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초미세결정립 Fe73.5Cu₁Nb₃Si16.5B6 합금의 Mossbauer 효과 연구
신영남(Young Nam Shin),김재경(Jae Gyeung Kim),양재석(Jae Suk Yang),조익한(Ick Han Cho),강신규(Sin Giu Kang) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.1
The crystallization behavior of the amorphous Fe_(73.5)Cu₁Nb₃Si_(16.5)B_6 alloy with isothermal annealing at 552 ℃ was studied by Mossbauer spectroscopy. The amorphous phase was revealed to coexist together with DO₃-FeSi nanocrystalline and Cu-duster in annealed alloys by Mossbauer spectrum analysis. At the early stage of crystallization, Si content of FeSi is high due to the creation of Cu-cluster, and decreases with annealing until 60 minutes, which results in the increase in the mean hyperfine field of FeSi, and thereafter keeps constant. After 60 minutes, the decrease in the mean hyperfine field of the residual amorphous, in spite of a slight change in the volume fraction of the FeSi and the residual amorphous, is caused by the increase in the content of Nb and B in residual amorphous phase. Both directions of the hyperfine field, those of the FeSi and the residual amorphous, become randomly oriented in about 60 minutes. For FeSi and Cu-duster, the Avrami exponents are 0.51 and 0.65, the activation energies are 2.35 eV and 2.44 eV, and the incubation times are 2.4 minutes and 0.8 minutes respectively. Earlier formation of Cu-duster than that of FeSi is coincidence with the fact that Cu atom promotes the nucleation of the FeSi.
AVM 카메라와 융합을 위한 다중 상용 레이더 데이터 획득 플랫폼 개발
진영석,전형철,신영남,현유진,Jin, Youngseok,Jeon, Hyeongcheol,Shin, Young-Nam,Hyun, Eugin 대한임베디드공학회 2018 대한임베디드공학회논문지 Vol.13 No.4
Currently, various sensors have been used for advanced driver assistance systems. In order to overcome the limitations of individual sensors, sensor fusion has recently attracted the attention in the field of intelligence vehicles. Thus, vision and radar based sensor fusion has become a popular concept. The typical method of sensor fusion involves vision sensor that recognizes targets based on ROIs (Regions Of Interest) generated by radar sensors. Especially, because AVM (Around View Monitor) cameras due to their wide-angle lenses have limitations of detection performance over near distance and around the edges of the angle of view, for high performance of sensor fusion using AVM cameras and radar sensors the exact ROI extraction of the radar sensor is very important. In order to resolve this problem, we proposed a sensor fusion scheme based on commercial radar modules of the vendor Delphi. First, we configured multiple radar data logging systems together with AVM cameras. We also designed radar post-processing algorithms to extract the exact ROIs. Finally, using the developed hardware and software platforms, we verified the post-data processing algorithm under indoor and outdoor environments.
김경태,박종일,신영남,Kim Kyung-Tae,Park Jong-Il,Shin Young-Nam 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.3
본 논문에서는 ISAR 영상을 이용하여 표적을 식별하기 위한 알고리즘을 제안한다. 표적의 식별은 최소한의 시간에 정확하게 이루어져야 한다. 그러나 기존의 방식은 ISAR 영상을 그대로 이용하기 때문에 같은 표적에 대한 영상이더라도 레이더에서 표적까지의 거리, 표적의 운동방향 및 속도에 따라 ISAR영상이 변하는 문제점이 있다. 표적의 회전 및 크기 변화에 대해 변하지 않고, 차원이 낮으며, 표적 식별에 필요한 중요한 정보를 포함하는 특징만 영상에서 추출하여 식별에 이용함으로써 정확도는 높이고 계산량과 계산 시간을 줄일 수 있다. 위의 나열된 특성벡터가 갖춰야 할 조건을 만족시키기 위해 본 논문에서는 극사상법 및 적절한 구분기를 제안하며, 기존의 방식과 비교하여 성능을 평가한다 In this paper, we propose a method to classify inverse synthetic aperture radar(ISAR) image from different target. The approach can provide efficient features for classification by the combined use of a polar mapping procedure and a well-designed classifier The resulting feature vectors are able to meet requirements that efficient features should have : invariance with respect to rotation and scale, small dimensionality, as well as highly discriminative information. Typical experimental examples of the proposed method are provided and discussed.
초미세결정립 Fe73.5Cu₁Nb₃Si16.5B6 합금의 뫼스바우어 효과 연구
김재경(Jae Gyeung Kim),신영남(Young Nam Shin),양재석(Jae Suk Yang) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Amorphous Fe_(73.5)Cu₁Nb₃Si_(16.5)B_6 ribbons were annealed for different time at 500℃ and 552℃, just before and after the exothermic reaction in DSC curve. The development of nanocrystalline phase was investigated by means of Mossbauer spectroscopy. The crystalline phase consists mainly of DO₃ Fe-Si. Though slight in amount (5 %), another ferromagnetic phase which could be presumed t-Fe₃B was detected Si content of DO₃ Fe-Si, Si/(Fe+SO, was 0.218 under the heat treatment at 500℃ for 60 min and 0.222 at 552℃ for 10 min. Since then both of those values decreased with time until 120 min and finally these two values remained constant at 0.210. The variation in Si content with annealing time results in the variation in the hyperfine field and the isomer shift. The increase in the mean hyperfine fields and the decrease in the mean isomer shifts of Fe-Si are caused by the increase in Si content. The volume fractions of residual amorphous phase rapidly decrease during the early stage of annealing and come nearer to saturation after 120 min both at 500℃ and 552℃. The decrease in the mean hyperfine field of residual amorphous, in spite of slight changes in the volume fractions of Fe-Si and of residual amorphous after 120 min, is caused by the increase in the content of Nb and B in residual amorphous phase. The saturated volume fraction of the crystalline phase was 81 % for 500℃ (180 min) and 77 % for 552℃ (960 min), different from expectation.
식물 생장 조정제가 가지의 착과 및 수량에 미치는 영향
이정수(Jung-Soo Lee),신영안(Young-An Shin),엄영철(Yeong-Cheol Um),이상남(Sang-Nam Lee) 한국원예학회 2004 원예과학기술지 Vol.22 No.4
Plant growth regulators (PGRs) can be used to induce fruit setting and development of eggplant during unfavorable winter conditions, such as low light intensity and low temperature. To select an effective PGR, optimal concentration, and spray interval, three PGRs (cloxyfonac, 4-CPA, and CPPU) at three levels of concentration and two spray intervals (once every day and every five days) were tested on eggplant planted in a plastic house. Fruit set and development were similar in cloxyfonac and 4-CPA. However, cloxyfonac at 490 ㎎ㆍL?¹ produced higher marketable yield than the other treatments. Spray interval did not affect marketable yield. Therefore, cloxyfonac applied at 490 ㎎ㆍL?¹ every five days was recommended because it is labor-saving.