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Simulation and computational analysis of fire sprinkle bulb activation with variation of liquid and wall thickness

AIP Conference Proceedings 2020年第1期2314卷

作者： Alfian Pramudita Putra Erik Jan Westerman Akif Rahmatillah 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 2Department of Biomedical Engineering Faculty of Science and Engineering University of Groningen Groningen The Netherlands

Fire sprinkler is a safety system that is active when fire is detected. It consists of a bulb that holds the water flow and made of glass with liquid inside. The increase of temperature in its environment would expand the volume of the liquid and break the glass which leads to water spray to extinguish the fire. This study aims to model and simulate the fire sprinkler bulb and optimize several parameters related to its activation including the thickness of the bulb, type of liquid and the ratio of air and liquid inside the bulb. The modeling and simulation was performed in COMSOL Multiphysics with variation of wall thickness and liquid inside the bulb. The result showed that the best parameter was the liquid of glycerol, a height of 17.5 mm and a glass thickness of 0.1 mm, this resulted in the air to liquid ratio of 0.0042428 and breaking time of 7.2400s. This result was the fastest breaking time towards several simulations. For future study, several parameters need to be considered in the simulation to minimize the gap between the simulation and the actual condition, such as room condition, and water pressure.

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Changes in electroencephalography complexity of acute Ischemic stroke: A fuzzy approximate entropy analysis

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AIP Conference Proceedings 2020年第1期2314卷

作者： Osmalina Nur Rahma Alfian Pramudita Putra Angga Bagus Prasetyo Riries Rulaningtyas Sastra Kusuma Wijaya 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Airlangga University Indonesia 2Department of Physics Faculty of Mathematics & Natural Science University of Indonesia Indonesia

Stroke is one of the leading causes of death in the world. The previous study had shown that EEG (Electroencephalogram) was a promising tool to detect stroke since it is non-invasive and cheap. So, the EEG analysis method needs to be more explored to give an accurate prognosis assessment. Previously, complexity analysis, such as Fuzzy Approximate Entropy (fApEn), had been successfully differentiated between control and patients with Alzheimer's Disease. Thus, this study used fApEn to analyse the changes of electroencephalography complexity in Acute Ischemic Stroke (AIS) during hyperventilation and photic stimulation, which are a general protocol to investigate the abnormality in EEG. Photic stimulation conducted using white light that flashed with frequency 5Hz, 10Hz, and 15Hz consecutively for three minutes and then continued by hyperventilation for three minutes, approximately. This study compared the fApEn value from healthy subjects with AIS patients. The result showed that patient with AIS tended to conduct the lower and higher fApEn value compared to the healthy subject. The lower value of fApEn occurred because of the presence of the slow-waves on the EEG, while the higher fApEn indicated the epileptiform activity during the recording. The increment of the slow-waves and the presence of epileptiform activity could be considered as the characteristic of stroke even though its appearance is uncertain. However, complexity analysis of EEG could be useful in differentiating the healthy subject and patient with stroke or classifying the severity level of the stroke to improve stroke management.

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In-vitro characterization of 3D printed PLA scaffold with hydroxyapatite-chitosan coating for mandibula reconstruction

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AIP Conference Proceedings 2020年第1期2314卷

作者： Anis Fitria Wulandari Siti Zulaihah Ika Rachmadanti Aminatun 1Biomedical Engineering Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya 60115 Indonesia 2Physics Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya 60115 Indonesia

The mandibula is a part of the face that determines its shape as well as a place to attach the muscles of the mouth which has functions for chewing, swallowing, talking and yawning. Similar to other body organs, the mandibular bone can experience abnormalities, such as benign and malignant tumors. The tumor can potentially cause physiological and aesthetic disorders, so it needs to be resected in order to remove the infected part. This research was conducted to find out the potentials of 3D printed PLA scaffold with hydroxyapatite-chitosan coating for mandibula reconstructing through the contact angle test, the water absorption test and the biocompatibility test by in-vitro. The scaffold was made from polylactic acid (PLA) using 3D printing method of Fused Deposition Modelling (FDM) with a pore diameter of 1000 µm. Polylactic acid (PLA) is bioactive and hydrophobic filaments that needed to be coated with a bioactive material such as hydroxyapatite as well as a hydrophilic material such as chitosan. The composition variations of hydroxyapatite-chitosan which were used as the coating include A (70:30), B (60:40), C (50:50), D (40:60) and E (30:70). To determine the characteristics of the scaffold, several characterizations were carried out, namely the contact angle tests, the absorbency tests and the biocompatibility test. The characterization result from the contact angle test showed that PLA scaffold which has been coated with hydroxyapatite-chitosan is hydrophilic with contact angles of 45.7 - 71.3° in 25 minutes. The absorption test result showed a number of 4.15 - 9.34% from the first day to 9.57 - 12.90% on the seventh day which indicated that as the concentration of the chitosan increases, the water absorption also increases. Meanwhile, the biocompatibility test proved that scaffolds are non-toxic and safe for the body because they have a cell viability of 92.74 - 111.42%.

