• 농약과학회지
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• 제13권4호
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• pp.203-208
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• 2009

살균제 dithianon과 chlorothalonil 수화제 현탁액에 기존의 전착제와 콩기름을 주성분으로 하는 시험용 내우성 증진제를 각각 혼합하여 고추잎에 점적처리하고 인공강우를 이용하여 고추잎 표면에서 내우성을 측정함으로써 새로운 내우성 증진용 식물유 제제의 개발 가능성을 조사하였다. 카바액제 등 시판되고 있는 3종의 전착제는 dithianon 수화제의 내우성을 저하시켰으며, 전착제 농도가 증가할수록 그 저하효과는 더욱 현저하였다. 반면에 chlorothalonil 수화제에 대해서는 레이트론 만이 내우성을 약 3 배 증진하였으며, 다른 2 종의 전착제는 오히려 내우성을 저해하였다. 콩기름의 유화성 만을 고려하여 조제한 유화제를 함유하는 콩기름 유제는 dithianon 수화제의 내우성에 영향을 미치지 못하였으나, 식물 잎에 침투성인 비이온성 계면활성제로 polyoxyethylene monotridecyl ether 혹은 polyoxyethylene monolauryl ether를 콩기름용 유화제의 한 성분으로 첨가한 시험용 제제는 1.5배 이상의 내우성 증진 효과를 나타내어 새로운 제제의 개발 가능성을 확인할 수 있었다.

• Journal of Mechanical Science and Technology
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• 제18권8호
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• pp.1306-1311
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• 2004

We suggest a new type of swing motion control system for a crane system in which a small auxiliary mass is installed on the spreader. The actuator reacting against the auxiliary mass applies inertial control forces to the spreader of the container crane to reduce the swing motion in the desired manner. In this paper, as the basic and first step, we apply the $H_{\infty}$ control approach to anti-sway control system design problem. And, it will be shown that the proposed control strategy is useful and it can be easily applicable to the real world. So, in this study, we investigate usefulness of the proposed anti-sway system and evaluate system performance through simulation and experimental studies.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.660-665
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• 2007

This Study is a structure analysis about twin lift telescopic Spreader that usually loading and unloading a container in harbor. Applied load is assumed by lifting 65tons that is the maximum weight of real container. The finite element analysis for 3D model is performed by ABAQUS/Standard. We made an estimate of safety by evaluating the results of the finite element analysis.

• Journal of Mechanical Science and Technology
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• 제18권4호
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• pp.681-688
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• 2004

For use of the thermal cycle of the biochemical fluid sample, the isothermal temperature source with a large surface area was designed, fabricated and its thermal characterization was experimentally evaluated. The comprehensive overview of the technology trend on the temperature control devices was detailed. The large surface area isothermal temperature source was realized by using the vapor chamber heat spreader. The cost-effectiveness and simple manufacturing process were achieved by using the metal-etched wick structure. The temperature distribution was quantitatively investigated by using IR temperature imaging system at equivalent temperatures to the PCR thermal cycle. The standard deviation was measured to be within 0.7$^{\circ}C$ for each temperature cycle. This concludes that the presented isothermal temperature source enables no temperature gradient inside bio-sample fluid. Furthermore it can be applied to the cooling of the electronic devices due to its slimness and low thermal spreading resistance.

• 한국정밀공학회지
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• 제20권6호
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• pp.230-237
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• 2003

On this study, we operated the dynamic response for impact load of impact absorbing system for spreader by the finite element analysis and showed respectively the spring constant and the damping coefficient which the reaction force by impact was the lowest value for three types impact absorbing system according to the change of system, also we presented the change of impact reaction force according to the spring constant and the damping coefficient. Additionally, among the three types impact absorbing system according to the change of system, the reaction force of model II was the lowest value and the next model which has higher value than model II was model Iand model III has the highest value in the three types.

• 동력기계공학회지
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• 제7권3호
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• pp.54-60
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• 2003

In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In this paper, we suggest a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container to reduce the swing motion in the desired manner. In this paper, we apply the $H_{\infty}$ based control technique to the anti-sway control system design problem. And the experimental result shows that the proposed control system is shown to be useful and robust to disturbances like winds and initial sway motion.

• 한국축산시설환경학회지
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• 제6권1호
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• pp.37-44
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• 2000

A new hose slurry spreader with improved spreading uniformity is developed to distribute the slurrynear to the soil surface and to reduce odor problems. The precision of distributed slurry was investigated using 3 types of slurry and found to be dependent on the rotor speed. For the solid matter separated fluid containing 0.1% of dry matter rotor speed of 150 rpm showed best uniformity with CV of 10% In the case of slurry from dairy cattle which contains 8.2% of dry matter high rotor speed of 330 rpm showed best result with CV of 7.2% Also swine slurry which has a 13.6% of dry matter content showed the best result of 8.1% CV at the high rotor speed of 250rpm. A high rotor speed generates enough pressure in the central distributor and as a result uniform distribution of slurry can be achieved. In conclusion it is highly recommended rotor speed of 300 rpm to get the best performance.

• Transactions on Electrical and Electronic Materials
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• 제13권6호
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• pp.292-296
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• 2012

An optimum heat sink for a 30 W chip on board (COB) LED down-light is designed, fabricated, and characterized. By using the SolidWorks Flow simulator and thermal analysis software, the thermal characteristics of the optimum heat sink is analyzed. Four different types of heat sink are simulated and an optimum structure of the heat sink is found. The simulated temperature of the heat sink when operating the LED down-light is $55.9^{\circ}C$, which is only a difference of $2^{\circ}C$ from the measured temperature. In order to reduce the temperature further, a copper spreader is introduced to the heat sink. The temperature of the heat sink with the copper spreader is $3^{\circ}C$ lower than without the copper spreader.

• 동력기계공학회지
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• 제8권1호
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• pp.55-61
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• 2004

In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In this paper, we suggest a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. In this paper, we apply the $H_{\infty}$ based control technique to the anti-sway control system design problem. And the experimental result shows that the proposed control system is useful and robust to disturbances like winds and initial sway motion.

• 한국환경농학회지
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• 제31권2호
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• pp.152-156
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• 2012

표면의 형태가 다른 복숭아 3품종을 선정하여 살충제flubendiamide의 잔류양상을 조사하고 또한 전착제 사용에 따른 잔류량을 조사하였다. 복숭아 표면의 형태는 현미경으로 관찰한 결과 창방, 월미 품종의 순으로 털이 많았으며, 천홍품종은 털이 없는 것으로 나타났다. Flubendiamide의 잔류량은 털이 많은 창방에서 가장 높게 나타나 0.54 mg/kg이었으며, 월미에서 0.43 mg/kg, 그리고 천홍에서 0.10 mg/kg이었다. flubendiamide와 전착제 polyoxy ethylene methylpoly siloxane를 함께 처리를 하였을 때, 각 품종별 복숭아에 대한 농약 잔류량은 창방에서는 전착제의 사용유무에 관계없이 0.55 mg/kg로 거의 변화가 없었으며, 월미에서는 0.53 mg/kg으로 0.10 mg/kg 증가하였다. 천홍에서는 0.48 mg/kg 으로 나타나 전착제의 사용으로 잔류량이 4.8배 증가되었다. 이러한 결과는 전착제의 사용이 표면에 털이 있는 품종에서는 농약의 잔류량을 증가시키지 않았으나, 표면에 털이 없는 품종에서는 잔류량을 증가시키는 것을 보여주었다.