|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 基于运动矢量细化的帧率上变换与HEVC结合的视频压缩算法显示文摘将帧率变换技术与新型视频压缩编码标准HEVC相结合有利于提升视频的压缩效率。针对直接利用HEVC码流信息中的低帧率视频的运动矢量进行帧率上变换时效果不理想的问题,文中提出了一种基于运动矢量细化的帧率上变换与HEVC结合的视频压缩算法。首先,在编码端对原始视频进行抽帧,降低视频帧率;其次,对低帧率视频进行HEVC编解码;然后,在解码端与从HEVC码流中提取出的运动矢量相结合,利用前向-后向联合运动估计对其进行进一步的细化,使细化后的运动矢量更加接近于对象的真实运动;最后,利用基于运动补偿的帧率上变换技术将视频序列恢复至原始帧率。实验结果表明,与HEVC标准相比,所提算法在同等视频质量下可节省一定的码率。同时,与其他算法相比,在节省码率相同的情况下,所提算法重建视频的PSNR值平均可提升0.5 dB。 | 蔡于涵 熊淑华 孙伟恒 Karn Pradeep 何小海 | 2020 | 计算机科学2020，47，2： | 8 |
| 2 | Use of the Endocuff during routine colonoscopy examination improves adenoma detection: A meta-analysis显示文摘AIM To perform meta-analysis of the use of Endocuff during average risk screening colonoscopy.METHODS Scopus, Cochrane databases, MEDLINE/Pub Med, and CINAHL were searched in April 2016. Abstracts from Digestive Disease Week, United European Gastroenterology, and the American College of Gastroenterology meeting were also searched from 2004-2015. Studies comparing EC-assisted colonoscopy(EAC) to standard colonoscopy, for any indication, were included in the analysis. The analysis was conducted by using the Mantel-Haenszel or DerS imonian and Laird models with the odds ratio(OR) to assess adenoma detection, cecal intubation rate, and complications performed. RESULTS Nine studies(n = 5624 patients) were included in the analysis. Compared to standard colonoscopy, procedures performed with EC had higher frequencies for adenoma(OR = 1.49, 95%CI: 1.23-1.80; P = 0.03), and sessile serrated adenomas detection(OR = 2.34 95%CI: 1.63-3.36; P < 0.001). There was no significant difference in cecal intubation rates between the EACgroup and standard colonoscopy(OR = 1.26, 95%CI: 0.70-2.27, I2 = 0%; P = 0.44). EAC was associated with a higher risk of complications, most commonly being superficial mucosal injury without higher frequency for perforation.CONCLUSION The use of an EC on colonoscopy appears to improve pre-cancerous polyp detection without any difference in cecal intubation rates compared to standard colonoscopy. | Matthew Chin William Karnes M Mazen Jamal John G Lee Robert Lee Jason Samarasena Matthew L Bechtold Douglas L Nguyen | 2016 | World Journal of Gastroenterology2016，22，43： | 4 |
| 3 | Initial venous lactate levels as a predictor of mortality in severe sepsis: a single-center retrospective cohort study显示文摘Sepsis is the most common cause of death among critically ill patients.[1]Accordingly,most patients with sepsis are diagnosed and initially treated in the emergency department(ED).[2]Moreover,some studies have shown that early resuscitation is an important determinant of sepsis survival.[2,3] | Thidathit Prachanukool Pitsucha Sanguanwit Karn Suttapanit Chaiyaporn Yuksen Piraya Vichiensanth | 2022 | World Journal of Emergency Medicine2022，13，5： | 2 |
| 4 | Greater Endothelial Dysfunction and Arterial Stiffness in Men With Chronic Prostatitis/Chronic Pelvic Pain Syndrome—A Possible Link to Cardiovascular Disease显示文摘 | Daniel A. Shoskes Donna Prots Jeffrey Karns Joi Horhn Aaron C. Shoskes | 2011 | The Journal of Urology2011，，3： | 2 |
