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CNN을 이용한 Al 6061 압출재의 표면 결함 분류 연구
김수빈,이기안 한국소성∙가공학회 2022 소성가공 : 한국소성가공학회지 Vol.31 No.4
Convolution Neural Network(CNN) is a class of deep learning algorithms and can be used for image analysis. In particular, it has excellent performance in finding the pattern of images. Therefore, CNN is commonly applied for recognizing, learning and classifying images. In this study, the surface defect classification performance of Al 6061 extruded material using CNN-based algorithms were compared and evaluated. First, the data collection criteria were suggested and a total of 2,024 datasets were prepared. And they were randomly classified into 1,417 learning data and 607 evaluation data. After that, the size and quality of the training data set were improved using data augmentation techniques to increase the performance of deep learning. The CNN-based algorithms used in this study were VGGNet-16, VGGNet-19, ResNet-50 and DenseNet-121. The evaluation of the defect classification performance was made by comparing the accuracy, loss, and learning speed using verification data. The DenseNet-121 algorithm showed better performance than other algorithms with an accuracy of 99.13% and a loss value of 0.037. This was due to the structural characteristics of the DenseNet model, and the information loss was reduced by acquiring information from all previous layers for image identification in this algorithm. Based on the above results, the possibility of machine vision application of CNN-based model for the surface defect classification of Al extruded materials was also discussed.
김수빈,권윤희,김인범,서영준,한재상,서재현,이현진,박경호 대한이비인후과학회 2020 대한이비인후과학회지 두경부외과학 Vol.63 No.12
Background and Objectives Ototoxic sensorineural hearing loss causes permanent hearingloss in most cases. Recently there have been many reports describing cell base therapywith stem cells that has some effect on hearing recovery. We evaluated the efficacy of clinicalgrade, pre-made, human bone marrow derived mesenchymal stem cells (BM-MSCs) in ototoxicdeaf animal model. Materials and Method BM-MSCs were cultured in a clinical grade laboratory. The animalswere divided into 2 groups as follows: a saline injected control group and a stem cell injectedgroup (MSC-group). Cultured MSCs were transplanted into the brachial vein of the deaf micemodel. We recorded auditory brainstem response (ABR) and conducted immunohistochemistryat 1, 3, and 5 weeks. Results After the transplantation of MSC, a significant improvement in the hearing thresholdof ABR was observed in the MSC transplanted group. Five weeks after transplantation ofMSCs, hair cell regeneration was confirmed from the basal to the apex of the cochlea in fluorescentdyed image under the microscope compared to the control group. Conclusion BM-MSCs were effective in an acute ototoxic deaf animal model. These resultsshow that stem cell transplantation mediate inner ear regeneration.
이익충돌 상황에서 공개가 자문행동에 주는 효과: 자문가역할수행집단과 사익추구집단의 비교
김수빈,김지혜,정경미 한국문화및사회문제심리학회 2016 한국심리학회지: 문화 및 사회문제 Vol.22 No.1
