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All Journal BERKALA FISIKA JURNAL SISTEM INFORMASI BISNIS YOUNGSTER PHYSICS JOURNAL Jurnal Sains dan Teknologi Jurnal Ilmiah Kursor Jurnal Teknologi Informasi dan Ilmu Komputer Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Journal of Physics and Its Applications Journal of Information Systems and Informatics Jurnal Fisika Indonesia JINAV: Journal of Information and Visualization Jurnal Algoritma Journal of Emerging Science and Engineering Scientific Journal of Informatics
Catur Edi Widodo
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Astronomy Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology Mathematics Physics

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Simulasi Numerik Osilator Harmonis Edi Widodo, Catur
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A program for explain movement the harmonis oscillator have been done with Python programming language version 4.2. Program was simulated simple harmonic oscillator and damped harmonis oscillator.Program was constuct by mean finite difference equation in object oriented programming Python. First, object simulation is simple harmonic motion consist spring and mass slides on a frictionless horizontal surface. Second, object simulation is damped harmonic motion consist spring, mass and piston. The result of simulation indicated that the frequency osilation depend with force constant of the spring and mass, and damped depend damping ratio and mass.  
Simulasi Pengisian Tangki Cairan dengan Banyak Variabel Edi Widodo, Catur
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A program for determination of the height of liquid in the container has been done with Python programming language version 4.2. Program was simulated by  position of the height of the liquid dependent on  the time. Program was constuct by mean finite difference equation in object oriented programming Python. Object simulation is container with given radius and infinitif height and has two crane that is liquid enter crane and liquid leaves crane. Input parameter is radius of container, radius of enter crane, radius of leaves crane, and  flow rate of enter crane. Output is  height level of liquid. The result of simulation indicated the terminal velosity is dependent or radius of enter crane, radius of leaves crane, and  flow rate of enter crane
Perhitungan Kecepatan Terminal Obyek Jatuh di Udara Edi Widodo, Catur
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A program for determined terminal velocity of falling object in the air have been done with Python programming language version 4.2. Program was simulated interaction between massive object spheris with fluid gas (air). Program was construct by mean finite difference equation in object oriented programming Python. Object simulation is falling massive object spheris in static fluide. Input parameter is mass and radius object and viscosity  of  fluid. Output is direction and velocity of object. The result of simulation indicated the terminal velosity is depend on mass and radius of object  and viscosity of fluid.
Rancang Bangun Pengatur Cermin Sebagai Komponen Gerak Interferometer Pada Spektroskopi FTIR Adi Wibowo, Wahyu; Edi Widodo, Catur; Azam, M.; Firdausi, K. Sofjan
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Michelson's interferometer and mirror regulator system as components of its power have been designed. Interferometers stirred component is one of monotonic mirror on optic system. Interferometer is made accords Michelson's Interferometer attempt. Mirror M1 and mirror M2 is assembled mutually upright then one beam splitter placed before both of mirror. One laser light source is given before mirror M1 crosses beam splitter. There is a detector before mirror M2 crosses beam   splitter upright with laser light source. Mirror M1 is made flexible by assembled gear and stepper's motor to be able forward or backward motion then so called moveable mirror.  Stepper's motor is turned around by computer via parallel port. From interferometer engineering and mirror regulator system already been made, gotten interference pattern with ring amount that the less each mirror gets forward motion and ring amount that more and more each mirror moves to backward. Shift moveable mirror every step for forward or backward is 1,5 µm with distance sails through maximal be 6,0 mm. The in common result point out that interferometer and regulator system of moveable mirror show feature changed interference pattern along with mirror move. Key word: interferometer, moveable mirror, motor stepper, parallel port.
PENGARUH JARAK PADA KUALITAS CITRA HASIL REKONSTRUKSI MODE FAN BEAM DENGAN GEOMETRI DETEKTOR BERUPA GARIS Anam, Choirul; Widodo, Catur Edi
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Image recontruction for fan beam mode with line geometry of detectors have been done. Theobject being imaged is the Shepp-Logan phantom with matrix size 50x50. Projections were made forangle 00 to 3600 with angle interval 10. The distance between the rays in the midle of the object (s) isequivalent to 1 pixel. The distance of source to central of object (D) were varied 40,50, 60, 70, 80, 90,100, 110 pixels. Reconstruction of image was carried out by the method of filtered back projection(FBP) with Lek-Ram filter. It is obtained that if the distance of X-ray source and center of the object,smaller than 3/4 diagonal object, the image will be distorted, and if the distance is greater than 6/7diagonal object, the image will be clipped.Keywords: Image reconstruction, fan beam, line geometry of detector
Rancang Bangun Sistem Informasi Customer Loyalty untuk Keunggulan Kompetitif Organisasi Mulyani, Sri; Mustafid, Mustafid; Widodo, Catur Edi
JSINBIS (Jurnal Sistem Informasi Bisnis) Vol 2, No 2 (2012): Volume 2 Nomor 2 Tahun 2012
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (394.22 KB) | DOI: 10.21456/vol2iss2pp053-057

