Articles

ANALISIS PENGARUH STATUS BEKERJA TERHADAP JENIS KELAMIN DAN UMUR DENGAN PENDEKATAN BINARY LOGISTIC REGRESSION Rizal, Syamsul; Nisa, Imaroh Izzatun; Darsyah, Moh. Yamin
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2017: Prosiding Seminar Nasional Pendidikan, Sains dan Teknologi
Publisher : Universitas Muhammadiyah Semarang

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One of method of Data Analysis Category used to determine the effect of the relationship with the response variable of type nominal is using Binary LogisticRegression (BLR) approach. BLR is used for data whose response variable isdata consisting of two categories, with one predictor variable or more, bothcategorical and continuous. In determining the degree of workforce inIndonesia, one indicator that can be used is the status of working. Status workdefined into two, namely the status is still working and the status does not work.Variabel used in this study is the working status ( Y) as the response variablewith category 1 is still working, category 0 does not work, while the predictorvariables are education level (X1) and gender (X2). There are 2 variables thataffect the model of education variables (X1) and age (X2). The accuracyclassification is 87%. Keywords: Working Status, BLR,Classification
PENGEMBANGAN MODUL MATEMATIKA DISKRIT BERBANTUAN SOFTWARE WXMAXIMA Dewi, Shinta; Rizal, Syamsul; Johar, Rahmah
Jurnal Peluang Vol 7, No 2 (2019): Jurnal Peluang
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jp.v7i2.13747

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The study was motivated by the problems faced by students of Mathematics Education of Aceh Muhammadiyah University. Students had difficulty studying discrete mathematics course. Based on preliminary observations, the problem that often arised was when graphing, especially for more complex issues that require longer time for manually drawing. Besides, the availability of discrete mathematics module is limited, especially the one using software maxima for solving problems. Therefore, it is necessary to develop discrete module mathematics assisted by wxMaxima software. Discrete Mathematics Module Development Research wxMaxima assisted by software aims to produce the ICT-based discrete mathematics modules that are valid and practical. The method used was research development. The model used was the Plomp model development, involving (1) the initial investigation phase, (2) the design phase, (3) the realization phase/construction, and (4) the phase of the test, evaluation and revision. The results showed that the development of discrete mathematics module assisted with wxmaxima software was valid, as indicated by the validation results that showed a valid criterion. Discrete mathematics modules developed was practical, as seen from the results of the field trials in the Department of Mathematics, University of Muhammadiyah Tarbiyah Aceh, where the average student activities showed good criterion.
TEA LEAVES GMB SERIES CLASIFFICATION USING CONVOLUTIONAL NEURAL NETWORK Rizal, Syamsul; Pratiwi, Nor Kumalasari Caecar; Ibrahim, Nur; Vidya, Hurianti; Saidah, Sofia; Fu'adah, R Yunendah Nur
JESCE (JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING) Vol 3, No 2 (2020): Journal Of Electrical And System Control Engineering Februari
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jesce.v3i2.3320

