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Enhancing Septic Shock Detection through Interpretable Machine Learning

Computer Modeling in Engineering & Sciences 2024年第12期141卷 2501-2525页

作者： md Mahfuzur Rahman md.solaiman chowdhury Mohammad Shorfuzzaman Lutful Karim md Shafiullah Farag Azzedin Department of Information and Computer Science King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Department of Electrical and Computer Engineering North South UniversityDhaka1229Bangladesh Department of Computer Science Taif UniversityTaif21974Saudi Arabia College of Applied Arts and Technology Seneca PolytechnicTorontoM2J 2X5Canada Department of Control&Instrumentation Engineering King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

This article presents an innovative approach that leverages interpretable machine learning models and cloud computing to accelerate the detection of septic shock by analyzing electronic health *** traditional methods,which often lack transparency in decision-making,our approach focuses on early detection,offering a proactive strategy to mitigate the risks of *** integrating advanced machine learning algorithms with interpretability techniques,our method not only provides accurate predictions but also offers clear insights into the factors influencing the model’s ***,we introduce a preference-based matching algorithm to evaluate disease severity,enabling timely interventions guided by the analysis *** innovative integration significantly enhances the effectiveness of our *** leverage a clinical health dataset comprising 1,552,210 Electronic Health Records(EHR)to train our interpretable machine learning models within a cloud computing *** techniques like feature importance analysis and model-agnostic interpretability tools,we aim to clarify the crucial indicators contributing to septic shock *** transparency not only assists healthcare professionals in comprehending the model’s predictions but also facilitates the integration of our system into existing clinical *** validate the effectiveness of our interpretable models using the same dataset,achieving an impressive accuracy rate exceeding 98%through the application of oversampling *** findings of this study hold significant implications for the advancement of more effective and transparent diagnostic tools in the critical domain of sepsis management.

关键词： Sepsis prediction machine learning cloud computing

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A modified gas flow model in the near wellbore region below dew point pressure

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Petroleum 2021年第3期7卷 294-302页

作者： Abed Inan chowdhury md Mostafijul Karim Department of Petroleum and Mining Engineering Chittagong University of Engineering&TechnologyChittagongBangladesh

When pressure in gas reservoirs fall below the dew point,condensate banking occurs around the wellbore which alters the fluid flow *** state of the knowledge on this flow behavior is yet not fully-developed;which leads to severe problems in *** this study,the Al-Hussainy,Ramey,and Crawford Solution Technique has been modified to accurately resemble the real gas flow behavior for this ***,a primary investigation was conducted to observe the severity of the problem in three condensate banked *** this study involved Constant Composition Expansion tests for determining the dew point,Prode Properties software for modeling the reservoir fluid properties,Flowing Material Balance(or Dynamic P/Z Material Balance)for identifying the pressure distribution of the selected *** real field data along with the determined(analytical,computational,and experimental)data were incorporated to check the validity of the *** modification proposes a Dimensionless Correction Factor(CD)for any condensate banked reservoir and identifies parameters such as the Perforation Factor(Pf)and Heterogeneity Factor(n).It is found that the Modified Al-Hussainy,Ramey,and Crawford Solution Technique successfully models the actual flow characteristics of the stated condition.

关键词： Condensate banking Effective permeability Gas flow modeling Model fitting

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Hydrostatic reduction of intussusception with intermittent radiography:an alternative to fluoroscopy or ultrasoundguided reduction in low-income and middle-income countries

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World Journal of Pediatric Surgery 2021年第1期4卷 14-20页

作者： Tanvir Kabir chowdhury md.Qumrul Ahsan Mohammad Zonaid chowdhury md.Tameem Shafayat chowdhury md.Sharif Imam md.Afruzul Alam md.Abdullah Al Farooq Department of Pediatric Surgery Chittagong Medical CollegeChattogramBangladesh Department of Radiology and Imaging Chattogram Maa-O Shishu Hospital Medical CollegeChattogramBangladesh Radiology and Imaging Centre for Specialized Care and Research(CSCR)ChattogramBangladesh