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Synthesis and characterization of acrylic resin with ultra high molecular weight polyethylene (UHMWPE) addition as dental prosthetic base

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AIP Conference Proceedings 2020年第1期2314卷

作者： Prihartini Widiyanti Siswanto Ika Fauziyatus Silfiana 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 2Departement of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

Acrylic based resins are frequently used in daily dental practice. The most common use of the materials includes denture bases and denture liners. Dental prosthetic base is part of a denture that rests on the supporting network elements where the artificial tooth is placed. The problem with the denture base is the high incidence of dental base fracture due to masticatory pressure. This study is aimed to obtain the best properties of fiber acrylic resin as a dental prosthetic base by adding Ultra High Molecular Weight Polyethylene (UHMWPE). UHMWPE fiber length variation used was 0 mm, 2 mm, 4 mm, 6 mm, and 8 mm with a width of 2 mm fiber. The characterization test was porosity, density, compressive strength and hardness. The porosity test are showed that its best value was 1.695%, while the highest density test was 1.177 g/cm3. The highest compressive strength test was at 67.615 MPa and the highest hardness was 17.1 kgf/mm2. Based on all results,they are showed that the variation of UHMWPE fiber length with a width of 2 mm affected the physical and mechanical properties of dental prosthetic base materials.

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The effect of polystyrene addition in characteristics of zinc oxide eugenol dental cement

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AIP Conference Proceedings 2020年第1期2314卷

作者： Prihartini Widiyanti Siswanto Betanty Prasetya Sadewi 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 2Departement of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

Zinc oxide-eugenol cements are easier to be tolerated by tissue than other dental materials. They could relieve pain, antibacterial and antiseptic. The cements provide better sealing properties than other type of cements. They used as temporary filling materials, gingival dressings due to their poor mechanic properties. In order to increase the mechanical properties and to reduce solubility of this cement,the additive must be added in the composition of this cement. This study used dental materials, namely zinc oxide eugenol dental cement and polystyrene additives. The sample used in this study was made of the dental cement composition of zinc oxide eugenol cement without the addition of additives polystyrene and with the addition of 2%, 5% and 10% variations of *** results of the tensile strength test and compressive strength test are showed that the larger the percentage of polystyrene additives added to the samples, the greater the two parameters of mechanical strength. This result was in accordance with microstructure characteristic using Scanning Electron Microscopy (SEM) which showed that the greater the percentage of the polystyrene additive, the more subtle the connection between the cement and the teeth.

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Design and development of photonic-based non-invasive hemoglobin level detector

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AIP Conference Proceedings 2020年第1期2314卷

作者： Suryani Dyah Astuti Ikhsan Rino Wijaya Osmalina Nur Rahma Alfian Pramudita Putra Muhammad Fahmi Akif Rahmatillah Riries Rulaningtyas 1Biomedical Engineering Master Degree Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 2Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 3Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

Hemoglobin is the protein molecule that binds oxygen in the blood. Hemoglobin level can be used as a benchmark of the human physiological condition, such as anemia, hypoxia, and postoperative bleeding. Generally, measurement of hemoglobin levels is performed by an invasive method that takes blood samples to be tested. This study offers a tele-monitoring system for measuring the hemoglobin level non-invasively, so it could reduce the possibility of infection or contamination to the body and can be monitored anywhere by using a website. This tele-monitoring device of non-invasive hemoglobin and oxygen saturation levels were designed by integrating the pulse oximetry sensor with signal conditioning circuit, Arduino Uno as a microcontroller, Ethernet module, an internet network, cloud server, and website. Pulse oximetry measured the oxygen saturation in the blood that indicate the vital state of human and became essential to determine the amount of hemoglobin level. The system performance in this study was tested on participants who had a good daily exercise and participants who never had daily activities to discover the correlation between hemoglobin levels with human physical activity and obtained 89% of accuracy. This system can be implemented as a personal device for monitoring the hemoglobin level and the oxygen saturation in daily used.

