Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着数字广播电视技术的不断创新发展,数字电视已经完成了由标清到4k技术的过渡。新一代4k技术电视想要实现播放实践一体化,必须依托互联网对播放实践系进行优化改进。本文就4k技术电视播放实践一体化的设计与实现进行分析研究。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2022-09-26 Cooperative journals: 《干旱区研究》
Abstract：土壤水分特征曲线是土壤的重要水分运动参数之一，受土壤质地、容重、结构、温度等影响。为探明初始 容重对土壤水分特征曲线及相应水分运动参数的影响，选取3种类型土壤，分别设置5个初始容重处理，利用van Genuchten模型拟合获取土壤水分特征曲线及其水分运动参数，分析初始容重对不同类型土壤水分特征曲线及相 应水分运动参数的影响。结果表明：（1）近饱和段（SS>100 kPa），黑土的水分特征曲面随 着初始容重的增加平缓上升，红壤的水分特征曲面在初始容重由1.3 cm3cm-3 增加到1.4 cm3cm-3 的过程中呈下降 趋势，塿土的水分特征曲面在初始容重由1.3 cm3cm-3 增加到1.4 cm3cm-3 时上升的更加陡直。（2）van Genuchten模 型对土壤水分特征曲线拟合效果较好（R2>0.99），适用于这3种类型土壤不同初始容重条件下的水分特征曲线的拟 合。（3）3种土壤的水分运动参数、s与初始容重均表现为显著的负相关关系（P在不 同初始容重间差异显著（Pr与初始容重表现为显著的负相关关系（Pn表现为显著的正相关关系（Pn呈负相关关系，但关系不显著（P>0.01），且3种土壤不同初始容重处理间水分运动参数n的变化幅度 较小，变化幅度维持在0.1左右。研究结果可为不同类型土壤、不同初始容重条件下土壤水分运动参数的获取及水 文过程模拟提供参考。
Subjects: Geosciences >> Geography submitted time 2021-04-23 Cooperative journals: 《干旱区研究》
Abstract：以内蒙古荒漠区短脚锦鸡儿灌木为研究对象，采用野外调查法分析灌丛对植物群落的影响，采用传统培养法，结合分子鉴定法分析灌丛对土壤微生物群落的影响。结果表明：（1）灌丛内植物群落多度和总生物量显著大于灌丛外，但是物种丰度和Shannon-Wiener指数灌丛内外无显著差异；（2）随土壤深度的增加，表层土与深层土的土壤可培养细菌丰度和真菌多度差异不显著，其余土壤微生物群落多样性特征均表现为：表层土显著大于深层土；（3）灌丛对土壤微生物群落具有正效应，且表层土正效应最大；（4）灌丛对植物群落的促进作用大于对土壤微生物群落的作用。
Subjects: Library Science，Information Science >> Library Science submitted time 2023-08-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] This paper aims to explore user roles and behaviors in the learning groups' online knowledge collaboration and their collaborative features and distributions. This study will help people better understand behavioral features and distributions of collaborative user roles in the learning groups' collaboration. It will also help information service providers to provide more useful information to different users.[Method/process] By the methods of social network analysis (SNA) and cluster analysis, we collected 1096 collaborative log edits from an online course collaboration platform and analyzed them. [Result/conclusion] In learning groups' online knowledge collaboration, leaders play a significant leading role,substantial content providers focus on providing contentand have little communications with other users despite some micro-collaboration among themselves. Maintainer corrects the editing vulnerabilities and misbehavior of other roles in the collaboration, and also maintain close relationships with key users in the group. The contribution of social connectors is not quite obvious in learning groups.
