SYN Flood 취약점 및 IPS 아키텍쳐 연구

한미란,김근희,강영모,김종배 사단법인 인문사회과학기술융합학회 2016 예술인문사회융합멀티미디어논문지 Vol.6 No.2

특정 사이트를 집중 공격해 정상적인 서비스를 불가능하도록 하는 DDos 공격의 수단과 방법이 갈수록 진화하고 있다. 일단 감염이 되면 이용자는 정상적으로 접속할 수 없고 주컴퓨터는 치명적 손상을 입을 수 있으며 해킹의 숙주로 이용될 수도 있다. 그 중 대표적인 서비스 거부 공격방법으로 TCP/IP의 3-Way handshake 원리를 이용한 SYN Flood 공격 기법에 관해 연구하였다. SYN Flood이란 DoS 공격의 일종으로 네트워크에 연속적인 SYN패킷을 보내서 서버의 수요 용량(큐)를 넘치게 하는 네트워크 공격 방법이다. 분산 서비스 거부(DDoS)의 경우 서비스거부(DoS)공격과 달리 공격의 원인과 공격자를 추적하기 어려울 뿐 아니라 공격시 감지가 되어도 뚜렷한 해결 방안이 없다. 본 논문에서는 SYN Flood 공격의 원인을 분석하고 보안 취약점을 해결하기 위한 IPS 방어 정책을 연구하였다. 또한 외부의 악의적인 공격에 효과적으로 방어하기 위해서 SYN Flood 방어 정책 설계를 기반으로 IPS 시스템을 제시하고자 한다. DDos attack evolves by degrees, in terms of means and methods, to disable the regular system by giving concentrate attack to a certain site. Once infected users cannot normally connect to the server. Main computer can cause fatal damage and may be used as a host of hacking. We studied in the SYN Flood attack methods as the representative service denial attack method by using a 3-Way handshake principle of the TCP / IP. It attacks network by sending sequential SYN packets to make capabilities (que) overflow. For a distributed denial of service (DDoS) unlike denial of service (DoS) attacks as well as other difficult to trace the cause of the attack and attack an attacker detected no clear solution. Therefore, this study aims to understand SYN Flood attacks’ causes and solutions, and establish defense policies to solve security vulnerabilities. In addition, we propose an IPS system based on the SYN Flood defense policy to defend against malicious external attacks

Tocilizumab-associated ileal perforation in a patient with rheumatoid arthritis in COVID19 infection

한미란,최윤정,류완희,강명재 대한내과학회 2022 대한내과학회 추계학술대회 Vol.2022 No.2

구아바 잎 추출액을 이용한 직물의 천연염색 III - 한지면직물의 염색성과 기능성 -

한미란,이정숙 한국의류산업학회 2012 한국의류산업학회지 Vol.14 No.5

The natural dyeing of hanji cotton fabrics with guava leaf extract was investigated. The temperature and time of dyeing were 40°C and 90°C for eighty minutes, respectively. In addition, the dyebath has been set at pH 5. Sn pre-mordanted fabrics showed the highest K/S value. Regardless of dyeing temperature, K/S values were high when Al, Cu, Femordanted fabrics were dyed in post-mordanting and Sn-mordanted fabrics in pre-mordanting. The dyeing equilibrium was shown at the fourth time of repeated dyeing. In the processing of hanji cotton fabrics, K/S value was high when hanji cotton fabric was treated with soybean milk at 90°C. Similar K/S value of dyeing was shown when fabrics were processed with chitosan, regardless of dyeing temperature. High K/S value of dyeing was seen when fabrics processed with gallnut tannin at 40. Fabrics dyed with acidic water extract showed yellowish color. Fabrics dyed with alkaline water extract showed reddish color, and fabrics dyed with ethanol extract showed greenish yellow color. In case of Sn-mordanted fabrics,the washing fastness level was between 3 to 4, and other dyed fabrics showed low fastness. The dry cleaning fastness also showed very excellent result with level 4-5. The rubbing fastness of the fabrics was better in dry rubbing than in wet rubbing. For the light fastness, all dyed fabrics showed low fastness. For antibacterial activity, the dyed fabrics with guava leaf extract showed 99.9% of high antibacterial activity. Hanji cotton fabric maintained certain deodorization in the state of raw fabric. All dyed fabrics showed higher UV protection rate than control fabric.

