• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.64-64
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• 2017

본 연구에서는 낙동강에 위치한 강정고령보에 설치된 자연형 어도의 유인효율 증대를 위한 어도의 위치 수정 제시를 하였다. 평면 2차원 물리서식처 모형인 River2D 모형을 통해 강정고령보의 자연형어도 입구부의 유속장과 WUA(Weighted Usable Area)를 이용하여 유인효율을 분석 실시하였다. 유인효율 분석 결과 자료와 2013년도 어류모니터링 자료를 통해 WUA는 어류 유인효율 평가하는 지수로 사용 될 수 있는 것을 간접적으로 검증하였다. 어류의 소상에는 유속이 중요한 인자로 작용한다. 모의를 통한 강정고령보의 유속장을 확인해보면 자연형어도가 설치된 좌안과는 반대로 우안쪽으로 형성되는 것을 확인하였다. 어도의 모양 및 위치를 수정한 지형자료를 이용하여 River2D 모형모의를 통한 어도의 유인효율을 증대 시킬 수 있는 방법을 제시하였다. 유속장이 주로 발생하는 보 우안쪽에 설치하는 것이 유인효율을 최대로 끌어낼 수 있었지만 비용적인 부분과 유인효율을 같이 생각한다면 현재 설치된 좌안 자연형어도의 입구부를 상류쪽으로 위치하여 재설치하는 것이 어류의 유인효율을 증대시켜주는 효과적인 제시방안이 되리라 사료 된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.162-162
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• 2016

본 연구에서는 한국 낙동강에 위치한 강정-고령보에 설치된 by-pass 어도의 유인효율을 유량 변화에 따라 살펴보고, 어도 유인효율을 극대화할 수 있는 최적의 본류 방류량을 산정하였다. 강정-고령보는 고정보와 가동보로 구성된 혼합식 보로 유량조절이 가능하며, 가동보의 조작에 따라 by-pass 어도 내의 유량이 결정된다. 유인효율의 지표로 목표어종의 HSC(Habitat Suitability Criteria) 지수에 기반한 WUA(Weighted Usable Area)를 삼았다. WUA는 평면 2차원 물리서식처 모형인 River2D를 활용하여 계산하였다. 또한 River2D로 계산된 유속장은 GPS Floater를 활용한 현장관측 자료로 검증하였으며, 어망을 이용한 월별 어류 모니터링 자료로 유인효율 평가의 타당성을 간접적으로 검증하였다. 결과적으로 본 연구 대상인 강정-고령보의 by-pass 어도에서 가장 효과적으로 목표 어류를 유인하기 위해서는 본류의 유량이 190 cms내외를 유지해야 한다. 특히 목표 어류인 모래무지가 봄철(4월~6월)에 산란기를 맞아 상하류로 이동하려는 경향을 띄므로, 이때 적절한 가동보 운영을 통해 본류 유량을 190 cms로 유지하는 것이 필요하리라 사료된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.176-176
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• 2015

최근 대하천사업을 통하여 낙동강에 총 8개의 다기능보가 설치되었으며, 이러한 하천 내 수공 구조물은 하천에 서식하는 어류의 이동과 군집의 변화, 유전적 단절, 서식처 변화와 같은 다양한 문제점을 유발할 수 있으며, 특히 어류의 산란기에는 하천의 유로를 따라 상류로 이동하거나 하류로 이동하는 회유성 어류들에게는 심각한 문제를 야기한다. 이러한 다기능보의 상 하류의 단절로 인한 문제를 해결하기 위해 낙동강 8개의 다기능보에 자연형 및 인공형 어도가 설치되었으며, 이를 평가하기 위한 어도의 유인효율에 대한 연구가 중요하다. 어류는 최대 유속이 발생하는 지점인 유심선에서 소상하려는 특성을 보이는데, 어도의 입구부의 유속이 중요하게 작용한다. 어도 입구부의 유속분포 및 수심에 따라 유인효율은 다르게 나타날 수 있으며, 2차원 수리해석을 통해 WUA를 산정함으로써 어도의 유인효율을 평가할 수 있다. 본 연구에서는 2차원 흐름해석 모형인 River2D를 이용하여 어류의 소상이 중요한 산란기를 기준으로 강정고령보의 가동보 운영실적을 이용하여 수리해석을 실시하였으며, 연구결과를 바탕으로 자연형어도의 유인효율을 평가하였다.

