• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04a
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• pp.520-524
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• 1995

오늘날 기업이 당면하고 있는 과제는 제품수명이 단축되고, 제품의 종류가 다양화 되면서 단위 제품량이 줄고, 노사분규, 임금인상, 작업환경개선의 요구등 제반문제가 대두되고, 시장성은 더욱 치열해지면서 소비자의 상품에 대한 요구사항이 복잡해지는 경향이 뚜렷하다. 이에따른 생산방식은 얼마나 많은 양을 생산하는가에 촛점을 둔 규모의 경제개념에서 얼마나 다양한 종류의 제품을 효율적으로 생산할 수 있는가에 촛점을 맞춘 범위 의 경제개념으로 전환된 다품종 소량생산체제로 변화하고 있다. 본 연구는 자동차용 Brake system의 Caliper 조립에 있어서 자동화 Line 개발에 성공하여 실용화하고 있는 Line에 대하여 기본적인 구상과 개발기술 및 실용화 결과에 대하여 고찰하였다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.58-59
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• 2003

최근 들어 홀로그래픽 데이터 스토리지의 상용화를 위한 많은 연구가 국내외에서 진행되고 있다. 그런데 성공적인 상용화를 위해서는 개발될 시스템의 가격을 낮추고 기존의 광 메모리와 호환성을 갖추는 것이 중요한 과제로 여겨지고 있다. 이를 달성하기 위한 한 방법으로 비트 단위의 기록 재생 방법을 도입한 holographic ROM System이 제안되었다. 이러한 시스템에서는 일반 DVD나 CD와 거의 유사한 구조를 가지고 있어 저렴하면서도 기존의 광 메모리와도 호환성을 갖는 제품을 만들 수 있을 것으로 예측된다. (중략)

• Review of KIISC
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• v.33 no.4
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• pp.75-81
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• 2023

본 논문에서는 국제전기통신연합(ITU)의 정보통신기술 표준을 담당하고 있는 ITU-T에서 보안 분야표준을 제정하고 있는 SG17에서의 양자암호 표준화 최신 동향을 살펴보았다. ITU-T SG17에서 양자암호 관련 표준화는 실무반인 Q15에서 담당하고 있다. 양자암호통신은 더 이상 쪼갤 수 없는 물리량의 최소 단위인 양자(Quantum)의 특성을 다양한 통신서비스에 적용하여 가장 높은 수준의 보안 서비스를 제공하는 것을 목적으로 하고 있고, 이를 위해 표준화가 필요한 영역에서의 보안 요구 사항과 그와 관련된 상호호환성을 보장하기 위한 다양한 영역의 표준화를 ITU-T SG17 Q15에서 진행 중에 있는데, 해당 실무반의 표준화 연혁과 현재 진행 중인 다양한 표준화 과제의 최신 표준화 현황을 살펴보았다.

• Investigative Magnetic Resonance Imaging
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• v.13 no.2
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• pp.127-136
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• 2009

Purpose : Functional magnetic resonance imaging (fMRI) was used to assess the temporal response of neural activation in healthy subjects while they performed the Iowa Gambling Test (IGT), which utilizes decisions involving ambiguity and risk. The IGT was divided into five blocks of 20 trials; analysis showed that activity in the medial prefrontal cortex (mPFC) moves gradually from the dorsal to the ventral mPFC over the course of the IGT. These findings suggest that cognitive division of the mPFC, including the dorsal portion of the anterior cingulated cortex (ACC), plays a major role in ambiguous decision making and that the aspect of the IGT corresponding to risky decision making is associated with significant activity within the corticolimbic network strongly implicated in emotion and reinforcement. Our results also suggest that decisions made under ambiguity and decisions made under risk situations can be further divided into sub-phases based on the neural network involved.

• The Mathematical Education
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• v.61 no.1
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• pp.1-28
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• 2022

The purpose of this study is to explore how students' fractional knowledge is related to their solving of proportion problems. To this end, 28 clinical interviews with four middle-grade students, each lasting about 30~50 minutes, were carried out from May 2021 to August 2021. The present study focuses on two 7th grade students who exhibited their ability to coordinate three levels of units prior to solving whole number problems. Although the students showed interiorization of three levels of units in solving whole number problems, how they coordinated three levels of units were different in solving proportion problems depending on whether the problems required reasoning with whole numbers or fractions. The students could coordinate three levels of units prior to solving the problems involving whole numbers, they coordinated three levels of units in activity for the problems involving fractions. In particular, the ways the two students employed partitioning operations and how they coordinated quantitative unit structures were different in solving proportion problems involving improper fractions. The study contributes to the field by adding empirical data corroborating the hypotheses that students' ability to transform one three levels of units structure into another one may not only be related to their interiorization of recursive partitioning operations, but it is an important foundation for their construction of splitting operations for composite units.

• Korean Journal of Cognitive Science
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• v.23 no.2
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• pp.225-248
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• 2012

The summed-similarity model of visual short-term recognition proposes that the estimated amount of summed similarity between remembered items and a recognition probe determines recognition judgement decision (Kahan & Sekuler, 2002). This study examined the effect of a task-irrelevant location change on the recognition decision against two remembered Gabor gratings differing in their spatial frequencies. On each trial in Experiment, participants reported if two gratings displayed across the visual fields are the same or not as the probe grating displayed after about a second of memory delay. The probe grating would be the same as or different from the memory items (lure) by 1 or 4 JND units. The location of the probe would also vary randomly across the left and right visual field with respect to the location of the corresponding memory item. The participants were instructed to perform their recognition task exclusively to the spatial frequencies of the memory items and the probe while ignoring the potential location change of the probe. The results showed that false-recognition rates of the lure probe increased as the summed similarity between the memory items and the probe increased. The rates also further increased in the condition where the probe location was different from the location of the corresponding memory item compared to the condition where the probe location was the same. The increased false-recognition rates indicate that information stored into visual short-term memory is represented as a form of well-bound visual features rather than independent features.