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This study classifies GMB series tea leaves by using a convolutional neural network as a classification system. GMB series tea are the superior tea seeds in Indonesia. Gambung series, namely: GMB 1 to GMB 11, are planting material seeds that have been recommended by the Ministry of Agriculture. The potential of these tea series yield of 4,000 - 5,800 kg / ha of dried tea. The morphological similarity level of GMB 1 to GMB 11 is very high, because many elders from the clones are from the same crossing parents. During this time, the process of identifying GMB clones 1 through GMB 11 is done manually using the visual eye of an experts at PPTK Gambung. These experts are limited to be able to identify each tea series. This process is susceptible to errors in the reading of clone types, and is very dependent on the presence of the experts. If an error occurs in the process of identifying the type of clone, it will interfere with the nursery process. Errors in the selection of recommended clones will harm the process of a long period of time, because the economic age of tea plants can reach until 50 years. The potential loss of production due to misuse of plant material can reach 1,200 kg / ha per year. Against the background of these problems, it is very necessary to have a system to identify the GMB series clone. Continuous studies has been conducted to build an automation system for the identification and classification of GMB series tea clones. The system is designed using the Convolutional Neural Network (CNN) method. The results obtained from this system output in the form of accuracy with a value of 85%.
SINTESIS DAN UJI TOKSISITAS SENYAWA METOKSI FLAVANON TURUNAN 2’-HIDROKSIKALKON Rizal, Syamsul; Zamri, Adel
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Flavanone is one of secondary metabolities included into flavonoid group that has biological activities such as anticancer, antitumor, antiproliferative, and antimicrobe. Moreover, flavanone is the biosynthesis main precursor for other types of flavonoids. In this research, 4’-methoxyflavanone has been synthesized from cyclization of 2’-hydroxychalcones derivatives by microwave irradiation using sodium acetate in ethanoland water as a catalyst. The yield obtained was 68,5 %. The purity of compound has been tested using TLC, melting point test, and HPLC. The compound was characterized by UV, IR,1 H-NMR, and MS. Toxicity activity was determined using Brine Shrimp Lethality Test (BSLT) against larvae of Arthemia salina Leach and with value LC50 = 3,29 µg/ mL. Accordings to the primary test, the flavanone compound is potentially as anticancer which was proven by LC 50 values <200 μg/mL.
SIMULATION OF SEA SURFACE TEMPERATURE (SST) AND SEA SURFACE SALINITY (SSS) IN THE BAY OF BENGAL Rizal, Syamsul; Muhammad, .; Iskandar, Taufiq; Setiawan, Ichsan; Satriadi,, Agus; Radinal, .
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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The simulation of Bay of Bengal (included Andaman Sea) has been done. This investigation used equation of motion (Navier-Stokes equation).  The equation of motion was solved by means of Hamburg Shelf Ocean Model (HAMSOM). The analysis is done for the year of 2007. The National Centers for Environmental Prediction (NCEP) data for year of 2007 is used to force the Bay of Bengal.  The sea surface temperature (SST) and sea surface salinity (SSS) have been obtained and analyzed. The highest SST occurs in April 2007, while the lowest SST occurs in October 2007. The pattern of SST depends on the wind vector. From January untill June 2007, the SSS pattern is a west-east pattern. The SSS value is lower in the east and higher in the west. From July untill December, the higher value of SSS is generally in the middle of the Bay of Bengal. Generally, the value of SSS is higher in July and August, while in December and January the value of SSS is lower. Some results have been compared and consistent with the study of Vinayachandran dan Kurian (2008) and Vinayachandran and Yamagata (1998).
SHALLOW WATER EQUATION SOLUTION IN 2D USING FINITE DIFFERENCE METHOD WITH EXPLICIT SCHEME Nuraini, Nuraini; Rizal, Syamsul; Marwan, Marwan
Jurnal Natural Volume 17, Number 2, September 2017
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v17i2.7997

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Abstract. Modeling the dynamics of seawater typically uses a shallow water model. The shallow water model is derived from the mass conservation equation and the momentum set into shallow water equations. A two-dimensional shallow water equation alongside the model that is integrated with depth is described in numerical form. This equation can be solved by finite different methods either explicitly or implicitly. In this modeling, the two dimensional shallow water equations are described in discrete form using explicit schemes.Keyword: shallow water equation, finite difference and schema explisit.REFERENSI 1. Bunya, S., Westerink, J. J. dan Yoshimura. 2005. Discontinuous Boundary Implementation for the Shallow Water Equations. Int. J. Numer. Meth. Fluids. 47: 1451-1468.2. Kampf Jochen. 2009. Ocean Modelling For Beginners. Springer Heidelberg Dordrecht. London New York.3. Rezolla, L 2011. Numerical Methods for the Solution of Partial Diferential Equations. Trieste. International Schoolfor Advanced Studies.4. Natakussumah, K. D., Kusuma, S. B. M., Darmawan, H., Adityawan, B. M. Dan  Farid, M. 2007. Pemodelan Hubungan Hujan dan Aliran Permukaan pada Suatu DAS  dengan Metode Beda Hingga. ITB Sain dan Tek. 39: 97-123.5. Casulli, V. dan Walters, A. R. 2000. An unstructured grid, three-dimensional model based on the shallow water equations. Int. J. Numer. Meth. Fluids. 32: 331-348.6. Triatmodjo, B. 2002. Metode Numerik  Beta Offset. Yogyakarta.
SEMI-IMPLICIT NUMERICAL SCHEMA IN SHALLOW WATER EQUATION safwandi, safwandi; Rizal, Syamsul; Tarmizi, Tarmizi
Jurnal Natural Volume 17, Number 2, September 2017
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v17i2.7998

