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2. Brief Announcement: On the Limits of Parallelizing Convolutional Neural Networks on GPUs

Author

Pourghassemi, Behnam, Zhang, Chenghao, Lee, Joo Hwan, and Chandramowlishwaran, Aparna

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Neural and Evolutionary Computing
Abstract

GPUs are currently the platform of choice for training neural networks. However, training a deep neural network (DNN) is a time-consuming process even on GPUs because of the massive number of parameters that have to be learned. As a result, accelerating DNN training has been an area of significant research in the last couple of years. While earlier networks such as AlexNet had a linear dependency between layers and operations, state-of-the-art networks such as ResNet, PathNet, and GoogleNet have a non-linear structure that exhibits a higher level of inter-operation parallelism. However, popular deep learning (DL) frameworks such as TensorFlow and PyTorch launch the majority of neural network operations, especially convolutions, serially on GPUs and do not exploit this inter-op parallelism. In this brief announcement, we make a case for the need and potential benefit of exploiting this rich parallelism in state-of-the-art non-linear networks for reducing the training time. We identify the challenges and limitations in enabling concurrent layer execution on GPU backends (such as cuDNN) of DL frameworks and propose potential solutions., Comment: 3 pages, 1 figure, to be published in Proceedings of the 32nd ACM Symposium on Parallelism in Algorithms and Architectures (SPAA '20)

Published
2020

6. Changes in Spectral Reflectance, Photosynthetic Performance, Chlorophyll Fluorescence, and Growth of Mini Green Romaine Lettuce According to Various Light Qualities in Indoor Cultivation.

Author

Lee, Joo Hwan, Kwon, Yong Beom, Choi, In-Lee, Yoon, Hyuk Sung, Kim, Jidong, Kim, Yongduk, and Kang, Ho-Min

Subjects
CHLOROPHYLL spectra, SPECTRAL reflectance, BLUE light, LETTUCE, PHOTOBIOLOGY, LIGHT sources, PRINCIPAL components analysis, LEAF area
Abstract

Light quality can be stated to be the identity of an artificial light source, and although the response of light quality may vary depending on the crop, the effect is clearly visible and can produce various results depending on the combination of an artificial light source. This study investigated the spectral reflectance, photosynthetic performance, and chlorophyll fluorescence of mini green romaine lettuce based on light quality. Most parameters related to spectral reflectance showed the best results under blue light, and photosynthetic performance was more effective with mixed light than with single-colored light, among which blue + red (BR)-LED was the most suitable. Red light was ineffective, showing mostly low results in parameters of spectral reflectance and photosynthetic performance. In the case of chlorophyll fluorescence, the light quality influenced photomorphogenesis, resulting in increased leaf length and width with R- and quantum dot (QD)-LED, which expanded the leaf area and allowed for more external light to be captured (ABS/RC and TRo/RC). However, the ratio of electronized energy (ETo/RC) was low, and the amount of energy dissipated as heat (DIo/RC) was high. Consequently, the degree of electron acceptor reduction and overall photosynthetic performance (PIABS and PItotal) were lower compared to other light qualities. Additionally, the contrasting results of QD-LED and BR-LED were attributed to the form of red light and the presence or absence of far-red light when comparing spectra. Principal component analysis also clearly distinguished light qualities for photosynthesis and growth. Growth was increased by red (R)- and QD-LED, while photosynthetic performance was increased by BR- and blue (B)-LED. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Oxygen-Vacancy-Induced Antiferromagnetism to Ferromagnetism Transformation in Multiferroic Thin Films

Author

Li, Weiwei, Zhao, Run, Wang, Le, Tang, Rujun, Zhu, Yuanyuan, Lee, Joo Hwan, Cao, Haixia, Cai, Tianyi, Guo, Haizhong, Wang, Can, Ling, Langsheng, Pi, Li, Jin, Kuijuan, Zhang, Yuheng, Wang, Haiyan, Wang, Yongqiang, Ju, Sheng, and Yang, Hao

