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| 1 | Influence of Coanda surface curvature on performance of bladeless fan显示文摘The unique Coanda surface has a great influence on the performance of bladeless fan.However,there is few studies to explain the relationship between the performance and Coanda surface curvature at present.In order to gain a qualitative understanding of effect of the curvature on the performance of bladeless fan,numerical studies are performed in this paper.Firstly,three-dimensional numerical simulation is done by Fluent software.For the purpose to obtain detailed information of the flow field around the Coanda surface,two-dimensional numerical simulation is also conducted.Five types of Coanda surfaces with different curvature are designed,and the flow behaviour and the performance of them are analyzed and compared with those of the prototype.The analysis indicates that the curvature of Coanda surface is strongly related to blowing performance,It is found that there is an optimal curvature of Coanda surfaces among the studied models.Simulation result shows that there is a special low pressure region.With increasing curvature in Y direction,several low pressure regions gradually enlarged,then begin to merge slowly,and finally form a large area of low pressure.From the analyses of streamlines and velocity angle,it is found that the magnitude of the curvature affects the flow direction and reasonable curvature can induce fluid flow close to the wall.Thus,it leads to that the curvature of the streamlines is consistent with that of Coanda surface.Meanwhile,it also causes the fluid movement towards the most suitable direction.This study will provide useful information to performance improvements of bladeless fans. | LI Guoqi HU Yongjun JIN Yingzi Toshiaki Setoguchi Heuy Dong Kim | 2014 | Journal of Thermal Science2014，23，5： | 2 |
| 2 | Spatial phase-shifting interferometry with compensation of geometric errors based on genetic algorithm(Invited Paper)显示文摘We propose a novel spatial phase-shifting interferometry that exploits a genetic algorithm to compensate for geometric errors. Spatial phase-shifting interferometry is more suitable for measuring objects with properties that change rapidly in time than the temporal phase-shifting interferometry. However, it is more susceptible to the geometric errors since the positions at which interferograms are collected are different. In this letter, we propose a spatial phase-shifting interferometry with separate paths for object and reference waves. Also, the object wave estimate is parameterized in terms of geometric errors, and the error is compensated by using a genetic algorithm. | Joonku Hahn Hwi Kim Yongjun Lim Eun-Hee Kim Byoungho Lee | 2009 | Chinese Optics Letters2009，7，12： | 2 |
| 3 | Biocidal polystyrene hydantoin beads 2:control of chlorine loading显示文摘 | CHEN Yongjun WORLEY S D KIM Jangho | | 0，，： | 1 |
| 4 | 'An Explorative Study of Korean Consumer Participation inVirtual Brand Communities in Social Network Sites' 显示文摘 | Yongjun Sung Yoojung Kim Ohyoon Kwon Jangho Moon | | Journal of Global Marketing0，2010，： | 1 |
| 5 | An Explorative Study of Korean Consumer Participation in Virtual Brand Communities in Social Network Sites显示文摘 | Sung Yongjun Kim Yoojung Kwon Ohyoon | 2010 | Journal of Global Marketing2010，23，5： | 1 |
| 6 | Heat transfer and bubble properties in three-phase circulating fluidized beds 显示文摘 | CHO Yongjun KIM Sajung NAM Seokhee | 2001 | Chemical Engineering Science2001，56，21： | 1 |
| 7 | Effects of alloying elements on microstructure and protectiveproperties of Al2O3 coatings formed on aluminum alloy substrates by plasma electrolysis 显示文摘 | OH Yongjun MUN Jung-I1 KIM Jung-Hwan | 2009 | Surface & coat- ings Technology2009，204，： | 1 |
| 8 | A model for knowledge transfer in a multi-agent organization based on lattice kinetic model显示文摘A study on knowledge transfer in a mutli-agent organization is performed by applying the basic principle in physics such as the kinetic theory.Based on the theoretical analysis of the knowledge accumulation process and knowledge transfer attributes,a special type of knowledge field(KF)is introduced and the knowledge diffusion equation(KDE)is developed.The evolution of knowledge potential is modeled by lattice kinetic equation and verified by numerical experiments.The new equation-based modeling developed in this paper is meaningful to simulate and predict the knowledge transfer process in firms.The development of the lattice kinetic model(LKM)for knowledge transfer can contribute to the knowledge management theory,and the managers can also simulate the knowledge accumulation process by using the LKM. | WU Weiwei MA Qian LIU Yexin KIM Yongjun | 2020 | Journal of Systems Engineering and Electronics2020，31，1： | 0 |
| 9 | Blockchain-Based Trusted Electronic Records Preservation in Cloud Storage显示文摘Cloud storage represents the trend of intensive,scale and specialization of information technology,which has changed the technical architecture and implementation method of electronic records management.Moreover,it will provide a convenient way to generate more advanced and efficient management of the electronic data records.However,in cloud storage environment,it is difficult to guarantee the trustworthiness of electronic records,which results in a series of severe challenges to electronic records management.Starting from the definition and specification of electronic records,this paper firstly analyzes the requirements of the trustworthiness in cloud storage during their long-term preservation according to the information security theory and subdivides the trustworthiness into the authenticity,integrity,usability,and reliability of electronic records in cloud storage.Moreover,this paper proposes the technology framework of preservation for trusted electronic records.Also,the technology of blockchain,proofs of retrievability,the open archival information system model and erasure code are adopted to protect these four security attributes,to guarantee the credibility of the electronic record. | Zhiliang Deng Yongjun Ren Yepeng Liu Xiang Yin Zixuan Shen Hye-Jin Kim | 2019 | Computers, Materials & Continua2019，，1： | 0 |
