bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effectiveness e-authentic assessment in computer network course
Authors: Ambiyar  , Efendi Raimon , Irawati Yuyun , Waskito  , Suryadimal  
Published: May 2020

Abstract
This study aims to identify the quality and effectiveness of the application of authentic web-based assessments in computer network learning on wireless material, and to identify profiles of students’ skills and knowledge competencies in learning computer networks on wireless material. The trial was conducted at the Faculty of Computer Science, University of Dharmas Indonesia. This research uses a descriptive method. The population in this study were students of the Informatics Engineering Study Program. Sampling is done using the purposive sampling method. Based on the results of the study, the quality of authentic assessments showed validity for assessment of performance of 0.94 (high) and reliability of 0.93 (very high), while the validity for the description question was 0.97 (very high) and reliability was 0.98 (very high). Based on observations on the effectiveness of the implementation of authentic assessments and student questionnaires, the level of application of authentic assessments is in categories both at the stage of assessment preparation, implementation of assessment and reflection. The skills competency profile of most students is in very good category, while the knowledge competencies of most students fall into sufficient categories for each indicator of the problem.
Analysis of surrounding gas temperature influence on thermocouple measurement temperature
Authors: Liu Budong , Huang Qinhuang , Wang Peiyong 
Published: May 2020

Abstract
When thermocouple is used to measure high temperature gas flow, the measured temperature, i.e., the thermocouple bead temperature is not exactly the gas temperature. The bead temperature results from the bead energy balance including the convection with the gas flow, the radiation with the environment and the gas, the conduction with the thermocouple wire near the bead. The wire temperature is determined by its own energy balance relating to the gas temperature contacting the wire. Through the wire conduction, the bead temperature is related to the gas temperature around the wire near the bead. The one-dimensional thermocouple heat transfer simulation code was developed and validated by the elaborate experiment. In the current study, this code is used to study the influence of the surrounding gas temperature on the bead temperature. Of course, the gas temperature far away from the bead will not influence the bead temperature. The size of the surrounding region which could influence the bead temperature is identified and its relation with the flow condition and the thermocouple size is analyzed. The quantitative bead temperature variation with the temperature gradient inside this region is studied.
Accurate finite-volume high-order compact interpolation with non-orthogonal and non-uniform grids for computational aeroacoustics
Authors: Uehata Shogo , Yamasaki Nobuhiko 
Published: May 2020

Abstract
In recent years, with the development of supercomputers, the need for engineering applications of computational aeroacoustics is increasing. For industrial applications, the finite-volume compact interpolation is often applied as a discretization method. However, the original finite-volume compact interpolation can be applied only for calculation grids which are orthogonal and uniform, because the original finite-volume compact scheme is formulated assuming that calculation grids are orthogonal and uniform. Indeed, calculation grids for the computational aeroacoustics cannot be limited to orthogonal and uniform. Therefore, the finite-volume compact scheme for arbitrary calculation grids is required. In this paper, the finite-volume NOGS compact scheme is established in three dimensions to be suited for calculations using arbitrary grids. The interpolation error tests were conducted using a number of non-orthogonal and non-uniform grids to verify the NOGS compact scheme. From these interpolation tests, it is revealed that the NOGS compact scheme can reduce the interpolation error compared to the original compact scheme. Therefore, it is predicted that the reduction of the interpolation error leads to accurate evaluation of the numerical flux and that the calculation results are improved. Also, the large eddy simulations around a circular cylinder were conducted to verify the influence of the interpolation error reduction on the flow field and on the sound field.
Development of Hierarchical UAS Traffic Management (UTM) in Taiwan
Authors: Lin Chin E. , Shao P. C. 
Published: May 2020

