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FIXED POINT THEOREMS FOR SOME CONTRACTIVE MAPPINGS OF INTEGRAL TYPE WITH w-DISTANCE
LIU, ZEQING,WANG, HAOYUE,LIU, NA,KANG, SHIN MIN The Korean Society for Computational and Applied M 2019 Journal of applied mathematics & informatics Vol.37 No.5
The existence, uniqueness and iterative approximations of fixed points for some contractive mappings of integral type defined in complete metric spaces with w-distance are proved. Four examples are given to demonstrate that the results in this paper extend and improve some well-known results in the literature.
FIXED POINT THEOREMS FOR SOME CONTRACTIVE MAPPINGS OF INTEGRAL TYPE WITH w-DISTANCE
ZEQING LIU,Haoyue Wang,Na Liu,강신민 한국전산응용수학회 2019 Journal of applied mathematics & informatics Vol.37 No.5
The existence, uniqueness and iterative approximations of fixed points for some contractive mappings of integral type defined in complete metric spaces with w-distance are proved. Four examples are given to demonstrate that the results in this paper extend and improve some well-known results in the literature.
Rate-Splitting for Intelligent Reflecting Surface-Assisted CR-NOMA Systems
You, Haoyu,Hongwu, Liu,Bai, Zhiquan,Tsiftsis, Theodoros,Kwak, Kyung Sup 한국통신학회 2023 Journal of communications and networks Vol.25 No.1
Intelligent reflecting surface (IRS) has been re-garded as promising technique to improve system performancefor wireless communications. In this paper, we propose a rate-splitting (RS) scheme for an IRS-assisted cognitive radio-inspirednon-orthogonal multiple access (CR-NOMA) system, where theprimary user’s (PU’s) quality of service (QoS) requirementsmust be guaranteed to be same as in orthogonal multipleaccess. Assisted by IRS, the threshold for the PU’s tolerableinterference power is improved, which in turn makes it possibleto increase the achievable rate for the secondary user (SU). The optimal transmit power allocation, target rate allocation,and successive interference cancellation (SIC) decoding order arejointly designed for the proposed RS scheme. Taking into accountthe statistics of the direct link and IRS reflecting channels, closed-form expression for the PU’s and SU’s outage probabilities arerespectively derived. Various simulation results are presentedto clarify the enhanced outage performance achieved by theproposed RS scheme over the existing CR-NOMA and IRS-assisted CR-NOMA schemes.
Five new species of Stenothemus Bourgeois from Guangxi, China (Coleoptera, Cantharidae)
Ge Shujuan,Liu Haoyu,Yang Xing-ke,Yang Yuxia 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
Five new species of Stenothemus Bourgeois, 1907 from Guangxi, China are described, S. normalis sp. nov., S. flavicans sp. nov., S. nigripennis sp. nov., S. elongaticeps sp. nov. and S. maculaticollis sp. nov.. They are illus trated with habitus photos and aedeagi of males, also abdominal sternites VIII and internal genitalia of females. A key for the identification of the above species is provided.
The Text Mining Analysis of Macau’s Participation in International Organizations
Wu Shianghau,Liu Chengkun,Shi Haoyu,Pang Chuan 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
In recent years, Macau has actively participated in international organizations according to the Macau Basic Law. After fifteen years of regaining sovereignty by China, Macau has faced some internal and external challenges. In order to comprehend the new policy directions regarding Macau’s participation in international organizations, this paper made the depth interviews and applied the text mining analysis to the interviews responses. Through applying the random forests model and fruit fly optimization algorithm to keywords classification, the study concluded several points related to Macau’s participation in international organizations.
Four new species of the genus Rhagonycha (Coleoptera: Cantharidae) from Southeast China
Xiaoyun Feng,Liu Haoyu,Yang Xing-ke,Yang Yuxia 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
Four new species of Rhagonycha Eschscholtz, 1830 are described, including Rh. hainanensis sp. nov. (China, Hainan), Rh. nigroimpressimima sp. nov. (China, Fujian), Rh. tumida sp. nov. and Rh. nigrotibia sp. nov. (China, Guangxi). These new species are illustrated with habitus, aedeagi, abdominal sternites VIII and internal genitalia of females. Besides, the female internal genitalia of Rh. nigroimpressa (Pic, 1922a) is illustrated for the first time to make comparison with the new species. An identification key and a distribution map of those Rhagonycha species with yellowish elytra from southeast China are present.