Background Although hydrostatic reduction of intussusception with ultrasound(US)or fluoroscopy guidance is well known,it is not yet well established in many low-income and middle-income *** aim of the study is to report our results of hydrostatic reduction with intermittent radiography,which has the potential to be practiced in resource-limited *** We retrospectively analyzed our patients with intussusception from 2009 to 2019(11 years).Hydrostatic reduction was performed using water-soluble contrast medium(iopamidol),and reduction was followed with intermittent X-rays taken after every 50 mL of diluted contrast *** procedure was not continuously monitored by US or *** in outcome based on age and gender,and yearly trends of admission for intussusception,types of treatment and mortality were *** Among 672 patients,the ratio of boys to girls was 2.46:1.0,and their ages ranged from 1 month to 15 years(median 8 months).Hydrostatic reduction was performed successfully in 351(52.23%)patients;308(45.83%)patients underwent surgery;and 13(1.93%)patients died before any *** were significant differences in age between patients with successful hydrostatic reduction(median 7 months)and patients needing surgery(median 9 months)(p<0.001).The number of successful hydrostatic reductions increased during the 11 years of the study(R2=0.88).One patient(0.15%)died after hydrostatic reduction,and 10(1.49%)died after *** Hydrostatic reduction with intermittent radiography was performed successfully in more than half of the patients with acceptable complication rates.

关键词： income hydrostatic diluted

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Patterns of tree buttressing at Lawachara National Park, Bangladesh

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Journal of Forestry Research 2012年第3期23卷 461-466页

作者： md. A bu Hanifa Mehedi Chandan Kundu md. Qumruzzaman chowdhury Department of Forestry and Environmental Science Shahjalal University of Science and TechnologySylhet-3114Bangladesh

We describe patterns of buttress formation and development in eleven tree species at Lawachara National Park, Bangladesh. Forty-five percent of trees of these 11 species had buttresses. Artocarpus chaplasha Roxb. showed maximum （87%） buttress formation, whereas Alstonia scholaris （L.） R. Br. did not show any buttress. Buttresses were recorded in 20%-40% of trees of six species and 40%-60% of trees in three species. Mean length and height of buttress varied among the species and ranged from 0.37-4.37 m and 0.71-2.13 m, respectively. Buttress height, mean buttress length, total buttress length, and total length plus length of secondaries increased with DBH （diameter at breast height） and tree height. Buttress number did not increase with DBH or tree height. Under-storey and mid-canopy trees produced less developed buttresses than did emergent trees （p〈0.01）. Wood density showed moderate effects on buttress characters （p〈0.05）, while the slope of the land did not. Canopy category was a primary regulating factor for tree buttressing, suggesting that buttresses are mechanical adaptations of trees to counter physical stresses.

关键词： buttresses tree architecture canopy category slope of the ground wood density

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Spatiotemporal variation and mechanisms of temperature inversion in the Bay of Bengal and the eastern equatorial Indian Ocean

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Acta Oceanologica Sinica 2022年第4期41卷 23-39页

作者： K M Azam chowdhury Wensheng Jiang Guimei Liu md Kawser Ahmed Shaila Akhter College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China KeyLab of Marine Environment and Ecology of Ministry of Education Ocean University of ChinaQingdao 266100China Department of Oceanography&International Centre for Ocean Governance(ICOG) University of DhakaDhaka 1000Bangladesh National Marine Environmental Forecasting Center Beijing 100081China

In the northern Bay of Bengal,the existence of intense temperature inversion during winter is a widely accepted ***,occurrences of temperature inversion during other seasons and the spatial distribution within and adjacent to the Bay of Bengal are not well *** this study,a higher resolution spatiotemporal variation of temperature inversion and its mechanisms are examined with mixed layer heat and salt budget analysis utilizing long-term Argo(2004 to 2020)and RAMA(2007 to 2020)profiles data in the Bay of Bengal and eastern equatorial Indian Ocean(EEIO).Temperature inversion exists(17.5%of the total 39293 Argo and 51.6%of the 28894 RAMA profiles)throughout the year in the entire study *** shows strong seasonal variation,with the highest occurrences in winter and the lowest in *** winter inversion in the northern Bay of Bengal,two other regions with frequent temperature inversion are identified in this study for the first time:the northeastern part of the Bay of Bengal and the eastern part of the EEIO during summer and *** processes of temperature inversion for different subregions are revealed in the current *** of heat(mean~25 W/m;)below the haline-stratified shallow mixed layer leads to a relatively warmer subsurface layer along with the simultaneous cooling tendency in mixed layer,which controls more occurrence of temperature inversion in the northern Bay of Bengal throughout the *** lower cooling tendency due to net surface heat loss and higher mixed layer salinity leaves the southern part of the bay less supportive to the formation of temperature inversion than the northern *** the EEIO,slightly cooling tendency in the mixed layer along with the subduction of warm-salty Arabian Sea water beneath the cold-fresher Bay of Bengal water,and downwelling of thermocline creates a favorable environment for forming temperature inversion mainly during summer and *** isothermal layer

关键词： temperature inversion Bay of Bengal Argo and RAMA data intrusion of the Arabian Sea water eastern equatorial Indian Ocean penetrative heat below mixed layer depth

