• 드라이브 ㆍ 컨트롤
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• 제17권4호
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• pp.72-79
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• 2020

To ensure the safety of Advanced Driver Assistance Systems (ADAS) or autonomous vehicles, it is important to recognize the vehicle position, and specifically, the increased accuracy of the lateral position of the vehicle is required. In recent years, the quality of GPS signals has improved a lot and the price has decreased significantly, but extreme urban environments such as tunnels still pose a critical challenge. In this study, we proposed stable and precise lane recognition and tracking methods to solve these two issues via fusion of AVM images and vehicle sensor data using an extended Kalman filter. In addition, the vehicle's lateral position recognition and the abnormal state of RTK GPS were determined using this approach. The proposed method was validated via actual vehicle experiments in urban areas reporting multipath and signal disconnections.

• 반도체디스플레이기술학회지
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• 제15권3호
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• pp.1-5
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• 2016

In order to apply sub-resolution assist feature (SRAF) in extreme ultraviolet lithography, the maximum non-printing SRAF width and lithography process margin needs to be improved. Through simulation, we confirmed that the maximum SRAF width of 6% attenuated phase shift mask (PSM) is large compared to conventional binary intensity mask. The increase in SRAF width is due to dark region's reflectivity of PSM which consequently improves the process window. Furthermore, the critical dimension error caused by variation of SRAF width and center position is reduced by lower change in diffraction amplitude. Therefore, we speculate that the margin of SRAF application will be improved by using PSM.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 춘계학술대회논문집
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• pp.204-209
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• 2003

Cam mechanisms are one of the most popular devices for generating intermittent motion and are widely used in many areas. Also, as being interested in research of precision field, cam mechanism is required high accuracy and continuity, In. In this paper, the cam mechanism of filament automatic assembly machine design for precision motion is proposed. The modelling of a cam mechanism, cam profile functions, and the design of the cam considering the precision positioning of the cam mechanism is studied. And, simulation of designed cam mechanism had been carried out dynamic analysis.

• 한국연극학
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• 제48호
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• pp.85-125
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• 2012

Geun Hyung Park is one of the playwrights who consistently pursues his unique world of play. One of the characteristics that is constantly discovered in Park's plays is the motif of 'family.' Park chooses family as the motif in most of his work. Park particularly emphasizes 'family life' rather than 'individual life' to focus on the internal problems of families. Therefore, the motif of family in Park's plays takes a very important position in the content and theme. The Korean society imposes unique value on families and possesses a strictly obstinate family ideology. Park observes distorted family relations or individuals who cannot be happy within their families to identify the problems related to the family ideology that is deeply rooted in the Korean society. This is one of the important backgrounds for which Park is constantly dealing with 'family life.' This study selected five of Park's most famous plays to specifically examine Park's critical understanding of family ideology. First, his criticizes extreme family egoism by depicting a family that cannibalizes people to keep the family full. Park chooses 'absurd time and space' and the extreme subject of 'human flesh' to warn his audiences about the awful consequences of family egoism. His , which is the only piece that deals with family history among the five pieces selected, criticizes Korea's unique family-centered ideology by humorously depicting the history of the Cho family that is all about maintaining and worshipping the its clan. He reveals the unethical and hypocritical attitudes of the Cho family for the audiences to reconsider the family-centered ideology of the Korean society. In , he talks about the son and the father who lose his ethical authority and fail to perform his paternal responsibilities to criticize the traditional family ideology of patriarchism and suggests the pessimistic future of patriarchism. contrasts a blood-related family with an irresponsible father and a quasi-family to criticize the identity of blood-related families. In , Park depicts a 'smelly house' of a family in agonizing relations to deny the family myth and the maternal myth. He clearly shows how the ideals of family myth and maternal myth are distant from the reality. In result of this study, Park's criticism of family ideology appears in various forms. He comprehensively criticizes both the general family problems and the unique family issues of Korea. The family ideology of Korea is currently undergoing a radical change. It has been long since the traditional family ideologies have exposed problems to show the signs of crisis. Also, there have emerged various forms of families, including single-parent families, one-person families, adoption families, and multi-cultural families. In this respect, Park's critical understanding of family ideologies allows you to see the obvious family forms from a new perspective and greatly contributes to awakening the essential questions about families. Park's work is noticeable among the various artistic and literature pieces that deal with family issues because of his extraordinary skills to capture the key issues inherent in the problems of family ideologies.