Lin Hanqing,Liu Haoyu,Yang Xing-ke,Yang Yuxia 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.2
The genus Trypherus LeConte, 1851 has dozens of species distributed in East Asia, but a few known in the mainland of China. In the present study, a large series of Chinese Trypherus material available allows us to make a taxonomic study. As a result, T. nankineus var. obscurimembris Pic, 1933 is removed from synonym of T. nan kineus Pic, 1913 and reinstated as a valid species, T. obscurimembris Pic, 1933 stat. nov. Meanwhile, T. plagiocephalus Brancucci, 1983 is supplementarily described and illustrated to better understand its variation in structures of the aedeagus. Additionally, a new species is discovered and described under the name of T. sinensis sp. nov. (China: Fujian). They are illustrated with habitus and genital segments of both sexes, aedeagus and internal genitalia of females. Besides, the generic diagnosis is resummarized and an identification key to all Trypherus species of the world is updated.
Weiwei Su,Zongping Chen,Haoyu Liao,Dingyuan Liu,Xingyu Zhou Techno-Press 2023 Advances in concrete construction Vol.16 No.3
In this study, the steel fiber and the polypropylene fiber were used to enhance the mechanical properties of fully recycled coarse aggregate concrete. Natural crushed stone was replaced with recycled coarse aggregate at 100% by volume. The steel fiber and polypropylene fiber were used as additive material by incorporating into the mixture. In this test two parameters were considered: (a) steel fiber volume ratio (i.e., 0%, 1%, 1.5%, 2%), (b) polypropylene fiber volume ratio (i.e., 0%, 0.1%, 0.15%, 0.2%). The results showed that compared with no fiber, the integrity of cubes or cylinders mixed with fibers after failure was better. When the volume ratio of steel fiber was 1~2%, the width of mid-span crack after flexural failure was 5~8 mm. In addition, when the volume ratio of polypropylene fiber was 0.15%, with the increase of steel fiber content, the static elastic modulus and toughness of axial compression first increased and then decreased, and the flexural strength increased, with a range of 6.5%~20.3%. Besides, when the volume ratio of steel fiber was 1.5%, with the increase of polypropylene fiber content, the static elastic modulus decreased, with a range of 7.0%~10.5%. The ratio of axial compression toughness first increased and then decreased, with a range of 2.2%~8.7%. The flexural strength decreased, with a range of 2.7%~12.6%. On the other hand, the calculation formula of static elastic modulus and cube compressive strength of fully recycled coarse aggregate with steel-polypropylene fiber was fitted, and the optimal fiber content within the scope of the test were put forward.
Yang Tang,Jie Wu,Xiang Liu,Xin Yang,Yuan Wang,Haoyu Xiong 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
In order to realize the precise positioning of the tools in the pipeline repair operation, solve the problems of the traditional throttle speed control, such as slow response, long deceleration distance and so on, this paper explores a deceleration process of a pipeline intelligent plugging robot (PIPR) that relies on the friction between slips and the pipe, and establishes its dynamic model based on fuzzy PID force servo control. The influence of PIPR initial velocity, expected deceleration distance, accumulator setting on the response time, positioning accuracy, overshoot and stability during deceleration is analyzed, and the results show that: as the initial velocity increases, the time for slips to contact the pipe decreases, the overshoot of the centroid acceleration gradually increases, the maximum overshoot is -3.4 m/s 2 , the control time of the deceleration process is within 30 s, the positioning accuracy is within 5 %; the expected deceleration distance has a greater impact on the positioning accuracy of the system than the initial velocity; and the accumulator setting has little effect on the positioning accuracy and stability of the system. These studies provide guidance for the design of pipeline robot speed control and positioning system.