• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.08a
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• pp.55-58
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• 2003

IPMSM (Interior Permanent Magnet Synchronous Motor) is widely used in many applications such as an electric vehicle, compressor drives of air conditioner and machine tool spindle drives. In order to maximize the efficiency in such applications, this paper is proposed the optimal control method of the armature current. The controllable electrical loss which consists of the copper loss and the iron loss can be minimized by the optimal control of the armature current. The minimization of loss is possible to realize efficiency optimization control for the proposed IPMSM The proposed control algorithm is applied to IPMSM drive system, the operating characteristics controlled by efficiency optimization control are examined in detail by simulation.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05b
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• pp.16-19
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• 2003

YBCO film을 이용하여 2 stripe-meander 형태의 초전도 한류기를 제작하고 시험하였다. 초전도 film의 hot spot에 의해 발생하는 열을 분산시키기 위해 gold shunt layer를 입혔다. 사고각 $0^{\circ}$에서 사고발생 후 최초 quench 전류값은 $9.56A_{peak}$이었고 약 0.63 msec동안 fast quench 가 진행되고 이후에는 gold층의 열발생에 의한 저항증가가 약 3주기동안 진행된 후 안정되었다. 사고각 $45^{\circ}$와 $90^{\circ}$ 에서는 전류가 상승하는 도중 혹은 최고지점에서 사고가 발생했기 때문에 fast quench time이 각각 0.56 msec와 0.26msec를 보였다. 초전도 한류기를 적용하였을 때 사고전류는 사고직후 약 5배, 3주기후에는 약 8.5배까지 효과적으로 제한함을 알 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.529-532
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• 2002

We experimentally investigate the evolution of nanosecond Stokes pulses in a single-pass Raman laser pumped by a Q-switched Nd: YAG laser at 1064 nm. As a Raman medium, a GeO$_2$-doped graded-index multimode fiber of 220m long is used. We demonstrate that efficient generation of several Stokes components with 1.5-2.7 nanosecond pulsewidth is obtained by varying the input pump energy.

• Proceedings of the KIEE Conference
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• 2001.10a
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• pp.346-348
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• 2001

In this paper a wind power simulator is designed and implemented. This simulator realize the torque of wind blade by DC motor. And squirrel-cage induction machine is used as generator and controlled to achieve the maximum power point tracking(MPPT) algorithm.

• Proceedings of the KIPE Conference
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• 2002.11a
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• pp.59-61
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• 2002

This research investigates electron beam to specification energy to Module that was generalized and schematized difference of curved line after existing V-I efficiency characteristic curve and irradiation. And will analyze cause of Si crystal Solar cell's efficiency addition and subtraction by 80keV electron beam investigation.

• Proceedings of the KIPE Conference
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• 2002.11a
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• pp.209-212
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• 2002

In electrical machinery and apparatus, the most important problem is protect of machinery and apparatus in duo to transient phenomena and overload on operation. Particularly by advanced technology of late, there is demand for low cost of equipments and high percentage of use of equipments. Therefore, protection of machinery and apparatus in condition of overload is more valued considering that all efficiency increase is passed by operating all machinery and apparatus in condition of heavyload. In this paper, the suggested system is add overload protect system using CT in condition of overload.

• Korean Journal of Organic Agriculture
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• v.18 no.2
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• pp.113-134
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• 2010

The purpose of the study is to investigate factors influencing the adoption of environment-friendly agriculture in greenhouse vegetable production of Jeonnam province. An interview survey were conducted during 2008, including six counties: Gwansanku of Gwangju, Gwangyang, Goheung, Damyang, Boseong, and Suncheon. Major crops grown in surveyed area were green peppers, cucumbers, strawberries, cherry tomatoes, tomatoes, and watermelons. Logit model results show that adopters of environment-friendly agriculture are more likely to participate in extensional education programs, attend educational programs on environment-friendly agriculture, have greater cultivated acreage, and have larger agriculture-only-designated farmland. However the adopters are less likely to have greater number of family members participating in farming, and live Goheung county. Efforts should be made in extensional education programs to lead more vegetable growers to adopt environment-friendly agriculture. Policy makers' additional efforts should be followed to increase adoption rate of environment-friendly agriculture in lower adopted areas.