• 한국전기전자재료학회논문지
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• 제31권4호
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• pp.193-197
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• 2018

The ratio of the period of a diffractive element to the input beam size is a critical parameter in a diffractive beam shaper. We measured and calculated the Fraunhofer diffraction patterns of a periodic hologram with an input beam size similar to the period of the hologram. The measured intensities show very complicated patterns and are strongly dependent upon the center position of the laser beam relative to the hologram. Using a diffraction formula for a periodic hologram, we calculated the diffracted light intensities and fit them to the measured ones. The measured and calculated intensities are in good agreement even when the beam diameter of the incident laser is similar to the period of the hologram. We can therefore use this formula to estimate the output of a periodic beam shaper even under such an extreme condition.

• Journal of Computational Design and Engineering
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• 제2권4호
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• pp.206-217
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• 2015

This paper presents a complete S-shape feed rate scheduling approach (CSFA) with confined jerk, acceleration and command feed rate for parametric tool path. For a Non-Uniform Rational B-Spline (NURBS) tool path, the critical points of the tool path where the radius of curvature reaches extreme values are found firstly. Then, the NURBS curve is split into several NURBS sub-curves or blocks by the critical points. A bidirectional scanning strategy with the limitations of chord error, normal/tangential acceleration/jerk and command feed rate is employed to make the feed rate at the junctions between different NURBS blocks continuous. To improve the efficiency of the feed rate scheduling, the NURBS block is classified into three types: short block, medium block and long block. The feed rate profile corresponding to each NURBS block is generated according to the start/end feed rates and the arc length of the block and the limitations of tangential acceleration/jerk. In addition, two compensation strategies are proposed to make the feed rate more continuous and the arc increment more precise. Once the feed rate profile is determined, a second-order Taylor's expansion interpolation method is applied to generate the position commands. Finally, experiments with two free-form NURBS curves are conducted to verify the applicability and accuracy of the proposed method.

• 윤리연구
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• 제75호
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• pp.63-98
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• 2009

한국사회의 갈등지수는 상당히 높은 편이다. 이해관계가 맞서는 갈등상황에서 반대 입장에 대한 관용이 부족하여 문제를 평화적으로 해결하지 못하는 미성숙한 민주주의의 모습을 보여주고 있다. 극단적인 갈등으로 인한 사회적 비용을 줄이고 민주적으로 상대방과 소통하고 문제에 접근하는 교양 있는 시민을 육성하기 위해 협의적 가치를 내재한 의사소통교육이 중요하다. 본고는 대학 교양교육 차원에서 이루어지고 있는 <대화와 협상> 수업사례를 통해 의사소통교육의 필요성과 사회정치적 차원의 함의를 고찰해 보았다. 현재 대학사회에서 늘어나고 있는 말하기와 관련한 교양수업은 대체로 논리적이고 비판적인 사고방식을 키워주는데 초점이 맞춰져 있다. <대화와 협상> 교육은 이러한 사고능력을 기반으로 상대의 입장을 고려하는 정서적 측면과 갈등 사안을 협력적 관점에서 해결하려는 마인드를 키워준다는 점에서 그 의의가 있음을 살펴보았다. 이러한 의사소통 교육과정은 교수자가 아니라 학생이 중심이 되어 주체적으로 참여하며 문제를 해결하는 의사소통기술과 방법을 익힌다는 점에서 반복적인 실습과 구체적인 피드백을 통한 다양한 훈련 프로그램을 전제로 한다. 궁극적으로 대화와 협상 교육을 통해 학생들은 타자의 입장을 존중하며 갈등을 합리적으로 해결해 가는 성숙한 시민의식과 공동체의 구성원으로서 협의과정을 통해 문제를 해결하려는 자세와 책임의식을 명확히 할 수 있을 것이다.

