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Design of the High Light-efficiency LED Fusion Parts for Automatic assembly
Byung-kwon Moon(문병권),Sang-yong Choo(추상용),Jun-ho Bang(방준호 ),In-ho Ryu(유인호) 대한전기학회 2019 전기학회논문지 Vol.68 No.3
The manufacturing technology of LED fusion lighting used in direct under panel light has developed over time. However, due to the various sizes and designs, the manual processes are carried out in the main processes, and the defect rate in the automation line is rather high. In order to solve these problems, the design of the module power source of the LED fusion lighting where the defect frequently occurs was designed by changing the FR4 type structure in the existing wire type. Moreover, through optical characterization, the possibility of commercialization was confirmed by comparing with the authentication performance of high-efficiency energy equipment. In addition, by designing and developing the pallet loading jig used in the automatic assembly line, it is expected to automate the assembly line and reduce the defect rate. It will be widely used in the direct under panel light market by expanding compatibility with various LED lighting assembly systems.
박효진 ( Hyo-jin Park ),문병권 ( Byung-kwon Moon ) 전북대학교 과학교육연구소 2017 과학과 과학교육 논문지 Vol.42 No.1
The subsiding branch of the Hadley circulation accompanied by dry, warm and suppressed convection is associated with subtropical deserts. The tropical belt has widened for last decades as expanded in the width of Hadley cell. Here we investigate the variability of hemispheric boundaries with potential causes behind this widening. Observational analysis shows that the Northern and Southern Hemispheric boundaries have poleward moved by 0.56°/decade and 0.75°/decade, respectively. The Northern (Southern) expansion is closely related with the tropospheric cooling (warming) in tropics (high-latitudes). The tropical expansion is also linked to the dominant variabilities in the Pacific, La Nina and Pacific Decadal Oscillation (PDO). We conclude that global climate modes need to capture Hadley cell changes in response to the variations of the both meridional temperature gradient and sea surface temperature.
위지은 ( Jieun Wie ),문병권 ( Byung Kwon Moon ) 전북대학교 과학교육연구소 2012 과학과 과학교육 논문지 Vol.37 No.-
This note introduces the GrADS program that is used for access manipulation and visualization of earth science data. GrADC would offer both teachers and students the ability to recreate their own graphics shown in textbooks. Here the authors try to describe the simplest way to produce figures including weather maps mean sea surface temperature zonal mean winds and oceanic vertical temperature profiles. All sample figures are intentionally selected from a high school earth science II. Hopefully the readers would take a step forward to the earth scientific graphing.
기상청 국지 예보모델과 LUCY (Large scale urban consumption of energy)의 수도권 인공열 자료 비교
위지은 ( Jieun Wie ),문병권 ( Byung-kwon Moon ),변재영 ( Jae-young Byon ) 전북대학교 과학교육연구소 2020 과학과 과학교육 논문지 Vol.45 No.1
The anthropogenic heat (AH) released from human activities contributes to urban warming. Therefore, the reliability of urban climate forecasts may depend on the accuracy of prescribed anthropogenic heat in numerical weather prediction models. This study considers the Seoul metropolitan area (SMA), and compares the AH used in the Korea Meteorological Administration (KMA) local data assimilation and prediction system (LDAPS) to that in the large scale urban consumption of energy (LUCY) model. The annual mean AH of LDAPS (2.76 Wm<sup>-2</sup>) is much smaller than that of LUCY (55.85 Wm<sup>-2</sup>). The annual AH cycle of LDAPS shows a winter maximum and a summer minimum, while LUCY has a bimodal distribution with one peak in winter and a smaller peak in summer. There is a lack of weekly and diurnal variability in LDAPS AH. However, AH in the LUCY model shows a minimum over weekends due to the decline in human activities on these days and variation in the diurnal cycle, with a minimum around 04-05 local standard time and a broad maximum during the afternoon. Our results indicate that the prescribed AH in LDAPS is very small and lacks the sub-monthly variability to properly simulate the influence of AH on urban climate. Further improvements in AH might help to increase the reliability of KMA LDAPS for understanding the thermal balance of the SMA.
