bluuebunny/crossref_metadata_2025 huggingface dataset:
Effectiveness of Puppet Media in Improving Speaking Skills of Elementary School Students
Authors: Saputra D S , Yuliati Y , Febriyanto B
Published: February 2021

This research is motivated by the low level of speaking skills of third grade elementary school students. This study aims to improve speaking skills in class III Burujul Kulon III Elementary School using puppet media. The research method used by researchers is classroom action research, with a total of 23 students. This research took place in 3 cycles, each cycle consisting of 3 actions. The techniques used in data collection are observation, tests, interviews, documentation, and field notes. The results showed that the use of media puppet could improve speaking skills in class III Burujul Kulon III Elementary School. This can be seen from the increase in the percentage of mastery learning in each cycle. Mastery learning in cycle I was 35.34%, Cycle II was 55.68 and cycle III was 78.85%.
The Use of Microsoft Mathematics Program toward Students’ Learning Achievement
Authors: Mayasari N , Hasanudin C , Fitrianingsih A , Jayanti R , Setyorini N , Kurniawan P Y , Nurpratiwiningsih L
Published: February 2021

The aim of this study was to investigate the students’ learning achievement by using Microsoft Mathematics media in the course of Matematika Sekolah II. The research design was quasi experimental with posttest only control design. The population in this study were all of first year students in the Mathematics Department of IKIP PGRI Bojonegoro. The sampling techniques was saturated sampling. The data was collected by using test. The technique in analysing data was using t-test with a significance level of 5%. The results of this study revealed that tcount > ttable was 3.156 > 1.71 so that H0 was rejected. It showed that the first year students’ learning achievements that was taught using Microsoft Mathematics media in the course of Matematika Sekolah II were higher than those who taught without it.
Virtual Mandarin Learning Tools for Interactive Online Learning
Authors: Sofi  , Ying Y
Published: February 2021

Millennials like to study in groups and utilize technology in learning activities. They also like experimental learning and learning methods of “learning by doing”. They can do many things at one time. This generation needs clear objectives at the beginning of their lessons and quick feedback on their curiosity. Most Mandarin literature students are from the millennial generation. For a more effective and efficient teaching and learning process, it is necessary to know the current learning styles of Mandarin Literature students. This study has three objectives as follows; First, to map the learning styles of Millennials generation who are also students of Mandarin Literature. Second, to map out the strategies needed to improve learning achievement. Third, to design tools that can improve learning achievement. The research method was carried out by distributing questionnaires to Mandarin literature students. From the results of the questionnaire, the researcher mapped the learning styles of these millennials. After that, researchers would create a learning tools that allows students to online learning independently.
The Relationship Between Limb Muscle Power and Balance With “Yeop Chagi” Kick Technique on Taekwondo on The Members of Gunung Karang Taekwondo Club (GKTC) 1995, Pandeglang Regency
Authors: Aryadi Dedi , Sudirman Ridwan , Ridwan Mukhtar , Suharto Taufik Hidayat , Rahmat Ayi , Assayid Wandi Suwandi
Published: February 2021

Limb muscle power and balance are one of the important elements of yeop chagi kick technique. This research aims to determine the relationship between limb muscle power and balance of the yeoop chagi kick technique on taekwondo athlete at Pandeglang Regency. This is done for the trainers, so they can apply a more concentrated physical exercise on the supporting factor of yeop chagi kick technique. This research used survey method with test and measurement technique. The subject was taekwondo athletes of Pandeglang Regency. The total samples taken were 20 people, the research used both vertical jump and strock stand instruments. Based on the research result, we obtained the correlation data between limb muscle power by yeop chagi kick technique of 0.680 including in the strong category. The correlation of balance by yeop chagi kick technique of 0.738 that including in the strong category. The correlation between limb muscle power and yeop chagi kick technique of 0.760 including in the strong category. The conclusion of the research is there is a relationship between limb muscle power and yeop chagi kick technique on the member of Gunung Karang Taekwondo Club (GKTC) 1995, Pandeglang Regency.
The Relevance of Reading Teaching Material Using New Technology
Authors: Sutini Cucu , Emzir  , Rasyid Yumna
Published: February 2021

This research was conducted to find a clear picture of typical reading teaching materials and to find out what principles are in determining teaching material, and in what form teaching material is manifested. In the process of making teaching materials very much related to several principles, among others; the principle of response, cohesion and stability. affective curriculum must be responsive to the needs of stakeholders, market needs, and ongoing research. Cohesion shows that teaching is made according to what has been learned and what will be learned by students. And stability is a technique of testing teaching material in the language learning process. Based on expert opinion that the embodiment of teaching material is print and electronic media. the use of electronic media has advantages. In accordance with the description above that learning by e-learning can use teaching materials / materials independently, can determine learning schedules, can increase active student participation, can improve the quality of learning materials and exercises. In the end, in determining the relevant teaching material has to do with several principles, among others; the principle of response, cohesion and stability. In the realization of this teaching material can be through print media such as books, and through electronic media such as; Computer Based Training (CBT), Web Based Training (WBT), Internet (Interconnection Networking), etc.
The Relationship between Strategic Agility and Resource Base View of the Firm Performance in Manufacturing Industry: The Research Framework
Authors: Nurjaman R , Rahayu A , Wibowo L A , Widjajani  , Mujiarto
Published: February 2021

