Digital Commons Network^™

Exposing And Fixing Causes Of Inconsistency And Nondeterminism In Clustering Implementations, Xin Yin

Dissertations

Cluster analysis aka Clustering is used in myriad applications, including high-stakes domains, by millions of users. Clustering users should be able to assume that clustering implementations are correct, reliable, and for a given algorithm, interchangeable. Based on observations in a wide-range of real-world clustering implementations, this dissertation challenges the aforementioned assumptions.

This dissertation introduces an approach named SmokeOut that uses differential clustering to show that clustering implementations suffer from nondeterminism and inconsistency: on a given input dataset and using a given clustering algorithm, clustering outcomes and accuracy vary widely between (1) successive runs of the same toolkit, i.e., nondeterminism, and …

Model Checks For Two-Sample Location-Scale, Atefeh Javidialsaadi

Dissertations

Two-sample location-scale refers to a model that permits a pair of standardized random variables to have a common distribution. This means that if X₁ and X₂ are two random variables with means µ₁ and µ₂ and standard deviations ?₁ and ?₂, then (X₁ - µ₁)/?₁ and (X₂ - µ₂)/?₂ have some common unspecified standard or base distribution F₀. Function-based hypothesis testing for these models refers to formal tests that would help determine whether or not two samples may have come from some location-scale …

On Performance Optimization And Prediction Of Parallel Computing Frameworks In Big Data Systems, Haifa Alquwaiee

Dissertations

A wide spectrum of big data applications in science, engineering, and industry generate large datasets, which must be managed and processed in a timely and reliable manner for knowledge discovery. These tasks are now commonly executed in big data computing systems exemplified by Hadoop based on parallel processing and distributed storage and management. For example, many companies and research institutions have developed and deployed big data systems on top of NoSQL databases such as HBase and MongoDB, and parallel computing frameworks such as MapReduce and Spark, to ensure timely data analyses and efficient result delivery for decision making and business …

Coherent Control Of Dispersive Waves, Jimmie Adriazola

Dissertations

This dissertation addresses some of the various issues which can arise when posing and solving optimization problems constrained by dispersive physics. Considered here are four technologically relevant experiments, each having their own unique challenges and physical settings including ultra-cold quantum fluids trapped by an external field, paraxial light propagation through a gradient index of refraction, light propagation in periodic photonic crystals, and surface gravity water waves over shallow and variable seabeds. In each of these settings, the physics can be modeled by dispersive wave equations, and the technological objective is to design the external trapping fields or propagation media such …

Private And Federated Deep Learning: System, Theory, And Applications For Social Good, Han Hu

Dissertations

During the past decade, drug abuse continues to accelerate towards becoming the most severe public health problem in the United States. The ability to detect drug­abuse risk behavior at a population scale, such as among the population of Twitter users, can help to monitor the trend of drug­abuse incidents. However, traditional methods do not effectively detect drug­abuse risk behavior in tweets, mainly due to the sparsity of such tweets and the noisy nature of tweets. In the first part of this dissertation work, the task of classifying tweets as containing drug­abuse risk behavior or not, is studied. Millions of public …

Hydrophobically Modified Isosorbide Dimethacrylates As Biomaterials For Bisphenol A Free Dental Fillings, Bilal Marie

Dissertations

Amalgam and Bisphenol A glycerolate dimethacrylate (BisGMA) are the main dental filling materials in use today. Because of the negative perception of amalgam and its lower esthetic appeal, as well as the desire to replace the endocrine disruptor Bisphenol A, which is the building block of BisGMA, there has been a critical need to search for safer alternatives to these dental filling materials.

