• Journal of Institute of Control, Robotics and Systems
• /
• v.22 no.6
• /
• pp.424-428
• /
• 2016

A simple new sufficient condition for asymptotic stability of the positive linear time-varying discrete-time systems, with unstructured time-varying uncertainty in delayed states, is established in this paper Compared with previous results that cannot be applied to time-varying systems; the time-varying system and delay time are considered simultaneously in this paper. The proposed conditions are compared with suitable conditions for the typical discrete-time systems. The considerations are illustrated by numerical examples of previous work.

• Journal of Information Processing Systems
• /
• v.15 no.3
• /
• pp.550-569
• /
• 2019

We propose approaches for improving Bloom filter in terms of false positive probability and membership query speed. To reduce the false positive probability, we propose special type of additional Bloom filters that are used to handle false positives caused by the original Bloom filter. Implementing the proposed approach for a routing table lookup, we show that our approach reduces the routing table lookup time by up to 28% compared to the original Bloom filter by handling most false positives within the fast memory. We also introduce an approach for improving the membership query speed. Taking the hash table-like approach while storing only values, the proposed approach shows much faster membership query speed than the original Bloom filter (e.g., 34 times faster with 10 subsets). Even compared to a hash table, our approach reduces the routing table lookup time by up to 58%.

• Bulletin of the Korean Mathematical Society
• /
• v.60 no.5
• /
• pp.1181-1199
• /
• 2023

For solving complex symmetric positive definite linear systems, we propose a single step real-valued (SSR) iterative method, which does not involve the complex arithmetic. The upper bound on the spectral radius of the iteration matrix of the SSR method is given and its convergence properties are analyzed. In addition, the quasi-optimal parameter which minimizes the upper bound for the spectral radius of the proposed method is computed. Finally, numerical experiments are given to demonstrate the effectiveness and robustness of the propose methods.

• Communications of the Korean Mathematical Society
• /
• v.21 no.4
• /
• pp.701-717
• /
• 2006

The positive coexistence of a simple food chain model with ratio-dependent functional response and cross-diffusion is discussed. Especially, when a cross-diffusion is small enough, the existence of positive solutions of the system concerned can be expected. The extinction conditions for all three interacting species and for one or two of three species are studied. Moreover, when a cross-diffusion is sufficiently large, the extinction of prey species with cross-diffusion interaction to predator occurs. The method employed is the comparison argument for elliptic problem and fixed point theory in a positive cone on a Banach space.

• Management & Information Systems Review
• /
• v.25
• /
• pp.171-201
• /
• 2008

Previous research on negative contents of verbal message being more influential has a two broad streams as impression formation theory and negative information having an more diagnostic informational value. Therefore, this research was intended to obtain consistent results from researches by message frame segmentation of verbal message and to determine the medium of verbal message. It was proven from the research that objects influencing verbal message are being effected by the participation ratio of products and the positive indication is having more meaningful difference than the negative indication statistically unlike to the results of previous researches. Unlike just a biased positive message or negative message as the result of previous research, it was proven that the positive indication is influential regardless of sequences according to participation ratio and site participation in case of positive and negative being existing together.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.10a
• /
• pp.697-699
• /
• 2003

최근의 네트워크 공격의 주류는 DoS (denial-of-service)와 DDoS (distributed DoS) 공격이다. 이러한 공격들은 공격자가 침입 대상 시스템의 자원을 완전히 소모시켜서 시스템이 정상적인 서비스를 할 수 없도록 하는 것이다. 각 시스템의 관리자들은 이러한 침입이나 공격을 막기 위한 방편 중에 하나로 IDS(Intrusion detection system)를 사용하고 있다. 그러나 IDS의 높은 false-positive(정상적인 사용을 공격으로 잘못 판단하는 경우)의 발생빈도는 심각한 문제점 중의 하나는 이다. 이런 false-positive의 발생빈도를 줄이고자 본 논문에서는 한번의 판단만으로 연결(connection)을 차단시키지 않고, trust라는 개념을 도입하여 trust의 값에 따라서 사용자에게 차등 서비스를 제공하는 기법을 제안한다. 즉, trust를 이용하는 기법은 각 사용자를 한번에 공격자인지 일반 사용자인지 결정하지 않고, 한 번 더 검사하여 false-positive의 발생빈도를 감소시키는 기법이다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.10a
• /
• pp.307-309
• /
• 2004

