Freddy Haryanto
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View article: The Influence of Government Policy and Service Quality on the Competitive Advantage of MSMEs through Product Innovation
The Influence of Government Policy and Service Quality on the Competitive Advantage of MSMEs through Product Innovation Open
This study aims to evaluate the influence of government policies and service quality on the competitive advantage of Micro, Small, and Medium Enterprises (MSMEs) through the mediation role of product innovation in Kediri City. The study us…
View article: Green-Synthesized Nanoflower FeNi Catalysts for Low-Temperature Pyrolysis of Waste Lubricating Oil into High-Quality Diesel-Like Fuel
Green-Synthesized Nanoflower FeNi Catalysts for Low-Temperature Pyrolysis of Waste Lubricating Oil into High-Quality Diesel-Like Fuel Open
The growing accumulation of waste lubricating oil presents serious environmental issues, calling for sustainable management solutions. This research discusses the creation of FeNi/TiO2 nanocatalysts that were synthesized through an eco-fri…
View article: Design and Development of a 3D-Printed Tissue Equivalent Phantom for Cobalt-60 HDR Brachytherapy
Design and Development of a 3D-Printed Tissue Equivalent Phantom for Cobalt-60 HDR Brachytherapy Open
The use of 3D phantoms represents patient anatomy, enabling more effective treatment planning optimization. This study aims to develop a tissue-equivalent 3D-printed phantom as a dosimetry application for the HDR-BT Cobalt-60 source. Polyl…
View article: Persepsi Guru Pendidikan Guru Jasmani Sekolah Dasar terhadap Penggunaan Permainan Tradisonal Sebagai Media dalam Mencapai Tujuan Pembelajaran
Persepsi Guru Pendidikan Guru Jasmani Sekolah Dasar terhadap Penggunaan Permainan Tradisonal Sebagai Media dalam Mencapai Tujuan Pembelajaran Open
Beberapa siswa saat mengikuti pembelajaran olahraga berbasis permainan tradisional di sekolah dasar terlihat tidak aktif atau pasif, padahal jika diikuti secara aktif akan memberikan dampak yang positif bagi siswa. Tujuan dilakukan penelit…
View article: Evaluation of physical properties and image quality of a breast tissue phantom with glycerol-enhanced polyvinyl chloride plastisol for ultrasound imaging
Evaluation of physical properties and image quality of a breast tissue phantom with glycerol-enhanced polyvinyl chloride plastisol for ultrasound imaging Open
Purpose: This study aimed to fabricate and evaluate breast tissue-equivalent phantoms with varying glycerol concentrations, focusing on their physical properties (density, elasticity, and acoustic parameters) and ultrasound image quality m…
View article: Evaluation of 6 MV photon beam characteristics on Varian Clinac iX: a Monte Carlo study
Evaluation of 6 MV photon beam characteristics on Varian Clinac iX: a Monte Carlo study Open
This work aims to study the characteristics of photon beams through phase space file (PSF) analysis using Monte Carlo (MC) simulation. 6 MV photon beams from the Varian Clinac iX were simulated using PRIMO software. The beam parameters wer…
View article: Investigation of the effects of tissue material on the energy spectrum from Bebig Co-60 High Dose Rate Brachytherapy source based on the Monte Carlo simulation
Investigation of the effects of tissue material on the energy spectrum from Bebig Co-60 High Dose Rate Brachytherapy source based on the Monte Carlo simulation Open
View article: 2-AFC for Detectability of Low Contrast Object of CT Images Scanned with Two Doses and Recontructed with Various Iterative Recontruction (IR) Levels
2-AFC for Detectability of Low Contrast Object of CT Images Scanned with Two Doses and Recontructed with Various Iterative Recontruction (IR) Levels Open
This study aims to evaluate images of the low contrast and small objects of the American Association of Physicists in Medicine (APPM) computed tomography (CT) phantom scanned with two doses and reconstructed with various iterative reconstr…
View article: SISTEM UJI TAK RUSAK BERBASIS ULTRASONIK UNTUK KONTROL KUALITAS PADA FABRIKASI BATA TIMBAL
SISTEM UJI TAK RUSAK BERBASIS ULTRASONIK UNTUK KONTROL KUALITAS PADA FABRIKASI BATA TIMBAL Open
BATAN memiliki wewenang dalam meningkatkan kualitas produksi bata timbal yang masih difabrikasi secara konvensional. Oleh karena itu, dikembangkan sebuah sistem uji tak rusak ini yang terdiri dari transduser Partial Immerse Technique yang …
View article: Exploring the Impact of Motion Parameter Variations in Virtual Reality Content on Visually Induced Motion Sickness: An Electroencephalography Signal Analysis Approach
Exploring the Impact of Motion Parameter Variations in Virtual Reality Content on Visually Induced Motion Sickness: An Electroencephalography Signal Analysis Approach Open
