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ردیف | عنوان | نوع |
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1 |
Detection of loosening angle for mark bolted joints with computer vision and geometric imaging
تشخیص زاویه شل شدن اتصالات پیچ شده با بینایی ماشین و تصویربرداری هندسی-2022 Mark bars drawn on the surfaces of bolted joints are widely used to indicate the severity of loosening. The
automatic and accurate determination of the loosening angle of mark bolted joints is a challenging issue that has
not been investigated previously. This determination will release workers from heavy workloads. This study
proposes an automated method for detecting the loosening angle of mark bolted joints by integrating computer
vision and geometric imaging theory. This novel method contained three integrated modules. The first module
used a Keypoint Regional Convolutional Neural Network (Keypoint-RCNN)-based deep learning algorithm to
detect five keypoints and locate the region of interest (RoI). The second module recognised the mark ellipse and
mark points using the transformation of the five detected keypoints and several image processing technologies
such as dilation and expansion algorithms, a skeleton algorithm, and the least square method. In the last module,
according to the geometric imaging theory, we derived a precise expression to calculate the loosening angle using
the information for the mark points and mark ellipse. In lab-scale and real-scale environments, the average
relative detection error was only 3.5%. This indicated that our method could accurately calculate the loosening
angles of marked bolted joints even when the images were captured from an arbitrary view. In the future, some
segmentation algorithms based on deep learning, distortion correction, accurate angle and length measuring
instruments, and advanced transformation methods can be applied to further improve detection accuracy. keywords: Mark bolted joint | Loosening detection | Keypoint-RCNN | Image processing | Geometric imaging |
مقاله انگلیسی |
2 |
Open code biometric tap pad for smartphones
باز کردن کد ضربه گیر بیومتریک برای تلفن های هوشمند-2021 Poor security practices among smartphone users, such as the use of simple, easily guessed passcodes for logins, are a result of the effort required to memorize stronger ones. In this paper, we devise a concept of ‘‘open code’’ biometric tap pad to authenticate smartphone users, which eliminates the need of memorizing secret codes. A biometric tap pad consists of a grid of buttons each labeled with a unique digit. The user attempting to log into the phone will tap these buttons in a given sequence. He/she will not memorize this tap sequence. Instead, the sequence will be displayed on the screen. The focus here is how the user types the sequence. This typing behavior is used for authentication. An open code biometric tap pad has several advantages, such as(1) users do not need to memorize passcodes, (2) manufacturers do not need to include extra sensors, and (3) onlookers have no chance to practice shoulder-surfing. We designed three tap pads and incorporated them into an Android app. We evaluated the performance of these tap pads by experimenting with three sequence styles and five different fingers: two thumbs, two index fingers, and the ‘‘usual’’ finger. We collected data from 33 participants over two weeks. We tested three machine learning algorithms: Support Vector Machine, Artificial Neural Network, and Random Forest. Experimental results show significant promise of open code biometric tap pads as a solution to the problem of weak smartphone security practices used by a large segment of the population. Keywords: Smartphone security | Behavioral biometrics | Touchscreen behavior | Open code | Biometric tap pad |
مقاله انگلیسی |
3 |
Pathophysiology of Advanced Heart Failure
پاتوفیزیولوژی نارسایی پیشرفته قلب-2021 The pathophysiologyof advanced heart failure (HF) can be characterized asa complex interplay ofdysregulated mechanisms comprising impaired hemodynamics, neurohormonal and proinflammatory
activation, dysfunctional cardiorespiratory reflex control, and inadequate energy handling, all of which
ultimately lead to multiorgan dysfunction; at the later stage of HF, numerous comorbidities, whose underlying pathophysiologiesoftenamplifyHFprogression,tendtodominatetheclinicalpicture and therapeutic approach, and some of these mechanisms have been identified as therapeutic targets in HF.