Competition in various companies encourages practitioners, entrepreneurs and academics to examine the dynamic of business strategy. The spirited study of this business strategy was driven by its forceful environment. Dynamic moving environments require each company to be adaptive as quickly as possible. This adaptation encourages the company to have a certain advantage in facing competition. The winners of the market make the company can demonstrate a fast, flexible response, effective coordination and understanding of internal and external competencies. Similarly, in the manufacturing industry, the dynamic lifestyle of consumers encourages the company to adapt to creating its own excellence. The purpose of this article propose a research framework of the relationship between strategic agility and resource base view to the firm performance of manufacturing industry.
Navigation Lamp Model on Maritime Vocational Education Integrated With STEM Approach: Analysis and Design
Authors: Mustain I. , Abdurohman  , Iskandar E. , Nuryaman D.
Published: February 2021

The application of knowledge to practical in engineering maritime of vocational education for professional practice. Engineer faced the problems are intimately tied up with design. The aim of this research is develop navigation lamp model on the ship with STEM approach by engineer cadets. The research method was used analysis study and design for cadets applied in practice before on shipboard. Navigation lamp model built consist of anchor light, masthead light, towing light, and side light. Analysis of navigation light base on rules of COLREGs about light and shapes. Navigation lamp built as miniature model with source of energy from solar cell 50 WP and the electric usage controller added for charge and load of the lamp. Both charge and load are measured with digital volt/ampere meter. We obtained for the conclusion that engineering cadets understand of rules of COLOREGs about light and shapes which can built from miniature models with PV solar cell as source energy.
Hotel Wastewater Treatment by Integrating Mixing and Electrocoagulation Process
Authors: Nugroho F.A. , Lestari S.K. , Pebriani W. , Aryanti P.T.P.
Published: February 2021

Hotels used a considerable amount of water and chemicals for guest rooms, pools, landscaping, laundry, gardening, and other activities, depending on hotel categories. In this research, the liquid waste of the hotel was treated by a combination of mixing and electrocoagulation process to produce clean water, which was safely discharged into the environment. The EC reactor was equipped with 6 (six) Al electrodes as baffles with a current strength of 12 Aand operated in a continuous process. The agitation rate of turbine impeller was fixed at 100 rpm, while the influent flow rate into the EC reactor was maintained at 200 mL/min. The influences of differences in electrode configurations (i.e., 3 Anodes 3 Cathodes and 4 Anodes 2 Cathodes) on pH, turbidity, and BOD of the effluent were studied. Based on the experimental results, the Al electrode configuration of 4 Anodes 2 Cathodes showed better results than 3 Anodes 3 Cathodes. The decrease in BOD and turbidity were 84% and 93%, respectively. This technology can be considered as a promising green technologyto treat various industrial wastewater as well as reduce the raw water pollution by the industrial waste.
Simulation of Mixing Synthetic with hydrocarbons Refrigerant to Reduce the Value of Global Warming Potential with Refprop Software
Authors: Widodo  , Berkah Fajar TK , Tony Suryo MSK , Winoto SH
Published: February 2021

The problem of global warming or called GWP (Global Warming Potential) that occurs in the earth’s atmosphere, one of which comes from synthetic refrigerants used in household air-conditioning refrigeration machines. R410A is a refrigerant that still contains GWP: 1942. Hydrocarbon refrigerant is a refrigerant that does not contain ODP (Ozone Depleting Potential) and a very small GWP. By using ref prop software, the mixing process can be simulated to obtain refrigerants that have characteristics similar to R410A. Mixing using R32 / R290 ingredients varied with percentage compositions ranging from 50/50, 40/60, 30/70, 20/80, and 10/90. From the simulation results, a mixture approaching R410A with 10/90 composition with COP: 3.85 for R410A and 5.76 for 10/90 mixture was obtained. Compression ratio: R410A: 2.8 and for mixed refrigerants 10/90: 1.8. The refrigerant effect of mixed refrigerants is 10/90: 264,13, R410A: 161,68. By using this refrigerant mixture can reduce the GWP and improve the performance of the Air Conditioning cooling system so that it has a reduced GWP value that can be obtained significantly and has a large enough potential to replace the R410A.
Calculation and Analysis of Overall Equipment Effektiveness (OEE) Method and Six Big Losses toward the Production of Corter Manchines in Oni Jaya Motor
Authors: Setyawan Widy , Sutoni Akhmad , Munandar Taufik , Mujiarto
Published: February 2021

