bluuebunny/crossref_metadata_2025_split huggingface dataset:
IMPACT OF IMPUTATION ON CLUSTER-BASED COLLABORATIVE FILTERING APPROACH FOR RECOMMENDATION SYSTEM
Authors: Ifada Noor 
Published: November 2019

The Collaborative Filtering (CF) widely used in Recommendation System commonly suffers the sparsity issue since the unobserved rating entries usually over dominance the observed ones. A clustering technique is an alternative solution that can solve the problem. However, no in-depth work has investigated how the missing entries should be mitigated and how the cluster-based approach can be implemented. In this study, we show how the imputed cluster-based approach deals with the missing entries, improving the recommendation quality. The framework of our method consists of four main stages: rating imputation to replace the missing entries, K-means clustering to group users or items based on the imputed rating data, CF-based prediction model, and generating the list of top-N recommendation. This paper uses three variations of imputation techniques, i.e., null, mean, and mode. The cluster-based approach is employedby using the K-Means as the clustering technique, and either the user-based or the items-based model as the CF approach. Experiment results show that the null imputation technique gives the best results when dealing with the missing entries. This finding indicates that the implementation of the clustering techniqueis sufficient for solving the sparsity issue such that imputing the missing entries is not necessary. We also show that our imputed cluster-based CF methods always outperform the traditional CF methods in terms of the F1-Score metric.
Demonstrasi Plot Pemeliharaan Ayam Ras Petelur Sebagai Rintisan Terbentuknya Kampung Unggas di Desa Rempek Kabupaten Lombok Utara
Authors: Tamzil Mohammad Hasil , Indarsih Budi , Pardi Pardi , Yanuarianto Oscar 
Published: November 2019

The program of demonstration plot in Rempek Village, North Lombok Regency was expected to become a pioneer for laying chicken farm in the regency. Prior to development of planned facilities, site survey was conducted to find the purposed location and focus discussion group. The demonstration plot used house system with 6 x 20 m in width and length extending from east to west. The cage was built using mild construction iron poles and roofed using spandex. The roof was in a monitor-shape with half–open walls on the north and south sides. 550 cages were put iniside the house to keep 1100 pullets. For the pullet row put next to the walls, they were placed with the heads facing inwards; meanwhile for the pullets in the middle rows, they were placed back to back with each other. Every cage was equipped with a feeder and a nipple. During the rearing process, the pullets were fed 110 g/head/day of a mixture of commercial concentrate, corn, and bran with the ratio of 2:4:4, while drinking water was given ad libitum. The production process was normal with egg production peak reaching 92%. After 4 weeks of the peak production, North Lombok Regency was hit by several earthquake, causing the decrease of egg production for the feed was too procey for the production to continue
Pengaruh Model Kooperatif Tipe Teams Games Tournament Dengan Menggunakan Media Permainan Monopoli Terhadap Hasil Belajar Siswa Pada Materi Pencemaran Lingkungan di SMA Muhammadiyah 18 Sunggal
Authors: Azmi Khairani , Azwar Edi 
Published: November 2019

