19 results on '"Tjoa E"'
Search Results
2. The use of CLAHE for improving an accuracy of CNN architecture for detecting pneumonia
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Tjoa Elbert Alfredo, Yowan Nugraha Suparta I Putu, Magdalena Rita, and Kumalasari CP Nor
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Social Sciences - Abstract
Artificial intelligence (AI) has now grown rapidly for helping many aspects of human life, one of them is for medical image processing. Currently, the world is still suffering from COVID-19 pandemic outbreak which affects more than 36 million people and it is estimated that more than 1 million death occurred as a result of this outbreak. Early detection for COVID-19 suffers is needed to assist doctors and medical experts to determine the next medication for patients for avoiding the worsening condition which leads to death. AI-based model is can be used for assisting medical experts for detecting and classify the lung condition based on chest x-ray (CXR) patient‗s image accurately by using deep learning. On this paper, authors proposed the use on contrast limited adaptive histogram equalization (CLAHE) for pre-processing the medical images combined with CNN AlexNet architecture. The result of this method then compared with non-CLAHE CNN AlexNet also self-made CNN architecture. The result shows a promising result by the accuracy of CNN AlexNet architecture is 91.11%.
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- 2022
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3. Shortened persistent homology for a biomedical retrieval system with relevance feedback
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Massimo Ferri, Ivan Tomba, Eleonora Monti, Alessia Angeli, A. Holzinger, P. Kieseberg, A. Tjoa, E. Weippl, Angeli, Alessia, Ferri, Massimo, Monti Eleonora, Tomba, Ivan, Department of Mathematics [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Advanced Research Center on Electronic Systems for Information and Communication Technologies E. De Castro [Bologna] (ARCES), CA-MI S.r.l., Andreas Holzinger, Peter Kieseberg, A Min Tjoa, Edgar Weippl, TC 5, TC 8, TC 12, WG 8.4, WG 8.9, and WG 12.9
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Elementary symmetric function ,MAT/03 Geometria ,Theoretical computer science ,Persistent homology ,Computer science ,[SHS.INFO]Humanities and Social Sciences/Library and information sciences ,Relevance feedback ,Persistence diagram ,020207 software engineering ,02 engineering and technology ,Projected gradient ,{Persistence diagram ,Persistence diagram, Elementary symmetric function, Projected gradient ,0202 electrical engineering, electronic engineering, information engineering ,Elementary symmetric polynomial ,020201 artificial intelligence & image processing ,[INFO]Computer Science [cs] ,Complex quadratic polynomial ,Coding (social sciences) - Abstract
Part 4: MAKE-Topology; International audience; This is the report of a preliminary study, in which a new coding of persistence diagrams and two relevance feedback methods, designed for use with persistent homology, are combined. The coding consists in substituting persistence diagrams with complex polynomials; these are “shortened”, in the sense that only the first few coefficients are used. The relevance feedback methods play on the user’s feedback for changing the impact of the different filtering functions in determining the output.
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- 2018
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4. On a new method to build group equivariant operators by means of permutants
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Patrizio Frosini, Francesco Camporesi, Nicola Quercioli, A. Holzinger, P. Kieseberg, AM. Tjoa, E. Weippl, Camporesi, Francesco, Frosini, Patrizio, Quercioli, Nicola, Dipartimento di Matematica [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Andreas Holzinger, Peter Kieseberg, A Min Tjoa, Edgar Weippl, TC 5, TC 8, TC 12, WG 8.4, WG 8.9, and WG 12.9
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[SHS.INFO]Humanities and Social Sciences/Library and information sciences ,Persistent homology group ,Topological data analysis ,02 engineering and technology ,Topological space ,Natural pseudo-distance ,01 natural sciences ,Theoretical Computer Science ,Set (abstract data type) ,Filtering function ,020204 information systems ,0202 electrical engineering, electronic engineering, information engineering ,[INFO]Computer Science [cs] ,Topological data analysi ,0101 mathematics ,Mathematics ,Discrete mathematics ,Mathematics::Functional Analysis ,Group (mathematics) ,010102 general mathematics ,Computer Science (all) ,Group action ,Bounded function ,Equivariant map ,Group equivariant non-expansive operator - Abstract
Part 4: MAKE-Topology; International audience; The use of group equivariant operators is becoming more and more important in machine learning and topological data analysis. In this paper we introduce a new method to build G-equivariant non-expansive operators from a set $$\varPhi $$ of bounded and continuous functions $$\varphi :X\rightarrow \mathbb {R}$$ to $$\varPhi $$ itself, where X is a topological space and G is a subgroup of the group of all self-homeomorphisms of X.