한국인 상용식품의 요오드 데이터베이스 구축과 한국 성인의 요오드 섭취 실태 및 갑상선질환과의 연관성 연구

한미란,주달래,박영주,백희영,송윤주 대한갑상선학회 2015 International Journal of Thyroidology Vol.8 No.2

Background and Objectives: Iodine is essential for thyroid hormone production and the iodine intake of Koreans is high. Few studies have examined the association between iodine intake and thyroid disease in the Korean population due to the lack of an iodine database. Therefore, this study established an iodine database, evaluated iodine intake levels, and explored the association between iodine intake and thyroid disease. Materials and Methods: We obtained data for 9998 subjects who had both biochemical and dietary data from the 2007-2009 Korea National Health and Nutrition Examination Survey. Results: An iodine database was established for 667 food items. The median iodine intake in the population was 375.4 μg per day. The iodine contribution by food group was 65.6% from seaweed, 18.0% from salted vegetables, and 4.8% from fish. When subjects were divided into five groups across quintiles of iodine intake per 1000 kcal, excluding extreme subjects who consumed above the upper limit, age, sex, income, education, drinking, and smoking differed across the groups. While the energy and fat intakes decreased, other nutrients increased across the quintile groups. The consumption of seaweeds, fish, eggs, and salted vegetables increased across the quintile groups. After adjusting for all potential confounding variables, the odds ratio for thyroid disease in the highest quintile was 1.63 compared to that in the lowest quintile (p for trend=0.0352). Conclusion: The iodine intake of the Korean population is high, with high consumption of seaweeds, salted vegetables, and fish positively associated with thyroid disease.

