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( Xiulin Qiu ),( Yongsheng Xie ),( Yinyin Wang ),( Lei Ye ),( Yuwang Yang ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.11
The utilization of UAVs in various fields has led to the development of flying ad hoc network (FANET) technology. In a network environment with highly dynamic topology and frequent link changes, the traditional routing technology of FANET cannot satisfy the new communication demands. Traditional routing algorithm, based on geographic location, can “fall” into a routing hole. In view of this problem, we propose a geolocation routing protocol based on multi-agent reinforcement learning, which decreases the packet loss rate and routing cost of the routing protocol. The protocol views each node as an intelligent agent and evaluates the value of its neighbor nodes through the local information. In the value function, nodes consider information such as link quality, residual energy and queue length, which reduces the possibility of a routing hole. The protocol uses global rewards to enable individual nodes to collaborate in transmitting data. The performance of the protocol is experimentally analyzed for UAVs under extreme conditions such as topology changes and energy constraints. Simulation results show that our proposed QLGR-S protocol has advantages in performance parameters such as throughput, end-to-end delay, and energy consumption compared with the traditional GPSR protocol. QLGR-S provides more reliable connectivity for UAV networking technology, safeguards the communication requirements between UAVs, and further promotes the development of UAV technology.
Microstructure Evolution and Erosion-Corrosion Resistance of Amorphous Ni-P Coatings
Xiulin Ji,Shuang Jiang,Hongbin Li,Chunyan Yan,Liangfeng Jiang 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
Amorphous Ni-P coatings with 7.8 wt% P were electrodeposited successfully from an electrolytic bath containing 15 g/L H3PO3. Its microstructure evolution by heat treatment and erosion-corrosion resistance are investigated in this paper. From room temperature to 500 °C, there were three exothermic crystalline phases of Ni5P2, Ni3P and Ni precipitated from the amorphous base. The microstructure evolution of the amorphous Ni-P deposits follows the sequence of amorphous, amorphous-noncrystalline, (Ni5P2 + Ni3P),then (Ni5P2 + Ni3P + Ni) with increasing heat treatment temperature. The mass loss rate of amorphous Ni-P coatings is approximately 14 mg/h and the synergism of erosion-corrosion was larger than half of the total mass loss at an impingement velocity of 8.37 m/s under saline-sand slurry. The erosion-corrosion resistance of amorphous Ni-P coatings can be enhanced obviously by heat treatment because of the elevated hardness and corrosion resistance.
Design of Tool Automatic Identification and Database Management System Based on RFID
Xiulin Sui,Yan Teng,YongQiu Chen,XueHui Wang 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.5
RFID (Radio Frequency Identification) is a non-contact automatic identification technology, without human intervention. It is convenient to apply and it can identify fast moving objects. Around the tool and the tool information, the problem of low operational efficiency and low degree of tool management information are still unsolved. In this paper, RFID technology is applied in the tool automatic identification and management system. The tool automatic identification and database management system based on RFID is built. The application model, tool information database design and Upper Computer management software of the RFID in tool identification and management are analyzed. The overall architecture and the software function module of the system are constructed. The database management system is developed by the LabVIEW software. The interface design between LabVIEW and Access database is completed by using ActiveX, as a result, the information of Access database can be written-in and read-out by the management system. Meanwhile, the communication protocol between the Upper Computer and Lower Computer is programed that based on VISA. The RS232 is applied to make the communication between the Upper Computer and Lower Computer come true. Finally, take the SECO's Solid Carbide Ball-end Milling Cutter as an example to have an experiment. Through the experiment, the system proved to be with high reliability and efficiency.
양수림 ( Xiulin Yang ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.4
본 연구는 중국인 학습자의 한국어 어휘 학습 전략 사용 양상에 대해 살펴보고 학습자의 한국어 성취도에 따라 차이가 있는지 검증하는 데 목적이 있다. 이를 위해 ‘중국인 학습자의 한국어 어휘 학습 전략 사용에 대한 설문지’를 개발하여 중국인 학습자 122명을 대상으로 설문조사를 실시하였고, 조사 결과는 SPSS 25.0을 이용하여 기술통계와 독립표본 t-test를 통해 분석하였다. 그 결과, 대부분의 전략 유형에서 평균 사용 빈도가 2~3점대로 학습자의 어휘 학습 전략 사용이 전체적으로 활발하지 않았고, 한국어 성취도별 전략 사용에서는 상위 집단이 전략을 더욱 활발히 사용하여 하위 집단과 14개의 세부 전략 사용에서 유의미한 차이를 보였다. 이러한 연구는 학습자의 성취도별 차이를 고려한 맞춤형 어휘 교육을 위해 기초 자료를 제공해 줄 수 있다는 데 의의가 있다. This study aims to examine the usage of Korean vocabulary learning strategies by Chinese learners and to verify whether they differ according to learners’ Korean language achievements. For this purpose, a survey was conducted with 122 Chinese learners after developing a questionnaire named “Questionnaire on the Use of Korean Vocabulary Learning Strategies for Chinese Learners.” The data were analyzed by descriptive statistics and independent samples t-test using SPSS 25.0. The results showed that the average frequency of use of most types of strategies is in the range of two-three points, learners’ use of vocabulary learning strategies is not active overall, and in the use of strategies according to Korean achievements, the upper group used strategies more actively and 14 strategies showed significant differences between the upper and lower groups. This study is meaningful in that it can provide basic data for customized vocabulary teaching considering the differences in learners’ achievements.