• 한국식품조리과학회지
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• 제27권6호
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• pp.681-689
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• 2011

Yakkong germinated for 48 h at $23^{\circ}C$(48G), which showed the highest isoflavone content, was prepared with no heat treatment(48G-NH) or with additional heat treatment entailing 20 min boiling(48G-20B) or 15 min roasting(48G-15R). After being ground, each powder was substituted for rice flour by 10, 20, or 30% in rice cookies and compare with the control(100% rice flour cookies). The rice cookies containing 20 or 30% 48G-NH showed the highest crispness in texture and the lowest spreadability. The rice cookies containing 48G-20B and 48G-15R did not show a change in spreadibility, regardless of substitution level. For the rice cookies with 48G-15R, when the substitution level increased to 30%, the crispness decreased and hardness increased. The rice cookies with 48G-20B showed the lowest crispness regardless of substitution level. In terms of color, rice cookies substituted with Yakkong powder showed lower L and higher a* values than the control, however there were no tendencies related to b* value change. In sensory testing, rice cookies substituted with YK-48G had an improved quality, especially in flavor and texture as well as in function. The most acceptable substitution level was 20% of 48G-15R.

• 자원환경지질
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• 제37권1호
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• pp.35-48
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• 2004

본 논문에서는 폐광산지역의 오염특성 조사와 평가를 위한 지구화학적 접근방법에 대하여 정리ㆍ기술하였다. 폐광산지역의 주요 오염원은 갱내수, 광석, 광미 및 선광을 위해 사용한 화학약품 등이고 산성광산배수의 배출, 광산폐기물의 유실, 유해성 침출수의 배출, 광미와 분진의 분산 등에 의해 중금속이 이동/확산되어 주변토양, 퇴적물, 지표수, 지하수, 생태계에 광역적/지속적으로 심각한 영향을 미친다. 따라서 오염원, 주변 토양, 지표수, 지하수 등에 대한 화학분석, 광물학적분석, 광산산성배수 예측실험, 물리/지화학탐사와 같은 현장실험 등의 방법을 이용한 조사를 통해 폐광산이 주변 환경에 미치는 잠재적이고 실제적인 영향이 조사$.$평가 되어야한다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제12권3호
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• pp.320-330
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• 2012

In this paper, we investigate the power integrity of grid structures for power and ground distribution on printed circuit board (PCB). We propose the 2D transmission line method (TLM)-based model for efficient frequency-dependent impedance characterization and PCB-package-integrated circuit (IC) co-simulation. The model includes an equivalent circuit model of fringing capacitance and probing ports. The accuracy of the proposed grid model is verified with test structure measurements and 3D electromagnetic (EM) simulations. If the grid structures replace the plane structures in PCBs, they should provide effective shielding of the electromagnetic interference in mobile systems. An analytical model to predict the shielding effectiveness (SE) of the grid structures is proposed and verified with EM simulations.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 춘계종합학술대회
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• pp.100-103
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• 2003

본 논문에서는 2.4GHz 대역의 근거리 무선 통신에 사용되는 역-F형 내부 안테나의 설계 값에 따른 안테나 특성을 분석하였다. PCB 기판에 인쇄된 형태로 설계하여 안테나의 길이, 단락 스터브의 두께, 피드선과 단락 스터브 사이의 간격, 안테나와 그라운드 사이의 간격, 안테나의 두께 및 기판의 두께와 기판의 유전율에 따른 특성 변화를 연구하였다. 설계값에 따른 특성변화 그래프로부터 설계값을 튜닝하여 최적의 안테나를 설계하는 방법을 보였다. 설계된 안테나는 VSWR이 1.5이하인 주파수 대역폭이 6.3%, 이득 3dB 정도를 얻었다.

• Earthquakes and Structures
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• 제9권4호
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• pp.719-733
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• 2015

Seismic risk management of the built environment is integrated by two main stages, the assessment and the remedial measures to attain its reduction, representing both stages a complex task. The seismic risk of a certain structure located in a seismic zone is determined by the conjunct of the seismic hazard and its structural vulnerability. The hazard level mainly depends on the proximity of the site to a seismic source. On the other hand, the ground shaking depends on the seismic source, geology and topography of the site, but definitely on the inherent earthquake characteristics. Seismic hazard characterization of a site under study is suggested to be estimated by a combination of studies with the history of earthquakes. In this Paper, the most important methods of seismic vulnerability evaluation of buildings and their application are described. The selection of the most suitable method depends on different factors such as number of buildings, importance, available data and aim of the study. These approaches are classified in empirical, analytical, experimental and hybrid. For obtaining more reliable results, it is recommends applying a hybrid approach, which consists of a combination between methods depending on the case. Finally, a recommended approach depending on the building importance and aim of the study is described.