침입탐지시스템에서 발생되는 오 경보는 false positive 와 false negative 로 구분된다. false positive는 실제적인 공격은 아니지만 공격이라고 오인하여 경보를 발생시켜 시스템의 효율성을 떨어뜨리기 때문에 false positive 패턴에 대한 분석이 필요하다. 오 경보 데이터는 시간이 지남에 따라 데이터의 양뿐만 아니라 데이터 패턴의 특성 또한 변하게 된다 따라서 새로운 데이터가 추가될 때마다 오 경보 데이터의 패턴을 분석할 수 있는 도구가 필요하다. 이 논문에서는 오 경보 데이터로부터 false positive 의 패턴을 분석할 수 있는 프레임워크에 대해서 기술한다. 우리의 프레임워크는 시간이 지남에 따라 변하는 데이터의 패턴 특성을 분석할 수 있도록 하기 위해 점진적 연관규칙 기법을 적용한다. 이 프레임워크를 통해서 false positive 패턴 특성의 변화를 효율적으로 관리 할 수 있다.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.40 no.2
• /
• pp.22-30
• /
• 2017

PL (Product Liability) refers to the legal responsibility of a manufacturer or seller for bodily injuries or property losses caused by product defects. Therefore, it is important for companies to construct a product liability response system that strategically manage and effectively adapt to product liability. A PL response system refers to companywide operations of PL prevention (PLP) measures, product safety (PS) measures, and PL defense (PLD) measures appropriate for a company's scale and environment. To establish an enterprise product liability response system, each essential component of corporations should be systematically operated and maintained considering the scale and characteristics of the corporations. Essential components of PL response system is Strategy, Organization, Training, Technology, Investment, and Awareness. Role of essential components is that companies need specific strategies to secure product safety and protect customers from product defects, and appropriate organizations must be composed for effective operation of such strategies. The objective of this paper seeks to examine the relationships among the essential components of the product liability response system and PL performance. PL performance consists of positive performance and negative performance. In particular, positive performance include increased efforts in product or process innovation such as strengthening research and development (R&D) to produce safer products without defects. In order to carry out this research we obtained 98 questionnaire of manufacturing company. A summary of the analyses is as follows: First, the awareness and technology among essential components affect significantly to the positive performance. Second, the awareness and strategy among essential components negative affect to the negative performance.

• Journal of Digital Contents Society
• /
• v.19 no.6
• /
• pp.1081-1090
• /
• 2018

The study has been derived through the empirical analysis so as to find the Continuous Usage of Electronic Official Document 24 System. Total of 236 questionnaires were analysis to users who used or experienced the Electronic Official Document 24 System. As a result of the analysis First Accuracy, Convenience, and Security have a positive(+) effect on Ease of Use. However, Compatibility and Innovation were not effect on Ease of Use Second, Accuracy, Convenience, Security, and Innovation have a positive(+) effect on Perceived Usefulness. However, Compatibility was not effect on Perceived Usefulness. Third, Behavioral Costs have a positive(+) effect Continuous Intention and perceived ease of use positively affects perceived usefulness and Continuous Intention. Finally, perceived usefulness also has a positive effect on the Continuous Intention.

• The Journal of Pediatrics of Korean Medicine
• /
• v.34 no.1
• /
• pp.37-47
• /
• 2020

Objectives After inducing dermatitis in 6-week-old mice, we tried to find out the effects of recovery in the damaged skin by administering genistein and palmitoylethanolamide (PEA) Methods The 6-week-old mice were divided into the control group (Ctrl), dermatitis causing group (AcDE), genistein-administered group after the onset of dermatitis (GsT), and PEA-administered group after the onset of dermatitis (PEAT). Seven mice were assigned to each group. Changes in the skin barrier were observed after three days of administration following the onset of dermatitis. Results In the GsT and PEAT, there was less skin damage compared to the AcDE, and the lowest skin damage showed in the GsT. The intensity of CB1 and CB2 expression was increased by 64% (CB1) and 39% (CB2) in the GsT, and 38% (CB1) and 28% (CB2) in the PEAT compared to the AcDE. The E-catherin positive reaction was decreased in the AcDE, while the E-catherin positive reaction was increased in the GsT (76%) and PEAT (34%). The p-JNK positive reaction was increased in the AcDE, while the p-JNK positive reaction was decreased in the GsT (60%) and PEAT (39%). Toxic Hepatopathy was not observed in the liver tissue of Genistein administered 3OGsT, and PEA administered 3OPEAT. Conclusions Genistein has recovery effect on dermatitis damage through active induction of the endocannabin system (ECS).