• Journal of Plant Biotechnology
• /
• v.42 no.2
• /
• pp.129-134
• /
• 2015

In order to compare salt tolerance among potato cultivars (Solanum tuberosum L.), in vitro plants of each cultivar were cultured on the Murashige and Skoog's medium containing different levels of NaCl (0, 75, 150, and 225 mM). The suitable level of NaCl for a comparison of the shoot and root growth between potato cultivars was 75mM. Shoot length and weight were better in 'Dejima', 'Superior', 'Jayoung', and 'Haryeong' than in other cultivars such as 'Goun' and 'Atlantic'. Normal root growth was observed in 'Seohong', 'Superior', and 'Haryeong', while 'Goun', 'Atlantic', 'Dejima', 'Jowon', and 'Chuback' showed no root. Proline contents in all the cultivars increased as affected by NaCl levels, then the increase amount was fewer in the cultivars showed a better growth in both shoot and root than in others showed a poor growth. As a result of this study, 'Superior' and 'Haryeong' were determined as salt tolerant cultivars and therefore using these cultivars it would be possible to potato production at salt arable land such as reclaimed tidal.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.11
• /
• pp.19-26
• /
• 2019

To construct buildings on limited land, the size of the building is important. The development process needs to be minimized because determining the size of a structurally safe building at the planning stage incurs considerable time and cost. This study proposes the Limit Slenderness Ratio Approximation Equation. This study examined an outrigger structure system among several systems proposed for controlling the lateral displacement in tall buildings. This study compared the Limit Slenderness Ratio Approximation Equation with the approximate equation by changing the variables of the building model, and examined the size of the building using the approximate Equation. As an analysis program, the MAIDAS architectural structural analysis program was used to conduct model-specific analysis. The appropriate scale of the building to minimize the error between the approximate value calculated by the Limit Slenderness Ratio Approximation Equation and the analysis result of the structural analysis program is as follows. As the number of outrigger installation increases, the error can be reduced; the ratio of the cores is reasonable, from 20% to 30%, and the arrangement of the column is suitable only for the outer column without an internal column.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.8
• /
• pp.55-63
• /
• 2018

In this paper, we measured the propagation path loss by a ground to air flight communication test at UHF band and analyzed the results. The ground receiving terminal was located at 1,100m above sea level in Cheju Island and the airborne transmit terminal flew at an altitude of 3.5km from 150 to 220km from the ground terminal. In this case, the ground terminal and the airborne terminal are on the Line of Sight. Therefore loss in this communications environment can be predicted based on Free Space Loss. However, in this test, the sea level exists between two terminals, and due to the very small angle of incidence on the reflecting surface due to the long-range communication environment, it is not possible to accurately predict the loss of free space only. Therefore, considering that there are no surrounding obstacles and that a line of sight is secured between the end of two terminals, we applied a plane earth reflection model and a spherical earth reflection model to estimate the propagation path loss and compared with the actual test results. As a result of the comparison, the predicted propagation path loss by a spherical earth reflection model were quite similar to the actual test values.

• Journal of the Korean association of regional geographers
• /
• v.1 no.1
• /
• pp.93-101
• /
• 1995

Nam Khane watershed, in the Northern Laos, consists of limestone plateau surrounded with steep slope(above 1000m), wide piedmont hill land(300-700m) and narrow alluvial plain. Opium on the plateau and up-land rice on the hill-side are cultivated for each, but its shifting agricultural activity, which degrades the forest and soil, has caused the serious environmental problems. MOS-1 satellite image and 40 points of soil samples are analyzed to identify the distribution of the shifting cultivation and to evaluate the environmental problems for Nam Khane watershed. The land use classification map is presented on the photo 2, and the value of each land use area by elevation level and soil property are showed on the table 2 and 3, respectively. Excessive agricultural activity of shifting cultivation in the Nam Khane watershed not only decreased the forest area, but also changed the primary forest of tree into secondary woodland of shrub. On the phase of soil property, it accelerated the soil and gully erosion, and acidification. To solve these environmental problems, the most important step is to settle the agriculture from shifting cultivation to permanent cropping.

• Journal of Fisheries and Marine Sciences Education
• /
• v.9 no.2
• /
• pp.179-187
• /
• 1997

Doppler log and current meter are based on the measurment of the doppler effect. Ship's speed over the ground measured by means of doppler log effect of underwater ultrasonic intends to get infulence by the difference of sound velocity, the ship's course, the sea bottom inclination, the trim and tranducer installation etc. This paper investigated on the error of speed over the ground by change of the trim comparing the real speed obtained by the mile post with the speed of single beam type doppler log on the trainning ship Kyeongyangho. The results are as follows ; 1. Indicating speed of doppler log is very much greatly influenced on variation of trim, but the real speed is less affected variation by trim. 2. The range of variation and error of speed over ground are smallest when ship's trim is 2.15m trim by the stern.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.12
• /
• pp.650-658
• /
• 2017

A grounding system in a large-scale apartment complex consists of a TT grounding system when viewed in each building unit, but the characteristics of TN grounding system appears when viewed in the total ground system function. Therefore, this study examined the characteristics of a grounding system in a large-scale apartment complex using design draft, field measurements and PSCAD/EMTDC modeling. This paper proposes an algorithm for fault analysis depending on the grounding system structure in large-scale apartment complexes considering the connection of the underground culvert as well as a design algorithm for each grounding system considering the contact voltage and step voltage. The simulation results based on the proposed modeling and algorithm confirmed that it is useful for analyzing the characteristics of a grounding system in a large-scale apartment complex.

