국민건강보험공단 금연치료지원사업

백유진,최재경,이언숙,조민우 대한의사협회 2018 대한의사협회지 Vol.61 No.3

Smoking cessation services are an important component of preventive medicine. Physicians can help smokers quit smoking by assessing their dependence and motivating them during their clinic visits. Brief advice provided by doctors is a simple and very cost-effective method of smoking cessation. The most effective method of helping smokers stop smoking is combining pharmacotherapy with counseling and behavioral interventions. In early 2015, the National Health Insurance Service started a smokingcessation support program that covered consultation and drug fees across the country. More than 400,000 smokers registered in this program and received assistance from doctors in 2016. The success rate at 6 months after registration was approximately 40%, which is comparable with that of smoking cessation clinics run by public health centers in local areas. Additional efforts are needed to increase the coverage levels of smoking cessation services in Korea.

고등학생 논설문 쓰기에서 내용 생성 단계의 인지 과정 탐색

백유진 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.24

The purpose of this study is to investigate the cognitive process of generating ideas in high school student’s persuasive writing and to analyze what cognitive differences are shown by the level of writing. This is to provide information about the writer's cognitive process to teachers. First, In the stage of generating ideas for persuasive writing, it has been shown that writers mostly use the Internet and collect data mainly related to specific cases. Second, the problem-solving process for generating ideas consist of "searching data", "selecting data", "arranging data" and it turned out that it is "selecting data" that writers put the most cognitive effort into. Third, proficient writers go through more cognitive process and create richer ideas than non-proficient writers, there is significant differences in "selecting of data". Forth, proficient writers tend to keep the data until writing stage and not to add new data compared to non-proficient writers. Based on these results, this study proposed that information on how to utilize the numerous data for writing, how to generate ideas combining Internet data and background knowledge, and the cognitive process of ‘selecting data' should be embodied in writing education. 본고는 고등학생 필자들이 논설문을 작성하기 위한 내용을 생성하는 단계에서 보이는 인지 과정을 탐색하고, 쓰기 수준별로 어떠한 차이를 보이는지 분석함으로써 학교 현장에서 실질적으로 활용될 수 있는 필자의 인지 과정에 대한 정보를 제공하고자 하였다. 연구 결과는 다음과 같다. 첫째, 필자들은 논설문 쓰기를 위한 내용 생성 단계에서 대부분 인터넷을 활용하며 주로 구체적 사례와 관련된 자료를 수집하는 것으로 나타났다. 둘째, 내용 생성 단계의 인지 과정은 ‘자료 탐색’, ‘자료 선정’, ‘자료 정리’로 구성되어 있으며, 필자들은 ‘자료 선정’ 과정에 가장 많은 인지적 노력을 쏟는 것으로 나타났다. 셋째, 능숙한 필자들은 미숙한 필자들보다 더 많은 인지 과정을 거쳐, 더 풍부한 내용을 생성하는 것으로 나타났다. 넷째, 능숙한 필자들은 미숙한 필자들에 비해 내용 생성 단계에서 생성한 자료들을 최종 글을 쓸 때까지 유지하는 경향이 있는 것으로 나타났다. 이러한 결과를 바탕으로 자료와 정보들을 글에 활용하는 방법, 인터넷 자료와 배경 지식을 관련지어 내용을 생성해 내는 방법, ‘자료 선정’ 의 인지 과정에 관한 정보들을 쓰기 교육 내용으로 구체화시킬 것을 제안하였다.

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.

Random Point Blinding Methods for Koblitz Curve Cryptosystem

백유진 한국전자통신연구원 2010 ETRI Journal Vol.32 No.3

While the elliptic curve cryptosystem (ECC) is getting more popular in securing numerous systems, implementations without consideration for side-channel attacks are susceptible to critical information leakage. This paper proposes new power attack countermeasures for ECC over Koblitz curves. Based on some special properties of Koblitz curves, the proposed methods randomize the involved elliptic curve points in a highly regular manner so the resulting scalar multiplication algorithms can defeat the simple power analysis attack and the differential power analysis attack simultaneously. Compared with the previous countermeasures, the new methods are also noticeable in terms of computational cost.

