基准面旋回原理在储层研究中的应用——以川中公山庙构造沙一油藏为例

以川中公山庙构造沙一油藏为例,以高分辨率层序地层学的基准面旋回原理为指导思想,在储层沉积学特征研究的基础上,从“沉积作用-基准面旋回-非均质性研究”的思路出发,较详细地分析了沙一油藏不同级次的基准面旋回的特点及其对储层宏观非均质性的控制.在沙一油藏滨浅湖-三角洲相沉积体系中共划出1个长期、6个中期和29个短期旋回层序.在此基础上指出沙一油藏储层宏观非均质性受控于基准面的旋回变化,一般在中期基准面旋回上升半旋回的下部砂体比较发育,非均质性弱;各中期基准面旋回上升半旋回末期和下降半旋回期泥质沉积较发育,非均质性强;同时探讨了基准面旋回原理在储层表征和油气田开发中的应用前景.     

无线传感器网络的自组织成簇算法

异构传感器网络是一种能量有限且分布不均衡的网络,负载均衡和能量有效是此网络路由算法的一个挑战。现提出的自组织成簇算法能够有效增加传感器网络的稳定周期,算法基于传感器节点的剩余能量和通讯能耗选择适合的簇头节点。与经典的成簇算法LEACH和SET比较,本算法能够更好实现负载均衡,并极大地提高传感器网络的稳定周期。     

Separable reversible data hiding in encrypted image based on pixel value ordering and additive homomorphism

This work proposes a separable reversible data hiding scheme in encrypted images based on pixel value ordering (PVO). After the original image is encrypted using homomorphism encryption by the content owner, the data hider embeds the secret data in encrypted domain. The PVO strategy realizes hiding data in each block. Additive homomorphism guarantees the performance of PVO in encrypted domain is close to that in plain domain. Besides, the homomorphism encryption does not cause data expansion, and the payload can be further improved. With the watermarked encrypted image, if the receiver has only the data hiding key, he can extract the additional data. If the receiver has only the encryption key, he can obtain a decrypted image similar to the original one. If the receiver has both the data hiding key and the encryption key, he can extract the additional data without any error and recover the original image losslessly.     

基于C8051F020控制的液晶显示屏设计

DMF-50840点阵图形液晶显示由大屏幕LCD液晶显示器、SED1335控制器、CCFL背光逆变器和DC-DC显示驱动电源组成.基于C8051F020单片机控制的液晶显示屏SED1335控制器,解译MPU发来的指令代码,将参数置入相应寄存器内,并触发相应逻辑电路运行.软件设计采用配置C8051F020单片机为无块选择的分片模式8位驱动.     

Anonymous crowdsourcing-based WLAN indoor localization

In order to solve the problem of location privacy under big data and improve the user positioning experience, a new concept of anonymous crowdsourcing-based WLAN indoor localization is proposed by employing the Micro-Electro-Mechanical System (MEMS) motion sensors as well as WLAN module in off-the-shelf smartphones. First of all, the crowdsourced motion traces with similar Received Signal Strength(RSS) sequences are assembled into a motion graph. Second, the mobility map is constructed according to traces segmentation and clustering. Third, the pixel template matching is adopted to physically label the pre-constructed mobility map. Finally, the robust Extended Kalman Filter (EKF) is designed to perform localization by matching the newly-collected RSS measurements against the mobility map. The extensive experimental results show that the proposed approach is capable of constructing a physically-labeled mobility map from the sporadically-collected crowdsourced motion traces as well as achieving satisfactory localization accuracy in a cost-efficient manner.     

It doesn’t take a village to fall for misinformation: Social media use,discussion heterogeneity preference,worry of the virus,faith in scientists,and COVID-19-related misinformation beliefs

With the circulation of misinformation about the COVID-19 pandemic, the World Health Organization has raised concerns about an “infodemic,” which exacerbates people’s misperceptions and deters preventive measures. Against this backdrop, this study examined the conditional indirect effect of social media use and discussion heterogeneity preference on COVID-19-related misinformation beliefs in the United States, using a national survey. Findings suggested that social media use was positively associated with misinformation beliefs, while discussion heterogeneity preference was negatively associated with misinformation beliefs. Furthermore, worry of COVID-19 was found to be a significant mediator as both associations became more significant when mediated through worry. In addition, faith in scientists served as a moderator that mitigated the indirect effect of discussion heterogeneity preference on misinformation beliefs. That is, among those who had stronger faiths in scientists, the indirect effect of discussion heterogeneity preference on misinformation belief became more negative. The findings revealed communication and psychological factors associated with COVID-19-related misinformation beliefs and provided insights into coping strategies during the pandemic.     

Suppression of viewing angle dependence of organic light emitting diodes by introduction of circular polarizer with nanoporous polymer film

To improve poor viewing angle characteristics of top emission organic light emitting diodes (TEOLEDs) without any serious pixel blur phenomena, we applied a circular polarizer (CP) film modified by nanoporous polymer film (NPF). From this approach, we could improve the color shift significantly (Δu'v’ in CIE 1976 with viewing angle, from 0.0165 to 0.0114), and expand angular light emission distribution of off-axis by applying CP with NPF. We found that black color shift was little associated with NPF position change although black color was slightly faded tint by applying NPF, as like plasma display panel(PDP)’s off condition. Very interestingly, we found that the reflectance was not changed seriously whether NPF exists between glass encapsulation and CP or not. Besides, we investigated the pixel blur level when we applied different condition in encapsulation thickness and morphology of diffusing films. As a result, we found that the pixel blur phenomena can be significantly suppressed by applying thin encapsulation and NPF type diffuser film.     

一种基于变化检测技术的SAR图像舰船目标鉴别方法

该文引入变化检测思想,利用SAR图像中海杂波和目标之间的灰度差异,通过对潜在舰船目标切片的目标像素和背景像素进行分离,计算目标像素聚集度(TPAM)特征,实现对高亮像素在图像切片中聚集程度的定量评估,从而鉴别目标切片中是否包含有舰船目标,有效去除杂波虚警。首先,基于感兴趣区域(ROI)切片中心为目标像素及四周为海杂波的合理假设,构建似然比变化检测量获取差异图像;然后,利用KSW熵阈值选择方法实现差异图像中目标像素和海杂波像素的自动分离,生成二值图像;最后,利用切片中心像素为种子点,对二值图像进行区域生长,计算目标像素聚集度特征,并判断目标切片是否包含舰船目标。基于RADARSAT-1 SAR实测数据的实验结果表明,该文方法得到的目标像素聚集度特征计算简单、稳健性好、可区分度高,具有良好的鉴别性能,能够去除大部分海杂波干扰产生的虚警,有效地降低目标检测虚警率。     

企业信息系统中高级发布/订阅层的实现

基于消息的企业应用程序之间的交互越加受到关注，它主要使用发布，订阅机制实现数据（消息）的交换。但是大多数的发布，订阅通知服务均假定在同一命名空间，不支持异构空间的应用之间的数据交换。首先简要描述了用于消息的分布式异构应用程序之间的作为高层发布机制基于概念的方法，然后讨论了设计和应用该发布机制的相关问题，以及如何将该机制集成于J2EE平台的方法。