视阈下美国核安全法律制度研究

Zhenhua Yang 이준국제법연구원 2017 China and WTO Review Vol.3 No.1

First-principles study of Ti doping in FeF3$0.33H2O

Zhenhua Yang,Zhijuan Zhang,Yalong Yuan,Yunqing Huang,Xianyou Wang,Xiaoying Chen,Shuangying Wei 한국물리학회 2016 Current Applied Physics Vol.16 No.8

The effect of Ti doping on the geometrical and electronic structures of FeF3$0.33H2O are systematically investigated by using the first principles calculations. We focused on TixFe1-xF3$0.33H2O systems, in which x is equal to 0, 0.08, 0.17 and 0.25, respectively. Different kinds of Ti dopant sites are checked and the most stable structure can be obtained by comparison of total energy. The crystal volume of TixFe1- xF3$0.33H2O expands gradually with increasing Ti doping concentration. Calculated formation energies indicate TixFe1-xF3 is easiest to fabricate and the difficulty of Ti doping FeF3 with hexagonal-tungstenbronze( HTB) structure decreases with the increase of Ti doping concentration under the Fe-rich and Ti-rich growth conditions. Moreover, TixFe1-xF3$0.33H2O is thermodynamically stable, indicating that water molecule can preferentially occupy one-dimensional cavity in the TixFe1-xF3. The band gap of TixFe1-xF3$0.33H2O decreases with increasing Ti doping concentration and Ti0.25Fe0.75F3$0.33H2O exhibits character of half metal, indicating that the conductivity of FeF3$0.33H2O can be improved by Ti-doping. Besides, it can be confirmed that Ti-doping also can broaden the hexagonal cavity in the FeF3$0.33H2O by analyzing the crystal structure of FeF3$0.33H2O and TixFe1-xF3$0.33H2O. With excellent conductivity and larger hexagonal cavity, TixFe1-xF3$0.33H2O can afford open diffusion channels. Therefore, Li ions can remain unblocked, which is beneficial to fast charge and discharge.

Fluorinated/Non-Fluorinated Sulfonated Polynaphthalimides as Proton Exchange Membranes

Yang Song,Chang Liu,Dianfu Ren,Liwei Jing,Zhenhua Jiang,Baijun Liu 한국고분자학회 2013 Macromolecular Research Vol.21 No.5

Two -SO3H containing diamine monomers, 2,5-bis(4-amino-2-trifluoromethylphenoxy)benzenesulfonic acid and 2,5-bis(4-aminophenoxy)benzenesulfonic acid were successfully synthesized through a typical aromatic nucleophilic substitution reaction followed by a reduction reaction, respectively. Derived from the diamine monomers,two series of sulfonated naphthalic polyimides (polynaphthalimides) containing ether and ketone linkages were synthesized through a “one pot” polymerization reaction. Some properties including thermal stability, mechanical properties, water uptake, swelling dimensional ratio, methanol permeability, and proton conductivity were thoroughly investigated. Some exhibited attractive properties as proton exchange membranes. It was found that the fluorinated series (CF3-SPI-X) exhibited higher dimensional stability and lower methanol permeability in comparison with non-fluorinated ones (SPI-X) at the same -SO3H group content.

Parametric analysis on diagonal bracing joints connected with self-tapping screw

Zhenhua Xu,Guoliang Bai,Biao Liu,Jiarui Li,Yifan Yang 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.1

In this paper, a three-dimensional finite element model (FEM) was established to study the performance of sliding resistance on the diagonal bracing joints of prefabricated steel frame (PSF) connected with self-tapping screw. In addition, the load-displacement curves of the joints were well verified by the test results, and a parametric study was conducted using the validated models to investigate the effect of steel grade, thickness of the tapped plate, the margin of bolt hole, the end and the central distance of bolt hole. The results showed that with the increase of steel grade, thickness of the tapped plate and the distance of the bolt holes, the anti-slide stiffness and the ultimate bearing capacity of the joint were significantly improved. It was recommended that steel grade should be Q345, Q390 or above. It was advisable to take the thickness of the tapped plate at 0.7d0 ~ 1.0d0, take the margin of bolt hole at 1.2d0 ~ 1.6d0, the central and the end distance of bolt hole should be greater than 2.0d0 and 1.2d0, respectively. The results could provide reference for engineering design.

