Institut Teknologi Telkom Surabaya
  • Surabaya, East Java, Indonesia
Recent publications
I-Graciass is one of the digicampus programs under the Directorate of Digital Transformation, Synergy &Performance (DTSP) of the Telkom Education Foundation (YPT) in the form of a smart app & information system as an integrated academic and non-academic management information system. Based on the Vision-Mission, Strategy and Tagline of YPT as The Leader of ICT Education Provider in Indonesia as well as the spirit of carrying out digital transformation in the foundation, so that I-Graciass becomes mandatory to be adopted and implemented in all Higher Education Institutions (Lemdikti) under the guidance of YPT. However, the facts on the ground of the process of adopting and implementing I-Graciass in each Lemdikti are not easy things. For this reason, this research was carried out in order to facilitate the process of adopting and implementing I-Graciass through the method of climbing Knowledge Management Systems (KMS) in all YPT Lemdikti, especially for new universities such as Telkom Institute of Technology Surabaya and other new universities that will later be established by YPT. The results of this study show that the factors that influence the success of the I-Graciass Adoption process at ITTelkom Surabaya and other Lemdikti consist of tennis and non-technical aspects that can refer to the implementation of best practices in the previous lemdikti. In addition, to support the success rate of adoption and implementation, an effective knowledge transfer process is needed through the use and development of the right KMS for an organization and its end users.
Recently, magnetorheological grease (MRG) has been utilized in magnetorheological (MR) brakes to generate a braking torque based on the current applied. However, the high initial viscosity of MRG has increased the off-state torque that led to the viscous drag of the brake. Therefore, in this study, the off-state viscosity of MRG can be reduced by the introduction of dilution oil as an additive. Three samples consist of pure MRG (MRG 1) and MRG with different types of dilution oil; hydraulic (MRG 2) and kerosene (MRG 3) were prepared by mixing grease and spherical carbonyl iron particles (CIP) using a mechanical stirrer. The rheological properties in the rotational mode were examined using a rheometer and the torque performances in MR brake were evaluated by changing the current of 0 A, 0.4 A, 0.8 A, and 1.2 A with fixed angular speed. The result shows that MRG 3 has the lowest viscosity which is almost 93% reduction while the viscosity of MRG 2 has lowered to 25%. However, the torque performances generated by MRG 3 were highest, 1.44 Nm, when 1.2 A of current was applied and followed by MRG 2 and MRG 1. This phenomenon indicated that the improvement of torque performances was dependent on the viscosity of MRG. By reducing the viscosity of MRG, the restriction on CIP to form chain formation has also decreased and strengthen the torque of MRG brake. Consequently, the utilization of dilution oil in MRG could be considered in MR brake in near future.
This study discusses the design of the MIMO microstrip antenna which is implemented in a 5G communication system that works on the N40 frequency band (2.3-2.4 GHz) with the center frequency of 2.35 GHz. The parameters that are unique of this antenna is focusing on the mutual coupling and correlation of MIMO antennas. The MIMO configuration was chosen because it can meet the high data transmission needs of 5G communication systems. The antenna is composed of a square patch with a microstrip insert feed-line technique. Then, the substrate uses FR-4 material, with a dielectric constant value of 4.3. After the design of a single element antenna that works according to the criteria is obtained, then the antenna is arranged into a configuration of 4 parallel elements, a 2×2 MIMO configuration with uniform polarization, and a 2×2 MIMO configuration with non-uniform polarization. After the design process, the antenna design is fabricated and then measured using a Vector Network Analyzer (VNA). The analysed antenna parameters are return loss, mutual coupling, Voltage Standing Wave Ratio (VSWR), bandwidth, and radiation pattern. From the element measurement results, it is found that the return loss is -11.24 dB and the bandwidth is 70 MHz at the center frequency of 2.35 GHz. As for the analysis of mutual coupling between elements, the best results were obtained from the MIMO configuration of 2×2 non-uniform polarization with values -20 dB for all elements. The antenna measurement results obtained indicate a similarity with the simulation results. This result is suitable for MIMO applications that require very low mutual coupling and correlation between elements.