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Abstract. A two-dimensional shallow water equation integrated on depth water based on finite differential methods. Numerical solutions with different methods consist of explicit, implicit and semi-implicit schemes. Different methods of shallow water equations expressed in numerical schemes. For bottom-friction is described in semi-implicitly. This scheme will be more flexible for initial values and boundary conditions when compared to the explicit schemes.  Keywords: 2D numerical models, shallow water equations, explicit and semi-implicit schema.Reference Hassan, H. S., Ramadan, K. T., Hanna, S. N. 2010. Numerical Solution of the Rotating Shallow Water Flows with Topography Using the Fractional Steps Method, Scie.Res,App.Math. (1):104-117. Omer, S, Kursat, K. 2011. High-Order Accurate Spectral Difference Method For Shallow Water Equations. IJRRAS6. Vol. 6. No. 1. Kampf, J. 2009. Ocean Modelling for Beginners. Springer Heidelberg Dordrecht. London, New York. Wang, Z. L., Geng, Y. F. 2013. Two-Dimensional Shallow Water Equations with Porosity and Their Numerical scheme on Unstructured Grids. J. Water Science and Engineering. Vol. 6, No. 1, 91-105. Saiduzzaman, Sobuj. 2013. Comparison of Numerical Schemes for Shallow Water Equation. Global J. of Sci. Fron. Res. Math. and Dec. Sci. Vol. 13 (4). Sari, C. I., Surbakti, H., Fauziyah., Pola Sebaran Salinatas dengan Model Numerik Dua Dimensi di Muara Sungai Musi. Maspari J. Vol. 5 (2): 104-110. Bunya, B., Westerink, J. J. dan Shinobu, Y. 2004. Discontinuous Boundary Implementation for the Shallow Water Equations. Int. J. Numer. Meth. Fluids 2005 (47): 1451?1468. 
ANALISA PENGARUH PERUBAHAN KETEBALAN PEMAKANAN, KECEPATAN PUTAR PADA MESIN, KECEPATAN PEMAKANAN (FEEDING) FRAIS HORISONTAL TERHADAP KEKASARAN PERMUKAAN LOGAM Seprianto, Dicky; Rizal, Syamsul
AUSTENIT Vol 1, No 01 (2009): AUSTENIT 01012009
Publisher : AUSTENIT

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Proses pengefraisan adalah suatu proses pengurangan material untuk membentuk suatu produk dengan cara pahat (cutter) berputar dan tiap giginya melakukan pemakanan serta meja mesin bergerak ke kiri atau kanan sehingga benda bergerak mengikuti gerakan meja, akibatnya terjadilah penyayatan atau pemotongan oleh pahat. Dalam proses ini terdapat pengaruh terhadap hasil nilai kekasaran permukaan akibat dari penyayatan itu. Untuk mendapat nilai kekasaran permukaan maksimum yang dapat dilakukan oleh mesin frais sangatlah sulit dan untuk itu sering kali dilakukan pekerjaan tambahan untuk mendapatkan kekasaran permukaan tertentu yaitu dengan cara pengerindaan, dan hal ini mengakibatkan peningkatan biaya produksi, serta memperpanjang waktu produksi. Dilapangan ada 2 metode pengefraisan yang dapat dilakukan yaitu dengan cara vertikal dan horisontal akan tetapi yang paling banyak dilakukan adalah pengefraisan vertikal. Selain itu pada proses frais ini bahan yang akan dilakukan proses permesinan akan mempengaruhi kecepatan mesin dan pemakanan yang dilakukan oleh pahat pada tiap giginya. Dari hasil penelitian ini maka kehalusan permukaan benda uji yang telah difrais untuk semua bahan yang digunakan pada pengujian dengan menggunakan cutter High Speed Steel (HSS) termasuk ke dalam katagori nilai kekasaran permukaan yang ada pada standard. Nilai kekasaran yang dapat dicapai adalah antara N6 sampai dengan N8 yang mempunyai nilai 0,8 ?mm sampai dengan 0,20 ?mm.
MEKANISASI PEMOTONGAN TEMPE UNTUK KERIPIK MENGGUNAKAN PISAU ROTASI Romli, Romli; Rizal, Syamsul; Widagdo, tri
AUSTENIT Vol 3, No 02 (2011): AUSTENIT 03022011
Publisher : AUSTENIT

