bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimizing the traffic control system of Sultan Agung street Yogyakarta using fuzzy logic controller
Authors: Mualifah L N A , Abadi A M 
Published: November 2019

Abstract
The traffic control system is a system that functions to regulate and control traffic flow at crossroads, pedestrian crossings (zebra crossing) and other traffic flows. A good traffic control system is a system that is able to adjust the duration of the traffic lights with the density of traffic flow automatically. In big cities like Yogyakarta, traffic congestion is one of the most common problems. It is caused by the traffic lights that use a conventional regulation system. This study aims to discuss the establishment of a traffic light regulation system on Sultan Agung street and surrounding areas where there are nearby traffic lights and are interrelated with one another. Determining the duration of the green light is calculated using the fuzzy logic controller method with 3 input variables namely the number of cars, the number of motorcycles, and the length of the queue. The results of the traffic light regulation system using fuzzy logic controllers are more effective than conventional system settings. It is because the system is able to adjust the duration of the traffic lights with traffic conditions at that time, so the duration of traffic light is varied for each traffic conditions.
The Improvement Technique in Assessing Teaching Skills using Fuzzy Weighted Grading Method
Authors: Andayani S 
Published: November 2019

Abstract
The assessment of education is the process of providing the decision on the performance and quality of student achievement. Many cases indicate that the educational assessment involves many criteria of uncertain value, and therefore fuzzy assessment studies have grown rapidly in recent years. In this paper, a method is proposed to improve the assessment of the basic teaching skills of prospective teachers in a Micro-teaching course by using a fuzzy grading system. This method is also based on group decision-making (GDM) because it involves several decision makers who give preferences in the assessment process and negotiate to determine the criteria and sub-criteria for the assessment. The result of the method is a fuzzy value which is represented by a letter grade for the Micro-teaching course and letter grade for each of the basic teaching skills. By using this method, students may have the same final grade, but their mastering of teaching skills is very different.
An Analysis of Errors in Solving Limits of Algebraic Function
Authors: Nurhayati Rosnida , Retnowati Endah 
Published: November 2019

Abstract
By knowing types of mistakes made by students when solving mathematics problems, teacher can choose right learning strategy to avoid similar errors. This study aims to identify students’ errors in solving problems on limits of algebraic function. A total of 30 students in Yogyakarta vocational school who have studied concept of limits algebraic function, were asked to complete six questions without looking at the book in 45 minutes. Documents on student work were corrected by three mathematics teachers and identified the type of error that appeared. The results of the study are categorized into two types of errors: (1) procedural errors, including: errors not writing lim appropriately during executing limits, errors in substituting values into variables, errors not simplifying the final results, or no attempts; (2) conceptual error, including: errors in clearing fractions, errors in factoring, errors in rationalisation.
Increasing HOTS and student belief towards mathematics through learning with a roleplaying method
Authors: Sumantri C M S , Widjajanti D B 
Published: November 2019

AbstractBelief in mathematics attitude of students towards mathematics, where students can give a positive or negative response to mathematics learning activities. Students are given math problems and when completing them, they will think first, then when finishing them, students are expected to be sure of the answers and the concepts they use are correct. When students experience difficulties in solving problems, negative beliefs appear in students because they feel unsure of the right answer. To help students so that confidence in mathematics (belief in math)becomes better, it is necessary to have an interesting learning method for students, namedrole-playing.The methodof role-playingis a learning method that prioritizes the role of students in the classroom, the teacher just gives the material without giving an explanation, and the rest of the students will deliver the material in a different way so that other students understand. Submission of different material uses a role-playing orrole-playing game, where students will play in a social environment and deliver material through previous roles compiled by the teacher using ahigh order thinking skill (HOTS) system.So, students are free to deliver material in accordance with what they understand and can be connected in a coherent way.
Djalaluddin Gorontalo Airport Passenger Data Forecasting with Holt’s-Winters’ Exponential Smoothing Multiplicative Event-Based Method
Authors: Djakaria Ismail 
Published: November 2019

Abstract
An appropriate time series model for predicting passenger data of Djalaluddin Gorontalo Airport, the interval between 2003 - 2017 with the multiplicative of Holt’s-Winters’ exponential smoothing as

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, so the smoothing parameter used are α = β = γ = 0.2. After several treatments, the mean square deviation (MSD) is 3287241 for arrival passenger data and MSD is 2490279 for passenger departure data with a seasonal length of 12 by do not event-based. The next, the MSD is 1334585 for arrival passenger data and MSD is 1433867 for passenger departure data with a seasonal length of 12 by Eid al-Fitr event-based, the MSD is 1259600 for arrival passenger data and MSD is 1252548 for passenger departure data with a seasonal length of 12 by Eid al-Adha event-based.
Comparison of Modelling Tasks in Indonesian and Singaporean Mathematics Textbooks
Authors: Syam S S , Wijaya A , Retnawati H 
Published: November 2019