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- 2018
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5. Effectiveness of Narrative Exposure Therapy for Treatment of PTSD Following Childhood Trauma: A Single-Case Series Design.
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Hoeboer C, Wienen L, Smiddy M, van der Werff S, Maric M, Tjoa E, Timmers L, and Schoorl M
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- Humans, Male, Female, Adult, Treatment Outcome, Quality of Life psychology, Middle Aged, Surveys and Questionnaires, Stress Disorders, Post-Traumatic therapy, Stress Disorders, Post-Traumatic psychology, Implosive Therapy methods, Narrative Therapy methods
- Abstract
Background: Narrative exposure therapy (NET) has shown promising outcomes for treating posttraumatic stress disorder (PTSD) in refugees and veterans. Its effectiveness in patients with PTSD following childhood trauma is, however, still unknown., Aims: We investigated whether NET is an effective treatment for patients with PTSD following childhood trauma., Method: We studied treatment outcomes of nine adult patients in an outpatient setting. An AB single-case series design was used with a baseline of 4 weeks prior to treatment. Participants filled in weekly online questionnaires to assess their PTSD symptoms (using the Posttraumatic Diagnostic Scale [PDS]) and their experienced quality of life (using the Manchester Short Assessment of Quality of Life [MANSA]). Data were analysed visually and using a mixed-effect model., Results: Results revealed no significant reduction of PTSD symptoms during NET treatment, nor an increase in quality of life, as compared to baseline., Conclusions: The results of our study do not underscore the effectiveness of NET treatment for patients with PTSD following childhood trauma. Further research is needed to study the effectiveness of NET in this population., (© 2024 The Author(s). Clinical Psychology & Psychotherapy published by John Wiley & Sons Ltd.)
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- 2024
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6. Comprehensive overview of the anesthesiology research landscape: A machine Learning Analysis of 737 NIH-funded anesthesiology primary Investigator's publication trends.
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Ghanem M, Espinosa C, Chung P, Reincke M, Harrison N, Phongpreecha T, Shome S, Saarunya G, Berson E, James T, Xie F, Shu CH, Hazra D, Mataraso S, Kim Y, Seong D, Chakraborty D, Studer M, Xue L, Marić I, Chang AL, Tjoa E, Gaudillière B, Tawfik VL, Mackey S, and Aghaeepour N
- Abstract
Background: Anesthesiology plays a crucial role in perioperative care, critical care, and pain management, impacting patient experiences and clinical outcomes. However, our understanding of the anesthesiology research landscape is limited. Accordingly, we initiated a data-driven analysis through topic modeling to uncover research trends, enabling informed decision-making and fostering progress within the field., Methods: The easyPubMed R package was used to collect 32,300 PubMed abstracts spanning from 2000 to 2022. These abstracts were authored by 737 Anesthesiology Principal Investigators (PIs) who were recipients of National Institute of Health (NIH) funding from 2010 to 2022. Abstracts were preprocessed, vectorized, and analyzed with the state-of-the-art BERTopic algorithm to identify pillar topics and trending subtopics within anesthesiology research. Temporal trends were assessed using the Mann-Kendall test., Results: The publishing journals with most abstracts in this dataset were Anesthesia & Analgesia 1133, Anesthesiology 992, and Pain 671. Eight pillar topics were identified and categorized as basic or clinical sciences based on a hierarchical clustering analysis. Amongst the pillar topics, "Cells & Proteomics" had both the highest annual and total number of abstracts. Interestingly, there was an overall upward trend for all topics spanning the years 2000-2022. However, when focusing on the period from 2015 to 2022, topics "Cells & Proteomics" and "Pulmonology" exhibit a downward trajectory. Additionally, various subtopics were identified, with notable increasing trends in "Aneurysms", "Covid 19 Pandemic", and "Artificial intelligence & Machine Learning"., Conclusion: Our work offers a comprehensive analysis of the anesthesiology research landscape by providing insights into pillar topics, and trending subtopics. These findings contribute to a better understanding of anesthesiology research and can guide future directions., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)
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- 2024
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7. Antibacterial activity of Lagerstreomia speciosa and its active compound, corosolic acid, enhances cefotaxime inhibitory activity against Staphylococcus aureus.
