• Journal of the Korean Solar Energy Society
• /
• v.23 no.3
• /
• pp.23-28
• /
• 2003

The purpose of this study is to procure basic data to be used for solar power plant and concentrating collector designs. Site elevation is one of the major factors which influences the incoming insolation to the earth surface. Because the nonpermanent gases such as ozone, water vapor are unmixed components of the atmosphere and their concentrations are the function of height, the site elevation effects the relative proportion of the atmospheric constituents. We have measured solar radiation on Jiri Mt. (1,400m) and in Gurye area(115m) at the near same latitude. These values were then compared to obtain their characteristics and to investigate the potential for the solar utilization for both high and low elevated areas. From the experimental results, we concluded that 1) Daily mean horizontal global radiation and normal beam radiation on Mt. Jiri are 9.5%, and 35.3% higher than Gurye area respectively for a clear day. 2) A significant difference in atmospheric clearness index is observed between Mt. Jiri and Gurye areas.

• Journal of the Korean Solar Energy Society
• /
• v.39 no.4
• /
• pp.11-24
• /
• 2019

The total solar irradiation on horizontal surfaces is separated into the beam and diffuses components. Although horizontal global irradiance is a commonly measured parameter for many sites, horizontal diffuse irradiance is not so readily obtainable. For such sites that measure global irradiation alone, a simple but reasonably accurate method is required to estimate diffuse irradiance from its global counterpart. This study investigates the applicability of correlation coefficients models correlating hourly diffuse and beam fraction and hourly clearness index in Daejeon. The three diffuse to global correlation coefficients models (Orgill and Holland model, CIBSE Guide J model, and Erbs et al. model) are selected and the three modified beam to global correlation coefficients models are generated. MBE, RMSE, r-squared of Daejeon and Daejeon boundary site-fitted models are compared with the case of original coefficients. The comparison result shows that the beam and diffuse to global solar irradiation correlation coefficients models with boundary site-fitted coefficients are best suitable for Daejeon. Further researches will be conducted to find the boundary site-fitting method using measured data of other cities and correlation coefficients models using solar altitude, cloud cover, and sunshine duration.

• Journal of the Architectural Institute of Korea Planning & Design
• /
• v.35 no.9
• /
• pp.3-9
• /
• 2019

Modern cities have been clustered with spaces defined by specific functions, while standardized with well-defined areas. The monopoly of the function reduces the publicity of the space and hinders people's daily communication. Street also be overwhelmed by the function of being a "passage", traditional streets were losing their liminality. In fact, the street was a place of meeting, a place of events, and a place of freedom to broaden the choices of behavior. The freedom to stop or walk on one'sits own, be attracted by unforeseen events that are available on traditional streets, has become rare on the streets of big cities. Life has become dull and monotonous, too, through the modelling of the street system. Cities have become grim as communities are cut off and fragmented. In today's big cities, public attention to the liminality of the traditional streets need to be aroused so that people could gather freely and have a festival time.

• The Journal of Korean Medicine
• /
• v.43 no.1
• /
• pp.42-59
• /
• 2022

Objectives: This study was done to establish the anatomical meaning of the term 'Geun(筋)'. Methods: Through analysis of 《HwangJeNaeGyeong(黃帝內經)》, the meaning of 'Geun(筋)', 'GeunMag(筋膜)', 'Yug(肉)', and 'Gi(肌)' were established. Based on analysis, the anatomical meaning of the 'Meridian-muscle(經筋)' was studied by comparing it with anatomy. Results & Conclusions: 'Gyeong(經)' is recognized as a metaphysical expression and "Geun(筋)" means myofascia in anatomy. The concept of 'Geun(筋)' includes the epimysium and perimysium, as well as tendons and ligaments, which are extensions of these. 'Fascia', refers to the fascia of the whole body, and also appertain to 'Geun(筋)'. 'Yug(肉)' means endomysium, muscle fiber, and adipose tissue and layer. The word 'GeunMag(筋膜)' used in the 《HwangJeNaeGyeong(黃帝內經)》 means anatomically a 'tendon'. Therefore, 'Muscle' should be translated as 'GeunYug(筋肉)' in Traditional medicine. 'Meridian-muscle(經筋)' can be defined as the longitudinal muscle and fascia system, which is the basis of whole body encompassing dynamics.

• The Journal of Korean Medicine
• /
• v.44 no.1
• /
• pp.56-64
• /
• 2023

Objectives & Methods: The entire ≪Lingshu·Jingjin≫ content was analyzed to find repetitive patterns, as well as to analyze commonly used terms. Through this, the guidelines for interpretation were presented. Results & Conclusions: ≪Lingshu·Jingjin≫ is not a question-and-answer format, but a simple enumerated narrative format. There is no part corresponding to the introduction, only the descriptions of 12 individual Meridian-muscle exist. Each Meridian-muscle is divided into 'Flow of Muscle Mechanics(流走)' part and 'Diseases' part, and 'Flow of Muscle Mechanics' of each Meridian-muscle can be divided into 'Main Flow' and 'Branch'. 'Main Flow' is the most central 'Flow' in each 'Meridian-muscle', and 'Branch' is the part where 'Main Flow' ends and the description of another 'Flow' begins. 'Branch' has different expressions according to the importance. The expression also varies depending on the dynamics. 'Meridian-muscle' should be interpreted based on this.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2017.04a
• /
• pp.125-125
• /
• 2017

