• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.3
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• pp.203-208
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• 2017

Recently, the importance of DRAM is very significant in multicore processors which are widely used in computers, laptops, tablet PCs, and mobile devices. To keep up with this, both industry and academia have actively studied various types of future DRAMs. Therefore, accurate DRAM model is requisite when evaluating the multicore processor performance. In this paper, a multicore processor trace-driven simulator which can couple with the cycle-accurate DRAM simulator has been developed. Using SPEC 2000 benchmarks as input, the effect of cycle-accurate DDR3 model on the multicore processor performance has been evaluated.

• Journal of the Korean Society of Food Culture
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• v.4 no.3
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• pp.311-318
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• 1989

우리 민족(民族)의 희노애락(喜怒哀樂)과 함께 흘러온 민속주(民俗酒)는 우리의 문화(文化)와 더불어 발전(發展)되어 왔었다. 그러나 일본(日本)의 지배(支配)를 받게된 이후(以後)에는 대부분의 민속주(民俗酒)는 밀주(密酒)로 규정(規定)되어 주조(酒造)가 금지되어 왔으며 해방후(解放後)에도 한국정부(韓國政府)의 양곡정책(糧穀政策)으로 인하여 특히 1961년(年) 이후(以後)에는 쌀을 사용하는 민속주(民俗酒)는 강력(强力)하게 금지(禁止)되었고 민속주(民俗酒)에 관(關)한 문화(文化)는 거의 자취를 감추게 되어 왔었다. 그런데 다행(多幸)히도 1985년(年)에 문공부(文公部)에서 민속주(民俗酒)의 주조(酒造) 기술(技術)을 가진 많은 기능인(機能人)을 문화재보호(文化財保護)의 차원(次元)에서 발굴(發掘)하였고 그 기능(機能)을 보존(保存) 계승(繼承)하도록 노력하였다. 따라서 정부(政府)에서는 1988년(年) 9월(月) 전통(傳統)과 기술(技術)이 인정(認定)되는 24종(種)이 민속주(民俗酒)를 민간인(民間人)에게 주조(酒造)할 수 있도록 예비(豫備) 가능(可能)한 바 있었다. 그 24종(種)의 민속주(民俗酒) 중(中)에서 한산(韓山) 소곡주(素穀酒), 경주(慶州) 법주(法酒), 천(川) 박시주(朴?酒), 안동(安東) 소주(燒酒), 이리 이강주(梨薑酒)에 관(關)하여 그 유래(由來), 특징(特徵), 전승(傳承)의 근원, 제조현황(製造現況) 그리고 전래(傳來)된 일화(逸話) 등을 조사(調査) 수록(收錄)하였다.

• Korean Journal of Optics and Photonics
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• v.25 no.3
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• pp.150-154
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• 2014

The conditions under which a composite retarder consisting of two different retardation plates can be operated as a tunable quarter-wave plate are derived. The explicit expressions for the azimuthal angle of a linear polarizer and those of two retardation plates to generate circularly polarized light are presented as a function of retardation angles. Those expressions for the azimuthal angles derived using the Jones matrix formalism are verified as identical to the expressions derived from the analysis of the trajectory on a Poincar$\acute{e}$ sphere. A couple of examples are presented for generating circularly polarized light when two identical retardation plates are used.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.2
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• pp.251-256
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• 2017

Recently, multicore processor system is widely adopted not only in general purpose computers but also in embedded systems and mobile devices in order to improve performance. Since the power dissipation issue of multicore processor system is very significant, it must be estimated accurately in the early design stage. In this paper, a fast power analysis tool for a high performance multicore processor based on the trace-driven simulator has been developed. To achieve it, the power dissipation of each hardware unit per core are added. Using SPEC 2000 benchmarks as input, the trace-driven simulation has been performed to estimate the average power dissipation per instruction.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.169-175
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• 2018

Recently, power dissipation issue is very significant not only in high-end modern processors but also in embedded systems and mobile devices. Based on the power dissipation, hardware and software designers can correctly find the power/performance tradeoffs. Most power analysis tools calculate power dissipation when chip layout or floor planning are finished. In this paper, a trace-driven simulator that can interact with power analysis tool for an embedded microprocessor has been developed. Using MiBench embedded benchmarks as input, the trace-driven simulation has been performed to estimate the average power dissipation which is faster than the conventional tools.

