• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제8권6호
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• pp.151-158
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• 2019

캐시 부채널 공격 중 하나인 FLUSH+RELOAD 공격은 높은 해상도와 적은 노이즈로 여러 악성 프로그램에서도 활용되는 등 비밀 정보의 유출에 대한 위험성이 높은 공격이다. 따라서 이 공격을 막기 위해 실시간으로 공격을 탐지하는 기술을 개발할 필요가 있다. 본 논문에서는 프로세서의 PCM (Performance Counter Monitor)를 이용한 실시간 FLUSH+RELOAD 공격 탐지 기법을 제안한다. 탐지 방법의 개발을 위해 우선 공격이 발생하는 동안 PCM의 여러 카운터들의 값들의 변화를 4가지 실험을 통해 관찰하였다. 그 결과, 3가지 중요한 요인에 의해 공격 탐지를 할 수 있다는 것을 발견하였다. 이를 바탕으로 머신 러닝의 logistic regression과 ANN(Artificial Neural Network)를 사용해 결과에 대한 각각 학습을 시킨 뒤 실시간으로 공격에 대한 탐지를 할 수 있는 알고리즘을 개발하였다. 이 탐지 알고리즘은 일정한 시간동안 공격을 진행하여 모든 공격을 감지하는데 성공하였고 상대적으로 적은 오탐률을 보여주었다.

• Parasites, Hosts and Diseases
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• 제56권6호
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• pp.531-543
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• 2018

Historically, Plasmodium vivax malaria has been one of the most highly endemic parasitic diseases in the Korean Peninsula. Until the 1970s, vivax malaria was rarely directly lethal and was controlled through the Korean Government Program administered by the National Malaria Eradication Service in association with the World Health Organization's Global Malaria Eradication Program. Vivax malaria has re-emerged in 1993 near the Demilitarized Zone between South and North Korea and has since become an endemic infectious disease that now poses a serious public health threat through local transmission in the Republic of Korea. This review presents major lessons learned from past and current malaria research, including epidemiological and biological characteristics of the re-emergent disease, and considers some interesting patterns of diversity. Among other features, this review highlights temporal changes in the genetic makeup of the parasitic population, patient demographic features, and spatial distribution of cases, which all provide insight into the factors contributing to local transmission. The data indicate that vivax malaria in Korea is not expanding exponentially. However, continued surveillance is needed to prevent future resurgence.

• 디지털융복합연구
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• 제16권12호
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• pp.523-531
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• 2018

본 연구는 한국 임금근로자의 근무환경과 업무상 손상과의 관계를 확인하고자 시도되었다. 연구 자료는 4차 근로환경조사(2014) 자료를 이용하여 임금근로자 총 36,292명을 대상으로 분석하였다. 임금근로자의 개인적 요인을 통제한 후, 업무상 손상에 영향을 미치는 요인을 파악하기 위해 다변량 로지스틱 회귀분석을 수행하였다. 개인적 요인을 보정한 상태에서 건강이나 안전에의 위협정도(OR=3.77, 95% CI=2.934-4.844), 주당 49-59시간(OR=1.63, 95% CI=1.023-2.601) 혹은 60시간 이상(OR=2.66, 95% CI=1.683-4.197)의 근무시간, 육체노동직군의 직업분류(OR=1.76, 95% CI=1.218-2.536)가 업무상 손상에 영향을 미치는 요인으로 나타났다. 그러므로 업무상 손상 위험에 취약한 근로자 집단을 위한 업무상 손상 예방 및 관리 전략에 초점을 맞춘 정책적, 사회적 지원 노력이 요구된다.

• Journal of Ginseng Research
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• 제43권4호
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• pp.572-579
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• 2019