One of the factors that influence the smoothness in the Production Process is the condition of the equipment or machine. Frequent jams or even the engine may stop suddenly making the readiness and reliability of the machine is not optimal, causing production losses and quality degradation. For this reason, engine maintenance becomes a very important thing to consider in order to maintain the ongoing level of productivity. Oni Jaya Motor is a company engaged in manufacturing that produces motorcycle spare parts. This company is inseparable from problems related to the effectiveness of equipment or machinery. One of the causes of disruption to the production process is due to the lack of maintenance management on the machine. To overcome this, one of the methods used to measure engine effectiveness is the Overall Equipment Effectiveness (OEE) method. Where is known the value of OEE can provide information in evaluating maintenance activities so as to minimize the occurrence of lost production and decreased quality. The results of calculations with the OEE method on Oni Jaya motorcycles are carried out on the Corter Machine and take place from January 2018 to December 2018 with the highest OEE value of 81.0%, while the lowest OEE value of 77.1%. Based on the results of data processing and identification of the six big losses, the most influential losses on the machine are set up and adjustment of 29.8%, Reduced Speed Loss of 25.6% and Breakdown Loss of 21.3%.
Alternative Management of Traffic Accidents with Road Geometric Repair
Authors: Al Fauzi Fatchur Rochman
Published: February 2021

Severe accidents on the Gekbrong - Bangbayang road, Cianjur, very often occur and recur with the same pattern of events, which caused quite a lot of victims, in the form of property and lives. Handling of Field existing in n the form of making the ramp on the left side of the road, intended to halt vehicles that have failed brakes. This handling is certainly not rooted in the main problem, namely the steep geometric conditions of the road. Based on the data, the accident occurred on a vehicle that descended towards Cianjur. Failed brakes on vehicles that crashed on this road due to steep long descent. This geometric condition causes the driver - which is not normal through this section - to do continuous braking, which causes the brake lining to run out or the hydraulic brake system to be damaged, which in turn results in a severe accident. This situation can be avoided by improving the geometric conditions of the steep road, by changing the road alignment for vehicles going down towards Cianjur. Road alignment deflected in Gekbrong (KM 78 + 000) to the left, customized topographic data were made 2-3 bends, and end it merged back into the main line in Bangbayang (KM 74 + 000). While vehicles that ride towards Sukabumi continue to use existing roads with some geometric improvements, unless heavy vehicles are prepared for special lanes following the new road alignment.
A Design for Self Balancing Scale Model Bicycle
Authors: Abdurrahman Umar Tsani , Sukamto Pria , Sobarnas Mohamad Anas , Mujiarto
Published: February 2021

This research will describe the development of a self-balancing scale model bicycle. The main reason for just using a scale model instead of a full-size bicycle is to reduce development costs while maintaining the same design principle and software coding. For the hardware we are using a 1:10 metal bicycle model, Arduino Uno board for real-time balance control, GY-521 & MPU 6050 for real-time gyro and 3 axis accelerometers, and servo motor for weight balancing movement. 5-volt Li-ion battery power bank used for a power source. For coding, we use Arduino IDE for windows.
Eye Tracker Evaluation on Google Classroom Using USE Questionnaire
Authors: Prabaswari Atyanti Dyah , Utomo Bagus Wahyu , Purnomo Hari
Published: February 2021

Eye tracking is an activity of measuring focus or movement of eyesight in viewing web pages. Usability test methods using eye tracker can maximizing usability evaluations. Based on a discussion with eye tracker users that the usage of tools can make discomfort. We need an analysis of the use of eye trackers whether it affects the usability results. Especially the price of the tool is quite expensive. 16 respondents divided by 2 groups, doing the task with the eye tracker and without eye tracker. Then calculate the time for each task, and spread USE questionnaires. The average time of without eye tracker respondents in task 1 = 165 seconds, task 2 = 109.375 seconds and 3 errors occurred in task 2. The average time of respondents using eye tracker on task 1 = 164.75 seconds, task 2 = 83.442 seconds and 1 error occurred in task 2.There is no difference in the data of duration task completion time. There is a difference in the USE questionnaire satisfaction data between those who use eye trackers and without eye trackers for all elements. The level of website user satisfaction witheye tracker is lower than users without eye tracker.
Business process improvement in brown sugar industry in Kudus regency
Authors: Mu’adzah  , Immawan Taufiq
Published: February 2021

Kudus is a regency which belongs to one of the largest sugar cane farming and brown sugar producer in Indonesia. However, the challenges in sugar cane industry have been so tough lately. The consumption of sugar cane has increased, but the production process takes so long time. Regarding to this condition, it is difficult to compete with other sugar industries in national level, especially refined sugar. This research aimed to help the workers to make brown sugar industry in Kudus become a highly competitive industry, by improving the brown sugar quality, improving the production efficiency so it no longer takes much time, and improving the cost efficiency in order to reduce the production cost. The method implemented in this research was Business Process Improvement (BPI) by using Value Stream Mapping (VSM) as the activity map, based on the added value, Economic Value Added (EVA), and Key Performance Indicator (KPI) as the performance assessment indicators. The research findings revealed that there were two activities that had no added value, such as loading and delivering the sugar cane to the warehouse, cost efficiency, and production efficiency. The Economic Value Added was as much as Rp 256.702.5000 before the production, and increased by Rp 1.367.374.835 after the repairment, as many as five times. The production result had increased from 7 quintal to 8 quintal per day. Meanwhile, the use of chemical substance was decreased from 1 kilogram per day to 0, while the production cost was from Rp 4.937 to Rp 4.324, and the selling price increased from Rp 7.000 to Rp 14.000 per kilo, based on the standard production or limitation that has been decided.
Fatigue Life Prediction of 180 Ton Lifting Spreader Construction Material ST43 Using S-N Curve
Authors: Dharmanto Asep , Saepudin Asep
Published: February 2021