물푸레나무숯을 이용한 직물염색

한미란,이정숙 한국의류학회 2009 한국의류학회 학술대회논문집 Vol.2009 No.1

물푸레나무껍질에 의한 견직물의 염색성 및 세탁견뢰도 향상에 관한 연구

한미란,이정숙 한국의류학회 2008 한국의류학회 학술대회논문집 Vol.2008 No.-

우리나라 청소년의 고탄수화물 식사와 고지방 식사가 대사증후군 위험요인에 미치는 영향: 1998~2009년 국민건강영양조사 자료를 이용하여

한미란,임정현,송윤주 한국영양학회 2014 Journal of Nutrition and Health Vol.47 No.3

Purpose: The prevalence of metabolic syndrome has increased in both the adult population and in adolescents. How-ever, few studies have been conducted for adolescents. The aim of this study was to examine the association of metabolic syndrome and its risk factors with high carbohydrate diet and high fat diet using data from the Korea National Health and Nutrition Examination Survey (1998-2009). Methods: Using the Acceptable Macronutrient Distribution Range for Korean Dietary Reference Intakes, subjects whose energy intake from carbohydrate was greater than 70% and from fat was less than 15% were classified as the ‘High-carbohydrate & low-fat diet (HCLF)’ group and subjects whose energy intake from carbohydrate was less than 60% and from fat was 25% or more were classified as the ‘Low-carbohydrate & high-fat Diet (LCHF)’ group. Among 5,931 eligible subjects, HCLF included 853 subjects and LCHF included 1,084 subjects. Results: The mean age in both groups was 14 years and significant difference in age, BMI, sex, physical activity, and household income was observed between the HCLF and LCHF groups. Regarding the energy intake compared to Estimated Energy Re-quirement, the HCLF group met 79.0% and the LCHF group met 100.3%. Regarding nutrient intake per 1,000 kcal, carbo-hydrate, iron, potassium, and vitamin C intake in the HCLF group were significantly higher, but protein, fat, calcium, phos-phorus, vitamin A, thiamin, riboflavin, and niacin intakes were significantly lower in the HCLF group compared to the LCHF group. After adjusting for age, sex, BMI, study year, household income, physical activity, and energy intake, the serum tri-glycerides level and systolic blood pressure were slightly higher, while the serum HDL-cholesterol level was significantly lower in HCLF than LCHF. The odds ratio of metabolic syndrome did not differ significantly between HCLF and LCHF. Conclusion: Our findings indicate an association of a high carbohydrate diet with increased risks for metabolic syndrome components. Conduct of future studies would be necessary in order to explore the underlying mechanism and to confirm our findings in a prospective study. 본 연구는 제1기~제4기 국민건강영양조사 (1998~2009) 자료를 이용하여 10~18세 청소년을 대상으로 고탄수화물 식사그룹 (HCLF)과 고지방 식사 그룹 (LCHF)의 식사 특성이 대사증후군 위험요인에 미치는 영향에 대해 분석하였다. 1) 에너지 섭취비율은 HCLF 그룹의 경우 탄수화물 : 단백질 : 지질이 76.3 : 12.6 : 11.1 인 반면, LCHF 그룹의 경우 52.9 : 14.7 : 32.4 로 두 그룹 간 유의적 차이가 났으며, 에너지 섭취는HCLF 그룹이 1,733.1 kcal로 LCHF 그룹의 2,233.0 kcal에 비해 유의적으로 낮았다. 2) 두 그룹 간 에너지 섭취를 연령별 에너지 필요 추정량에대비해 평가해보니 HCLF 그룹은 평균 79.0%를 충족하였고, LCHF 그룹은 100.3%를 충족하였다. 3) 에너지 섭취 보정을 위해 1,000 kcal 당의 영양소 밀도로평가해보면 HCLF 그룹은 탄수화물, 나트륨, 철, 칼륨, 비타민C의 섭취량은 유의적으로 높았으나, 단백질, 지방, 칼슘, 인, 비타민 A, 티아민, 리보플라빈, 나이아신의 섭취량은 유의적으로낮았다. 4) 대사증후군 위험요인을 비교해보면, HCLF 그룹에서 LCHF 그룹에 비해 혈청 중성지질 농도와 수축기 혈압은 유의적으로 높았고, 혈청 HDL-콜레스테롤은 유의적으로 낮았다. 다른 지표들은 두 그룹 간 차이가 없었다. 5) HCLF 그룹과 LCHF 그룹 간에 대사증후군 위험요인의위험도와 대사증후군의 교차비는 유의적 차이가 없었다. 본 연구의 결과를 통해 청소년 시기에도 고탄수화물 섭취가대사증후군 지표에 영향을 미친다는 것을 살펴볼 수 있었다. 우리나라 탄수화물 섭취는 매우 높은 편이어서 앞으로 이 시기의 탄수화물의 질적, 양적 섭취 수준과 대사질환과의 관련성연구가 더 이루어져야 하며, 성인기 만성질환으로의 이행에도관련이 있으므로 장기적인 연구가 필요하다고 사료된다.

依赖与独立:風險視角下的中國農村家庭養老 問題研究 -以內蒙古自治區5個村落為例-

韓美蘭,진예 동아인문학회 2019 동아인문학 Vol.46 No.-

The social changes and the increasing risk of old-age pension have made the problems of rural old-age pension face severe challenges. The current rural pension model is mainly based on family pension and supported by social pension for the elderly, and the children are still the main economic supporters of the elderly in rural areas. This paper divides the different models of family pensions for the elderly to accept the pension funds of their children, and explores the dependent and independent level of the elderly in rural areas. The research shows that old people is more and more dependent on their own physical condition and income situation,when the old people's own endowment resources are gradually scarce, they will seek financial support from family internal factors (mainly children) and social external factors. However, there are obvious differences in the independent level of these two kinds of economic support and own endowment resources for the elderly in rural areas. Comparing with social external factors, personal factors and family internal factors (mainly children) play a more regular role in the independent level of the old-age pension mode, which shows that the better the spouse, the better the physical condition, the higher the income level, and the less dependent the children are on the concept of pension, the more independent the pension mode chosen by the rural elderly will be, and the better the economic conditions of the children, the fewer the number of children, the more the elderly tend to independent pension mode. However, there is no obvious rule to follow in the change of the degree of independence of the aged by external factors such as the rich and poor in villages and towns, social security, etc. Therefore, in the current pension mode dominated by family support, especially children’s support and children’s economic subsidies, although social security is the decisive factor affecting the choice of family pension mode, personal factors and family internal factors (mainly children) is still an important force that determines the independent level of pension. 社會的變遷、養老風險的不斷擴大使中國農村養老問題面臨嚴峻挑戰。由於當前的農村養老模式仍以家庭養老為主,社會養老為養老輔助,子女仍是農村老年人養老的主要經濟支持者。因此,本文以老年人接受子女養老資金程度的不同,劃分出不同的家庭養老模式,探究農村老年人養老的依賴與獨立水準變化。研究表明,老年人越來越依賴於自身身體狀況和收入情況,一旦自身養老資源惡化,中國農村老年人就會向家庭內部因素(主要是子女因素)以及社會外部因素尋求經濟支持,但這兩種經濟支持與老年人自身養老資源對農村老年人可選擇的幾種家庭養老模式的獨立水準的作用不盡相同。與社會外部因素相比,個人因素和家庭內部因素(主要是子女因素)對老年人養老模式的獨立水準的作用更具規律性,表現為老年人有配偶、身體狀況越好、收入水準越高、養老觀念上越不想依賴子女,農村老年人所選擇的養老模式就越獨立;子女的經濟條件越好、子女數量越少,老年人越傾向於獨立的養老模式。而社會外部因素諸如村鎮貧富、社會保障等對養老獨立程度變化上沒有明顯的規律可循。因此,在當前家庭養老特別是“子女供養”和“子女補貼”占主導的養老模式中,儘管社會保障是影響家庭養老模式選擇的決定因素,但個人因素和家庭內部因素(主要是子女因素)仍然是決定養老獨立水準的重要力量。