Subjects
Condensed Matter - Materials Science
Abstract

Oxygen vacancies (VOs) effects on magnetic ordering in Eu0.5Ba0.5TiO3-{\delta} (EBTO3-{\delta}) thin films have been investigated using a combination of experimental measurements and first-principles density-functional calculations. Two kinds of EBTO3-{\delta}thin films with different oxygen deficiency have been fabricated. A nuclear resonance backscattering spectrometry technique has been used to quantitatively measure contents of the VOs. Eu0.5Ba0.5TiO3 ceramics have been known to exhibit ferroelectric (FE) and G-type antiferromagnetic (AFM) properties. While, a ferromagnetic (FM) behavior with a Curie temperature of 1.85 K has been found in the EBTO3-{\delta} thin films. Spin-polarized Ti3+ ions, which originated from the VOs, has been proven to mediate a FM coupling between the local Eu 4f spins and were believed to be responsible for the great change of the magnetic ordering. Our work opens up a new avenue for developing FM-FE materials by manipulating the oxygen deficiency in AFM-FE multiferroics., Comment: 27pages,6 figures,2 tables,conference

Published
2013

21. SESH Framework: A Space Exploration Framework for GPU Application and Hardware Codesign

Author

Lee, Joo Hwan, Meng, Jiayuan, Kim, Hyesoon, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Jarvis, Stephen A., editor, Wright, Steven A., editor, and Hammond, Simon D., editor

Published
2014
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23. Frequency Sharing Method for High Frequency Ocean Surface Radar Using Matched Filtering and Orthogonal Waveforms

Author

Choi, In-Sik, Lee, Seung-Jae, Lee, Joo-Hwan, Chong, Young-Jun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kim, Tai-hoon, editor, Lee, Young-hoon, editor, and Fang, Wai-chi, editor

Published
2012
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24. IGC: An Image Genre Classification System

Author

Lee, Joo Hwan, Baik, Sung Wook, Kim, Kangseok, Jung, Changduk, Kim, Wonil, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Deng, Hepu, editor, Miao, Duoqian, editor, Lei, Jingsheng, editor, and Wang, Fu Lee, editor

Published
2011
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25. A Statistical Model of Relationship Between Affective Responses and Product Design Attributes for Capturing User Needs

Author

Bahn, Sangwoo, Lee, Cheol, Lee, Joo Hwan, Yun, Myung Hwan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Aykin, Nuray, editor

Published
2007
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26. Incorporating JND into the Design of Mobile Device Display

Author

Lee, Joo Hwan, Suh, Won Yong, Lee, Cheol, Jo, Jang Hyeon, Yun, Myung Hwan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Aykin, Nuray, editor

Published
2007
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27. Classification of Bluffing Behavior and Affective Attitude from Prefrontal Surface Encephalogram During On-Line Game

Author

Yun, Myung Hwan, Lee, Joo Hwan, Lee, Hyoung-joo, Cho, Sungzoon, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhang, David, editor, and Jain, Anil K., editor

Published
2005
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29. Effect of Pre-Storage CO 2 Treatment and Modified Atmosphere Packaging on Sweet Pepper Chilling Injury.

Author

Afolabi, Abiodun Samuel, Choi, In-Lee, Lee, Joo Hwan, Kwon, Yong Beom, Yoon, Hyuk Sung, and Kang, Ho-Min

Subjects
CONTROLLED atmosphere packaging, CARBON dioxide, PATIENT preferences, SWEET peppers, COLD storage
Abstract

The effect of 10% CO2 pre-storage treatment for 12, 24, and 48 h alongside modified atmosphere packaging (MAP) on chilling injury was determined in this study. This study found significant interactions between chilling injuries and cell membrane damage indicators. The results show that chilling injuries can be somewhat reduced by the use of CO2 treatment for sweet peppers. It was noticed that the fruit's respiration rate increased as the treatment duration increased immediately after the treatments, while the resultant did not affect the ethylene production rate, electrolyte leakage, or malondialdehyde. Similarly, after cold storage and on the final day, no really significant differences were shown in all those parameters except for the weight loss rate, chilling injury, calyx browning, and firmness, which were at the poorest state in the control group. Of all the treatments in this study, MAP appeared to be the best treatment, and preference may be given to the 24 h treatment of pretreated fruits. Weight loss, firmness, calyx browning, and chilling injury were maintained best in MAP due to the presence of CO2 and high humidity. [ABSTRACT FROM AUTHOR]

Published
2023
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