The utilization of virtual reality (VR) technology has surged during the COVID-19 pandemic, leading to a diversification of its applications. However, one significant challenge associated with VR usage is visually induced motion sickness (…
View article: The Effect of Myopia on Brain Signals: Insights from EEG Studies
The Effect of Myopia on Brain Signals: Insights from EEG Studies Open
Refractive vision disorders, such as myopia, can significantly influence an individual's cognitive performance, particularly their ability to perceive and interpret visual stimuli. Myopia, a common refractive error affecting children and a…
View article: Accuracy and Characteristic of Electrocardiographic Signal from Mobile Biomedical Sensor
Accuracy and Characteristic of Electrocardiographic Signal from Mobile Biomedical Sensor Open
Based on the Global Burden of Disease and the Institute for Health Metrics and Evaluation 2014-2019, heart disease is the highest cause of death in Indonesia. One way to deal with this disease is through early detection by reading the elec…
View article: Investigating the effect of the material absorber of gamma knife PerfexionTM source based on Monte Carlo simulations
Investigating the effect of the material absorber of gamma knife PerfexionTM source based on Monte Carlo simulations Open
Gamma Knife PerfexionTM (GKP) is a stereotactic surgical device that uses Cobalt-60 sources. For radiation protection purposes, it is encapsulated from specific materials. When the source beam is emitted, the photons and absorber atoms' in…
View article: Eco-friendly Nanocatalysts: Unleashing Non-Precious Metal Potential for Methylene Blue Remediation
Eco-friendly Nanocatalysts: Unleashing Non-Precious Metal Potential for Methylene Blue Remediation Open
Water pollution stemming from textile dyes, particularly methylene blue (MB), represents a formidable challenge to both the environment and human well-being. In response to this pressing issue, scientists have redirected their focus toward…
View article: A Comparative Study of Alpha Frequency Analysis between Medical and Consumer-grade Electroencephalography Devices on the Measurement of Male Healthy Subjects
A Comparative Study of Alpha Frequency Analysis between Medical and Consumer-grade Electroencephalography Devices on the Measurement of Male Healthy Subjects Open
The relatively high cost of medical-grade electroencephalography (EEG) devices has pushed the production of low-cost wireless consumer-grade devices. Therefore, it is essential to assess the performance of wireless consumer devices to dete…
View article: Comparison of CTDIw and Homogeneity Index on CTDI Phantoms
Comparison of CTDIw and Homogeneity Index on CTDI Phantoms Open
The study was conducted to compare the Computed Tomography Dose Index Weighted (CTDIw) value values and homogeneity index on head and body phantoms with tube voltage variations. Two CTDI phantoms are Gammex (Sun Nuclear, Florida, United St…
View article: Validation of Varian Clinac iX Model on 6 MV Photon Beam Using Fast Monte Carlo Simulation
Validation of Varian Clinac iX Model on 6 MV Photon Beam Using Fast Monte Carlo Simulation Open
Monte Carlo (MC) is widely recognized as the most accurate method for dosimetry analysis in radiotherapy due to its precision. However, successful MC dose calculation hinges upon the validation of the linac model employed in simulations. T…
View article: Electroencephalography Signal Analysis for Virtual Reality Sickness: Head-mounted Display and Screen-based
Electroencephalography Signal Analysis for Virtual Reality Sickness: Head-mounted Display and Screen-based Open
The use of virtual reality (VR) technology is growing in the current era of the COVID-19 pandemic. However, the use of VR is causing problems for its users. Some symptoms, such as nausea, headache, and eye strain, are felt after using VR. …
View article: A Multimodal Model of ECG and Heart Sound Signal by Considering Normal and Abnormal Heart
A Multimodal Model of ECG and Heart Sound Signal by Considering Normal and Abnormal Heart Open
Analysis of the opening and closing of heart valves and the movement of blood flow in the heart are important in the domain of early detection of heart conditions. To build this correlation model, multimodal signals from electrocardiograph…
View article: Evaluation of Physical Properties and Image of Polyvinyl Chloride as Breast Tissue Equivalence for Dual-Modality (Mammography and Ultrasound)
Evaluation of Physical Properties and Image of Polyvinyl Chloride as Breast Tissue Equivalence for Dual-Modality (Mammography and Ultrasound) Open
Tissue-mimicking phantom (TMP) is gradually becoming a fundamental element for quality assurance and control in ionizing and non-ionizing radiation imaging modalities as well as in the development of different techniques. This study aims t…
