• 수산해양기술연구
• /
• 제50권3호
• /
• pp.262-273
• /
• 2014

To investigate the catching efficiency of a biodegradable round trap for a swimming crab (Portunus trituberculatus), four types of material (two types of biodegradable net, one type of biodegradable plus polyethylene net and one type of polyethylene net) for traps were used in the field test, and the field tests were carried out 11 times in the Boryeong fishing ground of Korea, 2012~2013. The catching efficiency of four type traps was analyzed by catch per trap, weight per trap and mean weight per individual of small and large size swimming crab. Statistical Kruskal-Wallis test was carried out to verify the significant difference for the efficiency between types of material. The catch in number of swimming crab was 9,015 and formed about 94.3% of total catch. In the results of catching efficiency of traps, there was a little difference in catch per trap, weight per trap and mean weight per individual of swimming crab in-situ data. But there was no significant difference in catching efficiency between the biodegradable traps and the PE trap (P>0.05), so it's needed to use widely a biodegradable trap for the conservation and sustainable management of swimming crab resources.

• 수산해양기술연구
• /
• 제42권1호
• /
• pp.11-18
• /
• 2006

The behavior patterns of common octopus, Octopus minor to a cylindric trap were examined in the water tank using a video camera in order to know entering mechanism to the trap and to improve it. Fishing efficiency by 2 kinds of traps(A: 3 entrances, B: 2 entrances) was investigated in the coastal area of Deugryang Bay from May to July, 2005. Common octopus tends to approach by swimming more than walking towards trap. When they approached to the trap, they showed much more behaviors that sate at the around than upper part of it. Approaching behaviors of common octopus was more vigorous at nighttime than daytime on the trap, they showed the most vigorous action between 2 am and 4 am of the day. The rate of staying 30 seconds over around the trap was 41.5% in the nighttime. CPUE(g/trap) of common octopus caught by A type trap was 21.4% higher than the B type trap but there was no difference on the significance level of 5% by the ANOVA. Catch rate of common octopus and by-catch species caught by the A type trap were 97.2%, three and 98.7%, two for B type trap, respectively.

• 한국응용곤충학회지
• /
• 제49권2호
• /
• pp.145-149
• /
• 2010

참나무시들음병 매개충인 광릉긴나무좀 (Platypus koryoensis (Murayama)) (Coleoptera: Platypodidae) 모니터링에 활용 가능한 트랩 종류, 색, 설치위치가 포획수에 미치는 영향이 조사되었다. 조사는 경기도 파주시 광탄면에서 수행되었으며 끈끈이 평판 트랩과 다중깔때기 트랩 두 종류 트랩이 이용되었다. 조사된 두 트랩의 종류는 광릉긴나무좀 포획수에 영향을 미치지 않았다. 끈끈이 평판 트랩의 경우 노란색, 검정색, 흰색, 투명색으로 시험한 결과 트랩색이 광릉긴나무좀 포획효율에 영향을 미치지 않았다. 끈끈이 평판 트랩과 다중깔때기 트랩 모두 수간내 경사 위쪽과 아래쪽에 설치된 경우, 산의 경사 위쪽에 설치한 트랩에 유의하게 많은 수의 광릉긴나무좀이 포획되었다. 이는 두 가지 트랩이 모두 광릉긴나무좀 모니터링 및 방제에 효율적으로 활용될 수 있음을 보여주는 것이다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권8호
• /
• pp.430-435
• /
• 2006

This paper presents a method about the efficiency analysis and the harmonic reduction of single phase NPC multi-level inverter with LC-trap filter and LCR output filter. The proposed LC-trap filter is comprised of a conventional LC output filter, by using LC-trap filter the need for high damping resistor and low LC cut-off frequency is eliminated. Also, low damping resistor is increased the efficiency of the output filter. Experimental verification of the proposed circuit is provided with single phase NPC multilevel inverter system and DSP controller.

• 한국자원식물학회지
• /
• 제22권3호
• /
• pp.220-226
• /
• 2009

An experiment was conducted to find out among 9 trap settings the most appropriate site for trap placement in the Brinjal field based on Brinjal shoot and fruit borer trapping efficiency, shoot and fruit infestation, healthy and total fruit yield, and BCR. The efficiency of different trap setting positions varied significantly. Trapping efficiency observed the $T_{1}$ ensured the minimum shoot and fruit infestation 10.02% and 20.95%, respectively, minimum infested fruit yield (4.75 ton/ha), maximum healthy and total fruit yield (26.72 and 31.47 ton/ha) and the maximum BCR (1.70), which was followed by $T_{2}$ and $T_{4}$. The minimum trapping efficiency of $T_{9}$ treatment led the maximum shoot and fruit infestation 13.89 and 29.26%, respectively, maximum infested fruit yield (7.59 ton/ha), minimum healthy and total fruit yield (17.74 and 25.32 ton/ha) and the minimum BCR (1.00). A correlation between the number of BSFB adults trapped from the most efficient trap setting and the shoot and fruit infestation recorded and found a linear positive correlation between number of BSFB adults trapped and shoot infestation (r = 0.781) and fruit infestation (r = 0.810). The effect of pheromone trap positions observed in this study may be attributed to the easy accessibility of the lures and traps, when they are placed at the canopy.

