• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.553-556
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• 2003

End-milling have been used in the industrial world because it is very effective to the manufacture of mechanical parts with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study carried to decide the optimum cutting condition for surface roughness and rapid manufacturing time using design of experiment and ANOVA. From the results of experimentation, surface roughness have an effect on cutting direction, spindle speed and depth of cut. And then the optimum condition used Taguchi design is upward cutting in cutting direction, 600rpm in spindle speed, 240mm/min feed rate, 2mm in axial depth of cut and 0.25mm radial depth of cut. By using design of experiment, it is effectively represented shape characteristics of working surface in end-milling.

• 한국환경과학회지
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• 제12권3호
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• pp.359-366
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• 2003

Ecological society and energy conservative systems has become a subject of world wide attention. To examine the technologies of such systems as resource recycling society, this study is proposed for using rainwater as energy source and water resources in urban area. Useful informations for planning of utilizing rainfall as energy source, water resources, emergency water and controlling flood are discussed with model systems in urban area. It is calculated that the rate of utilizing rainwater, amounts of utilizing rainwater, substitution rate of supply water, amounts of overflow rainwater according to rain storage tank volume. By applying the past weather data, The optimum volume of rain water storage was calculated as 200m$^3$ which mean no benefits according to the increase of storage tank volumes. For optimum planing and control method at the model system, several running method of rainwater storage tank was calculated. The optimum operating method was the using weather data as 3hours weather forecast.

• Journal of Welding and Joining
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• 제15권6호
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• pp.85-95
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• 1997

This study is to investigate the optimum conditions of Nd:YAG laser beam welding for Zircaloy-4 end cap closure by optical fiber transmission. Laser welding parameters which affect the penetration depth and bead width were experimentally examined using the various beam radius by the beam quality analyzer, joint geometries of end cap and the laser parameters which mean pulse width, repetition rate and pulse energy. Also, an optimum welding speed and the effect of assistant gas with varying the flow rate of He were investigated. We found that the laser average power for the end cap welding will be 230W and rotation speed must not exceed 8 RPM, the best position of focus using optical fiber with 600.mu.m will be 2 to 3mm below the surface of the material.

• Environmental Engineering Research
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• 제17권2호
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• pp.117-122
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• 2012

A central composite design and response surface methodology were applied to investigate the optimum conditions for maximum adsorption capacity in activated alumina as an adsorbent. The optimized conditions were determined for adsorption capacity using variables of flow rate and temperature. It was found that flow rate and temperature greatly influenced the adsorption capacity, as determined by analysis of variance analysis of these variables. Statistical checks indicated that second order polynomial equations were adequate for representing the experimental values. The optimum conditions for adsorption capacity were $0^{\circ}C$ and 2,718 mL/min, with the estimated maximum adsorption capacity of 17.82%. The experimental adsorption capacity was 17.75% under these optimum conditions, which was in agreement with the predicted value of 17.82%.

• 대한조선학회지
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• 제25권1호
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• pp.3-10
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• 1988

This paper presents some experimental investigations on the effectiveness of the Stern-End-Bulb(SEB) and the design procedure of the optimum one. Experimental method was discussed to search the optimum SEB and the resistance reduction rate was investigated from the resistance test results of the SEB series for a passenger boat and a container ship. The contribution of SEB on the propulsive coefficients was discussed from the self-propulsion test results for a container ship. It would be expected that the power saving rate is about 5.8 percents for a passenger boat and 3.6 percents for a container ship by optimum SEB, respectively.

• 한국작물학회지
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• 제66권4호
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• pp.289-296
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• 2021