Ultrathin MEMS thermoelectric generator with Bi2Te3/(Pt, Au) multilayers and Sb2Te3 legs

Liu Yang,Mu Erzhen,Wu Zhenhua,Che Zhanxun,Sun Fangyuan,Fu Xuecheng,Wang Fengdan,Wang Xinwei,Hu Zhiyu 나노기술연구협의회 2020 Nano Convergence Vol.7 No.8

Multilayer structure is one of the research focuses of thermoelectric (TE) material in recent years. In this work, n-type 800 nm ­Bi 2 Te 3 /(Pt, Au) multilayers are designed with p-type ­Sb 2 Te 3 legs to fabricate ultrathin microelectromechanical systems (MEMS) TE devices. The power factor of the annealed ­Bi 2 Te 3 /Pt multilayer reaches 46.5 μW cm −1 K −2 at 303 K, which corresponds to more than a 350% enhancement when compared to pristine ­Bi 2 Te 3 . The annealed ­Bi 2 Te 3 /Au multilayers have a lower power factor than pristine ­Bi 2 Te 3 . The power of the device with ­Sb 2 Te 3 and ­Bi 2 Te 3 /Pt multilayers measures 20.9 nW at 463 K and the calculated maximum output power reaches 10.5 nW, which is 39.5% higher than the device based on ­Sb 2 Te 3 and ­Bi 2 Te 3 , and 96.7% higher than the ­Sb 2 Te 3 and ­Bi 2 Te 3 /Au multilayers one. This work can provide an opportunity to improve TE properties by using multilayer structures and novel ultrathin MEMS TE devices in a wide variety of applications.

Atomic insights into regulation of graphene sheets vertically attached to the FeF3·0.33H2O (002) surface by cation doping

Yanjun Pan,Yang Li,Jinda Luo,Xianyou Wang,Zhenhua Yang 한국물리학회 2019 Current Applied Physics Vol.19 No.10

Tightly and vertically attached graphene nanosheets (GNS) on the surface of FeF3·0.33H2O is extremely desirable to substantially accelerate electron transport, promoting rate capability of FeF3·0.33H2O. Based on present experiment and calculated surface energies, firstly, it has confirmed that F-terminated FeF3·0.33H2O (002) surface (FeF3·0.33H2O (002)-F) is more stable than FeF-terminated FeF3·0.33H2O (002) surface (FeF3·0.33H2O (002)- FeF) when μF varies from −1.92 eV to −0.30 eV. Then, by analysis of the interfacial structure and adsorption energies, it was proposed that GNS is incline to stand vertically on the FeF3·0.33H2O (002) surface via C–F bond. However, structural stability of FeF3·0.33H2O/GNS heterostructure is gradually weakened with increasing the number of GNS layers. Therefore, we further reported the important role of optimal doping element (Hf) in strengthening the vertical adsorption behavior of GNS on FeF3·0.33H2O (002) surface via thorough doping element search. And it turns out interfacial structure with hexa-coordinate polyhedron consists of Hf, F and O atoms is formed by strong hybridization of atomic orbits, which induces the interaction between FeF3·0.33H2O (002) surface and GNS to be profoundly strengthened.

Effect of Anhydride Grafting Agent on Trap Levels of Low-Density Polyethylene

Lijuan He,Zhenhua Yuan,Xiong Yang,Huiqing Niu,Chao Zhu,Dawei Li,Lei Zhao,Chuntian Chen 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5

Trap distribution of the low-density polyethylene(LDPE) modified by anhydride grafting agent was studied and the effect of grafting agent on the trap levels was analyzed by the method of Photo-stimulated Discharge in this paper. Different concentrations and types of same concentration of LDPE modified by anhydride grafting agent were measured by using continuous UV scanning. The results showed that different concentrations and types of grafting agent had effect on trap levels distribution of LDPE. The trap depth would decrease with the anhydride grafting agent content increasing and increase with its damaged condition increasing when anhydride grafting agent was destroyed. Anhydride grafting agent are widely applied to the production and research of high pressure insulating polyethylene materials. The purpose of this paper is to elaborate the effect of anhydride grafting agent on the insulating properties of polyethylene material and explain the strongest binding capacity of anhydride grafting agent to space charge.