Abstract
The ability of students to apply mathematics has been regarded as an important goal of mathematics education in many countries, including Indonesia and Singapore. One of such abilities is the competence of mathematical modelling. Presenting students with mathematical modelling task is one of the efforts to improve their competence of mathematical modelling. This study aims to describe the characteristics of mathematical modelling task in Indonesian and Singaporean mathematics textbooks. This study used a qualitative approach with content analysis technique. The books analyzed in this study were an Indonesian mathematics textbook published by the government and a Singaporean mathematics textbook: Discovering Mathematics. Classification category for the modelling tasks is adapted from the classification made by Katja Maaß (2010). The results of analysis showed that there is no significant difference between Indonesian and Singaporean mathematics textbooks. Indonesian mathematics textbook contains contexts that are still small as well as Singaporean mathematics textbook. Therefore, more comprehensive research is needed with regard to curriculum content and learning strategies in Indonesia and Singapore.
An analysis mathematical problem solving and mathematical critical thinking skills of junior high school students
Authors: Susanti E , Hartono  
Published: November 2019

Abstract
This article describes mathematical problem solving and critical thinking skills and examines the relationship between junior high school students’ problem solving skills and critical thinking skills in learning mathematics. The research samples consisted of thirty-six students at the age of 13 to 14 having mathematical abilities on above average who were selected through purposive random sampling technique from one public junior high school of Yogyakarta. Data were obtained from tests of problem solving skills and critical thinking skills. Both instruments are essay questions. Quantitative analysis is used to determine level of problem solving skills, level of critical thinking skills, and relationship between them. The results revealed that the average of students’ problem solving skills and mathematical critical thinking skills was in the medium criteria where critical thinking skills were slightly higher than problem solving skills. Besides, the relationship between them belonged to medium category.
An Analysis of Student Difficulties in Solving the Word Problem
Authors: Habibullah  , Hartono  
Published: November 2019

Abstract
This research is a qualitative descriptive research that aims to describe the types and factors of difficulty in solving mathematics problems in the form of word problems. The research subjects were 22 students who were selected by random sampling technique from one of the junior high schools in Indragiri Hilir. The data was collected through diagnostic tests and interviews conducted openly but not structured. In analyzing the students’ difficulties, the revised Bloom’s Taxonomy theory was used to find the difficulties in factual, conceptual, procedural, and metacognitive knowledge. The results of research showed that 14.77% of students had difficulties in factual knowledge, 17.05% of students had difficulties in conceptual knowledge, 45.46% of students had difficulties in procedural knowledge, and 53.41% of students had difficulties in metacognitive knowledge. The factors that cause difficulties were experienced by students, such as: their sense in lack of time, carelessness, anxiety, giving up easily, and being hasty in doing the given problem.
Expanding hypothetical learning trajectory in mathematics instructional
Authors: Ulfa Charina , Wijaya Ariyadi 
Published: November 2019

AbstractThe purpose of this article is to present a description of Hypothetical Learning Trajectory (HLT) which can be used as an instrument in mathematics learning activities in the classroom. More than 25 years, HLT has been introduced and developed in every learning especially mathematics learning. An HLT is developed based on the learning objectives, characteristics of students and the material to be taught. In HLT contains three important things that are: (1) learning objectives, (2) learning activities used in building students’ knowledge, and (3) allegations of the learning activities process. This article uses a literature review of previous theories. HLT can be developed with various learning methods that are adjusted to the characteristics of students and the material to be taught. However, this article only discusses important things that need to be considered in the development of HLT in mathematics learning. So that it is obtained that HLT can help students in building knowledge in a reflective manner.
Identification of student’s metacognition level in solving modeling mathematical problem
Authors: Thufaila Dewi , Sugiman  
Published: November 2019

Abstract
This study aims at identifying the students’ metacognition level in solving mathematical modeling problem. Subjects of this study is eight seventh grade students in junior high school which selected based on their latest mathematics test exam score and communication ability test. The results of this study are obtained by using mathematical modeling problem test and interview. The results of this study are that students in the tacit use level is not know the reason why did they use the certain ways that they did to solve the problem, most of the time they just use ‘try and error’ method. Students in the aware use already know the reason why they use a certain ways to solve a certain problem. Students in the strategic use are capable on create their own strategy before solving the problem. Students in reflective use are not only building a plan before solving the problem, but also reflecting and evaluating during and after they obtain the result of the problem.
Student-teacher’s perception of mathematical representation in mathematics learning
Authors: Novianti M , Retnawati H 
Published: November 2019