Penelitian ini bertujuan untuk mengetahui Pengaruh Model Kooperatif Tipe Teams Games Tournament Dengan Menggunakan Media Permainan Monopoli Terhadap Hasil Belajar Siswa Pada Materi Pencemaran Lingkungan Di SMA Muhammadiyah 18 Sunggal. Penelitian ini dilaksanakan pada bulan Maret – Juni 2017. Penelitian ini menggunakan Metode Eksperimen Semu (Quasi experiment) dengan populasi penelitian adalah seluruh siswa di kelas X SMA Muhammadiyah 18 Sunggal Tahun Pembelajaran 2016/2017 yang berjumlah 106 siswa yang kemudian dijadikan sampel sebanyak 35 siswa dari kelas X-2 dengan pengambilan sampel secara acak (Random Sampling). Data yang dianalisis dalam penelitian ini adalah berupa test yaitu pre test dan post test pada materi Pencemaran Lingkungan..Nilai rata-rata pre test sebelum diterapkan model kooperatif tipe Teams Games Tournament dengan menggunakan media permainan monopoli adalah 45,00 dan standart deviasi 11,79 seluruh siswa dinyatakan tidak tuntas (100%). Dan nilai rata-rata post test yang diperoleh setelah model diterapkan adalah 75,80 dan standart deviasi 12,33. Berdasarkan nilai KKM 75,00 sebanyak 20 siswa (57%) yang tuntas dan 15 siswa (43%) tidak tuntas. Berdasarkan uji hipotesis didapat nilai thitung = 11,22 sedangkan nilai ttabel = 1,69 sehingga thitung> ttabel, dengan demikian Ha diterima dan H0 ditolak, dan dapat disimpulkan bahwa ada pengaruh yang signifikan penggunaan Model Kooperatif Tipe Teams Games Tournament Dengan Menggunakan Media Permainan Monopoli Terhadap Hasil Belajar Siswa Pada Materi Pencemaran Lingkungan Di Kelas X SMA Muhammadiyah 18 Sunggal
Development of Biopesticide Bauveria bassiana Bals. (Vuill.) Fungi For Pest Control Vegetable in Berastagi
Authors: Sularno Sularno 
Published: November 2019

This research was conducted in two stages. The research method is the isolation and application of biopesticide. In the first stage aims to isolate entomopathogenic fungi Beauveria bassiana around Berastagi vegetable farms and grow on agar and corn mashed artificial medium. Testing the virulence of Beauveria bassiana in vitro in several types of vegetable pests before it is applied on agricultural land. In phase II aims to application B. bassiana in the vegetable patch. In the in vitro treatment, the ability to infect insects beauvria average reached 75%. , Controls on crop lands, in the third week began their Crocidolomia pests that attack the growing point so that the cabbage plants fail to bloom. Average cropland applied biopesticides B. bassiana has been no attack. At week 7 attacks on control plants reach 13 plants or 17.3%. In field applied while Beauveria bassiana attack reached six plants, or about 8%.
Studi Mengenai Strategi Pemasaran Makanan Tradisional “Panggelong” dan Kandungan Gizi Yang Terkandung di Dalamnya Menggunakan Konsep “Marketing Mix”
Authors: Hutasuhut Julianto 
Published: November 2019

Memahami nilai edukasi dari strategi dan proses pemasaran makanan dapat dilihat dan diutamakan dari segi kandungan gizi dan teknik yang berkaitan dengan nilai Edukasi yang terkandung didalamnya. Pemberdayaan ekonomi merupakan sebuah kegitan yang sangat potensial untuk meningkatkan taraf hidup dan kesejahteraan masyarakat. Upaya ini dapat dilakukan melalui penguatan usaha mikro dan kecil (UMK) karena secara empiris kontribusinya dapat berpengaruh langsung memperluas kesempatan kerja dan memperkuat daya beli masyarakat. Industri makanan panggelong di Kecamatan Sipirok merupakan jenis usaha yang masih berskala mikro namun mempunyai potensi pasar yang menjanjikan. Kondisi pasar dan trend permintaan terhadap produk tersebut terus meningkat, namun peluang bisnis ini belum dapat dimanfaatkan secara maksimal. Pengelolaan usaha dan saluran pemasaran masih bersifat konvensional yaitu masih mengandalkan tenaga manusia, peralatan yang sederhana dan dikelola dengan ilmu pengetahuan yang seadanya. Untuk membantu para mitra agar usahanya lebih maju tim pengabdi merasa terpanggil untuk ikut berpartisipasi menjelaskan kepada mereka tentang bagaimana mengelola bisnis secara modern yaitu dengan memahamkan strategi pemasaran dengan konsep “Marketing Mix”.Secara implisit pengusaha bersedia dan kooperatif menerima materi yang disampaikan. Target yang diharapkan dari pengabdian ini adalah bisnis panggelong yang digeluti kedua mitra dapat semakin maju dan meningkatkan kontribusinya dalm menguatkan peekonomian masyarakat Sipirok melalui strategi pemasaran Marketing Mix (Bauran Pemasaran).
Potensi Radikal-Terorisme dalam Paham Teologi Salafiyah: Studi Kasus terhadap Yayasan Minhaj As-Sunnah Medan, Sumatera Utara
Authors: Adenan Adenan , Matondang Husnel Anwar 
Published: November 2019