Isosorbide is a sugar-based molecule generally recognized as safe. It has been extensively studied as a replacement to the Bisphenol A core in various materials. However, isosorbide is extremely hygroscopic, and water uptake in dental fillings causes …

Experimental And Computational Studies Of Functionalized Carbon Nanotubes For Use In Energy Storage Devices And Membranes, Emine S. Karaman

Dissertations

Electrolytes with good interfacial stability are a crucial component of any electrochemical device. The development of novel gel polymer electrolytes (GEs) with good interface stability and better manufacturability is important for the development of the next generation electrochemical devices. Gel electrolytes are hybrid electrolyte materials, combining benefits of both liquid and solid systems. Compared with liquid and solid electrolytes, GEs open new design opportunities and do not require rigorous encapsulation methods. In this dissertation, studies on functionalized carbon nanotubes (fCNTs) and graphene oxide (GO) doped polyvinyl alcohol (PVA) based gel electrolytes (GEs) are reported. The ionic conductivity and mechanical strength …

A Practical Approach To Automated Software Correctness Enhancement, Aleksandr Zakharchenko

Dissertations

To repair an incorrect program does not mean to make it correct; it only means to make it more-correct, in some sense, than it is. In the absence of a concept of relative correctness, i.e. the property of a program to be more-correct than another with respect to a specification, the discipline of program repair has resorted to various approximations of absolute (traditional) correctness, with varying degrees of success. This shortcoming is concealed by the fact that most program repair tools are tested on basic cases, whence making them absolutely correct is not clearly distinguishable from making them relatively more-correct. …

Parameter Estimation And Inference Of Spatial Autoregressive Model By Stochastic Gradient Descent, Gan Luan

Dissertations

Stochastic gradient descent (SGD) is a popular iterative method for model parameter estimation in large-scale data and online learning settings since it goes through the data in only one pass. While SGD has been well studied for independent data, its application to spatially-correlated data largely remains unexplored. This dissertation develops SGD-based parameter estimation and statistical inference algorithms for the spatial autoregressive (SAR) model, a common model for spatial lattice data.

This research contains three parts. (I) The first part concerns SGD estimation and inference for the SAR mean regression model. A new SGD algorithm based on maximum likelihood estimator (MLE) …

Developing An E-Module Of Making Edmodo-Based Hosanna Moda System Bustier To Improve Learning Independence And Learning Achievement, Lestari Rochmatun Choirunnisya', Putu Sudira

Jurnal Pendidikan Vokasi

This study aims to: 1.) Develop an Edmodo-based e-module for making Hosanna Moda system bustier to increase independence and achievement in learning custom-made clothing; 2.) Describe the feasibility of the developed e-module; and 3.) Reveal the effectiveness of the developed e-module in increasing student learning independence and learning achievement. This research is development research, which was carried out on grade XII students of Fashion, State Vocational High School 3 Magelang. The product trial consisted of a validity test by three experts, a small-scale trial involving 12 students, a large-scale trial involving 24 students, and an effectiveness test involving one control …

The Use Of Audio-Visual Media In Improving Culinary Students Learning Outcomes In Chicken Carcass Material, Mashudi Mashudi, Kokom Komariah, Moh. Farizqo Irvan

Jurnal Pendidikan Vokasi

This research aimed to find out the effectiveness of audio-visual media (picture, video, audio) on culinary students' learning outcomes in chicken carcass material. The researcher implemented a quasi-experimental method with a nonequivalent control group design. The subjects of this study were the 10th-grade students of SMK Negeri 8 Medan, Academic Year 2016/2017. Cluster random sampling was applied in this study, which consisted of one experimental class and one control class. Meanwhile, some hypothetical tests used in this study were n-gain, independent t-test, and dependent t-test. The n-gain score of learning outcomes in the experimental class is higher than the control …

Communication In The Midst Of Covid-19 Pandemic, Benni Setiawan, Pawito Pawito, Sri Hastjarjo

Informasi

No abstract provided.

