Yogyakarta, Indonesia

State University of Yogyakarta

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Yogyakarta, Indonesia
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Khairudin M.,State University of Yogyakarta
International Journal on Smart Sensing and Intelligent Systems | Year: 2016

This paper presents theoritical and experimental design of a robust control based on quantitative feedback theory (QFT) approach to control deepness variations on cutting process for a spindle of lathe machine. The dynamics of a spindle is uncertain and varying due to deepness variation on cutting process. Practical design steps are explained in which QFT based conditions are assembled to obtain a compensator and pre-filter gain to control a spindle. The robust controller show an advantage control the system under various cutting conditions. The performances of the proposed controller are evaluated in terms of input tracking capability of the spindle responses and speed responses of a spindle incorporating deepness on cutting process. Experimental results show that QFT based robust control provides the improvement of robustness and performances.


Dwiningrum S.I.A.,State University of Yogyakarta
Disaster Prevention and Management | Year: 2017

Purpose: The purpose of this paper is to create a valid and fit instrument to measure school resilience, and to understand teachers’ and students’ contributions to build school resilience. Design/methodology/approach: The construct of school resilience is adapted from Henderson and Milstein’s (2003) concept regarding two factors: mitigating risk factor in environment and building resilience in the environment. Senior high school teachers and students in a disaster-prone area in Indonesia were chosen as the sample using purposive sampling technique. Findings: The results of this research are that the instrument is considered as good, valid, reliable, and fit for measuring the students’ and the teachers’ contributions in building school resilience; and the results of the confirmatory factor analysis test of the hypothesized model of school resilience of teachers and students in a disaster-prone area are in line with the empirical data. Based on the analysis of the value of the major loading factors, teachers and students show different contributions. In building school resilience for disaster mitigation, teachers begin by mitigating risk factor in the environment whereas students tend to give a priority to build resilience in the environment. Practical implications: The results of this study are applicable to develop school resilience on disaster mitigation, and the instrument of the research provides a practical contribution to broader research scope, in terms of different population, school level, socio-cultural background, and disaster-prone area. Originality/value: This study presents reliable instrument to measure teachers and students’ contribution in building school resilience. This study also sought to understand the different contributions shown by teachers and students in building school resilience for disaster mitigation. © 2017, © Emerald Publishing Limited.


A theoretical study of the dynamical mechanism of Coulomb blockade using the totally asymmetric simple exclusion process (TASEP) consisting of only one site has been laid down in [1]. Coulomb blockade is the main idea behind the so-called quantum dot, which is a product in the advancement of nanotechnology. A quantum dot is a nano-scale system, which consists of only one electron. It offers exciting opportunities in the creation of semiconductor fabrication technology. In this study, a further examination is conducted into the relationship of the Coulomb blockade and the TASEP by obtaining numerical results of the density and current density of the electron trapped inside the dot as well as the tunneling of the electron through the dot. The results show that the density and current density agree with the electron being trapped inside the dot with high density and low current density, and the electron passing through the dot with a moderate value of the density and current density. © 2016 Author(s).


Suyanto S.,State University of Yogyakarta
AIP Conference Proceedings | Year: 2017

Indonesian government assigned a new curriculum in 2013, namely Curriculum of 2013 (C13). Recently, the implementation of the C13 has come up with a big controversy because it was setting back to the previous curriculum of KTSP (Scholl-based Curriculum) for majority of schools. Were the schools not ready to implement the curriculum of 2013? This research was a survey research to give evidence on the school readiness in implementing the new curriculum and to find the problems of the curriculum implementation. The samples of the research were 33 junior high schools from seven regencies in Indonesia. The respondents were 33 school principals and vice principals for curriculum affair, 200 teachers, and 200 students. The data were collected by using questionnaires, interview, and obsevation checklists. The data were taken during monitoring and evaluation programs facilitated by the Indonesian Directorate of Junior High School Development Management. The results indicates that (1) the readiness of the schools was 9 schools (27.27%) were ready, 17 schools (51.52%) were less ready, and 7 schools (21.21%) were not ready to implement the new curriculum; (2) the readiness of the schools was affected by the poor of the books' availability, only 23% of schools had complete student books, the number trained teachers, only 33% of teacher got training, the ICT access, only 17% of school have a good ICT access for all students, and teachers' understanding on the learning and assessment process, only 37% of teacher had good understanding on the new curriculum. The teacher had difficulties on (1) developing a lesson plan (16%), (2) using scientific approach (31,5%), (3) implementing authentic assessment (43,5%). Students mostly (78,5%) said that learning with the new curriculum is more difficult than it was before. Therefore, specific training on the new curriculum implementation is still needed. © 2017 Author(s).


Setyaningrum W.,State University of Yogyakarta
AIP Conference Proceedings | Year: 2017

This study investigated attitudes of pre-service mathematics teachers towards English as one of the subject at the university. It is a qualitative study in which questionnaire and face-to-face interview were employed to collect the data. The participants of this study were sixty students of mathematics education department at one of the university in Yogyakarta. The main research question was concern with how pre-service mathematics teachers perceive the importance of learning English. This study found that most of the participants perceive English as an important language that should be acquired by mathematics teachers. Their beliefs about the importance of English were mostly due to instrumental orientation rather than integrative orientation, such as getting a good job, getting a scholarship and understanding learning sources that are written in English. The data also revealed some obstacles faced by pre-service mathematics teachers in learning English as an additional language for them. The main obstacles were related to the differences between English for mathematics and English in daily life including its vocabulary and structure. Most of the participants argued that several mathematics vocabularies had precise meaning and different from daily English. In addition, they found difficult to understand some sentences used in the paper journal due to its structure. This study therefore, provided an insight into the pre-service mathematics teachers' perception and obstacles when learning English that could be use in improving pre-service teachers' education. © 2017 Author(s).