Lifting spreader construction with a maximum capability of 180 tons every day works by carrying transformer loads that vary up to maximum loads. The loads tested were 105 tons, 125 tons, 150 tons and 180 tonsThe tool not only experiences vertical tensile load but also experiences horizontal load due to acceleration or deceleration of the overhead crane. To prevent fracture due to fatigue, the lifting spreader needs to be analyzed its service life. Obtained data of mass transformers per year and construction specification will be dynamically analyzed using SAP2000 software to gain informationmaximum and minimum stress from each of its shell nodes. Data Collectionof stress will be processed through the S-N Curve mechanism and Palmsgren Miner rules to determine the cyclic load of the fatigue life plate of spreader. This analysis found that maximum capacity 180 tons value Sf above from endurance limit state. And the assessmentdecline fatigue life of the lifting spreader based data within 45 years. The researcher recommends a decrease in the value of the capacity till to 10 percent for things that are not expected that result in a decrease in the quality of construction.
Policy Analysis on Spare Part Inventory of Critical Asset with Life Cycle Cost Approach
Authors: Cahyo Winda Nur , Raben Riza S.I. , Prawahandaru Haryo , Swasono Bayu A. , Sutartono Riyan Tri , Immawan Taufiq
Published: February 2021

Life Cycle Cost (LCC) is a method which is used to calculate all costs over the use’s period that can be seen from the economic aspect to determine the alternative design. This method is also used to help for making a decision. The purpose of this research is to design a strategy to assist companies for making decisions in purchasing and inventory of critical parts engine based on the lowest cost. The result of this research is the company’s current strategy of breakdown maintenance costs Rp. 508,574,008.40 for one year of production. Meanwhile the results of the proposal strategy are preventive maintenance with Monte Carlo simulation tool to predict the amount of parts and when the inventory parts of the engine need to be replaced. The proposal strategy costs Rp. 786,968,691.40 for three years of production. So, it can be concluded that by using LCC calculation with Monte Carlo simulation tool, it can help the decision maker to determine the minimum cost in long term period.
The Planning Of Temperature Monitoring System, and Humidity On Supply Chain potatos industry based on Web
Authors: Aman S , Intakoris S , Wijayanti M , Firmansyah N A
Published: February 2021

The advancement of technology, facilitate businessmen in applying technological advances in overcoming problems. One of the them is the existance of a price war due to the abundance of crops’ harvest such as potatoes, chili, onion, and fruits, in particular area. Thus, causing prices to fall dramatically. Even, the farmer cannot sell their harvest product. The aim of this study was to create Planning Temperature Monitoring System and Humidity in the supply chain potatos indutry through online system based on web(website). Supervision of this will result in the value of temperature and humidity on each individual warehouse cold storage that will be sent through the web. Therefore, a plan for monitoring temperature and humidity in the warehouse potatos industry, designing performance of the system, analyzing their application on the web was made. The analog data is received by the receiver and read by Visual Basic 6.0 software to be translated into temperature values and humidity, then it is informed in real time. The result of this study is providing planning monitoring system where the harvest can be stored. As a result, when prices rise, the stored products in cold storage warehouses can be sold.
Quality of service evaluation based on importance performance analysis method and the kano model
Authors: Dewi SK , Nugraha A
Published: February 2021

The purpose of the research is to examine the perception of customer service. Importance Performance Analysis (IPA) used to determine the relationship between importance and quality performance of attributes. The Kano Model is trying to classify groups of attributes. The goal of combining these approaches is to recognize that service attributes that need to increase customer satisfaction and retain characteristics to maintain customer satisfaction. This research uses the service quality aspect of Gronross as defined in 23 service attributes. The study was carried out in restaurants with 23 customer service characteristics assessed by customers. The integration of the two methods resulted in fourteen service attributes which had to be improved.
Enhancing Food Security throughout Aquaponicsin Urban Farming Development Strategy
Authors: Sundari Ristina Siti , Arshad Adnan , Sulistyowati Lies , Noor Trisna Insan , Setiawan Iwan
Published: February 2021

Less waste in the activity of the aquaponics system implemented most as an innovative hobby that have given another benefit such as food security and sovereignty achievement at least by themselves, in addition to economically and health of the family in the household as well. This research aimed to know food security created by aquaponics in urban agriculture development strategy. The research methodused SWOT and IE Matric Analysis. The result showed that there are some priority strategies such as upgrade any skill and knowledge deal with aquaponics, socialize system benefit, increase aquaponics yield consumption and consumer expendable, implement the food health by aquaponics system, upgrade smart agribusiness capacity to enhance distribution access, and procure lower start-up cost.
An optimization design method for aerodynamic configuration of high aspect ratio wing
Authors: Zong Ning , Sun Jing , Dong Meijuan
Published: February 2021