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Penelitian ini dilatarbelakangi oleh pentingnya peningkatan gizi masyarakat. Metode yang dikembangkan adalah kaji eksperimentalpada sebuah prototipe mesin pemotong tempe yang bekerja menggunakan pisau rotasi. Tujuan penelitian adalah mendapatkan data-data pengoperasian mesin, sedangkan manfaatnya adalah memberikan rekomendasi untuk pengoperasian mesin pada kondisi optimum. Variabel-variabel yang ditetapkan pada proses pemotongan tempe adalah jenis tempe bulat, putaran pisau potong n = 2850 rpm, sedang variabel bebasnya adalah tebal potongan (s) serta waktu pemotongan (t). Kondisi Optimum kinerja mesin untuk 4 variasi ketebalan adalah: - Ketebalan 0,2 mm, waktu pemotongan 3 detik dengan pemakaian daya listrik 94 Watt dengan kualitas pemotongan sedang. - Ketebalan 0,4 mm, waktu pemotongan 3 detik dengan pemakaian daya listrik 100 Watt dengan kualitas pemotongan sedang. - Ketebalan 0,6 mm, waktu pemotongan 2 detik dengan pemakaian daya listrik 114 Watt dengan kualitas pemotongan bagus. - Ketebalan 0,8 mm, waktu pemotongan 2,5 detik dengan pemakaian daya listrik 140 Watt dengan kualitas pemotongan sempurna.
The Use Of Concept Map Strategy In Improving Students’ Ability In Composing Descritive Text Rizal, Syamsul; Juniarti, Juniarti
At-Ta'lim : Media Informasi Pendidikan Islam Vol 14, No 1 (2015): JUNI
Publisher : Institut Agama Islam Negeri Bengkulu

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Tujuan dari penelitian ini untuk meningkatkan kemampuan siswa dalam menulis deskriptif teks menggunakan strategi peta konsep di SMPN 1 Taba Penanjung. Penelitian ini merupakan penelitian tindakan kelas. Sample dari penelitian ini dalah siswa kelas VIIID di SMPN 1 Taba Penanjung yang terdiri dari 30 siswa. Data diperoleh dengan pemberian tes awal yang dilakukan sebelum adanya perlakuan dan memberikan tes pada siklus I, siklus II dan siklus III setelah adanya perlakuan. Hasil penelitian ini menunjukan bahwa ada peningkatan terhadap pemahaman menulis siswa dengan menggunakan peta konsep di SMPN 1 Taba Penanjung (Bengkulu Tengah). Hal ini dibuktikan dengan perolehan perbedaan nilai rata-rata tes awal dan nilai rata-rata tes akhir. Rata-rata nilai tes awal adalah 47,06 atau 6,89% sedangkan rata-rata tes akhir adalah 54,41 atau 20,68% pada siklus I, 72,27 atau 96,55% pada siklus II, dan 82,44 atau 100% pada siklus III. Peningkatanya dari tes awal sampai tes akhir pada siklus III adalah 35,38 atau 93,11%.