Abstract
The unmanned aerial vehicles (UAVs) will soon be legally flying into airspace in Taiwan and many countries. UAS traffic management (UTM) becomes an important issue to challenge aviation safety. A hierarchical UTM is proposed and constructed based on the concept of Air Traffic Management (ATM) for the manned aviation system. The proposed Regional UTM (RUTM) and National UTM (NUTM) are hierarchical infrastructure to offers traffic management services for all legal UAV flights in Taipei Flight Information Region (TPE FIR) under and over 400 feet. The proposed UTM provides UAV/pilot log-in/out, flight planning, geo-fencing, detect and avoid (DAA), logbook records, big data analysis, ground control redundant support and controller-pilot communication on multi-window monitor system. UTM data are encrypted to prevent hijacking threat to low altitude UAVs. The UTM adopts ADS-B Like communication infrastructure to offer affordable cost for all UAVs with high reliable surveillance data reporting. The ADS-B Like surveillance mechanism includes 4G/LTE, LoRa, APRS and XBee. Their gateway deployment is designed and constructed with supports of Chung Hua Telecommunication (CHT) in urban and suburban areas. While those remote areas, such as mountain and deep forest, the National Forest Bureau workstation will be selected. The ADS-B Like communication will cover full airspace in Taiwan. Surveillance data reliability, continuity, integrity and availability will be examined by flight tests. The proposed Hierarchical UTM will launch trial runs in Tainan County of RUTM operation to verify the proposed concept, system performance and general operation into the national “UAS Innovative Experiment Project”.
A Study on Stacking Sequence Design of Composite Fan Blades Using Multi-level Optimization
Authors: Sung Y. J. , Jun Y. U. , Park J. S. 
Published: May 2020

Abstract
In this paper, the multi-level optimization method is proposed to design the optimal stacking sequence of composite fan blade more efficiently. The fan blade model used is a laminate with inconsistent stiffness because the thickness is not uniform throughout the model. This feature complicates the optimization problem and makes it difficult to apply optimal design algorithms that use only continuous or discrete variables. For this reason, we conducted the literature survey about combining the optimal design algorithm with continuous and discontinuous variables and developed optimization algorithm for the composite fan blade. Moreover, the design space of discrete variables is reduced through the optimal design of continuous variables. In the first-level, response surface method is used, with the design variables being the volume fraction of plies of the predefined angles of [0°/±45°/90°]. The optimization problem in the first-level aims at minimizing the tip displacement of the fan blade and constraints on other structural responses are imposed. At the second-level, the permutation genetic algorithm is used with the fiber orientation of each ply as design variables. In this level, we perform the optimal design of the stacking sequence using the results determined by prior level, while the composite design rule and compliance constraints are applied.
Direct numerical simulation of a supersonic compression corner
Authors: Wu Zhengyuan , Gao Zhenxun , Jiang Chongwen , Lee Chunhian 
Published: May 2020

Abstract
Direct numerical simulation (DNS) of a supersonic compression corner has been performed using a turbulent-library based inflow generation method, which means adding turbulence fluctuations from preexisted turbulence library files on the current inflow boundary. Illustration of application of such method is given. Physically turbulence boundary layer (TBL) can be obtained after a short distance ‘transition’ process. Qualitative results show that the current numerical simulation is able to obtain the fully developed turbulent boundary layer in the downstream and capture the shock structure well. The accuracy and reliability of current method is proved by the comparison of quantified results between DNS and experimental data. The interaction between the shock wave and the turbulent boundary layer near the corner has been analysed. Turbulent intensity is enhanced passed through the shock and the mean velocity profiles in the separation zone have suffered significant changes.
Simulation on Vortex Induced Vibration of Circular Cylinder
Authors: Chang T J , Lua K B 
Published: May 2020

Abstract
In order to study the vortical flow field and the vibration caused by fluid-structure interaction (FSI), an efficient simulation setup was established. The simulation made use of the built-in Deforming Mesh function, Semi-Implicit Method for Pressure Linked Equations (SIMPLE) Algorithm and SST-kw Turbulence Model of Ansys Fluent to generate the flow field. A User Defined Function (UDF) was written to calculate the displacement of the cylinder based on the simulated flow field information. A range of Reduced Velocity was scanned through in order to find the “locked-in” region, which is the resonance occurring region. The present study focused on the forces acting on the cylinder and the resultant trajectory of different cylinder natural frequencies. The simulation needs further fine tuning to improve the accuracy.
An Interplanetary Mission Design of a Solar Sailing CubeSat to Mars
Authors: Tang Andrew J , Wu Xiaofeng 
Published: May 2020

