12 results on '"Him R"'
Search Results
2. Polymer substrate temperature sensor array for brain interfaces
- Author
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Ho Him R. Fok, Insoo Kim, Thomas N. Jackson, Bruce J. Gluckman, and Yuanyuan V. Li
- Subjects
Materials science ,business.industry ,Wide-bandgap semiconductor ,Brain ,Biosensing Techniques ,Temperature measurement ,Signal ,Article ,Body Temperature ,Printed circuit board ,Sensor array ,Thin-film transistor ,Calibration ,Humans ,Optoelectronics ,Polymer substrate ,business ,Polyimide - Abstract
We developed an implantable thin film transistor temperature sensor (TFT-TS) to measure temperature changes in the brain. These changes are assumed to be associated with cerebral metabolism and neuronal activity. Two prototype TFT-TSs were designed and tested in-vitro: one with 8 diode-connected single-ended sensors, and the other with 4 pairs of differential-ended sensors in an array configuration. The sensor elements are 25 ~ 100 pm in width and 5 μm in length. The TFT-TSs were fabricated based on high-speed ZnO TFT process technology on flexible polyimide substrates (50 μm thick, 500 μm width, 20 mm length). In order to interface external signal electronics, they were directly bonded to a prototype printed circuit board using anisotropic conductive films The prototypes were characterized between 23 ~ 38 °C using a commercial temperature sensor and custom-designed temperature controlled oven. The maximum sensitivity of 40 mV/°C was obtained from the TFT-TS.
- Published
- 2011
- Full Text
- View/download PDF
3. Thermal effects in oxide TfTs
- Author
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Ho Him R. Fok, Dalong A. Zhao, Devin A. Mourey, Thomas N. Jackson, and Yuanyuan V. Li
- Subjects
Materials science ,Silicon ,business.industry ,Oxide ,chemistry.chemical_element ,Conductivity ,Oxide thin-film transistor ,Pulsed laser deposition ,Amorphous solid ,chemistry.chemical_compound ,chemistry ,Thin-film transistor ,Electronic engineering ,Optoelectronics ,business ,Microwave - Abstract
Oxide semiconductor electronics may enable new applications including large-area, flexible, integrated systems. ZnO thin film transistors have been reported with field-effect mobility > 100 cm2/V·s, on-current density > 700 mA/mm, and microwave operation (f T > 2 GHz, f max > 7 GHz) for ZnO deposited by pulsed laser deposition at 400°C.[1] Other oxide semiconductors, including amorphous and crystalline mixtures of I 2 O 3 , Ga 2 O 3 , ZnO, have also been widely studied, and high mobility (> 30 cm2/V·s) thin film transistors and circuits with propagation delays d = dI DS /dV DS ) observed in a range of oxide thin film transistors. In particular we find that self-heating is a significant limiting factor for the performance of oxide devices and circuits on low-cost, low-thermal conductivity substrates such as glass and plastic.
- Published
- 2010
- Full Text
- View/download PDF
4. Thermal effects in oxide TfTs
- Author
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Mourey, Devin A., primary, Zhao, Dalong A., additional, Fok, Ho Him R., additional, Li, Yuanyuan V., additional, and Jackson, Thomas N., additional
- Published
- 2010
- Full Text
- View/download PDF
5. 61.1: Invited Paper: ZnO Thin Film Transistors and Circuits on Flexible Polymeric Substrates by Low‐Temperature PEALD
- Author
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Zhao, Dalong A., primary, Mourey, Devin A., additional, Fok, Ho Him R., additional, Li, Yuanyuan V., additional, and Jackson, Thomas N., additional
- Published
- 2010
- Full Text
- View/download PDF
6. 61.1: Invited Paper: ZnO Thin Film Transistors and Circuits on Flexible Polymeric Substrates by Low-Temperature PEALD
- Author
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Thomas N. Jackson, Ho Him R. Fok, Devin A. Mourey, Dalong A. Zhao, and Yuanyuan V. Li
- Subjects
Atomic layer deposition ,Semiconductor ,Materials science ,Yield (engineering) ,business.industry ,Thin-film transistor ,Electronic engineering ,Optoelectronics ,Dielectric ,business ,Polyimide ,Electronic circuit ,Threshold voltage - Abstract
We report using a novel, weak oxidant, plasma-enhanced atomic layer deposition (PEALD) process at 200 °C to fabricate stable, high mobility ZnO thin film transistors (TFTs) and fast circuits on glass and polyimide substrates. Weak oxidant PEALD provides a simple, fast deposition process that results in uniform, conformai semiconductor and dielectric layers and enhancement-mode MOSFETs from uncompensated films. Highly conformai PEALD Al2O3 layers provide a high yield dielectric on rough plastic substrates for both PEALD ZnO TFTs and cross-overs. Our PEALD ZnO TFTs have field-effect mobility of >20 cm2/V·s on polyimide substrates with excellent bias stress stability. TFTs biased continuously for 40,000s showed
- Published
- 2010
- Full Text
- View/download PDF
7. Effectiveness of neonatal resuscitation training programs, implementation and scale-up in low- and middle-income countries.