Powders of lithium iron phosphate (LFP) with Cu doping and carbon coating were prepared by a dissolution method using Fe sourced from natural ironstone. Two dopant amounts were used, 2 and 3 at.% while the carbon coating used carbonization with 9 wt.% citric acid. Synchrotron X-ray diffraction (XRD), Fe K-edge X-ray absorption spectroscopy (XAS), and scanning electron microscopy (SEM) were used to reveal the crystal and local structures and grain morphology of the formed phase. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and charge–discharge (CD) measurements were carried out to determine the electrical properties of the samples. According to the XRD and XAS data, LFP was the main phase in all samples with Fe coordination number 6 and an oxidation number of 2+. Small amounts of hematite were detected in the doped and carbonized samples. SEM images of the 2 and 3 at.% Cu-doped samples showed a spherical morphology with clear grain boundaries, whereas carbonization resulted in smaller grain sizes. XAS analysis showed that Cu doping increased the distance between Fe as the absorbing atom and its nearest-neighbor atoms, while carbon coating reduced it. The EIS and CD tests showed that Cu doping and carbonization increased the conductivity up to 10 times and the specific capacity up to 50 times for the undoped and uncarbonized samples. The CV curves showed that Cu doping and carbonization provided better intercalation, deintercalation, and reversibility properties of LFP as shown by the smallest potential difference at a value as low as 0.2 V. The changes in the electrical properties are explained in terms of the LFP structures.
Background: The education system has shifted from traditional to online during the COVID-19 pandemic. Thus, the Learning Management System (LMS) is one of the most important and comprehensive learning platforms that support and facilitate online learning during this pandemic. Objective: This study explored the perceived system usability of LMS during the COVID-19 pandemic by utilizing Technology Acceptance Model (TAM), Task-technology Fit (TTF), and System Usability Scale (SUS). Methods: An online survey was utilized to collect data from 502 Filipino students from different academic institutions and different areas of study. Results: Structural Equation Modeling (SEM) indicated that students' perceived ease of use of LMS had a significant effect on perceived usefulness which subsequently and positively led to students' perceived satisfaction of LMS. In addition, LMS technology characteristics was found to have a significant effect on LMS task-technology fit which subsequently led to perceived usefulness and perceived satisfaction. Interestingly, perceived satisfaction was found to have a significant effect on students' perceived system usability of LMS which was calculated using a system usability scale (SUS). Conclusion: The findings have implications within the education system globally, particularly in recognizing the relevance of LMS moving forward. Furthermore, since this is the first study that integrated SUS, TAM, and TFF, the conceptual framework can be utilized to evaluate the perceived usability of LMS worldwide.
ABSTRAK Microgreen merupakan sayuran muda yang lebih kaya akan gizi jika dibandingkan dengan sayuran dewasa. Sayuran ini dibudidayakan dengan waktu yang cepat sekitar 10 – 14 hari setelah proses pembibitan. Masa yang cepat ini menuntut pemeliharaan yang baik. Kebutuhan ini mendorong penelitian tentang perangkat budidaya microgreen yang mampu mengontrol kelembapan dan intensitas cahaya. Penelitian ini bertujuan untuk membuat media sarana perangkat budidaya microgreen berbasis Internet of Things. Perangkat ini memberikan hasil yang baik dengan nilai akurasi pada pembacaan kelembapan 15% 30%, 60%, 80%, dan 90% masing-masing sebesar 93,47%, 96,29%, 98,83%, 97,08%, dan 99,05%. Sedangkan akurasi pada pembacaan intensitas cahaya pada jarak 10 cm dan 15 cm masing-masing sebesar 99,98% dan 99,85%. Waktu tunda yang dibutuhkan untuk mengirim ke IoT platform adalah 0,5 – 2 s. Perangkat ini mampu membaca parameter dengan baik dan dikirimkan ke cloud Antares. Kata kunci: microgreen, sayuran, Internet of Things, akurasi, kelembapan media ABSTRACT Microgreens are young vegetables but more nutritious compared to mature vegetables. Microgreens are cultivated with a fast time period around 10-14 days after the seeding process. This fast period requires good maintenance by keeping the media moist and light requirements on microgreens. This need encourages research on microgreen cultivation devices that are able to control humidity and light intensity. This study aims to create a microgreen cultivation device based on the Internet of Things. This device gives good results with accuracy values at 15%, 30%, 60%, 80%, dan 90% humidity readings of 93,47%, 96,29%, 98,83% 97,08%, and 99,05% respectively. Meanwhile, the accuracy in light intensity reading at a distance of 10 cm and 15 cm is 99,98% and 99,85%, respectively. The delay time required to send to the IoT platform is 0,5 – 2 s. This device is can read all parameter and send it to Antares IoT platform. Keywords: microgreen, vegetable, Internet of Things, accuracy, soil moisture