Artikel ini bertujuan untuk menjawab kecurigaan sebagian anggota masyarakat terhadap Salafiyah secara umum. Salah satu yayasan berfahan salafi, yaitu Yayasan Minhaj as-Sunnah, dijadikan sebagai objek penelitian. Fokus masalahnya adalah apa yang melatarbelakangi Yayasan Minhaj As-Sunnah menjadikan Salafiyah sebagai dasar teologis keagamaannya dihubungkan dengan pemahaman radikalisme-terorisme. Hasil temuan dari penelitian ini adalah Manhaj Salafiyah menggunakan metodologi penafsiran teks Al-Quran dan Sunnah yang disusun para salaf untuk membentengi Islam dari penafsiran-penafsiran keliru dan menyesatkan yang didasari oleh kepentingan hawa nafsu. Yayasan Minhaj As-Sunnah memahami bahwa Manhaj Salafiyah tidak memiliki hubungan dengan gerakan dan pemahaman radikal-terorisme.Kata kunci: Salafiyah, Minhaj As-Sunnah, radikalisme, terorisme.
Strategi Komunikasi dalam Resolusi Konflik Umat Beragama di Kota Tanjung Balai
Authors: Hasibuan Sahdin 
Published: November 2019

Artikel ini bertujuan membahas strategi komunikasi dalam resolusi konflik umat beragama di Kota Tanjung Balai, berbagai macam kegiatan komunikasi dalam meredam konflik keagamaan telah dilakukan oleh pihak-pihak yang terkait. Dengan melihat berbagai macam keadaan yang ada mengenai kehidupan sosial masyarakat pada Kota Tanjung Balai, komunikasi dalam dialog keberagaman dilakukan oleh para pihak pemuka agama dari lintas keagamaan. Penelitian ini mengandalkan metode studi lapangan (field research) dan studi pustaka (library research). Penelitian ini dilakukan di Kota Tanjung Balai dengan mengunjungi beberapa lembaga keagamaan yang terkait serta instansi pemerintahan, dan masyarakat sekitar yang berada pada saat kejadian. Adapun yang dapat diperoleh dari data hasil penelitian antara lain: 1) Upaya peningkatan kesejahteraan sosial melalui bidang ekonomi; 2) Dialog dan komunikasi oleh Forum Kerukunan Umat Beragama (FKUB); 3) Pemerintah, Departemen Agama, dan Pihak MUI yang berupaya untuk berkomunikasi dengan pihak yang terlibat melalui dialog lintas keagamaan.Kata kunci: Strategi komunikasi, resolusi konflik, Tanjung Balai.
Pemberdayaan Masyarakat Berbasis Alumni PTKI: Analisis Alumni Prodi Pengembangan Masyarakat Islam UINSU di Kabupaten Langkat, Sumatera Utara
Authors: Deni Indira Fatra , Salamuddin Salamuddin 
Published: November 2019

