• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.11a
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• pp.290-293
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• 1997

In this paper, volume resistivity is studied so that the electrical properties for transformer oil due to the stirring temperature of BTA is investigated. A measurement of volume resistivity using the VMG-1000 highmegohm meter is recorded after 10 minutes when the each voltage, and DC 100[V], 250[V], 500[V] and 1000[V] is applied, according to the step voltage appliaction method. A coaxial cylindrical liquid electrode to measure volume resistivity of specimen is used, and its geometric capacitance is 16[pF].

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.736-738
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• 1993

The problems of he plentiful harmonics and low power factor have occured to the increase of semiconductor power conversion equipments. These problems should be improved by the active power filters which have been studied recently. This paper described the appliaction of delta modulation technique to current-fed filter and control performance. Through digital simulation the output characteristics of delta modulator are investigated theoretically.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.570-572
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• 2015

NFC (Near Field Communication) is an area of the RFID technology is a kind of short-range wireless communication. NFC technology is to utilize the data transfer, the access control system is usefully employed in many fields, such as mobile payment. Recently smartphone application development using NFC is activated, recognition of the convenience of the current NFC tag is insignificant state. In this paper, it is the content of the Application that was created in order to provide the knowledge of convenience food to the customer to visit the mart. Users with Mart, using smartphones, at a NFC tag that is attached to the food display stand food information, purchasing tips, keeping method, data such efficacy is provided over the screen of the smartphone. If you purchased the food is placed in the refrigerator "moves to the food list of application to click the button, through the food list screen their food list in the refrigerator, and by providing information such as expiration date, the user There is help me to be able to buy the more convenient food.

• Journal of Digital Convergence
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• v.19 no.3
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• pp.313-318
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• 2021

In order to treat a disease, it is necessary to take the medication on time, but many people often violate or forget the time they take the medicine. Applications are emerging to solve these problems using information technology. However, for existing applications, it is difficult to use because it provides only a notification functions, user interface is inconvenient, and photo registration of the medication is impossible. To solve these problems, the study developed a smart medicine management application that allows users to set up their taking routines, check if they are taking them, search hospitals and pharmacies, and attach images of medicines they are taking. Through this appliaction, it is possible to reduce the frequency of forgetting the time taken and to take accurate medication by checking the actual image. It also supports the setting of a taking routine to support multiple medications with different taking cycles. It can also provide information about hospital and pharmacies close to their current location to increase access to hospital and pharmacies.

• Journal of The Korean Society of Grassland and Forage Science
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• v.19 no.2
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• pp.141-146
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• 1999

This experiment was conducted to investigate the effects of application seasons and the level of cattle slurry on nitrate contents in soils of rye cultivation under climatic conditions of Korea. The main plots were appliaction seasons(100% application in spring, 100% application in autumn, 50% application in spring and autumnn after dividing cattle slurry into two equal parts) and subplots were the levels of cattle slurry-N application(0, 50, 100 and $200kgN\;ha^{-1}\;year^{-1}$). Cattle slurry was spred evenly over the soil surface in spring (end of March) and autumn(early of November). The experiment was done at Gongiam, Kwangju, Kyung-gi for 3 years, from 1994 to 1996. The results obtained are summarized as follows; 1. Nitrate content in soils was not influenced by application seasons of cattle slurry. 2. Nitrate content in soils increased as the level of cattle slurry application increased, and the average nitrate content became 3.6mg per liter. 3. Nitrate content in the soil depth from 0 to 20cm increased as the level of cattle slurry application increased, and the average nitrate content became 28.9mg per liter. However, nitrate content in the soil depth from 40 to 60cm was the lowest(7.5-8.3mg per liter).

• Korean Journal of Soil Science and Fertilizer
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• v.28 no.2
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• pp.176-182
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• 1995

Field and pot experiments were carried to find out the effects of direct application of phosphate rock powder on soybean plant in upland soils with different available P content. In newly reclaimed upland soil with extremely low available P, phosphate rock powder was superior to single superphosphate at the application rate of 400kg-600kg/ha, in the first year particularly. In the second year, however, the reverse was the case excepting at the rate of 200kg/ha. In upland soil with low avialble $P_2O_5$($52mg\;kg^{-1}$), the application of phosphate rock powder at the high appliaction rate(400-600kg/ha) increased the yield of soybean remarkably in the first year and there was residual effect in the second year. The application of phosphate rock at high rate, increased the P and Ca contenl of plant and soil. The concentration of all fractions of P in the soil at the harvest was higher in phosphate rock treatments than in single superphosphate and fused magnesium phosphate treatments. In this soil with low avaiable P the occurrence of different fractions of P was in the order of Org-P>Fe-P>Ca-P>Al-P, in the first year and there was no change in the second year.