Avian influenza subtype A/H9N2—which infects chickens, reducing egg production by up to 80%—may be transmissible to humans. In humans, this virus is very harmful since it attacks the respiratory system and reproductive tract, replicating in both. Previous attempts to find antiviral candidates capable of inhibiting influenza A/H9N2 transmission were unsuccessful. This study aims to better characterize A/H9N2 to facilitate the discovery of antiviral compounds capable of inhibiting its transmission. The Symmetry of this study is to apply several machine learning methods to perform virtual screening to identify H9N2 antivirus candidates. The parameters used to measure the machine learning model’s quality included accuracy, sensitivity, specificity, balanced accuracy, and receiver operating characteristic score. We found that the extreme gradient boosting method yielded better results in classifying compounds predicted to be suitable antiviral compounds than six other machine learning methods, including logistic regression, k-nearest neighbor analysis, support vector machine, multilayer perceptron, random forest, and gradient boosting. Using this algorithm, we identified 10 candidate synthetic compounds with the highest scores. These high scores predicted that the molecular fingerprint may involve strong bonding characteristics. Thus, we were able to find significant candidates for synthetic H9N2 antivirus compounds and identify the best machine learning method to perform virtual screenings.
MSMEs have an important role in sustaining the national economy as it contributes about 60 percent of GDP. On the other hand, however, the expansion of their business is considerably low. According to an economic survey by BPS in 2016, more than 63.72 percent of MSMEs had no plan to develop their business for various reasons. In addition, the Covid-19 pandemic has turned their business increasingly sluggish, because the demand for their product sales has decreased drastically. The purpose of this community service is to empower and strengthen the business management of MSME, particularly in the crafting industry i.e. Az Zahra Creation located in Surabaya. Specifically, the program focuses on the understanding of MSMEs mindsets and improving their capability in business and financial management. The methods carried out are identifying and mapping their problems through direct observation and interviews, formulating the solution using system thinking which is then actualized in mentoring and training programs. The results of the programs are renovating the workshop room, improving MSME partners’ knowledge and skills in planning, innovation of business model, managerial, and financial management. The impact of this program is expected to exemplify for other similar MSMEs, hence, the developed framework could be adopted by others to assist the business development.
Electronic nose (e-nose) systems have been reported to be used in many areas as rapid, low-cost, and non-invasive instruments. Especially in meat production and processing, e-nose system is a powerful tool to process volatile compounds as a unique ‘fingerprint’. The ability of the pattern recognition algorithm to analyze e-nose signals is the key to the success of the e-nose system in many applications. On the other hand, ensemble methods have been reported for favorable performances in various data sets. This research proposes an ensemble learning approach for e-nose signal processing, especially in beef quality assessment. Ensemble methods are not only used for learning algorithms but also sensor array optimization. For sensor array optimization, three filter-based feature selection algorithms (FSAs) are used to build ensemble FSA such as reliefF, chi-square, and gini index. Ensemble FSA is developed to deal with different or unstable outputs of a single FSA on homogeneous e-nose data sets in beef quality monitoring. Moreover, ensemble learning algorithms are employed to deal with multi-class classification and regression tasks. Random forest and Adaboost are used that represent bagging and boosting algorithms, respectively. The results are also compared with support vector machine and decision tree as single learners. According to the experimental results, our ensemble approach has good performance and generalization in e-nose signal processing. Optimized sensor combination based on filter-based FSA shows stable results both in classification and regression tasks. Furthermore, Adaboost as a boosting algorithm produces the best prediction even though using a smaller number of sensors.