쌀가루 가공용벼 품종인 한가루, 설갱, 신길 및 바로미2의 수발아 발생 위험을 감소하기 위한 지역별 적합 이앙기 및 이에 따른 등숙기 생육온도, 수발아 발생 위험성을 변화를 분석한 결과는 다음과 같다. 1. 쌀가루 품종의 출수기변화요인을 분석한 결과, 이앙부터 출수까지 일 평균온도 및 이앙시기변화는 포장생육일수와 부의 상관관계를 보이며 이앙시기변화에 따른 포장생육일수 변화는 유의한 상관관계를 보였다. 2. 이를 바탕으로 수발아 발생위험성 감소를 위해 등숙기 온도를 최저로 낮추기 위해 각 지역별로 안전출수한계기에 출수할 수 있는 이앙시기를 분석한 결과 대략 5월 초순(강원지역)~6월 중순(남부 내륙지역) 혹은 6월 하순(남부 해안지역)이 이앙적기로 판단되었다. 3. 각 품종별로 이앙적기에 이앙 시 수발아 발생 위험이 있는 등숙적산온도 700℃ 및 900℃의 평균온도를 분석한 결과 700℃의 경우 대체로 약 20℃, 900℃의 경우 18℃의 온도를 나타내었다. 4. 쌀가루 가공용 품종의 수발아 발생가능성을 분석한 결과, 바로미2을 제외하고는 등숙적산온도 700℃ 및 900℃에 등숙기 온도가 20℃ 미만 시 수발아 발생율은 높지 않은 것으로 판단되었다. 5. 바로미2의 경우 다른 품종에 비해 등숙기간중 수발아 발생위험성이 높아 낮은온도에서 수발아 발생위험성을 재검정하여 이앙시기를 재설정할 필요성이 있다.

• Journal of Biosystems Engineering
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• 제18권4호
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• pp.390-401
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• 1993

This study was conducted to analyze the optimum capacity of Rice Processing Complex (RPC) and to select the optimum location of RPC based on the analysis of rice production and its commercializing rate for each county of major area of paddy field nationally. The study results showed that 500 of RPC having a drying capacity of 3,000 tons of rice would be needed nationally based on the selection analysis.

• 한국안전학회지
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• 제3권1호
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• pp.37-45
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• 1988

This research investigated the condition for plant design on reclamation of waste plastic by heat decomposition. The results were summarized as follows 1. The highest of oil product by heat decomposition is about 54.7％. 2. The optimum reaction temperature is about 300­40$0^{\circ}C$. 3. The optimum reaction time is 2­3 hours. 4. When the flow rate of 8­16 cm/sec in column reactor the yield is maximum. 5. Waste plastics yielded of carbon black product by heat decomposition at the optimum condition is about 23.5%. 6. Calorific values 0：1 were 9820 Kcal/kg.

• 한국수산과학회지
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• 제12권2호
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• pp.79-86
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• 1979

빛이 어류의 행동에 미치는 영향을 조사하기 위하여 잉어, Cyprinus carpio에 광척극을 가한 실험을 낮과 밤에 각각 실시한 결과를 요약하면 다음과 같다. 1. 잉어의 분포율은 본 실험에 사용한 제한된 수조내에서 U자형과 거의 같은 구간분포경향을 보였다. 2. 빛의 세기가 어떤 적정치보다 더 강하거나 약할 때 어류가 광원으로부터 멀리 떨어진 곳에 모였기 때문에 잉어의 적정수중조도가 발견되었다. 3. 수중조도에 대한 집어율곡선의 최대치로부터 잉어의 집어율이 낮과 밤에 차이가 있었다. 4. 잉어의 집어율이 최대인 평균수중조도는 낮에 $3.813lux(2.99\~4.761\;lux)$였고, 밤에는 $6.292lux(5.0\~7.89\;lux)$였다. 5. 잉어의 집어율은 반사집어율과 평형집어율의 두가지 형태로 나타났다. 6. 반사집어율은 광원을 점등한 직후에 나타났으며, 시간에 따라 변화를 보였고, 평형집어율은 거의 균일하였다.

• 대한기계학회논문집A
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• 제20권8호
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• pp.2508-2515
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• 1996

Determination of an optimal feed rate is valuable in the sense of the precision and efficient machining. In this regard, a new surface roughness model for the face milling operation that considered the radial and axal runouts of the inserts in the cutter body was developed. The validity of the model was proved through the cutting experiments, and the model is able to predict the real machined surface roughness exactly with the information of the insert runouts and the cutting conditions. From the estimated surface roughness value, the maximum feed rate that obtains a maximum naterial removal rate under the given surface roughness constraint can be selected by using a bisection method. Therefore, this mehod for optimizing the feed rate can be well applied to the using a bisection method. Therefore, this method for optimizing the feed rate can be well applied to the using selsction of the cutting condition during the NC data generation in CAM.