• Korean Journal of Environmental Agriculture
• /
• v.20 no.2
• /
• pp.116-121
• /
• 2001

To observe the stimulating effects of low dose ${\gamma}$ - radiation on the dormancy breaking and physiological activity, potato (Solanum tuberosum L. cv. Dejima) were irradiated at the dose of $0.5{\sim}30$ Gy. Low dose ${\gamma}$ - radiation exhibited promoting effects on the sprouting rate within the range of optimum dose of 1 Gy and 2 Gy and on the sprout length within the range of optimum dose of 2 Gy and 4 Gy. Regardless of storage duration and irradiation doses, the number of sprouts was enhanced. The number of sprouts, which were reserved for 15 days after production (DAP), were significantly increased under 4, 8 and 16 Gy irradiation. The growth of 45 DAP sprouts was extremely stimulated under 4 Gy irradiation accompanying the increase of peroxidase activity in the plantlet. In this study, it was also suggested that the activities of antioxidative enzymes of potato plantlets were not related to the irradiation dose during the plantlet development with the exception of decrease in catalase activity.

• Archives of design research
• /
• v.14 no.3
• /
• pp.87-96
• /
• 2001

If we look at Korea's urbanization since 1960, only the urban communities like buildings have developed, yet the resting places for human itself have been ignored. Many people continuously felt alienated especially after the mechanization and started to demand for better living space. For that reason, it is essential for us to develop the resting places for human among the buildings in urban areas and these resting places could form the basis of new community. We have researched on street furniture and citizen's behavior pattern in resting places through references and internet surfing to propose a design concept for a new resting place and street furniture, Therefore, we would like to design a resting place in urban area considering human, community and environment. As a result, we have designed a resting place where citizens could interact with surrounding environment and let office workers enjoy the nature among the buildings in this resting place. People could always stop by and take some rose by enjoying the surrounding nature. The resting place consists of 5 zones- public square, environmental zone, communication zone, technology zone, and entertainment zone. Each zone has its own design motif to lead systematic street furniture and site planning. The resting place is formed in a specific region which is a prototype of a resting environment in urban areas in the future and it could be reassigned according to its regional condition.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.16 no.2
• /
• pp.251-258
• /
• 1998

The purpose of this study is to develop the District-level Planning Support System (DPSS) by using GIS. The district-level planning which is related for district-level control of city, needs the various parcel-level information which is composing the urban physical environment. The information has to be stored and analyzed for recognizing the study area, then the district-level planning will be efficiently managed. The use of GIS in the process of district-level planning is restricted for the creation of thematic map. GIS is not used for the analysis of spatial patterns and planning process. This study evaluates the characteristics of current district-level planning and the basic components of urban physical environment. And the database model is built. The topology among components is defined by using the spatial relationship. Then the spatial query machine for district-level planing is developed by using ArcView 3.1, Avenue and Dialog Extension. This spatial query machine is applied for case study. This study shows 1) the possibility of the district-level planning support system for analyzing spatial relationship, 2) the needs of the up-to-date topographic map showing current building's footlines and the complete integration with cadastral maps, it will reduce the uncertainty in the spatial decision making process, 3) the methodology for the construction of spatial decision making rules, 4) the further study for the using of raster, network, image and three dimension data.

• Journal of the Korean association of regional geographers
• /
• v.7 no.1
• /
• pp.1-20
• /
• 2001

This study explored the changes of the patterns of land use and the social patterns of ownership of Kumnamno in Kwangju under the rule of Japanese colonialism by analyzing the townscape of Kumnamno in terms of the form and function of it. The research was done considering three periods: the year of 1912, 1930 and 1945. Kumnamno is the name of the street as well as the legal district name, and includes Kumnamno 1-ga, 2-ga, 3-ga, 4-ga and 5-ga. In the year 1912, Kumnamno was utilized as land, farmland and road. With the increase in population and the urbanization of the Kwangju area, it gradually began to be changed into land. By 1941, it was completely turned into land. Before and after the year 1910, the streets intersecting the Kumnamno area came into being as the roads of the Kwangju town, and were built with a lattice pattern. The road building of the Kumnamno began in accordance with the building of Kwangju station in 1922. The road building linking Kwangju Station to Chonnam Provincial Hall marked the first appearance of Kumnamno. The block from Ku-sung-no to Kumnamno 3-ga was built in 1925, the block from Kumnamno 3-ga to 2-ga in 1921, and Kumnamno 1-ga in 1930. It was not until the year 1933 that the construction of streets ranging from Ku-sung-no through Kumnamno 5-ga was finished. Examining the land ownership of the Kumnamno area in 1912, the Japanese possessed the land of Kumnamno 1-ga, 2-ga and 3-ga on the one hand and the Koreans possessed the land of 4-ga and 5-ga on the other hand. In 1930, the Japanese enlarged their sphere of influence and controlled the land located in all the areas of Kumnamno, and the Koreans reduced their ownership of Kumnamno 4-ga and 5-ga. There was a tendency for companies to occupy the land rapidly. In 1945, while the land owned by the Japanese decreased and the land owned by the Koreans did not change in quantity, the possessions of companies increased. To summarize, the Kumnamno area had some changes in the use of land during the above mentioned period. This was in part due to the construction of a street linking Kwangju Station to Chonnam Provincial Hall in order to strengthen the authority of the Japanese Government-General of Korea, as well as the expansion of the residential zone with the increase of the population of Kwangju.