Abstract
While solar sailing missions have been developed in the past, orbital solar sailing missions are limited in number. Increasing access to the solar system can be achieved by leveraging the potential of solar sailing spacecraft. A feasibility study is performed to analyse a controlled solar sailing mission to Mars using a CubeSat platform. The proposal to send a solar sailing CubeSat to Mars would be revolutionary in delivering small payloads to the red planet by harnessing the solar radiation pressure emitted from the Sun. By utilising solar sailing and aerocapture techniques in the mission design, the need for chemical propulsion for transfer and capture is greatly reduced, minimising launch mass and maximizing payload mass efficiency.
In this study, investigations were carried out as mission analyses in the area of trajectory architecture and subsystem overview for systems available today and in the future. The influence and evolution of trajectories under gravitational and environmental conditions on Mars and the interplanetary transfer were scrutinised individually as relevant restricted dynamic systems. For a chosen insertion orbit, several feasible trajectories to Mars based on different solar sail systems were investigated, including optimised ballistic trajectories and the Sundiver transfer for solar sails. For the interplanetary trajectories, the planetary capture manoeuvre of the spacecraft to a serviceable orbit using aerobraking capture is evaluated. The final trajectory design features minimum-time optimisation for the interplanetary transfer of a solar sailing spacecraft from Earth to Mars. As the selected spacecraft platform is limited to low-thrust solar sailing propulsion, severe performance limitations apply to this mission. This work aims to highlight possible interplanetary trajectories for present and future small satellite platforms despite these limitations by using dynamical orbital simulation models.
Projected changes in hot, dry and wet extreme events’ clusters in CMIP6 multi-model ensemble
Authors: Vogel Martha M , Hauser Mathias , Seneviratne Sonia I 
Published: May 2020

Abstract
Concurrent extreme events, i.e. multi-variate extremes, can be associated with strong impacts. Hence, an understanding of how such events are changing in a warming climate is helpful to avoid some associated climate change impacts and better prepare for them. In this article, we analyse the projected occurrence of hot, dry, and wet extreme events’ clusters in the multi-model ensemble of the 6th phase of the Coupled Model Intercomparison Project (CMIP6). Changes in ‘extreme extremes’, i.e. events with only 1% probability of occurrence in the current climate are analysed, first as univariate extremes, and then when co-occurring with other types of extremes (i.e. events clusters) within the same week, month or year. The projections are analysed for present-day climate (+1 °C) and different levels of additional global warming (+1.5 °C, +2 °C, +3 °C). The results reveal substantial risk of occurrence of extreme events’ clusters of different types across the globe at higher global warming levels. Hotspot regions for hot and dry clusters are mainly found in Brazil, i.e. in the Northeast and the Amazon rain forest, the Mediterranean region, and Southern Africa. Hotspot regions for wet and hot clusters are found in tropical Africa but also in the Sahel region, Indonesia, and in mountainous regions such as the Andes and the Himalaya.
Increasing trend in rapid intensification magnitude of tropical cyclones over the western North Pacific
Authors: Song Jinjie , Duan Yihong , Klotzbach Philip J 
Published: May 2020