Background: Panax ginseng has been used in traditional medicine to strengthen the body and mental well-being of humans for thousands of years. Many elite ginseng cultivars have been developed, and ginseng cultivation has become well established during the last century. However, heat stress poses an important threat to the growth and sustainable production of ginseng. Efforts have been made to study the effects of high temperature on ginseng physiology, but knowledge of the molecular responses to heat stress is still limited. Methods: We sequenced the transcriptomes (RNA-Seq) of two ginseng cultivars, Chunpoong (CP) and Yunpoong (YP), which are sensitive and resistant to heat stress, respectively, after 1- and 3-week heat treatments. Differential gene expression and gene ontology enrichment along with profiled chlorophyll contents were performed. Results: CP is more sensitive to heat stress than YP and exhibited a lower chlorophyll content than YP. Moreover, heat stress reduced the chlorophyll content more rapidly in CP than in YP. A total of 329 heat-responsive genes were identified. Intriguingly, genes encoding chlorophyll a/b-binding proteins, WRKY transcription factors, and fatty acid desaturase were predominantly responsive during heat stress and appeared to regulate photosynthesis. In addition, a genome-wide scan of photosynthetic and sugar metabolic genes revealed reduced transcription levels for ribulose 1,5-bisphosphate carboxylase/oxygenase under heat stress, especially in CP, possibly attributable to elevated levels of soluble sugars. Conclusion: Our comprehensive genomic analysis reveals candidate loci/gene targets for breeding and functional studies related to developing high temperature-tolerant ginseng varieties.

• The Plant Pathology Journal
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• 제37권1호
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• pp.36-46
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• 2021

Acidovorax citrulli (Ac) is the causal agent of bacterial fruit blotch (BFB) in watermelon, a disease that poses a serious threat to watermelon production. Because of the lack of resistant cultivars against BFB, virulence factors or mechanisms need to be elucidated to control the disease. Glycerol-3-phosphate dehydrogenase is the enzyme involved in glycerol production from glucose during glycolysis. In this study, we report the functions of a putative glycerol-3-phosphate dehydrogenase in Ac (GlpdAc) using comparative proteomic analysis and phenotypic observation. A glpdAc knockout mutant, AcΔglpdAc(EV), lost virulence against watermelon in two pathogenicity tests. The putative 3D structure and amino acid sequence of GlpdAc showed high similarity with glycerol-3-phosphate dehydrogenases from other bacteria. Comparative proteomic analysis revealed that many proteins related to various metabolic pathways, including carbohydrate metabolism, were affected by GlpdAc. Although AcΔglpdAc(EV) could not use glucose as a sole carbon source, it showed growth in the presence of glycerol, indicating that GlpdAc is involved in glycolysis. AcΔglpdAc(EV) also displayed higher cell-to-cell aggregation than the wild-type bacteria, and tolerance to osmotic stress and ciprofloxacin was reduced and enhanced in the mutant, respectively. These results indicate that GlpdAc is involved in glycerol metabolism and other mechanisms, including virulence, demonstrating that the protein has pleiotropic effects. Our study expands the understanding of the functions of proteins associated with virulence in Ac.

• 융합보안논문지
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• 제20권4호
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• pp.135-141
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• 2020

국방부는 주기적인 사이버방호 훈련을 실시함에 따라 사이버작전의 전력과 역량을 보강하고 있다. 하지만 적 사이버공격 능력 수준을 고려할 때 군의 사이버방호 능력 수준은 현저히 낮으며 군용 네트워크망에 대한 사이버위협을 대응할 수 있는 보호대책과 대응체계가 명확하게 설계되어 있지 않아 민·관의 사이버보안 능력 수준에도 못 미치고 있는 실태이다. 따라서 본 논문에서는 국내·외 사이버보안 프레임워크를 참조하여 국방 네트워크망 취약점 완화 체계를 구축할 수 있는 요소로 군 특수성을 지닌 군 내부망 주요 위협 정보 및 국방정보시스템 보안 요구사항을 파악하고, 공격자의 의도파악과 전술, 기법 및 절차 정보(ATT&CK)를 적용하여 국방 네트워크 환경에 대한 사이버공격을 효율적으로 보호 해주는 군 내부망 취약점 완화 체계 구축 방안을 제안한다.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제2권2호
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• pp.114-119
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• 2021

To restore the Gold-spotted pond frog (Pelophylax chosenicus), a Korean endangered frog, 600 captive-reared individuals were reintroduced between August and September 2019 into an aquatic garden in the National Institute of Ecology where P. chosenicus had previously inhabited. After reintroduction, six post-release monitoring sessions were conducted from August 2019 to May 2020. Monitoring was performed using three methods (counting calls, observation, and capture) from sunset to midnight near release sites, eliminating potential threat factors. Snout-vent lengths and body weights of recaptured individuals were measured before they were released immediately. We noted that both snout-vent lengths and body weights of recaptured individuals were slightly higher than those before. The average recapture rate was 4.66%. Reintroduced frogs were recaptured at the last monitoring session conducted in May 2020, indicating that these reintroduced frogs hibernated during the winter successfully. We found that these reintroduced frogs successfully settled after release. This result will be useful for establishing management strategies for endangered frogs in Korea. Particularly, post-release monitoring could be an essential approach in the restoration program of a target species.