Blockade of the renin-angiotensin-aldosterone system (preferably with an angiotensin receptorneprilysin inhibitor, but alternatively with angiotensin-converting enzyme inhibitors or angiotensin receptor blockers together with mineralocorticoid receptor antagonist) and sympathetic nervous system (with b-blockers) is now considered a fundamental element of pharmacologic therapy for all patients with advanced HF and reduced ejection fraction. Autonomic modulation (vagal nerve stimulation or baroreflex stimulation) in advanced HF tends to benefit functional variables (qualityof life,NewYork HeartAssociation class, 6-minutewalking distance), whereas improvement in the outcomes (total mortality, HF hospitalizations) still remains uncertain. Fluid overload with central and/or peripheral congestion characterize the clinical picture of advanced HF and is the main reason for hospital admission in these patients; distinction of different clinical patterns of congestion with different underlying mechanisms may improve the management of fluid overload in advanced HF. Recent clinicaltrials have shown that the following novel therapiestargeting impairedpathophysiologic pathways in advanced HF seem to improve patients’ outcomes: (1) vericiguat, a soluble guanylate cyclase stimulator; (2) omecamtiv mecarbil, a selective cardiac myosin activator; (3) sodium-glucose cotransporter 2 inhibitors; (4) ferric carboxymaltose, for patients with concomitant iron deficiency. Better understanding of the pathophysiology underlying HF progression may allow characterization of novel mechanisms that can be targeted in order to revert to a natural pathway of HF development and progression. |
مقاله انگلیسی |
4 |
Management of Pediatric Atopic Dermatitis by Primary Care Providers: A Systematic Review
مدیریت درماتیت آتوپیک اطفال توسط ارائه دهندگان مراقبت های اولیه: مرور سیستماتیک-2021 BACKGROUND: Primary care providers (PCPs), including
pediatricians and general practitioners, are often the first to see
children with eczema/atopic dermatitis (AD). Little is known
about management of pediatric AD by PCPs and adherence to
national guidelines.
OBJECTIVE: To review existing literature examining management components of pediatric AD (topical corticosteroids
[TCS], topical calcineurin inhibitors [TCIs], antihistamines,
bathing, emollients, and diet) by PCPs.
DATA SOURCES: PubMed/Medline and Embase.
STUDY ELIGIBILITY CRITERIA: English-language articles dated
2015 to 2020 reporting outcomes addressing management of
pediatric AD by PCPs.
STUDY APPRAISAL AND SYNTHESIS METHODS: Two authors
independently screened titles/abstracts, reviewed full-text
articles, extracted relevant data, and evaluated study quality.
Disagreements were resolved by a third author.
RESULTS: Twenty articles were included. Surveys and
national database analyses were the most common methodologies (n = 7 each). PCPs commonly prescribed TCS but had a
preference for low-potency agents, overprescribed nonsedating
antihistamines, and avoided TCIs. PCPs commonly recommended emollients, although this was not universal. Data characterizing nonmedication management were limited.
LIMITATIONS: Most studies did not examine individual patient
encounters, but rather relied on providers reporting their general behaviors. Provider behavior may vary based on country
of practice.
CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS: Knowledge and management gaps exist among PCPs in treating pediatric AD in key areas including knowledge of TCS safety
profiles and prescribing of TCIs. The current literature is
largely limited to small studies that evaluate prescribing
behaviors with limited data characterizing nonmedication
management, highlighting the need for future research in this
area.
KEYWORDS: atopic dermatitis | eczema | health care delivery | primary care provider | pediatric |
مقاله انگلیسی |
5 |
Physicians knowledge and practice concerning diagnosis and management of anaphylaxis: The situation in Egypt
دانش و عمل پزشکان در مورد تشخیص و مدیریت آنافیلاکسی: وضعیت در مصر-2021 Introduction: Early recognition of an anaphylaxis event is crucial for instituting lifesaving management. We
sought to explore knowledge and practice towards anaphylaxis in a sample of physicians from ten Egyptian
governorates.