| 5 | Conversion enhancement of tubular fixed-bed reactor for Fischer-Tropsch synthesis using static mixer显示文摘Recently,Fischer-Tropsch synthesis(FTS) has become an interesting technology because of its potential role in producing biofuels via Biomassto-Liquids(BTL) processes.In Fischer-Tropsch(FT) section,biomass-derived syngas,mainly composed of a mixture of carbon monoxide(CO) and hydrogen(H2),is converted into various forms of hydrocarbon products over a catalyst at specified temperature and pressure.Fixed-bed reactors are typically used for these processes as conventional FT reactors.The fixed-bed or packed-bed type reactor has its drawbacks,which are heat transfer limitation,i.e.a hot spot problem involved highly exothermic characteristics of FT reaction,and mass transfer limitation due to the condensation of liquid hydrocarbon products occurred on catalyst surface.This work is initiated to develop a new chemical reactor design in which a better distribution of gaseous reactants and hydrocarbon products could be achieved,and led to higher throughput and conversion.The main goal of the research is the enhancement of a fixed-bed reactor,focusing on the application of KenicsTM static mixer insertion in the tubular packed-bed reactor.Two FTS experiments were carried out using two reactors i.e.,with and without static mixer insertion within catalytic beds.The modeled syngas used was a mixed gas composed of H2/CO in 2:1 molar ratio that was fed at the rate of 30mL(STP)min1(GHSV≈136mL g1 cat h1) into the fixed Ru supported aluminum catalyst bed of weight 13.3g.The reaction was carried out at 180℃ and atmospheric pressure continuously for 36h for both experiments.Both transient and steady-state conversions(in terms of time on stream) were reported.The results revealed that the steady-state CO conversion for the case using the static mixer was approximately 3.5 times higher than that of the case without static mixer.In both cases,the values of chain growth probability of hydrocarbon products(α) for Fischer-Tropsch synthesis were 0.92 and 0.89 for the case with and without static mixer,respectively. | Phavanee Narataruksa Sabaithip Tungkamani Karn Pana-Suppamassadu Phongsak Keeratiwintakorn Siriluck Nivitchanyong Piyapong Hunpinyo Hussanai Sukkathanyawat Prayut Jiamrittiwong Visarut Nopparat | 2012 | Journal of Natural Gas Chemistry2012，21，4： | 2 |
| 6 | 生物可吸收支架进展及前景显示文摘已有系列临床研究证实生物可吸收支架(BVS)的安全性和有效性。与药物洗脱支架相比,BVS的优点是主要不良心脏事件及支架内再狭窄率较低,但在减少支架内血栓方面并无优势,可能与不充分的抗血小板治疗、支架厚度及支架扩张不全有关。该文主要介绍BVS中应用经验较多的Absorb支架。 | 陆寒新 Shailendra Kumar Karn 车文良 徐亚伟 | 2016 | 国际心血管病杂志2016，43，2： | 2 |
