• Journal of Digital Convergence
• /
• v.11 no.6
• /
• pp.169-174
• /
• 2013

Speech recognition, the problem of performance degradation is the difference between the model training and recognition environments. Silence features normalized using the method as a way to reduce the inconsistency of such an environment. Silence features normalized way of existing in the low signal-to-noise ratio. Increase the energy level of the silence interval for voice and non-voice classification accuracy due to the falling. There is a problem in the recognition performance is degraded. This paper proposed a robust speech detection method in noisy environments using a silence feature normalization and voice energy maximize. In the high signal-to-noise ratio for the proposed method was used to maximize the characteristics receive less characterized the effects of noise by the voice energy. Cepstral feature distribution of voice / non-voice characteristics in the low signal-to-noise ratio and improves the recognition performance. Result of the recognition experiment, recognition performance improved compared to the conventional method.

• Korean Journal of Construction Engineering and Management
• /
• v.1 no.1 s.1
• /
• pp.80-86
• /
• 2000

The future costs of energy and the cost of the repair of apartment buildings are expected to rise continuously in proportion to the initial costs. Therefore it has become important for these increasing costs to be incorporated and reflected in the design of the building. Systems such as structure and services for the buildings remain constant, but a number of the walls and windows can vary and thus have a major influence on the total construction and running costs of a building. The critical factor in the apartment unit design for the optimization of life cycle cost (LCC) is the ratio of the x and y axis of the walls in the unit plan. This paper demonstrates how to achieve the optimal size and thus optimize the LCC of the building.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.11 no.1
• /
• pp.20-33
• /
• 1999

The evolution of deep-sea waves is driven by energy input from wind, nonlinear energy transfer between wave components, and dissipation through whitecaps. A comparative study was implemented by the use of two wave models in which only the computation methods of nonlinear wave-wave interactions are different from each other. It was reaffirmed that the nonlinear interaction plays a central role in such phenomena that occurred during the spectral growth of wind-seas as down-shift of the spectral peak frequency, overshoot, undershoot, and formation of self-similar spectrum. Specifically, the directional distribution at high frequencies develops into bimodal form, which is attributed to the nonlinear interactions. As saturation stage is reached, spectral density at high frequencies becomes proportional to negative 4 power to the frequency. Perturbations introduced into the spectrum quickly vanished through the actions of the self-similar mechanism. Thus, the nonlinear transfer has important contribution to the stability of numerical ocean wave models.

• Environmental and Resource Economics Review
• /
• v.24 no.1
• /
• pp.109-139
• /
• 2015

Referring to many previous research on the statistical differences in the figures of energy balance table between that of KEEI and IEA, a study is conducted to provide with a framework for proper comparison, followed by the actual calculation of the differences. Major differences are found for energy oil with its size of over 32% differences in primary energy supply and in energy transformation sectors. In final energy consumption sector, naptha consumption for petro-chemical industry shows 14.58% differences. Overall final energy consumption figure of KEEI after its adjustment to net calorific value as is the case of that of IEA is 3.58% larger than that of IEA. Considering the fact that energy balance table provides the basic information for the understanding of energy sector, further studies seem to be necessary for proper adjustment of current status.

• Journal of Environmental Impact Assessment
• /
• v.25 no.4
• /
• pp.261-279
• /
• 2016

Trends of food and energy consumptions in South Korea, North Korea, and the Korean Peninsula were shown and consumptions of food and energy for the integrated Korean Peninsula with several Cases were predicted, and the directions for the environmental resources management were suggested in this study. The Food Supply Quantity, the Protein Supply Quantity, and the Food Supply of North Korea were less than those of South Korea, the Eastern Asia, and World after 1990s. However, it is expected that the food consumption in North Korea will increase, if two Koreas are integrated. If the Food Supply Quantity of North Korea is the same as that of South Korea with the maximum projected population of integrated two Koreas by 2055, the food consumption in the Korean Peninsula would increase by 25% compared with the 2011 food consumption of integrated two Koreas. Thus, the choice of diet should be carefully considered and the increase of agricultural productivity is required. Energy consumption in North Korea is very small comparing to that of South Korea and fraction of coal in energy usage of North Korea is very high. If the energy consumption per capita of North Korea after integration be the same as that of South Korea in 2011, the energy consumption in the Korean Peninsula would increase by 45% compared with the 2011 energy consumption of integrated two Koreas. To minimize the environmental effects caused by energy consumption, the energy plan with the reduced fraction of coal in energy supply of North Korea should be adopted and advanced technology with higher efficiency should be applied to establish or expand the energy facility in North Korea.

• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 2000.04a
• /
• pp.159-169
• /
• 2000

본논문에서는 강섬유 철근 콘크리트 보(SFRC) 의 감쇄 거동에 대해서 실험적인 방법과 수치 해석적인 방법으로 연구를 수행하였다 SFRC는 보다 향상된 에너지 소산능력으로 일반 철근 콘크리트보에 비하여 뛰어난 감쇄 거동을 보인다. 감쇄거동은 종방향 철근비강섬유의 형태와 부피 콘크리트 강도 응력 수준등에 의해 영향을 받는다 SFRC보의 감쇠는 다양한 수준의 균열상태에서의 동적실험 데이터를 통하여 평가하였다 곡률과 감쇠의 관계식에 기초한 유한요소 프로그램(TICAL) 이 개발되었으며 0.44%의 강섬유를 혼입한 보의 경우 5-35%의 감쇠비 증가를 보였다

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 2002.05a
• /
• pp.251-254
• /
• 2002

폐기물을 대상으로 하는 가스화공정은 환경문제와 에너지효율 문제를 동시에 접근할 수 있는 공정으로서 향후 연소반응에 근거한 공정을 점차 대체할 것으로 예측되고 있다. 국내에서도 '80년대 이후 선진국에 비해서는 소규모이지만 나름대로의 가스화기술에 대한 기반 연구를 진행시켜 왔고, 폐기물 분야에는 상용급으로 실용화할 수 있는 규모의 실플랜트 운용기술이 개발되고 있다.(중략)

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 1999.05a
• /
• pp.103-106
• /
• 1999

감손우라늄(depleted uranium, DU)은 천연 우라늄에서 핵분열 물질인 U-235를 농축하는 과정에서 발생한다. U-235의 농도가 0.45%인 감손우라늄의 비방사능은 천연우라늄의 약70.8%에 분과하나 감손우라늄은 밀도가 19g/㎤으로 높고 천연우라늄에 비해 U-235의 농도가 상대적으로 낮기 때문에 외국의 경우는 방사선의 차폐체, 비행기나 헬리콥터 및 미사일의 무게중심제(counter-weight)로 사용되며 또한 플라이 휠 등 큰 내부에너지 저장을 위한 장치 등에 널리 이용되고 있다.(중략)

• Proceedings of the Korean Society of Applied Pharmacology
• /
• 2001.04a
• /
• pp.33-42
• /
• 2001

최근 수년간 에너지 섭취와 소비의 균형을 유지하는 것과 깨지는 것에 대한 생리적 기전에 대하여 많은 것이 알려졌다. 비만 만연의 사회적 문제점, 치료해야할 필요성, 음식섭취와 에너지 항상성의 조절 기전, 이와 관련된 물질과 수용체의 기능과 가치, 잠재력 있는 조절인자의 대상에 대하여 기술하였다. 비만은 여러 생리과정의 총화이므로 신체의 즉각적, 장기적 에너지 수요를 원활하게 조절하는 다양한 분자신호전달체계에 각각 작용하는 물질을 찾아 함께 사용하도록 하는 것이 새로운 비만치료제를 개발하는 전략이다.

• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 2003.09a
• /
• pp.213-220
• /
• 2003

고층의 강 모멘트저항골조에 대한 지진 반응을 살펴보기 위해서 동적해석을 실시하였다. 구조물은 세가지의 다른 설계절차로 의도적으로 설계하였고 그 세가지의 개념은 강도 지배설계, 강기둥-약보 지배설계, 횡변위 지배설계이다. 그렇게 설계한 구조물이 각각 질량비정형이 존재하도록 하여 힁변위, 소성힌지, 이력에너지 입력 및 요구응력에 대해서 토론하였다. 미래에 설계에의 응용을 위해서 최대 지반가속도로 표현한 두 등급의 지진 하중을 이용해서 이력에너지 입력요구 곡선을 제시하였다.