• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.1993-1998
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• 2004

The present study was carried out to develop highly efficient RC ornithopter 'Songgolmae' powered by motor and battery. Designed electric ornithopter weighs 277 grams and has 3 channels radio control. 1t runs on an electric motor by a lithium polymer battery and has a gear ratio of about $75{\sim}95$ to 1 to flap its 88 cm wingspan. The aerodynamic performance of the ornithopter, applied to a flapping motion only, was validated by flight tests. Flight times have exceeded 23 minutes until the battery was used up. The flight test results indicate that the ornithopter developed here has sufficient thrust to propel itself in a forward flight. From the economical point of view and the handling of the RC ornithopter, it can be said that the developed robot ornithopter is an effective RC ornithopter. This radio controlled ornithopter flies its way high into the sky just like a real bird flies.

• 로봇학회논문지
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• 제10권2호
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• pp.104-111
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• 2015

In this paper, we proposed visual information to provide a highly maneuverable system for a tele-operator. The visual information image is bird's eye view from UFR(Unmanned Flying Robot) shows around UGR(Unmanned Ground Robot). We need UGV detection and tracking method for UFR following UGR always. The proposed system uses TLD(Tracking Learning Detection) method to rapidly and robustly estimate the motion of the new detected UGR between consecutive frames. The TLD system trains an on-line UGR detector for the tracked UGR. The proposed system uses the extended Kalman filter in order to enhance the performance of the tracker. As a result, we provided the tele-operator with the visual information for convenient control.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.885-887
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• 2003

The purpose of this investigation is to generate true orthophotos from high resolution satellite images. The major works of this research include 4 parts: (1) determination of orientation parameters, (2) generating traditional orthophotos using terrain model, (3) relief correction for buildings, and (4) process for hidden areas. To determine the position of satellites, we correct the onboard orientation parameters to fine tune the orbit. In the generation of traditional orthophotos, we employ orientation parameters and digital terrain model(DTM) to rectify tilt displacements and relief displacements for terrain. We, then, compute relief displacements for buildings with digital building model (DBM). To avoid double mapping, we detect hidden areas. Due to the satellite’s small field of view, an efficient method for the detection of hidden areas and building rectification will be proposed in this paper. Test areas cover the city of Kaohsiung in southern Taiwan. Test images are from the QuickBird satellite.

• 로봇학회논문지
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• 제18권1호
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• pp.59-65
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• 2023

This paper proposes an Extended and Adaptive Inverse Perspective Mapping (EA-IPM) model that can obtain an accurate bird's-eye view (BEV) from the forward-looking monocular camera on the sidewalk with various curves. While Inverse Perspective Mapping (IPM) is a good way to obtain ground information, conventional methods assume a fixed relationship between the camera and the ground. Due to the nature of the driving environment of the mobile robot, there are more walking environments with frequent motion changes than flat roads, which have a fatal effect on IPM results. Therefore, we have developed an extended IPM process to be applicable in IPM on sidewalks by adding a formula for complementary Y-derive processes and roll motions to the existing adaptive IPM model that is robust to pitch motions. To convince the performance of the proposed method, we evaluated our results on both synthetic and real road and sidewalk datasets.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 추계학술발표대회
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• pp.1165-1166
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• 2023

본 논문에서는 YOLOPv2 를 기반으로 OpenCV 를 활용한 후처리 과정을 도입하여 차선 검출 성능을 극대화할 수 있는 알고리즘을 제안한다. 주요 단계로는 YOLOPv2 모델을 활용한 차선 인식, Bird's eye view 변환, Sobel 및 Morphology Filter 를 통한 왜곡 보정, Histogram 기반 차선 검출, 그리고 후처리 알고리즘 적용이 있다. 이 기술은 자율 주행 및 도로 정보 활용 분야에 활용 가능할 것으로 기대되며, 차선 검출 정확도를 향상시킬 수 있다.

• 건축역사연구
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• 제6권3호
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• pp.129-143
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• 1997

The perspective representation and its effect that appeared in the tombs and mural paintings of koguryo are summarized as follows: First, The inside structure of the tombs is likely to show the deepness effect, placing each function in the front and both sides centering around the mane pillars and creating the boundaries and the spaces that have various visibility between the inside and outside spaces of the structure just like a traditional Korean house shows. In addition, The deepness effect is emphasized by suggesting that the spaces are countinued with a storage attached behind the main house or by forming the level and deployment in a narrow space like the scene that a large array is looked out from the main house. Second, The deepness effect is expressed by making the form of ceiling turn to a vertical space of an ascending image, constructing it just as the lotus lamp ceiling of a wooden architecture or drawing it just like the imaginary heavenly world with the sun the moon and mythical fairies and animals spread in it. Thried, The perspective effect is disclosed by drawing the mural pictures in an equally set bird's-eye view without regard to the disfance proportion according to the conceptual visualization which is not a visual penetration, adopting the multiple view points and moving view points that are moving around as an important manner of seeing. Fourth, The deepness effect is emphasized through the scene of changing spaces when they are looked out far or looked into depending on a viewpoint of the daily life by forming the fromes of paintings that we made up with actual pillars, Du Gong, crossbeams or that are painted in most tombs. Fifth, The rich spatial senses are reflected by originating the characters of the three directions, level, deployment and ascending. An example which can support the conclusion of this study can be given here. that is, the construction ground plan of a dwelling house of a nobleman at the end of Koguryo as a remain which was excavated at Dongdae Ja in Jip An.

