• 한국작물학회지
• /
• 제42권3호
• /
• pp.292-298
• /
• 1997

인삼포의 관행해가림 (볏짚피복, 투광율 3％)과 개량해가림(P.E. 차광망피복, 투광율 10％)의 해가림간 인삼 개체군의 군낙구조를 비교하기 위해서 년근별 (2, 4, 6년근), 재식위치별, 높이별로 엽면적, 비엽중(S.L.W,), 경엽의 건물중 및 조도의 분포를 조사한 결과는 다음과 같다. 1. 투광률(지상 40cm부위)은 2년근에서 관행해가림은 전행이 3％, 중간행이 2％, 후행이 1.5％였으며 평균 2.2％로 행간에 차이가 심했으나, 개량해가림에서는 전행이 12％, 중간행이 10％, 후행이 8％였으며 평균 10％로 투광률이 증가되어 행간의 차이가 근소하였다. 4, 6년근에서는 관행해가림의 광환경이 더욱 악화되었으나 개량해가림에서는 수광량이 행간의 차이가 근소하였다. 2. 2년근에서 재식위치별로 엽면적, 비엽중, 경 및 잎의 건물중 분포는 관행해가림과 개량해가림간에 차이가 근소하였다. 3. 4년근에서 재식위치별로 엽면적, 경, 엽의 건물중 분포가 관행해가림에서는 전행 및 중간행부분에 많이 분포되고 후행쪽은 적은 반면, 개량해가림에서는 행간에 차이가 적고 고루 분포되었으며 이러한 경향은 6년근시에 더욱 심하여 통로쪽의 지상부 건물중이 관행해가림은 개량해가림보다 현저히 증가하였다. 4. 근수량은 개량해가림이 관행해가림에 비해 28％증가되었으며, 재식위치별 근수량 지수는 관행해가림은 전행인 1∼2행이 높은 반면 개량해가림은 5행을 제외하고는 각행 고르게 분포되었다.

• 전자공학회논문지B
• /
• 제31B권11호
• /
• pp.136-141
• /
• 1994

본 논문에서는 영상에서 윤곽선을 검출하는 시스템을 확산신경회로망을 이용하여 광전자적으로 구현하였다. 확산신경회로망은 확산과정을 통하여 가우스연산과 DOG연산을 효과적으로 수행한다. 또한, 확산 신경회로망은 적은 연결과 고정된 연결세기로 인하여 전기적구현이나 광학적구현에 있어서 LOG마스킹방법을 이용하는 것보다 훨씬 효과적이다. 본 논문에서는 확산신경회로망을 빛의 맑기 분포함수가 가우스함수 모양을 갖는 특성을 이용하여 광전자적으로 구현하였다. 실험결과를 통해 본 시스템에서 윤곽선이 정확히 검출되는 것을 확인하였다.

• 환경영향평가
• /
• 제21권3호
• /
• pp.445-460
• /
• 2012

In order to evaluate and predict the environmental impact of the low-trophic-level ecosystem to environmental changes in the Yellow Sea and the East China Sea, an ecological modelling study was undertaken. Simulation results of average distribution patterns and concentrations of water quality factors during the summer by the model were acceptable. Phytoplankton and remineralization rate of organic matter were very important parameters by a sensitivity analysis. Water quality factors showed high values in the estuary of the Yangtze River and in the West and South Sea of Korea and low values in the central area of the Yellow Sea. There is a plume of high values, especially nutrients, off the mouth of the Yangtze that expands or contracts with changes in the discharge strength. Characteristics of responses of water quality factors vary for different scenarios of environmental change, such as land-based pollution sources and atmospheric forcing. It is suggested that changes of light intensity, discharges of input sources, and wind play an important role in the marine ecosystem.

• ALGAE
• /
• 제27권4호
• /
• pp.283-294
• /
• 2012

The physico-chemical and environmental factors of stoneworks were examined from March 2009 to October 2010, and aerial algae living on 24 stoneworks in Korea were identified. Fifty aerial algae were found in 24 stoneworks. Of the 50 taxa, 30 taxa were cyanophytes, 16 taxa were bacillariophytes, 3 taxa were chlorophytes, and 1 taxon was a xanthophyte. Nine species, including Aphanocapsa rivularis, which is known to only live in aquatic conditions, inhabited both aquatic and aerial environments. Synechococcus aeruginosus, Scytonema coactile var. thermalis, S. coactile var. minor, Stigonema ocellatum f. ocellatum, and Oscillatoria boryana were newly recorded in Korea. As a result of a correlation analysis between algae and the physico-chemical and ecological environmental factors, the taxa were divided into the bryophyte group, the humidity group, and the dry group. Although the bryophyte group was included within the humidity group, it was separated from the dry group. Taxa in the bryophyte group including Nostoc commune which was distributed in more humid areas than those in the humidity group. However, dry group taxa including Chroococcus pallidus were distributed in lower humidity than that of the two other groups. Correlations among other environmental factors were tested to identify other factors that could substitute for humidity and light intensity. As a result, tree distance, water distance, and plant coverage were replaceable environmental factors.

• Geomechanics and Engineering
• /
• 제22권1호
• /
• pp.49-63
• /
• 2020

Studying the critical response characteristics of box culverts with diverse geometrical configurations under seismic excitations is a necessary step to develop a reasonable design method. In this work, a numerical parametric study is conducted on various soil-culvert systems, aiming to highlight the critical difference in the seismic performances between three- and four-sided culverts. Two-dimensional numerical models consider a variety of burial depths, flexibility ratios and foundation widths, assuming a visco-elastic soil condition, which permits to compare with the analytical solutions and previous studies. The results show that flexible three-sided culverts at a shallow depth considerably amplify the spectral acceleration and Arias intensity. Larger racking deformation and rocking rotation are also predicted for the three-sided culverts, but the bottom slab influence decreases with increasing burial depth and foundation width. The bottom slab combined with the burial depth and structural stiffness also significantly influences the magnitude and distribution of the dynamic earth pressure. The findings of this work shed light on the critical role of the bottom slab in the seismic responses of box culverts and may have a certain reference value for the preliminary seismic design using R-F relation.

