• Advances in Computational Design
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• 제2권1호
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• pp.1-13
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• 2017

This paper presents a variant of the Harmony Search Algorithm (HS) and its application to discrete optimization. The main proposed modifications regarding original HS are related to stopping criterion and reinitialization of population, called Harmony Memory. In order to investigate the efficiency of the algorithm, it was applied for obtaining optimal sections of reinforced concrete columns subjected to uniaxial flexural compression. To minimize the cost of the section, the amount and diameters of the reinforcement bars and the dimensions of the columns cross sections were considered as design variables. The obtained results were compared to those generated by other optimization methods. Since, to the examples, Harmony Search reached the same results achieved by Simulated Annealing, some additional analysis are presented in order to compare these methods regarding success rate and number of iterations to reach the optimum.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.429-429
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• 2009

Nanoporous anodic alumina membranes (NAAM) with high-density through-hole pores fabricated by hard anodization of aluminum in 0.3 M oxalic acid under the applied voltage of 40 (mild anodization), 80, 100, 120 and 140 V were investigated. The current-time responses monitored using a PC-controlled anodization cell and the corresponding pore structures attainable from field-enhanced scanning electron microscopy (FE-SEM) were analyzed in order to establish the optimum fabrication process. The nanoporous structure can be produced for all the voltage conditions, while the stabilized through-hole pore formation seems to occur at 40, 80 and 140 V. The growth rate under 140 V hard anodization was over 30 times higher than under 40 V mild anodization (1.5 um/hr).

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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• pp.435-438
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• 1998

In this paper, Electret is formed to range voltage -5[kV] to -8[kV] by corona charging in PTFE film and sensor is manufactured by method of moments in sensing infra sonic. Charges of charged film are calculated also TSC measurement and induced potential of sensing electrode according to the charges is become aware of computer simulation. Electret Infra Sonic Transducer, which is designed and manufactured according to the potential and electric field simulation in using method of moments, is proved as it is effectively. Because sensitivity that measured under 10[Hz] is that average value of sensitivity rising rate is 6.34 [dB/oct] as average value is $\pm$1 [dB/oct] range -5[kV] to -8[kV] in corona charging film. As a result, it is believed that characteristic of acquired transducer can be application of medical treatment, industry, and animal life researches and the study of noise elimination, what's more, is required.

• 한국산업융합학회 논문집
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• 제22권6호
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• pp.599-606
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• 2019

In this study, it was aimed to find the optimal cutting conditions by measuring and analyzing the dimensional accuracy of SNCM 616 alloy steel, which is commonly used in industry, by precision hole machining using Ø25 mm and 8-blade reamer in CNC-HBM to be. As a result of the roundness and dimensional accuracy, it was found that the spindle speed had a significant effect on the dimensional tolerance value. Optimum cutting conditions are spindle speed 25 rpm and feed rate 20 mm / min.

• 한국수산과학회지
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• 제15권3호
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• pp.179-184
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• 1982

Lartobacillus bulgricus를 glucose를 제한기질로 하는 합성배지에서 연속배양한 결과를 요약하면 다음과 같다. 1. 본 실험 model은 Monod의 chemostat 이론을 적용시킬 수 있다. 2. 본 실험 model에서의 최대 cell production rate는 $0.178 g/1{\cdot}hr$로서 회석율 $0.414hr^{-1}$ 일 때이다. 3. 연속배양 결과 saturation constant($K_s$)는 7.69g/l, 최대비증식속도$(V_{max})$는 $0.62hr^{-1}$ 이었다. 4. wash out 현상은 $0.51hr^{-1}$에서 일어났으며cell yield coefficient는 0.016g/l 이었다.

• KSBB Journal
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• 제18권5호
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• pp.418-423
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• 2003

발효조의 냉각수 공급 제어 신호와 냉각수의 유출입 지점의 온도를 온라인으로 측정하여 이 값들로부터 냉각량을 추정할 수 있는 실험식을 얻었다. 회분식 배양을 통하여 냉각량이 온라인으로 측정될 수 있음을 확인하였고 기질의 재투입시 냉각량의 변화를 통하여 유가배양의 제어변수로 활용할 수 있음을 점검하였다. 미리 프로그램된 목표 냉각량의 증가곡선에 따라 냉각량이 증가되면서 세포가 자라도록 유가배양을 실시하였다. 본 연구를 통하여 냉각량의 온라인 측정방법을 제시하였고 이를 유가배양 제어변수로 활용하여 세포의 성장속도를 조절할 수 있음을 보였다.