Wijaya A.,State University of Yogyakarta
AIP Conference Proceedings | Year: 2017

The present study investigates Indonesian fourth-graders low performance in dealing with fractions in TIMSS 2015. Furthermore, the present study also explores possible reasons for this low performance. The data for this study was drawn from TIMSS 2015 data which included test results and responses to Teacher Questionnaire. Descriptive statistics was used to analyze the data. Indonesian textbooks were also analyzed to portrait a broader scope of possible reasons for students' low performance. The analysis of TIMSS test result reveals that Indonesian students, in comparison to students from other countries, had low understanding of the basic concepts of fractions. From the Teacher Questionnaire it was found that a possible reason for this low understanding was the Indonesian curriculum for third grade which gave low emphasis on the basic concepts of fractions and introduced operations of fractions rather early. Furthermore, the result of textbook analysis shows that Indonesian textbooks restricted only to one definition of fractions, i.e. fractions as parts of wholes. This finding might also explain Indonesian fourth graders' low understanding of fractions. © 2017 Author(s).


Istiyono E.,State University of Yogyakarta
AIP Conference Proceedings | Year: 2017

The purpose of this research is to describe the results of higher order thinking skills in physics (PhysHOTS) measurement including: (1) percentage of PhysHOTS level and (2) percentage of the domination of response in the category of students in each analyzing, evaluating, and creating skill. There were 404 10th grade students in Bantul District as the respondents of this research. The instrument used for measurement was PhysReMChoTHOTS. It was divided into two sets consisting of 44 items and including 8 anchor items stated valid by a Physicist, Physics Education Expert, and Physics Education Measurement Expert. The instrument was fit to PCM. The reliability coefficient of this test is 0.71, while the difficulty index of the items ranges from -0.61 to 0.51. The results of the measurement show that: (1) The percentage of each category of PhysHOTS for the 10th grade students in Bantul District for the very low, low, medium, high, and very high category is 4.75 %, 40.30 %, 33.45 %, 19.50 %, and 2.00 %, respectively; and (2) The order in analyzing skills, starts from the weakest, is attributing, differentiating and organizing. The order in evaluating skills, starts from the weakest, is critiquing and checking. Meanwhile, the order in creating skills, starts from the weakest, is producing, planning, and generating. © 2017 Author(s).


Wijaya A.,State University of Yogyakarta
AIP Conference Proceedings | Year: 2017

This study was aimed to explore undergraduate students' modeling competences. A total of 36 undergraduate students were involved in the study. These students worked in groups to solve a modeling task which was presented in GeoGebra application. The students' modeling competence was investigated before and after the use of metacognitive instruction. The study shows that the students could make a mathematical model or mathematical question of the modeling task. However, prior to the use of metacognitive prompt the students mainly focused on exploring the features of GeoGebra application rather than on identifying mathematical strategies. After the use of metacognitive prompt, the students shifted from feature-based strategies to mathematical strategies. The results of this study indicate that metacognitive prompt is helpful to direct students to think about mathematical concepts or strategies which are relevant to a modeling task. © 2017 Author(s).


Retnowati E.,State University of Yogyakarta
Journal of Physics: Conference Series | Year: 2017

Students themselves accomplish Knowledge acquisition and automation. The teacher plays a role as the facilitator by creating mathematics tasks that assist students in building knowledge efficiently and effectively. Cognitive load caused by learning material presented by teachers should be considered as a critical factor. While the intrinsic cognitive load is related to the degree of complexity of the material learning ones can handle, the extraneous cognitive load is directly caused by how the material is presented. Strategies to present a learning material in computational learning domains like mathematics are a namely worked example (fully-guided task) or problem-solving (discovery task with no guidance). According to the empirical evidence, learning based on problem-solving may cause high-extraneous cognitive load for students who have limited prior knowledge, conversely learn based on worked example may cause high-extraneous cognitive load for students who have mastered the knowledge base. An alternative is a faded example consisting of the partly-completed task. Learning from faded-example can facilitate students who already acquire some knowledge about the to-be-learned material but still need more practice to automate the knowledge further. This instructional strategy provides a smooth transition from a fully-guided into an independent problem solver. Designs of faded examples for learning trigonometry are discussed. © Published under licence by IOP Publishing Ltd.


The use of information technology to support the business organization's performance is one thing that needs to be done by large-scale industrial sector and small industrial sector (SMEs) to face global competition. As a developing country, the SMES sector in Indonesia is still not fully adopt and utilize information technology (IT) in the business process. Factors of contributors, inhibitors and the effect of the competitive environment and government support will tend to trigger SMEs to adopt IT. This study tries to explore the influence Contributor, Inhibitor, Government Support, and Competitor Pressure, to Technology Readiness (H1, H2, H3, H4), and the Influence of Technology Readiness on Behavioral to Use (H5). The study used 446 valid sample of SMEs of craft industry and being tested using the Partial Least Square (PLS) technique. The testing result shows that the Contributor and Inhibitor have the significant effect on the Technology Readiness with p-value of.000 (<0.05) (H1 and H2 were supported). The testing result of the Technology Readiness on the Behavior to Use also shows the significant result with the p-value 0.00 (<0.05) (H5 was supported). The test of the effect of the Government Support and Competitor Pressure shows the insignificant result with the p-value of 0.81 and 0.53 (>0.05) (H3 and H4 were not supported). Further analysis also found that the Government Support and Competitor Pressure do not affect on the IT users (Behavior to Use) in SMEs. The finding also strengthen the previous claim that the Government Support and the Competitor pressure are not the component which make SMEs ready to adopt and use the IT on their business process. © 2015 The Authors.

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