Simple Countermeasure to Cryptanalysis against Unified ECC Codes

백유진 한국통신학회 2010 Journal of communications and networks Vol.12 No.1

As a countermeasure to simple power attack, the unified point addition codes for the elliptic curve cryptosystem were introduced. However, some authors proposed a different kind of power attacks to the codes. This power attack uses the observation that some internal operations in the codes behave differently for addition and doubling. In this paper, we propose a new countermeasure against such an attack. The basic idea of the new countermeasure is that, if one of the input points of the codes is transformed to an equivalent point over the underlying finite field, then the code will behave in the same manner for addition and doubling. The new countermeasure is highly efficient in that it only requires 27(n − 1)/3 extra ordinary integer subtractions (in average) for the whole n-bit scalar multiplication. The timing analysis of the proposed countermeasure is also presented to confirm its SPA resistance.

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.

국어 교사의 음성에 대한 고등학생들의 선호도 조사

백유진,박영민 한국어교육학회 2024 한국어교육학회 학술발표논문집 Vol.2024 No.0

[KCS 하이라이트] ⑮ 산화금속 나노입자 관련 연구

백유진,윤홍석 대한화학회 2023 화학세계 Vol.63 No.3

글 유형에 따른 예비국어교사의 평가 특성 분석

백유진,박영민 한국교원대학교 교육연구원 2021 敎員敎育 Vol.37 No.2

이 연구의 목적은 글 유형에 따른 예비교사의 평가 특성을 분석하여 교원 양성 과정에서의 구체적인 평가자 교육 방안을 제안하는 것이다. 이를 위해 2015년, 2016년, 2017년, 2019년에 국내 사범대학에 재학 중이었던 예비교사 133명으로부터 설명문 40편과 논설문 40편에 대한 평가 결과를 수집한 후 글 유형에 따른 평가자의 엄격성 및 일관성, 평가자와 글 유형 간 편향의 특징을 살펴보았다. 이 연구의 결과는 다음과 같다. 첫째, 예비교사의 엄격성은 글 유형에 따라 크게 변하지 않는 것으로 나타났다. 둘째, 예비교사의 일관성 수준은 글 유형에 따라 크게 변하지 않는 것으로 나타났지만, 일부 예비교사는 글 유형에 관계없이 부적합이나 과적합 경향을 보이거나, 특정 글 유형에 부적합 혹은 과적합 경향을 보이는 것으로 나타났다. 셋째, 예비교사 중 약 1/3은 특정 글 유형에 편향을 보이는 것으로 나타났다. 이 결과를 바탕으로 교원 양성 과정에서의 다루어야 할 평가자 교육 방안을 제시하였다. The purpose of this study is to analyze the assessment characteristics of pre-service Korean language teachers according to writing type and to propose assessment education in the teacher training process. For this purpose, assessment results for 40 expository writings and 40 persuasive writings of 133 pre-service Korea language teachers who were attending domestic university in 2015, 2016, 2017, 2019 were collected and the characteristics of their severity and consistency, bias between evaluators and writing type, bias between gender of evaluator and writing type were examined. The results obtained from this study are as follows. First, it has been shown that the severity of pre-service Korea language teachers according to writing type does not change significantly. Second, while the level of consistency of pre-service Korea language teachers according to writing type does not change significantly, but some pre-service Korea language teachers tend to show misfit or overfit when assessment expository writing and/or persuasive writing. Third, about one-third of pre-service Korea language teachers have shown bias according to writing type. Fourth, some male pre-service Korea language teachers showed bias according to writing type. Based on these results, way of the evaluator education was proposed in the teacher training process.

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.