Academic Information System is a tool to support academic activities in implementing education in institutions effectively and efficiently. Institut Teknologi Telkom Surabaya is an institution that already has an integrated academic information system called I-Gracias. I-Gracias uses a single-user system for all applications. Most users of I-Gracias are students, so student satisfaction with integrated academic information system services can be used as benchmarks in determining I-Gracias improvement plans. One method used for the I-Gracias improvement process is the Quality Function Deployment (QFD) method. This method determines the student's desire for I-Gracias using the House of Quality (HOQ) matrix. The result of this research is that the QFD method can prioritize technical responses to the main obstacles for students in using I-Gracias by correlating Voice of Consumer (VOC) and technical response. The highest priority for technical response is coordinating with other units with a technical importance rating of 620.9 and a relative weight value of 21%. Next is to update the module regularly, socialize i-Gracias, meet management targets, receive criticism and suggestions, carry out regular checks and recruit HR if needed as a sequence of improvements to i-Gracias.
This study provides a holistic view of the acceptance of collaborative robots (cobots) in the manufacturing context by adopting the socio-technical perspective to the Industry 5.0 era. Grounding on the Unified Theory of Acceptance and Use of Technology (UTAUT) and Socio-Technical Systems theory (STS), this study proposes a conceptual model to better understanding critical factors that influence the acceptance of cobots and how these factors can drive perceived work performance improvement in the organizational level. This study was conducted by catching the critical issue, reviewing the literature on the subject of this study, identifying previous research gaps, and subsequently developing constructs of the model. As a result, this study offers valuable contributions to robotics and manufacturing literature and further suggests empirical research to generally examine and validate the conceptual model.
Kegiatan pengabdian masyarakat ini adalah memberikan workbench untuk kegiatan Bank Sampah di Kelurahan Bulaksari. Para Ibu rumah tangga di beberapa Rukun Tetangga (RT) melakukan pengelolaan sampah Air Minum Dalam Kemasan (AMDK) dengan melakukan sortir, pembersihan sampah dan pengarungan. Namun, didapati kondisi selama proses sortir sampah, tidak ergonomis, dimana para ibu rumah tangga ini melakukan kegiatan tersebut tidak dengan menggunakan alat bantu yang layak dan dengan posisi duduk membungkuk. Implikasi kegiatan pengabdian masyarakat terbagi ke beberapa kegiatan, pertama adalah mengadakan sosialisasi terkait kegiatan pengelolaan sampah dan itikad untuk membantu kegiatan tersebut. Kemudian dilanjutkan dengan pembuatan ergonomic workbench, dimana alat bantu ini dapat memberikan kenyamanan dan keamanan saat bekerja karena didesain dengan mengakomodir prinsip perancangan metode kerja dan produk, Terakhir adalah dengan melakukan trial produk versi pertama untuk mendapatkan masukan dalam pengembangan produk versi kedua. Kata kunci: sampah plastik, air minum dalam kemasan, alat kerja, ergonomis, bank sampah ABSTRACT This community service is to provide a workbench for garbage bank activites in Bulaksari Village. Housewives in several Neighborhood Communities (RT) manage Bottle Drinking Water (AMDK) waste by sorting, cleaning and rafting in a sack. However, it was found that the conditions during the waste sorting process were not ergonomic, where these housewives did not use proper tools and bent sitting position. The implication of community service activities are divided into several activities, first is holding socialization related to waste management activities and the intention to help these activities. Then proceed with the manufacture of an ergonomic workbench, where this tool can provide comfort and safety while working because it is designed to accommodate the principles of ergonomics designing work products. Keywords: plastic waste, bottled mineral drinking water, workbench, ergonomics, waste bank
Recently, fast, inexpensive, environmentally friendly, sustainable remediation of low‐permeability soils, sludge, and sediment (SSS) is being studied by researchers. Electrokinetic treatment promotes the efficient remediation of metal‐contaminated SSS. A low electrical field applied during electrokinetic treatment causes ion migration that brings metals or colloidal ions attached to SSS particle surfaces to the oppositely charged electrode. However, electrokinetic treatment may eliminate nonionic contaminants slowly. Cavitation and vibration as part of ultrasonication can support electrokinetic treatment to release nonionic pollutants from particle surfaces. Then, electrokinetic treatment transports the contaminants through soil pores using electromotive force. This chapter discusses the potential use of this integrative remediation technique along with the fundamental process, critical factors, and a success story on the lab and pilot scales. This chapter complements the growing field of study of ultrasound‐assisted electrokinetic treatment.
