• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.6
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• pp.493-503
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• 2018

The present study is a conceptual replication of O'Grady, Lee, and Choo's (2003) earlier study designed to investigate two hypotheses (linear distance hypothesis vs. structural distance hypothesis) in relation to L2 Korean learners' processing of Korean subject and object relative clauses (RCs) in a scholarly attempt to explicate Keenan and Comrie's (1977) Noun Phrase Accessibility Hierarchy (NPAH). In addition, the current study is intended to explore any potential role of working memory capacity (WMC) in the processing of Korean subject and/or object RCs. Chinese-speaking learners of Korean taking a language course offered at a local university in Korea participated in this experimental study. Among those recruited, only 23 learners completed the experimental tasks appropriately according to the specific instructions provided on each task, and thus, subsequent statistical analyses were conducted on their data. Fifteen Korean NSs were also recruited for the control group. Two experimental tasks were administerd to the participants: one picture selection task containing the same test items used in O'Grady et al.'s study to measure their processing of subject-object RCs and an operation span (OSPAN) task to measure their WMC. Somewhat differently from O'Grady et al.'s findings, the participating Chinese learners of Korean performed significantly better on object RCs than on subject RCs, seemingly lending support to the linear distance hypothesis. Further analyses, however, suggested that the results in favor of, or relative ease of processing, object relative clauses were due, most likely, to the learners' excessive use of the canonical sentence strategy, which also led to nonsignificant correlations between WMC and learner performance on the picture selection task.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.1D
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• pp.65-72
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• 2011

When an expressway intersects another expressway, a unique connector needs to be designed between the two consecutive exit ramps. In such a case, it is important to design a connector such that there is enough distance for drivers to find their way safely. A current design manual in Korea prescribes the minimum length of the connector as 240 m. In this research, we have suggested a method for calculating the minimum length of a connector in order to check the feasibility of the currently prescribed length. For this purpose, we have attempted to determine the total perception-reaction time and lane-changing time required by a driver. For determining the driver's perception-reaction time, we have used the driver's decision time in addition to the conventional 2.5 s of perception-reaction time for stopping sight distances. We have considered both the design speed and the average travel speed for the calculation of the length. To evaluate the accuracy of the new method, we have chosen four sites on expressways for which relatively high accident rates were recorded. As a result, we could verify that the current limit (240 m) was sufficient for drivers to be able to change lanes in the given specific geometry. However, the prescribed limit should be revised in case the drivers' decision time is considered to be their perception-reaction time. All new approaches for calculating the ideal length of a connector have been carried out by taking into account the design speed as well as the average travel speed. Owing to the characteristics of the specific geometry for two consecutive exit ramps and the large difference between the design speed and the average travel speed in the objective areas, it is more realistic to use the proposed method by keeping the decision time equal to a driver's perception-reaction time, in order to determine the ideal distance that should be maintained between two consecutive exit ramps.

• Korean Journal of Cognitive Science
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• v.10 no.3
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• pp.17-28
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• 1999

Systematic distortions in perceived 3-D shape were obtained for elliptical and parabolic stereoscopic surfaces viewed at different distances under full and reduced cue conditions. In both conditions of Experiments 1 and 3, elliptical hemi-cylinders a appeared near veridical at the 45 cm viewing distances and flattened up to 74% of veridical at 135 cm. In Experiment 2, under full cue conditions, parabolic hemi-cylinders a appeared stretched to 118% of veridical at 45 cm, near veridical at 90 cm, and flattened to 85% of veridical at 135 cm. Under reduced cue conditions parabolas appeared flatter overall: veridical curvature was obtained at 45 cm viewing distance with flatness increasing to 68% of veridical at 135 cm. Results support a scaling explanation of perceived 3-D shape from disparity and rule out the alternative hypothesis that disparity curvature, an optical invariant, provides information for the direct perception of 3-D s shape.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.526-528
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• 2001

기존의 얼굴표정 인식연구의 대부분은 얼굴영상에서 사전정보 획득과, 인식이 각각 별개로 수행되어, 전자의 결과가 후자를 보장하지 못하거나, 데이터와 계산 양의 과다, 그리고 인지과정이 사람과 다르다는 등의 문제가 있다. 이에 대해 하우스도르프 거리 매칭을 적용, 표정인식을 시도한다. 이는 전체적인 유사도를 측정하는 방법으로서 전체이론(Holistic theory)에 기반하여, '사람의 인지과정'을 따른다. 그러나 축소된 데이터를 사용하므로, 이 방법의 인식결과가 부족할 경우, 영상워핑을 적용하여 Brennan과 Carton이 제안한 캐리커쳐 효과를 이용한다. 이는 영상을 적절히 변형, 표정의 특징을 과장하고 잡영을 제거하여, 인식하기 쉬운, 분명한 표정을 생성하는 방법이다. 위 과정을 통해, 사람의 인지과정을 모사하고, 최소한의 데이터로써 사전정보 획득과정이 생략된, 입력영상으로부터 직접 표정을 인식하는 방법을 제안한다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.154-155
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• 2000

인간이 인지하는 디스플레이 화질은 디스플레이 및 시각계의 시간적·공간적 특성에 의해 결정되어진다고 한다. 이때, 시각계의 공간 특성은 공간적 콘트라스트 감도 함수(Spatial Contrast Sensitivity Function, 공간적 CSF, 이하 CSF로 표기)로 나타낼 수 있다. 일반적으로 디스플레이를 이용한 휘도 격자의 CSF는 휘도 및 시청 거리(디스플레이와 피험자간 거리)에 의한 영향을 받는다. 본 논문의 목적은 이러한 CSF의 기본 특성에 대해 검토하고, 향후 이를 디스플레이의 화질평가 척도에 이용하는 것에 있다. (중략)

