دانلود و نمایش مقالات مرتبط با Myopia::صفحه 1
بلافاصله پس از پرداخت دانلود کنید

با سلام خدمت کاربران در صورتی که با خطای سیستم پرداخت بانکی مواجه شدید از طریق کارت به کارت (6037997535328901 بانک ملی ناصر خنجری ) مقاله خود را دریافت کنید (تا مشکل رفع گردد). 

نتیجه جستجو - Myopia

تعداد مقالات یافته شده: 6
ردیف عنوان نوع
1 The role of peripheral ocular length and peripheral corneal radius of curvature in determining refractive error
نقش طول چشم محیطی و شعاع انحنای قرنیه محیطی در تعیین خطای شکست-2021
Purpose: The purpose of this study was to extend the knowledge of peripheral biometric component and its relationship to refractive status in healthy individuals by determining the correlation between peripheral ocular length to peripheral corneal radius ratio and the refractive error.
Methods: This prospective study was conducted on thirty-three healthy adult participants. Refractive error was assessed objectively and subjectively and recorded as the mean spherical equivalent. Central and peripheral ocular lengths at 30◦ were assessed using partial coherence interferometry under dilation with 1% tropicamide. Central and peripheral corneal radius of curvature was assessed using Scheimpflug topography. Peripheral ocular lengths at 30◦ were paired with peripheral corneal curvatures at the incident points of the IOLMaster beam (3.8 mm away from corneal apex) superiorly, inferiorly, temporally and nasally to calculate the peripheral ocular length-peripheral corneal radius ratio. Descriptive statistics were used to describe the distribution and spread of the data. Pearson’s correlation analysis was used to present the association between biometric and refractive variables.
Results: Refractive error was negatively correlated with the axial length-central corneal radius ratio (r = −0.91; p < 0.001) and with 30◦ peripheral ocular length-peripheral corneal radius ratio in all four meridians (r ≤ −0.76; p < 0.001). The strength of the correlation was considerably lower when only axial length or peripheral ocular lengths were used.
Conclusion: Using the ratios of peripheral ocular length-peripheral corneal radius to predict refractive error is more effective than using peripheral corneal radius or peripheral ocular length alone.
KEYWORDS: Refractive error | Myopia | Peripheral ocular length | Peripheral corneal radius of curvature | Axial length
مقاله انگلیسی
2 Vision-related quality of life of Chinese children undergoing orthokeratology treatment compared to single vision spectacles
کیفیت زندگی مرتبط با بینایی کودکان چینی تحت درمان ارتوکراتولوژی در مقایسه با عینک های بینایی مجرد-2021
Objective: To measure and compare the vision-related quality of life between Chinese children wearing orthokeratology (ortho-k) lenses and single vision spectacles, to understand acceptance of ortho-k treatment by children in China.
Methods: Subjects of Chinese origin, with myopia of -5.00 to -0.75 D, astigmatism < 1.50 D were recruited. All subjects had been wearing optical correction – ortho-k lenses or single vision spectacles (SVS), for the past 12–18 months and were aged between 8–12 years. The Pediatric Refractive Error Profile (PREP) questionnaire, translated to Chinese, was used to evaluate the perceptions of children wearing spectacles in overall vision, near vision, far vision, symptoms, appearance, satisfaction, activities, academic performance, handling of optical corrections, and peer perceptions. PREP questions, rephrased to address the same issues for ortho-k subjects who did not wear spectacles in the daytime, were used for ortho-k wearers (PREP-OK). The mean score of all items was calculated as the overall score. For ortho-k wearers, four additional questions on experience and frequency of symptoms: experiencing difficulty in falling asleep, ocular discomfort, itchy/burning/dry eyes, and foreign body sensation during ortho-k lens wear at night were asked and reported separately.
Results: Forty subjects (20 ortho-k, 20 SVS) completed the study. Overall vision, far vision, appearance, satisfaction, activities, and peer perception scores in the ortho-k group were significantly better than the SVS group (all P < 0.05). Handling of optical correction score in the ortho-k group was significantly worse than the SVS group (P = 0.04). No significant differences in near vision, symptoms in the daytime and academic performance were found between two groups (P > 0.05). With respect to symptoms during ortho-k lens wear at night, none of the subjects reported difficulty in falling asleep, but 30–40 % of subjects reported occasional ocular discomfort, itchy/burning/dry eyes, and foreign body sensation after lens insertion.
Conclusion: Although ortho-k may induce some ocular discomfort with lens wear during the night, these were infrequent and the benefits from ortho-k can compensate for the discomfort, leading to better vision-related quality of life in Chinese children, compared with those wearing SVS.
Keywords: Orthokeratology | Spectacles | Symptoms | Vision-related quality of life | Children
مقاله انگلیسی
3 Information acquisition and voluntary disclosure with supply chain and capital market interaction
