• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.44 no.3 s.357
• /
• pp.33-40
• /
• 2007

In this paper, low-rate TCP attack as one of shrew attacks is considered and the scaling based dynamic time warping (S-DTW) algorithm is introduced. The low-rate TCP attack can not be detected by the detection method for the previous flooding DoS/DDoS (Denial of Service/Distirbuted Denial of Service) attacks due to its low average traffic rate. It, however, is a periodic short burst that exploits the homogeneity of the minimum retransmission timeout (RTO) of TCP flows and then some pattern matching mechanisms have been proposed to detect it among legitimate input flows. A DTW mechanism as one of detection approaches has proposed to detect attack input stream consisting of many legitimate or attack flows, and shown a depending method as well. This approach, however, has a problem that legitimate input stream may be caught as an attack one. In addition, it is difficult to decide a threshold for separation between the legitimate and the malicious. Thus, the causes of this problem are analyzed through simulation and the scaling by maximum auto-correlation value is executed before computing the DTW. We also discuss the results on applying various scaling approaches and using standard deviation of input streams monitored.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2002.12a
• /
• pp.254-257
• /
• 2002

인터넷 보급의 확산과 전자상거래의 활성화와 유.무선 인터넷의 보급에 따른 악의적인 사이버 공격의 시도의 성공사례가 증가하고 있다. 미로 인해 점차 더 많은 문제가 야기될 것으로 예상된다. 현재 일반적인 인터넷상의 시스템은 악의적인 공격에 적절하게 대응해오지 못하고 있으며, 다른 범용의 시스템들도 기존의 백신 프로그램에 의존하며 그 공격에 대응해오고 있다. 따라서 새로운 침입에 대하여는 대처하기 힘든 단점을 가지고 있다. 본 논문에서는 생체 자율분산시스템의 일부분인 T세포의 positive selection과 negative selection을 이용한 자기/비자기 인식 알고리즘을 제안한다. 제안한 알고리즘은 네트워크 환경에서 침입탐지 시스템에 적용하여 기존에 알려진 침입뿐만 아니라 새로운 침입에 대해서도 대처할 수 있다

• Journal of Internet Computing and Services
• /
• v.17 no.2
• /
• pp.19-28
• /
• 2016

Internet traffic has been significantly increasing due to the development of information and communication networks and the growing numbers of cell phone users that access networks. This paper connects to this issue by presenting a way to detect and analyze a typical DDoS attack that results in Internet breaches and network attacks, which are on the increase. To achieve this goal, we improve features and GUI of the existing ATMSim analysis package and use it. This package operates on a network flow-based analysis method, which means that normal traffic collected through an internal LAN at the Korean Bible University campus as well as anomaly traffic with DDoS attacks are generated. Self-similarity processes are used to analyze normal and anomaly traffic that are collected and generated from the improved ATMSim. Our numerical results obtained from three Hurst parameter estimate techniques show that there is quantitatively a significant difference between normal traffic and anomaly traffic from a self-similarity perspective.

• Korean Journal of Social Welfare Studies
• /
• v.47 no.1
• /
• pp.151-178
• /
• 2016

The primary goal of the current study was to investigate the longitudinal relationship between household income, main caregiver depression, and youth aggression from the interactionist perspective. The data were derived by combining the 2006, 2009 and 2012 survey waves from the Korean Welfare Panel Study. This data set covered the full span of adolescence from elementary to high school. The study utilized 561 families as the final sample and conducted autoregressive cross-lagged analysis. As a result, the early income status, main caregiver depression and youth aggression were likely maintained over time. Second, the results provided support for a reciprocal relationship between income and main caregiver depression. On the other hand, the reciprocal relationship between main caregiver depression and youth aggression was not found in the current study. Finally, the mediating effect of main caregiver depression between income and youth aggression was not found in the present study. In conclusion, the results of this study support the interactionist model in that the association between family income and main caregiver depression involves reciprocity and mutual influence across time. These findings have major implications for policy and interventions in regards to low-income families.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
• /
• v.14 no.1
• /
• pp.53-63
• /
• 2003

The autistic disorder is identified as an independent clinical entity, since the first description of Leo Kanner. The etiologies of the autistic disorder are almost unclear and the autistic disorder has several abnormalities in aspect of morphology and function of brain. Self-mutilation is observed in the low functioning autistic patients, and early treatment for self mutilation are needed in order not to be chronic. This article reviewed the drugs for the several symptoms of the autistic disorder, especially for self-mutilation. The serotonin reuptake inhibitors does not have clear primary anti-aggressive effects. The dopamine blockers have considerable effects in order to decrease aggression and self injury, and the risperidone is most recommended because of side effects of conventional drugs. The naltrextone does not have consistent study results yet. The clonidine has aggression-decreasing effect. Also lithium is effective on the treatment for aggressive and self-injurious behaviors. And the anticonvulsants including carbamazepine are effective on aggressive explosive behaviors. In the future the pharmacotherapy for self-mutilation will be advanced through stalbe diagnosis and measurement of treatment response.