Abstract
Rapid intensification (RI) refers to a significant increase in tropical cyclone (TC) intensity over a short period of time. A TC can also undergo multiple RI events during its lifetime, and these RI events pose a significant challenge for operational forecasting. The long-term tendency in RI magnitude of TCs over the western North Pacific is investigated in this study. During 1979–2018, a significant increasing trend is found in RI magnitude, which primarily results from the significant increasing number of strong RI events, defined as 24 h intensity increases of at least 50 kt. Furthermore, there are significantly more (slightly fewer) strong RI occurrences west (east) of 155°E in 1999–2018 than in 1979–1998. Significant increases in strong RI occurrences are located over the region bounded by 10°∼20°N, 120°∼150°E. These changes are likely induced by the warming ocean but appear uncorrelated with changes in the atmospheric environment. By contrast, there are slight decreases in strong RI occurrences over the region bounded by 12.5°∼22.5°N, 155°∼170°E, likely due to the offset between RI-favorable influences of the warming ocean and RI-unfavorable influences of increasing vertical wind shear (VWS).
Intersecting vulnerabilities: climatic and demographic contributions to future population exposure to Aedes-borne viruses in the United States
Authors: Rohat Guillaume , Monaghan Andrew , Hayden Mary H , Ryan Sadie J , Charrière Elodie , Wilhelmi Olga 
Published: May 2020

Abstract
Understanding how climate change and demographic factors may shape future population exposure to viruses such as Zika, dengue, or chikungunya, transmitted by Aedes mosquitoes is essential to improving public health preparedness. In this study, we combine projections of cumulative monthly Aedes-borne virus transmission risk with spatially explicit population projections for vulnerable demographic groups to explore future county-level population exposure across the conterminous United States. We employ a scenario matrix—combinations of climate scenarios (Representative Concentration Pathways) and socioeconomic scenarios (Shared Socioeconomic Pathways)—to assess the full range of uncertainty in emissions, socioeconomic development, and demographic change. Human exposure is projected to increase under most scenarios, up to + 177% at the national scale in 2080 under SSP5*RCP8.5 relative to a historical baseline. Projected exposure changes are predominantly driven by population changes in vulnerable demographic groups, although climate change is also important, particularly in the western region where future exposure would be about 30% lower under RCP2.6 compared to RCP8.5. The results emphasize the crucial role that socioeconomic and demographic change play in shaping future population vulnerability and exposure to Aedes-borne virus transmission risk in the United States, and underline the importance of including socioeconomic scenarios in projections of climate-related vector-borne disease impacts.
Reducing waste on wheat flour packaging: an analysis of Lean Six Sigma
Authors: Sucipto  , Susilowati E , Effendi U 
Published: May 2020

Abstract
Reducing defects in the process of packaging wheat flour is important to be done continuously. This study aims to identify and measure the activity of waste that occurred, performance sigma value, and obtain solutions which do by the researcher in Consumer Packing Division PT Z. Waste is measured and assessed using the methods of Lean Six Sigma and Failure Mode and Effect Analysis (FMEA). Based on research, activity categorized waste activities include Defect, Waiting, Non-Utilizing People’s Talent, Transportation, and Motion. Measurement focused on the largest waste Defect is Broken Pack. The result showed the defect per million opportunities (DPMO) value 4089.2475 with level sigma 4.14 and capability process (Cp) 1.31. FMEA showed eight causes factors of the failure broken pack. Four failure mode of which exceeds the critical value that is less of a response operator (Risk Priority Number or RPN=150), lack of control of packaging (RPN=126), less-skilled workers (RPN = 120) and the inaccuracy of allocating the number of workers (RPN=105). Therefore, on the job training, proper allocation of workers during breaks, the packaging audit of the suppliers, and increase the number of workers needed to support the packaging efficiency of wheat flour.
Some physical and mechanical properties of fermented Keluwak (Pangium edule Reinw) seed
Authors: Hawa L C , Wibisono Y , Roliannisa  
Published: May 2020