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Sinelius S, Lady J, Yunardy M, Tjoa E, and Nurcahyanti ADR
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- Humans, Staphylococcus aureus, Cefotaxime pharmacology, Pandemics, Anti-Bacterial Agents pharmacology, Plant Extracts pharmacology, Microbial Sensitivity Tests, Drug Synergism, Methicillin-Resistant Staphylococcus aureus, COVID-19, Staphylococcal Infections drug therapy
- Abstract
Aims: Various epidemiology studies have reported the emergence of Staphylococcus aureus and its methicillin resistance strain causing global health concerns, especially during and post-COVID-19 pandemic. This pathogen presents as a co-infection in patients with COVID-19. In addition, certain virulence factors and resistance to β-lactam antibiotics, including cefotaxime, have been identified. We aimed to investigate the antibacterial activity of Lagerstreomia speciosa, a medicinal plant with antidiabetic activity, against S. aureus, including the strain resistant to methicillin. Furthermore, we examined whether the extract and one of its bioactive compounds, corosolic acid, can enhance the therapeutic effect of cefotaxime on antibiotic-resistant S. aureus., Methods and Results: The minimum inhibitory concentration of each substance was determined using the standard broth microdilution test following the checkerboard dilution. The type of interactions, synergistic, additivity, indifference, or antagonism, were determined using isobolograms analysis and the dose reduction index (DRI). The evaluation of synergy and bactericidal activity of the natural products in combination with cefotaxime was performed using the time-kill kinetic assay. Corosolic acid, L. speciosa leaves extract, and bark extract alone showed antibacterial activity against all tested S. aureus ATCC 33591, S. aureus ATCC 29213, S. aureus ATCC 25923, and clinical isolated S. aureus. Corosolic acid enhanced the antibacterial activity of cefotaxime, showing a synergistic effect and greater DRI of cefotaxime against all tested S. aureus strains. Time-kill kinetic assay showed that corosolic acid has a more profound effect than L. speciosa extracts to potentiate the bactericidal activity of cefotaxime. Whereas L. speciosa leaves and bark extract showed some inhibitory effect on the growth of S. aureus after a single administration., Conclusions: Lagerstreomia speciosa leaves and bark extract and its active compound, corosolic acid, could be used as a potential anti-Staphylococcus aureus treatment to enhance the therapeutic use of cefotaxime., (© The Author(s) 2023. Published by Oxford University Press on behalf of Applied Microbiology International.)
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- 2023
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8. Synergistic Effect and Time-Kill Evaluation of Eugenol Combined with Cefotaxime Against Staphylococcus aureus.
