58,412 research outputs found
Effect of GPa pressure on microstructures and heat transfer phenomena of aluminum alloys during solidification
No full text학위논문(박사) - 한국과학기술원 : 재료공학과, 1994.8, [ iv, 116 p. ]한국과학기술원 : 재료공학과
Do Bugs Propagate? An Empirical Analysis of Temporal Correlations Among Software Bugs
No full textThe occurrences of bugs are not isolated events, rather they may interact, affect each other, and trigger other latent bugs. Identifying and understanding bug correlations could help developers localize bug origins, predict potential bugs, and design better architectures of software artifacts to prevent bug affection. Many studies in the defect prediction and fault localization literature implied the dependence and interactions between multiple bugs, but few of them explicitly investigate the correlations of bugs across time steps and how bugs affect each other. In this paper, we perform social network analysis on the temporal correlations between bugs across time steps on software artifact ties, i.e., software graphs. Adopted from the correlation analysis methodology in social networks, we construct software graphs of three artifact ties such as function calls and type hierarchy and then perform longitudinal logistic regressions of time-lag bug correlations on these graphs. Our experiments on four open-source projects suggest that bugs can propagate as observed on certain artifact tie graphs. Based on our findings, we propose a hybrid artifact tie graph, a synthesis of a few well-known software graphs, that exhibits a higher degree of bug propagation. Our findings shed light on research for better bug prediction and localization models and help developers to perform maintenance actions to prevent consequential bugs
Simon’s Congruence Pattern Matching
No full textTesting Simon’s congruence asks whether two strings have the same set of subsequences of length no greater than a given integer. In the light of the recent discovery of an optimal linear algorithm for testing Simon’s congruence, we solve the Simon’s congruence pattern matching problem. The problem requires finding all substrings of a text that are congruent to a pattern under the Simon’s congruence. Our algorithm efficiently solves the problem in linear time in the length of the text by reusing results from previous computations with the help of new data structures called X-trees and Y-trees. Moreover, we define and solve variants of the Simon’s congruence pattern matching problem. They require finding the longest and shortest substring of the text as well as the shortest subsequence of the text which is congruent to the pattern under the Simon’s congruence. Two more variants which ask for the longest congruent subsequence of the text and optimizing the pattern matching problem are left as open problems
Kim Yo Han
No full text학위논문(석사)--아주대학교 정보통신대학원 :정보보호,2009. 2요 약 문
현 경계작전은 쌍안경, 야간감시경, 발성장애물 등 감시보조장비와 제한된 과학화 장비를 이용하여 실시되고 있으나, 대부분 인간의 오감에 의한 감시로 탐지의 신뢰성이 낮아 시·공간적 사각지역을 극복할 수 있는 대책이 필요하다. 따라서 본 연구에서는 RFID/USN 기술을 이용한 무인감시 시스템 구축 시 군사용으로 사용할 수 있도록 센서노드와 M/W, 보안 분야에 대한 요구사항을 도출하였다.차 례
제1장. 서 론 1
제2장. 국방 무인감시 시스템 3
2.1 고정형 시스템 4
2.2 이동형 시스템 6
2.3 센서노드의 유형별 특성 7
2.4 USN장비의 논리적 구조 9
2.4.1 센서노드 9
2.4.2 중계노드 11
2.4.3 고정형 싱크노드 12
2.4.4 이동형 싱크노드 14
제3장. 시스템 요구사항 분석 16
3.1 센서노드에 대한 요구사항 16
3.1.1 센서들의 오경보 최소화 16
3.1.2 센서노드의 위장 17
3.1.3 USN장비의 피탈 대응 18
3.1.4 주파수 잠식에 의한 센서장비들의 오작동 19
3.2 미들웨어(M/W)에 대한 요구사항 20
3.2.1 신뢰성 있는 상황도 도시 방안 20
3.2.2 장비 / 네트워크 운영 23
3.3 보안 요구사항 24
3.3.1 무인감시체계의 취약점 25
3.3.2 RFID / USN 공격 기법 27
3.3.3 무인감시체계 보안 목표 29
제4장. 결 론 32
참 고 문 헌 33Maste
Dataset to support the article "High Sensing Accuracy Realisation with Millimetre/sub-Millimetre Resolution in Optical Frequency Domain Reflectometer"
No full textThis dataset is used for realizing high sensing accuracy and sub-millimetre resolution of Optical Frequency Domain Reflectometer. It is associated with the research paper "High Sensing Accuracy Realisation with Millimetre sub-Millimetre Resolution in Optical Frequency Domain Reflectometer" in Journal: Journal of Lightwave Technology.
This work was funded by High Value Manufacturing Catapult, grant reference, 160080 CORE (WMG), titled ‘Smart Sensing for Future Batteries’ and the EPSRC (Engineering and Physical Sciences Research Council), grant reference EP/R004927/1, titled ‘Prosperity Partnership’. The author Gaoce Han would like to acknowledge the China Scholarship Council for sponsoring.</span
Ecological indicators for mercury biomonitoring using fish: Insights from compound-specific nitrogen and mercury stable isotopes
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