• 제목/요약/키워드: Technology-Fusion research

검색결과 1,081건 처리시간 0.026초

Theoretical Calculations of Infrared Bands of CH3+ and CH5+

  • Matin, Mohammad A.;Jang, Joonkyung;Park, Seung Min
    • Bulletin of the Korean Chemical Society
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    • 제34권7호
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    • pp.2051-2055
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    • 2013
  • Existing theoretical calculations predict that infrared spectra of the two most fundamental reactive carbo-ions, methyl cation $CH{_3}^+$ with $D_{3h}$ symmetry and protonated methyl cation $CH{_5}^+$ with $C_s(I)$, $C_s(II)$, and $C_{2v}$ symmetries, appear together in the 7-${\mu}m$ region corresponding to the C-H bending modes. Vibrational band profiles of $CH{_3}^+$ and $CH{_5}^+$ have been compared by ab initio calculation methods that use the basis sets of MP2/aug-cc-pVTZ and CCSD(T)/cc-pVTZ. Our results indicate that the bands of rotation-vibration transitions of $CH{_3}^+$ and $CH{_5}^+$ should overlap not only in the 3-${\mu}m$ region corresponding to the C-H stretching modes but also in the 7-${\mu}m$ region corresponding to the C-H bending modes. Five band intensities of $CH{_5}^+$ among fifteen vibrational transitions between 6 and 8 ${\mu}m$ region are stronger than those of the ${\nu}_2$ and ${\nu}_4$ bands in $CH{_3}^+$. Ultimate near degeneracy of the two bending vibrations ${\nu}_2$ and ${\nu}_4$ of $CH{_3}^+$along with the stronger intensities of $CH{_5}^+$ in the three hydrogen scrambling structures may cause extreme complications in the analysis of the high-resolution carbo-ion spectra in the 7-${\mu}m$ region.

장비에 따른 3차원 공간정보 품질향상 요인추출 및 집단 간 선호도에 관한 연구 (A Study on the Preference by Groups and Quality Improvement Surveying of the Important Factor of 3D Spatial Information by Equipment)

  • 오민균;배상태;김태우;이정일
    • 지적과 국토정보
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    • 제46권1호
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    • pp.3-21
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    • 2016
  • 본 연구에서는 공중 및 지상장비에 따른 3차원 공간정보 구축의 핵심요인을 분석하고 선호도 조사를 통하여 품질 향상 방안을 도출하였다. 이는 3차원 공간정보 구축을 위한 개별 기술 요소에 대하여 품질에 영향을 미치는 요인을 조사하고, 개선이 요구되는 우선순위를 파악하여 이에 대한 요인 평가 및 대안기술 개발과 적용 등의 자료로 활용하기 위함이다. 이를 위해 3차원 공간정보를 바라보는 집단 간 견해차의 선호도 조사를 통하여 공간정보 및 측량에 종사하는 전문가 집단과 일반적으로 3차원 공간정보를 경험한 비전문가 집단을 대상으로 동일성 유무를 계량적 기법에 의해 판단하였다.

폐열회수시설이 설비된 생활폐기물 소각자원화시설 온실가스 배출량 산정 시 오차분석 (2009~2013) (Study on the Measurement of GHG Emissions and Error Analysis in Form the MSW Incineration Plant Equipment with the Recovery Heat System (2009~2013))

  • 최원근;서란숙;박승철
    • 한국환경과학회지
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    • 제25권2호
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    • pp.239-246
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    • 2016
  • This study aims to analyze region-specific trends in changing greenhouse gas emissions in incineration plants of local government where waste heat generated during incineration are reused for the recent five years (2009 to 2013). The greenhouse gas generated from the incineration plants is largely $CO_2$ with a small amount of $CH_4$ and $N_2O$. Most of the incineration plants operated by local government produce steam with waste heat generated from incineration to produce electricity or reuse it for hot water/heating and resident convenience. And steam in some industrial complexes is supplied to companies who require it for obtaining resources for local government or incineration plants. All incineration plants, research targets of this study, are using LNG or diesel fuel as auxiliary fuel for incinerating wastes and some of the facilities are using LFG(Landfill Gas). The calculation of greenhouse gas generated during waste incineration was according to the Local Government's Greenhouse Emissions Calculation Guideline. As a result of calculation, the total amount of greenhouse gas released from all incineration plants for five years was about $3,174,000tCO_2eq$. To look at it by year, the biggest amount was about $877,000tCO_2eq$ in 2013. To look at it by region, Gyeonggido showed the biggest amount (about $163,000tCO_2eq$ annually) and the greenhouse gas emissions per capita was the highest in Ulsan Metropolitan City(about $154kCO_2eq$ annually). As a result of greenhouse gas emissions calculation, some incineration plants showed more emissions by heat recovery than by incineration, which rather reduced the total amount of greenhouse gas emissions. For more accurate calculation of greenhouse gas emissions in the future, input data management system needs to be improved.