Embedding Content And Language Integrated Learning (Clil) Into English For Specific Purposes Curriculum For Vocational High School, Hertati Mukadimah, Wening Sahayu

Jurnal Pendidikan Vokasi

English is agreed upon as the standard language of communication throughout the world, including Indonesia. With this, teaching and learning English should be an integral part of the national education system in Indonesia because of the importance of English globally. One of the curricula in Indonesia that focuses on teaching English for Vocational High Schools (VHS) is English for Specific Purposes (ESP), where students learn English according to their needs and fields of interest. With the existence of this ESP as well as a variety of teaching methods and approaches, there is one approach that is considered truly effective in …

Validity Of Critical Thinking Skills Instrument On Prospective Mathematics Teachers, Ayu Faradillah, Sabila Adlina

Jurnal Penelitian dan Evaluasi Pendidikan

This study aims to describe the process of validity of critical thinking skills on prospective mathematics teachers. This research used a quantitative approach with a survey method. Data were collected from 245 prospective mathematics teachers from 19 Mathematics education study programs at 19 higher education institutions in Indonesia. The data were collected using a questionnaire given via Google Form and analyzed by the Rasch Model analysis using Winstep software and Confirmatory Factor Analysis (CFA) using JASP. The results show that the instrument of critical thinking skills with indicators such as open-mindedness, inquisitiveness, systematicity, truth-seeking, analyticity, and self-confidence is valid and …

Evaluating The Learning Goal Attainment In Nihongo Noryoku Shiken N5 Course, Ai Sumirah Setiawati, Wagiran Wagiran, Subyantoro Subyantoro

Jurnal Penelitian dan Evaluasi Pendidikan

The objective of the study is to evaluate the learning implementation of the Nihongo Noryoku Shiken N5 course as a new course offered in the 2020 curriculum at the Japanese Language Education Study Program in UNNES. A goal-oriented evaluation model by Tyler was employed in the evaluation process to measure how far the learning goals that have been determined at the beginning of the lecture are achieved. This evaluative research relied on a quantitative descriptive approach; its steps comprised (1) data collection, (2) data processing and analysis, and (3) recommendation formulation. According to the evaluation results, the learning goals of …

The Commodification Of Economic Perspectives In Islamic Religious Education Studies On Social Media, Heri Fathurahman, Umasih Umasih, Gumgum Gumelar, Andy Hadiyanto, Assyifa Amelia Azzahra

Informasi

Economic empowerment in Indonesia is quite dynamically developing, this is also not free from the study of Islamic religious education on Islamic economics. Apart from this, researchers also used YouTube social media for review in this study. The formulation of the research problem is how to commodify an economic perspective in the study of Islamic religious education on social media. This study aims to analyze the commodification of economic perspectives in the study of Islamic religious education on social media. Researchers use a quantitative approach with a survey method where data will be taken from a predetermined population and sample …

Scalable Scientific Data Management On High-Performance Computing Systems, Zhenbo Qiao

Dissertations

As high-performance computing (HPC) is being scaled up to exascale to accommodate new modeling and simulation needs, I/O has continued to be a major bottleneck in the end-to-end scientific processes. To bridge the widening gap between compute and I/O, and enable data to be more efficiently stored and analyzed, simulation outputs need to be refactored, reduced, and appropriately mapped to storage tiers. Also, a major question that the community is striving to answer is how to co-design data storage and complex physics-rich analytics in a way that the time to knowledge can be minimized in post-processing. As HPC storage systems …

Hydrodynamic Characterization Of Laboratory And Production Equipment For Pharmaceutical Testing And Manufacturing Using Experimental And Computational Approaches, Chadakarn Sirasitthichoke

Dissertations

The hydrodynamics of process units used in pharmaceutical industry, i.e., the distribution of velocity profiles and shear stresses within the vessel, often controls the process performance, significantly affecting product quality. The hydrodynamics is strongly influenced by several factors such as the vessel shape, stirrer type, presence of internals and baffles, agitation intensity, and liquid properties. Most of these parameters can be varied by the process designers and the operators to achieve the desired process outcomes. The impact of the hydrodynamics on the process outcome can be profound in both large vessels (e.g., reactors) and smaller vessels (e.g., dissolution vessels), involving …