کسب اطلاعات و افشای داوطلبانه با تعامل زنجیره تأمین و بازار سرمایه-2021
We investigate a firm’s information acquisition and voluntary disclosure decisions regarding demand forecast information. We study the interaction among the firm, its supplier, and the external capital market investors who assess the firm’s interim equity price. We first analyze when it is beneficial for the firm to acquire demand forecast information, and if such information is acquired, when the firm should disclose it to the supplier and investors. Then, we investigate how the firm’s information acquisition and disclosure decisions influence the investors’ and the supplier’s pricing strategies. We show that the optimal information disclosure policy for the firm is highly dependent on the corporate myopia level (CML): when the CML is low, the firm discloses low demand information only; when the CML is medium, the firm always withholds demand information; and when the CML is high, the firm discloses high demand information only. Our findings provide a novel plausible explanation to firms’ non-disclosure behaviors commonly observed in practice and highlight the importance of considering the interaction between the supply chain and the capital market.
Keywords: Supply chain management | Information acquisition | Voluntary disclosure | Capital market interaction | Game theory
مقاله انگلیسی
4 Online pricing of demand response based on long short-term memory and reinforcement learning
قیمت گذاری آنلاین پاسخ تقاضا براساس حافظه کوتاه مدت طولانی و یادگیری تقویتی-2020
Incentive-based demand response is playing an increasingly important role in ensuring the safe operation of the power grid and reducing system costs, and advances in information and communications technology have made it possible to implement it online. However, in regions where incentive-based demand response has never been implemented, the response behavior of customers is unknown, in this case, how to quickly and accurately set the incentive price is a challenge for service providers. This paper proposes a pricing method that combines long short-term memory networks and reinforcement learning to solve the pricing problem of service providers when the customers’ response behavior is unknown. Taking the total profit of all response time slots in one day as the optimization goal, long and short-term memory networks are used to learn the relationship between customers’ response behavior and incentive price, and reinforcement learning is used to explore and determine the optimal price. The results show that the combination of these two methods can perform virtual exploration of the optimal price, which solves the disadvantage that reinforcement learning can only rely on delayed rewards to perform exploration in the real scene, thereby speeding up the process of setting the optimal price. In addition, because the influence of the incentive prices combination of different time slots on the profit of the service provider is considered, the negative effect of myopia optimization is avoided.
Keywords: Demand response | Online pricing | Reinforcement learning | Long short-term memory
مقاله انگلیسی
5 Managerial myopia and the mortgage meltdown
نزدیک بینی مدیریتی و گداختگی رهنی-2018
Prominent policy makers assert that managerial short-termism was at the root of the subprime crisis of 2007–2009. Prior scholarly research, however, largely rejects this assertion. Using a more comprehensive measure of Chief Executive Officer (CEO) incentives for short-termism, we uncover evidence that short-termism indeed played a role. Firms whose CEOs were contractually allowed to sell or exercise more of their stock and options holdings sooner had more subprime exposure, a higher probability of financial distress, and lower risk-adjusted stock returns during the crisis, as well as higher fines and settlements for subprime-related fraud.
keywords: Financial crisis |Subprime mortgages |Financial fraud |CEO incentives |CEO pay
مقاله انگلیسی
6 ابعاد مهم در نظریه مدیریت استراتژیک
سال انتشار: 2012 - تعداد صفحات فایل pdf انگلیسی: 10 - تعداد صفحات فایل doc فارسی: 18
نظریه مدیریت استراتژیک تا کنون موفق به ارائه راهکارهایی برای تمام مشکلات مفهومی و عملی مطرح شده از سوی متخصصان نشده است. علاوه بر این، در شرایط بحران اقتصادی کنونی، مختصات تحلیل استراتژیک و برنامه ریزی استراتژیک باید با هدف ارائه راهکارهای منطبق با مشکلات کنونی پیش روی سازمان ها بازتعریف شود. سناریوهای بازیابی استراتژیک شرکت ها باید از سناریوهای بازیابی اقتصاد کلان پیروی کنند، در نتیجه تلاش شرکت ها دیگر در سطح اقتصاد کلان پیامدی ایجاد نخواهد کرد. این اقدام انتقادی قصد دارد مجموعه ای از محدودیت های مفاهیم مدیریت استراتژیک را توضیح بدهد و نشان دهد که از چه رویکردهایی می توان برای ایجاد مفاهیم جدید استفاده کرد و کدام یک رویکرد مناسب تری است.
کلیدواژه ها: سناریوی بازیابی | برنامه ریزی استراتژیک | مدیریت استراتژیک پایدار | نزدیک بینی استراتژیک | نسبیت استراتژیک.
مقاله ترجمه شده
rss مقالات ترجمه شده rss مقالات انگلیسی rss کتاب های انگلیسی rss مقالات آموزشی
logo-samandehi
بازدید امروز: 6255 :::::::: بازدید دیروز: 3097 :::::::: بازدید کل: 40522 :::::::: افراد آنلاین: 49