1,721,022 research outputs found
MULTI-PATTERN MATCHING ALGORITHM AND PROCESSING APPARATUS USING THEREOF
No full text실시 형태에 따른 다중 패턴 매칭 알고리즘은, 무빙 윈도우를 문자열의 처음부터 1바이트씩 이동시키는 이동단계; 상기 무빙 윈도우의 현재 위치에서 2바이트 길이만큼의 문자열을 정수 값으로 변환하여, 패턴의 길이가 2바이트 이상인 패턴들에 대한 제1 다이렉트 필터(DF1)에서의 관련 위치의 비트가 1로 세팅되어 있는지 확인하는 DF1확인단계; 상기 DF1확인단계에 따라 1로 세팅된 경우, 다른 다이렉트 필터(DF)로 이동하는 DF이동단계; 마지막으로 확인한 다이렉트 필터(DF)의 관련 위치의 비트가 0인 경우, 상기 무빙 윈도우를 다시 1바이트 이동시키는 재이동단계; 및 상기 무빙 윈도우가 상기 문자열의 끝에 위치하는지 확인하고, 상기 무빙 윈도우가 상기 문자열의 끝에 위치하는 경우, 알고리즘을 종료하는 종료단계;를 포함한다
Method for Detecting Intrusion Based on Attack Signature without Attack Pattern and Apparatus Therefor
No full text공격 패턴이 존재하지 않는 공격 시그니처 기반의 침입 탐지 방법 및 그를 위한 장치를 개시한다.공격 패턴이 존재하지 않는 복수의 시그니처에 근거하여 공격 탐지 트리를 생성하고, 공격 탐지 트리에 포함된 복수의 노드와 네트워크로부터 수신된 패킷을 비교하여 네트워크 침입 탐지를 수행하는 공격 패턴이 존재하지 않는 공격 시그니처 기반의 침입 탐지 방법 및 그를 위한 장치에 관한 것이다
Apparatus for Detecting Intrusion and Packet Processing Method Using Same
No full text본 실시예는 프로그램 가능한 네트워크 인터페이스를 이용하여 각 코어에서 수행되던 기능 중 일부 기능을 네트워크 인터페이스 내에 구현하는 한편, 네트워크 트래픽의 양에 따라 전체 플로우 중 일부 플로우를 호스트 머신의 프로세서로 오프로딩시킴으로써 기존 침입 탐지장치 대비 전력소모를 줄이고 패킷 프로세싱 오버헤드를 감소시켜 보다 효율적으로 패킷이 처리될 수 있도록 하는 복수의 코어를 구비한 침입 탐지장치 및 그를 이용한 패킷 처리방법에 관한 것이다
Kargus
No full textAs high-speed networks are becoming commonplace, it is increasingly challenging to prevent the attack attempts at the edge of the Intern et. While many high-performance intrusion detection systems (IDSes) employ dedicated network processors or special memory to meet the demanding performance requirements, it often increases the cost and limits functional flexibility. In contrast, existing softwarebased IDS stacks fail to achieve a high throughput despite modern hardware innovations such as multicore CPUs, manycore GPUs, and 10 Gbps network cards that support multiple hardware queues. We present Kargus, a highly-scalable software-based IDS that exploits the full potential of commodity computing hardware. First, Kargus batch processes incoming packets at network cards and achieves up to 40 Gbps input rate even for minimum-sized packets. Second, it exploits high processing parallelism by balancing the pattern matching workloads with multicore CPUs and heterogeneous GPUs, and benefits from extensive batch processing of multiple packets per each IDS function call. Third, Kargus adapts its resource usage depending on the input rate, significantly saving the power in a normal situation. Our evaluation shows that Kargus on a 12-core machine with two GPUs handles up to 33 Gbps of normal traffic and achieves 9 to 10 Gbps even when all packets contain attack signatures, a factor of 1.9 to 4.3 performance improvements over the existing state-of-the-art software IDS. We design Kargus to be compatible with the most popular software IDS, Snort
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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