Pengembangan Lintasan Belajar Limas Untuk Mengembangkan Kemampuan Spasial Siswa Melalui Pendidikan Matematika Realistik Berbantuan Geogebra, Ulfa Meirida, Rahmah Johar, Anizar Ahmad

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Penelitian ini bertujuan untuk menghasilkan lintasan belajar pada materi limas untuk menumbuhkan kemampuan spasial siswa melalui pendidikan matematika realistik. Penelitian ini merupakan design research yang memuat tiga tahap, yaitu preparing for the experiment, the teaching experiment, dan retrospective analysis. Subjek penelitian adalah siswa kelas VIII di salah satu SMP di Aceh Besar, Indonesia. Uji coba terhadap Hypothetical Learning Trajectory (HLT) siklus 1 dilakukan secara offline dengan melibatkan tiga siswa, sementara uji coba Hypothetical Learning Trajectory (HLT) siklus 2 dilakukan secara online dengan melibatkan 10 siswa. Instrumen pengumpulan data berupa lembar aktivitas siswa, lembar observasi, pedoman wawancara, catatan …

Kesalahan Mahasiswa Semester Pertama Dalam Menyelesaikan Masalah Kecepatan Sudut Pada Mata Kuliah Trigonometri, Yayan Eryk Setiawan

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Penelitian kualitatif dengan pendekatan studi kasus ini bertujuan untuk mendeskripsikan ke­salahan mahasiswa semester pertama yang mengambil mata kuliah trigonometri dalam menye­lesaikan masalah kecepatan sudut. Tujuh mahasiswa program studi pendidikan matematika di salah satu perguruan tinggi di Kota Malang menjadi subjek penelitian. Data yang dikumpulkan dalam penelitian ini terdiri atas hasil pekerjaan subjek yang diperoleh melalui tes pemecahan masalah kecepatan sudut dan transkrip hasil wawancara dengan subjek. Analisis data hasil pe­kerjaan subjek dilakukan dengan menglasifikasikan berdasarkan jenis-jenis kesalahan. Sedang­kan analisis transkrip hasil wawancara dilakukan dengan mengodekan kata-kata yang menun­jukkan penyebab munculnya kesalahan subjek. Hasil penelitian menunjukkan bahwa kesalahan mahasiswa semester pertama …

Pengembangan Game Edukasi Matematika Berbasis Komputer Pada Materi Pola Bilangan, Angge Sapto Mubharokh, Muhammad Win Afgani, Retni Paradesa

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Penelitian ini bertujuan untuk menghasilkan game edukasi matematika berbasis komputer pada materi pola bilangan yang layak. Penelitian pengembangan ini menggunakan tahap formative evaluation yang meliputi self evaluation, expert review dan one-to-one evaluation, small group,dan field test. Kelayakan game yang dikembangkan ditinjau berdasarkan penilaian pakar dan hasil uji coba lapangan kepada siswa. Pakar yang melakukan penilaian terdiri dari dosen pendidikan matematika, staf IT, dan guru matematika. Siswa yang terlibat dalam uji coba adalah siswa kelas VIII SMP Muhammadiyah 8 Palembang. Hasil penilaian pakar menunjukkan bahwa game edukasi matematika berbasis komputer pada materi pola bilangan layak digunakan dalam …

Analisis Kemampuan Pemecahan Masalah Matematis Siswa Quitters Ditinjau Dari Kemampuan Metakognitif, Nurlaila Khasanah

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Tujuan penelitian ini adalah untuk mendeskripsikan kemampuan pemecahan masalah siswa de­ngan kategori quitter, adversity quotient (AQ) rendah, ditinjau dari kemampuan metakognitif­nya. Kemampuan pemecahan masalah yang dimaksud di sini meliputi kemampuan dalam memeriksa kecukupan unsur, mencari alternatif penyelesaian, melaksanakan penyelesaian ma­salah, dan memeriksa kebenaran jawaban. Penelitian ini merupakan penelitian deskriptif kua­litatif yang menggunakan teknik purposive sampling untuk memilih subjek penelitian. Subjek penelitian terdiri atas enam siswa kelas VIII di salah satu SMP negeri di Kota Jakarta Barat, di mana tiga siswa memiliki kemampuan metakognitif tinggi dan tiga siswa memiliki kemampuan metakognitif sedang. Data penelitian dikumpulkan dengan menggunakan angket AQ …