뉴에콜로지 패션에 관(關)한 연구(硏究) (A Study on the New Ecology Fashion)

  • 하민아;조규화
    • 패션비즈니스
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    • 제4권3호
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    • pp.15-33
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    • 2000
  • The purpose of this thesis is to suggest the new ecology fashion through the comprehensive approach to analyze the difference of characteristics between ecology fashion established before the early 1990's and new ecology fashion advented in the late 1990's and create the design inspired by the image of new ecology fashion. As a method of accomplishing this research, the articles and magazines related to the fashion were examained. Also internet was surfied for studying social and cultural background of new ecology and examining the trend of new ecology expressed at design at first. Through examining the fashion mode in the late 1990's related to the trend of new ecology, the characteristics of new ecology fashion have been devided by the fabric, color and detail and drown out three images of new ecology fashion. The cultural background of new ecology is advent of fusion, techno and zen culture in the late 1990's. The characteristics of new ecology fashion are as follows. As regards of the fabrics, It's been used naturalized synthetic fabrics such as lycra and tencel produced by the advanced technology as well as luxurious natural fabrics. As the aspect of colors, on the basis of neutral colors shown to the previous ecology fashion, the wide range of colors including the vivid colors has been presented sophisticatedly. The most evident characteristic of new ecology fashion is the increase of details, along with keeping the minimal style. According to this trend of new ecology fashion, three charicteristic images can be extracted ; the techno ecology, the modern ecology and the romantic ecology. As the megatrend sustained during the late 1990's, the trend of new ecology was the mainstream not only of the fashion but also of the human life style, and has the potential continued in the 2000's.

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PPG 및 ECG 센서를 이용한 혈압추정 기법 개발 (Development of Blood Pressure Estimation Methods Using The PPG and ECG Sensors)

  • 박현문;이정철;황태호
    • 한국전자통신학회논문지
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    • 제14권6호
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    • pp.1257-1264
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    • 2019
  • 기존의 Cuff 기반의 혈압(Blood Pressure)측정 방법은 연속적인 실시간 혈압측정에는 한계를 갖는다. 이러한 이유로 ECG와 PPG 센서 신호를 상호융합한 다양한 혈압추정이 이루어졌다. 그러나 PPG 중심에 측정기법은 AC 노이즈, 작은 맥동, 비박동 등의 많은 문제를 지니고 있다. 본 논문은 ECG와 PPG 관계에 발생하는 맥파전달시간(PTT)과 맥파속도(PWV)를 이용하여 혈압을 추론기법이다. 신호 피크를 이용하는 HRF(Height Ratio Features)에 비해, 본 제안방식은 ECG, PPG의 최고점 혹은 최저점을 사용한 시차를 이용해 추정하기 때문에 PPG 센싱 시그널의 오류에도 안정적인 추출이 가능한 장점이 있다. 본 논문에서 제안 방법을 이용하여 25만 회의 혈압측정의 결과 ±28.5%의 정확도를 갖는 혈압 추정기법을 제시할 수 있었다.

Effects of Hydrogen Sulfide and Siloxane on Landfill Gas Utility Facilities

  • Nam, Sang-Chul;Hur, Kwang-Beom;Lee, Nam-Hoon
    • Environmental Engineering Research
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    • 제16권3호
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    • pp.159-164
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    • 2011
  • This study examined the emission characteristics of impure gas-like hydrogen sulfide and siloxane contained in landfill gas (LFG) and investigated the effect of impure gas on LFG utility facilities. As a result of an LFG component analysis from eight landfills in the same environment, hydrogen sulfide averaged 436 ppmv (22-1,211 ppmv), and the concentration of total siloxane averaged 7.95 mg/$m^3$ (1.85-21.18 mg/$m^3$). In case of siloxane concentration by component, the ratio of D4 (average 3.79 mg/$m^3$) and D5 (average 2.64 mg/$m^3$) indicated the highest level. Different kinds of scales were found on the gas air heater (GAH) and inside the boiler. The major component of scale from the GAH was $Fe_2O_3$ of 38.5%, and it was caused by hydrogen sulfide. Other scale was found on the bottom and the wall of the boiler and the scale was silicon dioxide of 92.8% and 98.9%. The silicon dioxide scale was caused by combustion of siloxane. As a result of a scanning electron microscopy analysis, the structure of the silicon dioxide scale from the boiler was an immediate filamentous type. Consequently, as silicon dioxide scale is bulky, such bad effects were worsening, as an interruption in heat conduction, increase in fuel consumption, damage to the boiler by overheating, and clogged emission pipeline could occur in LFG utility facilities.

