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中国侨乡留守儿童的关爱服务机制的个案研究 ―基于行动者网络理论的视角
李子涵 ( Li¸ Zi Han ),黄益品 ( Huang¸ Yi Pin ),金会洙 ( Kim¸ Hoi Soo ) 한국외국어대학교 중국연구소 2021 中國硏究 Vol.88 No.-
The establishment of social welfare policies for the care and protection of left-behind children has received attention from various countries, and it is an essential issue for the Chinese government and scholars to be set to offer the caring service for left-behind children according to local conditions. Actor Network Theory (ANT) is a sociological analysis method to study the interaction and formation of heterogeneous networks among actors. It presents the network construction process centred on this focal actor by following the operation of the focal actor. Through a case study of the hometown of overseas Chinese in Zhejiang Province, this paper finds that left-behind children's caring service mechanisms mainly include the focal actor, obligatory points of passage, and heterogeneous actors. These mechanisms mainly guide the expansion of the project through the focal actor, assign roles and responsibilities to actors according to the obligatory points of passage, dynamically recruit heterogeneous actors based on the benefits conferred, and actively mobilize actors to participate in the operation of the network for its sustainable development. In the operation of the caring service mechanisms for left-behind children in the hometown of overseas Chinese, first, it is necessary to establish the focal actor to offer both basic protection and precise caring service; second, it is necessary to build a reasonable obligatory point of passage to form a common vision for project development; third, it is necessary to deepen interessement, recruit multiple heterogeneous actors and mobilize their participation; fourth, it is necessary to ensure the efficient operation of the network to form the synergy of meticulous care.
Zihan Zhou,Yunwen Wu,Huiqin Ling,Jie Guo,Su Wang,Ming Li 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
3D NAND flash memory with vertically stacked cells has been developed to break through the limits oftechnology nodes. However, during the selective etching process, it is difficult to ensure the byproductsdiffuse away from the trenches in the multistacked layers. Once saturated, the byproduct causes abnormalredeposition on the SiO2 layers. This problem has restricted the development of high-density 3DNAND memory. To solve this problem, the composition and formation mechanism of the redepositedlayer must be clarified. In this study, a ternary-wafer system comprising a Si3N4/SiO2/Si3N4 stack was fabricatedto study the redeposition mechanism, and the morphology, elastic properties, and chemical compositionof the redeposited layer were clarified. The redeposited layer consists of spherical particles withelastic surfaces (average Young’s modulus of 24.17 GPa). The particles were confirmed to comprise colloidalsilica gel covered by silanols. By considering the chemistry of silica, the redeposition mechanismwas proposed as follows: colloidal silica gel is formed by the aggregation of silicic acids from Si3N4 etching,which adsorb onto the SiO2 layer through oxide bridges and hydrogen bonding. Our work will contributeto the development of high-density 3D NAND memory.
Zihan Zhu,Hu Zhou,Xiangshao Kong,Fang Liu,Yongqiang Zhang,Cheng Zheng,Weiguo Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
This study is devoted to reveal the influence of weaving architectures and impact locations on the ballistic resistance of UHMWPE (ultrahigh high molecular weight polyethylene) fabrics. Firstly, a mesoscopic model of UHMWPE fabric is established and the accuracy of the numerical method is verified. Subsequently, the models with different weaving architectures are further established, and the impact resistance performances are evaluated. Finally, the influence factors on the fabric ballistic resistance is explored. It is proved that the ballistic resistance of UHMWPE fabric mainly dominated by the tensile strength of yarn under highvelocity impact. The plain fabric shows best anti-ballistic performance, while basket and woven fabric are slightly inferior. The damage pattern of fabrics with different weaving architectures changes greatly. In addition, this study proposes a residual impact velocity correction model for projectile based on the probability distribution of impact positions, which can better characterize the protective ability of fiber fabrics.