• Journal of Korea Water Resources Association
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• v.52 no.spc2
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• pp.855-863
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• 2019

The efficiency of fishway installed in rivers can be directly evaluated by means of fish monitoring. On the other hand, when it is difficult to monitor the fish in certain conditions, or when planning a fishway, the efficiency can be evaluated indirectly through the hydraulic analysis. In this study, the hydraulic analysis technique for evaluating the efficiency of a fishway was presented. The River-2D model with the fish physical habitat module was used for the analysis of the attraction efficiency, and the weighted usable area was proposed as an index of the efficiency. In the analysis of passage efficiency, the three-dimensional model, Flow-3D, was used as an evaluation tool to describe the fluid behavior on a hydraulic structure with free surface. The ice-harbor type fishway at Baekgok weir in the Deokcheon River was selected as a test-site, and the efficiency was estimated using the hydraulic analysis. And then it was compared with fish monitoring data acquired from the river. As a result, it is difficult to replace the hydraulic analysis results with the efficiency quantitatively, but it can help to grasp the general tendency.

• Journal of the Korea Organic Resources Recycling Association
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• v.13 no.2
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• pp.98-106
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• 2005

Population dynamics in the vermicomposting bed was investigated. And harvesting efficiencies of earthworm attracting traps with different attractants, mesh sizes of net and covering materials was evaluated. Peak density of earthworm population was $5kg/m^2$ and therafter its desity kept $4.4{\sim}5.0kg/m^2$. It was evaluated that suitable mesh size of the net was 7mm and proper covering materials of the earthworm attracting trap was cotton quilt. The earthworm harvesting efficiency of trap with attractant was much higher than that of trap without attractant. With more amount of attractant in the trap and with longer setting period of trap onto the vermicomposting bed, the earthworm attracting trap harvested more earthworms. Crushed pear-peel attracted much more earthworms than paper mill sludge, but it was difficult to supply enough amount of crushed pear-peel for practical need. Sugar solution(10%) with tab water was proven to be an alternative to crushed pear-peel because its attracting effect on earthworm was as high as crushed pear-peel and it was easy to prepare and supply in large quantity.

• Korean journal of applied entomology
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• v.54 no.4
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• pp.443-448
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• 2015

The attractant effect to Platypus koryoensis (Murayama), an insect vector of Korean oak wilt disease, was determined using a multi-funnel trap and trap logs treated with ethanol and ethanol extract of the bark of the Mongolian oak Quercus mongolica (Fisher). The number of entrance holes in ethanol and bark ethanol extract treatments was higher than that in the control (blank bottle). However, the number of entrance holes in ethanol and bark ethanol extract treatments was not significantly different. The number of entrance holes in the logs increased with increase in diameter of the logs. The lower part of the trap logs had significantly more number of entrance holes than that in the upper part (p < 0.05). The lower part of trap logs tends to be rarely exposed to direct sunlight resulting in desiccation of the logs, which in turn provides good conditions for microbial growth, a food source for P. koryoensis. The results show, that ethanol could be used effectively in the monitoring and maintenance of P. koryoensis because of the cheaper cost of ethanol than bark ethanol extracts, and thus, having a higher economical advantage. Further research of oak bark ethanol extracts is necessary to improve its efficiency.