Methods: An eighteen question-based questionnaire was developed by expert allergists to evaluate the knowledge and practice towards anaphylaxis, based on the World Allergy Organization guidelines for the assessment and management of anaphylaxis. The questionnaires were distributed, and the answered forms collected via emails, and data were tabulated, and analysed. Results: In this cross-sectional study, a total of 242 physicians completed the survey (183 (75.6%) paediatricians, 32 (13.2%) internists, 22 (9.1%) intensivists and five (2.1%) anaesthetists). Only 91 participants (37.6%) identified all the four proposed anaphylaxis clinical scenarios while 70, 45 and 36 identified three, two and one scenario, respectively. Loss of consciousness and abdominal symptoms were not recognised as possible presentations of anaphylaxis by 64.5% and 80.2% of the participants, respectively. Epinephrine was considered the first line treatment by 98 (40.5%), corticosteroids by 77 (31.8%) and antihistamines by 25 (10.3%). 75 (31%) responders identified the right dose of epinephrine while 119 (49.2%) identified the proper route. Concerning practice, 83 physicians (39.2%) used epinephrine for all cases of anaphylaxis, 88 (41.5%) used it for refractory cases only whereas 41 (19.3%) did not use epinephrine at all. Discussion: Our survey shows that the knowledge of Egyptian physicians and their practice towards anaphylaxis are still inadequate. The current situation reinforces the need to disseminate and encourage the adoption of the international guidelines for anaphylaxis diagnosis and treatment. keywords: آنافیلاکسی | اپینفرین | واکنش های آلرژیک کشنده | دانش | تمرین | Anaphylaxis | Epinephrine | Fatal allergic reactions | Knowledge | Practice |
مقاله انگلیسی |
6 |
Mapping foodborne pathogen contamination throughout the conventional and alternative poultry supply chains
نقشه برداری از آلودگی پاتوژن ناشی از مواد غذایی در سراسر زنجیره های تأمین مرغ های متداول و جایگزین-2021 Recently, there has been a consumer
push for natural and organic food products. This
has caused alternative poultry production, such as
organic, pasture, and free-range systems, to grow in
popularity. Due to the stricter rearing practices of
alternative poultry production systems, different
types of levels of microbiological risks might be
present for these systems when compared to conventional production systems. Both conventional
and alternative production systems have complex
supply chains that present many different
opportunities for flocks of birds or poultry meat to
be contaminated with foodborne pathogens. As
such, it is important to understand the risks
involved during each step of production. The purpose of this review is to detail the potential routes
of foodborne pathogen transmission throughout the
conventional and alternative supply chains, with a
special emphasis on the differences in risk between
the two management systems, and to identify gaps
in knowledge that could assist, if addressed, in
poultry risk-based decision making.
Key words: broilers | alternative broiler production | Salmonella | Campylobacter | organic |
مقاله انگلیسی |
7 |
ارتقای تحلیل قابلیت اطمینان انسان برای سیستمهای ریلی با استفاده از منطق فازی
سال انتشار: 2021 - تعداد صفحات فایل pdf انگلیسی: 15 - تعداد صفحات فایل doc فارسی: 40 اتحادیهی بینالمللی راهآهن در گزارش ایمنی سالانهی خود بر این نکته تأکید دارد که هر ساله عامل انسانی یکی از علل اصلی حوادث ریلی به شمار میآید. در نتیجه، مطالعهی قابلیت اطمینان انسان یک اصل اساسی بوده و بایستی در ارزیابی کامل قابلیت اطمینان برای تمامی سیستمهای ریلی گنجانده شود. بااینحال، RARA (ارزیابی قابلیت اطمینان عملکرد ریلی) تنها رویکرد موجود در متون و مقالات است که عملکرد انسان را لحاظ نموده و مختص به کاربردهای ریلی است. اشکال اصلی RARA تأثیر ذهنیت متخصص و دشواری ارزیابی عددی برای پارامترهای مدل در نبود یک پایگاه دادهی جامع برای خطا و حوادث ترافیکی است. این مقاله یک مدل فازی نوآورانه برای ارزیابی عامل انسانی در سیستمهای حساس به ایمنی برای کاربردهای ریلی جهت حل و فصل مشکلات بیانشده ارائه میدهد. منطق فازی امکان سادهسازی ارزیابی پارامترهای مدل با استفاده از متغیرهای کلامی بسیار شبیه به فرایند شناختی انسان را فراهم میآورد. به علاوه، این با شیوهای به مراتب بهتر از روش قطعی کلاسیک با دادههای ناقص و فاقد عدم قطعیت برخورد نموده و انتزاعی بودن ارزیابی تحلیلگر را به حداقل میرساند. خروجی الگوریتم پیشنهادی، نتیجهی محاسبات بازهای فازی، نظریهی α-cut و روش فازیزدایی مرکز ثقل است. روش پیشنهادی برای عملکردهای انسانی انجامگرفته در یک سیستم پیامرسانی ریلی استفاده شده است. چهار اقدام انسانی و دو سناریو جهت تحلیل عملکرد الگوریتم پیشنهادی شبیهسازی شدند. نهایتاً نتایج این روش با روش RARA کلاسیک مقایسه شده و بیانگر نتایج سازگار با رویکردی سادهتر و شهودیتر با پیچیدگی کمتر است.