| 7 | Outcomes of kidney transplantation in patients with hepatitis B virus infection:A systematic review and meta-analysis显示文摘AIM To assess outcomes of kidney transplantation including patient and allograft outcomes in recipients with hepatitis B virus(HBV) infection, and the trends of patient's outcomes overtime.METHODS A literature search was conducted using MEDLINE, EMBASE and Cochrane Database from inception through October 2017. Studies that reported odds ratios(OR) of mortality or renal allograft failure after kidney transplantation in patients with HBV [defined as hepatitis B surface antigen(HBs Ag) positive] were included. The comparison group consisted of HBs Agnegative kidney transplant recipients. Effect estimates from the individual study were extracted and combined using random-effect, generic inverse variance method of Der Simonian and Laird. The protocol for this metaanalysis is registered with PROSPERO(International Prospective Register of Systematic Reviews; no. CRD42017080657).RESULTS Ten observational studies with a total of 87623 kidney transplant patients were enrolled. Compared to HBs Ag-negative recipients, HBs Ag-positive status was significantly associated with increased risk of mortality after kidney transplantation(pooled OR = 2.48; 95%CI: 1.61-3.83). Meta-regression showed significant negative correlations between mortality risk after kidney transplantation in HBs Ag-positive recipients and year of study(slopes =-0.062, P = 0.001). HBs Agpositive status was also associated with increased risk of renal allograft failure with pooled OR of 1.46(95%CI: 1.08-1.96). There was also a significant negative correlation between year of study and risk of allograft failure(slopes =-0.018, P = 0.002). These associations existed in overall analysis as well as in limited cohort of hepatitis C virus-negative patients. We found no publication bias as assessed by the funnel plots and Egger's regression asymmetry test with P = 0.18 and 0.13 for the risks of mortality and allograft failure after kidney transplantation in HBs Ag-positive recipients, respectively.CONCLUSION Among kidney transplant patients, there are significant associations between HBs Ag-positive status and poor outcomes including mortality and allograft failure. However, there are potential improvements in patient and graft survivals in HBs Ag-positive recipients overtime. | Charat Thongprayoon Wisit Kaewput Konika Sharma Karn Wijarnpreecha Napat Leeaphorn Patompong Ungprasert Ankit Sakhuja Franco H Cabeza Rivera Wisit Cheungpasitporn | 2018 | World Journal of Hepatology2018，10，2： | 2 |
| 8 | 结合卷积神经网络的HEVC帧内编码压缩改进算法显示文摘近年来,卷积网络深度学习已在图像处理、目标检测等领域取得巨大成功。受其启发,将卷积神经网络(CNN)应用于传统视频压缩标准已成为一个新的研究热点。本文提出一种集成卷积神经网络的高效视频编码(HEVC)压缩改进算法,将下采样过程、HEVC的编解码过程、上采样及质量增强过程集成为一体。为高效提取视频帧的结构特征,在所提压缩算法中集成了两个卷积神经网络。提出了一种下采CNN(DwSCNN)代替双三次下采,在有效降低分辨率的同时保留细节信息,得到更为紧凑的低分辨率视频序列,将此低分辨率视频序列通过HEVC帧内编码进行进一步的数据量压缩,通过提出一个质量增强CNN(PPCNN)来改善解码后恢复到原始分辨率的降质视频序列。实验结果显示,本文压缩改进算法在低码率段与标准HEVC相比,能达到更好的质量重建,并且在接近一致的PSNR值时,能节省39.46%的时间和11.04%的比特率,本文算法的视频压缩性能优于HEVC标准算法和相关文献方法。 | 王婷 何小海 孙伟恒 熊淑华 Karn Pradeep | 2020 | 太赫兹科学与电子信息学报2020，18，2： | 2 |