Distributed Random Access Scheme for Collision Avoidance in Cellular Device-to-Device Communication
Zihan, Ewaldo,Kae Won Choi,Dong In Kim IEEE 2015 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.14 No.7
<P>In this paper, we propose a fully-distributed random access protocol for the device-to-device (D2D) communication in a cellular network. The D2D communication can provide a significant capacity gain by enabling a cellular network to offload data traffic to direct communication links between devices (i.e., D2D link). However, a D2D link can generate serious interference to other D2D links as well as cellular devices without any proper interference control mechanism. Compared to centralized resource allocation and power control schemes for the D2D communication, a distributed scheme is advantageous in that it has smaller control overhead and is more responsive to traffic demands. To protect a D2D receiver, the proposed scheme employs a collision avoidance mechanism that creates an exclusion region around the D2D receiver, where interferers are prohibited from transmitting a signal. We analyze the proposed scheme by assuming that the locations of devices follow a Poisson point process. By simulation, we show that the analysis results accurately match the simulation results and that the proposed scheme outperforms a distributed D2D scheme without collision avoidance by a very wide margin.</P>
Zihan Liu,Xisheng Zhan,Jie Wu,Tao Han,Huaicheng Yan 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.11
This study researches the bipartite containment control problem of heterogeneous linear multi-agent systems under a signed digraph. The bipartite containment problem can be viewed as the output regulation problem by devising a compensator. By distributing a coupling weight which is time-varying to each follower, the adaptive protocols are proposed. Thus, we propose the distributed dynamic state feedback and output feedback protocols in conjunction with adaptive control, by which followers will converge to the convex hull crossed by leaders. Additionally, based on the utilization of the Lyapunov function approach, some extensive criteria are deduced to guarantee the bipartite containment of heterogeneous multi-agent system. The final simulations demonstrate the viability of the theoretical results.
汲子涵(Zihan Jia) 동아시아무역학회 2020 Journal of East Asian Trade(JEAT) Vol.2 No.1
目前,山东省临沂市农业劳动力老龄化趋势逐渐突出,导致农业劳动力供给面临质量下降的危机,对农业生产效率产生一定影响。本文采用问卷调查的方式收集了山东省临沂市 2019 年 300 户农户的数据,阐述了临沂市农业老龄化劳动力的发展现状。利用柯布-道格拉斯生产函数建立回归方程,引入若干农业投入因素,探讨劳动力老龄化对农业生产效率的影响。结果表明,山东省临沂市农业生产劳动力老龄化较为明显,60 岁以上的农业劳动力占样本农户的 19.86%。对比老年农户和非老年农户的农业生产效率,发现老年农户的农业生产效率较低。一方面,老年农民基本生产要素投入的边际产值低于非老年农民;另一方面,土地面积等生产要素的投入数量也低于非老年农民,说明临沂市农业劳动力的老龄化严重阻碍了农业生产效率的提高 Purpose - The purpose of this paper in order to study the effect of aging of agricultural labor force on agricultural production efficiency in Linyi. Design/Methodology/Approach - The data of 300 rural households in Linyi city, Shandong province in 2019 were collected by questionnaires, and the development status of aging agricultural labor force in Linyi city was expounded. The regression equation was established by using cobb-douglas production function, and several agricultural input factors were introduced to explore the influence of aging labor force on agricultural production efficiency. Findings - The results showed that the aging of labor force in agricultural production in Linyi city, Shandong province was obvious, with agricultural labor force above 60 years old accounting for 19.86% of the sample farmers. Research Implications - In the management due to the limitations of reading materials and personal research experience, the research depth of this paper is insufficient.
Yuan Zihan,Zhao Haizhou,Zhi Qiaoming,Wang Sentai,Liu Chao,Han Ye,Xu Zhihua,Liu Fei,Liu Xingyi,Zan Xinquan,Wang Qiang,Wan Daiwei 한국유전학회 2022 Genes & Genomics Vol.44 No.12
Background: It has been well established that the long non-coding RNAs (lncRNAs) plays a critical role in tumor progression. However, the function of these transcripts and mechanisms responsible for their deregulation in colorectal cancer (CRC) remain to be investigated. Objective: To explore the potential effect and regulation mechanism of lncRNA H19X in colorectal cancer. Methods: We predicted and validated long non-coding RNA H19X from microarray data of colorectal cancer tissues. In addition, the biological behaviors of H19X and miR-503-5p on CRC were examined in vitro and in vivo, including MTT, colony formation assay, Hoechst33342 and transwell assay. The mRNA and protein levels of KN Motif and Ankyrin Repeat Domains 1 (KANK1) were analyzed by Quantitative real-time PCR (qRT-PCR), western blotting (WB) assay. Moreover, bioinformatics tools and dual-luciferase reporter assay were applied to demonstrate the relationship between KANK1 and miR-503-5p. Results: H19X was remarkably up-regulated in CRC tissues. Its expression related to tumor size (p = 0.041), lymph node metastasis (p = 0.037), distal metastasis (p = 0.028), advanced TNM stage (p = 0.034) and poor survival in CRC. H19X acted as an oncogenic lncRNA that induced CRC cell proliferation, invasion and metastasis. Through a number of functional studies, we found that H19X silencing inhibited the malignance phenotype of cancer cells through loss of miR-503-5p. Further studies demonstrated that miR-503-5p was involved in the progression of CRC by directly regulating the downstream target KANK1. Conclusion: Collectively, the findings of the present study indicate H19X/miR-503-5p/KANK1 axis has critical role in the progression of colorectal cancer, providing an effective prognostic indicator and promising target in treatment of colorectal cancer.