The aerodynamic shape optimization design of the aircraft is to combine the aerodynamic performance analysis of the aircraft with the optimization method, by constantly changing the design shape of the aircraft, its aerodynamic performance is improved to achieve optimal aerodynamic performance under certain constraints. Aircraft aerodynamic shape optimization is a comprehensive design platform that integrates geometric parameterization, moving grid, CFD calculation and optimization algorithms. With the development of computational fluid dynamics (CFD) and the maturity of calculation methods, the role of aerodynamic shape optimization in modern aircraft design becomes more and more important. To this end, an aerodynamic shape optimization design platform based on non-uniform rational B-spline (NURBS) was established. In the optimization process, a mesh deformation method based on radial basis functions is used, and an arbitrary Lagrangian Eulerian method (ALE) is used to describe the unsteady process of the wing. The optimization analysis of the large aspect ratio wing under subsonic conditions has certain reference value for the deformation problem in the aerodynamic shape optimization design.
Design of general aviation airspace planning and management system based on Google Earth
Authors: Mou Jing
Published: February 2021

By studying the classification and use characteristics of navigable airspace, studying the methods and standards of all kinds of navigable airspace planning, determining all kinds of key parameters of navigable airspace, constructing the navigable airspace planning and management system based on Ge, providing corresponding technical reference and effective management means for the planning of navigable airspace, and solving the problems of airspace planning, efficient use of airspace and low altitude supervision Question.
Study on the reliability evaluation method for sun-synchronous orbit satellite power subsystem
Authors: Zhang Haiwei , Li Yong , Ren Denggao , Du Dongmei , Liu Chenhu
Published: February 2021

As an important component to provide satellite energy, the power subsystem in-service operation state is of great significance to satellite safety. In this paper, the power subsystem reliability evaluation is carried out on the basis of the actual telemetry data from satellites. Firstly, the influence factors of the power subsystem telemetry data are analyzed, and the modified method to calculate the output parameters is established; Furthermore, the degradation trajectory of the power subsystem output power is analyzed under different in-service time, and then the difference between the global and the local degradation is discussed. Finally, using the performance degradation model, the reliability evaluation method for the power subsystem is set up. The result shows that the local degradation trajectory in the end of lifetime is critical for the remaining useful life prediction, and the method can provide references for the in-service reliability analysis of the on-orbit satellites.
Vibration responses of a satellite subjected to acoustic excitation at launch stage
Authors: Zhang Jie , Xie Weihua , Yin Jiacong , Huiliang liu , Zhou Jiang
Published: February 2021

Acoustic-vibration prediction at early stage of satellite development can contribute to their structural and layout design. In this paper, numerical models of a practical satellite subjected to acoustic excitation at launch stage were established. Then, the effect of acoustic condition was further analyzed. The results demonstrate that it is difficult to predict all-frequency-band acoustic response of complex satellites by an individual method, so a combined method was proposed in this paper. The damping loss factor model of panels with equipment was introduced to resolve the issue of on-board equipment modelling in the statistical energy analysis model. The service modules are extremely sensitive to acoustic excitation of about 354∼2828Hz, which should be highlighted when carrying a rocket with a high sound pressure level at this frequency band.
Research on moon surface positioning and navigation method based on stellar vector measurement
Authors: Yuan Gao , Xunjiang Zheng , Xiaonan Mao , Huan Tian , Shuodong Sun
Published: February 2021

In response to the needs of positioning and navigation in lunar exploration projects such as manned landing on the moon, and the initial positioning of the lunar lander, this paper proposes a lunar positioning and navigation method based on stellar vector measurement and inclination information fusion, and demonstrates the correctness of the algorithm. A semi-physical simulation platform was built and the experimental method verified that the accuracy reached the positioning accuracy index of 30 arc seconds. Lunar surface positioning is different from ground positioning and cannot be positioned by satellites. This method solves the problems of low timeliness and low accuracy of ground measurement and control methods, greatly improving the timeliness and accuracy of lunar surface positioning, and has positive significance for lunar exploration projects.
A Review of Impact Tests of Light and Small UAV
Authors: Yongjie Zhang , Zhiwen Li , Yingjie Huang , Kang Cao , Yafeng Wang , Yazhou Guo , Jizhen Wang , Xiaochuan Liu
Published: February 2021

Unmanned Aerial Vehicles are widely used in aerial photography, exploration, logistics and other fields for their low cost, low take-off and landing requirements and many other advantages. With the deep application of UAVs, their safety problems have become increasingly prominent. The frequent occurrences of collision events have attracted the public attention. This paper reviews the UAVs weight threshold estimation test, UAVs impact aircraft windshield test and aircraft horizontal stabilizer test, and compares the results with bird collision results, discusses the impact safety challenges of light and small UAVs. This paper puts forward what should focus on about UAVs designing.
UAV inlet plasma stealth performance numerical simulation
Authors: Tianqi Zhang , Lv Weimin , Li Gen , Chenxuan Li , Liu Zhenyu , Yongqiang Li
Published: February 2021