| 9 | 慢性乙型肝炎患者替比夫定治疗达完全应答后序贯普通干扰素巩固治疗的疗效观察显示文摘目的对接受替比夫定(LDT)治疗的HBeAg阳性慢性乙型肝炎患者获完全应答后,比较序贯干扰素(IFN)巩固治疗或单一LDT巩固治疗的疗效;并探索治疗期间血清HBsAg水平对停药后持续应答的预测价值。方法对20例接受LDT治疗的HBeAg阳性慢性乙性肝炎患者获完全应答后,继续LDT治疗6个月,然后分为序贯IFN巩固组或单一LDT巩固组。序贯IFN巩固组给予IFNα-1b治疗6个月;单一LDT巩固组继续给予LDT治疗6个月。分别在停药后1、2、3、6、9、12个月及之后每半年随访1次,肝功能采用全自动生物化学分析仪检测;血清HBVDNA定量采用实时荧光定量PCR法检测;HBsAg定量采用化学发光法检测。率的比较采用Fisher精确概率法、组间均数比较采用f检验;血清HBsAg水平对停药后复发的预测价值用受试者工作特征曲线分析。结果序贯IFN组与单一LDT组的复发率分别为30%、40%,差异无统计学意义(P〉0.05)。LDT治疗24周时血清HBsAg水平下降幅度的受试者工作特征曲线下面积为0.689,大于治疗12周的0.652、48周的0.545。24周时血清HBsAg水平下降幅度对停药后持续应答有一定的预测价值,差异有统计学意义(P〈0.05);治疗24周时血清HBsAg水平下降幅度≥1000IU/ml的患者其持续应答率较下降幅度〈1000IU/ml的患者高[90.9%(10/11)与33.3%(3/9),P〈0.05]。治疗结束时血清HBsAg水平〈200IU/rnl的患者持续应答率高于≥200IU/ml的患者[100%与53.3%,P〈0.05]。结论序贯普通IFN0α-1b巩固治疗并不能降低停药后复发率。LDT治疗24周时血清HBsAg水平下降幅度≥1000IU/ml的患者其持续应答率高于下降幅度〈1000IU/ml的患者。 | 张玮 Sandeep Kumar Karn 张琼方 郭树华 张大志 | 2013 | 中华肝脏病杂志2013，21，8： | 2 |
| 10 | SATB1 geneexpression and breast cancer prognosis显示文摘 | Hanker LC Karn T Mavrova-Risteska L | 2011 | Breast2011，20，4： | 1 |
| 11 | The Prevalence by Staged Severity of Various Types of Diabetic Neuropathy, Retinopathy, and Nephropathy in a Population-based Co- hort: The Rochester Diabetic Neuropathy Study显示文摘 | Dyck P J Kratz K M Karnes J L | 1993 | Neurolo- gy1993，43，4： | 1 |
| 12 | Proliferation and estrogen signaling can distinguish patients at risk for early versus late relapse among estrogenreceptor positive breast cancers 显示文摘 | Bianehini G Pusztai L Karn T | | Breast Cancer Res0，15，5： | 1 |
| 13 | Characterization andstability studies of a novel liposomal cyclosporin A preparedusing the supercritical fluid method:comparison with the modified conventional Bangham method显示文摘 | Karn PR Cho W Park HJ | 2014 | Int JNanomedcine2014，8，： | 1 |
| 14 | Etiopathogenesis of acute pancreatitis显示文摘 | Karne S Gorelick FS | 1999 | Surg Clin North Am1999，79，4： | 1 |
| 15 | The Capture and Destruction of Escherichia coli from Simulated Urban Runoff Using Conventional Bioretention Media and Iron Oxide-coated Sand显示文摘 | Zhang Lan Seagren Eric A Davis Allen P Karns Jeffrey S | 2010 | Water Environment Research2010，，8： | 1 |
| 16 | Oral tranexamic acid forthe treatment of melasma 显示文摘 | Karn D Kc S Amatya A | 2012 | Kathmandu Univ Med J(KUAAJ )2012，10，： | 1 |
| 17 | An argon-laser fluorometer for optimum determination of 5-bromomethylfluorescein derivatized carboxylic acids显示文摘 | MUKHERJEE P S DESILVA K H KARNES H T | 1996 | Microchimica Acta1996，124，： | 1 |
| 18 | Ocular and systemic autoimmunity after successful tumor-infihrating lymphocyte immunotherapy for recurrent, metastatic melanoma 显示文摘 | Yeh S Karne NK Kerkar SP | 2009 | Ophthalmology2009，116，5： | 1 |
| 19 | 5-Bromomethyl fluorescein (5-BMF) for derivatization of carboxyl containing analytes for use with laser-induced fluorescence detection显示文摘 | MUKHERJEE P S DESILVA K H KARNES H T | 1995 | Pharmaceutical Research1995，12，： | 1 |
| 20 | Gas transport through sections of solid coal显示文摘 | Karn F S Friedel R A Thames B M | 1970 | Fuel1970，49，3： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员