• 전기전자학회논문지
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• 제20권3호
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• pp.241-250
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• 2016

AVM(Around View Monitor)시스템은 ADAS(Advanced Driver Assistance Systems)의 한 종류로 운전자가 차량 주변을 한눈에 파악할 수 있게 도와주는 차량 시스템이다. AVM 시스템은 네 개의 카메라에서 입력받은 데이터를 실시간 처리하기 때문에 요구되는 메모리 대역폭이 크다. 특히 입력 영상의 해상도 증가에 따라 메모리 대역폭 수치가 크게 증가하기 때문에, 필요한 메모리 대역폭에 맞는 하드웨어 구조 설계가 필요하다. 본 논문은 설계에 기틀이 될 AVM 시스템 하드웨어 모델 네 종류를 제시한다. 각 모델은 입력 영상으로부터 유효 데이터를 추출하는 모듈의 유무, 영상처리를 위한 LUT 생성 모듈 유무로 결정된다. 논문에서는 모델 별로 상이한 필요 메모리 대역폭과 하드웨어 자원 사용량이 제시된다. 이를 토대로 설계자의 요구 사항에 맞는 모델을 선택하고 구현할 수 있다. 제시한 하드웨어 모델의 검증을 위해 VGA, FHD급 AVM 시스템을 구현하였다. 구현에는 XC7Z045 FPGA, DDR3가 이용되었으며, 30FPS로 동작한다.

• 한국의류학회지
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• 제31권9_10
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• pp.1475-1486
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• 2007

This study aims to develop knitted ware design to meet desire to express diversity in the modern fashion design so that we designed knitted ware by applying african geometric pattern and color to suggest new knitted ware design. We collect data about african texture pattern through technical books, publications, internet, and preceding research and visit and investigate the African museum. We investigate knitted Jacquard texture through preceding research and collect sample and data which is insufficient in the data source. The conclusions in this study are summarized as follows: First, African textile pattern is formulated with animism based on their religious view of art for a basis and African regards nature like animal and plant as a motive and interprets nature in the so that they can create symbolized geometric features that constitute African texture pattern. Those patterns is composed of extremely geometric figures so that they we fit to apply for color jacquad knit design. Second, color knitted jacquad can be distinguished by knitting method and status of knitting as 7 kinds of techniques such as Nomal, Bird'eye, Floating, Tubular, Ladder's back, Blister, Transfer Jacquard, and as a result of preceding research and knitting texture directly, jacquard technique makes different texture under same condition like consistent spinning rate and same crochet hook. Third, Bird'eye Jacquard used generally to make knitted ware and Ladder's back Jacquard, Tubular Jacquard used to make knitted ware light are fit to apply them to 7GG and 12GG machines. We design a cloak as a outer garment, a coat shaped like one-piece dress and a coat with hood by using Tubular Jacquard which can make thick texture and design a jacket, a skirt and a one-piece dress by using Bird'eye Jacquard. we make a light and flimsy one-piece dress by using Ladder's back Jacquard. Fourth, we apply the contrast of $4{\sim}6$ color and line and the contrast of texture and raw material to jacquard in order to emphasize texture property and visual property.

• 한국습지학회지
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• 제22권4호
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• pp.225-238
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• 2020

농업경관은 서비스 기능을 제공하는 중요 공간으로 평가받지만 시설원예단지 조성은 환경적, 생태적 문제점이 보고되고 있는 것이 현실이다. 따라서 본 연구에서는 시설원예단지를 보다 친환경적으로 조성하여 지속가능 농업에 기여하고자 진행되었다. 시설원예단지의 친환경적 조성을 위한 계획 요소는 문헌과 전문가 설문으로 도출하였다. 이후 계획요소를 적용하여 마스터플랜과 조감도를 새만금지역에 적용하였다. 기능향상을 위한 투입요소 선정과 배치방법을 분석 한 결과 저류지, 습지, 인공저장 시설, 녹지공간, 수로를 경관과 어울리게 배치하고 건폐율은 55%로 적용하도록 제안받았다. 전문가들에게 제안받은 생태계서비스 기능 향상방안을 적용하여 최종 조감도를 작성하였다. 최종 조감도에는 수질정화시설, 습지와 수로 연결, 투수포장, 녹지 연계 등을 반영하였다. 연구결과는 시설원예 친환경적 조성에 대한 정책 및 예산배정의 기초 자료로 활용하고 국가 생물다양성 및 환경보전에 이바지 하여 지속가능한 농업에 기여 할 수 있을 것으로 기대한다.

• 한국실내디자인학회논문집
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• 제20권5호
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• pp.160-169
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• 2011

In Korea, the construction company has provided houses through apartment sales system. Residents have obtained a variety of information about their future house by visiting a sample house called "the model house" before they purchase home. Advanced technology such as web-based VOD or Virtual Model in recent years has gradually replaced those built environment. In 2009, the Ministry of Land, Transport and Maritime Affairs announced the restraint to the construction of sample houses. Instead, they highly recommended a Virtual Model House as an alternative solution. This study aimed to propose how to design the user-oriented virtual model house through the experiment and survey research. The 3D virtual model house of 85m$^2$ apartment was built and presented by two types (Type A: Bird's Eye View, Type B: Walk through View) on the web page. The subjects evaluated presence, spatial perception and cognition, and usability of each type after exploring them. The results are as follows. (1) The subjects' evaluation of presence showed Type B has more negative effects than Type A such as feeling dizzy or tired even if their values were not so high. (2) The subjects perceived and cognized both types of virtual model house more realistic for the expression of volume of space, the size of opening, and the arrangement of furniture than that of wall finishes and materials. (3) The usability of Type A was significantly higher than that of Type B.