bluuebunny/crossref_metadata_2025_split huggingface dataset:
Eye Tracker Evaluation on Google Classroom Using USE Questionnaire
Authors: Prabaswari Atyanti Dyah , Utomo Bagus Wahyu , Purnomo Hari 
Published: February 2021

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.