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정제 모듈을 포함한 컨볼루셔널 뉴럴 네트워크 모델을 이용한라이다 영상의 분할
박병재,서범수,이세진 한국로봇학회 2018 로봇학회 논문지 Vol.13 No.1
This paper proposes a convolutional neural network model for distinguishing areas occupied by obstacles from a LiDAR image converted from a 3D point cloud. The channels of a LiDAR image used as input consist of the distances to 3D points, the reflectivities of 3D points, and the heights of 3D points from the ground. The proposed model uses a LiDAR image as an input and outputs a result of a segmented LiDAR image. The proposed model adopts refinement modules with skip connections to segment a LiDAR image. The refinement modules with skip connections in the proposed model make it possible to construct a complex structure with a small number of parameters than a convolutional neural network model with a linear structure. Using the proposed model, it is possible to distinguish areas in a LiDAR image occupied by obstacles such as vehicles, pedestrians, and bicyclists. The proposed model can be applied to recognize surrounding obstacles and to search for safe paths.
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컨볼루션 뉴럴 네트워크와 키포인트 매칭을 이용한 짧은 베이스라인 스테레오 카메라의 거리 센싱 능력 향상
박병재 한국센서학회 2024 센서학회지 Vol.33 No.2
This study proposes a method to overcome the limited detection range of short-baseline stereo cameras (SBSCs). The proposed method includes two steps: (1) predicting an unscaled initial depth using monocular depth estimation (MDE) and (2) adjusting the unscaled initial depth by a scale factor. The scale factor is computed by triangulating the sparse visual keypoints extracted from the left and right images of the SBSC. The proposed method allows the use of any pre-trained MDE model without the need for additional training or data collection, making it efficient even when considering the computational constraints of small platforms. Using an open dataset, the performance of the proposed method was demonstrated by comparing it with other conventional stereobased depth estimation methods.
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춘천지역의 참취 및 삼지구엽초의 자생지 식생 및 환경특성
박병재 한국자원식물학회 1997 한국자원식물학회지 Vol.10 No.4
Vegetation and environment in natural habitats of Aster scaber and Epimedium koreanum around Chunchon was studied to eatablish agroforestry technology for high quality production of wild vegetable. The number of species within the quadrat in natural habitat of Aster scaber was respectively 20, 26, and 25 in Chunchon A, Mt. Yeonyup A, and Mt. Yeonyup B. The number of species within the quadrat in natural habitat of Epimedium koreanum was respectively 15, 32, and 26 in Chunchon B, Bukbangmyon, and Mt. Taeryong. The dominant species in habitat of Aster scaber was respectively Artemisia keiskeana, Disporun smilacinum, and Calamagrostis arundinacea in Chunchon A, Mt. Yeonyup A, and My. Yeonyup B while that in habitat of Epimedium koreanum was respectively Pteridium aquilinum. Artemisia keiskeana, and Disporun smilacinum in Chunchon B, Bukbangmyon, and Mt. Taeryong. Soil pH in habitats of Aster scaber and Epimedium koreanum ranged from 4.5 to 5.3. The contents of organic matter in habitat soil ranged from 1.5% in Chunchon A to 5.5% in Mt. Yeonyup B. The contents of ammonia-nitrogen and nitrate-nitrogen in soil were respectively 0.0043 mg/kg in habitat of Aster scaber and 0.0025mg/kg in habitat of Epimedium koreanum.
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박병재 한국자원식물학회 1997 한국자원식물학회지 Vol.10 No.2
To establish the culture practices for mass propagation of Epimedium koreanum, root propagules were preserved with different methods. Bud emergence rate and number of multiple buds were the highest in root segments obtained from roots with buds which were preserved in open-burial. Plant height, leaf area, and number of new buds were the highest in root segments obtained from roots preserved with stratification.
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박병재,이주경,신지현,박종인,김남수,박철호 한국유전학회 2006 Genes & Genomics Vol.28 No.2
AFLP markers were employed to detect genetic diversity and genetic relationship among cultivated and wild Tartary buckwheat accessions collected from East Asia and other countries. Analysis of 50 accessions of cultivated and wild Tartary with eight AFLP primer set combinations detected a total of 334 bands, of which 121 (36.2%) were polymorphic at the species level. The genetic similarity coefficient for all accessions ranged from 0.31 to 1.00. While GS between accessions among the cultivated Tartary buckwheat accessions ranged from 0.72 to 1.00, GS between accessions among the wild Tartary accessions ranged from 0.31 to 0.88. Shannon's index diversity also revealed that the cultivated Tartary buckwheat accessions were less diverse than the wild Tartary buckwheat. The phenetic tree with the AFLP fingerprint recognized two major groups at 81% genetic similarity. Group I contained most of the cultivated Tartary buckwheat accessions and three wild Tartary buckwheat accessions, and Group II contained only five wild Tartary buckwheat accessions. Most wild Tartary buckwheat accessions, with several exceptions, were placed distantly from the main cluster of cultivated Tartary buckwheat. The presenting data on the assessment of genetic diversity and genetic relationships among Tartary buckwheat accessions will be helpful to build effective Tartary buckwheat breeding programs in Korea.
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60 ㎐ 자기장이 예쁜꼬마선충의 생식에 미치는 영향 연구
박병재,장혜진,김희성,강희은,심혜림,최유미,김윤명,김남,김윤원 한국전자파학회 2010 전자파기술 Vol.21 No.3
60 ㎐ 자기장에서 예쁜꼬마선충(C. elegans)의 발생 및 생식에 미치는 영향을 조사하였다. 자기장 노출 조건은 0~500 μT이며, 실험 온도는 선충의 일반적 배양 온도 범위(21.2±0.6 ℃)에서 일정하게 유지하였으며, 노출은 선충의 배양 기간 동안 지속되었다. C. elegans 야생형 N2 및 스트레스에 민감한 hsf-1와 crt-1 등의 돌연변이체들에서 실험에 사용한 노출 조건에 따른 생식력의 차이는 없었다. 여러 세대에 걸쳐 자기장에 노출한 경우에도 자기장에 의한 생식력의 변화는 없었다. 결론적으로, C. elegans는 크기가 매우 작으므로(길이 약 1 ㎜) 유도전류가 적게 발생하여, 자기장(~500 μT)에 의한 영향이 없는 것으로 사려된다.
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