• Journal of Plant Biology
• /
• 제8권4호
• /
• pp.7-25
• /
• 1965

In order to clearify the microflora of the lower course of the Han River and the effect of the marine water on the Han River, the study was carried out at Paldang, Kwangjang, Noryangjin, and Haengju for 4 months (from May till September in 1965). The results obtained are as follows: 1) Water temperature, transparency, light intensity, pH, silicate, and salinity were determined as environmental conditions. 2) Samples collected from 4 stations were identified and classified by Engler's classification system. It resulted in 4 Phyla, 3 Classes, 13 Orders, 25 Families, 61 Genera, 155 Species, and 16 Varieties. The total numbers of phytoplanktons identified are 171. Of the number, 106 species and 12 varieties were recorded in this paper for the first time. 3) A comparative observation on the distribution of marine phytoplanktons and salinity in the Han River showed a fact that the Han River was biologically affected in the middle portion between Noryangjin and Haengju by marine water. Furthermore, the salinity determined at Haengjuduring a day(at high tide, September 26, 1995) supported the above fact. 4) Four species among the identified species are saprobic planktons and it is regarded as the forms derived from Chunggyechon.

• 한국환경과학회지
• /
• 제19권11호
• /
• pp.1323-1336
• /
• 2010

This study was carried out to determine marine environments and phytoplankton community around Mokpo harbour on March to November during the period of 2004-2009. The remarkable fluctuations of marine environments were shown around Mokpo harbour depending on monthly and yearly. Among seasons, summer was a great that was associated with extremely releasing the freshwater from Youngsan River Weir, contributing to effect the fluctuations of water quality. Nevertheless of monthly and yearly, the molecular ratio of N:P was always shown in above 16 that was mainly attributed to freshwater discharge on March to November. This indicates that phosphorus playes an important role in limiting factor as growth in phytoplankton. During this study, Skeletonema costatum was found to be richer than the other groups of diatoms in terms of abundance and species number. Mokpo harbour, with the presence of a narrow avenue for exchange with offshore waters, has limited growth in phytoplankton, but this species is able to well adapt and fast grow under even high level of suspended solid and low intensity of light compared with other species. The discharge of freshwater is associated with significantly fluctuation of marine environments in this region, but it does not affect the quantitative and qualitative distribution of phytoplankton. It is necessary to persistently monitor based on water quality and phytoplankton community.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2010년도 하계학술대회 논문집
• /
• pp.162-162
• /
• 2010

In this study, optical analysis for 100W LED safety street lighting was conducted. Experimental research on such single LED was the first undertaken. simulation modeling based on optical properties of single LED has compared single LED product also designed 100W simulation modeling has compared average road illuminance with Korean Industrial Standards for LED safety street lighting(KS C7658:2009). 100W safety street lighting (model: CE180-ST-OS) designed by simulation has been also compared between product and 100W simulation modeling, and error rates have showed average 5.6[%]. Designed 100W LED safety street lighting base on simulation modeling was proven by comparison experiments. Through the simulations and the corresponding analysis, it was found that the tested 100W LED safety street lamp had reasonable performance. Design method for LED safety Street lamps have been summarized, based on the optical analysis.

• International journal of advanced smart convergence
• /
• 제5권2호
• /
• pp.73-79
• /
• 2016

Remote sensing and measurement are of paramount importance of providing information on the state of water quality in water bodies. The formation and growth of cyanobacteria is of serious concern to in land aquatic life forms and human life. The main cause of water quality deterioration stems from anthropogenic induced eutrophication. The goal of this research to quantify and determine the spatial distribution of cyanobacteria concentration in the water using remote sensing technique. The standard approach to measure water quality based on the direct measurement of the fluorescence of the chlorophyll a in the living algal cells and the same approach used to detect the phycobilin pigments found in blue-green algae (a.k.a. cyanobacteria), phycocyanin and phycoerythrin. This paper propose the emerging sensor design to measure the water quality based on the optical analysis by fluorescence of the phycocyanin pigment. In this research, we developed an method to sense and quantify to derive phycocyanin intensity index for estimating cyanobacteria concentrations. The development of the index was based on the reflectance difference between visible light band 620nm and 665nm. As a result of research this paper presents, an optical biological sensor design information to measure the Phycocyanin parameters in water content.

• 한국자동차공학회논문집
• /
• 제8권5호
• /
• pp.105-113
• /
• 2000

In order to clarify the final process of oil consumption, the distribution and flow of oil through each ring were visualized by induced fluorescence method. Motoring and firing test were performed in a single cylinder research engine with transparent cylinder liner. The appropriate calibration techniques were used to solve the unstability of induced light intensity as well as to know the relation of the oil film thickness and output signal. Oil behavior was also observed at dynamic state by high speed CCD camera. By analyzing the oil film thickness converted from the photographed image, it was observed that the main route of oil transport through each ring is the end gap under the usual operating condition, low engine speed and low load condition. Oil film thickness is observed to be irregular and tend to move in a body horizontally at a given piston land. And it is also found that oil flows through oil ring gap so quickly that it can be observed in a single cycle, but it flows so slowly through top and 2nd compression rings that it takes quite a long time to detect the flow.