Subjects: Library Science，Information Science >> Information Science submitted time 2022-11-27 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/Significance] The purpose of this study is to investigate the influence of prior attitudes onusers’access to opposing information , especially the behavioral characteristics of selective exposure , selective under-standing, and selective recall. ( Method/Process] This study adopted the experimental method. Firstly, the prioraltitudes of the participants were understood through the pre-test questionnaire , and then the participants were provid.ed with articles of the same and opposite viewpoints. The participants freely chose the articles to read and thought aoud, and made decisions again after reading and displayed the reasons. After the experiment, the participants filleoin the post-est questionnare. [Result/Conclusion] Participants have selective exposure and selective recall, andprior attitude have a significant effect on selective exposure behaviors and recall after 1 day. On the basis of selectiveexposure , participants show four cognitive and understanding processes for information. There are 11 cognitive mechanisms , including " key item extraction" , " restatement , " semantic fit" and " eliminalion". In the theorelicasense , this study supplements the research results related to selective information behaviors and enriches the researchin the field of the information behavior. From the point of view of practical significance, it helps to promote usersmore objective cognition and scientific decision-making.
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] Social tagging is used widely used in organizing user generated web contents. However, relatively less is known about the new motivations behind social tagging of user generated video contents. This paper analyzes Bilibili.com’s video tags to explore the new entertainment trend in video tagging. [Method/process] It used a mixed-method approach by content analysis and interviews to understand the use of video tags to study the tag content, motivations and functions of the entertaining tags. [Result/conclusion] ①The most common types of video tags used by users are "content theme" and "people". ②Entertainment tags are an important part of the content of B-station tags. ③ The motivation of users to use entertainment tags is mostly for social communication and interaction. ④Entertainment tags have special functions in addition to traditional tags, such as "improving video viewing experience". This study provides some preliminary results on the tagging of ACG videos and insights to further understand the new trends of video indexing and social tagging.
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/Significance] From the perspective of knowledge organization, this study explores the influence of two different organization forms on the reading effect of learning materials, and provides references for the research and application of knowledge representation in subsequent reading materials. [Method/Process] Using a between-group experiment design, 26 subjects participated two types of reading tests, a reading search task and a memory task, respectively. The differences were compared by reading time, the number of correct questions and subjective preference of subjects. [Result/Conclusion] The results show that there is no significant difference in the performance of the subjects in the search task, but in the memory task, the reading effect of tree-structure organization form is significantly better than traditional linear paragraphs. In addition, the merits of the tree-structured materials in the evaluation of subjects’ subjective preferences are more, such as clear logic, easy to remember, and so on.
Subjects: Computer Science >> Information Security submitted time 2017-03-10
Abstract：随着信息技术的飞速发展，信息安全问题越来越得到全社会的重视。其中网络内容安全是最突出的问题之一，而作为网络内容安全处理核心技术的网络数据流过滤技术也面临着新的挑战。本文从网络数据流过滤问题出发，研究利用多通道信息进行网络数据流分类的技术，包括以下三方面的工作：（1）多通道 网络流分类模型研究，提出了可融合网络结构信息和网络内容信息的流分类模型；（2）分类模型索引技术 研究，提出一种基于 R-Tree 分类模型索引结构，极大地提高了网络数据流的判别速度；（3）多通道网络流 过滤系统 F9 实验平台建设，该系统支持多通道网络流判别过滤，可作为新模型与算法的实验平台。以上三 方面的工作从模型构造，模型索引，和模型实现三方面系统研究了面向信息过滤的多通道网络流分类系统。
Peer Review Status:
Awaiting Review
Subjects: Library Science，Information Science >> Library Science submitted time 2023-08-27 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] This study aims to explore the differences between collaborative mode and individual mode of information search on search experience and search interaction, trying to understand the characteristics of collaborative information search from various angles.[Method/process] The experiment is designed based on books interactive retrieval platform (CLEF-Social Book Search). Sixteen independent and eighteen collaborative participants are recruited to the laboratory to complete different types of book search tasks. Users' interactions with the system during search are recorded through the backend server; while their search experience is recorded by questionnaires completed before and after the search. In data analysis, users' interactions and search experience are compared between two search modes.[Result/conclusion] (1) Search experience:Compared with individual searchers, collaborative searchers have better evaluation on experiment system function and higher evaluation on aesthetics, durability, novelty of the system, and participate in the search more intently. However, collaborative searcher felt a bit more frustrated and mentally taxing than individual searchers. (2) Search strategies:Compared with individual searchers, collaborative searchers make more decisions in the goal-oriented task, especially the decision of removing books from bookbag, which indicates collaborative searchers need to sort the books in the later stage. In the open-ended task, collaborative searchers spend more time before each decision than individual searchers, which is probably because of collaborative searcher's higher level of focus and participatory. This study helps understand about collaborative search through comparison with individual search, which may provide inspiration for collaborative search system design.
