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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 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.
( Zhihua Yang ),( Xiaoyi Liu ),( Changbao Guo ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The Xianshuihe Fault in the southwest China presents strong activities Since the Holocene. Under the joint action of strong earthquakes, fault activities and heavy rainfall, the landslides have shown high development intensity in the Xianshuihe fault zone and bring a serious threat to the safety of human life and property. In this study, the SBAS-InSAR method and ALOS PALSAR data (15 scenes) are used to calculate and analyze the deformation characteristics of the creeping landslide between 2007 and 2011. The results show that the active effect of the Xianshuihe Fault has an important influence on the landslide development and occurrence. The closer distance to the Xianshuihe Fault is, the more stable coherent points is, the greater landslide cumulative displacement is. A total of 98 creeping landslides in the Xianshuihe Fault zone are identified, which develop as a linear distribution on both sides of the Xianshuihe Fault. And, the surface deformation and development characteristics of several typical creeping landslides are analyzed in-depth. So, the InSAR method can be used to effectively analyze the slow surface deformation, change laws and development characteristics of creeping landslide in the active fault zone. The study results have a certain guiding role on the landslide prevention and mitigation along the Xianshuihe Fault zone and the similar tectonic activity area.
Bacthing Auditing of Data in Multicloud Storage
Zhihua Xia,Xinhui Wang,Xingming Sun,Yafeng Zhu,Peng Ji,Jin Wang 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
Cloud storage enables users to outsource their data to cloud servers and enjoy the on-demand services. However, this new paradigm also introduces integrity threats toward user’ outsourced data. This paper develops an efficient auditing mechanism, which support batch auditing for multiple data files in multi-cloud environment. By constructing a sequence-enforced Merkle Hash Tree, the proposed protocol can resist the replace attack. By using the bilinear map, the proposed protocol achieves stateless and transparent verification. By putting the computation of intermediate values of the verification on cloud servers, our method can greatly reduce the computing burden of the auditor. The performance analysis proves the good efficiency of the proposed protocol.
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.