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Lady J, Nurcahyanti ADR, and Tjoa E
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- Humans, Cefotaxime pharmacology, Staphylococcus aureus, Eugenol pharmacology, Anti-Bacterial Agents pharmacology, Methicillin-Resistant Staphylococcus aureus, Staphylococcal Infections drug therapy
- Abstract
Eugenol, a clove-derived aromatic compound has shown antibacterial activity against many species, including Staphylococcus aureus. Epidemiology studies from the past two decades reported an increased number of healthcare-associated and skin tissue infections due to S. aureus antimicrobial resistance (AMR) including several cases of resistance to β-lactam antibiotics, such as cefotaxime. We aimed to investigate whether eugenol can cause lethality of S. aureus including the strain resistant to methicillin and the wild strain isolated from a hospital patient. Moreover, we asked whether eugenol could enhance the therapeutic effect of cefotaxime, one of the most prescribed 3rd generation cephalosporin β-lactam antibiotics, of which S. aureus resistance to this antibiotic has emerged. The minimum inhibitory concentration (MIC) of each substance was determined using the standard broth microdilution test following the combination experiment performed using checkerboard dilution. The type of interactions, including synergistic and additivity, was determined using isobologram analysis, and the dose reduction index (DRI) was calculated. The time-kill kinetic assay was performed to evaluate the dynamic bactericidal activity of eugenol alone and in combination with cefotaxime. We showed that eugenol alone is bactericidal against S. aureus ATCC 33591 and the clinical isolate. Eugenol combined with cefotaxime resulted synergistic effect against S. aureus ATCC 33591, ATCC 29213, and ATCC 25923. Eugenol may be capable to improve the therapeutic effect of cefotaxime against methicillin-resistant S. aureus (MRSA)., (© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
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- 2023
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9. Self reward design with fine-grained interpretability.
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Tjoa E and Guan C
- Abstract
The black-box nature of deep neural networks (DNN) has brought to attention the issues of transparency and fairness. Deep Reinforcement Learning (Deep RL or DRL), which uses DNN to learn its policy, value functions etc, is thus also subject to similar concerns. This paper proposes a way to circumvent the issues through the bottom-up design of neural networks with detailed interpretability, where each neuron or layer has its own meaning and utility that corresponds to humanly understandable concept. The framework introduced in this paper is called the Self Reward Design (SRD), inspired by the Inverse Reward Design, and this interpretable design can (1) solve the problem by pure design (although imperfectly) and (2) be optimized like a standard DNN. With deliberate human designs, we show that some RL problems such as lavaland and MuJoCo can be solved using a model constructed with standard NN components with few parameters. Furthermore, with our fish sale auction example, we demonstrate how SRD is used to address situations that will not make sense if black-box models are used, where humanly-understandable semantic-based decision is required., (© 2023. The Author(s).)
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- 2023
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10. Hotspots sequences of gyrA, gyrB, parC, and parE genes encoded for fluoroquinolones resistance from local Salmonella Typhi strains in Jakarta.
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Nathania I, Nainggolan IM, Yasmon A, Nusatia ACM, Tjoa E, Gunardi WD, and Moehario LH
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- Amino Acids, Anti-Bacterial Agents pharmacology, Anti-Bacterial Agents therapeutic use, Ciprofloxacin pharmacology, DNA Gyrase genetics, DNA Topoisomerase IV genetics, Drug Resistance, Bacterial genetics, Fluoroquinolones pharmacology, Humans, Levofloxacin, Microbial Sensitivity Tests, Moxifloxacin, Nalidixic Acid, Salmonella, Salmonella typhi, Quinolones, Salmonella enterica, Typhoid Fever
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Background: Infection of Salmonella enterica subsp. enterica serovar Typhi is the primary etiology of typhoid fever globally and is common in many developing countries, especially those with dense populations and poor environmental sanitation. Antibiotic fluoroquinolones were used for the treatment in the 1980s due to the resistance to the first-line antibiotics. However, many cases of treatment failure of fluoroquinolones in typhoidal patients have been reported from numerous countries in Asia, Europe, Africa, and America. Mutations in quinolone resistance determining regions (QRDR) genes, gyrA, gyrB, parC, and parE, are found in fluoroquinolone-resistant Salmonella Typhi. Contrast reports came from the S. Typhi isolates in Indonesia, mainly Jakarta and the surroundings, obtained from patients with typhoid fever, with good sensitivity to the fluoroquinolones, i.e., nalidixic acid, ciprofloxacin, moxifloxacin, and levofloxacin. The present study, therefore, aimed to identify the hotspot sequences of gyrA, gyrB, parC, and parE genes of the local S. Typhi strains based on their susceptibility to fluoroquinolones from patients with typhoid fever in Jakarta and its satellite cities., Results: A total of 28 isolates were identified as S. Typhi. All isolates were susceptible to nalidixic acid, levofloxacin, and moxifloxacin. Twenty-seven isolates (96.4%) were susceptible to ciprofloxacin, with one isolate (3.6%) being intermediate. The hotspot sequences of gyrA, gyrB, parC, and parE genes from all isolates were identical to the fluoroquinolone-sensitive reference sequence Salmonella enterica subsp. enterica serovar Typhi Ty2 (NCBI GenBank AE014613.1), including the isolate with intermediate susceptibility. The mutation was not found, and amino acid deduced from all hotspots in susceptible and intermediate isolates showed no replacement in all reported codons., Conclusions: This study showed that the local S. Typhi strains from Jakarta and surroundings were susceptible to fluoroquinolones (nalidixic acid, ciprofloxacin, levofloxacin, and moxifloxacin), and the hotspot sequences of the gyrA, gyrB, parC, and parE genes were all identical to the reference sequence. Thus, the hotspot sequences of the gyrA, gyrB, parC, and parE genes seemingly were conserved in Jakarta's local S. Typhi strains and could be considered wild type. The phenotypic susceptibility was consistent with the genotypic characteristic without non-synonymous mutations associated with drug resistance., (© 2022. The Author(s).)
