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A Theoretically Sound Approach to Analog Circuit Sizing
Eunji Lim,Jaehyouk Choi,Youngmin Kim 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.2
We consider the problem of determining the sizes of electrical components in analog circuits, such as operational amplifiers, that maximize a primary performance measure while satisfying some conditions on secondary performance measures. We propose a method that uses a circuit simulator, such as SPICE, to evaluate the performance measures exactly and updates the sizes of the electrical components iteratively using an optimization procedure, which is a variant of the Lagrangian method. The proposed approach guarantees convergence to a local optimal solution under mild conditions. Numerical results demonstrate that the proposed method finds optimal sizes successfully in various circuits including one-stage and two-stage operational amplifiers, a voltage-controlled oscillator, and an inverter chain.
Adrapsa notigera (Lepidoptera: Erebidae: Herminiinae) new to Korea
Eunji Lim,Jun-Mo Koo,Soowon Cho 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
The genus Adrapsa Walker, 1859 belongs to Herminiinae of Erebidae in Lepidoptera. In Korea, only one species, Adrapsa simplex (Butler, 1879) has been recorded so far. Here we add another species, Adrapsa simplex (Butler, 1879) as a new record to the Korean fauna. A short description for the species is given with adult images of male and female and their genitalia, and its COI barcode sequence is also provided.
( Eunji Kang ),( Chaegil Lim ),( Hyoungwon Lim ) 대한물리치료학회 2023 대한물리치료학회지 Vol.35 No.6
Purpose: Due to the high incidence of shoulder injuries, including shoulder impingement syndrome (SIS), among CrossFit practitioners due to frequent overhead movements, serratus anterior exercises are considered crucial for scapular stabilization in both intervention and prevention. Objective: The objective of this study is to compare the muscle activity and ratios of scapular stabilizing and shoulder girdle muscles between individuals with and without SIS during serratus punch and wall slide exercises, both targeting the serratus anterior muscle, in CrossFit training practitioners. Methods: Surface electromyography was used to compare the muscle activity and activity ratio of scapular stabilizing muscles and shoulder muscles during serratus punch and wall slide exercises in two groups of 20 CrossFit practitioners: ten with SIS and ten without symptoms. Results: The group with SIS showed higher activation of the pectoralis major, upper trapezius, and a higher pectoralis major/serratus anterior and upper trapezius/serratus anterior muscle activation ratio during the serratus punch exercise compared to the group without SIS. Similarly, during the wall slide exercise, the group with SIS exhibited higher activation of the upper trapezius and a higher upper trapezius/serratus anterior muscle activation ratio compared to the group without SIS. However, no significant difference in serratus anterior muscle activation was observed between the two groups. Conclusions: This study highlights the higher activation of the pectoralis major and upper trapezius muscles in CrossFit practitioners with SIS during the serratus anterior exercise, suggesting the importance of minimizing the overactivation of these muscles to prevent impingement syndrome in this population.
Eunji Lim,Bong-Jo Kim,Cheol-Soon Lee,Boseok Cha,So-Jin Lee,Ji-Yeong Seo,Jae-Won Choi,Young-Ji Lee,Nuree Kang,Seung Chan Kim,Dongyun Lee 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.10
Objective The suicide rate in Korea was the highest among countries in the Organisation for Economic Co-operation and Development in 2019. In a previous study, higher intake of vegetables and fruits was associated with a lower risk of suicidal ideation, and carotene-rich fruits and vegetables lowered the risk of depression. This study aimed to examine the direct relationship between carotene intake and suicidal ideation, adjusting for the effect on depression. Methods This study used data from the Korea National Health and Nutrition Examination Survey (KNHANES) conducted in 2012, 2013, and 2015. Carotene intake was assessed through a food intake frequency survey with a 24-hour recall. Suicidal ideation and depression were assessed using the mental health section of the KNHANES. We applied logistic regression to assess the relationship between carotene intake and suicidal ideation, adjusting for potential confounders. Results A total of 5,480 females aged 19-64 years were included in this study. Carotene intake was significantly lower in the suicidal ideation group (3,034.5±1,756.4 μg/day) than in the nonsuicidal ideation group (3,225.4±1,795.1 μg/day) (p=0.015). We found a significant inverse association between carotene intake and the risk of suicidal ideation after adjusting for potential confounders (odds ratio=0.934, 95% confidence interval=0.873-0.999). Conclusion These results suggest that carotene intake may be inversely associated with the risk of suicidal ideation. Our findings may inform the development of new nutritional interventions to prevent increases in the risk of suicide worldwide.
