• 한국정보과학회논문지:시스템및이론
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• 제35권9_10호
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• pp.485-496
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• 2008

SoC(System-on-Chip)를 설계함에 있어서 칩의 복잡도 증가로 인하여, RTL(Register Transfer Level)에 기반한 기존의 시스템 성능 분석 및 검증 기법만으로는 점차 짧아지는 '시장 적기 출하(time-to-market)' 요구에 효율적으로 대응할 수 없게 되었다. 이를 극복하기 위하여 설계 포기 단계부터 지속적으로 시스템을 검증하기 위한 새로운 설계 방법이 요구되었으며, TLM(Transaction Level Modeling) 추상화 수준을 가진 하드웨어-소프트웨어(HW-SW) 통합 시뮬레이션이 이러한 문제를 해결하기 위한 방법으로 널리 연구되고 있다. 그러나 대부분의 HW-SW 통합 시뮬레이터들은 다양한 추상화 수준 중 일부만을 지원하고 있으며, 서로 다른 추상화 수준을 지원하는 툴들 간의 연계도 쉽지 않다. 이를 극복하기 위하여 본 논문에서는 HW-SW 통합 시뮬레이션을 위한 다목적 선계 프레임워크를 제안한다. 제안하는 프레임워크는 소프트웨어 응용의 설계를 포함하는 체계적인 SoC 설계 플로우를 제공하며, 각 설계 단계에서 다양한 기법들을 유연하게 적용할 수 있는 동시에, 다양한 HW-SW 통합 시뮬레이터들을 지원한다. 또한 플랫폼을 추상화 수준과 모델링 언어에 독립적으로 설계할 수 있어, 다양한 수준의 시뮬레이션 모델 생성이 가능하다. 본 논문에서는 실험을 통하여, 제안하는 프레임워크가 ARM9 기반의 강용 SoC 플랫폼을 정확하게 모델링 할 수 있는 동시에, MJPEG 예제의 성능을 44%까지 향상시키는 성능 최적화를 수행할 수 있음을 검증하였다.

• 영재교육연구
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• 제25권6호
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• pp.799-815
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• 2015

우리나라 영재교육은 영재교육진흥법이 제정된 이 후 최근 10여 년 동안 많은 성장을 이루었으나 영재교육 프로그램의 질적인 측면에서 많은 문제점들이 나타나고 있다. 이에 본 연구는 영재교육 프로그램 운영상의 문제점과 국가표준 영재교육 프로그램 기준 마련에 대한 영재교사들의 인식을 조사하였으며 연구결과에 따른 결론은 다음과 같았다. 첫째, 교수-학습 자료 부족과 지역별 영재아동들의 수준 차이, 학년 및 학교급간 프로그램의 중복성을 영재교육 프로그램 운영에 있어 문제점으로 인식하고 있는 것으로 분석되었다. 둘째, 대부분의 영재교사들은 국가표준 영재교육 프로그램 기준 개발의 필요성에 매우 긍정적으로 인식하고 있는 것으로 나타났다. 또한 국가표준 영재교육 프로그램 기준이 마련되면 중복되었던 교육 내용 및 방법이 차별성 있게 운영될 수 있고, 프로그램 주제 선정에 대한 어려움이 해소될 수 있으며, 다양한 측면의 영재교육 프로그램 확보로 영재교육의 질적 수준이 높아 질 것으로 기대하는 것으로 나타났다. 특히 초 중 고의 영재교육 연계성 부족의 문제가 해결 될 것으로 기대하는 것으로 분석되었다. 따라서 학교급별 영재교육 내용의 중복성과 연계성 부족의 문제를 해결하여 영재교육의 질적 수준을 높일 수 있도록 국가표준 영재교육 프로그램 기준이 조속히 개발되어야 할 것이다.

