• 전기학회논문지
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• 제63권4호
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• pp.461-468
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• 2014

An efficiency test for generators is generally required in case of construction of a new power plant or replacement of an existing generator. Generally, the efficiency of generator is measured by the input-output ratio under any given condition. Therefore, the best way is to directly measure the value of input and output power of a generator and calculate the efficiency values. However, it is difficult to measure a generator's input values accurately, especially for large systems. So, we are usually measuring the losses of the generator. But for measuring these values, there are several constraints for test such as preparing additional power generator and releasing the protection relay for manual operation of auxiliary equipments. Therefore, this study suggests that a novel generator efficient test method using the shaft-torque method which can be carried out while the generator is normally operating. The reliability of the result value was verified by comparing with the efficiency test results of the conventional retardation method on IEEE Std 115-1995.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.86-87
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• 2015

An active study on UHPC, which has been recently used in high-rise building and bridges, is in progress. However, research on bonding shear strength of UHPC is required to be studied due to the lack of information. In this study, experimental research progress for bonding shear strength (shear strength of adhesive surface) evaluation of UHPC (Ultra High Performance Concrete) is proceeded. First, specimens that surface treatment methods of concrete bonded section and retardation time of placement are considered are produced. Second, Direct Shear test is applied on concrete bonded section of UHPC. As a result of this study, the highest bonding shear strength specimen in which compared to the non-retardation time specimen is compaction turbulence treatment. From later study, it is judged that strength of UHPC in accordance with direction of steel fiber when steel fiber of UHPC is mixed.

• 대한감각통합치료학회지
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• 제14권1호
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• pp.19-30
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• 2016

목적 : 본 연구는 상호작용식 메트로놈(Interactive Metronome: IM) 훈련이 지적장애 아동의 집중력과 단기기억력에 미치는 영향에 대해 알아보고자 하였다. 연구방법 : 지적장애로 진단 받은 아동 2명을 대상으로, 개별실험 연구방법(single-subject experimental research design)중 ABA 설계 사용하였다. 총 18회기로 매주 2회기씩 총 9주 진행하였다. 기초선 기간에는 IM 훈련을 하지 않은 상태에서 Electroencephalogram(EEG)를 부착하여 단축형 검사(short form test)로 뇌파를 측정하였으며, 대상자가 무작위(random)로 선택한 단기기억 과제로 측정을 실시하였다. 중재기 12회기는 IM 훈련을 40~50분간 실시한 후 단기기억 과제(shot-term memory test)를 측정 하였으며, 단축형 검사를 측정하였다. 재기초선 3회기에도 기초선 기간과 동일하게 진행하였다. 결과 : 상호작용식 메트로놈 훈련 후 집중력의 향상과 뇌파에서 변화를 보였으며, 단기기억 과제에서도 향상된 결과를 보였다. 결론 : 상호작용식 메트로놈 훈련은 지적장애 아동에게 집중력과 단기기억력의 향상을 위한 중재방법으로 기대되며, 본 연구는 이를 위한 근거 자료로 사용될 수 있을 것이다.

• 한국항공우주학회지
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• 제31권3호
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• pp.15-22
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• 2003

피로균열성장모델을 유도하고 지연모델을 제안하였다. 피로균열성장모델은 피로균열선단의 소성변형으로 인하여 균열표면에 발생하는 잔류소성스트레치를 고려하고 있다. 균열 성장률은 균열선단 재료요소의 소성변형에너지와 누적피로손상으로부터 계산된다. 유도한 균열성장모델로부터 계산한 균열성장률은 AL6061-T651과 17-4PH 주강의 시험결과와 잘 일치하고 있다. 피로균열성장지연모델은 인장과대하중으로부터 생성된 잔류소성스트레치를 근거로 하고 있으며, 인장과대하중은 다음 하중 사이클의 소성변형률을 감소시킨다. Strip-yield모델을 이용하여 균열선단의 소성역을 계산하였다. 새로 제안된 지연모델은 인장과대하중하의 피로균열선장특성 및 지체지연 현상을 잘 기술하고 있다.

