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ENVIRONMENTAL DYNAMICS IN AN INTEGRATED WALRASIAN-GENERAL EQUILIBRIUM AND NEOCLASSICAL-GROWTH THEORY
Wei-Bin Zhang 중앙대학교 경제연구소 2014 Journal of Economic Development Vol.39 No.3
This study deals with interactions of economic growth and environmental change with heterogeneous households. The analytical framework is built by integrating the three important theories in economics - the Walrasian general equilibrium theory, the neoclassical growth theory, and the neoclassical growth model with endogenous environment. The three theories are integrated by applying Zhang’s approach to household behavior. The economic system consists of one capital goods sector, one consumer goods sector, one environmental sector, and any number (of types) of households. The motion is described by a set of differential equations. For illustration, we simulated the motion of the economic system with three groups. The comparative analyses provide some insights into the complexity of economic growth with environment. For instance, the study by Grossman and Krueger (1995, p. 353) identifies no evidence that “environmental quality deteriorates steadily with economic growth.” Our simulation indicates that although the conclusion made by Crossman and Krueger holds for the national economy, but is invalid for a certain group.
Wei‑dong Zhang,Junye Ren,Bin Liu,Yong Liu,Zhenggang Wu,Jingwen Qiu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
Ti–36Nb–2Ta–3Zr–0.35O (TNTZO) alloy is an excellent candidate for biomedical applications. In this study, a new methodcombining cold-swaging and cold-drawing was used to fabricate the TNTZO alloy wires with 0.3 mm diameter for orthodonticapplications. The microstructure and mechanical properties of cold-drawn and annealed TNTZO wires (referred toas TNTZO0.3and TNTZO0.3(HT), respectively) were investigated. The results show that the microstructure of cold drawnTNTZO0.3consists of main-sized elongated grains with 70 nm width. After annealing at 700 °C for 5 min, the microstructureof TNTZO0.3(HT) wires becomes equiaxial with a grain size of ~ 5 μm. The cold drawn TNTZO0.3wires exhibit improvedmechanical properties, higher tensile strength (about 1000 MPa) and similar elastic modulus (69 GPa), compared to annealedTNTZO0.3(HT) wires. Besides, TNTZO0.3has higher creep resistance and lower stress exponent (around 2), compared to Tiwires and TC4 wires with the same diameter. These results prove that TNTZO0.3wires have most of the ideal characteristicsof orthodontic wires.
Growth and Agglomeration of a Small-Open Multi-Regional Economy
( Wei Bin Zhang ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2007 Journal of Economic Integration Vol.22 No.3
We study economic growth of a multi-regional small open economy in a perfectly competitive economy. The national economy consists of multiple regions and each region has one production sector and one housing sector. Following the traditional literature of small open economies, we assume that the rate of interest is fixed in international market. The production side is the same as in the neoclassical growth theory. Households move freely among regions, equalizing utility level among regions by choosing housing, goods and saving. A region`s amenity is endogenous, depending on the region`s output and population. We explicitly solve the dynamics of the multi-regional economy. The system has a unique stable equilibrium point. We simulate the motion of the model and examine effects of changes in the rate of interest, the preference, and amenity parameters. We show, for instance, that a productivity improvement in the region with lowest productivity reduces the GDP and GNP and a rise in the preference for large cities may accelerate agglomeration of the population and economic activities into a region with high productivity.
Wei-Bin Ni,De-Hao Qiao,Hong-Wei Sun,Xu Zhang,Zhong-Wen Zhang,Shao-Jie Wang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
Precast concrete frame structure with nonrectangular columns are becoming attractive to researchers and engineers owing to advantages such as avoiding column protrusion from walls and saving space. This paper presents the experimental investigation of a full-scale precast concrete frame structure with L-shaped columns (PCFS) subjected to reverse cyclic loading. The precast connection adopted grouted anchor connection. As a comparison and benchmark, one full-scale monolithic sample (RCFS) was also tested. The results indicates that the greater steel ratio in the grouted anchor connection region leads to a high local stiffness of the elements, which contributed to delaying occurrence of the first crack at the grouting holes. The failure mode, lateral load capacity, stiffness degradation, load-carrying capacity degradation, energy-dissipating capacity, ductility and interlayer residual deformation were compared between two specimens. PCFS specimen exhibited comparatively better hysteretic behavior, energy-dissipating capacity, residual deformation-resisting capacity and ductility. For RCFS and PCFS specimens, the peak load difference was within 7%. About 15% increases in ductility were observed for PCFS specimen compared with RCFS specimen. The test results would provide reference for the application of the precast concrete structure with nonrectangular columns in the new residential buildings.
A Three-Sector Spatial Growth Model of a Small Open Economy with Capital Accumulation
( Wei Bin Zhang ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2009 Journal of Economic Integration Vol.24 No.2
This paper presents a growth model of a small open economy with economic geography. The economy has three - industrial, services and housing - sectors. The economy is located along a line segment and land is for residential use. The model synthesizes the four well-known models in neoclassical growth theory and urban economics - the Solow growth model, Uzawa`s two-sector model, the Alonso urban model, and the Muth housing model - in the context of a small open economy. We analyze the dynamics of a spatial economy and simulate the model over time and space. We show how changes in some parameters, such as the rate of interest and domestic preference, can affect economic structures and land use of the small economy. For instance, the simulation results show that as the rate of interest is increased in the global market, the domestic wage rate, the output levels per worker of the industrial and service sectors, the capital intensities of the three sectors, the capital employed by the three sectors, the national output are reduced, the price of services, the consumption levels of goods, services and housing, the wealth per capita are increased. The labor employment of the industrial sector is reduced and the labor employment of service sector is increased. The housing rent is increased and the land rent is reduced due to the rise in the rate of interest.
Uniqueness of Entire Functions and Differential Polynomials Sharing one Value
Zhang, Xiao-Bin,Meng, Da-Wei Department of Mathematics 2014 Kyungpook mathematical journal Vol.54 No.3
In this paper, we shall utilize Nevanlinna value distribution theory to study the uniqueness problems on entire functions and differential polynomials sharing one value. Our theorems improve or generalize some results of Zhang and Lin, Chen, Zhang, Lin and Chen.
Capital and Unemployment in a Two-Class Growth Model
Wei-Bin Zhang 서울대학교 경제연구소 1993 Seoul journal of economics Vol.6 No.4
The paper proposes a simple dynamic one-sector and two-class growth model with endogenous unemployment and government intervention. The model explains dynamics of capital owned by the two classes and the market structure with labor unemployment. The dynamic properties of the model and effects of changes in some parameters are investigated.
A MULTI - COUNTRY FREE TRADE MODEL WITH CAPITAL ACCUMULATION
ZHANG, WEI BIN 한국국제경제학회 1994 International Economic Journal Vol.8 No.1
The paper develops a multi-country endogenous growth model to investigate possible causes for the existence and persistence of trade patterns among countries with different preferences and production functions and perfect international capital mobility. Private consumption and savings are derived from maximizing utility level which is dependent upon current levels of wealth and consumption functions may affect the trade patterns in the dynamic competitive world economy. [F11,O41]