• 산업융합연구
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• 제20권6호
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• pp.7-15
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• 2022

최근 4차 산업혁명 시대 도래에 따른 AI, 빅데이터 기술 발전으로 인해 신규 사업으로 떠오르고 있는 메타버스 산업이 부각되고 있다, 특히 이러한 관점에 본 논문은 메타버스 역사와 한국 메타버스 시장에서 가장 주목받고 있는 '제페토'의 장·단점을 분석함으로서 이를 기반으로 향후 발전해 나갈 수 있는 적절한 방향을 제시하고자 하였다. 본 연구를 수행하고자 먼저 초기 기업 분석방법으로 SWOT분석 기법을 활용하여 강점과 약점, 기회와 위협 요건을 살펴보고 각각에 요인현황을 도출하고자 하였다. 이후 도출된 각각의 요인들을 토대로 TOWS 발전전략을 모색하고 이를 기반으로 유의한 시사점을 제시하고자 하였다.

• 정보보호학회논문지
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• 제31권6호
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• pp.1181-1191
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• 2021

팬데믹 현상은 원격으로 문제를 해결할 수 있는 비대면 환경을 빠르게 발전시켰다. 하지만 급작스러운 비대면 환경으로 전환은 다양한 부분에서 새로운 보안 이슈들을 발생시켰다. 새로운 보안 이슈들 중 하나가 내부자에 의한 보안 위협이었고 이를 방어하기 위한 기술로 제로 트러스트 보안 모델이 다시 주목받게 되었다. SDP(Software Defined Perimeter) 기술은 다양한 보안 요소로 이루어져 있는데 이 중 디바이스 유효성 검증이라는 기술이 내부자의 사용 행위를 모니터링 하여 제로 트러스트 보안 모델을 실현할 수 있는 기술이다. 하지만 현재 SDP 명세서에는 디바이스 유효성 검증을 수행할 수 있는 기술이 제시되어 있지 않다. 따라서 본 논문에서는 SDP 환경에서 사용자 행위 모니터링을 통한 SVDD 기반 이상행위 탐지 기술을 이용해 디바이스 유효성 검증 기술을 제안하고 성능 평가를 진행하여 SDP 환경의 디바이스 유효성 검증 기술을 수행할 수 있는 방안을 제시한다.

• 임상간호연구
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• 제28권2호
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• pp.99-111
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• 2022

Purpose: This study aimed to identify the relationship between the experiences of workplace violence and post-traumatic stress disorder and the moderating effect of resilience and social support at work on the relationship in tertiary hospital nurses. Methods: This was a descriptive correlation study to confirm the moderating effect of resilience and social support at work on the factors affecting post-traumatic stress disorder for nurses who have experienced violence. A total of 146 registered nurses were recruited from a tertiary hospital from March to July 2020. The Participants who worked for more than one year and experienced violence at work completed self-reported questionnaires that measured the experiences of workplace violence and post-traumatic stress disorder, resilience, social support at work, and demographic information. The collected data were analyzed using t-test, ANOVA, Pearson's correlation coefficient, and hierarchical regression analysis. Results: The nurses experienced verbal abuse an average of 3.70±2.06 times a week, physical threat an average of 2.30±1.71 times a month, and physical assault an average of 0.76±0.82 times a year. The Experiences of workplace violence were significantly increased post-traumatic stress disorder. The result also showed that resilience moderated the relationship between the experience of verbal abuse and post-traumatic stress disorder in hospital nurses. However, there was no significant moderating effect of social support between workplace violence and post-traumatic stress disorder. Conclusion: The experiences of workplace violence influenced post-traumatic stress disorder in nurses and were moderated by resilience. Therefore, hospital administrators need to develop and provide a workplace violence prevention and resilience reinforcement program to reduce post-traumatic stress disorder in nurses. In addition, we suggest further research on the effect of social support in a workplace on the experiences of violence.