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대규모 LPWA기반 네트워크에서 분산된 주차 공간 관리서비스의 설계 및 구현
박신열 ( Shinyeol Park ),정종필 ( Jongpil Jeong ),박동범 ( Dongbeom Park ),박병준 ( Byungjun Park ) 한국정보처리학회 2018 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.7 No.10
Due to the development of cities and the increase of vehicles, effective control of parking space management service in cities is needed. However, the existing parking lot management system does not provide limited or convenient service in terms of space and time. In this paper, we propose distributed parking space management service based on large scale LPWA (Low-Power Wide-Area). The parking sensor collects parking space information from the parking lot and is transmitted over a low-power wide network. All parking data is processed and analyzed in the IoT cloud. Through a parking space management service system in all cities, users are given the temporal convenience of determining the parking space and the area efficiency of the parking space.
Mihyeon Park,Byungjun Park,Soyoung Park,Sangyoung Park,Myeongjong Kim,Sunjung Park J-INSTITUTE 2021 International Journal of Crisis & Safety Vol.6 No.4
Purpose: This study was attempted to find out the influencing factors of self-leadership in nursing college students. Method: This study is a descriptive research study to identify the correlation between family intimacy, interpersonal relationship tendency, communication ability, self-leadership and the factors influencing self-leadership. Data collection was conducted from June 7 to June 20, 2020, targeting 236 nursing universities located in Gyeonggi-do and Gangwon-do. Results: The subjects family intimacy, interpersonal tendency, communication ability, and self-leadership showed statistically significant correlations in the positive direction. As a result of multiple regression analysis, the F value of the regression model fit was statistically significant at 42.29(<.001). Factors influencing self-leadership were family intimacy, interpersonal relationship tendency, and communication ability. Conclusion: In order to help nursing students adapt to college life, it is necessary to develop self-leadership, which is an individual s inner ability, develop a curriculum that strengthens interpersonal skills, and develop curriculum and comparison programs to enhance coping methods.
Microstructure and Residual Stress of Metallic Thin Films According to Deposition Parameters
Byungjun Park,Youngman Kim 한국표면공학회 2002 한국표면공학회지 Vol.36 No.1
In general; the microstructure in thin films was known to evolve in similar manner according to the energy striking the condensing film at similar homologous temperature, Th for the materials of the same crystal structure. The fundamental factors affecting particle energy are a function of processing parameters such as working pressure, bias voltage, target/sputtering gas mass ratio, cathode shape, and substrate orientation. In this study, Al, Cu, Pt films of the same crystal structure of face centered cubic (FCC) have been prepared under various processing parameters. The influence of processing variables on the microstructures and residual stress states in the films has been studied.
ByungJun Park,오세규,이종민 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.8
Frequent changes in process dynamics make re-identification of a dynamic model prerequisite for sustainable application of model predictive control. When the process needs to comply with a particular operating range for product specification or safety requirement, the model should be re-identified in closed-loop. In addition to potentially poor exciting signal for the identification, another challenge is that many industrial processes are multi-rate systems whose variables have different sampling intervals. This paper proposes a re-identification method for dual-rate non-uniformly sampled systems under closed-loop with a MPC controller by lifting the original system. The proposed identification method provides accurate and realistic model compared to the model used before the identification is conducted. We also compare the identified model and the existing model by applying to MPC.
Closed-loop Multi-rate Identification with zone-MPC using Constrained Subspace Method
ByungJun Park,Se-Kyu Oh,Jong Min Lee 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
In many industrial processes, process variables have different sampling intervals and they are referred to as multi-rate (MR) systems. When these systems are controlled by model predictive control which is useful to control of constrained multivariable process, model mismatch can occur because of changing in process dynamics. Thus, identification of a new model is necessary. The new model should be identified in closed-loop if the process needs to comply particular operating range for product specification or safety requirement. In this paper, the re-identification problem of a MR system in a closed-loop with a MPC controller is addressed, considering the lifted system and known dynamic characteristics. In comparison with the existing approach, the proposed identification method provides more accurate and realistic model.
Creation of a Hybrid Scaffold with Dual Configuration of Aligned and Random Electrospun Fibers
Park, Suk-Hee,Kim, Min Sung,Lee, Byungjun,Park, Jean Ho,Lee, Hye Jin,Lee, Nak Kyu,Jeon, Noo Li,Suh, Kahp-Yang American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.4
<P>A novel hybrid construct was developed by combining aligned fibers (AFs) and random fibers (RFs) to form a scaffolding system. Homogeneous fiber-based structures were fabricated by electrospinning, which produced both random and aligned fiber mats depending on the collection method. The upper part of the scaffold contained an AF layer, which possessed a well-organized configuration that provided uniaxial topographic guidance. For mechanical stability and support, the lower part of the scaffold was composed of an RF layer. Despite the presence of randomly distributed RFs, desirable alignment and differentiation could be achieved in cultured C2C12 myoblasts by controlling the density of AF layer. The fibrous structure of the hybrid scaffold also exhibited high porosity and therefore reasonable permeability. Owing to the structural stability provided by the underlying RFs, the cell-laden fibrous scaffolds were amenable to physical manipulation, such as multilayering. Collectively, the morphological features and manipulable architecture of the developed scaffolds suggest that they would perform well in practical applications.</P>