• The Journal of Korean Association of Computer Education
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• v.4 no.2
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• pp.31-39
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• 2001

In this paper, we investigate the effects of group composition according to the personality type of learner on the content of discussion in web-based synchronous online discussion. The experiment for this study was conducted with high school students. First, we conducted the MBTI(Myers Briggs Type Indicator) test and based upon the result, we classified learners into 3 groups; introverts group, extroverts group, and introverts/extroverts mixed group. After the online discussion, the content of discussion were analyzed by the units of meaning, based on the four dimensions which were proposed in the 'content analysis model' by Henri(l992). Among four dimensions, 'social' and 'interactive' dimension belonged to category of inter-dependence, and 'cognitive' and 'metacognitive' dimension belonged to category of subject-relevance. The introverts/extroverts mixed group, which was heterogeneously composed, had the most positive effects on the total numbers of the units of meaning, the inter-dependence, and the subject-relevance of the contents of discussion.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1680-1684
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• 2009

The priming task was used in order to provide an experimental evidence on whether the processing unit of Korean syllable is antibody or not. Four types of experimental conditions were made: antibody overlap condition (e.g., sumjil -> sungjik), rime overlap condition (e.g.,: hungchik -> sungjik), onset and coda overlap condition (e.g.,: saengjeok -> sungjik), and no overlap condition (e.g.,: chanmeol -> sungjik). In addition, we manipulated the letter type by type and type in order to investigate on whether different degrees of priming are there for the priming task. The result showed that only type showed significant inhibitory effects. This implicates that certain Korean word would be represented and processed by the antibody unit, and further studies are needed to know the whole pattern of Korean word recognition.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.94-94
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• 2011

본 논문은 "차세대 반도체용 진공공정의 실시간 측정/진단/제어 기술개발"과제의 제 3 세부과제 "스마트형 진공 배기 진단 제어 시스템 개발"의 주요 연구 실적을 소개한다. 본 세부과제는 (1)진공펌프 및 배기 시스템의 다중 상태변수 측정 장치 개발, (2)공정별 펌프 상태 및 공정 조건 data base 구축 및 진단 알고리즘 개발(e-Diagnostics Level 2 FDC 수준), (3)공정별 펌프 상태 변수 측정을 통한 자기 진단 기술 개발(e-Diagnostics Level 2 FDC 수준), 그리고 (4)측정/통신 PMS (Pump Monitoring System) 개발(통신속도 56k bps 이상, e-Diagnostics Level 0~1)을 최종 목표로 추진되어 왔다. 첫 번째 주요실적은 진공배기시스템의 다중 상태변수 측정 및 평가 장치를 성공적으로 개발하였다. 본 장치는 현장에서 진공펌프의 배기속도를 3% 이내로 정밀하게 측정할 수 있는 소닉 노즐을 이용한 배기속도 측정 장치 및 기술을 성공적으로 개발 완료하였다. 그리고 측정 가능한 상태변수는 20종에 달하며 이들을 이용하여 진공펌프의 성능인자 15종과 특성치 9종을 종합적으로 평가할 수 있는 능력을 갖추었다. 두 번째 주요실적은 공정별 진공배기시스템의 자기진단 및 예지보수 기수 개발이다. 연구에서 개발된 적응형 인자모델을 이용한 상태진단 기술은 이미 학회 논문으로 소개되었으며 본 기법은 기존의 시계열 상태변수를 이용한 기존의 상태진단 기법보다 메모리 소요량을 100배로 줄였으며 그리고 연산양은 10% 이하로 줄인 획기적인 기법이라 할 수 있다. 세 번째 주요실적은 상태변수 측정, 통신, 제어 및 공정적응 기능 통합형(smart) PMS(pumper monitoring system) 개발이다. 본 장치는 CAN통신 기법을 새로이 채택하였으며 한 대의 PC로 64대의 단위 진공펌프들의 운전 상태변수를 실시간으로 수집할 수 있도록 하였다. 그리고 운전 중인 개별 진공펌프들의 운전 상태진단은 적응형 인자모델을 이용한 상태진단 기술을 응적용함으로써 매우 정확한 상태진단을 매 batch마다 수행할 수 있는 기능을 제공한다.

• Korean Journal of Heritage: History & Science
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• v.50 no.4
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• pp.222-251
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• 2017

This paper analyzes the characteristics of the ancient tombs discovered in the Gyeongju site and discusses the direction of the excavation. There are six special features of the wooden chamber tomb covered with stone in Gyeongju. First, confirmation of the above-ground type and the underground type burial mound. Second, confirmation of the construction such as the partition of mound and the pile of stone structure. Third, confirmation of the frontal part structure of the protect stone such as pebble-stone layer, boundary stone. Fourth, confirmation of the relationship before and after the mound. Fifth, the circumference and boundary of the confirmed(before 1990s) burial mounds were discovered, resolving the uncertainty. Sixth confirmation of the crowd unit tombs. By summing up these six features, it is possible to clearly divide the individual units and the crowd units of the Silla tombs. Confirmation of individual units and crowd units can clarify the size and scope of the tombs located by the concatenation and overlap. It is possible to get a glimpse of the formation process through the interrelationships between the two sides. The tombs are located in the upper-and-lower layer structure of the tombs and show selective site selection. When this formative process is rearranged, it is understood that the Gyeongju Silla Cemetery is formed through the course of four stages. It is anticipated that it will be possible to make selective projects in the excavation survey based on the confirmation of the individual unit and the crowd unit of the Silla ancient tombs and the formation process.