• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.8
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• pp.15-21
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• 2020

We improved the sound pressure of the speaker and allowed the speaker to rotate 360 degrees to improve the effectiveness of the acoustic type bird repellent system. The prototype of the bird repellent system was developed by evaluating sound pressure characteristics by distance and direction and installing orchards. As a result of the evaluation, the extermination sound pressure increased from a distance of about 30 m to a maximum of 60 m, and through the rotary speaker, the extermination distance could be widened in all directions without specific direction.

• Journal of Korean Society of Rural Planning
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• v.26 no.1
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• pp.89-99
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• 2020

This study was conducted as a basic research to create a sound and vital ecological environment in the city compared to the appearance characteristics of Gap stream(G-stream), which are the main stream of Banseok stream(B-stream), by analyzing the characteristics of waterbirds, including Wild Spot-billed Duck (S-Duck), that live in B-stream built as ecological stream. The waterbird survey was conducted by the line census for 3.2km, Jukdong-bridge to Jamiseon-bridge, from January to August 2018. The analysis of the survey was conducted with Relative species density(RD) of the emerging waterbird species, the Species diversity and Density Per Unit area for 100㎡(DPU). The waterbird survey results of B-stream was conducted 65 times. The five types of water birds that appeared during the survey were Spot-billed Duck(Anas poecilorhyncha), Teal(Anas crecca), Little Egret(Egretta garzetta), Great Egret(Egretta alba), and Grey Heron(Ardea cinerea). As a result, for S-Duck at B-stream, RD was 89.9%, monthly species diversity was simple as 0.3801 in January, 0.5943 in February and 0.3501 in August. The DPU of the S-Duck was 0.165/100㎡ in the B-Stream survey section which was 4.9 times higher than the main stream section, G-stream. The non-freezing zone of the city's small stream is expected to play an important role as a winter stop for wild birds such as S-Duck during the freezing period of the huge stream. For this reason, considering the ecological characteristics of wild waterbirds such as S-Duck when creating ecological stream, a: space and linear selection of waterways which can minimize the impact of natural enemy and increasing the number of walkers, b: management water-friendly plants in the low flow channel, c: arrangement walking-bicycle road will be necessary.

• Asian Journal of Turfgrass Science
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• v.18 no.4
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• pp.193-200
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• 2004

Environmentally sound control of fall webworm, Hyphanria cunea (Drury) with entomopathogenic nematode, Sreinernema carpocapsae Pocheon strain was evaluated in the laboratory and pot. Pathogenicity of 5. carpocapsae Pocheon strain was different depending on larval stage, i.e., mortality of the 2nd instar and the $3\~4th$ instar was $100\%$ with >20 infective juveniles (Ijs)/larva in 3 days, but the 5th instar was $34\%$ with (Ijs)/larva in 3 days. Pathogenicity of 5. carpocapsae Pocheon strain was higher with increasing nematode concentration. Mortality of Hyphanria cunea larva by 5. carpocapsae Pocheon strain was not significantly different (more than $70\%$) between nematode concentration on treated trees (Malus alba and Platanus orientalis) and in pot.