• The Korean Journal of Pesticide Science
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• v.12 no.2
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• pp.162-167
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• 2008

To enhance the control efficacy against cockroaches in dwelling space, repellent ("Push") was set down on one comer and a poison bait including attractant ("Pull") was on the opposite side. And we tested the control efficacy of Push-Pull strategy by behavior-stimuli of cockroaches. In a mini-field test, German cockroach males primarily chose shelters nearest to the attractant-treated surfaces and farthest from the repellent-treated surfaces. The consumption of food or bait was also highest from food nearest to the preferred shelters by push-pull effect. We evaluated the push-pull insecticidal efficacies of five essential oils belong to Citrus plant, namely, grapefruit, lemon, lime, orange, and petitgrain. The combined push-pull treatments appeared to be faster and higher insecticidal effects than single (pull) treatment, and the repellent efficacy of Citrus oils was in the order of grapefruit > lemon > lime > orange > petitgrain. Therefore, we propose the effective control of the german cockroach using Citrus oils as repellents and push-pull method into a limited area.

• The Korean Journal of Soil Zoology
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• v.7 no.1_2
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• pp.1-5
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• 2002

The pumpkin fruit fly [Bactrocera (paradacus) depressa Shiraki] was first trapped on June 1st with ground and Mcphail traps in Jinan and Iksan drea, Chonbuk Province and was found to have single generation during the grow-ing season in 2002. Not much difference existed in the number of B. (paradacus) depressa flies attracted to various colors but Bactrocera (zugodacus) scurellatus Hendal came to yellow and green more than to blue color. In a study of the effect of diets on the degree of attraction by the flies, it turned out that B. (paradacus) depressa came more to yeast hydrolysate (YH) and in June i.e, the early period of adult emergence of the year. However, more individuals of B. (zugodacus) scutellatus are attracted to the extract of young pumpkin fruits. More B. (paradacus) depressa was caught with McPhail traps while more B. (zugodacus) scurellatus was caught with sticky traps and accordingly, species specific traps are recommended when yearly population trends of fruit flies are studied.

• Korean journal of applied entomology
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• v.62 no.4
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• pp.245-253
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• 2023

A control technique using mass-trapping was developed against thrips infesting hot peppers cultivating in greenhouses. It was essential to develop effective lure(s) attracting thrips for the control technique. Especially, mass-trapping using aggregation pheromone (AP) of the thrips was not much effective in open field cultivating hot peppers. This study aimed to develop a new lure to enhance the attractiveness of AP-based mass-trapping. In addition, this study was designed to investigate the decrease of attractiveness of the AP-based mass-trapping in the open field conditions. Methyl isonicotinate (MIN) as a new lure was assessed by the laboratory olfactometry and showed its attractiveness to thrips and its mixture effect with AP to attract the thrips. These results led us to test the AP+MIN mixture in the open field conditions cultivating hot peppers. The mixture significantly enhanced the mass-trapping efficacy in the open field conditions. Especially, the significant increase of the captured numbers was found in the western flower thrips, Frankliniella occidentalis. Furthermore, the increase of the AP concentration in the mass-trapping significantly increased the captured numbers in F. occidentalis and other thrips occurring in the hot pepper field. This study demonstrated the difference in the AP-based mass-trapping efficacy of the thrips between greenhouse and open field conditions. It also showed the increase of mass-trapping efficacy by increasing AP concentration in the trap. Especially, this study proposes a high efficient mass-trapping technology by the addition of MIN to AP especially against F. occidentalis.

• Journal of Aquaculture
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• v.13 no.2
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• pp.175-179
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• 2000

Trochopore larvae of U. unicinctus were exposed to selected settlement stimuli. Within 5 - 10 min after addition of the UM, the settlement stimuli derived from the skin of adult echiuran, induced metamorphosis of trochopores to pelagosphera. However, the trochopores did not positively respond for settlement, when stimulated with normal sea water, sticky fluid drawn from Tegillarca granosa or blood of U. unicinctus. The thermo-sensitive UM was relatively stable at ambient temperature, but was destroyed at 70$^{\circ}$.