| 10 | An Efficient Attention-Based Strategy for Anomaly Detection in Surveillance Video显示文摘In the present technological world,surveillance cameras generate an immense amount of video data from various sources,making its scrutiny tough for computer vision specialists.It is difficult to search for anomalous events manually in thesemassive video records since they happen infrequently and with a low probability in real-world monitoring systems.Therefore,intelligent surveillance is a requirement of the modern day,as it enables the automatic identification of normal and aberrant behavior using artificial intelligence and computer vision technologies.In this article,we introduce an efficient Attention-based deep-learning approach for anomaly detection in surveillance video(ADSV).At the input of the ADSV,a shots boundary detection technique is used to segment prominent frames.Next,The Lightweight ConvolutionNeuralNetwork(LWCNN)model receives the segmented frames to extract spatial and temporal information from the intermediate layer.Following that,spatial and temporal features are learned using Long Short-Term Memory(LSTM)cells and Attention Network from a series of frames for each anomalous activity in a sample.To detect motion and action,the LWCNN received chronologically sorted frames.Finally,the anomaly activity in the video is identified using the proposed trained ADSV model.Extensive experiments are conducted on complex and challenging benchmark datasets.In addition,the experimental results have been compared to state-ofthe-artmethodologies,and a significant improvement is attained,demonstrating the efficiency of our ADSV method. | Sareer Ul Amin Yongjun Kim Irfan Sami Sangoh Park Sanghyun Seo | 2023 | Computer Systems Science & Engineering2023，46，9： | 0 |
| 11 | Effects of Perforation Number of Blade on Aerodynamic Performance of Dual-rotor Small Axial Flow Fans显示文摘Compared with single rotor small axial flow fans, dual-rotor small axial flow fans is better regarding the static characteristics. But the aerodynamic noise of dual-rotor small axial flow fans is worse than that of single rotor small axial flow fans. In order to improve aerodynamic noise of dual-rotor small axial flow fans, the pre-stage blades with different perforation numbers are designed in this research. The RANS equations and the standard k-ε turbulence model as well as the FW-H noise model are used to simulate the flow field within the fan. Then, the aerodynamic performance of the fans with different perforation number is compared and analyzed. The results show that:(1) Compared to the prototype fan, the noise of fans with perforation blades is reduced. Additionally, the noise of the fans decreases with the increase of the number of perforations.(2) The vorticity value in the trailing edge of the pre-stage blades of perforated fans is reduced. It is found that the vorticity value in the trailing edge of the pre-stage blades decreases with the increase of the number of perforations.(3) Compared to the prototype fan, the total pressure rising and efficiency of the fans with perforation blades drop slightly. | HU Yongjun WANG Yanping LI Guoqi JIN Yingzi Toshiaki Setoguchi Heuy Dong Kim | 2015 | Journal of Thermal Science2015，24，2： | 0 |
| 12 | Dehydro-Diels-Alder reaction and diamondization of bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6)显示文摘Dehydro-Diels-Alder(DDA)reaction is a textbook reaction for preparing six-membered rings in solution but is scarcely seen in solid-state synthesis.In this work,using multiple characterization techniques,we demonstrate that the bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6) might experience a DDA reaction at room temperature and high pressure between 5.5 and 7.4 GPa.Above 17.0 GPa,it is found that the bonding conversion from the intramolecular sp^(2) to the intermolecular spa occurred,in the form of pressure-induced diamondization.The recovered samples from 20.0 and 36.1 GPa showed incomplete reversibility,while the decompression-induced graphitization of glassy carbon was observed during decompression from 46.5 GPa.The electrochemical impedance spectroscopy results indicated that the transport properties changed from grain boundary dominant to grain dominant due to the DDA reaction and the grain boundary effect disappeared as the intermolecular sp3 bonding building-up and carrier transmission channel formation above 17.0 GPa.The results in this study open a new route to construct the crystalline carbon materials with different transport properties. | Jinbo Zhang Manli Ma Rong Zhou Hongqiang Chu Xue Wang Shaojie Wang Huhu Tian Zhipeng Yan Mingtao Li Zhongyan Wu Bin Li Jiafeng Yan Lan Anh Thi Nguyen Rongxing Cao Guoqing Wu Xianghua Zeng Hao-Li Zhang Jaeyong Kim Lin Wang Yongjun Tian | 2022 | Nano Research2022，15，5： | 0 |
| 13 | Block Verification Mechanism Based on Zero-Knowledge Proof in Blockchain显示文摘Since transactions in blockchain are based on public ledger verification,this raises security concerns about privacy protection.And it will cause the accumulation of data on the chain and resulting in the low efficiency of block verification,when the whole transaction on the chain is verified.In order to improve the efficiency and privacy protection of block data verification,this paper proposes an efficient block verification mechanism with privacy protection based on zeroknowledge proof(ZKP),which not only protects the privacy of users but also improves the speed of data block verification.There is no need to put the whole transaction on the chain when verifying block data.It just needs to generate the ZKP and root hash with the transaction information,then save them to the smart contract for verification.Moreover,the ZKP verification in smart contract is carried out to realize the privacy protection of the transaction and efficient verification of the block.When the data is validated,the buffer accepts the complete transaction,updates the transaction status in the cloud database,and packages up the chain.So,the ZKP strengthens the privacy protection ability of blockchain,and the smart contracts save the time cost of block verification. | Jin Wang Wei Ou Osama Alfarraj Amr Tolba Gwang-Jun Kim Yongjun Ren | 2023 | Computer Systems Science & Engineering2023，45，5： | 0 |
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