View article: Analysis of Image Fusion Effect in Image Quality of Kidney Stone
Analysis of Image Fusion Effect in Image Quality of Kidney Stone Open
Kidney stones are a disease due to the buildup of substances that are not needed in the urinary system. Knowledge of the composition and type of stone is required in the treatment of action. Micro CT is one of the modalities that can be us…
View article: Investigation of Electron Contamination on Flattened and Unflattened Varian Clinac iX 6X and 15X Photon Beam Based on Monte Carlo Simulation
Investigation of Electron Contamination on Flattened and Unflattened Varian Clinac iX 6X and 15X Photon Beam Based on Monte Carlo Simulation Open
The aim of this study was to characterize electron contamination of a flattened (FF) and an unflattened (FFF) Varian Clinac iX 6X and 15X photon beams using Monte Carlo (MC) simulation. EGSnrc MC technique was used to model the flattened a…
View article: Monte Carlo Simulation of particle production in target material linac 15, 18, and 20 MV photon beam
Monte Carlo Simulation of particle production in target material linac 15, 18, and 20 MV photon beam Open
Target is one of the important components in a linear accelerator (linac). Target materials depend on the energy of linac so that they have different spectrums produced. This study investigates the spectrum characteristic of target materia…
View article: The Dose Distribution from Iridium-192 Source on Cervical Cancer Brachytherapy by Manchester System Using Monte Carlo Simulation
The Dose Distribution from Iridium-192 Source on Cervical Cancer Brachytherapy by Manchester System Using Monte Carlo Simulation Open
One treatment for cervical cancer is to use radioactive sources that directly target the cancer cell called brachytherapy. This study is aimed to determine dose distribution at phantom pelvis using the DOSXYZnrc Monte Carlo code. The phant…
View article: STUDY OF THE EFFECT OF MAGNETIC FIELDS ON ELECTROENCEPHALOGRAPHY MEASUREMENT IN FARADAY’S CAGE
STUDY OF THE EFFECT OF MAGNETIC FIELDS ON ELECTROENCEPHALOGRAPHY MEASUREMENT IN FARADAY’S CAGE Open
Electroencephalography (EEG) is a method for recording the brain's electrical activity through electrodes placed on the scalp's surface. The amplitude of the EEG signal is in the 40–100 V range, with the five main frequencies in the 0 to 1…
View article: Application of uCT-scan and infrared spectroscopy for determination of urinary stone components
Application of uCT-scan and infrared spectroscopy for determination of urinary stone components Open
Abstrak. Batu kemih merupakan salah satu penyakit dengan tingkat prevalensi yang cukup tinggi di Indonesia. Pengetahuan komposisi pada kandungan batu kemih dapat membantu tenaga medis dalam melakukan justifikasi penanganan tindakan lanjut …
View article: Evaluation of the dosimetric characteristics of 10 MV flattened and unflattened photon beams in a heterogeneous phantom
Evaluation of the dosimetric characteristics of 10 MV flattened and unflattened photon beams in a heterogeneous phantom Open
Evaluation of the dosimetric characteristics of 10 MV flattened and unflattened photon beams in a heterogeneous phantom
View article: An improved method for automated calculation of the water‐equivalent diameter for estimating size‐specific dose in CT
An improved method for automated calculation of the water‐equivalent diameter for estimating size‐specific dose in CT Open
Purpose The aim of this study is to propose an algorithm for the automated calculation of water‐equivalent diameter (D w ) and size‐specific dose estimation (SSDE) from clinical computed tomography (CT) images containing one or more substa…
View article: A comparison on the use of Perlin-noise and Gaussian noise based augmentation on X-ray classification of lung cancer patient
A comparison on the use of Perlin-noise and Gaussian noise based augmentation on X-ray classification of lung cancer patient Open
The use of deep learning in medical image classification has become an important study in the past few years. The proper use of this method, however, is still hindered by many problems, one of it being the imbalance of dataset available fo…
View article: Post-disaster effect on radiation safety in multihospital radiological unit: a one-year post-earthquake observation report in Lombok
Post-disaster effect on radiation safety in multihospital radiological unit: a one-year post-earthquake observation report in Lombok Open
A series of earthquakes that hit Lombok, Nusa Tenggara Barat, in the span of August - September 2018 had caused a massive destruction and major damage especially in the structure of buildings including the radiological unit in the hospital…