Plasma stealth is a new concept and principle of stealth technology. Firstly, WKB analysis method is used to analyse the attenuation of electromagnetic wave under the action of plasma. Then, a certain UAV inlet was selected to establish a model, and the inner wall was covered with a ring of closed cavity. Plasma was generated by discharge, and the stealth performance of the inlet was numerically simulated for the L-band electromagnetic wave and its stealth effect was analyzed. This method verifies the feasibility of applying plasma stealth technology to the l-band radar wave for inlet stealth.
Compound control method for Anti-Unmanned Aerial Vehicle (UAV) vertical launch missile
Authors: Jiapan Chang , Yongshan Liu
Published: February 2021

A compound control method with aerodynamic canard and reaction jet is proposed for anti-Unmanned Aerial Vehicle (UAV) vertical launch missile. The purpose of this method is to solve the problem of vertical launch with high angle of attack and low dynamic pressure. This paper first introduces the actuator layout and ignition strategy of reaction jet. Then the model of compound control system is established and compared with aerodynamic control in detail. Simulation studies demonstrate the effectiveness of the proposed method.
Summary of the Test Methods for Icing Strength of Freshwater and Seawater
Authors: Zhang Yongjie , Zhang Yunhui , Renzhong Guo
Published: February 2021

Polar navigation ships, offshore platforms, and amphibious aircraft sometimes need to work in low temperature environments, which will inevitably form varying degrees of icing on the surface of structures such as cabin doors. In order to ensure their normal working conditions, it is advisable to choose reasonable anti-icing and deicing methods to prevent icing or effectively remove icing. Therefore, it is necessary to study the mechanical properties of ice to provide a reference for the selection of anti-deicing methods. This article summarizes the common methods for measuring the shear strength and tensile strength of ice, which can provide some guidance for the freezing strength test of fresh water and sea water.
Design of automatic system of lead sheet roll for fishing gear industry
Authors: Zeng Yangji , Cai Yong , Liu Zihong , Mao Sen , Xiao Jun
Published: February 2021

In this paper, we report an automatic system which combines machine design and machine vision to promote the automatic lead sheet roll production. In terms of the key problem identifying and locating millimetre-level slit in motion, the rotating module and the slit recognition module are designed based on the geometric characteristics of the lead sheet roll hub, and machine vision technology is used to extract the features of slit images. The automatic system enhances the production efficiency of lead sheet roll by nearly 8 times and lowers the production cost.
A Newly Constant-Thrust Control Method Based on Parameter Estimation
Authors: Zhang Yujin , Han Chao
Published: February 2021

Finite-thrust control technology is widely applied to space missions such as orbital transfer and rendezvous. However, traditional low-thrust method requires time-varying acceleration for achieving transfer and rendezvous. In this study, a newly piecewise constant thrust method is proposed for orbital transfer problems considering J
2 perturbation. To rapidly obtain the solution, UKF parameter estimation method is adopted, which transform the original problem into a parameter estimation problem. Numerical simulations are conducted to demonstrate the validation of the proposed method. It proves to be a practical choice for engineering applications.
A study on using cold forging process to manufacture bush
Authors: Premanond Varunee , Chumrum Pakorn
Published: February 2021

This work studied on the feasibility to produce agricultural bush parts using cold forging followed by machining to replace existing processes of piercing operation followed by shaving had been studied. Short tool life of the shaving punch is a major problem for existing processes. From this work, it was found that the maximum force required for cold forging operation is similar to that used on the existing process. Therefore same facility can be employed for a proposed method. A proper selection of billet size was necessary not only to obtain specific shape of final part, but also to yield maximum rate of material utilization. Another factor influencing the process was material flow constraint by cold forging die design. The design with highly constrained would lead to high stress introduced to the part. It is recommended to use forging die design with allow more of free material flow which is expected to improve tool life.
An approach to multi-satellite TT&C resource scheduling based on multi-agent technology and comprehensive weighted priority determination method
Authors: Li Changde , Xu Wei , Xu Liang , Wang Yan
Published: February 2021

The purpose of satellite tracking telemetry and control (TT&C) resource scheduling is to scientifically allocate limited ground TT&C resources, and to maximize the scheduled tasks of satellite TT&C through a certain scheduling method. Due to the sharp increase in satellite numbers, Traditional scheduling methods face challenges with more TT&C tasks, more resource competition and more emergencies. As the agent is independent, flexible, intelligent and distributed, we introduced agent technology to solve the problem. Combining characteristics of multi-satellite TT&C resource schedule with description method of attribute, interaction, rule and state on agent technology, we established four agent models: manager agent, station agent, equipment agent and task agent. Then, by analysing the requirements of satellite TT&C engineering, we proposed a comprehensive weighted priority determination method to determine TT&C resource allocation. Last, we simulated real application scenarios to validate this method. And it proves to be effective.
Design of quintuple band-notched UWB antenna with copper coin shaped structure
Authors: Zhang Hongjian , Cao Xia
Published: February 2021