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Preliminary study of the polymesoda expansa based hydroxyapatite for medical devices coating application

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AIP Conference Proceedings 2020年第1期2306卷

作者： M. Riza Roslan N. F. Mohd Nasir M. A. Gilani Nur Farahiyah Mohammad E. M Cheng M. F. Abdul Khalid A. S. Zoolfakar N. A. M. Amin S. F. Khan 1Biomedical Electronic Engineering Program School of Mechatronic Engineering Universiti Malaysia Perlis Perlis Malaysia 2Microwave Research Institute (MRI) Universiti Teknologi Mara Shah Alam Malaysia 3Faculty of Electrical Engineering Universiti Teknologi Mara Shah Alam Malaysia 4Mechanical Engineering Program School of Mechatronic Engineering Universiti Malaysia Perlis Perlis Malaysia

Hydroxyapatite (HA) which is a group of calcium phosphate (CaP) is used as a medical devices coating due to its ability to increase the bioactivity and biocompatibility of the device surface. The attraction of using waste seashells products is interesting due to its sustainability and low cost solution especially in biomedical application. Polymesoda expansa or locally known as Lokan is potentially rich with calcium carbonate (CaCO3). Here, the synthesis of HA was done via precipitation method by utilizing the Polymesoda expansa (Lokan) shells as the resource of calcium precursors. Hydroxyapatite synthesized from Polymesoda expansa was carried out with different pH solution (pH 9 and 13) in alkaline environment. The effects of pH on the morphological and chemical composition properties as well as the Ca/P ratio of HA powders were analyzed through Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Energy Dispersive X-ray Spectrometry (EDS). The finding demonstrates as the pH increases, the calcium apatite reduced and this had increases the Ca/P ratio.

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Dental composite resin: A review

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AIP Conference Proceedings 2019年第1期2193卷

作者： Yori Rachmia Riva Siti Fauziyah Rahman 1Biomedical Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia

Composite resin is one of dental material restoration that used in every dental office nowadays. Dental amalgam restoration had several problems in aesthetic and biocompatibility in oral cavity. To overcome the problem, dental composite resin which has great aesthetic, biocompatibility, physical, and mechanical properties has been developed. Composite resins are filled resin and have high compressive strength, abrasion resistance, ease of application, and high translucency. The objective of this review article is to review about dental composite resin including the composition, polymerization process, classification, and physical properties (water sorption, solubility, and polymerization shrinkage) of dental composite resin. Literature relating to dental composite resin and measurement of several physical properties, research methodologies, and contributing factors are selected and reviewed.

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Expert system for risk prediction of cesarean section delivery with Dempster Shafer method

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AIP Conference Proceedings 2020年第1期2314卷

作者： Ismaiba Riries Rulaningtyas Katherine Ernawati 1Biomedical Engineering Program Study Faculty of Science and Technology Universitas Airlangga Campus C Zip Code: 60115 Surabaya East Java Indonesia 2Fetomaternal Division of Obstetrics and Gynecology Department Faculty of Medicine Universitas Airlangga Campus A Zip Code: 60131 Surabaya East Java Indonesia

The maternal mortality rate in Indonesia is related to the lack of knowledge of mothers regarding high-risk pregnancies, especially with cesarean delivery. In this case, the prediction system designed is done as an effort to increase the awareness of mothers or women who were preparing for high-risk pregnancies. In this article, an Android-based prediction application will be presented using an expert system with the Dempster Shafer method. This method is based on a mathematical theory which consists of a combination of belief function and plausible reasoning from the risk parameters of each labor class by representing the knowledge obtained from experts. This study uses 16 risk parameters as input based on Poejo Rochati's high-risk pregnancy card with 2 outputs, with risk or no risk of having cesarean delivery. The result obtained from this system is 85%, concludes that the prediction system is able to predict the risk of cesarean delivery.

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Tuberculosis detection analysis using texture features on CXRs images

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AIP Conference Proceedings 2019年第1期2092卷

作者： Badarudin Hakim Basari 1Biomedical Engineering Course Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java Indonesia 16424 2Research Center for Biomedical Engineering Universitas Indonesia Depok 16424 West-Java Indonesia

Tuberculosis (TB) is one of the most common diseases in developing countries such as Indonesia. TB disease oftenly attacks the human lungs due to its high oxygen pressure. The basic characteristics of TB-infected lungs are in the form of wounds, which change its texture and shape. The common detection method is by comparing the X-ray thoracic image with the tuberculin skin test (TST) and fast acid staining methods. This diagnosis method is often constrained by the availability of radiologists in the health facilities. To overcome such situation, a computer-aided diagnosis (CAD) tool is required to assist the doctor read the X-ray images easily. In this paper, a complementary detection method is proposed by using a chest X-ray (CXR) image to assist the diagnosis process. In current method, the image is segmented to reduce unnecessary parts prior to preprocessing step. We use a texture-based feature approach for detection purpose because most of the common examination methods for abnormality detection on CXRs is by analyzing the change of textural (content) CXR. In our texture approach, we use texture-based statistical properties on the histogram’s intensity. Some features that are used in this approach including Mean, Standard Deviation, Smoothness, Entropy, Root Mean Square (RMS), Variance, Kurtosis, Skewness, and Inverse Difference Moment (IDM). As a result of simulation, it indicates that CXR images can be well segmented to localize the focus area, allowing to the features can be extracted from the CXR image for further detection process. The obtained accuracy is about 93.94% and 92.86%, respectively for Shenzhen-Chest X-ray dataset and Montgomery County-Chest X-ray dataset.

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