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Contributions of shortwave radiation to the formation of temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean:A modeling approach

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Acta Oceanologica Sinica 2022年第9期41卷 19-37页

作者： K M Azam chowdhury Wensheng Jiang Changwei Bian Guimei Liu md Kawser Ahmed Shaila Akhter College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao266100China Department of Oceanography&International Centre for Ocean Governance(ICOG) University of DhakaDhaka1000Bangladesh National Marine Environmental Forecasting Center Beijing100081China Key Lab of Marine Environment and Ecology of Ministry of Education Ocean University of ChinaQingdao266100China Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES) Ocean University of ChinaQingdao266100China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao266237China Bangladesh Betar Ministry of Information and BroadcastingGovernment of the People’s Republic of BangladeshDhaka1207Bangladesh

Variations in incoming shortwave radiation influence the net surface heat flux,contributing to the formation of a temperature *** effects of shortwave radiation on the temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean have never been ***,a high-resolution(horizontal resolution of 0.07°×0.07° with 50 vertical layers) Regional Ocean Modeling System(ROMS) model is utilized to quantify the contributions of shortwave radiation to the temperature inversions in the study *** of the mixed layer heat and salt budgets are performed,and different model simulations are *** model results suggest that a 30% change in shortwave radiation can change approximately 3% of the temperature inversion area in the Bay of *** shortwave radiation reduces the net surface heat flux and cools the mixed layer substantially;it also reduces the evaporation rate,causing less evaporative water vapor losses from the ocean than the typical situation,and ultimately enhances haline ***,the rudimentary outcome of this research is that a decrease in shortwave radiation produces more temperature inversion in the study region,which is primarily driven by the net surface cooling and supported by the intensive haline ***,low shortwave radiation eventually intensifies the temperature inversion layer by thickening the barrier *** study could be an important reference for predicting how the Indian Ocean climate will respond to future changes in shortwave radiation.

关键词： mixed layer cooling haline stratification temperature inversion ROMS model shortwave radiation Bay of Bengal eastern equatorial Indian Ocean

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Enhancing Telemarketing Success Using Ensemble-Based Online Machine Learning

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Big Data Mining and Analytics 2024年第2期7卷 294-314页

作者： Shahriar Kaisar md Mamunur Rashid Abdullahi chowdhury Sakib Shahriar Shafin Joarder Kamruzzaman Abebe Diro Department of Information Systems and Business Analytics RMIT UniversityMelbourne 3000Australia School of Engineering and Technology Central Queensland UniversityRockhampton 4700Australia Faculty of Engineering Computer and Mathematical ScienceUniversity of AdelaideAdelaide 5005Australia Centre for Smart Analytics Federation University AustraliaBallarat 3350Australia School of Accounting Information Systems and Supply ChainRMIT UniversityMelbourne 3000Australia

Telemarketing is a well-established marketing approach to offering products and services to prospective *** effectiveness of such an approach,however,is highly dependent on the selection of the appropriate consumer base,as reaching uninterested customers will induce annoyance and consume costly enterprise resources in vain while missing interested *** introduction of business intelligence and machine learning models can positively influence the decision-making process by predicting the potential customer base,and the existing literature in this direction shows promising ***,the selection of influential features and the construction of effective learning models for improved performance remain a ***,from the modelling perspective,the class imbalance nature of the training data,where samples with unsuccessful outcomes highly outnumber successful ones,further compounds the problem by creating biased and inaccurate ***,customer preferences are likely to change over time due to various reasons,and/or a fresh group of customers may be targeted for a new product or service,necessitating model retraining which is not addressed at all in existing works.A major challenge in model retraining is maintaining a balance between stability(retaining older knowledge)and plasticity(being receptive to new information).To address the above issues,this paper proposes an ensemble machine learning model with feature selection and oversampling techniques to identify potential customers more accurately.A novel online learning method is proposed for model retraining when new samples are available over *** newly introduced method equips the proposed approach to deal with dynamic data,leading to improved readiness of the proposed model for practical adoption,and is a highly useful addition to the *** experiments with real-world data show that the proposed approach achieves excellent results in all cases(e.g.,98.6

关键词： machine learning online learning oversampling telemarketing imbalanced dataset ensemble model

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The response of the upper ocean to tropical cyclone Viyaru over the Bay of Bengal

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Acta Oceanologica Sinica 2019年第1期38卷 61-70页

作者： Mir Kashem md Kawser Ahmed Fangli Qiao M A E Akhter K M Azam chowdhury Department of Oceanography University of Dhaka First Institute of Oceanography Ministry of Natural Resources Department of Physics Khulna University of Engineering & Technology