Perilaku Siswa Cerdas Istimewa Saat Pembelajaran Pengayaan Matematika Menggunakan Kalkulator, Cahya Mar'a Saliha Sumantri, Sugiman Sugiman, Heri Retnawati

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Penelitian ini bertujuan untuk mendeskripsikan perilaku siswa cerdas istimewa saat pem­belajaran pengayaan matematika menggunakan kalkulator. Penelitian ini merupakan penelitian deskriptif dengan pendekatan kuantitatif dan kualitatif. Subjek penelitian adalah siswa kelas VIII-A SMP Negeri di Kota Pasuruan yang terdiri dari 33 siswa. Subjek yang dipilih berasal dari kelas unggulan pada sekolah tersebut. Instrumen penelitian berupa lembar observasi dan kuesioner. Analisis data menggunakan analisis deskriptif kuantitatif dan kualitatif. Hasil penelitian mengung­kapkan bahwa siswa masih menggunakan perhitungan manual daripada menggunakan kal­kulator ketika mengerjakan tes awal. Ketika siswa mengerjakan beberapa soal pada lembar kegiatan peserta didik, siswa antusias untuk memahami petunjuk pengoperasian kalkulator, meskipun …

Mathematical Model Of Cholera Spread Based On Sir: Optimal Control, Noer Hidayati, Eminugroho Ratna Sari, Nur Hadi Waryanto

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

The bacterium Vibrio cholerae is the cause of cholera. Cholera is spread through the feces of an infected individual in a population. From a mathematical point of view, this problem can be brought into a mathematical model in the form of Susceptible-Infected-Recovered (SIR), which considers the birth rate. Because outbreaks that occur easily spread if not treated immediately, it is necessary to control the susceptible individual population by vaccination. The vaccine used is Oral Vibrio cholera. For this reason, the purposes of this study were to establish a model for the spread of cholera without vaccination, analyze the stability of …

Model Masalah Penjadwalan Transporter Pasien Dengan Pendekatan Dial-A-Ride Problem (Darp), Zahrul Jannah Nur Rochim, Irwan Endrayanto

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Transportasi intra-hospital merupakan transportasi dalam area suatu rumah sakit, termasuk di dalamnya adalah transportasi pasien. Transportasi pasien dalam area rumah sakit dilakukan oleh transporter pasien yang merupakan staf non-medis rumah sakit. Tugas transporter pasien adalah menjemput dan mengantarkan pasien yang membutuhkan bantuan untuk berpindah lokasi dalam area rumah sakit dikarenakan kondisinya yang tidak dapat berpindah sendiri untuk menjalani perawatan yang telah terjadwal. Penjadwalan transporter pasien harus mempertim­bangkan beberapa hal yang di antaranya tidak boleh terlambat dalam mengantarkan pasien se­suai jadwal perawatan, adanya time windows untuk masing-masing lokasi penjemputan dan pengantaran, masing-masing pasien memiliki batas maksimum untuk berada di perjalanan, ter­batasnya …

Analysis Of Students' Thinking Process In Solving Arithmetic Sequence Based On Adversity Quotient Types, Muhamad Sabirin, Saidah Arafah, M. Amin Paris, Muh. Fajaruddin Atsnan, Maisea Ledua Nareki

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

This descriptive qualitative study aimed at describing students' thinking process in solving arithmetic sequence problems based on students' adversity quotient (AQ). Two students who have camper type of AQ and two students who have transition from camper to climber type of AQ were involved in this study. We employed a questionnaire to identify the type of AQ that students have, a test to collect data on students' problem-solving process, and an interview guideline to clarify students' thinking process in problem-solving. The collected data were analyzed by following a process consisting of data reduction, data presentation, and drawing conclusions or verification. …

