[KCS 하이라이트] ⑮ 산화금속 나노입자 관련 연구

백유진,윤홍석 대한화학회 2023 화학세계 Vol.63 No.3

차분 전력분석 공격에 안전한 논리 게이트 및 SEED 블록 암호 알고리즘과 SHA-1 해쉬 함수에의 응용

백유진 한국정보보호학회 2008 정보보호학회논문지 Vol.18 No.6

The differential power attack (DPA)[8] is a very powerful side-channel attack tool against various cryptosystems and the masking method[10] is known to be one of its algorithmic countermeasures. But it is non-trivial to apply the masking method to non-linear functions, especially, to arithmetic adders. This paper proposes simple and efficient masking methods applicable to arithmetic adders. For this purpose, we use the fact that every combinational logic circuit (including the adders) can be decomposed into basic logic gates (AND, OR, NAND, NOR, XOR, XNOR, NOT) and try to devise efficient masking circuits for these basic gates. The resulting circuits are then applied to the arithmetic adders to get their masking algorithm. As applications, we applied the proposed masking methods to SEED and SHA-1 in hardware. 차분 전력 분석 공격[8]은 암호시스템에 대한 강력한 부채널 공격 방법 중의 하나이며 마스킹 방법[10]은 이러한 차분 전력 분석 공격에 대한 알고리즘적인 대응 기법의 하나로 잘 알려져 있다. 그러나 마스킹 방법을 산술 덧셈기와 같은 비선형 함수에 적용하는 것은 쉽지 않다. 본 논문은 이러한 마스킹 방법을 산술 덧셈기에 효율적으로 적용하는 새로운 방법을 제안한다. 이를 위해서 본 논문은 먼저 기본 논리 게이트 (AND, OR, NAND, NOR, XOR, XNOR, NOT)에 마스킹 방법을 적용하는 방법을 먼저 제안하고 이러한 기본 게이트들의 조합으로 산술 덧셈기를 구성함으로써 산술 덧셈기에 적용 가능한 새로운 마스킹 방법을 제시한다. 제안된 방법의 응용으로서 본 논문은 SEED 블록 암호 알고리즘과 SHA-1 해쉬 함수를 차분 전력 분석 공격에 안전하게 구현하는 방법과 그 상세한 하드웨어적인 구현 결과를 제시한다.

Business-aligned CSR in the United States, Korea, and Japan: Co-word Analysis of CEO Letters

백유진,최순규 한국국제경영관리학회 2019 국제경영리뷰 Vol.23 No.4

This paper analyzes commonalities and differences in business-aligned CSR of the United States, Korea, and Japan through a co-word analysis of CEO letters in sustainability reports. A comparison of the three countries enables us to investigate and empirically validate how competitive and institutional forces shape the conceptualization of business-aligned CSR in different management systems. We find the commonalities exist in word choice between countries as to how business-aligned CSR is conceptualized; business, stakeholder, product, growth, industry, and environment are the universal CSR values in the three countries. We also find the differences in word choice. Commitment, innovation, and efficiency are the keywords found particularly in letters from the CEOs in the United States, whereas competition and competitiveness have high centrality scores only in the Korean context. In the Japanese context, technology, development, production, and needs are more central keywords than in the other countries. In terms of keyword network structures, there are some similarities between the structures of the U.S. and Korean firms, while the Japanese result shows relatively unique features as contrasted with the other two countries. This paper has important implications for the CSR literature by highlighting the importance of strategic and institutional perspectives to understand business-aligned CSR of different countries. Our findings suggest common values in business-aligned CSR among different countries are attributed to corporate concerns about institutional legitimacy at the global level, while differences in CSR may result from national business systems. The results also suggest that the CSR styles of the U.S. and Japanese firms are explicit and implicit, respectively, while Korean CSR is somewhere in between the two extremes.

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.

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

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.

웹 기반 쓰기 평가 기준 개발 연구

백유진 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.16

목적 이 연구의 목적은 웹 기반 쓰기 평가를 위한 평가 기준을 개발하여 쓰기 평가의 타당성과 신뢰성을 제고하는 것이다. 방법 이 연구에서는 웹 기반 쓰기 도구 중에서 활발하게 활용되고 있는 Wiki 도구인 Google Docs 기반의 쓰기 평가를 위한 평가기준을 개발하고자 하였다. 이를 위해 선행 연구 결과와 ‘언어와 매체’ 교과서를 검토하여 웹 기반 쓰기 평가를 위한 평가 요소를추출한 후, 전문가 협의와 중요도 평정을 통해 척도별 응답 비율, 평균, CVR, CVI를 산출하여 내용 타당도를 검증하였다. 이후Two-facet Rasch 분석을 통해 평가 기준의 적합도를 살펴보았다. 결과 첫째, 웹 기반 쓰기 평가를 위한 평가 기준은 총 9개의 평가 기준으로 구성되어 있다. 둘째, 중요도 평정 결과 국어교육 전문가들은 웹 기반 쓰기에서 글씨체와 크기, 프레임, 하이퍼링크와 같은 시각적 스타일보다는 쓰기 목적에 맞게 정보를 제시하는 것을 더중요하게 생각하는 것으로 나타났다. 셋째, 국어교육 전문가들은 각 평가 기준의 중요도에 대해 차별적 인식을 지니고 있는 것으로나타났다. 결론 이 연구에서 개발한 웹 기반 쓰기 평가 기준은 학생들의 웹 기반 쓰기 능력에 대한 정보를 얻고, 웹 기반 쓰기 능력을 신장하기위한 교수학습을 구안하는 데 유용하게 활용될 수 있을 것이다.

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.