Montgomery Multiplier with Very Regular Behavior

백유진 한국인터넷방송통신학회 2024 International Journal of Internet, Broadcasting an Vol.16 No.1

As listed as one of the most important requirements for Post-Quantum Cryptography standardization process by National Institute of Standards and Technology, the resistance to various side-channel attacks is considered very critical in deploying cryptosystems in practice. In fact, cryptosystems can easily be broken by side-channel attacks, even though they are considered to be secure in the mathematical point of view. The timing attack(TA) and the simple power analysis attack(SPA) are such side-channel attack methods which can reveal sensitive information by analyzing the timing behavior or the power consumption pattern of cryptographic operations. Thus, appropriate measures against such attacks must carefully be considered in the early stage of cryptosystem's implementation process. The Montgomery multiplier is a commonly used and classical gadget in implementing big-number-based cryptosystems including RSA and ECC. And, as recently proposed as an alternative of building blocks for implementing post quantum cryptography such as lattice-based cryptography, the big-number multiplier including the Montgomery multiplier still plays a role in modern cryptography. However, in spite of its effectiveness and wide-adoption, the multiplier is known to be vulnerable to TA and SPA. And this paper proposes a new countermeasure for the Montgomery multiplier against TA and SPA. Briefly speaking, the new measure first represents a multiplication operand without 0 digits, so the resulting multiplication operation behaves in a very regular manner. Also, the new algorithm removes the extra final reduction (which is intrinsic to the modular multiplication) to make the resulting multiplier more timing-independent. Consequently, the resulting multiplier operates in constant time so that it totally removes any TA and SPA vulnerabilities. Since the proposed method can process multi bits at a time, implementers can also trade-off the performance with the resource usage to get desirable implementation characteristics.

아스피린의 심혈관질환 및 암 예방효과

백유진,윤종률 대한의사협회 2014 대한의사협회지 Vol.57 No.4

Cardiovascular disease (CVD) is the one of the leading causes of death in Korea. Aspirin, well known for its antiplateletfunction, has been used for the secondary prevention of CVD during the first few several decades. However, whetheror not to have a protective effect on the primary prevention of CVD in apparently healthy people is still controversial. In addition, accumulating data suggest aspirin may have a favorable possibility on cancer incidence and mortality. Wereviewed the literature, focusing on new evidence on the benefits and risks of aspirin for the prevention of CVD andcancer. Aspirin modestly decreases the risk of non-fatal myocardial infarction and cancer incidence in patients withoutovert CVD and at average cancer risk, but increase the risk of major bleeding. Several guidelines on the use of aspirinfor the primary prevention of CVD stated the need for the prudent assessment of individual CVD risks in the targetpopulation. Currently there's no CVD risk assessment tools based on domestic data available in Korea. Also the bleedingrisk and relatively high incidence of hemorrhagic stroke in Koreans make a difficult decision. Clinicians should give thepatients a balanced information and discuss the effects or harms of taking aspirin on the prevention of CVD and canceraccording to the updated evidence. Patient education for the prevention of CVD is more important and life style changeincluding smoking cessation, weight reduction, and a healthy diet should be emphasized before considering aspirin.

전자담배에 대한 정책 방향

백유진 대한의사협회 2020 대한의사협회지 Vol.63 No.2

E-cigarettes, or electronic nicotine delivery systems, are popular among smokers who are looking for a less harmful alternative to conventional tobacco, and the use of e-cigarettes is affected by existing tobacco control policies. E-cigarettes, which are electronic devices designed to allow the user to inhale nicotine as a vapor, are controversial in terms of their harm reduction claims as it can undermine existing tobacco control policies and has the potential to re-normalize smoking behavior. Currently, many of the chemicals used in e-cigarettes have not been comprehensively disclosed, and there is no adequate data on their emissions. Furthermore, the benefits of e-cigarettes have not been adequately shown. To date, a small number of studies have evaluated e-cigarettes as a harm reduction and cessation aid and have found conflicting findings. Meanwhile, e-cigarette or vaping product use associated lung injury has been identified, and an increased use of e-cigarettes in the youth has also been reported recently in the United States. These raise a great social concern around how to regulate e-cigarettes for the protection of public health. A range of current and proposed legislative and regulatory options exists. Some countries have banned e-cigarettes entirely, while others are ready to regulate e-cigarettes as a type of medicine. A lack of consensus on whether e-cigarettes facilitate or threaten existing tobacco control strategies is driving a discussion on how to regulate e-cigarettes in terms of the protection of public health.