Abstract
This research aims to know student-teacher’s perception of mathematical representation in mathematical learning. This research is a qualitative research. The subject of this research are 12 student-teacher. Data collection technique are carried out through interview. Data analyze using Bogdan and Biklen. Data analysis includes steps to collected data, reducted data, categorizing the data and made conclusions. The result show that the twelve subjects can describe the definition of mathematical representation. The subjects considered mathematical representation is important in mathematical learning, which is for: 1) Understanding the concepts, 2) Problem Solving, 3) Construction the concepts and 4) Communication. The subjects considered that it is difficult to develop mathematical representation in mathematical learning.
Experimental investigation on the effect of geometry on cryogenic transfer line chilldown
Authors: Mohammed Jesna , Rasheed Rizwan , Junaid Faraz P , Roy K E Reby 
Published: November 2019

Abstract
In order to analyze the effect of geometry on cryogenic chilldown, experiments were performed on straight, one twisted and twin twisted copper tubes using liquid nitrogen. Data presented in this paper is for the experiments conducted under terrestrial gravity conditions at supply pressures of 1.2 bar and 1.3 bar. Test sections considered were copper tubes (7.9375 mm OD, 0.8128 thick) of straight, one twisted and twin twisted geometry traversing a distance of 220mm under Polyurethane foam insulation. Pressure measurements at test section inlet and outlet was monitored using transducers. Temperature measurement at four equidistant sections along the length were tracked in real-time using a data acquisition system. Temperature and pressure profiles were obtained. The results of the experiment indicated that, for a given mass flux, the transition during chilldown occurs earlier in one twisted transfer lines compared to straight and twin twisted tubes. This indicates the earlier occurrence of film boiling for the one twisted channels. Thereby, changing the transfer line geometry from straight tubes to one twisted sections, the chilldown time can be reduced to a considerable extend further resulting in reduction of cryogen consumption during the initial stages of transfer process.
Helmholtz resonator based metamaterials for sound manipulation
Authors: Mahesh K , Mini R S 
Published: November 2019

Abstract
Metamaterials are tailored artificial structures that received wide attention now a days due to their extraordinary properties like negative density, negative bulk modulus, negative permeability, negative refractive index etc.. Shape, geometry, size, orientation and arrangement of the basic units in metamaterials give them their smart properties capable of manipulating electromagnetic and acoustic waves by blocking, absorbing, enhancing, or bending waves to achieve benefits that go beyond what is possible with conventional materials. Acoustic metamaterial with Helmholtz resonators (HRs) is considered in this study. The behaviour of acoustic waves in the presence of array of Helmholtz resonators in series and parallel arrangement is studied numerically using finite element method. Series arrangement of Helmholtz resonators resulted in the extraordinary transmission of acoustic waves of certain frequencies and parallel arrangement resulted in the focusing of sound.
Influence of nano (h –BN) cutting fluid on machinability of Inconel 625
Authors: Singh Pariniti , Padhy Chinmaya P. 
Published: November 2019

Abstract
Inconel 625 has got wide applications across industries (aerospace, petrochemical etc.) in various machining operations. During machining, large amount of heat is generated due to the friction, lowering the tool life and adding to various wear mechanism. This is sorted by conventional cooling/lubrication, but, with its harmful effect on environment and human health, it’s imperative to pursue other cleaner, greener though efficient alternatives. In this regard, MQL assisted with h-BN nano fluid is an effective option. Hexagonal Boron Nitride (h-BN) having unique structure and composition displays advanced mechanical properties which enhances its versatility in applications. To investigate effectiveness of nano (h –BN) cutting fluid on machinability, first h-BN nanofluid was prepared and characterized for its mechanical properties for nanoparticle concentrations (0.05,0.1 % Vol.). Further, the machining performance and sustainability associated with turning of Inconel-625 under different lubricating conditions viz. dry, wet, MQL with conventional cutting fluid and MQL with (h-BN) nano cutting fluid (NCF) are investigated for machining characteristics. Results showed that MQL integrated with h-BN nano cutting fluid is an effective and sustainable option.
Comparison of Mechanical Properties of Zn-27A1 Alloy Using Various Casting Techniques
Authors: Sreejith J , Nishad K , Krishnadas M , Krishnaprasad C N , Muralidharan Mamatha , Krishnaprasad V , Rajesh Menon B 
Published: November 2019