Subjects: Library Science，Information Science >> Information Science submitted time 2017-10-11 Cooperative journals: 《数据分析与知识发现》
Abstract： [Objective] This research aims to identify shopping tasks from product search, and then analyze the characteristic of multi-task sessions. [Methods] Using the product classification of Taobao, and a list of manually selected product terms, we identified online shopping tasks based on query terms from 19 704 search sessions by 2 754 users. [Results] First, factors influence the number of queries per shopping task: product characteristics, the amount of available products, and the difficulty in describing product category with query terms. Second, we found that in sessions with a major task, the relationship among the shopping tasks is closer. [Limitations] The task identification method based on query terms cannot completely describe the complex consumer shopping behaviors. [Conclusions] This study provides an exploratory understanding of the relationships among various shopping tasks, and may be used to improve product recommendation algorithm, as well as predict shopping behaviors.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Flower-like nanostructured SnS2 was synthesized by polyethylene glycol octylphenol ether (Triton X-100)-assisted hydrothermal method, the effect of the amount of surfactant Triton X-100 on the ingredient, morphology and electrochemical properties of the synthesized product was studied. Results show that the product is single- phase SnS2 with crystal structure of hexagonal CdI2. The Triton X-100 plays a dominative role in controlling the morphology of SnS2. With a dosage of 0.5 mL Triton X-100 the synthesized SnS2 possesses the highest degree of crystallinity with a fully flower-like morphology . A rechargeable Li-ion batteries with the as-prepared flowerlike nanostructured SnS2 as anode exhibits excellent electrochemical performance with high initial discharge specific capacity 1598 mAh穏- 1 and reversible capacity 656 mAh穏-1 respectively, in a voltage range of 0.01-1.2 V and a rate of 0.15C. After 50 cycles with a rate of 0.15C, the specific capacities retain 572 mAh穏-1 and capacity retention rate can reach 87.2%.
Subjects: Library Science，Information Science >> Information Science submitted time 2017-10-11 Cooperative journals: 《数据分析与知识发现》
Abstract： [Objective] This research aims to examine the information seeking behavior patterns and contextual factors of online shoppers’ multi-sessional activities. [Methods] First, we analyzed 1,409,160 logs of an online shopping Web site (generated by 4,285 users) to discover their information seeking behaviors. Second, we used in-depth interviews to explore the users’ motivations. [Results] We found that multi-session shoppers were more likely to check detailed introduction to the products than simply browsing. The average interval between each session was 3 to 4 days. Personal preferences, needs, financial ability and time might lead the users to restore their previous sessions. Searching, shopping carts, bookmarks, browsing and personalized recommendation services were the major channels for users to restore previous sessions. [Limitations] Because of the limited number of participants, results from the interviews might not be generalizable to the whole population. [Conclusions] This research helps us understand the complex online shopping behaviors as well as improve services and user experience of E-commence Web sites.