• 한국작물학회지
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• 제30권2호
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• pp.140-145
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• 1985

퇴비시용량 (0, 1,500kg/10a) 및 질소시비량 (0, 5, 10, 15, 20kg/10a)과 질소반양추비(1982년, 15, 20kg/10a의 경우)에 따른 단옥수수 Sun glow(1982년 공시) 및 Honey Bantam-9 (1983년 공시)의 생육 및 수량성은 다음과 같다. 1. 퇴비시용은 이삭의 크기를 증대시켰고 10a당이삭무게를 약 10％ 증가 시켰다. 2. 10a당 이삭수는 10a당 질소 10kg까지 증비할 때는 크게 증가하였고 이삭무게는 무퇴비구에서는 10a당 질소 20kg까지도 증수되었으나 퇴비시용구에서는 10a당 질소 10kg 까지만 큰 증수를 보였다. 3. 10a당 지상부 건물수량은 무퇴비구에서는 10a당 질소 15kg, 퇴비시용구에서는 질소 10kg까지 크게 증가 되었다. 4 지상부 질소흡수량은 무질소에서 8.1kg였고 10a당 질소 20kg 시용에서 18.8kg로 질소시비량 증가에 따라 직선적인 증가 경향이었다. 5 10a당 이삭수, 이삭무게, 건물중 등을 고려한 적정 질소시비량은 10a당 10-15kg로 보여진다. 6, 질소추비의 효과는 이삭크기, 10a당 이삭수 및 이삭무게 등에서 인정되지 않았다.

• 한국환경보건학회지
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• 제30권5호
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• pp.358-365
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• 2004

The photocatalytic oxidation of Rhodamine B(RhB) was studied using photocatalytic reactor filled with module of quartz tube. Module of quartz tube consisted of small quartz tube (inner diameter, 1.5 mm; outer diameter, 3 mm) bundle coated with powder $TiO_2$ and uncoated large quartz tube (inner diameter, 20 mm; outer diameter, 22 mm). Two 30 W germicidal lamp was used as the light source and the reactor volume was 0.5 l. The effects of parameters such as the coating materials and numbers, initial concentration, $H_{2}O_2$ dose and metal deposition (Ag, Pt and Fe) and simultaneous application of $H_{2}O_2$ and metal deposition. The results showed that the initial reaction constant of quartz module coated with powder $TiO_2$ was higher 1.4 time than that of the $TiO_2$ sol and optimum coating number is twice. In order to increase reaction rate, simultaneous application of photocatalytic and photo-fenton reaction using Fe coating and dose $H_{2}O_2$ dose increased reaction rate largely.

• 한국식품저장유통학회지
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• 제5권2호
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• pp.123-126
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• 1998

This study was carried out investigate to optimum levels of nitrogen and phosphate fertilizer to get a higher yield and a quality of an onion(Allium Cepa L.) from 1993 to 1994. Three fertilizer levels were applied with 120, 240 and 360kg/ha of nitrogen and 100, 200 and 300kg/ha of P2O5 during the onion growing season. After harvesting the onion, it was storaged at given deposit. The growth and yield of the onion were better at the fertilizer levels of both 240 and 360kg/ha of nitrogen and of both 200 and 300kg/ha of P2O5 than at the level of 120kg/ha in nitrogen and 100kg/ha of P2O5. The content of total nitrogen and P2O5 in plant was decreased with reduced application levels of nitrogen and phosphate fertilizer. The rotting rate was higher at the levels of both 360kg/ha in nitrogen and 300kg/ha in P2O5 than the other treatment during the storage period. The sprouting rate tended to be high at 240kg/ha of nitrogen and 100kg/ha of P2O5.

• 대한전자공학회논문지
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• 제15권6호
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• pp.66-78
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• 1978

Micropocessor를 기계계의 제어에 응용하기 위하여 drilling machine의 자동화를 위한 Software를 개발하였다. Work table의 좌표축 방향의 변위를 담당하는 Pulse motor가 지령 Pulse에 충실히 응답 할 수 있도록 하기 위하여 최적 start-stop pulse rata를 조사하여 이를 matrix화 함으로서 실제 작업시에는 입력 data에 의하려 최적 pulse rate로 시동 또는 정지의 정확을 기하도록 하였다. Workt able의 x-y평면내에서의 이동은 x축 motor와 y축 motor에 Pulse를 교대로 보냄으로서 변위 시간을 단축시켰다. Program을 Package화하여 작업사양에 따른 data만을 입력함으로서 사용의 편의를 도모하였다.