- Author
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Sihota D, Lee Him R, Dominguez G, Harrison L, Vaivada T, and Bhutta ZA
- Abstract
Introduction: To describe recent evidence regarding the most effective neonatal resuscitation training program and scale-up of these programs in low-and middle-income countries (LMICs), which has contributed to the upcoming Lancet Global Newborn Care Series 2025, and forms part of a supplement describing an extensive synthesis on effective newborn interventions in LMICs., Methods: We included relevant studies from Medline, Embase, CINAHL, Cochrane CENTRAL and Global Index Medicus databases on the effectiveness and scale-up of Neonatal Resuscitation Training Programs (NRTP), with searches run August 2022. Data extraction and quality assessments were completed independently and in duplicate., Results: A total of 93 unique records met the eligibility criteria and were included in our analyses across the reviews. NRTPs improved most knowledge and skill-based outcomes but impact on mortality varied. Included studies identified knowledge and skill retention, standardized training protocols, and limited training opportunities for health care providers as challenges to current NRTPs., Conclusion: Reported knowledge, skills, and mortality outcomes were similar across NRTPs. The Helping Babies Breathe (HBB) program was found to be cost-effective in Tanzania, suggesting that the HBB program or elements thereof are low-cost and scalable in LMICs. Future research across diverse settings should evaluate the cost-effectiveness of other NRTPs. To scale-up current NRTPs, programs should focus on improving long-term retention outcomes and improving training material accessibility., (The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2024
- Full Text
- View/download PDF
8. Supportive Care for Common Conditions in Small Vulnerable Newborns and Term Infants: The Evidence.
- Author
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Jiang L, Lee Him R, Sihota D, Muralidharan O, Dominguez G, Harrison L, Vaivada T, and Bhutta ZA
- Abstract
Introduction: Small vulnerable newborns (SVNs) are at an increased risk of early death and other morbidities. Essential interventions provided to SVN, and other high-risk newborns have been proven critical in improving their outcomes. We aimed to provide an update on the effectiveness and safety of these interventions in low- and middle-income countries (LMICs)., Method: Following a comprehensive literature scope, we updated or reanalyzed LMIC-specific evidence for essential SVN care interventions., Results: A total of 113 individual LMIC studies were identified. Most of them were of high risk of bias. Kangaroo mother care significantly reduced SVN's mortality by discharge. Early erythropoiesis stimulating agent lowered SVN's risk of receiving blood transfusion. Prophylactic oral or intravenous ibuprofen resulted in a decreased risk of patent ductus arteriosus in SVN. But it did not have a significant effect on mortality and led to a higher risk of gastrointestinal bleeding. No pooled LMIC data were available for universal screening of hyperbilirubinemia in high-risk newborns. Sunlight therapy had no effect in treating hyperbilirubinemia but increased the risk of hyperthermia. Reflective curtains with phototherapy resulted in a greater and faster decline in bilirubin than standard phototherapy in treating hyperbilirubinemia. Early child development interventions were shown to have a favorable effect on cognitive and motor scores in SVN. The evidence for family involvement and family support was limited and uncertain., Conclusion: We present the most updated LMIC evidence for interventions targeting SVN. Despite their effectiveness and safety in improving certain neonatal outcomes, further high-quality trials are required., (© 2024 The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2024
- Full Text
- View/download PDF
9. The Care of Preterm and Term Newborns with Respiratory Conditions: A Systematic Synthesis of Evidence from Low- and Middle-Income Countries.