When Star CEO Departs: Moderating Effects of Industry, Firm, and Departing CEO Characteristics

백유진,김언수,성연달 한국경영학회 2015 經營學硏究 Vol.44 No.3

Since Hambrick and Mason’s watershed essay on upper echelons, there has been much discussion concerning the performance effect during a CEO’s tenure in office. In this research stream, the current study notes the limitation that there is a lack of understanding of a CEO’s departure situation. Among various characteristics of CEOs, this study focuses on the CEO celebrity, because we believe that a star CEO’s departure has a significant impact on firm performance. To explain the interrelationship between star CEO departure and firm performance, we adopt a resource-based view and human capital theory. Unlike prior research, we highlight a resource-loss situation rather than a resource acquisition. The current study posits that the star CEO’s human capital is more valuable and non-substitutable for the firm; thus, resource loss resulting from the star CEO’s departure leads to negative performance. Moreover, this study suggests that star CEO departure effects are context-specific and there are more negative performance consequences of star CEO departure when the firm highly depends on the CEO. We have four moderators in order to examine whether the effect of star CEO departure is contingent on certain situations. Using the data on CEO succession events during 2005-2012 in Korea, we find that star CEO departure has a detrimental effect on subsequent firm performance relative to the case of non-star CEO departure. Tests on moderating effects show that the effect of star CEO departure is more negative when the industry is highly dynamic, the firm has low level of slack, or the departing CEO has had long tenure as the CEO. Finally, we close the study with implications and future research directions.

어린이의 이하선에서 발생한 망상형 신경섬유종 - 증례보고 및 문헌고찰 -

백유진,김옥준,쿠니,김지선,김상우,전상미,최홍란 대한구강악안면병리학회 2015 대한구강악안면병리학회지 Vol.39 No.2

We present a case of intraparotid plexiform neurofibroma in a 7-year-old man. The lesion was determined as plexiform neuroma in histopathological findings, but final diagnosis was plexiform neurofibroma considering his familiy history of neurofibromatosis and cafe au lait spots on his body. Currently we are executing follow-up after removing the tumor with surgery. Plexiform neurofibroma can develope at any point along a nerve and spread out either just under the skin or deeper in the body. According to the literature, the most common site of plexiform neurofibroma is mouth and face in the head and neck region. Also, plexiform neurofibroma occurs at 8.8-year-old in neurofibromatosis typeⅠ patient with familial history. Because of interlacing with adjacent normal tissue and the invasive nature we have difficult resecting the mass completely. So when the tumor turns symptomatic or disfiguring leading to an aesthetic problem, surgery had better be undertaken.

서울지역 여고생의 체중조절, 우울 및 비만에 따른 식사태도

백유진,강현은,임강은,임수영,황승주,유태우 대한가정의학회 2001 Korean Journal of Family Medicine Vol.22 No.5

[세계는 지금] 세계 경제지도가 바뀐다 6 : 아시아 다섯 번째 호랑이 말레이시아

백유진 평화문제연구소 2011 통일한국 Vol.330 No.-

마음챙김 훈련의 체중 조절 효과에 대한 구조화된 문헌고찰

백유진,옥정,이언숙 대한임상건강증진학회 2019 Korean Journal of Health Promotion Vol.19 No.4

체중 감량과 식이장애 교정에서 마음챙김 훈련에 대한 관심이 증가하고 있다. 일반적인 비만 치료로는 생활습관 교정, 약물 치료 및 수술적 치료가 있으며, 대부분 치료 효과가입증되어 있고 임상적으로 많이 사용되고 있지만, 치료 효과에 대한 개인차가 크다. 또한 비만 치료의 장기 효과는 불확실하기 때문에 새로운 치료법에 대한 요구가 있다. 더구나스트레스성 폭식 또는 식이장애가 있는 경우 체중 감량이 어렵고, 체중 감량 이후에도 체중이 다시 증가할 가능성이 높다. 체중 감소와 정서적 식이장애에 대한 초기 연구에서 마음챙김 훈련 치료는 효과가 있었다. 본 연구에서 구조화된문헌 리뷰를 통하여 마음챙김 훈련 중재 연구에서 체중 감소와 식이장애에 대한 효과를 평가하였다. 19개 문헌을 리뷰한결과 순응도가 좋았던 대상자에서 정서적 폭식 또는 식이장애에 대해 마음챙김 훈련이 효과가 있었지만 체중 감량 효과는 복합적이었다. 리뷰한 대부분 논문이 소규모 연구이므로체중 감량/식이장애에 대한 마음챙김 훈련의 장기 효과를확인하기 위해서는 대규모 연구가 필요하다. Mindfulness training is growing in popularity as an adjunctive intervention in disordered eating and weight loss. Lifestyle modification, pharmacologic treatment, and surgical intervention have been widely used for weight reduction in obese persons, but these modifications are sometimes insufficient. In particular, stress-induced eating and binge-eating disorder have been frequently associated with increased risk of regaining weight. Initial research suggests that mindfulness training may be an effective intervention for binge eating. In this article, we reviewed 19 studies that investigated mindfulness training as an intervention for weight change and/or emotional eating. Results suggest that mindfulness training effectively decreases emotional eating in persons with good adherence to the training; evidence for its effect on weight reduction, however, is mixed. Further large-scale studies are warranted to explore the effectiveness of mindfulness training on long-term weight loss and emotional eating in persons with obesity.

100 g 경구 당부하 검사법의 변형을 통한 임신성 당뇨병의 진단

백유진,조금준,오윤경,여혜민,설현주,홍순철,김해중,허준용,오민정 대한산부인과학회 2008 대한산부인과학회 학술대회 Vol.94 No.-

VISSIM에서의 BIM기반 설계 데이터 사용성 분석

백유진,윤영만,최아람,김성호,신재철 한국도로학회 2023 한국도로학회 학술대회 발표논문 초록집 Vol.2023 No.10