A copper coin shaped quintuple band-notched UWB antenna with square hole is introduced in this paper. Based on the methods of loading parasitic elements and etching slots, the antenna obtains five band notched characteristics to suppress the interference from WiMAX(3.3-3.7GHz), INST (4.5-4.8 GHz), WLAN(5.15-5.825 GHz), X-band(7.25-7.75 GHz) and ITU band (8.01-8.5 GHz) in UWB communication systems by etching three types of curved slots and a split elliptical ring slot in the patch, and loading a pair of C shaped stubs near the feed line. The results show that the designed antenna operating from 2.53-10.58 GHz, is able to reject the frequency bands centred at 3.5 GHz, 4.5 GHz, 5.5 GHz, 7.6 GHz and 8.4 GHz. Meanwhile, it has relatively omnidirectional radiation patterns with a gain above 1.2 dBi in non-notch bands. The proposed antenna with size of 31*32mm2 is simple in structure, and it can meet the requirements of miniaturization and suppressing ot-her narrowband communication systems in UWB system.
Analysis of follower motion law and optimization of fitting function in reverse design of cam
Authors: Ji Zhaoping
Published: February 2021

Because of its compact structure and reliable performance, the cam mechanism has been widely used in automatic machinery, such as automatic tool changing system, packaging machinery, automatic production line, automatic switching system and so on. At present, a variety of common drive and control devices have been developed with arc cam as the core component. The cam indexing mechanism is a new type of transmission device to realize high speed and high precision intermittent indexing motion. It is widely used and has been studied by more and more scholars at home and abroad, and has achieved remarkable results. At present, its theoretical research has matured. However, because the profile of indexing cam is a non-spiral surface in space, it brings inconvenience to the design and manufacture of cam. When the arc cam is damaged and the design parameters of the original arc cam cannot be known, the original arc cam profile can only be obtained by measuring limited data. In the original parameterized design method, the profile of the arc cam is determined by the motion law of the follower. If the motion law curve of the follower can be obtained, the contour curve of the arc cam can be obtained in reverse. So the problem of solving the profile surface of the cam can be transformed into a follower which meets the requirements the curve of motion law. Taking the CAM Z175 as an example, this paper describes in detail the whole process of motion rule analysis, optimization of the motion law curve and simulation verification in CAM reverse design.
Design of non-magnetic temperature control system for atomic vapor cell of atomic magnetometer
Authors: Jin K , Hu H , Liang Z , Geng X X , Wu T Y , Qu J L , Tang W W , Wang M , Li G X , Liang S Q , Yang G Q , Huang G M
Published: February 2021

In order to make the atomic magnetometer work, the heater of the atomic vapor cell must ensure that the temperature can be accurately controlled and the magnetic noise should be reduced as much as possible. This work proposed a non-magnetic heater and designed a corresponding temperature control system. It shows that the heater structure has good heat preservation performance and so, control of the heating process is made easy. The test results indicate that the fluctuation range of vapor cell temperature is less than 0.018°C, 0.015°C and 0.006°C respectively at 40°C, 50°C and 60°C. The effect of heater on the magnetic field cannot be observed by fluxgate magnetometer HS-MS-FG3LN-100 (<300pT).
Degradation analysis and optimization of temperature effect on MEMRISTOR-based Neural Network Accelerators by electro-thermal simulation
Authors: Shang Mengjun , Yin Longxiang , Xu Ning
Published: February 2021

Nowadays, memristor-based neural network accelerators have been widely studied due to their outstanding performance in massive parallel vector matrix multiplication. However, the memristor is sensitive to temperature and its on/off state operation window can be seriously degraded by the increasing temperature, which may lead to computation failures in memristor -based NN accelerators. In this work, we establish an electro-thermal simulation platform to evaluate the temperature impact on memristor -based NN accelerators. With this platform, we first investigate the impact on computation accuracy with the temperature increase in different NN layers in the accelerators. We then apply a temperature-aware NN weight mapping scheme to the most temperature-sensitive layer and achieve 28.89% improvement in computation accuracy, which only has 0.06% difference with the improvement achieved by applied the mapping scheme to the whole NN model. This finding can help to simplify the temperature-aware hardware optimization design in memristor-based neural network accelerators and reduce the power consumption.
Analysis research of industry accident law based on barrier theory and text semantic recognition technology
Authors: Yan Hongqiao , Tian Kun , Fan Zhiqiang , Mao Yaming
Published: February 2021

One of the important reasons for the repeated occurrence of the same type of accidents in the group company over the years is the insufficient utilization of accident resources. This paper introduces barrier theory and establishes an accident analysis method system based on barrier theory. Barrier theory changes the traditional accident analysis mode, and adjusts the object of accident analysis from consequence to barrier, which provides a new perspective for the analysis of accident law. This paper develops a HSE text semantic recognition model which can automatically extract the production operation link, production stage and type of failed barriers of the accidents from the accident investigation report, finds out the cause factors leading to the failures of these barriers and establishes a direct relationship with the HSE(Health, Safety and Environment) management system, in a way to find out some common laws of the accidents and reveal the defects and shortcomings in business management.
The integrated application of computer software in architectural space design
Authors: Yin Le , Lu Zheng
Published: February 2021

