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박민석,조병완 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 논문집 Vol.10 No.2
교량의 설계에 있어서 정확한 하중의 산정은 교량의 안전성 확보에 가장 핵심적인 사항이며 향후 유지관리 측면에서도 매우 중요하다. 교량구조물에서 차량에 의한 하중효과는 주로 활하중(충격하중 포함) 및 피로하중으로 나타난다. 이들 하중의 정형화를 위해서는 실제 교량상을 주행하는 중차량의 중량 및 통행특성을 정확히 파악하는 것이 중요하다. 이를 위해서 주행중인 차량을 정지시키지 않고 중량을 계측할 수 있는 시스템(Bridge Weigh-In-Motion, BWIM)의 개발이 필요하다. 본 연구에서는 다양한 기능을 갖는 BWIM시스템을 국내실정에 맞게 개발하고 이를 고속도로상의 교량에서 검증하였다. In the design of bridges, exact evaluation of traffic loading is very important for the safety and maintenance of bridges. In general, traffic loading is represented by live load (including impact load) and fatigue load. For exact evaluation of traffic loading, it is important to get reliable and comprehensive truck data including the traffic and weight information. It requires the development of Bridge Weigh-In-Motion (BWIM), which measures the truck weights without stopping the traffic. Objectives of the study is (1) to develop the BWIM system, (2) to verified the system in bridges in Highways.
ATCIS-ǁ의 사용이 의무적인 사용자의 인식이 심적 채택과 사용에 미치는 영향
박민석,박준성,유준우,박희준 한국품질경영학회 2022 품질경영학회지 Vol.50 No.3
Purpose: The purpose of this study is to propose useful suggestions by analyzing causal effect relationship between perceived usefulness (PU), perceived ease-of-use (PEOU), symbolic adoption (SA) which have four constructs, and ATCIS-ǁ usage in mandatory context. Methods: Based on prior research, a research model was constructed using the variables of Technology Acceptance Model (TAM), the symbolic adoption theory, and the post-adoptive behavior variables. A structured questionnaire was conducted for those who use ATCIS-ǁ in Republic of Korea Army (ROKA), and a total of 183 usable responses were collected and empirically analyzed using SmartPLS 3.3.9. Results: The results of this study are as follows; PEOU have a significant effect on PU and two constructs of SA (heightened enthusiasm, effort worthiness). PU have a significant effect on every construct of SA (heightened enthusiasm, mental acceptance, effort worthiness, use commitment). In addition, it was found that heightened enthusiasm have a significant effect on both expanded usage and exploratory usage. Also, mental acceptance and use commitment have a significant effect on exploratory usage. Conclusion: The findings of this empirical study have implications for proposing SA can explain mandated user’s behavior and giving possible way that improve organization performance which adopt Information System (IS) by motivating end-user to extend IS’s feature and explore new ways of using IS at work.
박민석,조제훈,이순용,권영근,정경영 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.6
This research presents a novel methodology for measuring the complex permittivity of a material under test (MUT) in a millimeter-wave (mmWave) band by using two rectangular waveguide adapters. Contrary to the conventional Nicolson-Ross-Weir (NRW) method, the proposed complex permittivity measurement method does not require a material fabrication process for exact MUT insertion into a waveguide. In our complex permittivity measurement, simple commercial waveguide adapters are employed instead of large flange structures. The proposed complex permittivity measurement of a non-destructive MUT is achieved by combining the NRW method, the Gaussian weighting moving average filtering technique, a full-wave electromagnetic analysis, and an optimization technique. Furthermore, the proposed methodology is validated by fabricating a Teflon-based MUT and by measuring the complex permittivity of the MUT in the Ka band (26.5–40 GHz). The results indicate that the proposed methodology exhibits good agreement with the data sheet.
LaNiO<sub>3</sub>의 (100)배향성이 Pb(Zr,Ti)O<sub>3</sub> 박막의 결정성장과 강유전성에 미치는 영향
박민석,서병준,유영배,문병기,손세모,정수태,Park, Min-Seok,Seo, Byung-Joon,Yoo, Young-Bae,Moon, Byung-Kee,Son, Se-Mo,Chung, Su-Tae 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.4
Pb(Zr,Ti)O₃[PZT] thin films were prepared on a highly (100) oriented LaNiO₃[LNO] and a randomly oriented LNO by sol-gel process. The PZT thin films on a highly (100) oriented LNO show a high (100) crystal orientation (F=100 %), those on a randomly oriented LNO show a random crystal orientation (F=60 %). All the PZT layer have a flat and dense microstructure with large columnar grains and their grain size are 25 nm. In the ferroelectric curves at electric field of 40 kV/cm, a highly (100) oriented PZT/LNO samples show coercive field, E/sub c/=10 kV/cm and remanent polarization, P/sub r/=14.5 μC/㎠, while a randomly oriented PZT/LNO sample show E/sub c/=10 kV/cm and P/sub r/=5.4 μC/㎠.
반원형 고리 슬롯을 이용한 평판형 위성방송 수신 안테나
박민석,리화,박동희,안병철,Park Min-Seok,Lee Hua,Park Dong-Hee,Ahn Bierng-Chearl 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.12
본 논문에서는 반원고리 모양의 슬롯을 이용한 평판형 위성방송 수신 안테나를 제안하였다. 안테나의 복사소자는 스트립 다이폴에 의해 급전된 한 쌍의 반원 고리형 슬롯으로서 직사각형 슬롯보다 더 넓은 주파수 대역폭을 가진다. 안테나를 저가로 구현하기 위해 2장의 구리필름과 발포 플라스틱 시트를 사용하였다. 스트립 선로 T-접합 전력 분배기를 사용하여 $16{\times}16$ 배열 안테나를 설계하였다. 설계된 안테나를 제작 측정한 결과 11.7~12.8 GHz 대역에서 28.0~29.5 dBi의 이득을 얻었다. In this paper, we proposed a flate-plate antenna employing semi-annular slots for satellite broadcast reception. The radiating element of the antenna is dual annular slots fed by a strip dipole, which have a wider bandwidth than the rectangular slot. A $16{\times}16$ array antenna is designed using stripline T-junction power dividers. Measurements of the fabricated antenna show a gain of 28.0$\~$29.5 dB in 11.7$\~$12.8 GHz frequency range.
박민석,신경재 대한건축학회지회연합회 2008 대한건축학회지회연합회 학술발표대회논문집 Vol.2008 No.1
There are several methods for strengthening the RC beams such as by using steel plate, carbon fiber plate, tendon and steel bar. This paper is an analytical study for strengthening RC beams with the high-strength bars. When strengthened RC beam reaches the yield point, the internally reinforced rebars reach the yield point, but the externally reinforced high-strength bars may not reach the yield point. In general, the strain value of the externally reinforced high-strength bars show less than that of the internally reinforced rebars. This phenomenon must be considered in the design process. If the externally reinforced high-strength bar is yielded, the design process becomes much simpler. The purpose of this study is to provide the basic data of the design equation considering the geometry of bars and initial stress. The purpose of this study is to induce to be yielded by high-strength bars by controlling geometry of high-strength bars and initial stress.