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.

중국 인터넷예약 차량 서비스와 승객 안전에 관한 실증 분석

Zihan Jiang(Zihan Jiang),이재은(Jea Eun Lee) 충북대학교 국가위기관리연구소 2020 위기관리연구논총 Vol.4 No.1

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>

Reforming the WTO Dispute Settlement Mechanism: Towards a Mega-Multilateral Court?

Zihan Liu 이준국제법연구원 2021 China and WTO Review Vol.7 No.1

Student

Zihan Shi 한국콘텐츠학회 2016 ICCC International Digital Design Invitation Exhib Vol.2016 No.-

Distributed Adaptive Bipartite Containment Control of Linear Multi-agent Systems with Structurally Balanced Graph

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.

Influences of weaving architectures and impact locations on the ballistic resistance of UHMWPE fabric

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.

Redeposition mechanism on silicon oxide layers during selective etching process in 3D NAND manufacture

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.

山东省临沂市农业劳动力老龄化对生产效率的影响研究

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.

Asymmetric Supercapacitors Based on Co₃O₄@MnO₂@PPy Porous Pattern Core-Shell Structure Cathode Materials

Wang, Zihan,Pan, Shuang,Wang, Bing,Qi, Jingang,Tang, Lidan,Liu, Liang The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3

In recent years, supercapacitors have been developed rapidly as a rechargeable energy storage device. And the performance of supercapacitors is depending on electrode materials, the preparation method and performance of electrode materials have become the primary goal of scientific development. This study synthesizes Co₃O₄@MnO₂@PPy cathode material with porous pattern core-shell structure by hydrothermal method and electrodeposition. The result samples are characterized by X-ray diffraction transmission/scanning electron microscope, and X-ray photoelectron spectroscopy. Electrochemical evaluation reveals that electrochemical performance is significantly enhanced by PPy depositing. The specific capacitance of Co₃O₄@MnO₂@PPy is 977 F g^-1 at 1 A g^-1, the capacitance retention rate of 105%. Furthermore, the electrochemical performance of Co₃O₄@MnO₂@PPy//AC asymmetric supercapacitor assembles with AC as the negative electrode material is significantly better than that of MnO₂//AC and Co₃O₄@MnO₂//AC. The capacity of Co₃O₄@MnO₂@PPy//AC is 102.78 F g^-1. The capacity retention rate is still 120% for 5000 charge-discharge cycles.