• 한국기계가공학회지
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• 제14권2호
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• pp.105-111
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• 2015

Car manufacturers and part manufacturers each have their own criteria with regard to strength, stiffness and NVH performance levels. Part manufacturers typically investigate such performances according to the part unit. To do this, the part manufacturer receives information from the relevant car maker. However, the information provided by the car maker is limited, making it difficult to develop a part which meets all of the design requirements specified by the car unit overall. To overcome this difficulty, the utilization of a VPG system is recommended for the designer. In this study, the durability performance of an optimized control arm as suggested in a previous study was investigated using the ETA-VPG, LS-dyna and FE/safe software packages. ETA-VPG provides several types of suspension and steering parts. In this study, a complete car is created using the library included in ETA-VPG, with the exception of the control arm. We also conducted a virtual proving ground analysis to predict the life cycle of the control arm.

• 정보교육학회논문지
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• 제15권3호
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• pp.505-515
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• 2011

교육과학기술부가 원격교원연수원을 2000년 12월부터 지정 인가해 주기 시작한 이래로 지속된 교원 원격연수의 양적 성장에도 불구하고, 연수시간 확보의 어려움, 통신 인프라 문제, 교수자와 학습자간 상호작용의 어려움, 온라인 평가의 공정성 문제, 콘텐츠 갱신의 어려움, 연수생 관리의 어려움 등으로 인해 기대만큼 고품질의 원격연수가 운영되지는 못했다. 이에 본 연구에서는 교원능력개발평가와 연계하여 교원 원격연수의 발전방향을 제시하기 위한 일환으로 16개 시 도 교육연수원에서 분담 개발한 교원능력개발 원격연수 콘텐츠의 시범연수에 참여한 연수생 및 연수운영자의 원격연수에 대한 만족도와 건의사항, 연수시스템의 활용 숙련 수준을 조사하고 분석하였다.

• 한국수학교육학회지시리즈A:수학교육
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• 제41권3호
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• pp.233-256
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• 2002

This study investigated school mathematics curriculum of England, newly revised in 1998, focused on the 'number and algebra' domain among three major domains of the English curriculum. On the basis of its understanding, this domain was compared and analyzed with school mathematics curriculum of Korea. In doing so, this study explored its plans and procedures and established a frame of comparison for the curriculums between the two countries. The structure of the National Curriculum in England is composed of programmes of study and attainment targets. The former sets out what should be taught in mathematics at key stages 1, 2, 3, and 4 and provides the basis for planning schemes of work, and the latter sets out the knowledge, skills, and understanding that pupils of different abilities and matures are expected to have by the end of each key stage. Attainment targets are composed of eight levels and an additional level of increasing difficulty. According to the results of the present study, Korea focuses on the formal and systematic mathematical knowledge on the basis of sound understanding of certain mathematical terms or concepts. On the other hand, England tends to deal with numbers more flexibly and naturally through the aquisition of mental methods, calculator use methods, etc, and emphasizes that mathematics be realistic and useful in solving a diverse number of problems confronted in everyday life.

• 영재교육연구
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• 제3_4권1호
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• pp.158-166
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• 1994

The nature of the classroom environment is an important variable to understand when fostering creativity for elementary children. Studies of the classroom climate, structure or interaction commonly depend on behavioral observations or reports from the teacher or other adult-observer. Recent studies have used self-report instruments completed by students regarding their perceptions of various aspects of their class (see Fraser, 1991). The purpose of this study was to determine the developmental differences in the ratings of classroom environment between Korean students who are gifted and their American peers. The My Class Inventory was administered to 141 elementary students in grades three, four, and five. There were 65 Korean students and 76 American students who were identified as gifted by their schools. Reliability coefficients were calculated for all scales (satisfaction = .68: friction, .67; competition = .57; cohesion = .73; difficulty = .22). Results of a multivariate analysis illustrated significant differences between students from Korea and students from America on the MCI. Univariate analysis of variance of cultural group by grade level were conducted for four of the five scales. Significant differences were found by country for the cohesion scale and by country at grade levels for the satisfaction scale. American children expressed greater satisfaction than their Korean counterparts at all grade level, but particularly at grade five. Implications for further research are discussed.

