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Development of a High Performance Web-Server Scheme Including SSL/TLS Protocol
민병조 ( Byungjo Min ),황준 ( June Hwang ),김학배 ( Hagbae Kim ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
This paper proposes a high Performance Web-server scheme, which maximizes the efficiency of web services. The proposed architecture not only accelerate non-secure web services but also significantly increases the processing rate of Secure Socket Layer(SSL) operations on a web server, especially when the traffic is heavy. Because most web servers previously used apply user threads for processing HTTP/HTTPS requests, CPU overheads are inevitable. They end up slowing the processing time down. It is built in the Linux-based kernel as a kernel module to reduce the functional overheads of the user-level applications. To validate the effectiveness of proposed architecture, we evaluate its performance in comparison with the conventional Apache. As a result, it improves webserver performance by up to 500% for non-secure static contents and by up to 200% for SSL operations.
민병조,김학배 연세대학교 산업기술연구소 1998 논문집 Vol.30 No.1
A real-time system is characterized by its timing constraint which accounts for system inertia against temporal controller-failure(s) and depends intrinsically on the plant dynamics and the environments. In this paper, we do not only build a semi-Markov model to evaluate the probability of system failure for the system embedded with the deadline information but also propose a path-space approach to derive both upper and lower bounds of system reliability significantly reducing computing complexity without loss of much accuracy, which is verified by the tightness between both of the bounds derived in numerical examples.
Yoo, Yeong-Min,Lee, Myung-Han,Park, Ji Hyung,Seo, Dong-Hyun,Lee, Sangyeob,Jung, Byungjo,Kim, Han Sung,Bae, Kiho MDPI 2015 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.16 No.11
<P>Low-level laser therapy/treatment (LLLT) using a minimally invasive laser needle system (MILNS) might enhance bone formation and suppress bone resorption. In this study, the use of 405 nm LLLT led to decreases in bone volume and bone mineral density (BMD) of tibial trabecular bone in wild-type (WT) and <I>Per2</I> knockout (KO) mice. Bone volume and bone mineral density of tibial trabecular bone was decreased by 405 nm LLLT in <I>Per2</I> KO compared to WT mice at two and four weeks. To determine the reduction in tibial bone, mRNA expressions of alkaline phosphatase (<I>ALP)</I> and <I>Per2</I> were investigated at four weeks after 405 nm laser stimulation using MILNS. <I>ALP</I> gene expression was significantly reduced in the LLLT-stimulated right tibial bone of WT and <I>Per2</I> KO mice compared to the non-irradiated left tibia (<I>p</I> < 0.001). <I>Per2</I> mRNA expression in WT mice was significantly reduced in the LLLT-stimulated right tibial bone compared to the non-irradiated left tibia (<I>p</I> < 0.001). To identify the decrease in tibial bone mediated by the <I>Per2</I> gene, levels of runt-related transcription factor 2 (<I>Runx2</I>) and <I>ALP</I> mRNAs were determined in non-irradiated WT and <I>Per2</I> KO mice. These results demonstrated significant downregulation of <I>Runx2</I> and <I>ALP</I> mRNA levels in <I>Per2</I> KO mice (<I>p</I> < 0.001). Therefore, the reduction in tibial trabecular bone resulting from 405 nm LLLT using MILNS might be associated with <I>Per2</I> gene expression.</P>