Youtube Vlog Channels In Basic Mathematics As E-Learning During The Covid-19 Pandemic, Vera Dewi Susanti, Ika Krisdiana, Wasilatul Murtafiah, Reza Kusuma Setyansah, Titin Masfingatin

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

This research aimed to produce YouTube vlog channels that are valid, practical, and effective to be used in facilitating e-learning in a basic mathematics course. The method used in this research is Research and Development (R&D), which consists of four stages, namely define, design, develop, and disseminate. The subjects in this study were 62 third-semester students of the Mathematics Education Study Program at PGRI University of Madiun, Indonesia, where 50 students were field test subjects and 12 students were limited test subjects. The instruments used in this research were a validation sheet, a student response questionnaire, and a student learning …

Online Tutoring In Pandemic: An Investigation On Students' Mathematics Anxiety And Learning Motivation, Syafika Ulfah, Khoirunnisa Khoirunnisa, Collins Bekoe

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Learning activities should be shifted from offline to online mode as a consequence of the COVID-19 pandemic. Several previous studies have stated that this situation affects the psychology of students. This study aimed to examine mathematics anxiety and learning motivation of junior high school students based on the availability of online tutoring support during the COVID-19 pandemic. We employed a survey method by distributing a Google Form link containing a questionnaire to a public junior high school in East Jakarta, Indonesia. The questionnaire consisted of 22 items of mathematics anxiety and 23 items of learning motivation with a 5-point Likert …

Analisis Efektivitas Brainly Sebagai Platform E-Learning Untuk Meningkatkan Minat Belajar Siswa Sma, Budi Murtiyasa, Alfian Nur Aulida, Mohd Asrul Affendi Bin Abdullah

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Penelitian ini bertujuan untuk mengetahui efektivitas media pembelajaran online yaitu Brainly terhadap minat belajar pada mata pelajaran matematika. Penelitian ini merupakan penilitian kuantitatif dengan menggunakan metode analisis regresi linear sederhana. Adapun sampel dalam penelitian ini berjumlah 35 responden. Pengumpulan data menggunakan kuisioner yang diberikan kepada siswa setelah penerapan Brainly sebagai media pembelajaran. Hasil penelitian menunjukkan adanya pengaruh efektivitas media pembelajaran Brainly dengan minat belajar siswa, hal ini dibuktikan dengan hasil koefisien regresi yang didapatkan bernilai positif. Sehingga dari hasil tersebut dapat disimpulkan bahwa penerapan media pembelajaran Brainly dinilai efektif dan berpengaruh terhadap minat belajar siswa.

The effectiveness of Brainly as …

Penggunaan Contoh Dalam Pembelajaran Matematika Sekolah Menengah Dalam Persepsi Guru, Fitria Maharani, Puji Yanti Fauziah, Muhamad Ikhsan Sahal Guntur

PYTHAGORAS : Jurnal Matematika dan Pendidikan Matematika

Pemberian contoh dalam pembelajaran matematika adalah sesuatu hal yang wajar dilakukan oleh guru di dalam kelas, tetapi yang menjadi perhatian menarik adalah bagaimana persepsi guru yang mengunakan contoh dalam pembelajaran matematika ditengah semangat kontruksivisme yang dituntut dalam kurikulum 2013 di Indonesia. Penelitian ini bertujuan menggambarkan pertimbangan apa saja yang digunakan guru dalam pemilihan contoh dan kendala apa yang dialami guru ketika memilih contoh tersebut. Metode penelitian yang digunakan adalah metode penelitian kualitatif studi kasus. Data kemudian dianalisis untuk menentukan tema dan melihat keterkaitan antar tema. Subyek penelitian ini adalah 22 guru yang menggunakan contoh soal dalam pembelajaran di kelas. Hasil …