Tulisan ini ingin melihat bagaimana kampus sebagai miniatur negara bagi mahasiswa yang menyiapkan kader terbaiknya sebagai penawar sedingin bagi masyarakat. Alumni sebagai agen perubahan yang selayaknya mampu menjadi tauladan di tengah kehidupan masyarakat. Tulisan ini bertujuan untuk mendeskripsikan atau memberikan gambaran perilaku alumni sebagai motor penggerak perubahan kebaikan di kalangan masyarakat. Salah satu yang dilakukan alumni sebagai aktor perubah dengan melakukan pendekatan konsultatif secara face to face communication, dan edukatif. Yang menjadi tantangan bagi para alumni dalam melakukan perubahan mental bagi masyarakat yaitu lembaga alumni yang sangat minim menjadikan mereka sulit untuk berkoordinasi satu sama lainnya, pemanfaatan fasilitas baik itu penggunaan teknologi sebagai pendukung kegiatan alumni yang belum dimanfaatkan secara maksimal.Kata Kunci: Alumni, kampus dan pembangunan spritual masyarakat.
RESIDUAL STRESS DISTRIBUTION DURING WELDING UNDER CONDITIONS OF LOW CLIMATIC TEERATURES
Authors: Сараев Юрий , Saraev Yuriy , Голиков Николай , Golikov Nikolay , Сидоров Михаил , Sidorov Mihail 
Published: November 2019

The investigation of residual welding stresses is extremely essential for the choice of efficient structural forms of designed welded structures and for the correct choice of technological welding methods for manufacturing welded structures. In spite of the substantial data amount obtained as a result of the investigations carried out earlier the distributions of residual stresses and their impact upon working capacity of welded joints carried out during welding under conditions of low climatic temperatures is studied insufficiently. Actually there are no works on experimental investigations of residual stresses of welding under cold climatic conditions.
The purpose of the work consists in the investigation of the character of residual stress distribution in end welded joints of structural steel St3sp after welding under low climatic temperature conditions by power sources with pulse and constant parameter measurements.
To investigate residual stresses there was carried out plate welding at room and negative air temperatures. There were chosen and carried out two welding modes: pulse-arc welding with modulated current with the frequency of 1.67Hz and direct current welding. The definition of residual stresses was carried out with the use of X-ray method based on the measurement of material lattice micro-deformations caused by their effect.
On the basis of the investigation results it was revealed that a welding temperature affects a value and a character of weld stresses. At air temperature decrease up to -45ºC irrespective of the welding mode chosen the increase of a tensile residual welding stress level in welded joints by 40…50% is observed. In comparison with dc welding during welding with modulated current there are formed residual stresses with a lower level of mean values both at room (+20ºC) temperature, and at negative one (-45ºC). The increase of a tensile residual stress level during welding under cold air conditions is connected with the necessity to increase the rate of energy input at welding, and also with the increase of steel strength properties at temperature decrease.
INHERITANCE MECHANISM REALIZATION DURING ELECTRONIC DEVELOPMENT OF EDUCATIONAL PROGRAMS
Authors: Сергеев Алексей , Sergeev Aleksey 
Published: November 2019

The article describes the implementation of the mechanism of inheritance of educational programs in the process of electronic development of educational documentation of the university. The purpose of the inheritance mechanism is to improve the processes of automated development of educational programmes and to ensure internal consistency of educational documentation.
In the course of the study, the concept of inheritance of educational programs was introduced as a mechanism to take into account the information of parental educational programs when describing the elements of subsidiary programs corresponding to this information. The possibilities of applying the inheritance mechanism in situations: 1) preparation of documentation of similar programs implemented on different forms of training are disclosed; 2) creation of different versions of documentation of educational programs, depending on the year of reception; 3) creating one child program based on several parents; 4) multiple inheritance of a series of related educational programs. Functional requirements for the educational program development tool system are described for each of the above situations. Actual data on the impact of the inheritance mechanism in the development of educational programmes are presented.
Thus, the inheritance of educational programs is an effective mechanism for developing educational documentation in an electronic environment. This mechanism significantly reduces the cost of developing similar programs, as well as improving the quality of the university 's educational documentation by improving the consistency of its parts.
Using machine learning to predict 30-day readmissions after posterior lumbar fusion: an NSQIP study involving 23,264 patients
Authors: Hopkins Benjamin S. , Yamaguchi Jonathan T. , Garcia Roxanna , Kesavabhotla Kartik , Weiss Hannah , Hsu Wellington K. , Smith Zachary A. , Dahdaleh Nader S. 
Published: November 2019