본 연구에서 원추형 태양열 집광기의 흡수관 표면의 흑색 도색 여부에 따른 효율분석을 수행하였다. 원추형 집광기 시스템은 열 손실 최소화 및 집광비가 우수한 $45^{\circ}$의 원추각을 갖는 원추형 집광기를 설계 및 제작하였다. 원추형 태양열 집광시스템은 열매체 축열을 위한 온도센서가 내장된 축열조와 태양에너지를 집열시키는 원추형 집광기, 유량측정을 위한 유량계, 열매체의 강제순환을 위한 펌프로 구성되어있다. 또한 지속적인 태양추적을 위해 2축 태양 추적 장치를 설치하였다. 흡수관은 원추형 집광기의 중심부에 설비되었으며, 열매체의 순환을 위해 이중 열교환기 구조로 제작되었다. 흡수관의 길이는 열 손실을 최소화하기 위하여 집광기의 높이와 동일하게 설계하였다. 원추형 집광시스템의 작동유체인 물은 펌프에 의해 흡수관과 축열조를 강제순환 하게되고, 용량이 70L인 축열조에 흡수관으로부터 흡수된 태양 복사열이 저장된다. 원추형 집광시스템의 성능실험은 청명한 날 유량 2L/min, 4L/min, 6L/min에 대해 수행되었으며, 집열효율을 계산하여 비교 및 분석하였다. 흑색으로 도색된 흡수기를 부착한 원추형 집광시스템의 집열효율은 82.25%로 나타났으며, 무 도색 흡수관을 갖는 원추형 집광시스템은 73.26%의 집열효율을 나타내었다. 따라서 본 연구를 통해 흡수관 표면의 흑색 도색이 원추형 집광시스템의 집열효율에 큰 영향을 미친다는 것을 알 수 있었다.

• Journal of Navigation and Port Research
• /
• v.32 no.5
• /
• pp.327-332
• /
• 2008

This paper analyzed the visual range and arrangement of light buoy on navigation officers as the primary material to establish the standard of optimal arrangement of light buoy on the channel of the domestic trade-port. About $30{\sim}150$ questionnaires by port were distributed according to the scale of trade-ports and then Effective total 356 copies were used in analysis. The distance, $2{\sim}4$mile, occupied the highest percentage 55.0% as the visual range with naked eyes at the daytime in bright weather. At the arrangement way of light buoy the both sides buoy method showed high in the preference 62.1% among the respondents. The preferred interval between sequence buoys was averagely 1.09mile. Also, the preferred number of light buoy was two in the preference 40.6% among them to cognize without binoculars.

• Atmosphere
• /
• v.18 no.2
• /
• pp.97-109
• /
• 2008

The aerosol characteristics in terms of 4 different cases (Asian dust, fog, clear sky and cloud) which had happened at Anmyeon Island in April 2006 were studied using various measurements such as the Micro Pulse Lidar (MPL), sunphotometer, $\beta$-ray $PM_{10}$ Analyzer, anemoscope and anemometer. In addition, synoptic charts, back trajectory analyses and satellite images were also used to help characterize the aerosol events. The aerosol optical properties were featured by the Aerosol Optical Depth (AOD) and ${\AA}ngstr\ddot{o}m$ exponent which were estimated by the sunphotometer. When Anmyeon Island was dominated by the Asian dust, the AOD was sharply increased as seven times as a yearly average of it (0.35). As compared with a yearly average of the ${\AA}ngstr\ddot{o}m$ exponent of 0.97, the ${\AA}ngstr\ddot{o}m$ exponent of a dust day was significantly low (0.099). In addition, $PM_{10}$ mass concentration showed an extremely high record. The maximum concentration reached $1790.5{\mu}gm^{-3}$ on 8 April 2006. The maximum mass concentration was shown with delay when the wind speed of $0ms^{-1}$ was observed. It was also found that a satellite image of the MODIS-RGB had a good agreement with the results of those measurements. It was shown that the MPL was able to describe effectively the vertical distribution of aerosol for all the cases. In particular, the MPL evidently captured the aerosol layer before the cloud observation. The aerosol layer was similarly described by the AOD. On a clear sky day, the AOD had not only a very low value (0.054) but also a feature of homogeneity.

• Solar Energy
• /
• v.13 no.1
• /
• pp.59-66
• /
• 1993

Since the direct(beam) normal solar radiation is a main factor for designing any focusing solar system, it is necessary to evaluate its characteristics all over the country. We have begun collecting direct normal solar radiation data since December 1990 at 16 different locations and considerable effort has been made for constructing a standard value from measured data at each station. KIER's new data will be extensively used by concentrating system users or designers as well as by research institutes. From the results, we can conclude that 1) $4,400kcal/m^2$. day of the direct(beam) normal solar radiation was evaluated for clear day. 2) Direct normal solar radiation of spring and summer were 6% and 14%, higher than the yearly average value, respectively, and for fall and winter their values were 5% and 15% than the yearly average value, respectively.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.16 no.2
• /
• pp.141-151
• /
• 2013

This study presents a modeling of aerosol extinction vertical profiles in Korea by using the Moderate Resolution Imaging Spectro-radiometer(MODIS) derived aerosol optical thickness(AOT) and ground based visibility observation data. The method uses a series of physical equations for the derivation of aerosol scale height and vertical profiles from MODIS AOT and surface visibility data. The modelled results under the standard atmospheric condition showed small differences with the standard aerosol vertical profile used in the radiative transfer model. Model derived aerosol scale heights for two cases of clean(${\tau}_{MODIS}=0.12{\pm}0.07$, visibility=$21.13{\pm}3.31km$) and hazy atmosphere(${\tau}_{MODIS}=1.71{\pm}0.85$, visibility=$13.33{\pm}5.66km$) are $0.63{\pm}0.33km$ and $1.71{\pm}0.84km$. Based on these results, aerosol extinction profiles can be estimated and the results are transformed into the KML code for visualization of dataset. This has implications for atmospheric environmental monitoring and environmental policies for the future.