• Smart Structures and Systems
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• 제8권1호
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• pp.93-105
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• 2011

This paper presents a flexible low-profile antenna sensor for fatigue crack detection and monitoring. The sensor was inspired by the sense of pain in bio-systems as a protection mechanism. Because the antenna sensor does not need wiring for power supply or data transmission, it is an ideal candidate as sensing elements for the implementation of engineering sensor skins with a dense sensor distribution. Based on the principle of microstrip patch antenna, the antenna sensor is essentially an electromagnetic cavity that radiates at certain resonant frequencies. By implementing a metallic structure as the ground plane of the antenna sensor, crack development in the metallic structure due to fatigue loading can be detected from the resonant frequency shift of the antenna sensor. A monostatic microwave radar system was developed to interrogate the antenna sensor remotely. Fabrication and characterization of the antenna sensor for crack monitoring as well as the implementation of the remote interrogation system are presented.

• 한국정보통신학회논문지
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• 제7권6호
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• pp.1103-1108
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• 2003

본 논문에서는 2.4GHz 대역의 근거리 무선 통신에 사용되는 역-F형 내부 안테나의 설계 값에 따른 안테나 특성을 분석하였다. PCB 기판에 인쇄된 형태로 설계하여 안테나의 길이, 단락 스터브의 두께, 피드선과 단락 스터브 사이의 간격, 안테나와 접지면 사이의 간격, 안테나의 두께 및 기판의 두께와 기판의 유전율에 따른 특성 변화를 연구하였다. 설계값에 따른 특성변화 그래프로부터 설계값을 튜닝하여 최적의 안테나를 설계하였다. 설계된 안테나는 VSWR이 1.5이하인 주파수 대역폭이 6.3%, 이득 3dB 정도를 얻었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.699-704
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• 2001

Until recently, disposal to landfill has been the most convenient way to deal with the increasing amount of residues the shredding industries produce. But the shortage of such disposal sites and the risk that liquid drained from these waste dusts may pollute ground water have increased the environmental pressures to find more effective solutions. The present study is an alternative approach that suggests identifying waste dusts characteristics and selecting an appropriate binder for hazardous materials to reduce the amount of contaminants (mainly lead) that were leaking into the soil. Investigations on the characteristics of automobiles waste dusts show that these materials are composed mainly of cottons and sponge like substances, plastics, rubber, glasses and gravel, metals, and electric wires. Besides, the percentage in weight of organic (inflammable) materials is about 70% and the lead contamination, which has not a ionic but a particulate nature, is particularly remarkable in cottons and sponge like materials. Binding additives such as K-20 and sodium carbonate were not effective but the addition of 5 % of cement (in weight of the investigated sample) followed by a 3-minute stirring and a 4-hour storage could drastically reduce the run off of lead below the maximum authorized level. No addition of water was necessary in this method.

• 한국지진공학회논문집
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• 제5권6호
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• pp.1-10
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• 2001

본 연구에서는 수평전단시험을 통하여 LRB(lead-rubber hearing)의 동적 특성을 분석하였다. 10ton 및 200ton 용량의 LRB를 이용하여 수평전단시험을 수행한 결과 LRB의 동적 특성은 수평하중의 재하속도, 연직하중의 크기 및 전단변형률 등에 따라 크게 달라지는 것으로 나타났다. 세장비가 큰 면진장치에 과도한 변형을 가할 경우 내부 납심에 소성한지가 발생되어 납심이 파괴되는 것으로 나타났다. 따라서 면진구조물의 설계 및 해석 시에는 지진응답과 재하하중의 크기에 따라서 달라지는 LRB의 기계적 특성치를 적용하여 안전한 설계가 이루어질 수 있도록 하여야 한다.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.335-339
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• 2003

The estimation of seawater intrusion into deep aquifers has been becoming an important subject in terms of site characterization for geological disposal of radioactive waste. Conventional direct-current resistivity methods have been used for ground water explorations and recently have been applied to environmental problems. However, electromagnetic methods are more practical and useful for such a deep investigation. We consider audio-frequency magnetotelluric (AMT) and surface-to-borehole electromagnetic (EM) tomography methods as promising tools for the investigation of deep aquifer. These methods were tested in the Hasunuma area, Chiba Prefecture, Japan. Although the study area is in an urban area, high-quality AMT data were acquired, which was mainly accomplished by night-time data recording and remote-reference data processing. One-dimensional inversion results of the AMT data revealed two extremely conductive zones, which is consistent with the electrical conductivity profile of pore water in core samples. It can be interpreted as the seawater intrusions into both zones. However, the chemical analysis of the groundwater sampled in the deep zone suggests that this groundwater must be fossil seawater that had been confined during sedimentation processes. In addition, the permeability coefficient of the deep layer is very low. Thus the deep conductive zone corresponds to the fossil seawater regarded as being difficult to flow.