• 기계저널
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• 제23권3호
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• pp.200-206
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• 1983

FAM의 기본적인 구상은 해석 하고자하는 선형 또는 비선형 편미분 방정식을 국부적으로 해석 적인 해를 구하여 이용하자는 것이다. 그러기 위하여 유한차분법(FDM)과 유한변분법(FEM)에 서와 같이 전체유동장을 작은 요소로 나누고 그 요소 내에서 국부해를 구한 다음 이들 요소를 중첩시킴으로써 각 요소의 미지수에 대한 대수식을 얻어서 수치해를 구하자는 것이다. 그러나 FDM에서와 같이 국부요소에서 미분항을 구하지 않고, FEM 에서와 같이 요소에서 형상함수를 도입하지 않는 상태에서 해석적인 해를 구하고 있기 때문에 수치해석에서 얻어지는 미분양들은 비교적 정확하게 구해진다. 따라서 Navier-Stokes 방정식이나 에너지 방정식에서 최고차항이 작은 파라메타, 즉 레이놀즈수나 피크리수의 역수로 곱하여서 있는 경우에도 안정된 해를 구할 수 있다고 알려져 있다. 요소자체의 계수를 구하는 데는 계산시간이 많이 소요되지만 수치해석 상의 안정성이나 수렴성이 좋기 때문에 전체계산시간은 오히려 적게 걸리는 경우도 있다고 한다.

• Journal of the Optical Society of Korea
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• 제17권1호
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• pp.81-85
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• 2013

A miniaturized fluorescence detection system based on total internal reflection (TIR) configuration, which is applicable to detecting the presence of biological materials labeled with fluorescence dye in micro total analysis systems (${\mu}TAS$), is proposed. In conventional fluorescence testing and analysis devices, interference between the excitation light beam and the emitted light from dyes is unavoidable. This paper presents a fluorescence detection system based on TIR configuration that allows the excitation light beam and the emitted light to be spatially perpendicular to each other so as to minimize the interference where fluorescence emission is detected at the orthogonal angle to the excitation beam. We achieved the limit of detection of about 5 nmol/L with a high linearity of 0.994 over a wide range of 6-FAM mol concentration, being comparable to that in earlier studies.

• 한국식품과학회지
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• 제14권1호
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• pp.49-56
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• 1982

Swift변법에 의하여 분리대두단백질과 카제인의 유화용량을 측정할 때와 Acton변법에 의하여 유화안정도를 측정할 때의 여러 가지 실험조건이 측정결과에 미치는 영향을 관찰하였다. 유화용량(EC)은 단백질의 농도$(0.1{\sim}0.3%)$와 교반속도$(6,000{\sim}12,000rpm)$가 증가할수록 감소하였다. 기름첨가속도 $0.8{\sim}1.0\;ml/sec$ 범위에서는 EC에 큰 변화를 일으키지 않았으며 이온농도$(0.1{\sim}1M)$가 증가함에 따라 EC는 증가하는 경향을 나타내었다. 단백질의 등전점 부근에서 EC는 가장 낮게 나타났으며 이에 따른 EC의 변화는 단백질의 NSI 변화와 거의 같은 경향을 나타내었다. 유화안정도(EC)는 단백질의 농도, 기름첨가량, 교반속도, 교반시간이 증가할수록 높아졌으며 pH의 변화에 따른 ES의 변화는 단백질의 NSI변화와 같은 경향을 나타내었다. NaCl$(0.1{\sim}1.0M)$ 첨가시 Na-case-inate의 ES는 높아졌으나 분리대두단백질의 ES는 감소하였다. 이상의 실험 결과로부터 식품단백질의 유화작용을 평가하기 위한 기준측정법을 선정하고 이 방법에 의하여 실험실에서 제조된 분리대두단백질의 유화작용을 평가비교하였다.

• 생물환경조절학회지
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• 제20권4호
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• pp.357-364
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• 2011

능유바위솔을 분화로 재배하고자 할 때, 적정 광도 와 내음성정도, 적정 분용토, 그리고 적정 시비조건을 알아보기 위해 실험을 수행하였다. 그 결과 능유바위솔은 52% 차광에서 생육이 가장 양호하였으며, 82% 차광까지는 생육이 감소하기는 하지만 상품성은 유지되어 내음성이 뛰어난 것으로 판단되었다. 90% 이상의 차광에서는 고사주가 발생하였으며, 엽색도 탈색되고 잎이 위로 서는 등 관상가치가 크게 저하되었다. 분용토로는 마사토 : 유비상토 : 강모래(6 : 2 : 2, v/v/v) 에서 생육이 가장 좋았다. 특히 지상부 생체중의 경우 다른 용토에서는 약 4~8g 범위였으나, 마사토 : 유비상토 :강모래(6 : 2 : 2, v/v/v)에서는 16g으로 2배 이상의 생육량을 보였다. 시비조건은 Hyponex 액비를 1,000~2,000배액으로 1회/주 처리했을 때, 생체중 및 초폭, 분지수 등에서 가장 좋게 나타났다. 특히 생체중의 경우 대조구(무처리)가 16g인데 비해 1,000배액 1회/주와 2,000배액 1회/주 처리에서 약 29g으로 80% 정도 생장량이 증가하였다. 엽색에서는 액비의 농도가 높을 수록 엽색이 짙어지는 경향이 보였다.