Subjects: Nursing >> Nursing submitted time 2023-04-24
Abstract：目的：探究在阴虚火旺型高血压患者治疗中实施耳穴贴压技术的效果。方法：本研究共纳入研究对象100例，均选自于我院确诊并进行治疗的阴虚火旺型高血压患者，病历资料选取时间为2022年1月至2022年12月。患者入组后由专人进行资料核实确保无缺失，以保证回顾分析准确性。根据病历号单双数分组，对照和观察两组纳入对象均为50例，在常规西医降压治疗同时为对照组采取基础护理支持，观察组则予以耳穴贴压技术，在不同护理模式下，比较两组患者护理效果、血压水平及护理安全性。 结果：在护理有效率比较上两组患者间存在较大差异，相比较对照组而言，观察组有效率更高（P＜0.05）；在血压水平比较上不同组别间有显著差异存在，与对照组相比较来说护理前差异较小（P＞0.05）观察组护理后血压较低且控制在正常范围（P＜0.05）；在不良反应比较上两组患者间差异较大，相比较对照组来说，观察组发生率更低（P＜0.05）。结论：耳穴贴压技术在阴虚火旺型高血压患者中应用效果明确，能够显著降低血压水平，减少不良反应发生，有推荐价值。
Peer Review Status:Awaiting Review
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/Significance] To help in-depth understanding of the influence of team member intimacy and collaboration tendencies on small-scale online knowledge collaboration behaviors, as well as the behavior mode of small-scale users online knowledge collaboration. The research results can be applied to the fields of online education, scientific research collaboration, and etc., to provide references for the improvement of online knowledge collaboration tools and platform functions. [Method/Process] Through user experiments, this paper analyzed the five types of behaviors of task planning, information retrieval, information sharing, information use and communication of small teams, and explored the influence of team members on the above behaviors. [Result/Conclusion] Intimacy has a positive and significant impact on strategy formulation, especially the collaborative strategy formulation behavior. Groups with high intimacy and weak collaboration are more inclined to make time plans. Groups with high intimacy and strong collaboration tend to share search strategies, especially the search experience. In the same situation of weak collaboration, the frequency of communication behaviors of the group with high intimacy is higher than that of the group with low intimacy, and the "double high" group has explored new ways of communication on its own. Collaboration tendencies have a significant impact on personal information retrieval behaviors. In the case of low intimacy, groups with weak collaboration tendencies conduct personal information retrieval more frequently. In the case of high intimacy, teams with strong collaboration tendencies share information and edit team results more frequently.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：图片已经成为连接媒体、品牌以及消费者的最高效的传播媒介之一。图片特征描述是图片检索、推荐和交换的重要基础。基于当前图片应用和图片元数据标准的现状分析,文章提出了着重描述图片内容和语义特征的图片内容元数据体系框架,并以此为基础完成了国家标准《中文新闻图片内容描述元数据规范》的编制,填补了国内图片元数据标准的空白,有助于提高图片标注效率和质量,更好地满足图片获取和交易交换的需要。
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2023-01-30 Cooperative journals: 《中国全科医学》
Abstract：
Background Hyperuricemia (HUA) caused by elevated serum uric acid (SUA) has been proven to be an independent risk factor for the development and progression of chronic kidney disease (CKD). However, there are few cohort studies on the correlation between SUA level and the development and progression of CKD in the Chinese elderly. Objective To investigate the association between baseline SUA level, changes in SUA levels, the risk of chronic kidney disease (CKD), and estimated glomerular filtration rate (eGFR) in the elderly in longevity areas in China. Methods Based on Healthy Aging and Biomarkers Cohort Study (HABCS), a sub cohort of the Chinese Longitudinal Healthy Longevity Survey (CLHLS), the elderly who underwent physical examination and provided biomedical indicators from 2012 to 2014 were selected as the study subjects. The age, gender, height, weight, waist circumference, calf circumference, blood pressure, blood lipid, blood glucose, blood routine examination, urine routine examination, and other medical indicators were collected at baseline and follow-up period. Cox proportional hazards regression model was used to analyze the association between different SUA levels and the risk of CKD. Pearson linear correlation and linear regression were used to analyze the association between changes in SUA level and changes in eGFR in the elderly. Results A total of 981 subjects were included in the study, with an average age of 80.1±11.9 years. The prevalence of HUA was 6.83%. The cumulative follow-up of 2029 person-years (median 2.05 years) showed 179 new cases of CKD, the cumulative incidence rate of CKD during the follow-up was 18.25% (95%CI: 15.88-20.81%), and the incidence density was 88.22/1000 person-years (95%CI: 76.24-101.41 person-years). After multivariate adjustment, compared with the lowest quartile group of baseline SUA level (Q1: < 223 μmol/L), the HR values of CKD risk in other three high quartile groups (Q2: 223-270 μmol/L, Q3: 271-326 μmol/L, and Q4 ≥ 326 μmol/L) were 1.19 (95%CI: 0.74, 1.94; P=0.474)，1.27 (95%CI: 0.76, 2.10; P=0.362), and 2.08 (95%CI: 1.27, 3.41; P=0.004; Ptrend=0.003), respectively. And a per 10 μmol/L increase in baseline SUA level, the risk of CKD increased by 4% (95%CI: 2%, 7%; P<0.001). The risk of CKD in the elderly with HUA at baseline was 2.00 times (95%CI: 1.20, 3.24; P=0.007) higher than that in the elderly without HUA. The results of Pearson linear correlation analysis showed that changes in eGFR in the elderly (r = -0.355, P<0.001) decreased with the increase of change in SUA level. Multivariate adjusted linear regression analysis result showed that for per 10 μmol/L increase change in SUA level, change in eGFR decreased by 1.03 (95%CI: -1.23, -0.83; P<0.001) ml/min/1.73m2. Conclusion Elevated SUA level are associated with an increased risk of CKD and a decline in eGFR in an elderly Chinese population.