• 한국IT서비스학회지
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• 제13권4호
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• pp.231-243
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• 2014

Of the various data that corporations can approach, web log data are important data that correspond to data analysis to implement customer relations management strategies. As the volume of approachable data has increased exponentially due to the Internet and popularization of smart phone, web log data have also increased a lot. As a result, it has become difficult to expand storage to process large amounts of web logs data flexibly and extremely hard to implement a system capable of categorizing, analyzing, and processing web log data accumulated over a long period of time. This study thus set out to apply Hadoop, a distributed processing system that had recently come into the spotlight for its capacity of processing large volumes of data, and propose an efficient analysis plan for large amounts of web log. The study checked the forms of web log by the effective web log collection methods and the web log levels by using Hadoop and proposed analysis techniques and Hadoop organization designs accordingly. The present study resolved the difficulty with processing large amounts of web log data and proposed the activity patterns of users through web log analysis, thus demonstrating its advantages as a new means of marketing.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2004년도 제21차 정기총회 및 학술발표회
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• pp.53-68
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• 2004

Eggshell quality is one of the most important factors that influence hatchability. The porosity and overall quality of eggshell have a very significant effect on exchange of vital gas (carbon dioxide and oxygen) between the developing embryo and the air during incubation. Thin-shelled eggs showed the greater weight loss than do thick-shelled eggs. causing the chick to have difficulty in hatching. Thin-shelled eggs also have a much greater chance of being cracked during handling. On the other hand. thick-shelled eggs showed the higher hatchability as a result of greater fertility and lower intermediate and late embryonic mortalities. Even a small percentage improvement in the eggshell quality could result in significant saving to the breeder industry in an increasingly competitive environment. Many factors including nutrition. management practices, environmental conditions and breeding are known to be related to eggshell quality. In this review brief accounts of each factor associated with eggshell quality and hatchability were provided. We conducted three experiments to investigate the effects of dietary Ca. vitamin D3 metabolite and some bioactive materials on eggshell quality and hatching egg production. The results of our studies showed that relatively high levels of dietary Ca in combination with 25-hydroxycholecalciferol had beneficial effects on improving eggshell quality and reproductive performances in aged egg-type breeder hens. It was also suggested that the proper use of some feed additives such as isoflavon and chitosan might provide means of improving eggshell quality and reproductive performances in aged egg-type breeder hens.

• 한국음향학회지
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• 제13권6호
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• pp.66-74
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• 1994

잔향음이 우세한 환경하에서 소나 시스템의 성능을 평가할 때 대부분의 음향 모델인 음압 준위(power level) 모델에 비해 수중 잔향음 신호 모의 모델은 매우 유용하게 이용된다. 본 논문에서는 소나 시험에 필요한 잔향음 신호(reverberation time series)를 모의하였다. 우선 주파수 영역에서 밴드의 폭이 변하고 가우시안 분포(Gaussian distribution)를 갖는 표준화된 스펙트럼(normalized spectrum)을 수신 시간 간격에 따라 구하였다. 두번째로, 기존의 음향 모델의 결과인 시간에 따른 잔향음 준위를 각각의 표준화된 스펙트럼의 준위와 합성하였다. 마지막으로 음원 신호의 스펙트럼과 잔향음 스펙트럼을 곱(product)하고 이 결과를 역푸리에 변환(inverse Fourier transform)을 이용하여 신호를 모의하였다.

• 한국안전학회지
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• 제23권1호
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• pp.46-50
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• 2008

The purpose of the present study was to investigate the mariner's information characteristics in ship-ta-ship collision situation using the full mission ship-handling simulator. Risk levels of ship-to-ship collision were manipulated by whether the target ship complies with the naval regulations and by movement patterns of target ship. Dependent variables reflecting mariner's information characteristics in ship-ta-ship collision situation were measured in terms of radar detection reaction time, free recall performance of past navigation situation, and subjective ratings for the task difficulty. The results showed that, in general, the mariners appeared to be deteriorated in their radar detection reaction time and free recall performance as the risk of ship-ta-ship collision increased. Also, the mariners tended to rate required tasks more difficult in the high risk ship-ta-ship collision situation.