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Applying FastPhotoStyle to Synthetic Data for Military Vehicle Detection
Hyeongkeun Lee,Kyungmin Lee,Hunmin Yang,Se-Yoon Oh 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Object detection is one of the main task for the deep learning applications. Deep learning performance has already exceeded human’s detection ability, in the case when there are lots of data for training deep neural networks. In the case of military fields, there are needs to resolve the data shortage problem to employ deep learning system efficiently with benefits. Generating the synthetic data can be a solution, but the domain gap between the synthetic and real data is still an obstacle for training the model. In this paper, we propose a method for decreasing the domain gap by applying style transfer techniques to synthetic data for military vehicle detection. Utilizing FastPhotoStyle to the synthetic data aids efficiently improving the accuracy of object detection when the real data is insufficiency for training. Specifically, we show that stylization which enables artificial data more realistic diminishes the domain gap by evaluating the visualization of their distributions using principal component analysis and Fréchet inception distance score. As a result, the performance has been improved about 8% in the AP@50 metric for stylized synthetic data.
Hyeongkeun Kim,Cheesung Lee,최재붕,전경용,김영진,백승현 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
The effects of sandwich-like catalysts on the vertical growth of multiwalled carbon nanotubes (MWCNTs) are investigated. We achieved the synthesis of 2.2-mm-long MWCNT forests with carefully designed catalyst films by thermal chemical vapor deposition. Two types of sandwich-like catalysts were prepared by electron beam evaporation. Fe and Al2O3 layers were deposited on a SiO2 surface of 300 nm in thickness. Here, Fe and Al2O3 were used for the catalyst and the supporting buffer layer, respectively. C2H4 was used as a carbon source while Ar and H2 were used as carrier gases. The sandwich-like catalyst supported by a buffer layer of Al2O3 significantly enhanced the quality of the CNTs. The termination of MWCNT growth was found to depend on the position of the Fe layer. Also, the type of sandwich-like catalyst affects the crystalline perfection of the MWCNTs.
Improving Instance Segmentation using Synthetic Data with Artificial Distractors
Kanghyun Park,Hyeongkeun Lee,Hunmin Yang,Se-Yoon Oh 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Despite the advances in deep learning, training instance segmentation models like convolutional neural networks still tend to depend on enormous training data that are expensive and require labor to annotation. To avoid labor-intensive procedure, synthetic data can be an alternative because it is easy to generate and automatically segmented. However, it is challenging to train instance segmentation model that perform well at real world using only synthetic data because of domain gap. It is wrong direction to put a lot of effort into solving these problems by making synthetic data more photorealistic. In this paper, we suggest how to learn the instance segmentation model using synthetic data with artificial distractors. The performance has been improved about 7% by adding flying distractors compared to original synthetic data.
Roll-to-roll production of 30-inch graphene films for transparent electrodes
Bae, Sukang,Kim, Hyeongkeun,Lee, Youngbin,Xu, Xiangfan,Park, Jae-Sung,Zheng, Yi,Balakrishnan, Jayakumar,Lei, Tian,Ri Kim, Hye,Song, Young Il,Kim, Young-Jin,Kim, Kwang S.,Ö,zyilmaz, Barbaros,Ahn, J Springer Science and Business Media LLC 2010 Nature nanotechnology Vol.5 No.8
구기운 ( Kiwoon Koo ),권형근 ( Hyeongkeun Kweon ),이상인 ( Sang In Lee ),권세명 ( Semyung Kwon ),서정일 ( Jung Il Seo ) 한국산림과학회 2021 한국산림과학회지 Vol.110 No.4