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- 2022
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11. Identification of Mycoplasma pneumoniae -associated pneumonia cases among hospitalized patients using CLART® microarray technology.
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Tjoa E, Joon S, Moehario LH, Loe L, and Pangalila FJV
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- Adult, Bacteria, Humans, Mycoplasma pneumoniae genetics, Prospective Studies, Technology, Community-Acquired Infections diagnosis, Pneumonia diagnosis, Pneumonia, Mycoplasma diagnosis
- Abstract
Objectives: Community-acquired pneumonia (CAP) is a global health condition that affects populations from all age groups. The laboratory identification of Mycoplasma pneumoniae as a causative agent of CAP is challenging because of its atypical and fastidious nature. Therefore, this study assessed the diagnostic potential of PneumoCLART bacteria® in identifying M. pneumoniae as a causative agent of pneumonia in hospitalized adults., Methods: This prospective study used a cross-sectional approach to assess the diagnostic potential of PneumoCLART bacteria® for detecting M. pneumoniae in sputum samples procured from 27 patients with pneumonia who required hospitalization., Results: The PneumoCLART bacteria® results illustrated that 7 of 27 patients with pneumonia were positive for M. pneumoniae (26%). However, the quality of sputum varied among the M. pneumoniae -positive and M. pneumoniae -negative samples. Fifty percent of the specimens obtained from patients positive for M. pneumoniae were saliva-contaminated and unsuitable for analysis., Conclusions: Because the leukocyte count was low and sputum specimens were saliva-contaminated, these findings require further validation to prove the utility of CLART® microarray technology for the identification of M. pneumoniae in pneumonia-positive patients. Conclusively, this prospective study included a small number of clinical samples, which likely affected its outcomes.
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- 2022
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12. Distribution of Carbapenemase Genes among Carbapenem-Non-Susceptible Acinetobacter baumanii Blood Isolates in Indonesia: A Multicenter Study.