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2023-01-03 Cooperative journals: 《中国全科医学》
Abstract：
Background The chronic kidney disease (CKD) seriously harms the health and the life span of the elderly. Hypertension is closely related to CKD. However, there are few cohort studies focusing on the blood pressure levels and CKD in the older adults. Objective To investigate the relationship between blood pressure and the risk of chronic kidney disease in the elderly aged 65 years and older. Methods Based on the "Chinese Longitudinal Healthy Longevity Survey (CLHLS)", 989 elderly people who underwent physical examination and biomedical indicator tests in 2012 were selected as subjects. Biomedical indicators including age, sex, height, weight, blood pressure, blood lipid, blood glucose and urine test were collected at baseline. The follow-up monitoring was conducted in 2014. Cox proportional hazard model was used to analyze the association between different blood pressure levels and the risk of CKD. Results 989 subjects, with an average age of 80.2±12.0 years, were included in the study. A total of 183 cases of CKD were diagnosed during an average follow-up time of 2.07 years. The cumulative incidence of CKD during the follow-up period was 18.5% (95%CI: 16.1%-21.1%), and the incidence density was 89.4/1000 person-years. Compared with normal blood pressure, older adults with hypertension, after adjusting for multiple factors, had a higher risk of CKD [HR (95%CI) 2.28 (1.13-4.60)]. The risk of CKD in older adults with baseline SBP ≥ 140mmHg was 1.83 times higher than that in older adults with SBP<120mmHg (95%CI: 1.02-3.29). The risk of CKD with baseline DBP ≥ 90mmHg was 1.55 times higher than those with DBP<80mmHg (95%CI: 1.02-2.35). Conclusion Elevated blood pressure is an independent risk factor for chronic kidney disease in the elderly. To increase screening and prevention of CKD is particularly important, especially for those with elevated systolic blood pressure.
Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract：介绍了聚焦太阳能热发电中熔融盐应用概况和腐蚀问题，综述了熔融硝酸盐、碳酸盐、氯盐、氟盐、氢氧化物等几种太阳能热发电传热储热候选熔盐腐蚀研究现状与进展，讨论了太阳能领域熔盐腐蚀研究存在的主要问题及进一步的研究方向。
Subjects: Geosciences >> Geography submitted time 2020-01-06 Cooperative journals: 《干旱区地理》
Abstract：研究遗址和地形等环境要素的关系有助于理解人地关系的作用机制。基于GIS空间分析和二元逻辑斯蒂模型分析了兰州盆地新石器时期马家窑和齐家文化遗址空间分布的特征、变化规律及影响因素，定量研究了地形等环境要素与遗址分布的关系。结果表明：新石器时期的马家窑文化、半山文化、马厂文化和齐家文化遗址均沿黄河分布，主要集中于河流阶地上坡度较小的区域。距河流的水平最近距离为318.6~17 721.7 m。新石器遗址特别是马厂遗址的空间集聚性明显。从马家窑类型、半山类型，发展到马厂类型，单一型遗址的占比逐渐由53.3%增多至92.6%。马厂类型的分布中心距离黄河最近。地形等环境要素显著影响遗址的空间分布，遗址出现概率主要受坡度、坡向和距黄河最近距离的影响，模型的解释程度可达65.0%。引入历史时期和现代聚落进行比较，历史时期聚落分布受到高程和坡度的影响，而现代聚落的分布主要受到高程、坡度和距河流距离的影响。聚落分布和影响因素的演变可能受到社会生产力发展的影响。
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