OBJECTIVEUnplanned preventable hospital readmissions within 30 days are a great burden to patients and the healthcare system. With an estimated $41.3 billion spent yearly, reducing such readmission rates is of the utmost importance. With the widespread adoption of big data and machine learning, clinicians can use these analytical tools to understand these complex relationships and find predictive factors that can be generalized to future patients. The object of this study was to assess the efficacy of a machine learning algorithm in the prediction of 30-day hospital readmission after posterior spinal fusion surgery.METHODSThe authors analyzed the distribution of National Surgical Quality Improvement Program (NSQIP) posterior lumbar fusions from 2011 to 2016 by using machine learning techniques to create a model predictive of hospital readmissions. A deep neural network was trained using 177 unique input variables. The model was trained and tested using cross-validation, in which the data were randomly partitioned into training (n = 17,448 [75%]) and testing (n = 5816 [25%]) data sets. In training, the 17,448 training cases were fed through a series of 7 layers, each with varying degrees of forward and backward communicating nodes (neurons).RESULTSMean and median positive predictive values were 78.5% and 78.0%, respectively. Mean and median negative predictive values were both 97%, respectively. Mean and median areas under the curve for the model were 0.812 and 0.810, respectively. The five most heavily weighted inputs were (in order of importance) return to the operating room, septic shock, superficial surgical site infection, sepsis, and being on a ventilator for > 48 hours.CONCLUSIONSMachine learning and artificial intelligence are powerful tools with the ability to improve understanding of predictive metrics in clinical spine surgery. The authors’ model was able to predict those patients who would not require readmission. Similarly, the majority of predicted readmissions (up to 60%) were predicted by the model while retaining a 0% false-positive rate. Such findings suggest a possible need for reevaluation of the current Hospital Readmissions Reduction Program penalties in spine surgery.
Asymptotic expansion for the optimal cost of an ill-posed problem with singular perturbations
Authors: Bertrand Pierre 
Published: November 2019

We give the development of jε: the optimal cost of the nonlinear problem with singular perturbations with state equation −εz″(t)−f(z(t))=υ and z(0)=z(T)=0 and with cost Jε(υ,z)= $\frac{1}{2r}$ ‖z−zd‖2rL2r(0,T)+½N‖υ‖2L2(0,T). We make a formal expansion of the optimality system. In the case without constraints, we introduce boundary layer terms to approximate it to order 0(εk) for any k>0. We show that the boundary layer terms decay exponentially. We deduce, from the approximate optimality system, the expansion of jε, to order O(ε2k) and the associated control.
Diffusion approximation of the linear semiconductor Boltzmann equation: analysis of boundary layers
Authors: Poupaud F. 
Published: November 2019

This paper deals with mathematical properties of the semiconductor Boltzmann equation. We first investigate the question of existence of solutions and some basic properties of the collision operator. Then we study the connection with the drift diffusion model by using a perturbation approach, the so-called diffusion approximation. For justifying rigorously this theory, we have to deal with boundary layers. A half space problem (Milne problem) arises in the study of the boundary corrector. We prove existence and we give the asymptotic behaviour of its solutions.
Spectral asymptotics for Hill's equation near the potential maximum
Authors: März Christoph 
Published: November 2019