Better forecast of tropical cyclone(TC) can help to reduce risk and enhance management. The TC forecast depends on the scientific understanding of oceanic processes, air-sea interaction and finally, the atmospheric process. The TC Viyaru is taken as an example, which is formed at the end of 11 May 2013 and sustains up to 17 May 2013 during pre-monsoon season. Argo data are used to investigate ocean response processes by comparing pre-and post-conditions of the TC. Eight oceanic parameters including the sea surface temperature(SST), the sea surface salinity(SSS), and the barrier layer thickness(BLT), the 26°C isotherm depth in the ocean(D26), the isothermal layer depth(ILD), the mixed layer depth(MLD), the tropical cyclone heat potential(TCHP) and the effective oceanic layer for cyclogenesis(EOLC) are chosen to evaluate the pre-and post-conditions of the TC along the track of Viyaru. The values of the SST, D26, BLT, TCHP and EOLC in the pre-cyclonic condition are higher than the post-cyclonic condition, while the SSS, ILD and MLD in the post-cyclonic condition are higher than the pre-cyclonic condition of the ocean due to strong cyclonic winds and subsurface upwelling. It is interesting that the strong intensity of the TC reduces less SST and vice versa. The satisfied real time Argo data is not available in the northern Bay of Bengal especially in the coastal region. A weather research and forecasting model is employed to hindcast the track of Viyaru, and the satellite data from the National Center Environmental Prediction are used to assess the hindcast.

关键词： effective oceanic layer for cyclogenesis, sea surface temperature tropical cyclone tropical cyclone heat potential tropical cyclone viyaru weather research and forecasting model

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Microstrip Patch Antenna with an Inverted T-Type Notch in the Partial Ground for Breast Cancer Detections

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1301-1322页

作者： Nure Alam chowdhury Lulu Wang md Shazzadul Islam Linxia Gu Mehmet Kaya Department of Biomedical Engineering and Science Florida Institute of TechnologyMelbourneFL 32901USA Biomedical Device Innovation Center Shenzhen Technology UniversityShenzhen518118China Department of Electrical and Computer Engineering International Islamic University MalaysiaJalan GombakSelangor53100Malaysia

This study designs a microstrip patch antenna with an inverted T-type notch in the partial ground to detect tumorcells inside the human *** size of the current antenna is small enough(18mm×21mm×1.6mm)todistribute around the breast *** operating frequency has been observed from6–14GHzwith a minimumreturn loss of−61.18 dB and themaximumgain of current proposed antenna is 5.8 dBiwhich is flexiblewith respectto the size of *** the distribution of eight antennas around the breast phantom,the return loss curveswere observed in the presence and absence of tumor cells inside the breast phantom,and these observations showa sharp difference between the presence and absence of tumor *** simulated results show that this proposedantenna is suitable for early detection of cancerous cells inside the breast.

关键词： Antenna microwave wideband cancer breast phantom tumor detection

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Design and Optimization of Photonic Crystal Fiber Based Sensor for Gas Condensate and Air Pollution Monitoring

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Photonic Sensors 2017年第3期7卷 234-245页

作者： md. Ibadul ISLAM Kawsar AHMED Shuvo SEN Sawrab chowdhury Bikash Kumar PAUL md. Shadidul ISLAM Mohammad Badrul Alam MIAH Sayed ASADUZZAMAN Department of Information and Communication Technology (ICT) Mawlana Bhashani Science and Technology University Santosh Tangail 1902 Bangladesh Group of Bio-photomatix Tangail 1902 Bangladesh Department of Software Engineering (SWE) Daffodil International University Sukrabad Dhaka 1207 Bangladesh

In this paper, a hexagonal shape photonic crystal fiber （H-PCF） has been proposed as a gas sensor of which both micro-structured core and cladding are organized by circular air cavities. The reported H-PCF has a single layer circular core which is surrounded by a five-layer hexagonal cladding. The overall pretending process of the H-PCF is completed by using a full vectorial finite element method （FEM） with perfectly matched layer （PML） boundary condition. All geometrical parameters like diameters and pitches of both core and cladding regions have fluctuated with an optimized structure. After completing the numerical analysis, it is clearly visualized that the proposed H-PCF exhibits high sensitivity with low confinement loss. The investigated results reveal the relative sensitivity of 56.65% and confinement loss of 2.31×10^-5 dB/m at the 1.33%tm wavelength. Moreover, effective area, nonlinearity, and V-parameter of the suggested PCF are also briefly described.

关键词： Relative sensitivity confinement loss gas sensor effective area nonlinearity and photonic crystal fiber

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