• 한국식품영양학회지
• /
• 제12권2호
• /
• pp.191-191
• /
• 1999

A Purge & Trap Concentrator was used to analyze various volatile organic compounds(VOCs) in wat-er. The object of this study was to observe the purge efficiency of 40 VOCs in water according to the change of parameters (purge time drypurge time sample temperature) and to determine the optimum condition for VOCs using the purge & Trap concentrator interfaced with a narrow capillary connected to a gas chromatography/mass spectrometry. The optimum condition of purge and trap is as follows: purge time at 11min drypurge time at 5min sample temperature at 6$0^{\circ}C$ at constant purge flow (40mol/min) constant desorption flow(20ml/min) desorption temperature(2$25^{\circ}C$) and desorption time (1min) At this analytical condition the detection limits of VOCs was in the range of 0.1~0.5$\mu$g/ml and the purge efficiency of each compound was over 70%.

• Bulletin of the Korean Chemical Society
• /
• 제22권2호
• /
• pp.171-178
• /
• 2001

A Purge and Trap Concentrator has been used to analyze various volatile organic compounds in water, operating several parameters affecting the extraction efficiencies of these compounds. The object of the present study was to observe the purge efficiencies of 40 volatile organic compounds (VOCs) in water, according to the change of parameters (purge time, dry purge time, sample temperature), and to determine the optimum condition of analysis of VOCs. The Purge and Trap Concentrator was interfaced with a narrow capillary connected to a gas chromatography mass spectrometer. At this condition, the detection limits of VOCs were in the range of 0.1-0.5 ㎍/L.

• 유기물자원화
• /
• 제13권2호
• /
• pp.98-106
• /
• 2005

지렁이 사육상으로부터 지렁이를 분리, 수확할 수 있는 지렁이 유인장치를 개발하기 위해서 사육상에서의 지렁이 개체군 동태, 유인물질 및 유인틀내 철망의 mesh 크기, 덮개재질 등에 따른 지렁이 유인효율을 조사하였다. 지렁이 사육상에서 줄지렁이의 최고밀도는 약 $5kg/m^2$이었으며 최고밀도 도달한 이후에는 $4.4{\sim}5.0kg/m^2$의 밀도를 유지하였다. 유인틀내 철망의 mesh 크기는 7mm정도가 적정하였으며 유인틀 덮개는 표면은 매끄럽고 수분을 잘 머금을 수 있는 재질이 적당하였다. 유인틀내에 유인제를 사용하는 경우가 사용하지 않는 경우보다 유인효과가 현저히 높았으며, 유인틀내 유인제량이 많을수록, 유인틀 설치 기간이 길어질수록 지렁이 유인량이 많아졌다. 유인제로서는 분쇄된 배껍질이 제지슬러지보다 우수하였는데 이는 유인제내 당도의 차이에 기인하는 것으로 판단된다. 그러나 현장에서 사용할 수 있을 만큼 충분한 량의 배껍질을 공급하기가 어려우므로 그 대용으로서 설탕물(10%)을 유인물질로 이용하는 방안이 제시될 수 있었다.

• 한국자동차공학회논문집
• /
• 제21권6호
• /
• pp.64-71
• /
• 2013

In this study we designed a lean $NO_x$ trap (LNT) model with $GT-POWER^{TM}$ program and then the LNT model was compared to the bench flow reactor test results. This model consists of 9 kinetic reactions to represent the main steps of NO oxidation, $NO_x$ adsorption, $NO_x$ release and then its reduction. The comparison was performed on the operating conditions at the space velocity of 50,000 1/hr and 80,000 1/hr with the temperature range of $200^{\circ}C{\sim}500^{\circ}C$ with the even spaced temperature step of $50^{\circ}C$. The experimental results show that the $NO_x$ conversion efficiency was enhanced by the temperature up to $350^{\circ}C$ and then decayed at higher temperatures. The LNT model predicts the similar trend of the $NO_x$ conversion efficiency to the experimental results below $350^{\circ}C$, but overestimates above $350^{\circ}C$. This overestimation comes from the higher reduction efficiency which was obtained by the different reduction gas composition such as $C_3H_6$ in the model to replace $CH_4$, $C_2H_4$ in the bench test.

• 수산해양기술연구
• /
• 제43권3호
• /
• pp.176-182
• /
• 2007

Fishing power, which means performance of fishing vessel or catchability of fishing gear, can explain using by fishing power index(FPI) to compare fishery efficiency among uniformity types of fishery that work during the fixed period in specific fishing ground. This research analyzed on their fishing power and catchability using comparing each sampled vessels of coastal trap fishery for common octopus. The results showed that they were no difference in amount of used trap and immersed time etc. in CPUE among sampled vessels, and had no correlation of catch production due to vessel's tonnage. Most vessel's FPI estimates but 3 vessels were higher than the averaged, and showed similar fishing power in general. And then, CPUE and FPI showed that 4 to 5 tonnage vessels would be superior to another, 4 tonnage vessels had also good catchability. Therefore, we estimated that 4 tonnage vessels had the most efficiency work for coastal trap fishery for common octopus.