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Anggraini D, Santosaningsih D, Saharman YR, Endraswari PD, Cahyarini C, Saptawati L, Hayati Z, Farida H, Siregar C, Pasaribu M, Homenta H, Tjoa E, Jasmin N, Sarassari R, Setyarini W, Hadi U, and Kuntaman K
- Abstract
Carbapenem non-susceptible Acinetobacter baumannii (CNSAB) is an important pathogen that causes nosocomial bacteremia among critically ill patients worldwide. The magnitude of antibiotic resistance of A. baumanii in Indonesia is expected to be significant; however, the data available are limited. The aim of this study was to analyze the genetic profiles of CNSAB isolates from patients with bacteremia in Indonesia. CNSAB isolates from blood cultures of bacteremia patients in 12 hospitals in Indonesia were included. The blood cultures were conducted using the BacT/Alert or BACTEC automated system. The CNSAB were identified with either Vitek 2 system or Phoenix platform followed by a confirmation test using a multiplex polymerase chain reaction (PCR) assay, targeting the specific gyrB gene. The carbapenemase genes were detected by multiplex PCR. In total, 110 CNSAB isolates were collected and were mostly resistant to nearly all antibiotic classes. The majority of CNSAB isolates were susceptible to tigecycline and trimethoprim-sulfamethoxazole (TMP-SMX), 45.5% and 38.2%, respectively. The bla
OXA-51-like gene was identified in all CNSAB isolates. Out of the total, 83.6% of CNSAB isolates had blaOXA-23-like gene, 37.3% blaOXA-24-like gene, 4.5% blaNDM-1 gene, 0.9% blaIMP-1 gene, and 0.9% blaVIM gene. No blaOXA-48-like gene was identified. The blaOXA-23-like gene was the predominant gene in all except two hospitals. The presence of the blaOXA-24-like gene was associated with resistance to tigecycline, amikacin, TMP-SMX and cefoperazone-sulbactam, while blaOXA-23-like gene was associated with resistance to TMP-SMX and cefoperazone-sulbactam. In conclusion, the blaOXA-23-like gene was the predominant gene among CNSAB isolates throughout Indonesia. A continuous national surveillance system needs to be established to further monitor the genetic profiles of CNSAB in Indonesia.- Published
- 2022
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13. A Survey on Explainable Artificial Intelligence (XAI): Toward Medical XAI.
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Tjoa E and Guan C
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- Artificial Intelligence trends, Humans, Image Processing, Computer-Assisted methods, Image Processing, Computer-Assisted trends, Pattern Recognition, Automated methods, Machine Learning trends, Neural Networks, Computer, Pattern Recognition, Automated trends, Surveys and Questionnaires
- Abstract
Recently, artificial intelligence and machine learning in general have demonstrated remarkable performances in many tasks, from image processing to natural language processing, especially with the advent of deep learning (DL). Along with research progress, they have encroached upon many different fields and disciplines. Some of them require high level of accountability and thus transparency, for example, the medical sector. Explanations for machine decisions and predictions are thus needed to justify their reliability. This requires greater interpretability, which often means we need to understand the mechanism underlying the algorithms. Unfortunately, the blackbox nature of the DL is still unresolved, and many machine decisions are still poorly understood. We provide a review on interpretabilities suggested by different research works and categorize them. The different categories show different dimensions in interpretability research, from approaches that provide "obviously" interpretable information to the studies of complex patterns. By applying the same categorization to interpretability in medical research, it is hoped that: 1) clinicians and practitioners can subsequently approach these methods with caution; 2) insight into interpretability will be born with more considerations for medical practices; and 3) initiatives to push forward data-based, mathematically grounded, and technically grounded medical education are encouraged.
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- 2021
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14. Diagnostic parameters of the AF Genital System® for detection of Mycoplasma hominis and Ureaplasma urealyticum .
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Tjoa E, Joon S, and Moehario LH
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- Female, Humans, Mycoplasma hominis genetics, Ureaplasma urealyticum genetics, Vagina, Mycoplasma Infections diagnosis, Ureaplasma Infections diagnosis
- Abstract
Objective: The prevalence of Mycoplasma hominis and Ureaplasma urealyticum (genital mycoplasma) amongst Indonesian women is poorly understood because of limited availability of diagnostic techniques. We sought to compare the diagnostic parameters of the AF Genital System® with those of culture methods and PCR as the gold standard for identification of M. hominis and U. urealyticum in vaginal swab specimens., Methods: This was an observational diagnostic study. Eighty-eight specimens were collected from patients with abnormal vaginal discharge. Detection of M. hominis and U. urealyticum was performed using the AF Genital System®, culture methods, and PCR., Results: Compared with PCR and culture methods, respectively, the AF Genital System® had sensitivities of 66.6% and 57% ( M. hominis ) and 55.5% and 77.8% ( U. urealyticum ). Compared with PCR and culture methods, respectively, the AF Genital System® had specificities of 82.9% and 86.5% ( M. hominis ) and 82.3% and 84.8% ( U. urealyticum )., Conclusion: The sensitivity of the AF Genital System® for detection of M. hominis and U. urealyticum from vaginal swab samples was lower than that of PCR, but specificity was reasonably good (82% to 83%).
