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Probabilistic Soft Error Detection Based on Anomaly Speculation
유준혁 한국정보처리학회 2011 Journal of information processing systems Vol.7 No.3
Microprocessors are becoming increasingly vulnerable to soft errors due to the current trends of semiconductor technology scaling. Traditional redundant multi-threading architectures provide perfect fault tolerance by re-executing all the computations. However, such a full re-execution technique significantly increases the verification workload on the processor resources, resulting in severe performance degradation. This paper presents a pro-active verification management approach to mitigate the verification workload to increase its performance with a minimal effect on overall reliability. An anomaly-speculation-based filter checker is proposed to guide a verification priority before the re-execution process starts. This technique is accomplished by exploiting a value similarity property, which is defined by a frequent occurrence of partially identical values. Based on the biased distribution of similarity distance measure, this paper investigates further application to exploit similar values for soft error tolerance with anomaly speculation. Extensive measurements prove that the majority of instructions produce values, which are different from the previous result value, only in a few bits. Experimental results show that the proposed scheme accelerates the processor to be 180% faster than traditional fully-fault-tolerant processor with a minimal impact on overall soft error rate.
유준혁 대구대학교 정보통신연구소 2012 情報通信硏究 Vol.9 No.1
본 논문은 무선 네트워크 제어 시스템(Wireless Networked Control System)의 최신 연구동향을 제시한다. 일반적으로 유선 네트워크 제어 시스템(Networked Control System)에서 극복하지 못한 다양한 문제점들을 간단하게 해결할 수 있어, 무선 네트워크 기반의 제어 시스템을 선호하는 추세이며 이러한 많은 장점들이 있지만 개선해야할 문제점도 많다. 본 논문에서는 보완해야 할 다양한 문제점을 극복하기 위해 관련된 연구가 이루어지고 있는 동향을 제시한다.
유준혁,현창택,문현석,손명진,Yu, Jun-Hyeok,Hyun, Chang-Taek,Moon, Hyun-Seok,Son, Myung-Jin 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.1
정부는 상징성, 창의성, 예술성과 고난이도의 기술이 요구되는 건설사업에 대하여 건설업체들 간의 기술 경쟁을 촉진하기 위한 방안으로 2007년 9월부터 새로운 발주방식인 기술제안입찰제도를 도입하였다. 그러나 지금까지 발주 및 수행된 기술 제안입찰 사례를 살펴보면, 모두 300억 원 이상의 대형공사를 중심으로 적용되고 있는 실정이다. 왜냐하면 300억 미만인 중 소형 건설공사에 기술제안입찰을 적용하기에는 평가항목이 복잡하고 고도의 기술제안이 요구되며 과다한 제출서류와 중 소형 건설공사 특징을 반영하기 어렵기 때문이다. 따라서 본 연구에서는 대부분 대형 건설공사에 적용되고 있는 현행 기술제안입찰제도를 중 소형 건설공사에 적합한 기술제안입찰제도의 평가항목 및 평가요소, 배점에 대한 개선안을 제시하였다. 본 연구에서 제시한 기술제안서 평가기준은 기존 대형공사 위주로 진행되었던 기술제안입찰제도를 중 소형 건설공사에 적용하고자 하는데 의의가 있고, 중 소형 건설공사의 기술제안입찰 도입 및 정착에 기여할 것으로 기대된다. The government introduced the technical proposal drafting system in September 2007, as a new method to stimulate technical competence among construction companies to require ingenuity, creativity, artistic sense, and high-level technology. However, an examination of instances has shown that this system has been applied only to large scale constructions worth 30 billion won or more, and not to small and medium constructions worth less than 30 billion won. This is because the evaluation criteria of the system is structured in a manner that makes it difficult to apply to small and medium constructions. This study presented methods to improve the evaluation factors, categories, and scoring scheme of the technical proposal creation system for medium to small scale constructions to be able to further apply the current system to small and medium constructions. The technical proposal evaluation criteria presented in this study was significant in that it enabled the technical proposal creation system that was mainly used for large scale constructions to be further applied to medium to small scale constructions. And it also contributes to the establishment and settlement of a new technical proposal tendering for medium to small scale constructions.
Upregulation of Prostasin in Nasal Polyps
유준혁,이상학,이승훈,이흥만,박세진,김태훈 대한비과학회 2012 Journal of rhinology Vol.19 No.1
Objectives/Hypothesis : Prostasin is a protease that activates epithelial sodium channels (ENaC), which mediate Na+ absorption across epithelial surfaces. Human nasal polyps absorb more ENaC-mediated Na+ than normal mucosa. We investigated the expression and distribution of prostasin in normal mucosa and nasal polyp. Study Design : This was a controlled, prospective study. Methods: The distribution patterns and levels of expression of prostasin in normal sinus mucosa and nasal polyps were evaluated using real-time polymerase chain reaction (PCR), immunohistochemical staining and western blotting. Results : Real-time PCR revealed that the mRNA expression of prostasin was higher in nasal polyps than in normal sinus mucosa. The expression of prostasin was faint in immunohistochemical staining of superficial epithelial cells and submucosal glandular epithelial cells of normal sinus mucosa, but was intense in superficial epithelial cells and submucosal glandular epithelial cells in nasal polyps. Inflammatory cells infiltrating into the nasal mucosa also showed prostasin immunoreactivity in nasal polyps. Western blot analysis with prostasin antiserum detected prostasin protein in normal sinus mucosa and nasal polyps. The expression levels of prostasin were increased in nasal polyps compared with normal sinus mucosa. Conclusions : The levels of expression of prostasin were upregulated in nasal polyps compared to normal sinus mucosa, suggesting a role in the pathogenesis of nasal polyps. However, the exact pathophysiologic function of prostasin in nasal epithelium warrants further investigation.