The characteristic of computer software for drawing construction drawings, making 3D models and rendering space effects is to express design concepts intuitively. Through training and mastering computer software technology, architects can accurately describe the structural relationship, proportion relationship, shape color and material texture of buildings in the process of drawing. Through the design works of architect Sou Fujimoto, this paper visually observes the integrated application of computer software in architectural design.
A strongly secure PF-CL-AKA protocol with two-way ID-based authentication in advance for smart IoT devices
Authors: Zhang Zhishuo , Sun Yu , Zhang Wei , Wu Yi , Qin Zhiguang
Published: February 2021

With the rapid advancements of semiconductor technologies and wireless communication, Internet-of-Things (IoT) based network has a wider range adoption in the smart city. The Wireless Body Area Network (WBAN) is a representative IoT based network designed to connect various wearable IoT devices, located inside or outside of a human body. The WBAN typically connects itself to the mobile network and Internet via the smartphones. But how to mutually authenticate the entities’ identities and ensure the data confidentiality and integrity during the data transmission over a channel have still been the most prominent challenge in the IoT based networks. To solve the abovementioned challenge, in this paper, we propose a strongly secure pairing-free certificateless authenticated key agreement (PF-CL-AKA) protocol with two-way identity-based authentication before extracting the secure session key for the smartphones and wearable IoT devices. Our protocol is provably secure in the Lippold model, which means our protocol is still secure as long as each party of the channel has at least one uncompromised partial private term.
A Wavelength Selection Model Based on Successive Projections Algorithm for pH Detection of Water by VIS-NIR Spectroscopy
Authors: Li Lina , Guo Shangxing
Published: February 2021

A novel pH detection method using VIS-NIR (visible near infrared) spectroscopy for water is introduced in this paper. In order to improve prediction accuracy and calculation speed of pH detection using VIS-NIR spectroscopy, a wavelength selection model of SPA-MLR (successive projections algorithm and multiple linear regression) is proposed. Two experiments (pH measurement experiment by VIS-NIR spectrophotometer and pH measurement experiment by VIS-NIR grating spectrograph) are employed to evaluate the performance of SPA-MLR. At meanwhile, PLS (partial least squares), GA-PLS (genetic algorithm and partial least squares) are introduced to compare with SPA-MLR. The results indicate that, the prediction accuracy and calculation speed of SPA-MLR are all better than that of PLS and GA-PLS. Under the pH measurement experiment using VIS-NIR spectrophotometer, only one wavelength is selected from 351 original wavelengths for calibration, the RMSEP (root mean square errors of prediction) is 0.35, and the model training speed is 2.36s. Under the pH measurement experiment using VIS-NIR grating spectrograph, 3 wavelengths are selected from 2860 original wavelengths for calibration, the RMSEP is 0.50, and the model training speed is 56.45s. For the two experiments, the selected wavelength variables by SPA are distributed mainly in the band of 870 nm to 990 nm.
Research on UE4 - based Visualization Simulation of Underwater Vehicle Polar Region Sailing
Authors: Wang Luobin , Ge Jingyu , Li Pengcheng , Cheng Jianhua
Published: February 2021

With the continuous exploration of polar sea areas, the reliability and safety of polar navigation have become the top priority. Due to various influencing factors in the polar region, including sea ice, ocean currents, geomagnetism, gravity, etc., navigation equipment in the polar region cannot achieve the performance of the mid-low latitude region. Because of the limitation of the actual ship entering the polar region, the performance of navigation system in polar region cannot be fully verified. It is difficult to verify the performance of equipment on a real ship. In order to reduce the cost of the experiment while ensuring the accuracy of the verification and making the simulation training system available at the same time. Based on UE4(Unreal Engine4) to design a virtual 3D visual simulation platform of underwater vehicle that is able to simulate the six-degree-of-freedom(6-dof) motion of the underwater vehicle and verify the performance of navigation equipment in polar region. Verify the virtual simulation platform is able to simulate the movement of underwater vehicle in the virtual polar sea and realize the operation training simulation of underwater vehicle.
Simulation of Cooperative Positioning Flight Ad-hoc Network
Authors: He Chenglong , Yu Baoguo
Published: February 2021

Cooperative positioning method is necessary for multiple rotor-winged drone swarm applications for airborne satellite navigation receiver has less usability in urban canyon, which could be achieved by drones’ FANET (flight ad-hoc network): each drone broadcast and receive wireless signals containing measurement information with its neighbour drones, then calculate the relative position results or absolute results when some drone could positioning by satellite navigation receiver, to reduce the communication demand all drones distributed to multi-subnet dynamically. A simulation of the cooperative positioning process was shown, which achieves the continuous relative positioning result in denial environment.