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- 2021
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15. Wide Application of Minimally Processed Saliva on Multiple RT-qPCR Kits for SARS-CoV-2 Detection in Indonesia.
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Mahendra C, Kaisar MMM, Vasandani SR, Surja SS, Tjoa E, Chriestya F, Junusmin KI, Widowati TA, Irwanto A, and Ali S
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- Humans, Indonesia, Nasopharynx, RNA, Viral genetics, Saliva, Specimen Handling, COVID-19, SARS-CoV-2
- Abstract
Saliva as a sample matrix has been an attractive alternative for the detection of SARS-CoV-2. However, due to potential variability in collection and processing steps, evaluating a proposed workflow amongst the local population is recommended. Here, we aim to validate the collection and treatment of human saliva as a direct specimen for RT-qPCR-based detection of SARS-CoV-2 in Indonesia. We demonstrated that SARS-CoV-2 target genes were detected in saliva specimens and remained stable for five days either refrigerated or stored at room temperature. The method of processing saliva specimens described in this report bypasses the need for an RNA-extraction process, thereby reducing the cost, time, and manpower required for processing samples. The developed method was tested across nine commercial kits, including the benchmark, to demonstrate its wide applicability on multiple existing workflows. Our developed method achieved an 86% overall agreement rate compared to paired nasopharyngeal and oropharyngeal swab specimens (NPOP). With the assistance of a saliva sampling device, the collection was found to be more convenient for individuals and improved the overall agreement rate to 97%., Competing Interests: CM, SRV, KJ, and AI are employees of Nalagenetics Pte Ltd, Singapore, holding the trademark of QuickSpit™. AI has financial holdings in Nalagenetics Pte Ltd, Singapore. CM, MMMK, SRV, and SA have filed a patent (Patent application number: S00202103063) on the RNA-Extraction-free treatment of saliva specimens for SARS-CoV-2 diagnosis. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Mahendra, Kaisar, Vasandani, Surja, Tjoa, Chriestya, Junusmin, Widowati, Irwanto and Ali.)
- Published
- 2021
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16. Performance of TDR-300B and VITEK®2 for the identification of Pseudomonas aeruginosa in comparison with VITEK®-MS.
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Moehario LH, Tjoa E, Putranata H, Joon S, Edbert D, and Robertus T
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- Cross-Sectional Studies, Humans, Microbial Sensitivity Tests, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Gram-Negative Bacteria, Pseudomonas aeruginosa
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Objective: Automated systems are needed for the rapid and accurate diagnosis of Pseudomonas -associated nosocomial infections among critically ill patients admitted to the intensive care unit. We assessed the performance of TDR-300B and VITEK®2 for the identification of P. aeruginosa using VITEK®-MS as the gold standard., Methods: This analytical study employed a cross-sectional approach. First, 44 clinical isolates of P. aeruginosa were collected and refreshed. Next, a single colony of oxidase-positive, gram-negative rods (30 samples) was inoculated into a TDR-300B NF-64 card and VITEK®2 GN cassette for each isolate. Finally, bacterial identification was performed using VITEK®-MS for comparative analysis., Results: Compared with the results for VITEK®-MS, the congruence rates for TDR-300B and VITEK®2 were 80.76% (21/26) and 92.30% (24/26), respectively. Further, high sensitivity was observed for TDR-300B and VITEK®2 (95.45% and 100%, respectively). In addition, TDR-300B had a lower positive predictive value and accuracy than VITEK®2, albeit without significance., Conclusions: Conclusively, there were no significant differences regarding the diagnostic efficiency of TDR-300B and VITEK®2 for P. aeruginosa .
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- 2021
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17. Superfluid Black Holes.
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Hennigar RA, Mann RB, and Tjoa E
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We present what we believe is the first example of a "λ-line" phase transition in black hole thermodynamics. This is a line of (continuous) second order phase transitions which in the case of liquid ^{4}He marks the onset of superfluidity. The phase transition occurs for a class of asymptotically anti-de Sitter hairy black holes in Lovelock gravity where a real scalar field is conformally coupled to gravity. We discuss the origin of this phase transition and outline the circumstances under which it (or generalizations of it) could occur.