- Author
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Dominguez G, Muralidharan O, Lee Him R, Harrison L, Vaivada T, and Bhutta ZA
- Abstract
Introduction: Neonatal respiratory conditions are leading causes of mortality and morbidity during the neonatal period. This review evaluated 11 management interventions for respiratory distress syndrome (RDS), apnoea of prematurity (AOP), meconium aspiration syndrome (MAS), transient tachypnea of the newborn (TTN), as well as bronchopulmonary dysplasia (BPD) as a potential complication from respiratory care in low- and middle-income countries (LMICs)., Methods: Two different methodological approaches were completed: (1) updating outdated reviews and pooling all LMIC studies and (2) re-analysis of LMIC studies from up-to-date reviews. Review updates were conducted between October 2022 and February 2023 and followed systematic methodology. A total of 50 studies were included across four review updates and seven review re-analyses., Results: Findings indicate that bubble CPAP (RR 0.74, 95% CI 0.58 to 0.96) and prophylactic CPAP (RR 0.39, 95% CI 0.26 to 0.57) for RDS reduced the risk of treatment failure compared to other ventilation types or supportive care, respectively. Postnatal corticosteroids reduced BPD assessed as oxygen requirement at 36 weeks' postmenstrual age (RR 0.56, 95% CI 0.41 to 0.77). All other outcomes were found to be non-significant across remaining interventions., Conclusions: Our findings indicate that prophylactic and bubble CPAP may provide some benefit by reducing treatment failure compared to other pressure sources. The safety and efficacy of other management interventions for RDS, AOP, BPD, MAS, and TTN remains uncertain given limited evaluations in LMICs. Future research should conduct adequately powered trials in underrepresented LMIC regions, investigate long-term outcomes, and evaluate cost-effectiveness., (The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2024
- Full Text
- View/download PDF
10. Prevention and Treatment of Neonatal Infections in Facility and Community Settings of Low- and Middle-Income Countries: A Descriptive Review.
- Author
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Lee Him R, Rehman S, Sihota D, Yasin R, Azhar M, Masroor T, Naseem HA, Masood L, Hanif S, Harrison L, Vaivada T, Sankar MJ, Dramowski A, Coffin SE, Hamer DH, and Bhutta ZA
- Abstract
Introduction: We present a robust and up-to-date synthesis of evidence on the effectiveness of interventions to prevent and treat newborn infections in low- and middle-income countries (LMICs). Newborn infection prevention interventions included strategies to reduce antimicrobial resistance (AMR), prevention of healthcare-associated infections (HAIs), clean birth kits (CBKs), chlorhexidine cleansing, topical emollients, and probiotic and synbiotic supplementation. Interventions to treat suspected neonatal infections included prophylactic systemic antifungal agents and community-based antibiotic delivery for possible serious bacterial infections (PSBIs)., Methods: A descriptive review combining different methodological approaches was conducted. To provide the most suitable recommendations for real-world implementation, our analyses considered the impact of these interventions within three distinct health settings: facility, mixed, and community., Results: In facility settings, the strongest evidence supported the implementation of multimodal stewardship interventions for AMR reduction and device-associated infection prevention bundles for HAI prevention. Emollients in preterm newborns reduced the risk of invasive infection compared to routine skin care. Probiotics in preterm newborns reduced neonatal mortality, invasive infection, and necrotizing enterocolitis (NEC) risks compared to standard care or placebo. There was insufficient evidence for synbiotics and prophylactic systemic antifungals in LMICs. In mixed settings, CBKs reduced neonatal mortality risk compared to standard care. In community settings, chlorhexidine umbilical cord cleansing reduced omphalitis risk compared to dry cord care. For the treatment of PSBIs, purely domiciliary-based antibiotic delivery reduced the risk of all-cause neonatal mortality when compared to the standard hospital referral., Conclusion: Strategies for preventing HAIs and reducing AMR in healthcare facilities should be multimodal, and strategy selection should consider the feasibility of integration within existing newborn care programs. Probiotics are effective for facility-based use in preterm newborns; however, the establishment of high-quality, cost-effective mass production of standardized formulations is needed. Chlorhexidine cord cleansing is effective in community settings to prevent omphalitis in contexts where unhygienic cord applications are prevalent. Community-based antibiotic delivery of simplified regimens for PSBIs is a safe alternative when hospital-based care in LMICs is not possible or is declined by parents. More randomized trial evidence is needed to establish the effectiveness of CBKs, emollients, synbiotics, and prophylactic systemic antifungals in LMICs., (© 2024 The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2024