이 연구에서는 산지관리법에서 규정하고 있는 복구비 산출체계의 문제점과 그 개선방안을 파악하고, 이에 근거한 산지복구 표준모델을 개발하여 최적 복구비 산출체계를 도출하고자 전문가 그룹을 대상으로 델파이조사를 실시하였다. 그 결과, 현행 복구비 산출체계의 문제점으로 ‘토지이용 유형의 부적정’, ‘산지경사 등급의 부적정’, ‘산지복구 기준공종의 불충분’이 채택되었다. 이러한 문제점의 개선방안으로 토지이용 유형을 ① 산지전용허가ㆍ신고지 및 산지일시사용허가지, ② 산지일시사용신고지, ③ 토석채취(매각)ㆍ광물채굴허가지, ④ 토사채취허가지로 재편성하는 것, 산지경사 등급을 ① θ<10°, ② 10°≦θ<15°, ③ 15°≦θ<20°, ④ 20°≦θ<25°, ⑤ 25°≦θ<30°, ⑥ θ≧30°으로 세분화하는 것, 기존 17개 기준공종 중 3개 공종이 제외되고 15개 공종이 추가된 22개 기준공종 및 7개 추가공종으로 재편성하는 것이 합의되었다. 이상의 결과에 준하여 개발한 24개 표준모델을 토대로 산출한 복구비는 34,185∼607,403천원 범위로 나타났으며, 여기에 추가공종, 할증 또는 할인, 감리비가 적용되면 토석채취(매각)ㆍ광물채굴허가지에서 최대 668,143천원에 이르는 것으로 나타났다. 이러한 표준모델에 의한 복구비 분포에 대해서도 전문가들의 의견은 높은 수준에서 합의가 이루어졌다. 이상의 연구결과는 대집행 복구사업의 원활한 수행을 위해 예치되는 복구비의 적정성을 확보하는 데에 기여할 수 있을 것으로 기대한다. We determined the current problem of the restoration deposit-estimation system, stipulated by the Mountainous Districts Management Act, using the Delphi technique. Consequently, we proposed a standard model for forest land restoration to derive a reasonable deposit-estimation system. With the result of the Delphi survey, the inappropriateness of land-use type and slope gradient classifications was shown; the insufficiency of standard works was a significant problem in the current system. A way to solve these problems was devised, to reorganize the current land-use type into the subject of the site. The specific subjects included the following: (i) to permit or report forest land-use change and temporary use of forest land, (ii) to report temporary use of forest land, (iii) to permit stone collection or sale for mineral mining, and (iv) to allow sediment collection. The current slope gradient subdivision into (a) θ<10°, (b) 10°≦θ<15°, (c) 15°≦θ<20°, (d) 20°≦θ<25°, (e) 25°≦θ<30°, and (f) θ≧30° and the reorganization of 17 standard works into 22 standard works were deemed as solutions, along with seven additional works. We developed 24 standard models for the forest land restoration project based on the aforementioned results. The deposits estimated by these models ranged from 34,185,000 (Korean) won to 607,403,000 won. If additional works, premiums, discounts, and supervision fees are added to the models, the deposit increases to an estimated 668,143,000 won subject to permission for stone collection or sale and mineral mining. Experts agree on the distribution of the restoration deposits estimated by these models at a high level in the Delphi survey. Our findings are expected to contribute to securing the appropriateness of the restoration cost deposited for the smooth performance of the vicariously executed restoration project.
High-performance graphene-based transparent flexible heaters.
Kang, Junmo,Kim, Hyeongkeun,Kim, Keun Soo,Lee, Seoung-Ki,Bae, Sukang,Ahn, Jong-Hyun,Kim, Young-Jin,Choi, Jae-Boong,Hong, Byung Hee American Chemical Society 2011 NANO LETTERS Vol.11 No.12
<P>We demonstrate high-performance, flexible, transparent heaters based on large-scale graphene films synthesized by chemical vapor deposition on Cu foils. After multiple transfers and chemical doping processes, the graphene films show sheet resistance as low as 43 Ohm/sq with 89% optical transmittance, which are ideal as low-voltage transparent heaters. Time-dependent temperature profiles and heat distribution analyses show that the performance of graphene-based heaters is superior to that of conventional transparent heaters based on indium tin oxide. In addition, we confirmed that mechanical strain as high as 4% did not substantially affect heater performance. Therefore, graphene-based, flexible, transparent heaters are expected to find uses in a broad range of applications, including automobile defogging/deicing systems and heatable smart windows.</P>
서민규(Minkyu Seo),이형근(Hyeongkeun Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A CAE simulation for the slam durability test of moving parts is proposed using explicit code. Previously other techniqes usging implicit code were proposed, but they are restricted in the description of the impact of the moving parts. To overcome the restrictions, Explicit code is adopted and proper modeling methods are proposed for the moving parts which includes side doors, hood, trunk lid. In this paper, the detail modelings of subcomponents are proposed including weather strip, locking mechanism, latch, striker, gas lifter, balance bar. Using the developed modeling technique, slam simulations and stress analyses are done and the life is predicted for the door, hood and trunk lid. Also the future works is discussed to simulate the behavior of the moving parts better with the test result.