Abstract

Utilization of information technology to achieve competitive advantage has become a necessity  for business people and managers of organizations  in the information age now. This research aim to create a customer loyalty that the information system is one part of theCustomer  Relationship  Management  to  collect  data  on  indicators  of  customer  loyalty.  Indicator  of  customer  loyalty  is  determined according  empirical  model  customer  loyalty  and  create  customer  loyalty  information  system  that  can  be  used  to  gain  competitive advantage organizations. Structural Equation Modeling is used to obtain indicators of customer loyalty. Customer loyalty info rmation system designed using prototype system development and modeling analysis using Data Flow Diagram, database design using  Entity Relationship  Diagram,  and  a  web-based  interface.  Web-based  information  systems  that  provide online  customer  survey  facilities  and analysis  results  in  the  form  of  customer  loyalty  index  values  shaped  by  the  dynamic  graphic  indicator  of  loyalty  according  to  the empirical study of customer loyalty that can be used to gain competitive advantage. The value of customer loyalty index cons ists of four main variables, namely: the ability to anticipate customer value, customer value anticipation peace, customer satisfaction, and loyalty.Keywords: Customer loyalty, Structural Equation Modeling, Index loyalty, Competitive advantage
Penggunaan Algoritma CART untuk Pemilihan Bingkai Kacamata dengan Penerapan Model Morfologi Indeks Wajah untuk Identifikasi Bentuk Wajah Retno Hapsari, Angga Ayu; Gernowo, Rachmat; Widodo, Catur Edi
JSINBIS (Jurnal Sistem Informasi Bisnis) Vol 10, No 1 (2020): Volume 10 Nomor 1 Tahun 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1090.936 KB) | DOI: 10.21456/vol10iss1pp1-9

Abstract

The large variety of frame shapes and sizes make it difficult for consumers to choose which one suits their face. The absence of a standard frame style guide between face types against the eyeglass frame complicates the selection of eyeglass frames. The application of the Zen principle (balance) in the selection of the right frame expected to be a consideration in choosing eyeglass frame. Various forms of eyeglass frames that look like a square, round and oval make the Zen principle difficult to apply, so machine learning is needed to be able to create eyeglass frames selection system. Face shape identification help to determine eyeglass frames. Face shape identification is done based on the morphological facial index by calculating face length and width. The decision tree CART algorithm is chosen as a method for selecting eyeglass frames. The study uses 109 face data that have been selected by the optical, from 109 data divided into two parts, 100 training data, and 9 test data. The prediction system produces an accuracy value of 93% at max depth 6 for reading glasses and 91% for sunglasses. The implementation of the CART algorithm is proven to be able to predict the selection of eyeglass frames using morphological attributes of face index.
Various Implementation of Collaborative Filtering-Based Approach on Recommendation Systems using Similarity Romadhon, Zainur; Sediyono, Eko; Widodo, Catur Edi
Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Vol. 5, No. 3, August 2020
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/kinetik.v5i3.1062

Abstract

The Recommendation System plays an increasingly important role in our daily lives. With the increasing amount of information on the internet, the recommendation system can also solve problems caused by increasing information quickly. Collaborative filtering is one method in the recommendation system that makes recommendations by analyzing correlations between users. Collaborative filtering accumulates customer item ratings, identifies customers with common ratings, and offers recommendations based on inter-customer comparisons. This study aims to build a system that can provide recommendations to users who want to order or choose fast food menus. This recommendation system provides recommendations based on item data calculations with customer review data using a collaborative filtering approach. The results of applying cosine similarity calculation to determine fast food menu recommendations obtained for the item-based recommendation is Pizza Frankfurter BBQ Large with a value of 1.0, item-based with genre recommendation is Calblend Float with value 1.0 and user-based recommendation is Pizza Black Pepper Beef / Chicken Large with mean score 2.5.
Implementation of K-Means Clustering and Weighted Products in Determining Crime-Prone Locations Rahmatika, Yuni; Sediyono, Eko; Widodo, Catur Edi
Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Vol. 5, No. 3, August 2020
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/kinetik.v5i3.1067