• Journal of the Korean Wood Science and Technology
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• 제10권3호
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• pp.152-164
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• 1982

1. In order to make the improvement of plywood quality, this study has been made. The pretreatments applied to the veneers are as follows. a) The soaking treatment of the veneer in 30 percent methanol solution for 24 hours was applied to remove some resinous materials which may cause many stain discolouring on the face of finished plywood. b) The preservative treatment of the veneer in 2 percent malenit solution for 2 to 3 minutes was adopted to make resistance against decay and insect damages. c) The fire retardant treatment of the veneer in 40 percent ammonium phosphate solution for 2 hours was applied to give retardation effect against fire burning. 2. The results summarized in this study are as follows. a) One percent resinous materials was extracted, after the soaking of the veneers in 30 percent diluted methanol. b) No marks of the dirty stains of resinous materials on the face of the treated plywood was shown, although many quite dirty stains on the face of untreated plywood have contrary seen. c) However, the strip shear test strength of the treated plywood was not decreased. It means that there is no difference in the strength between the treated plywood and the untreated plywood. The strength values were 25.08 kg/$cm^2$ and 24.98 kg/$cm^2$, respectively. d) The strip shear test strength of plywood made of the treated veneers in 2 percent malenit solution was not decreased. e) The slight decrease of the strip shear test strength of the treated plywood made of the treated veneer in 40 percent ammonuim phosphate solution was shown. However, the remarkable difference of the fire retardation activities between the treated specimens and the untreated specimens has seen as in Table 10, that is, the fire proofed specimens had taken about 28 seconds to start to burn, while the untreated specimens had taken 15 seconds to reach to burning. This means that the fire retardation effect of the fire proofed plywood was greater than that of the unproofed plywood.

• 보건의료산업학회지
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• 제7권2호
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• pp.101-111
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• 2013

To develop the Korean-Version-Improvement program for ordinary people, we investigate how Korean-High-Intelligent people use their cognitive function, intellectual capacity and Intelligent Quotient test. Using Mensa iq test, we classify intelligent examination tool into various components; visual, geometrical component and cognitive interpretation component. Also we organized each component, got database of intelligent subjects sample, classified itemized availability. Based on these things, we prove efficiency of intelligent examination tool. We found out that high intelligent people showed high Intelligent Index using visual cognitive stimulation with cognitive function when subjects were exposed to certain situation; solving the problem. This intelligent examination tool is low price and safe and easily carrying out with personal computer. If we develop intelligence quotient examination customized with mental retardation populations, a variety of subjects will improve their cognition with efficiency and inexpensively.

• 사상체질의학회지
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• 제20권3호
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• pp.151-163
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• 2008

1. Objective This study was done to identify the anti-stress effect of Hyeongbangdojeok-san (HDS), Yanggyeoksanhwa-tang(YST) in Soyangin. 2. Methods Experimental animals were composed of YST, HDS+stress groups which were administered each by 200mg/kg, 400mg/kg and the Saline+stress group. On the 1st day, making the rats forced swim and on the 2nd day, applying Forced swimming test to the rats. After FST, the levels of Corticosterone in the blood were measured. For the study of learning retardation, memory ability and anxiety reaction, experimental animals were composed of YST, HDS+restraint stress groups which were administered each by 400mg/kg, no stress group and the Saline+restraint stress group. Restraint stress were applied 2 hours a day for 3 weeks. On the last day of the 3rd week, Elevated Plus Maze(EPM) was applied to the groups and Morris Water Maze(MWM) was applied to the groups for 7 days. 3. Results 1. As the results of measuring FST which reflects depression, the YST+stress group and the HDS+stress group showed significant effect in comparison with the Saline+stress group. The levels of Corticosterone in the blood were decreased only in the 400mg/kg YST+stress group. 2. As the results of measuring how long EPM which reflects anxiety reaction stayed in the open arm, there was the trend which can suppress anxiety reaction in the HDS+restraint stress group bur no statistical significance. But there was any suppression of anxiety reaction in the YST+restraint stress group. 3. According to the result of MWM, the saline+restraint stress group showed the learning retardation which means increased time arriving at goal compared to the normal group at the second and third day of measurement. On the contrary, a learning retardation was significantly decreased in the YST+restraint stress group at the third day of measurement. 4. Among the Probe trial test a memory loss occurred in the saline+restraint stress group, but memory ability was significantly increased in the YST+restraint stress group. 4. Conclusion: As the results above, Soyangin Yanggyeoksanhwa-tang has significant influence to the antidepression effect, the learning retardation, the anxiety reaction and also in the Hormone level. Hyeongbangdojeok-san has significant influence to the antidepression effect, in the Hormone level, bur not to the learning retardation and anxiety reaction. prefer to drink cold water, and who are suffering from chronic gastritis.