A conflict of interest (COI) places people in ethical dilemma when providing consultation in a field of business, medical/pharmaceutical industry, research etc. Disclosure is a commonly adopted strategy for the adverse effect of COI, but previous studies have reported inconsistent results. This investigated whether individual differences in pursuing self-interest influence differently on consultation behavior during voluntary- or no-disclosure of COI conditions. A total of 190 adults participated in an on-line experiment which consisted of two tasks. On the 1st task, participants were divided into either a role-oriented group or a self-interest group depending on their consultation choice on the task. On the 2nd task, participants were required to choose whether to disclose COI to his/her virtual partner and provided consultation to them. No group differences were found in frequency of choosing voluntary disclosure. For the role-oriented group, the voluntary disclosure group provided unbiased information to the virtual partners than the no disclosure group. However, no group difference between voluntary- and no-disclosure group in the self-interest group. Implications and limitations are further discussed. 이익충돌은 경영, 의학, 연구 등 자문이 필요한 상황에서 윤리문제를 일으키는 주요인 중 하나로 파악된다. 실제 현장에서는 공개를 해결책으로 주로 사용하고 있으나, 공개의 효과에 대한 기존 연구들의 보고는 일관적이지 않다. 본 연구에서는 개인의 이익추구 성향에 따라 공개가 자문 행동에 주는 효과가 달라지는지를 실험적으로 연구하였다. 참가자는 20대에서 40대의 성인남녀 190명(남: 65명, 여: 125명)으로, 온라인으로 실험과 설문조사에 응답하였다. 실험에서 참가자는 자문가가 되어 가상의 파트너에게 정보를 제공하였다. 이때 참가자는 자문가로서의 역할을 수행하면 적은 보상을 받으나 사익을 추구하면 많은 보상을 받게 되는 이익충돌 상황에 노출되었다. 총 2개의 과제 중 첫 번째 과제를 통해 자문가 역할을 최대화하는 집단과 사익추구를 최대화하는 두 집단으로 구분하였다. 두 번째 과제에서는 이 두 집단에게 각각 이익충돌 상황에 대해 공개 여부를 자발적으로 결정하게 한 뒤 공개여부가 후속적인 자문행동에 어떠한 영향을 주는 지 탐색하였다. 연구 결과, 자문가역할수행집단과 사익추구집단 간 공개여부의 선택비율에는 차이가 없었다. 그러나, 두 집단 간 공개여부에 따라 자문행동에는 차이를 보였는데, 자문가역할수행집단에서는 자발적으로 공개를 선택한 집단이 비공개를 선택한 집단에 비해 파트너에게 정확한 정보를 제공해 주었다. 반면, 사익을 추구한 집단에서는 공개 여부가 자문행동에 영향을 주지 않았다. 이러한 결과를 바탕으로 연구의 의의와 더불어 후속 연구를 위한 제언을 논의하였다.
Structural insights into the molecular mechanism of ABC transporters
김수빈,진미선 한국구조생물학회 2016 Biodesign Vol.4 No.2
ABC (ATP-binding cassette) transporters mediate the translocation of a large variety of molecules across lipid bilayers andare directly driven by energy from ATP hydrolysis. Since the first crystal structure of an ABC transporter, the E. coli vitaminB12 transporter BtuCD, was reported in 2002, over thirty structures of ABC proteins in different functional states have beendetermined by X-ray crystallography or by single particle cryo-electron microscopy reconstruction. In this review, structuraldetails of ABC transporters, the maltose transporter of Escherichia coli and the P-glycoprotein of Caenorhabditis elegans,are discussed to understand the molecular mechanism of ABC importers and exporters, respectively.
양식산 참조기(Larimichthys polyactis) (민어과) 자치어의 상대성장과 비늘 형성
김수빈,조정현,김진구 한국수산과학회 2023 한국수산과학회지 Vol.56 No.3
We investigated the relative growth and squamation of larvae and juveniles of cultured Larimichthys polyactis. Analysis of the relative growth of larvae and juveniles showed that their preanal length, head length, eye diameter, body depth, and snout length increased with growth. There was no significant chage in the relative growth. The ratio of preanus length to standard length (SL) increased rapidly until SL was approximately 12 mm, and then increased gradually. Cycloid scales first appeared on the lateral line, progressed to the abdominal cavity at 15.13 mm SL, and expanded to the occipital region, base of pectoral fin, and ventral region of the eye at 17.82 mm SL. At 18.03 mm SL, scales formed on the cheek, and those at the base of pectoral fin and in the abdominal cavity were connected to each other. At 19.06 mm SL, major part of the head was covered by scales, except near the lower jaw. Cycloid scales on the lateral line changed to ctenoid scales at the range of 31.71–32.24 mm SL, and those on the nape changed at the range of 69.02–70.84 mm SL. Our results may help to establish conservation and management strategy for Larimichthys polyactis aquaculture.