• Wind and Structures
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• 제28권2호
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• pp.71-87
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• 2019

The yaw and interference effects of blades affect aerodynamic performance of large wind turbine system significantly, thus influencing wind-induced response and stability performance of the tower-blade system. In this study, the 5MW wind turbine which was developed by Nanjing University of Aeronautics and Astronautics (NUAA) was chosen as the research object. Large eddy simulation on flow field and aerodynamics of its wind turbine system with different yaw angles($0^{\circ}$, $5^{\circ}$, $10^{\circ}$, $20^{\circ}$, $30^{\circ}$ and $45^{\circ}$) under the most unfavorable blade position was carried out. Results were compared with codes and measurement results at home and abroad, which verified validity of large eddy simulation. On this basis, effects of yaw angle on average wind pressure, fluctuating wind pressure, lift coefficient, resistance coefficient,streaming and wake characteristics on different interference zone of tower of wind turbine were analyzed. Next, the blade-cabin-tower-foundation integrated coupling model of the large wind turbine was constructed based on finite element method. Dynamic characteristics, wind-induced response and stability performance of the wind turbine structural system under different yaw angle were analyzed systematically. Research results demonstrate that with the increase of yaw angle, the maximum negative pressure and extreme negative pressure of the significant interference zone of the tower present a V-shaped variation trend, whereas the layer resistance coefficient increases gradually. By contrast, the maximum negative pressure, extreme negative pressure and layer resistance coefficient of the non-interference zone remain basically same. Effects of streaming and wake weaken gradually. When the yaw angle increases to $45^{\circ}$, aerodynamic force of the tower is close with that when there's no blade yaw and interference. As the height of significant interference zone increases, layer resistance coefficient decreases firstly and then increases under different yaw angles. Maximum means and mean square error (MSE) of radial displacement under different yaw angles all occur at circumferential $0^{\circ}$ and $180^{\circ}$ of the tower. The maximum bending moment at tower bottom is at circumferential $20^{\circ}$. When the yaw angle is $0^{\circ}$, the maximum downwind displacement responses of different blades are higher than 2.7 m. With the increase of yaw angle, MSEs of radial displacement at tower top, downwind displacement of blades, internal force at blade roots all decrease gradually, while the critical wind speed decreases firstly and then increases and finally decreases. The comprehensive analysis shows that the worst aerodynamic performance and wind-induced response of the wind turbine system are achieved when the yaw angle is $0^{\circ}$, whereas the worst stability performance and ultimate bearing capacity are achieved when the yaw angle is $45^{\circ}$.

• 한국언론정보학보
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• 제77권
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• pp.36-72
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• 2016

정치적 산물로서 출범한 지 5년을 넘어선 종합편성채널의 영향력과 방송 영역에서의 지위가 상승하고 있다. 종편의 안정화는 저널리즘의 물량 공세에 기초한다. 끊임없이 반복적으로 쏟아 내는 뉴스와 시사토론 프로그램들이 '종편 타임대'라 불리는 오후 시간대를 점유한다. 시사토크쇼는 종편이 만들어 낸 대표적인 프로그램 형식이자 상품으로 독특한 종편 스타일 저널리즘을 이끌고 있다. 시사토크쇼의 주인공은 평론과 토론을 위해 모인 출연자들이다. 이 연구는 이들을 정치 매개 엘리트라는 개념적 위치화와 함께 TV조선, 채널A, MBN, JTBC의 대표적인 시사토크쇼에서 이들이 벌이는 텔레비전 정치의 풍경들을 살펴본다. 이 연구는 종편의 시청률을 상승시키고 시청자들의 이목을 집중시키는 시사토크쇼에서 정치 매개 엘리트들이 자신들의 정치적 편향성과 감정을 과감하게 드러내고 독특한 규정과 서술적 발화들을 통해 특정 대상들을 형상화하는 텔레비전 정치의 효과들을 읽어 내고자 한다. 이 연구에서 출연자로 불리는 정치 매개 엘리트들은 주로 극우, 보수, 중도보수적 정치 성향들을 가지며, 특정한 정당이나 정치 집단과 밀착된 관계를 형성한다. 정치 매개 엘리트들은 종편 시사토크쇼에서 수행하는 텔레비전 정치를 통해 대중들에게 영향을 미치는 자산을 확보하면서 정치 집단과 정치적 교환 혹은 거래 관계를 형성한다. 이 같은 정치적 동원, 교환, 거래의 관계 속에 종편의 시사토크쇼가 위치하며, 시사토크쇼는 정치적 전장으로 존재할 수밖에 없다는 점을 이 연구는 강조한다.