Abstract

Clustering algorithms can be used to build geographic mapping systems to determine crime-prone locations. This study aims to establish a geographical mapping system to determine crime-prone locations that can help police control certain locations that often occur crime and provide information to people in crime-prone locations. Criminal groups are calculated based on crime data from November 2018 to October 2019 which occurred in 9 districts in Kudus Regency. The crime grouping process uses the k-means method used to classify based on regional vulnerability and uses a weighted product method that functions as a vulnerability ranking that is vulnerable to crime selection. The grouping results obtained from this study are that there are 1 very vulnerable area, 5 areas in the vulnerable category, and 3 safe areas. While the weighted product method produces Melatilor area as a vulnerable area to be defeated by a score of 0.182093. This research provides benefits for the public to see crime-prone areas so that they can be more vigilant, while for the police to analyze crime so as to speed up the process of resolving crime and increase and improve crime prevention measures.
Perbandingan Metode Simple Additive Weighting dan Analytic Hierarchy Process Untuk Pemilihan Supplier pada Restoran Yulaikha Maratullatifah; Catur Edi Widodo; Kusworo Adi
Jurnal Teknologi Informasi dan Ilmu Komputer Vol 9 No 1: Februari 2022
Publisher : Fakultas Ilmu Komputer, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25126/jtiik.2022914428

Abstract

Kedai susu Its Milk adalah restoran yang bergerak di bidang kuliner dengan ciri khas menu pengolahan susu, bahan utamanya menggunakan susu sapi murni lokasi berada di jalan Taman Siswa Unnes Gunungpati Semarang. Bahan baku susu sapi diperoleh dari supplier. Pemilihan supplier yang tepat adalah kunci kestabilan usaha diantaranya dapat mengurangi biaya, mengurangi resiko rantai pasokan, meningkatkan nilai barang dan membentuk strategi perusahaan. Permasalahan restoran yang terkait supplier adalah kualitas, kuantitas, harga, pelayanan dan garansi. Oleh karena itu, perlu dilakukannya pemilihan supplier yang tepat. Metode SAW dan AHP merupakan metode paling mendominasi diantara metode lainnya untuk sistem pemilihan supplier. Perhitungan sedehana dan mudah adalah keunggulan SAW, data yang terperinci adalah keunggulan AHP, dibandingkan juga dengan Euclidan Distance untuk penentuan metode yang paling baik yaitu memiliki nilai mendekati nol. Tujuan penelitian ini membandingkan metode SAW dan AHP dalam pemilihan supplier pada restoran. Data penelitian diperoleh dari pemilik dan managemen Its Milk berupa kuesioner dan wawancara. Hasil perbandingan metode diperoleh hasil alternatif  yang sama di dalam satu pengujian yaitu terpilihnya supplier A2 dengan nilai akurasi di SAW 0,86 dan akurasi di AHP 0,229. Berdasar euclidean distance metode AHP yang paling baik digunakan dalam penelitian ini dengan nilai rata-rata 0,19 sedangkan SAW nilai rata-rata 0,90. AbstractKedai Susu Its Milk is a restaurant in the culinary field with a characteristic menu of milk processing, the main ingredient of pure cow's milk is located on Jalan Taman Siswa Unnes Gunungpati Semarang. Raw material for cow's milk from suppliers. Selection of the right supplier is the key to business stability including reducing costs, reducing supply chain risk, increasing the value of goods and shaping company strategy. Restaurant problems related to suppliers are quality, quantity, price, service and warranty. Therefore, it is necessary to choose the right supplier. The SAW and AHP methods are the most dominating methods among other methods for supplier selection systems. Simple and easy calculations are the advantages of SAW, detailed data is the advantage of AHP, compared to Euclid and Distance for determining the best method, which has a value close to zero. The purpose of this study is to compare the SAW and AHP methods in the selection of suppliers in restaurants. Research data obtained from the owner and management of Its Milk in the form of questionnaires and interviews. The results of the comparison of methods obtained the same alternative results in one test, namely the selection of supplier A2 with an accuracy value of 0.86 in SAW and 0.229 accuracy in AHP. Based on the euclidean distance, the best AHP method used in this study is with an average value of 0.19, while SAW has an average value of 0.90.
Co-Authors Agusta Rakhmat Taufani Aprilia Ayu Andarinny Arif Setiawan Budi Warsito Choirul Anam AM Diponegoro Didik Supriyadi, Didik Eko Sediyono Fatkhur Rohman Figur Humani Fitra Nur Asri, Muh H Hadiyanto Hadyan Arifianto Husen Nasrullah Armin I Gusti Bagus Wiksuana Irwan Agus Saputro Isnain Gunadi Iswanti, Arie Jatmiko Endro Suseno K. Sofjan Firdausi Kusworo Adi Kuworo Adi Labib Mustofa, Refo Labib Mustofa, Tarno Muchammad Azam, Muchammad Mustafid Mustafid Oky Dwi Nurhayati Otong Saeful Bachri R Rizal Isnanto R. Rizal Isnanto Rachmat Gernowo Rahmatika, Yuni Ramanda, Febri Retno Hapsari, Angga Ayu Rizky Ayomi Syifa Romadhon, Zainur Royani, Noorhanida Saitem Saitem Salsabila Naqiyah Sri Mulyani Tri Retnaningsih Soeprobowati Tutur Urip Ucky Pradestha Novettralita Wahyu Adi Wibowo Yulaikha Maratullatifah Zainal Bachrudin