• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2008년도 학술논문요약집
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• pp.183-184
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• 2008

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 춘계 학술대회지
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• pp.163-164
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• 1998

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 추계학술논문요약집
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• pp.347-348
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• 2017

• 음성과학
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• 제9권3호
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• pp.35-45
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• 2002

A simple algorithm for discriminating voiced sounds in a speech is proposed. In addition to low-frequency energy and zero-crossing rate (ZCR), both of which have been widely used in the past for identifying voiced sounds, the proposed algorithm incorporates pitch variation to improve the discrimination rate. Based on TIMIT corpus, evaluation result shows an improvement of 13% in the discrimination of voiced phonemes over that of the traditional algorithm using only energy and ZCR.

• Bulletin of the Korean Chemical Society
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• 제34권2호
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• pp.677-679
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• 2013

• 한국수자원학회논문집
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• 제55권spc1호
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• pp.1223-1234
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• 2022

기후변화에 대처하기 위한 온실가스 저감 노력은 상하수도 분야에서도 활발하게 진행되어 왔으며, 특히, 상수도 생산 및 공급과정에서 많은 에너지를 소비하는 상수관망의 에너지를 절감하기 위한 많은 기술개발이 이루어져왔다. 상수관망의 에너지 절감은 지형의 기복으로 발생되는 구조적 손실의 저감과 누수 및 마찰손실로 인한 운영 상 손실의 효율화를 통해 성취될 수 있음에도 실제 상수관망의 에너지 수지를 분석하는 단계에서 이들 인자들 상호간의 복합적 작용으로 인해 해석적인 접근뿐 아니라 수치모형을 이용한 모의에서도 한계를 노출하여 왔다. 본 연구에서는 지형의 기복, 누수 및 마찰손실의 유무에 따라 변화하는 유량, 압력수두 및 에너지를 5가지의 상수관망 상태(가설적 상태, 이상적 상태, 누수가 포함된 이상적 상태, 누수가 배제된 실제 상태, 실제 상태)에 대하여 수리 물리적 방정식을 도출하고, 이를 단순한 형태의 상수관망에 적용함으로서 에너지의 정량적 분석 및 분류, 각종 에너지 수지 구성요소별 분석과 이를 이용한 상수도 시스템의 에너지 진단이 가능하도록 하였다.

• 한국지열·수열에너지학회논문집
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• 제11권1호
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• pp.15-20
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• 2015

In this study, the optimization and performance characteristics of a cascade heat pump system was analyzed with the variation of low stage refrigerant charge amount. The cascade heat pump was designed and constructed with R134a and R410A as the refrigerant for high stage and low stage cycle, respectively. Experiments were conducted by varying the low stage charge amount and the performance characteristics of the cascade heat pump were studied. The refrigerant charge amount of the low stage cycle was varied between the ranges of -15% and +10% of the optimum charge amount. The performance variation experienced in the cascade heat pump due to the variation of refrigerant charge amount shows greater effect in the undercharge regions than the overcharge regions. COP reduction in the undercharge region is larger than the decrease in the overcharge region. Some cycle variation such as power consumption and cycle pressure according to low stage refrigerant charge amount showed different trends comparing with those according to high stage refrrgerant charge amount. Therefore, the optimum charge amount of the cascade heat pump should be determined based on the experimental data obtained by the variation of high and low stage refrigerant charge amount.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.782-788
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• 2014

Wind power generation has been viewed as a promising renewable energy to meet challenge of climate change. However, wind power is susceptible to climate change because previous investigation shows there are declining trends of the land surface wind speeds over middle and lower latitudes. Since long term variation trends is notably different from inter-annual random variation and could have notable impact on wind farm from planning perspective, observed meteorological data of Taiwan is investigated to find out long term variation trends of wind speed and its impact on wind power generation. It is discovered that wind speed in majority of stations in west coast of Taiwan have ascending trends while that of all investigated stations in east coast have descending trends. Since east of Taiwan is not suitable for wind power development for its higher likelihood suffering Typhoons and most of established wind farm locate in west coast of Taiwan, it is speculated that long term variation trend of wind do not have notable negative impact on wind power generation in Taiwan.

• Applied Science and Convergence Technology
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• 제27권1호
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• pp.19-22
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• 2018

The ion energy and angle distributions (IEADs) in the DC magnetron sputtering systems are investigated for the variation of gas pressure using particle-in-cell simulation. Even for the condition of collisionless ion sheath at low pressure, it is possible to change the IEAD significantly with the change of gas pressure. The bombarding ions to the target with low energy and large incident angle are observed at low pressure when the sheath voltage drop is low. It is because the electron transport is hindered by the magnetic field at low pressure because of few collisions per electron gyromotion while the ions are not magnetized. Therefore, the space charge effect is the most dominant factor for the determination of IEADs in low-pressure magnetron sputtering discharges.

• International Journal of Oral Biology
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• 제34권2호
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• pp.49-52
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• 2009

Perception of sweet compounds is important for animals to detect external carbohydrate source of calories and plays a crucial role in feeding behavior of animals. Recent progress in molecular genetic studies provides evidence for a candidate receptor (heterodimers with taste receptor type 1 member 2 and 3: T1R2/T1R3), and major downstream transduction molecules required for sweet taste signaling. Several studies demonstrated that the sweet taste signal can be modulated by a satiety hormone, leptin, through its receptors expressed in a subset of sweet-sensitive taste cells. Increase of internal energy storage in the adipose tissue leads to increase in the plasma leptin level which can reduce activities of sweet-sensitive cells. In human, thus, diurnal variation of plasma leptin level parallels variation of taste recognition thresholds for sweet compounds. This leptin modulation of sweet taste sensitivity may influence individuals' preference, ingestive behavior, and absorption of nutrients, thereby plays important roles in regulation of energy homeostasis.