• Journal of the Korea Convergence Society
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• v.8 no.1
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• pp.131-138
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• 2017

The purpose of research and bamboo for failure, Damyang-county, Jeollanam-do at 2015 Damyang bamboo the world fairs held according to the attachment to local factors impact of regional development and hosting support. To identify the impact on the property held. Fair after setting up a hypothesis to carry out research in the visitors through after sample surveys and survey and Empirical Analysis. Show areas are improving in the future, due to host tourists want to come up with the purpose of research to become a popular tourist attraction again. Attachment or environmental factors and social factors showed that, and affect the region. The host of social factors turned out to be the biggest influence, and economic factors, environmental factors shown to affect, and to a venue in order.Attachment is a factor appears to be affecting the region was the venue. The property is shown to environmental factors is not statistically significant, and host local affection, support appears to be factors affecting the holding. As a result, Fair, held regional attachment to the Influence Factors of regional development support, and according to the next fair in the Region and through the impact on the property held.Evaluation strategy could contribute to explore the festival.

• Journal of Wetlands Research
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• v.18 no.4
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• pp.378-385
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• 2016

This study aims to suggest the framework of functional assessment on lotic area based on HGM(Hydrogeomorphic) approach targeting Wetland Protected Areas which are in the type of river channel, and to set up the fundamental data as a reference wetland. A total of 10 factors in terms of hydrology, biogeochemistry, plant habitat and animal habitat was analyzed based on the original approach of HGM and each Functional Capacity Index(FCI) of those factors was calculated. As the result of the modified FCI analysis, Damyang riverine wetland which is with artificial river bank had high values in the variables of area ratio of actual vegetation in the foreland, the number of plant per area and the area ratio of Salix spp., and those values were highly reflected on the factors of Nutrient Cycling(947,668.00), Species Richness and Maintain Characteristic Plant Communites(6.39) and Maintain Spatial Structure of Habitat(11.00). The Hanbando wetland which is keeping the natural bank had higher values in the variables of structural scale and species diversity, and the those values were highly reflected on the factors of Energy Dissipation(17,805.16), Subsurface Storage of Water(0.54), Removal of Imported Elements and Compounds(103,052.73), Maintain Characteristic Detrital Biomass(2.31), Maintenance of Interspersion and Connectivity (6.50), Species Diversity of Benthic macro-invertebrates(1.60) and Species Diversity of Vertebrate & Species Number of Other Animals(2.52/ 151.50), compared to the Damyang Riverine Wetland.

• Korean Journal of Organic Agriculture
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• v.26 no.3
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• pp.381-391
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• 2018

This study was carried out to determine whether cage traps can be used to capture wild boars successfully, and to assess their response to different bait materials and the number of wild boars caught. Steel cage-traps ($4.0m{\times}1.5m{\times}1.2m$, $L{\times}W{\times}H$) were installed at two sites in Damyang County and at one site in Sunchang County, South Korea. To identify preferred bait-diet, baits were prepared with dry corn and fermented sour corn and placed in equal amounts at the sites close to wild boar pads at 200 m intervals. Before selecting trap locations where sufficient activity was observed, pre-baiting was undertaken and steel-framed traps were installed with gates open. Preference for bait materials was not clearly defined. After providing the bait for the first time, the number of days until wild boars ate all the food were counted. In the Damyang and Youngam areas, where hunting was allowed, total bait consumption took 6 to 12 days; in contrast, in the Sunchang area, where no hunting took place, total food consumption took only 5 days. In addition, after pre-baiting with the mixture of dry and sour corn for diet for about 8.7 days and then opening the trap gates for 3 more days, 13.7 days were necessary to catch 4.3 wild boars per trap. These results suggest that hunting intensity around trapping places was an important factor in determining the success of the traps.