We study the spectrum of a one-dimensional semiclassical periodic Schrödinger operator near the potential maximum. The potential is supposed to be analytic and to have only one point of maximum over the period, which in addition is assumed to be non-degenerate. The spectrum is the union of bands, and some energy value is belonging to the spectrum, if and only if the trace of the operator of translation by the period acting on the two-dimensional space of solutions of the corresponding stationary Schrödinger equation lies in [−2,2]. By application of a result by Helffer and Sjöstrand we can take the dilation generator as a model near the potential maximum, and by application of a Fourier integral operator we find local solutions that have a standard WKB-form away from the point of maximum. So we may extend them over the whole period in order to compute the asymptotics of the trace of the translation matrix such that we finally obtain the size of the bands and the gaps separating them.
Correctors results for relaxed Dirichlet problems
Authors: Finzi Vita Stefano , Tchou Nicoletta Anna 
Published: November 2019

We consider the asymptotic behaviour of the solutions of a sequence of elliptic problems with homogeneous Dirichlet boundary conditions, involving singular potentials which can be Borel measures with infinite values. Problems of this kind, introduced in (Dal Maso and Mosco, 1986) and (Dal Maso and Mosco, 1987) are called ‘relaxed Dirichlet problems’ since they form the smallest family of equations, stable under the convergence of solutions in L2, which includes Dirichlet problems with zero boundary conditions on many small holes (see also (Cionarescu and Murat, 1982) and (Dal Maso, 1987)). After extraction of a subsequence, the solutions converge weakly in H10(Ω) to the solution of a limit problem of the same type. We determine a corrector, i.e. an explicit expression constructed from the limit of the solutions and from some generalized capacitary potentials, the difference of which with the solution tends strongly to zero in H10(Ω). Under suitable regularity assumptions on the limit problem, we are able to prove a strong convergence results and an abstract error estimate. Moreover, we prove in the general case that there is no need of correctors in the singular set of the measure of the limit problem.
Critical points of the Ginzburg–Landau system on a Riemannian surface
Authors: Baraket Sami 
Published: November 2019

We study here the Ginzburg-Landau functional on a Riemannian surface S endowed with an arbitrary metric Eε(u)=½∫𝒮||∇u||2+1/(4ε2)∫𝒮(|u|2−1)2, u∈H1(S,C), where ε∈]0,+∞[. We study the asymptotic behaviour of the critical points for Eε as ε→0. We define a renormalized energy which allows to characterize the position of the singularities at the limit.
PENGARUH STRATEGI HARGA DAN KUALITAS PELAYANAN TERHADAP KEPUTUSAN PEMBELIAN TIKET MASKAPAI PENERBANGAN CITILINK DI BANDARA SOETA JAKARTA
Authors: Harras Hadyati 
Published: November 2019

ABSTRAKTujuan daripenelitian ini adalah untukmengetahui pengaruh strategi harga dan kualitas pelayanan terhadap keputusan pembelian tiket maskapai penerbangan Citilink di Bandara Soeta Jakarta.Desain penelitianyang digunakandalam penyusunan penelitian ini adalah kuantitatifasosiatif kausal dengan eksplanasi (penjelasan) deskriptif. Adapun metode analisis yang digunakan adalah analisis regresi linear berganda dengan sampel sebanyak 98 dan teknik sampling yang digunakan adalah teknik Accidental Sampling.Hasiluji hipotesis berdasarkan pengujian regresi linear menunjukkan bahwaharga terbukti berpengaruh positif dan signifikan terhadap keputusan pembelian sebesar 0.510 dan t hitung 5.484. Sedangkan kualitas pelayanan berpengaruh positif dan signifikan terhadap keputusan pembelian sebesar 0.258 dan t hitung 2.768. Hasil analisis regresi membuktikan terdapat pengaruh secara simultan variabel strategi harga dan kualitas pelayanan secara bersama-sama terbukti berpengaruh positif dan signifikan terhadap keputusan pembelian dengan kontribusi sebesar 47,7%sedangkan sisanya sebesar 52,3% dijelaskan oleh variabel lain di luar penelitian ini. Kata Kunci : Strategi Harga, Kualitas Pelayanan, Keputusan Pembelian.