머신러닝을 활용한 행위 및 스크립트 유사도 기반 크립토재킹 탐지 프레임워크
임은지(EunJi Lim),이은영(EunYoung Lee),이일구(IlGu Lee) 한국정보보호학회 2021 정보보호학회논문지 Vol.31 No.6
최근 급상승한 암호 화폐의 인기로 인해 암호 화폐 채굴 악성코드인 크립토재킹 위협이 증가하고 있다. 특히 웹기반 크립토재킹은 피해자가 웹 사이트에 접속만 하여도 피해자의 PC 자원을 사용해 암호 화폐를 채굴할 수 있으며 간단하게 채굴 스크립트만 추가하면 되기 때문에 공격이 쉽고 성능 열화와 고장의 원인이 된다. 크립토재킹은 피해자가 피해 상황을 인지하기 어렵기 때문에 크립토재킹을 효율적으로 탐지하고 차단할 수 있는 연구가 필요하다. 본 연구에서는 크립토재킹의 대표적인 감염 증상과 스크립트를 지표로 활용하여 효과적으로 크립토재킹을 탐지하는 프레임워크를 제안하고 평가한다. 제안한 크립토재킹 탐지 프레임워크에서 행위 기반 동적 분석 기법으로 컴퓨터 성능지표를 학습한 K-Nearest Neighbors(KNN) 모델을 활용했고, 스크립트 유사도 기반 정적 분석 기법은 악성 스크립트 단어 빈도수를 학습한 K-means 모델을 크립토재킹 탐지에 활용했다. 실험 결과에 따르면 KNN 모델은 99.6%의 정확도를 보였고, K-means 모델은 정상 군집의 실루엣 계수가 0.61인 것을 확인하였다. Due to the recent surge in popularity of cryptocurrency, the threat of cryptojacking, a malicious code for mining cryptocurrencies, is increasing. In particular, web-based cryptojacking is easy to attack because the victim can mine cryptocurrencies using the victim"s PC resources just by accessing the website and simply adding mining scripts. The cryptojacking attack causes poor performance and malfunction. It can also cause hardware failure due to overheating and aging caused by mining. Cryptojacking is difficult for victims to recognize the damage, so research is needed to efficiently detect and block cryptojacking. In this work, we take representative distinct symptoms of cryptojacking as an indicator and propose a new architecture. We utilized the K-Nearst Neighbors(KNN) model, which trained computer performance indicators as behavior-based dynamic analysis techniques. In addition, a K-means model, which trained the frequency of malicious script words for script similarity-based static analysis techniques, was utilized. The KNN model had 99.6% accuracy, and the K-means model had a silhouette coefficient of 0.61 for normal clusters.
임은지(Eunji Lim),김봉조(Bong-Jo Kim),이철순(Cheol-Soon Lee),차보석(Boseok Cha),이소진(So-Jin Lee),서지영(Jiyeong Seo),최재원(Jae-Won Choi),이영지(Young-Ji Lee),이윤정(Younjung Lee),이동윤(Dongyun Lee) 대한노인정신의학회 2021 노인정신의학 Vol.25 No.1
Objective: To investigate perceptions of coronavirus disease-19 (COVID-19) associated with anxiety caused by the COVID-19 epidemic in the elderly who are vulnerable to mental health problems. Methods: This study used data of a survey on perceptions of COVID-19 and changes in mental health of 1,000 out of residents in a province of Korea in April 2020. The survey included questions about psychological perceptions for COVID-19. Subjects were dived into two groups (<60 and ≥60). Binary logistic regression analyses were performed for evaluating the association between anxiety and perceptions about COVID-19 in each group. Results: Results of binary logistic regression analyses revealed that only ‘fear of getting infected myself’among perceptions for COVID-19 was associated with anxiety in the elderly aged more than 60 years. However, in adults aged less than 60 years, all perceptions for COVID-19 except impairment of performance were associated with such anxiety. Conclusion: We found that the anxiety for COVID-19 in elderly with age over 60 years was associated with ‘fear of getting infected myself’ rather than ‘fear of family or people around them’, unlike adults aged less than 60 years. These results can be applied in strategies for psychological quarantine against COVID-19 among the elderly.