• Investigative Magnetic Resonance Imaging
• /
• v.12 no.2
• /
• pp.206-210
• /
• 2008

Aggressive angiomyxoma is a rare tumor that predominantly occurs in the female genital tract. Because of its high tendency for local recurrence, preoperative diagnosis is important to ensure wide excision and reduce recurrence risk. But it is often misdiagnosed due to its rarity. We present two cases of aggressive angiomyxoma: a recurrent case that was initially misdiagnosed and a preoperatively diagnosed case.

• Journal of Korean Home Economics Education Association
• /
• v.25 no.1
• /
• pp.137-153
• /
• 2013

The purpose of this study was to research the influence of experienced school violence as a victim on the coping behavior of adolescents and to investigate moderating effects of self regulatory ability which are the desirable coping behaviors as protection factor for adolescents who experienced as victim by school violence. The subjects of this study were 319 students from year 1 to year 3 of total 6 middle schools who experienced school violence as a victim in Daegu and the research tool is questionnaires which are consist of general characteristics of the subjects, experience of school violence scale, self regulatory ability scale, family healthy scale and coping behavior scale. In order to analyze the data of the study, factor analysis, relational regression, linear regression analysis and moderated multiple regressions were used. The main results of this study were as following. First, there was significant correlation between the adolescents who experienced school violence, self regulatory ability and the coping behaviors. Second, adolescents who experienced school violence as victim act more aggressive coping behavior than other coping behavior. Third, while experience of school violence as victim influence adolescents' coping behaviors, it was found that self regulatory ability affect role in the regulation. cognitive self regulatory ability are in charge of controlling the aggressive coping behaviors.

• Korean Journal of Childcare and Education
• /
• v.10 no.1
• /
• pp.27-42
• /
• 2014

The primary purpose of this study was to examine the influence of mothers' emotion expressiveness and children's attributional biases on children's aggressive behavior, focusing on gender differences. The data were collected from a total of 86 children; 46 6-year-old boys and 40 6-year-old girls in kindergartens, and their mothers in Seoul. The emotion expressiveness of the mothers were measured by a self-reported Korean version of SEFQ(Self Expressivness Family Questionnaire). Attributional biases of the children were evaluated by using Dodge and Frame's Story-Based Interview Scale. Children's aggressive behavior were measured by teachers using a children's Aggressive Behavior Scale developed by Crick(1995). T-test, correlation analysis, and multiple regression were used to analyze the collected data. The results showed that the relational attributional biases of children positively influenced overt/relational aggressive behaviors. The emotion expressiveness of mothers and the aggressive behavior of children, however, were not significant. Regarding gender differences in children, the negative emotion expressiveness of mothers predicted the girl's relational aggressive behavior negatively. Implications and limitations of this study were discussed.

• Journal of Digital Convergence
• /
• v.14 no.7
• /
• pp.485-496
• /
• 2016

The purpose of this study was to investigate relationships between the appraisal type of competency and aggression in elementary school students. Appraisal type was divided into inflated/deflated ratings. Appraisal type in competencies, and sex were independent variables, and aggression was dependent variables. SPPC, TRS and AS were administered to 419 students and 20 teachers. The major findings of this study were as follows: First, the correlation of child-teacher with perceived competence ratings was the highest in the scholastic competence. Second, frequency of deflated appraisal was the highest in the behavioral conduct. Third, physical aggression is differentiated by the sex. And physical aggression was high when athletic competence was deflated. Fourth, physical aggression, hostility and anger were high when physical appearance was deflated. Fifth, hostility is significantly different by the interaction effect between sex and appraisal type of behavioral conduct. The above findings imply that appraisal type in competencies does not always result in aggression and this study will provide a useful insight for aggression reduction in elementary school students.

• Journal of Families and Better Life
• /
• v.28 no.3
• /
• pp.73-80
• /
• 2010

This study investigates the relationships between aggression and rejection/neglect by mothers, child temperament, day care experience for preschoolers; in addition, the moderating effect of self-regulation was investigated. The subjects were 338 preschool children. Teachers completed questionnaires that assessed aggression and self-regulation. Mothers reported on the temperament of children and parenting behavior. The rejection/neglect by mothers, child temperament, and daycare experiences were significant predictors of aggression. The moderating effect of self-regulation was found only in daycare experience, which suggests that high self-regulation protects aggression from day care experience.