This paper reports, for the first time, the formation of colloidal NiPt nanoparticles (NPs) by ultrafast laser-based synthesis under two schemes: (1) ablation of colloidal Ni and Pt nanoparticles mixed in a fixed volume ratio, and (2) ablation of Ni targets immersed in H2PtCl6 · 6H2O in the presence of PVP as a dispersing agent. The generated nanoparticles were characterized using UV-Vis absorption spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD). It was found that the two schemes resulted in the different nanostructures: alloy nanoparticle for scheme 1 and core-shell structure for scheme 2. The findings have broadened the application of this method in fabrication of various types’ nanoparticles in various nanostructures.
Various LiFePO4 (LFP) powders with natural ironstone as a base material were prepared using the dissolution method. They were synthesised using different (a) calcination temperatures, (b) milling times, and (c) Cu doping concentrations. X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) were conducted to determine the purity, grain and crystallite morphology, and crystalline and local structure of the phases formed, respectively. According to the XRD data, LFP can be produced using the aforementioned variations, and no other phases were found. The TEM images showed that the LFP size can be reduced from 200 nm to 60 nm by milling. The SEM images confirmed the nanometric characteristics of the milled powder and also the effect of calcination temperature on growing the particle sizes. The EDX analysis further reinforced that the samples’ atomic fractions were relatively compatible with LFP to explain the synthesised products’ purity. Analysis of the Fe K-edge XANES data showed that the samples’ oxidation number of Fe for all samples was 2+ with 6 coordination numbers, which corresponded to the oxidation and coordination number of Fe in LFP. The EXAFS Fe K-edge analysis demonstrated that slightly increasing the temperature increased the distance between the absorbing Fe atom and its nearest neighbouring atom but milling reduced it. The XAS analyses, therefore, confirm that all synthesized samples contain only LFP. A preliminary electro-chemistry test showed that these materials are promising candidates for cathodes in LFP-based batteries.