바로크와 로코코 시대의 남성 가발의 재현에 관한 연구

한미란,김효령,김현남 코리아뷰티디자인학회 2006 코리아뷰티디자인학회지 Vol.2 No.2

Double curing unit system을 이용한 복합 레진의 광중합 수축에 관한 연구

한미란,김종수,유승훈 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.2

As a part of an effort to minimize the polymerization shrinkage which is considered to be a major cause of failed bonds to tooth, newly designed ‘Double LED system’ was tested in the present study. Analyses were per- formed on the pattern of micro-leakage and the changes of strain which have occurred during the polymerization process. The results can be summarized as follows: 1. In the strain change, dramatic increase was observed with initiation of polymerization which was followed by subsequent gradual decrease with elapse of time in both the single LED system and double LED system. 2. The single LED system were shown to develop and maintain the maximum stress more than double LED system (p<0.05). 3. Less micro-leakage was found in the double LED system than in the single LED system(p<0.05). From the above-mentioned results, the double LED system can be a very useful tool in a sense of reducing polymerization shrinkage when compared to the single LED system. However, practical problems such as size of curing unit and its application method with its light intensity should be solved before its clinical application. 본 연구는 복합 레진이 광원을 향해 수축이 일어난다는 점에 착안하여 중합 수축 시 필연적으로 발생되는 치질과의 결합 단절을 개선하고자 double light emitting diode(LED) system을 고안하였으며, 중합 수축 시 발생하는 스트레인의 변화를 기록하고 미세 누출의 양상을 관찰하여 비교 분석한 결과 다음과 같은 결론을 얻었다. 1. 스트레인의 변화를 살펴보면, single LED system과 double LED system에서 광중합 개시와 함께 급격히 증가하였다가 시간이 지남에 따라 서서히 감소하는 유사한 수축 응력 양상을 보였다. 2. 최대 응력의 발생과 유지는 double LED system보다 single LED system에서 더 높게 나타났다(p<0.05). 3. Double LED system이 single LED system보다 미세 누출이 더 낮게 나타났다(p<0.05). 이상의 결과를 종합해보면, single LED system에 비해 double LED system에서 중합 수축 응력이 크지 않고 미세 누출도 줄일 수 있어 임상에서 매우 유용한 장비로 사용될 수 있으리라 생각된다. 그러나 두 개의 광원이 구강 내에서 원활하게 움직이기 위해서는 광원의 크기가 충분히 작아야 한다. 현재 개발된 LED는 광량이 충분하지 않아 시술 시간의 단축을 원하는 소아 환자의 접착 수복에서는 어려운 실정이다. 따라서 수복물의 완전한 중합과 중합 시간의 감소를 위해 더 높은 출력의 광원이 필요하고, 이는 LED 광원의 발달에 기대해 볼 수 있으리라 사료된다.