摘要：针对DCASE2017挑战赛的声场环境数据集,提取梅尔频率倒谱系数(MFCC)、短时能量(SE)、声学事件似然特征(AELF)、静音时间(MT)特征,组成多特征融合矩阵,通过对比多种核函数和寻优算法,最终选取高斯径向基核函数(RK)建立支持向量机(SVM)模型,采用交叉验证(CV)方法进行SVM参数寻优,对15种声学场景进行分类.实验结果表明,杂货店、办公室的分类准确性达到了90%以上,平均分类准确性达到71.11%,远高于挑战赛的基线系统61%的平均分类准确性.

摘要：Colorectal cancer(CRC)remains one of the major causes of death worldwide,despite steady improvement in early detection and overall survival over the past *** treatment paradigms,with chemotherapy and biologics,appear to have reached their maximum ***,especially with checkpoint inhibitors,has shown considerable clinical benefit in various cancers,including mismatch-repair-deficient *** has led to the planning and initiation of several clinical trials evaluating novel immunotherapy agents—as single agents,combinations and in conjunction with chemotherapy—in patients with *** article reviews biological and preclinical data for checkpoint inhibitors and discusses various immunotherapy trials in CRC,as well as current efforts in CRC immunotherapy.

摘要：In this paper we describe how the test design can be done by using the Combinatorial Testing approach for internet of things operating systems. Contiki operating system is taken as a case study but we discuss what can be the approach for RIOT and Tiny OS operating systems. We discuss how the combinatorial coverage measurement can be gathered in addition to the traditional metrics code coverage. The test design generated by using Advanced Combinatorial Testing for Software is analyzed for Contiki operating system. We elaborate the code coverage gathering technique for Contiki simulator which happens to be in Java. We explain the usage of Combinatorial Coverage Measurement tool. Although we have explained the test design methodology for internet of things operating systems, the approach explained can be followed for other open source software.

摘要：Steganography techniques are used in Multimedia data transfer to prevent adversaries from eaves dropping. Synchronized audio to audio steganography deals with recording the secret audio, hiding it in another audio file and subsequently sending to multiple receivers. This paper proposes a Multilevel Access control in Synchronized audio steganography, so that Audio files which are meant for the users of low level class can be listened by higher level users, whereas the vice-versa is not allowed. To provide multilevel access control, symmetric polynomial based scheme is used. The steganography scheme makes it possible to hide the audio in different bit locations of host media without inviting suspicion. The Secret file is embedded in a cover media with a key. At the receiving end the key can be derived by all the classes which are higher in the hierarchy using symmetric polynomial and the audio file is played. The system is implemented and found to be secure, fast and scalable. Simulation results show that the system is dynamic in nature and allows any type of hierarchy. The proposed approach is better even during frequent member joins and leaves. The computation cost is reduced as the same algorithm is used for key computation and descendant key derivation. Steganography technique used in this paper does not use the conventional LSB’s and uses two bit positions and the hidden data occurs only from a frame which is dictated by the key that is used. Hence the quality of stego data is improved.

摘要：在中国和印度边远地区，治疗心血管病的经济负担十分沉重，但是这些地区经济落后，医疗保健资源有限。该研究旨在设计和评估由社区医护人员（community health workers，CHW）实施，

摘要：This study assessed the regional climate models (RCMs) employed in the Coordinated Regional climate Downscaling Experiment (CORDEX) South Asia framework to investigate the qualitative aspects of future change in seasonal mean near surface air temperature and precipitation over the Hindu Kush Himalayan (HKH) region. These RCMs downscaled a subset of atmosphere ocean coupled global climate models (AOGCMs) in the Coupled Model Intercomparison Project phase 5 (CMIP5) to higher 50 km spatial resolution over a large domain covering South Asia for two representation concentration pathways (RCP4.5 and RCP8.5) future scenarios. The analysis specifically examined and evaluated multi-model and multi-scenario climate change projections over the hilly sub-regions within HKH for the near-future (2036e2065) and far-future (2066e2095) periods. The downscaled multi-RCMs provide relatively better confidence than their driving AOGCMs in projecting the magnitude of seasonal warming for the hilly sub-region within the Karakoram and northwestern Himalaya, with higher projected change of 5.4
C during winter than of 4.9
C during summer monsoon season by the end of 21st century under the high-end emissions (RCP8.5) scenario. There is less agreement among these RCMs on the magnitude of the projected warming over the other sub-regions within HKH for both seasons, particularly associated with higher RCM uncertainty for the hilly sub-region within the central Himalaya. The downscaled multi-RCMs show good consensus and low RCM uncertainty in projecting that the summer monsoon precipitation will intensify by about 22% in the hilly subregion within the southeastern Himalaya and Tibetan Plateau for the far-future period under the RCP8.5 scenario. There is low confidence in the projected changes in the summer monsoon and winter season precipitation over the central Himalaya and in the Karakoram and northwestern Himalaya due to poor consensus and moderate to high RCM uncertainty among the downsca

摘要：ＣＡＮＤＵ 堆热工水力设计采用目前一些典型的分析方法， 并通过一些重要的实验研究计划对这些典型的分析方法进行强化支持。这些研究计划是为了发展和验证数学模型。主要针对ＣＡＮＤＵ 堆特有的热工水力学（ 燃料通道流动和压降、临界热流密度、热传输系统的喷放和再注水特性； 慢化剂系统中的流动和温度分布； 安全壳系统的热工水力学） 。本文介绍ＣＡＮＤＵ 堆设计所用的计算机模型， 以及为确认其结果而进行的一些实验和理论验证。

摘要：额定工作温度高达100℃的设计的出现,使业界对热稳定性和低驱动电流的需求飚升。光耦合器是具有绝缘安全性及在输入和输出之间实现电气信号隔离功能的器件。系统工作温度的提升对光耦合器在热耗上提出了更严格的要求。本文从封装技术和Ired材料方面分析了对这两点对光耦合器的热耗方面的贡献。

摘要：骑两轮车和进行某些体育活动时所佩戴的功能性头盔大都是为了满足个人需求而独立设计。佩戴者长时间佩戴头盔并进行激烈运动会产生大量的汗液,但由于头盔设计上的缺陷,汗液无法及时排出。而人们对于在头与头盔之间佩戴无边帽的意识还很落后,且对无边帽的材料和结构适用性缺乏研究。通过系统科学地研究,探索出了适用于无边帽的材料和织物结构,提高了佩戴舒适性。