When firefighters extinguish a fire there are certain points that are difficult to pass, while the speed of extinguishing the fire is important. Therefore, the existence of a UAV (Unmanned Aerial Vehicle) that can easily reach the area is very important to help the firefighters. Then the extinguisher used to extinguish must also be specially designed because the ability to carry the robot's UAV (Unmanned Aerial Vehicle) is limited. The flying robot UAV (Unmanned Aerial Vehicle) design used is a multicopter robot. Multicopter which is designed to have 6 propellers. Specially designed extinguisher is also designed to be able to extinguish the fire efficiently with the designed multicopter. The extinguisher is designed in the form of an inverted umbrella with the fabric of the umbrella using a fire extinguisher or a fire-resistant cloth. With this system design, the robot UAV is very efficient to use to extinguish fire in the form of a multicopter. The extinguisher designed has succeeded 100% in extinguishing the fire with an average time of 5 seconds, while when using water the fire is extinguished in an average time of 37.5 seconds. Keywords : UAV, Robot, Fire fighting,Mmulticopter, Extinguisher. Abstrak Pada saat petugas pemadam api melakukan pemadaman api terdapat beberapa titik tertentu yang sulit dilalui, sedangkan kecepatan dalam pemadaman adalah yang penting. Oleh sebab itu adanya UAV (Unmanned Aerial Vehicle) yang dapat dengan mudah menjangkau daerah tersebut sangatlah penting untuk membantu para pemadam. Kemudian alat pemadam yang digunakan untuk memadamkan juga harus dirancang khusus karena kemampuan angkut UAV (Unmanned Aerial Vehicle) robot terbatas. Desain UAV (Unmanned Aerial Vehicle) robot terbang yang digunakan adalah berbentuk multicopter robot. Multicopter yang didesain memiliki 6 baling-baling. Kemudan alat pemadam yang dirancang juga dirancang khusus agar dapat memadamkan api dengan efisien dengan multicopter yang telah didesain. Alat pemadam yang dirancang berupa payung terbalik yang bagian kaiin payung menggunakan kain pemadam atau kain tahan api yang biasa digunakan untuk memadamkan api. Dengan desain sistem tersebut maka UAV robot sangat efisien digunakan untuk memadamkan api dalam bentuk multicopter. Alat pemadam yang dirancang telah berhasil 100% memadamkan api dengan rata-rata waktu 5 detik, sedangkan bila menggunakan air maka api padam dalam waktu rata-rata 37.5 detik. Kata Kunci : UAV, Robot, Pemadam kebakaran, Multicopter, Alat pemadam.
The college selection process is an important phase because this process affects the future achievement targets of prospective students. One of the factors that is considered in determining a university is the supporting facilities provided during the lecture process. prospective students will continue to search and at the same time consider universities despite the pandemic COVID-19. By implementing 3600 photo-based virtual reality (VR), prospective students or external parties can get information about university facilities anytime and anywhere because it can be accessed online. This study uses the Multimedia Development Life Cycle (MDLC) method in application development, then uses a quantitative approach to test the feasibility of the application. The results showed that 3600 photo-based virtual reality (VR) is an alternative media in conveying information related to the facilities and logistics owned by universities, the variables of smoothness and convenience of operating 3600 photo-based videos have a high enough influence, but on user motivation to use VR is worth less. This happens because users are not used to using this technology.
The complications of ventriculoperitoneal (VP) shunts are many and are reported in literature extensively. The complication of transanal extrusion after bowel perforation is known although rare. This complication is very well described amongst the children. The authors describe the case of bowel perforation and transanal extrusion of a VP shunt occurring in a 51-year-old adult patient. The patient has a history of craniotomy for acute subdural hematoma after severe head injury one year ago continued with VP shunt for post-traumatic hydrocephalus. Home care with bedridden conditions is done at home until finally, the family gets the catheter extrude from the transanal. Bowel perforation and transanal extrusion of VP shunt catheter is a rare but serious problem. The exact pathogenesis of shunt-related organ perforation and extrusion through the anus is unclear, and various mechanisms have been suggested, Among many factors, age is the prominent factor for bowel perforation.1 Because of weak bowel musculature and stronger peristaltic activity, children are more susceptible to bowel perforation than adult patients. In adult shunted patient, one of the risk factors is related to PVS with chronic immobilization, as described in this case. Risk factors of bowel perforation in adult are quite distinct from children. Persistent vegetative state (PVS) with chronic immobilization is one of the risk factors to be aware of.
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35 members
Abduh Sayid Albana
  • Department of Industrial Engineering
Farah Zakiyah Rahmanti
  • Information Technology
Wahyu Andy Prastyabudi
  • Department of Industrial Engineering
Muhammad Nasrullah
  • Department of Information System
Benazir Imam Arif Muttaqin
  • Department of Industrial Engineering
Information
Address
Jl. Gayungan PTT no. 17-19, 60234, Surabaya, East Java, Indonesia
Head of institution
Dwi Sasongko Purnomo
Website
https://www.ittelkom-sby.ac.id/
Phone
+62-31-8280800