• 수산해양교육연구
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• 제7권1호
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• pp.111-126
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• 1995

In general, the electromagnetic transient phenomenon always exists in induction motor(IM) with the torque change. The control performance of IM is very worse than that of D.C motor owing to this transient phenomenon. So many studies about the elimination methods of the transient phenomenon have been making progress. Interesting methods of them are the Field acceleration method(FAM) and the method of impulse addition on the input voltage at the time point of torque change. In this paper, first, the circuit equation of IM is derived from the phase segregation method. The torque equation consisted of the stator and rotor currents is derived from the solving of the circuit equation. As we well known, the transient terms exist in this the torque equation. The method of impulse addition on the input voltage at the instance of torque change is confirmed theoretically for the elimination of the transient phenomenon. With the base on it, the author proposed a real time algorithm to eliminate the transient terms. The control system is consisted of the PI controller with the feedforward of torque change. The author could confirm that the quick stepwise responses of torque and speed can be obtained from response simulations.

• Journal of Acupuncture Research
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• 제19권4호
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• pp.101-111
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• 2002

Objective : In order to review the studies related to the treatment of children by aupuncture or mo ibustion Methods : We referred to a Pubmed site by using searching word of "the terms of pediatrics(for e ample child children infant baby pediatrics etc and acupuncture" Results : 40 journals with 63 papers were searched 50 papers were reported Conclusion : 1 We found 63 articles in 40 journals which were Pediatrics J Tradit chin Med Am Fam Physician Anaesthesia linical research was the most of these studies and the pattern of the rest were review or clinical conferences 3 We analy ed articles and found many articles of nocturnal enuresis asthma bronchitis postoperative vomitting constipation etc 4 The result of clinical studies represented the significant cure rate owever the cases of sensorineural hearing loss vomitting after tonsillectomy e ercise induced asthma were not 5 It was ta en to research for laser acupressure bloodletting ear acupuncture etc as well as body acupuncture in the area of pediatric acupuncture treatment as alternative therapy which was composed of the lower stimulation than adult.

• 신재생에너지
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• 제6권1호
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• pp.20-28
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• 2010

Developing the offshore wind farm is essential to meet the national target of the renewable energy and to achieve the green growth in Korea. In this context, KEPRI is now carrying the feasibility study for introducing the offshore wind fam in Korea. Accordingly, it is required to formulate an appropriate strategy, this paper mainly discuss, for this goal. First of all, several preliminary sites for the offshore wind farm are selected based on the evaluation criteria presented herein. In addition, the domestic sub-technological level of key technology sectors associated with the offshore wind power is analyzed. It includes the industries related to wind turbine, grid integration, structural design and construction. Integrating these results, we propose a strategy in order to successfully develop the first offshore wind farm more than 100-MW class in the south-western sea area of Korea.

• 정보처리학회논문지B
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• 제11B권4호
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• pp.449-456
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• 2004

본 논문에서는 모호성을 포함하고 있는 시계열 패턴인식을 위한 새로운 인식모델인 순환퍼지기억장치를 제안한다. 순환퍼지기억장치는 기존의 퍼지기억장치에 순차적인 입력패턴를 처리하고 시간적 관련성을 표현할 수 있는 순환층을 추가함으로써 확장된 모델이다. 본 논문에서 제안하는 순환퍼지기억장치는 입력과 출력사이의 관련정도를 설정하기 위해 헤비안 방식의 학습알고리즘을 사용한다. 그리고 순환퍼지기억장치의 순환층에 필요한 가중치를 학습하기 위해서 오류역전파 알고리즘을 이용한다. 본 논문에서는 제안하는 모델을 음성신호의 경계를 추출하는 문제에 적용하여 성능을 평가한다.

• Advances in Traditional Medicine
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• 제6권4호
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• pp.330-335
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• 2006

The present investigation was carried out to determine the efficacy and safety of Abutilon indicum (A. indicum) (Eng: Country Mallow, Fam: Malvaceae) in patients of bronchial asthma. Dried aerial parts of A. indicum were finely powdered and given in the dose of 1 gm tid to 30 patients of either sex in the range of 15 - 80 years with mild to moderate bronchial asthma with or without any concurrent medication. The respiratory functions (FVC, $FEV_{1}$, $FEF_{25-75%}$and MVV) were assessed using a spirometer prior to and after 4 weeks of treatment. Efficacy of the drug in improving clinical symptoms and severity of asthmatic attacks was evaluated by interviewing the patient and by physical and hematological examination at the end of the treatment. 4 weeks treatment with the drug showed statistically significant improvement in various parameters of pulmonary functions in asthmatic subjects. Also significant improvement was observed in clinical symptoms and severity of asthmatic attacks. None of the patient showed any adverse effect with A. indicum. The results of the present study suggest the usefulness of A. indicum in patients with mild to moderate bronchial asthma.

• Steel and Composite Structures
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• 제7권1호
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• pp.19-34
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• 2007

This paper presents results of a non-linear finite element analysis of axially loaded slender hollow structural section (HSS) columns, strengthened using high modulus carbon-fiber reinforced polymer (CFRP) longitudinal sheets. The model was developed and verified against both experimental and other analytical models. Both geometric and material nonlinearities, which are attributed to the column's initial imperfection and plasticity of steel, respectively, are accounted for. Residual stresses have also been modeled. The axial strength in the experimental study was found to be highly dependent on the column's imperfection. Consequently, no specific correlation was established experimentally between strength gain and amount of CFRP. The model predicted the ultimate loads and failure modes quite reasonably and was used to isolate the effects of CFRP strengthening from the columns' imperfections. It was then used in a parametric study to examine columns of different slenderness ratios, imperfections, number of CFRP layers, and level of residual stresses. The study demonstrated the effectiveness of high modulus CFRP in increasing stiffness and strength of slender columns. While the columns' imperfections affect their actual strengths before and after strengthening,the percentage gain in strength is highly dependent on slenderness ratio and CFRP reinforcement ratio, rather than the value of imperfection.