• Journal of Genetic Medicine
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• 제2권2호
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• pp.83-86
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• 1998

Though Fragile X syndrome is one of the most common inherited causes of mental retardation, it is not much detected yet in Korean population. One of the reason may be that the syndrome is not well known to the special education teachers as well as to the clinicians in this country. Thus, molecular test was undertaken to screen out fragile X syndrome in 122 children of two Korean schools for emotionally severely handicapped children. The subjects were all boys, previously known as having pervasive developmental disorder with or without mental retardation. Southern blot analysis of peripheral blood showed the abnormally enlarged (CGG)n repeat sequence associated with fragile X syndrome in two children. This finding suggests that the DNA testing for fragile X syndrome is warranted for Korean high risk population and that more concern about this syndrome is needed for the professionals who work for mentally handicapped children. The issues involved in genetic counseling for fragile X syndrome are discussed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.481-485
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• 1997

6063-T5 alloys are tested in laboratory air, water and 3% NaCl solution to investigate the effects of corrosive environment on the retardation behavior through single overload fatigue test. Also, the fatigue crack propagation and the crack closure behavior are studied. The results obtained in this experimental study are summarized as follows: 1) Behaviors of fatigue crack growth retardation are observed in water and 3% NaCl solution as they do in air. The number of delay cycles and the size of affected region by single overload decrease greatly in water and 3% NaCl compared with those in air. 2) In fractographic results, the overload marking by single overload appear remarkably in air, but indistinctly in water and 3% NaCl solution. 3) The effect of crack closure on crack propagation is most remarkable in the beginning of crack propagation. With crack propagation, the crack closure level and its effect decrease greatly.

• 대한지하수환경학회지
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• 제5권3호
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• pp.155-161
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• 1998

토립자 표면에서의 흡착에 의한 토양에서의 중금속의 지연효과는 잘 알려진 현상이다. 본 연구에서는 배치시험과 주상시험을 수행함으로써 사질 토양에서 Zn의 이동성에 대한 지연효과를 조사하였다. 주상시험은 파과곡선(BTC)으로 알려진 시간에 따른 용액의 농도를 측정함으로써 수행되었다. 추적자로는 10 g/L 농도의 NaCl과 ZnCl$_2$를 사용하였고, 각각의 용액을 토양시료의 상부경계에 순간주입한 후 정상류 상태에서 배출구로 빠져나온 용탈수의 농도를 EC-meter와 ICP-AES를 이용하여 측정하였다. 배치시험은 표준절차에 근거하여 이루어졌으며, 토양시료로부터 선별된 미세입자들을 다양한 초기농도의 ZnCl$_2$용액과 반응시켜 평형상태의 Zn 이온의 농도를 ICP를 이용하여 분석하였다. 주상시험의 결과는 i) ICP-AES에 의해 분석된 ZnCl$_2$의 첨두농도는 NaCl이나 총전기전도도로부터 구한 값보다 상당히 낮았고, ii) 두 종류의 추적자 모두 첨두농도의 도달시간은 상당히 일치하였다. 상대적으로 낮은 Zn의 농도는 Zn과 다른 양이온들간의 이온교환반응이 일어났고, 용탈수의 pH가 높은 값의 범위(7.0~7.9)에 있는 것으로 보아 Zn(OH)$_2$의 형태로 침전되었을 가능성이 있다는 것으로 설명될 수 있다. 첨두농도의 도달시간이 일치한다는 결과는 토양시료에서 지연효과가 일어나지 않았다는 것을 지시한다. Zn 이온의 뚜렷한 감소를 설명할 수 있는 유일한 방법은 CDE 모델에 용액상태에서 Zn 이온의 절대적 감소를 고려하는 감쇄계수(decay or sink coefficient)를 적용하는 것이었다.