• Journal of Satellite, Information and Communications
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• v.10 no.3
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• pp.6-10
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• 2015

RF energy harvesting technology is a promising technology for generating the electrical power from ambient RF signal to operate low-power consumption devices(eg. sensor) in wireless communication networks. This paper, motivated by this and building upon existing CR(Cognitive Radio) network model, proposes a optimal control policy for RF energy harvesting CR networks model where secondary users that have low power consumption harvest ambient RF energy from transmission by nearby active primary users, while periodically sensing and opportunistically accessing the licensed spectrum to the primary user's network. We consider that primary users and secondary users are distributed as Poisson point processes and contact with their intended receivers at fixed distances. Finally we can derive the optimal frame duration, transmission power and density of secondary user from the proposed model that can maximize the secondary users's throughput under the given several conditions and suggest future directions of research.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.30 no.6
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• pp.501-506
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• 2017

An infrared seeking missile does not emit any signal by itself as it is guided by passive heat signature from an aircraft. Therefore, it is difficult for the target aircraft to notice the existence of incoming missile, making it a serious threat. The usage of MAW(missile approach warning) that can notify the approaching infrared seeking missile is currently limited due to its high cost. Furthermore, effectiveness of MAW against infrared seeking missile is not available in open literature. Therefore, effect of evasive maneuver by MAW on the survivability of the aircraft is simulated to evaluate the benefit of the MAW in this research. The lethal range is used as a measure of aircraft survivability. An aircraft flying at an altitude of 5km with Mach 0.9 being tracked by air-launched AIM-9 infrared seeking missile is considered in this research. As a variable for the evasive maneuver, the MAW recognition distance of 5~7km and the G-force of 3~7G that limits maximum directional change of the aircraft are considered. Simulation results showed that the recognition of incoming missile by MAW and following evasive maneuver can reduce the lethal range considerably. Maximum reduction in lethal range is found to be 29.4%. Also, the MAW recognition distance have a greater importance than the aircraft maneuverability that is limited by structural limit of the aircraft.

• 건강소식
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• v.29 no.4 s.317
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• pp.6-9
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• 2005

치매라는 말은 Dement라는 라틴어에서 유래된 것으로써 '정상적인 마음과는 거리가 멀어진것', '정신이 없어진 것'이라는 의미를 지니고 있다. 치매는 나이가 들어감에 따라 정상적으로 발달한 뇌가 후천적인 외상이나 질병 등 외부적인 요인에 의해 손상되거나 파괴되어 언어ㆍ학습ㆍ지능 등에 대한 전반적인 인지기능과 고등정신기능이 비정상적으로 감퇴되는 복합적인 임상증후군을 포괄적으로 이르는 것을 말한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.2
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• pp.133-140
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• 2020

We discuss the method of a high precision range trigger and generation for a high range resolution radar. To verify the designed range resolution performance, we use test-equipments which can absolutely make a precision range shorter than the desined range resolution. The accuracy of generated range is proportional to the system reference clock. However, the system main processor is limited to input reference clocks and a higher available one is expensive in the conventional method. To solve this problem, we proposed that the range trigger and generation method using multi-phase-shiftings and integration. Through a experiment, we verified that the proposed method made problems which can be ocurred in the conventional method clear.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.393-399
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• 2006

음악을 들을 때 사람이 인지할 수 있는 긴장감을 뜻하는 텐션(tension)은 조성음악의 기본을 이루는 중요한 요소이다. 본 논문에서는 임의의 곡의 텐션의 움직임을 B-스플라인 곡선을 이용하여 표현하고 이 곡선을 수정하여 음악의 긴장도를 조정할 수 있는 방법을 제안한다. 먼저, 우리는 음악에서 사용되는 다양한 코드들의 긴장도를 측정하는 방법세 가지를 제안한다. 첫 번째는 러달이 제시한 5도권 기반의 코드 거리 측정방식을 개량한 것이며, 두 번째는 츄가 제시한 나선형 모델의 거리 측정 방식을 응용한 것이며, 세 번째는 크럼한슬이 제시한 특정한 조성에서 각 구성 음들의 안정도와 구성 음들 사이의 음정의 조화성을 이용한 방법이다. 이 방법들을 이용하여 우리는 음악이 지니고 있는 긴장도를 수치적으로 나타낼 수 있다. 다음으로 B-스플라인 곡선을 이용하여 전체 곡의 텐션의 움직임을 표현한다. B-스플라인 곡선으로 표현된 텐션 곡선은 수정이 가해져 원곡의 긴장도를 변화시키는데 사용될 수 있다. 본 논문에서는 텐션 곡선의 높이를 이용하여 곡 전체의 긴장도를 변화시키는 방법과 스페이스-타임 최적화를 사용하여 특정 부분의 긴장도를 변화시키는 방법을 제안한다. 또한 B-스플라인 곡선을 통하여 새로운 코드 진행을 얻을 수 있는 방법을 소개한다. 게임이나 영화, 애니메이션에서 긴장되는 장면을 연출할 때 긴장감 있는 음악의 사용은 필수적인 요소이다. 본 논문에서 제안하는 방법을 통하여 음악의 긴장도라는 인지적인 요소를 B-스플라인 곡선이라는 수치적인 형태로 표현함으로써, 우리는 실시간으로 음악의 긴장도를 자동적으로 변화시킬 수 있다. 따라서 본 논문에서 제안하는 방법은 게임 같은 인터렉티브한 환경에서 사용자의 몰입성을 증가시키는 방법으로 특히 효과적으로 사용될 수 있다.