- Full Text
- View/download PDF
11. Prognostic factors of quality of life after transoral laser microsurgery for laryngeal cancer.
- Author
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Vilaseca I, Bernal-Sprekelsen M, Him R, Mandry A, Lehrer E, and Blanch JL
- Subjects
- Aged, Female, Humans, Male, Middle Aged, Neck Dissection methods, Neck Dissection psychology, Neoplasm Staging, Prognosis, Radiotherapy, Adjuvant methods, Radiotherapy, Adjuvant psychology, Surveys and Questionnaires, Tumor Burden, Carcinoma pathology, Carcinoma psychology, Carcinoma surgery, Deglutition Disorders etiology, Deglutition Disorders psychology, Laryngeal Neoplasms pathology, Laryngeal Neoplasms psychology, Laryngeal Neoplasms surgery, Laser Therapy methods, Laser Therapy psychology, Microsurgery methods, Microsurgery psychology, Neck Dissection adverse effects, Postoperative Complications psychology, Quality of Life, Radiotherapy, Adjuvant adverse effects, Speech Disorders etiology, Speech Disorders psychology
- Abstract
We aimed to evaluate factors influencing quality of life (QOL) after transoral laser microsurgery (TLM) of laryngeal cancer. Four hundred and one consecutive disease-free patients were evaluated 1 year after treatment using the University of Washington-QOL v4, the SF-12 (short form of SF-36), and a questionnaire about self-rated health status. The importance of age, gender, tumor location, tumor size, tumor stage, neck dissection and adjuvant treatment were evaluated. One year after TLM patients had a good QOL, with only 6 % of patients reporting a worsening in their health status. Radiation therapy (p = 0.000) and neck dissection (p = 0.000) were negative factors for disease-specific QOL, whereas age ≥ 70 (p = 0.01) was a positive independent factor for mental score of SF-12. Speech was negatively influenced by tumor size (p = 0.001) as was swallowing by age (p = 0.001) and postoperative radiation (p = 0.000). Patients treated with TLM present a good QOL 1 year after surgery. Radiation and neck dissection negatively impact QOL. Elderly patients cope better with their disabilities.
- Published
- 2015
- Full Text
- View/download PDF
12. Polymer substrate temperature sensor array for brain interfaces.
- Author
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Kim I, Fok HH, Li Y, Jackson TN, and Gluckman BJ
- Subjects
- Calibration, Humans, Biosensing Techniques, Body Temperature, Brain physiology
- Abstract
We developed an implantable thin film transistor temperature sensor (TFT-TS) to measure temperature changes in the brain. These changes are assumed to be associated with cerebral metabolism and neuronal activity. Two prototype TFT-TSs were designed and tested in-vitro: one with 8 diode-connected single-ended sensors, and the other with 4 pairs of differential-ended sensors in an array configuration. The sensor elements are 25 ~ 100 pm in width and 5 μm in length. The TFT-TSs were fabricated based on high-speed ZnO TFT process technology on flexible polyimide substrates (50 μm thick, 500 μm width, 20 mm length). In order to interface external signal electronics, they were directly bonded to a prototype printed circuit board using anisotropic conductive films The prototypes were characterized between 23 ~ 38 °C using a commercial temperature sensor and custom-designed temperature controlled oven. The maximum sensitivity of 40 mV/°C was obtained from the TFT-TS.
- Published
- 2011
- Full Text
- View/download PDF
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