위지은 ( Jieun Wie ),문병권 ( Byung-kwon Moon ) 전북대학교 과학교육연구소 2021 과학과 과학교육 논문지 Vol.46 No.1
This study analyzes atmospheric conditions associated with the variability of particulate matter (PM10) concentration in Jeonju and its surrounding region, suggesting an urban environment suitable for PM10 reduction through modeling simulations. Analysis of the empirical orthogonal function of daily PM10 concentrations in Jeollabuk-do from 2012 to 2018 showed that the first mode was increased PM10 throughout Jeollabuk-do; the second mode was a dipole mode in which the concentration increased in the northwest region and decreased in the southeast region. The first mode is related to low wind speed and high pressure, and the second mode is affected by the north wind. The representative days of the two modes were selected, and modeling experiments with changing land use and building height were conducted. The experiments of increased building height and expanded urban area in Jeonju decreased the wind speed; however, the urban area experiments changed from urban to forest or rice fields in Jeonju increased wind speed. The wind speed change was more noticeable when the wind speed was faster, especially on the leeward side. The increase in wind speed decreased the atmospheric vertical stability and promoted vertical air circulation. The lowering of building height and the increase of trees and grassland would reduce PM10 damage in Jeonju.
정현채 ( Hyun-chae Jung ),문병권 ( Byung-kwon Moon ),위지은 ( Jieun Wie ),박효진 ( Hyo-jin Park ) 전북대학교 과학교육연구소 2017 과학과 과학교육 논문지 Vol.42 No.2
Debate continues about the impacts of biogeochemical processes on the oceanic mean state and interannual variability, since climate models show diverse simulation results. We investigate the biophysical impacts on the ocean climate using an global ocean general circulation model. The annual cycle in the tropical Pacific has been amplified due to biological processes. Global surface currents, particularly western boundary currents and Antarctic Circumpolar current, also have been strengthened. Furthermore, ocean model with biological module shows the larger amplitude of El Niño, which is resulted from the modulation of vertical baroclinic mode. Simple model experiments with three baroclinic modes indicate that the biological-induced changes in oceanic thermal structure act to amplify El Niño amplitude via altered vertical modes. The processes presented in this paper are preliminary and need to be validated using more comprehensive models.
박효진 ( Hyo Jin Park ),문병권 ( Byung Kwon Moon ) 전북대학교 과학교육연구소 2013 과학과 과학교육 논문지 Vol.38 No.1
This short note proposed a new teaching strategy for understanding the tropical easterly waves and its associated vertical motions. Similar to the upward and downward motions associated with mid-latitude baroclinic wave, the comparison of wind speed between gradient winds and geostrophic wind also provide us with a useful tool for easterly waves and vertical motions. Only a different point is that the easterly waves in tropics are mainly occurred low-level troposphere.
고등학교 과학과 지국과학 교과서의 평균자오면순환의 오류와 수정을 위한 제안
박효진 ( Hyo Jin Park ),문병권 ( Byung Kwon Moon ) 전북대학교 과학교육연구소 2013 과학과 과학교육 논문지 Vol.38 No.2
The purpose of this study is to correct a error in the mean meridional circulation (MMC) figures of the science textbooks. The Ferrel circulation from the 12 high school textbooks are shown in two different types in term of the direction of the upper branch in the circulation. The upper atmospheric flow associated with Ferrel cell from the 8 textbooks shows northerly (from the north to the south), but others southerly (from the south to the north). We calculate the MMC from the two observation data (ECMWF and NCEP). The Ferrell cell has sinking motion at 30°N and 30°S, relatively weak rising motion approximately near 60°. The mass continuity indicates that upper branch of the Ferrel cell should flow toward the equatorward. We also introduced the OpenGrADS software which enables teachers and students to create their own figures of MMC, thus, helps better understand the general circulation.