کلیدواژه ها: منطق فازی | عوامل انسانی | مهندسی قابلیت اطمینان | مهندسی راهآهن | تعمیرات و نگهداری |
مقاله ترجمه شده |
8 |
Modeling the key factors influencing the reduction of food loss and waste in fresh produce supply chains
مدلسازی عوامل کلیدی موثر در کاهش اتلاف مواد غذایی و ضایعات موجود در زنجیره های تأمین محصولات تازه-2021 The purpose of this study is to develop a comprehensive framework by identifying and analyzing the key factors influencing the reduction of food loss and waste (FLW) in fresh produce supply chains (FPSCs) in developing countries, specifically India. This empirical study has identified eight influencing factors, representing the given context, from the literature (using content analysis) under the purview of management theories (namely, stakeholder theory, capabilities-based theory, and critical success factors theory) as well as data collected through semi-structured interviews from a group of selected experts. Further, Interpretive Structural Modeling (ISM) technique and Matriced’ Impacts Croise’s Multiplication Appliquee an un Classement (MICMAC) analysis are used as an integrated method to analyze the identified factors. Regulatory bodies and food policy along with market infrastructure are the most significant factors and have a high tendency to influence the reduction of FLW in FPSCs; therefore, require utmost consideration. The findings of this study are expected to enable managers and policy makers to uncover and understand the key factors. The insights from the findings will help in formulating policies and making strategic decisions regarding the reduction of FLW in FPSCs which will help in attaining sustainable development goals target on FLW. Keywords: Food loss and waste | Fresh produce supply chain | India | Interpretive structural modeling | Sustainable development goals |
مقاله انگلیسی |
9 |
A measurement method of motion parameters in aircraft ground tests using computer vision
روش اندازه گیری پارامترهای حرکت در آزمایش های زمینی هواپیماها با استفاده از بینایی ماشین-2021 The purpose of this work is aiming at the problem of high precision and large-scale measurement of motion parameters of aircraft ground test. Based on the traditional vision measurement method of motion parameters, a new measurement method of motion parameters based on intersected planes is discussed. Firstly, the measurement of 3D coordinates of laser spots was performed using the 3 D vision technique combined with plane constraints of curtain wall, the images of laser spot projected on the parallel curtain wall were processed using the centroid method, the calibration of multi-coordinates were unified by the unique coordinate system method, then the pose was solved using the proposed method that the normal vector of the intersect plane fixed on the vehicle is used. Finally, according to the measurement principle, the influence of spot center positioning, camera parameter calibration and target geometric error on the calculation results of aircraft motion parameters is analyzed, and the error propagation model is given. The experimental results show that in the measurement range of 8000 mm × 4000 mm × 4000 mm, the measurement error of attitude parameters is less than 0.14◦, and the measurement error of position parameters is less than 2 mm. Compared with binocular stereo vision, the accuracy of attitude angle measurement is improved by 100%. Therefore, the measurement method proposed in this paper can achieve high precision and large-scale measurement of the motion parameters of the test aircraft. Keywords: Machine vision | Aircraft ground test | Intersected planes | Motion parameters | Muti-coordinate system calibration |
مقاله انگلیسی |
10 |
Two-echelon supply chain network design with trade credit
Two-echelon supply chain network design with trade credit-2021 This study considers a two-echelon supply chain that is comprised of an outside vendor, multiple distribution centers (DCs), and multiple retailers. The retailers have access to trade credit offered by upstream suppliers. We propose an integrated DC-retailer network design model that optimizes trade credit terms and safety stock levels, in addition to the decisions of DC locations, DC-retailer assignments, and inventory replenishment policies typically considered in the literature. The operating and handling cost is concave and non-decreasing to capture economies of scale whereas most existing studies simply assume that such cost is linear in demand. Trade credit financing cost is characterized in a way that preserves the important mathematical structure of the classic warehouse retailer network design model. Leveraging on the sub modularity property of the cost components, we developed a polymatroid cutting-plane solution algorithm, which is effective for practically sized problem in- stances in numerical experiments. The results show that incorporating trade credit financing into supply chain network design may substantially reduce the total cost. Further, our study suggests a more consolidated supply chain network when either the safety stock or financing cost increases. Interestingly, as financing cost rises, a high-volume and low-frequency reorder pattern is favored, but the opposite is recommended when financing gain increases. The variation of each individual cost component is also analyzed for an in-depth understanding of the impact of operational and financial parameters on supply chain optimization. Keywords: Network design | OWMR system | Multi-echelon inventory management | Trade credit | Polymatroid cutting plane |
مقاله انگلیسی |