• The Journal of Korean Academic Society of Nursing Education
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• v.17 no.2
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• pp.306-316
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• 2011

Purpose: The purpose of this study was to compare health promotion lifestyles of college nursing students between students who live with their parents and students who are self-boarders. Methods: The sample consisted of 375 college nursing students in C and S city. Self report questionnaires were used to measure the variables. In data analysis, the SPSSWIN 18.0 program was utilized for descriptive statistics, Pearson's correlation coefficients, and multiple regression analysis. Results: The mean score for Health Promotion Lifestyle in living with the parents group was significantly higher than that of the self-boarders group (t=-2.16, p=.031). In multiple regression, perceived health state, exercise frequency, self-rated knowledge about health, and grade were significant predictors of Health Promotion Lifestyle in college nursing students, explaining 26.3%. Conclusion: This study suggests that perceived health state, exercise frequency, and self-rated knowledge about health, and grade are significant influencing factors in Health Promotion Lifestyle in college nursing students. Therefore, strategies which improve these variables must be developed for college nursing students.

• Journal of Korean Home Economics Education Association
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• v.8 no.1
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• pp.11-21
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• 1996

The purpose of this study was to investigate the knowledge on nutrition, meal management and dietary intake of self-boarding highschool students. Total of 354 self-boarding students living in Ku-mi and Kim-chon, 182 males and 172 females, who cooks foods for oneself participated in this study. The data were collected through questionnaires and the results were summarized as follows： 1. Most subjects had adapted the lifestyle of self-boarding from the 1st grade of highschool, and half of them lived alone. About two-thirds of subjects visited their home once a week or more, and most of their boarding rooms were located at near the highschool they attended. 2. Their nutrition knowledge score was rather high with average 13.95 point out of possible 20. Female students got more points than male students. 3. In meal management, foods purchasing and sanitary control were managed quite well but meal planning and cooking were not managed well enough. In general, meal management score of female students were higher than those of male students. 4. About the dietary intake, female students took more various foods than male students as judged by foods intake frequency score. Two-thirds of subjects often skipped meals and only half of them always took boxed lunch. Also they depended too much upon processed and instant foods. 5. Meal management score showed significantly positive correlations with nutrition knowledge score and with foods intake frequency score. But the correlation between nutrition knowledge score and foods intake frequency score was not significant.

• Journal for History of Mathematics
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• v.25 no.4
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• pp.83-99
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• 2012

The conic sections are defined as algebraic expressions using the focus and the directrix in the high school curriculum. However it is difficult that students understand the conic sections without environment which they can manipulate the conic sections. To make up for this weak point, we have found the evidence for generating method of a conic section through a sundial and investigated the history of terms 'focus', 'directrix' and the tool of drawing them continuously.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.101-104
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• 2001

데이터베이스에서 트랜잭션의 처리량을 향상시키기 위해서 기존의 문법 위주의 직렬성 이론으로는 단위시간당 처리량을 높이기는 힘든 형편이다. 이를 위하여 이타적 잠금 기법(altruistic locking: AL)은 트랜잭션이 객체를 사용한 다음 더 이상 그 객체를 요구하지 않을 때 다른 트랜잭션들이 그 객체를 로크할 수 있도록 미리 객체에 대한 로크를 해제함으로써 트랜잭션들의 대기시간을 줄이고 처리량을 향상시키기 위한 취지에서 제안된 것이다. 확장형 이타적 잠금(extended altruistic locking: XAL)기법은 AL 을 자취의 확장한 것으로 AL 이 근본적으로 안고 있는 반드시 기부된 객체만을 처리해야 한다는 제약을 완화한 기법이다. 본 논문에서는 분산 데이터베이스 환경하에서 장기 트랜잭션으로 인한 단기 트랜잭션의 대기현상을 최소화하도록 함으로써 동시성 제어의 정도를 높일 수 있는 새로운 확장형 이타적 잠금 기법인 양방향 기부기법(two-way donation locking: 2DL)을 제안하고 기존의 제어기법과 비교하였다. 모의실험에 의한 성능평가 결과 2DL 은 작업 처리율과 트랜잭션의 평균 대기시간 면에서 우수한 결과를 나타내었다.

• Communications of Mathematical Education
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• v.37 no.3
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• pp.483-495
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• 2023

In his book "Exercitationum Mathematicalarum," a 17th-century mathematician van Schooten proposed linkages for drawing parabola, ellipse, and hyperbola. The linkages proposed by van Schooten can be used in action-based mathematics education and as a material for using mathematical history in school mathematics. In particular, students are not provided with the opportunity to learn by manipulating the quadratic curves in the high school curriculum, so van Schooten's linkages can be used for school mathematics. To this end, a method of implementing van Schooten's linkage in a dynamic geometry environment was presented, and proved that the traces of the figure drawn using van Schooten's linkage were parabola, ellipse, and hyperbola.