Impedance Parameter Variations at Intravenous (IV) Infiltration Using Bioelectrical Impedance: A Pilot Study

  • Kim, Jaehyung;Lee, Mansup;Baik, Seungwan;Kim, Gunho;Hwang, Youngjun;Jeon, Gyerok
    • 한국멀티미디어학회논문지
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    • 제20권10호
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    • pp.1678-1688
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    • 2017
  • Infiltration is one of detrimental problems occurring in nursing or medical settings. Early detection of infiltration is essential to minimize the risk of injury from infiltration. To perform a preliminary study on the point of care and automated infiltration detection system, bioelectrical impedance was investigated using bioelectrical impedance analyzer. We would like to report experimental results that allow impedance parameters to effectively distinguish infiltration. Electrodes were attached to both sides of the transparent dressing on the fusion site where IV solution was being infused. Then, impedance parameters before and after infiltration were measured as a function of time and frequency. The experimental results are as follows. After infiltration was intentionally induced by puncturing the vein wall with a needle, the resistance gradually decreased with time. That is, when an alternating current having a frequency of 20 kHz was applied to the electrodes, the resistance gradually decreased with time, reflecting the accumulation of IV solution in the extracellular fluid since the current could not pass through the cell membrane. Impedance parameters and equivalent circuit model for human cell were used to examine the mechanism of current flow before and after infiltration, which could be used for early detection of infiltration.

독거노인의 자살생각 영향 요인에 대한 융합연구 (A Converged Study on the Influence on the Suicide of Idea the Elderly Living Alone.)

  • 김정숙
    • 융합정보논문지
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    • 제8권5호
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    • pp.11-17
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    • 2018
  • 본 연구는 독거노인의 자살영향요인에 영향을 미치는 요인을 파악하기 위해 시도 되었다. 본 연구는 K & C 지역에 거주하는 독거노인 175명을 대상으로 한 융합적 서술조사연구이며 자료는 SPSS/WIN 21.0을 이용하여 t-test, ANOVA, Pearson's correlation coefficients 산출 및 다중희귀분석을 실시하였다. 자료수집은 2017년 1월 부터 2017년 3월까지 였다. 본 연구결과는 다음과 같다. 자살생각은 사회활동(r=-.106, p<.05), 주관적 건강상태(r=-.292, p<.01), 자아존중감(r=-.069, p<.05), 자기통제감(r=-.201, p<.01)과 부적 상관관계를 보였고, 우울(r=.023, p<.01), 스트레스(r=.320 p<.05)는 자살과 양의 상관관계를 보였다. 또한 자살생각에 영향을 미치는 요인은 주관적 건강상태, 자아통제감, 사회활동 순으로 나타났고, 총 43.5%의 설명력을 나타났다. 독거노인의 자살을 예방하기 위해서는 자살요인을 파악하고 건강상태, 사회활동, 자아존중감, 자기통제감 관련하여 상담 및 프로그램을 마련해야 할 것이며 자살예방을 돕는 적극적인 간호중재의 모색이 필요하다 하겠다.

Evaluation of Grooving Corrosion and Electrochemical Properties of H2S Containing Oil/Gas Transportation Pipes Manufactured by Electric Resistance Welding

  • Rahman, Maksudur;Murugan, Siva Prasad;Ji, Changwook;Cho, Yong Jin;Cheon, Joo-Yong;Park, Yeong-Do
    • Corrosion Science and Technology
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    • 제17권3호
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    • pp.109-115
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    • 2018
  • Electrical Resistance Welding (ERW) on a longitudinal seam-welded pipe has been extensively used in oil and gas pipelines. It is well known that the weld zone commonly suffers from grooving corrosion in ERW pipes. In this paper, the grooving corrosion performances of API X65 grade non-sour service (steel-A) and API X70 grade sour gas resistant (steel-B) steel electrical resistance welding pipelines were evaluated. The microstructure of the bondline is composed of coarse polygonal ferrite grains and several elongated pearlites. The elongated pattern is mainly concentrated in the center of the welded area. The grooving corrosion test and electrochemical polarization test were conducted to study the corrosion behavior of the given materials. A V-shaped corrosion groove was found at the center of the fusion zone in both the steel-A and steel-B ERW pipes, as the corrosion rate of the bondlines is higher than that of the base metal. Furthermore, the higher volume fraction of pearlite at the bondline was responsible for the higher corrosion rate at the bondline of both types of steel.

IEEE 802.15.4g SUN 시스템용 RF 주파수 합성기의 구현 (Implementation of RF Frequency Synthesizer for IEEE 802.15.4g SUN System)

  • 김동식;윤원상;채상훈;강호용
    • 전자공학회논문지
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    • 제53권12호
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    • pp.57-63
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    • 2016
  • 본 논문은 $0.18{\mu}m$ 실리콘 CMOS 기술을 이용한 IEEE802.15.4g SUN 체계의 센서노드 무선통신부에 적용할 수 있는 RF 주파수 합성기의 구현에 대하여 기술하였다. 제안한 주파수 합성기는 고속 저잡음 특성을 얻기 위하여 VCO, 프리스케일러, 1/N 분주기, ${\Delta}-{\Sigma}$ 모듈레이터 그리고 PLL 공통 회로 등의 설계 최적화가 이루어졌으며, 특히 VCO는 NP 코어 구조와 13단 캡 뱅크를 각각 적용하여 고속, 저잡음 및 광대역 튜닝 범위를 확보하였다. 제안된 주파수 합성기를 칩으로 제작하여 측정한 결과 출력 주파수 범위는 1483MHz~2017MHz, 위상잡음은 100KHz 오프셋에서는 -98.63dBc/Hz, 1MHz 오프셋에서는 -122.05dBc/Hz로 양호한 특성을 얻을 수 있었다.