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Atomization characteristics of hairspray with various design parameters of spray vessel
( Huijun Kim ),( Junkyu Park ),( Sungwook Park ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This study was conducted to analyze the spray characteristics of aerosol sprays depending on various nozzle design parameters. In this study, actuator, valve geometry and propellant/product ratio were selected as variables for spray experiment. In aerosol spray vessels, product and liquefied propellant are present together. Therefore, product fluid was atomized by flash-boiling of propellant induced by sudden pressure drop. The atomization performance of a hair spray can be evaluated by SMD and droplet distribution. Droplet diameter and velocity are measured via PDPA(Phase Doppler Particle Analyzer) and macroscopic spray characteristics such as spray development and cone angle were investigated through spray visualization. ICCD (Intensified Charge Coupled Device) camera and Nd:YAG laser was used to take spray internal structure. Experimental results show how nozzle parameter affects spray characteristics. Image processing was done with MATLAB program to analyze captured image from ICCD camera. Actuator mainly affected spray cone angle rather than atomization characteristics. For example, increasing actuator orifice nozzle diameter and impellers made spray cone angle larger. Conversely, the valve design had an effect to atomization characteristics such as droplet diameter and propellant/product ratio affected both spray cone angle and atomization characteristics. In particular, the increase in vapor phase tap of valve and propellant/product ratio had a dramatic impact on the reduction in SMD.
A Bi-Target Based Mobile Relay Selection Algorithm for MCNs
( Huijun Dai ),( Xiaolin Gui ),( Zhaosheng Dai ),( Dewang Ren ),( Yingjie Gu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.11
Multi-hop cellular networks (MCNs) reduce the transmit power and improve the system performance. Recently, several research studies have been conducted on MCNs. The mobile relay selection scheme is a rising issue in the design of MCNs that achieves these advantages. The conventional opportunistic relaying (OR) is performed on the single factor for maximum signal-to-interference-plus-noise ratio (SINR). In this paper, a comprehensive OR scheme based on Bi-Target is proposed to improve the system throughput and reduce the relay handover by constraining the amount of required bandwidth and SINR. Moreover, the proposed algorithm captures the variability and the mobility that makes it more suitable for dynamic real scenarios. Numerical and simulation results show the superiority of the proposed algorithm in both enhancing the overall performance and reducing the handover.
New Public Key Encryption with Equality Test Based on non-Abelian Factorization Problems
( Huijun Zhu ),( Licheng Wang ),( Shuming Qiu ),( Xinxin Niu ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.2
In this paper, we present a new public key encryption scheme with equality test (PKEwET). Compared to other PKEwET schemes, we find that its security can be improved since the proposed scheme is based on non-Abelian factorization problems. To our knowledge, it is the first scheme regarding equality test that can resist quantum algorithm attacks. We show that our scheme is one-way against chosen-ciphertext attacks in the case that the computational Diffie-Hellman problem is hard for a Type-I adversary. It is indistinguishable against chosen-ciphertext attacks in the case that the Decisional Diffie-Hellman problem is hard in the random oracle model for a Type-II adversary. To conclude the paper, we demonstrate that our scheme is more efficient.
Huijun Yang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.9
In this paper, we research on the modern Internet of things system structure optimization methodology based on the information theory and the communication signal transmission model. We analyze the current IOT system from the following aspects. (1) Reliable delivery, that is, through some of the Internet and telecommunication network integration, it will send some information about the object accurately in real time; For the Internet of things, it is an integrated which is by a variety of network and the access and application technology of an integrated, at the same time it is also a can make the objects and people, nature and people as well as a platform for communication between objects and the objects. (2) The comprehensive perception which is to use some of the perception, capture and real-time measurement technology to information acquisition and access to an object with the sensing device can achieve data readout and data sent and no contact some automated to realize long-distance induction. (3) Intelligent processing, is one of the core content of the Internet of things, is to use some intelligent computing some analysis was carried out on large amount of information and data disposal, the Internet of things is able to intelligently control object by the computer network technology, micro processing technology, wireless communication technology and sensor technology product of development of fusion, therefore the Internet of things can be representative even instead of rational analysis. Through combining the information theory and the efficient signal transmission models, we optimize the current IOT architecture and the final experiment result indicates the feasibility of the proposed methodology.
Improvement of RocksDB Performance via Large-Scale Parameter Analysis and Optimization
Huijun Jin,최원기,최종환,성한승,박상현 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.3
Database systems usually have many parameters that must be configured by database administrators and users. RocksDB achieves fast data writing performance using a log-structured merged tree. This database has manyparameters associated with write and space amplifications. Write amplification degrades the databaseperformance, and space amplification leads to an increased storage space owing to the storage of unwanteddata. Previously, it was proven that significant performance improvements can be achieved by tuning thedatabase parameters. However, tuning the multiple parameters of a database is a laborious task owing to thelarge number of potential configuration combinations. To address this problem, we selected the importantparameters that affect the performance of RocksDB using random forest. We then analyzed the effects of theselected parameters on write and space amplifications using analysis of variance. We used a genetic algorithmto obtain optimized values of the major parameters. The experimental results indicate an insignificant reduction(-5.64%) in the execution time when using these optimized values; however, write amplification, spaceamplification, and data processing rates improved considerably by 20.65%, 54.50%, and 89.68%, respectively,as compared to the performance when using the default settings.
Huijun Wang,박태흡(Tae-Hub Park),김태형(Tae-Hyoung Kim),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Bearingless switched reluctance motors (SRM) have combined advantages of conventional SRM and magnetic bearings. Therefore in this paper based on novel structure of Bearingless SRM, an accurate mathematic model of radial force is deduced. Meanwhile in order to realize steady suspending, a novel radial force control method── Direct Instantaneous Radial Force Control (DIRFC) is presented. The effectiveness of new model and DIRFC is proved by the simulation results.
Analysis of the Influence of Tension on the Fiber Winding Track
Huijun Li,Shuxiang Guo,Xiufen Ye 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
In this paper, in order to solve the question of the winding tracks affected by tension leading to pipeline performance degradation, we analyze the tension on the wound composite pipes and establish a winding model about six degrees of freedom robotic arm and find the solver of the kinematic equations. We designed a winding track and established on a MATLAB and ADAMS co-simulation platform. The winding track affected by the tension is simulated. According to the results, we can obtain the force of the joints of the robot. Taking these force data as the compensation of the joint force, the robot can do the desired track overcoming the winding tension.
Radial Force Control of a Novel Hybrid Pole BLSRM
Huijun Wang,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6
This paper presents a novel hybrid pole BLSRM (Bearingless Switched Reluctance Motor) and its radial force control scheme. The proposed hybrid pole BLSRM has separated radial force poles and rotating torque poles. According to the FEM analysis, the proposed BLSRM has an excellent linear characteristic of radial force and controllability that is independent from the torque current. The radial force can be produced by the radial force winding which is wound at the separated radial force poles. The rotating torque is produced by the excitation current of the torque windings which are wound at the torque pole. The proposed radial force control scheme is independent of the phase torque winding current. A simple PID controller and look-up table are used to maintain a constant rotor air-gap. The proposed BLSRM and its radial force control scheme are verified by FEM analysis and experimental tests.