Digital Library[ Search Result ]
Evaluation of Interest Point Detectors for Data Authentication in Wireless Multimedia Sensor Network (WMSN)
http://doi.org/10.5626/JOK.2019.46.2.184
In Wireless Multimedia Sensor Networks (WMSNs), authentication of multimedia data is very important because the data can be used in making crucial decisions. This study evaluates interest point detectors in terms of resilience to channel error occurred in WMSNs, robustness to JPEG compression, and sensitivity to image tampering. SIFT, SURF, ORB, AKAZE, SADDLE and HOG were evaluated with USC-SIPI image database by computing recall and precision between the original images and modified images by channel errors and JPEG compression and tampering. In addition, median filter and Gaussian filter were applied to reduce channel error and quantization errors from JPEG compression respectively and produced significant performance. AKAZE showed best performance for all conditions of experiments. The evaluation of interest point detectors showed the possibility of their application to authentication in WMSNs.
Design and Implementation of a Log-structured Buffer Based on Non-volatile Memory
http://doi.org/10.5626/JOK.2018.45.11.1117
Next-generation non-volatile memory (NVM) technologies, such as PCM and STTMRAM, provide low latency, high bandwidth, non-volatility, and high capacity. Such NVMs are widely used and studied in the field of computer systems and databases for high performance computing. For example, recent researchers have used NVM for journaling buffers and database logging of file systems and have conducted many optimization studies accordingly. As a complement to existing work, this paper focuses on the atomic page update of applications. For example, in a data management application such as a database system, the atomicity of the pages is ensured by performing a redundant write operation with a temporary buffer in order to atomically update multiple pages. However, this redundant write operation can reduce the performance. Therefore, in this paper, we introduce a log-structured buffer manager (LSMB) to improve the performance while ensuring the consistency. LSBM updates the page to NVM by logging and provides buffering. In addition, if there are duplicated pages in the buffer, the old version of the page is removed to reflect only the latest page, which minimizes the I/O and write amount. Experimental results show that LSBM improves the performance of the application and reduces the total write amount.
Search
Journal of KIISE
- ISSN : 2383-630X(Print)
- ISSN : 2383-6296(Electronic)
- KCI Accredited Journal
Editorial Office
- Tel. +82-2-588-9240
- Fax. +82-2-521-1352
- E-mail. chwoo@kiise.or.kr