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탈황석고 정제방법 및 골재 종류 변화가 고로슬래그 미분말 다량치환 모르타르의 품질에 미치는 영향
김민상,이동윤,한천구 청주대학교 산업과학연구소 2017 産業科學硏究 Vol.35 No.1
This study aimed to analyzed the refining methods and replacement ratios of desulfurized gypsum from high volume blast furnace slag mortar and the engineering characteristics of cement mortar in relation to aggregate kinds. As factors of the experiment, in case of desulfurized gypsum depending on the refining method Raw material, 0.3 mm Sieving, 500℃ Heating were used, and the replacement ratios were set at 5 levels of 0, 5, 10, 15, and 20 %. For aggregate kinds, natural fine aggregate and recycled fine aggregate were used and compared, respectively. Overall, the best refining method of desulfurized gypsum was found to be 0.3 mm sieving analysis and within 5 % of replacement ratios the aggregate was best for natural fine aggregate considering flow, air contents, and compressive strength
Endosomal pH-destabilized PGA-PCL block copolymer micelle
김민상,카살라,Guang Jin Im,김봉섭,Doo Sung Lee 한국생체재료학회 2009 생체재료학회지 Vol.13 No.3
Poly(L-glutamic acid)-poly(ε-caprolactone) diblock copolymers were prepared using ring opening polymerization. The diblock copolymers were characterized by 1H-NMR, gel permeation chromatography and FT-IR. Endosomal pH-destabilized nanoparticles were prepared from dialysis method and their micellar structure was confirmed by dynamic light scattering and transmission electron microscopy. In this study, the method of fabrication and pHdependent structural changes of the diblock copolymer were investigated. pH-Dependent changeable nanoparticles may be helpful for intracellular delivery in drug delivery systems.
"라즈베리파이 카메라를 활용한 이미지 분석 기반 스마트 윈도우 착색 조절 자동화 시스템"
김민상,안현식,임성민,장은정,이나경,허준혁,강인구,권지현,이준영,김하영,김동수,윤종호,최윤석 한국전기전자학회 2024 전기전자학회논문지 Vol.28 No.1
"본 논문에서는 라즈베리파이 카메라와 함수 발생기를 활용하여 이미지에서 휘도를 분석하고 이를 바탕으로 전압을 인가하여 스마트 윈도우에 착색을 통해 광 투과를 조절할 수 있는 자동화 시스템을 제안한다. 기존 휘도 측정에 사용되는 휘도계는 가격대가 높고사용자의 불필요한 움직임을 요구해 실생활에서 활용하기 어렵다. 그러나 사진 촬영 후 Python Open Source Computer Vision Library (OpenCV)를 활용한 이미지에서의 휘도 분석은 저렴하고 휴대가 간편하여 실생활에서 쉽게 응용할 수 있다. 이 시스템을스마트 윈도우가 적용된 환경에 사용하여 창호의 휘도를 검출하였다. 이미지의 휘도를 바탕으로 스마트 윈도우의 착색 조절을 통해창호의 휘도를 감소시켜 재실자는 쾌적한 시 환경을 구축할 수 있다." "In this paper, we propose an automated system. It utilizes a Raspberry Pi camera and a function generator to analyze luminance in an image. Then, it applies voltage based on this analysis to control light transmission through coloring smart windows. The existing luminance meters used to measure luminance are expensive and require unnecessary movement from the user, making them difficult to use in real life. However, after taking a photography, luminance analysis in the image using the Python Open Source Computer Vision Library (OpenCV) is inexpensive and portable, so it can be easily applied in real life. This system was used in an environment where smart windows were applied to detect the luminance of windows. Based on the brightness of the image, the coloring of the smart window is adjusted to reduce the brightness of the window, allowing occupants to create a comfortable viewing environment."
GOCI-II 태양광 보정시스템을 활용한가시 채널 복사 보정 개선 및 센서 안정성 분석
김민상,박명숙,안재현,강금실 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.6
Radiometric calibration is a fundamental step in ocean color remote sensing since the step toderive solar radiance spectrum in visible to near-infrared wavelengths from the sensor-observedelectromagnetic signals. Generally, satellite sensor suffers from degradation over the mission period, whichresults in biases/uncertainties in radiometric calibration and the final ocean products such as water-leavingradiance, chlorophyll-a concentration, and colored dissolved organic matter. Therefore, the importance ofradiometric calibration for the continuity of ocean color satellites has been emphasized internationally. Thisstudy introduces an approach to improve the radiometric calibration algorithm for the visible bands of theGeostationary Ocean Color Imager-II (GOCI-II) satellite with a focus on stability. Solar Diffuser (SD)measurements were employed as an on-orbit radiometric calibration reference, to obtain the continuousmonitoring of absolute gain values. Time series analysis of GOCI-II absolute gains revealed seasonalvariations depending on the azimuth angle, as well as long-term trends by possible sensor degradationeffects. To resolve the complexities in gain variability, an azimuth angle correction model was developedto eliminate seasonal periodicity, and a sensor degradation correction model was applied to estimate nonlineartrends in the absolute gain parameters. The results demonstrate the effects of the azimuth anglecorrection and sensor degradation correction model on the spectrum of Top of Atmosphere (TOA) radiance,confirming the capability for improving the long-term stability of GOCI-II data.
남해 실해역 시험 기반 수중음향채널 경로손실에 관한 연구
김민상,이태석,조용호,임태호,고학림,Kim, Min-Sang,Lee, Tae-Seok,Cho, Yong-Ho,Im, Tae-Ho,Ko, Hak-Lim 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.3
최근 수중 자원개발, 재난 감시 및 국방에 관련하여 수중 통신에 대한 연구가 활발히 진행 중이다. 무선통신 시스템 설계에서 경로손실은 주어진 통신 링크에 대한 수신 전력 레벨을 계산하여 통신 신뢰성을 보장하는데 필요한 링크 예산을 도출하기 위한 중요한 정보이다. 수중음향채널은 각 해역에 따라 수온, 수심, 파고, 조류, 탁도 등에 의해 서로 다른 특성을 보이며, 각 해역별 수중음향채널의 경로손실은 서로 다른 특성을 갖는다. 따라서 수중음향 통신 시스템개발을 목적으로 하는 전 세계의 여러 연구기관에서는 다양한 해역에서 수중음향채널에 대한 연구가 활발히 진행되고 있다. 하지만 국내는 아직까지 수중음향채널의 경로손실에 대한 연구결과가 매우 부족하다. 따라서 본 연구에서는 남해 거제도 천해역의 실해역 측정을 통해 경로손실을 추정하였으며, 기존 연구에서 제안한 경로손실 수식에 남해의 환경정보를 적용하여 도출한 결과를 비교하여 그 차이를 확인하였다. Recently, studies on underwater communication, related to the development of underwater resources, disaster monitoring and defense, have been actively carried out. In the design of wireless communication systems, path loss is the most important information to derive a link budget that is required to guarantee communication reliability by calculating received power level for the given communication link. The underwater acoustic channel have different characteristics according to geographical location and relevant environmental factors such as water temperature, depth, wave height, algae, and turbidity. Subsequently, many research institutes aiming to develop underwater acoustic communication systems are researching actively on the underwater acoustic channels in various sea areas. In Korea, however, studies on the path loss of the acoustic channel are still insufficient. Therefore, in this study, the path loss of the acoustic channel are studied based on measurement data of the at-sea experiment conducted at Geohae-do, southern sea of Korea.