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( Zhihua Shen,Yafeng Xia ) 경남대학교 극동문제연구소 2012 ASIAN PERSPECTIVE Vol.36 No.1
Based on newly available Chinese and Russian archival documents and oral histories, this article examines the origins and evolution of Soviet policies concerning China`s nuclear weapons program from 1954 to 1960. The article argues that Soviet premier Nikita Khrushchev consented only to assist China in developing nuclear energy in 1954 only because he needed Mao`s support in a domestic political struggle. But the Taiwan Strait crisis of 1958 unnerved the Russians, leading Khrushchev in June 1959 to rescind his promise to deliver a teaching model A-bomb to the Chinese. By August 1960 all Soviet specialists working on China`s nuclear weapons program were recalled. Nonetheless, the Soviet aid laid the foundation for China`s fledgling nuclear industry.
Zhihua Chen,Zhongwei Zhao,Han Zhu,Xiaodun Wang,Xiangyu Yan 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.2
Long-span spatial structures have advantages over other structural systems in terms of novelty and aesthetics in architectural form. However, the complexity of stress distribution causes these kinds of structures to change significantly between the construction and utilization stages. One-time loading method was used in the traditional design method to calculate and evaluate structural stress and structural deflection, either of which could cause problems in component size and residual stress during construction process. Therefore, construction simulation analysis of these structures must be performed. Element birth and death technology and step-by-step model technology (SSMT) are the main approaches in the finite element method used in construction analysis. This paper proposes a theory basis for the SSMT that was used in the constructional analysis of the Yujiapu Railway Station Building. Results obtained by the proposed method were compared with those by element birth and death technology. In addition, the preset construction deformation value was calculated to validate the correctness and efficiency of the proposed method.
Stability of zeros of power series equations
Zhihua Wang,Xiuming Dong,Themistocles M. Rassias,정순모 대한수학회 2014 대한수학회보 Vol.51 No.1
We prove that if |a1| is large and |a0| is small enough, then every approximate zero of power series equation P∞ n=0 anxn = 0 can be approximated by a true zero within a good error bound. Further, we obtain Hyers-Ulam stability of zeros of the polynomial equation of degree n, anzn + an−1zn−1 + · · · + a1z + a0 = 0 for a given integer n > 1.
Characterizations of geometrical properties of Banach spaces using Ψ-direct sums
Zhihua Zhang,Lan Shu,Jun Zheng,Yuling Yang 대한수학회 2013 대한수학회보 Vol.50 No.2
Let X be a Banach space and Ψ a continuous convex function on ∇K+1 satisfying certain conditions. Let (X⊕X⊕· · ·⊕X)Ψ be the Ψ-direct sum of X. In this paper, we characterize the K strict convexity, K uniform convexity and uniform non-lN 1 -ness of Banach spaces using -direct sums.
Generalized forms of Swiatak's functional equations with involution
Zhihua Wang 대한수학회 2019 대한수학회보 Vol.56 No.3
In this paper, we study two functional equations with two unknown functions from an Abelian group into a commutative ring without zero divisors. The two equations are generalizations of Swiatak's functional equations with an involution. We determine the general solutions of the two functional equations and the properties of the general solutions of the two functional equations under three different hypotheses, respectively. For one of the functional equations, we establish the Hyers-Ulam stability in the case that the unknown functions are complex valued.
Zhihua Wang,Fenghao Wang,Zhenjun Ma,Mengmeng Bai,Shuai Liu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3
Air-source heat pumps (ASHPs) have been widely used in domestic buildings. However, the regulation performance of ASHPs for indoor thermal comfort control is influenced by the factors such as cold draft and slow response to the variation in room temperature. In this paper, a range of experiments was carried out for 14 ASHPs in an indoor environmental chamber under both cooling and heating conditions. A multi-index comprehensive evaluation model including the questionnaire survey method, the weighted scoring method and the quartile algorithm method was then adopted to analyze the tested data in order to give some intuitive indices to evaluate the regulation performance of ASHPs for indoor thermal comfort control. The results showed that unsatisfied factor of the overall thermal comfort under the cooling conditions was reached to 71 %. Besides, the precision of the temperature control was poor in both cooling and heating conditions, which manifesting ASHPs need a novel matched adjust mode and more intelligent control system to meet thermal comfort requirement. This study provided a reference basis for evaluating ASHP’s regulation performance on indoor thermal comfort.
Bayesian methods for dealing with missing data problems
Zhihua Ma,Guanghui Chen 한국통계학회 2018 Journal of the Korean Statistical Society Vol.47 No.3
Missing data, a common but challenging issue in most studies, may lead to biased and inefficient inferences if handled inappropriately. As a natural and powerful way for dealing with missing data, Bayesian approach has received much attention in the literature. This paper reviews the recent developments and applications of Bayesian methods for dealing with ignorable and non-ignorable missing data. We firstly introduce missing data mechanisms and Bayesian framework for dealing with missing data, and then introduce missing data models under ignorable and non-ignorable missing data circumstances based on the literature. After that, important issues of Bayesian inference, including prior construction, posterior computation, model comparison and sensitivity analysis, are discussed. Finally, several future issues that deserve further research are summarized and concluded.
Zhihua Zheng,Jiasi Chen,Keping Wu,Yan Lei,Mingcheng Huang,Lokyu Cheng,Hui Guan,Jiawen Lin,Ming Zhong,Xiaohua Wang 대한내분비학회 2023 Endocrinology and metabolism Vol.38 No.2
Background: Ferroptosis, which is caused by an iron-dependent accumulation of lipid hydroperoxides, is a type of cell death linked todiabetic kidney disease (DKD). Previous research has shown that fatty acid binding protein 4 (FABP4) is involved in the regulation of ferroptosis in diabetic retinopathy. The present study was constructed to explore the role of FABP4 in the regulation of ferroptosis in DKD. Methods: We first detected the expression of FABP4 and proteins related to ferroptosis in renal biopsies of patients with DKD. Then, we used a FABP4 inhibitor and small interfering RNA to investigate the role of FABP4 in ferroptosis induced by high glucosein human renal proximal tubular epithelial (HG-HK2) cells. Results: In kidney biopsies of DKD patients, the expression of FABP4 was elevated, whereas carnitine palmitoyltransferase-1A (CPT1A), glutathione peroxidase 4, ferritin heavy chain, and ferritin light chain showed reduced expression. In HG-HK2 cells, the induction of ferroptosis was accompanied by an increase in FABP4. Inhibition of FABP4 in HG-HK2 cells changed the redox state, suppressing the production of reactive oxygen species, ferrous iron (Fe2+), and malondialdehyde, increasing superoxide dismutase, and reversing ferroptosis-associated mitochondrial damage. The inhibition of FABP4 also increased the expression of CPT1A, reversed lipiddeposition, and restored impaired fatty acid β-oxidation. In addition, the inhibition of CPT1A could induce ferroptosis in HK2 cells. Conclusion: Our results suggest that FABP4 mediates ferroptosis in HG-HK2 cells by inhibiting fatty acid β-oxidation.