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- 2017
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18. Acinetobacter baumannii: Role in Blood Stream Infection in Neonatal Unit, Dr. Cipto Mangunkusumo Hospital, Jakarta, Indonesia.
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Tjoa E, Moehario LH, Rukmana A, and Rohsiswatmo R
- Abstract
Acinetobacter baumannii (A. baumannii) is Gram-negative coccobacilli that has emerged as a nosocomial pathogen. Several reports in Indonesia showed the continuous presence of A. baumannii. This study aimed to determine the incidence of A. baumannii bacteremia in neonates in the Neonatal Unit Dr. Cipto Mangunkusumo Hospital (RSCM), Jakarta, Indonesia, and assess its role in blood stream infection using antibiogram and genotyping by pulsed-field gel electrophoresis (PFGE). Subjects were neonates with clinical sepsis. Blood specimens from the neonates and samples of suspected environment within the Neonatal Unit were cultivated. Antimicrobial resistance profiles were classified for analysis purpose. A. baumannii isolates were genotyped by PFGE to determine their similarity. A total of 24 A. baumannii were isolated from 80 neonates and the environment during this period of study. Seven isolates from the neonates showed multiple antimicrobial resistance (MDR), and 82% (n = 17) of the environment isolates were also MDR. Antibiotype "d" seemed to be predominant (62.5%). PFGE analysis showed a very close genetic relationship between the patients and environment isolates (Dice coefficient 0.8-1.0). We concluded that a mode of transmission of environmental microbes to patients was present in the Neonatal Unit of RSCM and thus needed to be overcome.
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- 2013
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19. Trends in antimicrobial susceptibility of gram-negative bacteria isolated from blood in Jakarta from 2002 to 2008.
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Moehario LH, Tjoa E, Kiranasari A, Ningsih I, Rosana Y, and Karuniawati A
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- Blood microbiology, Gram-Negative Bacteria isolation & purification, Humans, Indonesia, Microbial Sensitivity Tests, Anti-Bacterial Agents pharmacology, Bacteremia microbiology, Gram-Negative Bacteria drug effects, Gram-Negative Bacterial Infections microbiology
- Abstract
Background: This study examined the susceptibility of Gram-negative bacteria in the bloodstream to antimicrobials with the aim of providing information relevant to the guidance of therapy., Methodology: Blood specimens received by the Laboratory of Clinical Microbiology, Faculty of Medicine, University of Indonesia, from 2002 to 2008, were analyzed for the presence of Gram-negative bacteria and their susceptibility to four antibiotic groups frequently administered in hospitals and community settings., Results: During the seven-year period leading up to 2008, approximately 68% of Gram-negative bacteria were identified among all positive isolates from blood specimens. The eight most frequent species found were Acinetobacter anitratus (25.8%), Pseudomonas aeruginosa (19.5%), Klebsiella pneumoniae subsp. pneumoniae (14.5%), Enterobacter aerogenes (8%), Salmonella Typhi (7.5%), Escherichia coli (6.2%), Alcaligenes faecalis (5.6%) and Klebsiella oxytoca (3.2%). At 80% susceptibility or greater, Ceftriaxone and Cefotaxime were active only on E. coli and S. Typhi. Cefepime demonstrated activity on all eight species tested except K. pneumonia while Amikacin showed activity against five species, A. faecalis, E. aerogenes, E. coli, K. pneumoniae subsp. pneumoniae and S. Typhi. Gentamycin was active against three species: E. aerogenes, K. oxytoca and S. Typhi. Ciprofloxacin and Levofloxacin significantly differed in their spectrum: while Ciprofloxacin was active against four of the eight species tested (E. aerogenes, E. coli, K. oxytoca, and S. Typhi ), Levofloxacin was similar to Cefepime and was active against all eight species except K. pneumoniae subsp. pneumonia., Conclusions: Since antimicrobials are broadly used in Jakarta, it is important that the information captured in this study be disseminated.
- Published
- 2009
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