Abstract
Fermented seed of the tropical tree Pangium edule Reinw., locally known as Keluwak, have been used as spices in Asian and especially Indonesia cuisine. For further processing and postharvest handling, physical and mechanical properties of the seed are needed. Some physical properties, i.e. length, width, thickness, geometric mean diameter, sphericity, surface area, unit mass and 100-mass of seeds, fraction by weight, true volume, true density, bulk density, porosity, and coefficient of static friction at five different surface (cardboard, stainless steel, iron plate, glass, and plywood) of Keluwak seeds were evaluated at the market moisture content. Also, some mechanical properties, i.e. rupture force, strain, stress and Young modulus at three dimensions axis have been measured. The average length, width, thickness, geometric mean diameter, unit mass and per 100 seeds were 44.94±5.6 mm, 43.35±5.2 mm, 27.40±3.4 mm, 37.36±3.2 mm, 11.47±3.7 g and 1693.39±483.85 g. In the market moisture content, the results indicated 0.87±0.07, 4413.99±733.22 mm2, 1.01±0.01 g/cm3, 0.42±0.03 g/cm3, 58.21±3.37% and 69.10±13.84% for average sphericity, surface area, true density, bulk density, porosity and peel ratio of the seed, respectively. Angle of friction for respective cardboard, stainless steel, iron plate, glass, and plywood were 25.52±6.9 deg, 17.40±3.92 deg, 21.40±5.2 deg, 12.27±42 deg, and 24.8±7.45 deg. The average compressive force needed to break the seed at length, width, and thick axis were 295.34±87.95 N, 283.87±83.90 N, and 215.71±65.53 N. The strain, stress, and Young modulus were 0.095±0.03, 2.10±0.71 N/mm2, and 23.16±7.20 N/mm2 at length axis; 0.069±0.03, 2.66±0.88 N/mm2, and 45.44±20.95 N/mm2 at width axis; 0.05±0.02, 2.05±0.63 N/mm2, and 48.12±22.61 N/mm2 at thick axis, respectively.
Computational fluid dynamics analysis of mini membrane module flow behavior
Authors: Wibisono Y , Migunani Y , Darmanto  , Choiron M A 
Published: May 2020

Abstract
A newly developed green ultrafiltration membrane has been successfully made by utilizing natural antibiofoulant impregnated cellulose acetate mixed matrix membranes. The extract impregnated into cellulose acetate polymer to form mixed matrix membranes with higher and foodgrade antibiofouling properties. In order to evaluate mixed matrix membrane mass transport, a specialized mini membrane modules has been developed. This study utilizing computational fluid dynamics (CFD) simulation to evaluate fluid distribution in rectangular, quadrilateral and circular narrow channels. Three different superficial velocities which are normally found in spiral wound membrane modules were evaluated, i.e. 0.11, 0.16 and 0.2 m/s. Trans-membrane pressure normally used in ultrafiltration processes were evaluated, i.e. 50, 100, and 150 kPa. Based on CFD analysis, circular channel provides a more uniform and distributed velocity stream compare to the others. The circular shape also provide advantage on managing superficial feed flow inside the membrane channel, compared with rectangular and quadrilateral shapes channel. The mini membrane modules potentially reduces laboratory scale research cost, while maintaining the similar operating variables of larger scale.
Prediction of tomatoes maturity using TCS3200 color sensor
Authors: Sandra  , Damayanti R , Hendrawan Y , Susilo B , Oktavia S 
Published: May 2020

Abstract
Vitamin C (ascorbic acid) increased as the maturity advances from green to fully ripe stage and ascorbic acid showed continuously increasing patterns throughout ripening until the red stage. Vitamin C analysis with an invasive method at a laboratory, will cause damage to the sample, require a long time, and can not be used in further measurements. Digital image processing techniques as noninvasive method can predict the maturity of tomatoes and vitamin C non-destructively. The purpose of this study was to design a digital image system to predict tomatoes maturity automatically, simply and practically. RGB digital image and vitamin C content are used as a database system to predict maturity on tomatoes. The performance test used 30 pieces of unripe, medium and ripe tomatoes. The result shows each maturity phase of the tomato has a different RGB value. The Green value decreases with an increasing level of tomato maturity. Red values tend to be the same because tomatoes have a red index from the beginning of their ripeness. From the database of RGB and vitamin C, the equipment shows that unripe level of maturity with RGB values below 10 have vitamin C content about 29.5, medium level of maturity with RGB value between 11-23 have vitamin C content about 33.4, and ripe level with RGB values above 23 have vitamin C content approximately 36.9. The result of the performance test shows that it can detect tomatoes maturity by obtaining a success rate of 93%.