Abstract
Zinc-aluminium alloys are cost effective substitute for wide range of applications in the industrial purpose mainly as bearing materials. Zn- 27 Al is the material selected due to its good mechanical and tribological properties. Casting is one of the methods which can be used to fabricate the alloys. Sand casting and stir casting are used to develop Zn- 27 Al alloy. Both mechanical and wear properties were studied. Hardness, tensile strength and impact strength is highest for the stir casted alloy when compared to sand casted Zn-27 Al.. The composition of the prepared alloys justifies the better properties of stir casted alloy and the compositions are analysed by Energy Dispersive X-Ray (EDX) analysis.
Measurement science in methodological instruction of Ph.D. students of technoscience
Authors: Morawski Roman Z 
Published: November 2019

Abstract
Technoscience is a result of integration of technology with empirical sciences, including not only physical sciences, but also life sciences, social sciences and cognitive sciences. The development of technoscience is unthinkable without measurement and mathematical modelling, being two interrelated operations used for acquisition and representation of knowledge. Measurement fundamentals must, therefore, belong to the core of methodological instruction of Ph.D. students of technoscience. This keynote speech will provide an outline of a graduate course on methodological aspects of technoscientific research, whose programme includes conceptual analysis of the dialectical relationship between measurement and mathematical modelling, of the role of measurement in scientific explanation, of the role of measurement in the context of discovery and in the context of justification, as well as of the role of measurement in mitigating uncertainty of scientific knowledge.
Probabilistic measurement modelling may overcome the opposition between the Bayesian and the frequentistic views
Authors: Battista Rossi Giovanni , Crenna Francesco 
Published: November 2019

Abstract
The probabilistic modelling of measurement systems is discussed, in regards to uncertainty evaluation and different models representing the same real system from different standpoints are compared. We suggest that proper probabilistic modelling directly yields evaluation of measurement uncertainty, without making any commitment to specific philosophical schools, such as the frequentistic and the Bayesian ones. We suggest that this model-based approach may have advantages in education and in the development of recommended practices in measurement.
Dissolved oxygen and pH detection system based on the fluorescence characteristics of coumarin-modified CdSe quantum dots
Authors: Zheng Chao , Tao Wei , Liu Quan , Lv Na , Wang Kan , Zhao Hui 
Published: November 2019

Abstract
In the field of biomedicine, the pH and dissolved oxygen (DO) content of the cell metabolism fluid can reflect the health of the cell and provide an auxiliary reference for the early detection of cancer. Based on the preliminary research results of the same group, a dual-parameter synchronous detection system for cell metabolic fluid was established. The system is based on the fluorescence characteristics of 7-Amino-4-methylcoumarin-modified CdSe quantum dots. Both of pH and DO are solved by the voltage signal of the photodetection module. Firstly, the characteristics of 7-Amino-4-methylcoumarin-modified CdSe quantum dots were introduced. Then the dual-parameter detection method was briefly proposed. Next, the hardware components and software functions of the system were introduced. Finally, the detection algorithm was proposed and the solution model was built according to the calibration experiment. The verification experiment showed that the sensitivity for detecting pH was 0.05 and the accuracy was 0.07. The sensitivity for detecting DO was 0.04 mg/L, and the accuracy was 0.07 mg/L. As the prototype machine, the system can basically realize the dual-parameter detection of the cell metabolism liquid with high accuracy, fast speed and small loss of the original liquid.
Conformity assessment of glare in buildings considering the uncertainty of the parameter UGRL
Authors: Ribeiro A S , Martins L , Santos A 
Published: November 2019

Abstract
The evaluation of discomfort related to glare is a common need in buildings, requiring conformity assessment defined in the standard EN 12464-1:2011, using the parameter UGRL
index and a related scale with threshold levels associated with perceptible behaviour transitions. The scale is defined for a dimensionless parameter related to the degree of psychological (discomfort) glare of an electric lighting installation in an indoor space. The aim of this paper is to provide a comprehensive understanding of the role of the UGRL
uncertainty in the conformity assessment procedure, being a critical quantity used in the definition of a decision rule under the new edition of the ISO / IEC 17025 standard. The impact of the uncertainty of the UGRL
quantity is shown using examples of decision rules in measurements near the transition limits of the scale.
Can there be one meaning of “measurement” across the sciences?
Authors: Mari Luca , Maul Andrew , Wilson Mark 
Published: November 2019

Abstract
The International Vocabulary of Metrology (VIM) gives the following definition of ‘measurement’: “process of experimentally obtaining one or more quantity values that can reasonably be attributed to a quantity”. In pursuit of a common understanding of measurement, we explore this condition of reasonableness across the sciences, asking in particular whether there are common features of the structure of measurements in different fields of study that could meet this criterion. We propose that a general sufficient condition for measurement is that it is an experimental process of evaluation of empirical properties that produces explicitly justifiable information, which, we argue, is consistent with characterizations of science and epistemology more generally.