• Title/Summary/Keyword: air-classification

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Characteristics and Application of Defatted Soybean Meal fractions Obtained by Microparticulation/Air-Classification (초미세분쇄/공기분급을 이용한 탈지대두박 분획물의 특성과 응용)

  • Park, Dong-June;Ku, Kyung-Hyung;Kim, Seung-Ho
    • Korean Journal of Food Science and Technology
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    • v.28 no.3
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    • pp.497-505
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    • 1996
  • Defatted soybean meal (DSM) was microparticulated at cut-off whell speed of 9.000 rpm and air-classified into fine and coarse fractions at air classifying wheel speeds (ACWS) of 21,000, 18,000, 15,000 12,000 and 9,000 rpm stepwisely. Protein and ash content increased while lipid, carbohydrates and dietary fiber content decreased with decreasing ACWS. Amino acid composition and amino acid content of defatted soybean meal were similar to those of raw soybeans with aspartic and glutamic acid, the major amino acids. The yield and particle size increased with decreasing ACWS and mean particle size ranged from $4.9{\mu}m$ to $14.2{\mu}m$. The particles were oval-shaped with sharp corners. Water holding capacity, oil holding capacity and emulsion capacity slightly decreased with decreasing ACWS. Soybean curds formed showed different characteristics depending on the coagulant used and on the substitution ratio of full fat soybean flour with microparticulated DSM. Microparticulated DSM could successfully substitute wheat flour up to 10% level without bring no-ticiable beany flavor in the cakes.

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Detection and Classification of Open-phase Faults in PMSM Using Extended Kalman Filter and Multiple Model (확장칼만필터 및 다중모델 기반 영구자석 동기전동기 권선 개방 고장의 검출 및 분류)

  • Minwoo Kim;Junhyeong Park;Sangho Ko
    • Journal of Aerospace System Engineering
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    • v.17 no.6
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    • pp.100-107
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    • 2023
  • Open-phase fault in a Permanent Magnet Synchronous Motor (PMSM) occurs due to disconnection of phases of motor windings or inverter switch failures. When an open-phase occurs, it leads to the generation of torque ripples and vibrations in the motor, which can have a critical impact on the safety of the vehicle (including aircraft) using a PMSM as an actuator. Therefore, rapid fault detection and classification are essential. This paper proposes a classification method for detecting open-phase faults and locating fault positions in a PMSM used in aircraft applications. The proposed approach uses an Extended Kalman Filter for fault diagnosis, and it subsequently classifies faults using a Multiple Model filter.

Classification and Condensation of Nano-sized Airborne Particles by Electrically Tuning Collection Size (포집크기의 전기적 튜닝 기술을 이용한 나노크기의 공기중 입자 분류 및 수농도 응축)

  • Kim, Yong-Ho;Kwon, Soon-Myoung;Park, Dong-Ho;Hwang, Jung-Ho;Kim, Yong-Jun
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1874-1879
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    • 2008
  • It is not easy to detect nano-sized airborne particles (< 100 nm in diameter) in air. Therefore, the condensation of the nanoparticles alongside of the size-classification is needed for their detection. This paper proposes a hybrid (aerodynamic+electrical) particle classification and condensation device using a micro virtual impactor (${\mu}VI$). The ${\mu}VI$ can classify the nanoparticles according to their size and condense the number concentration of nanoparticles interested. Firstly, the classification efficiency of the ${\mu}VI$ was measured for the particles, polystyrene latex (PSL), ranging from 80 to 250 nm in diameter. Secondly, the nanoparticles, NaCl of 50 nm in diameter, were condensed by 4 times higher. In consequence, the output signal was amplified by 4 times (before condensation: 4 fA, after condensation: 16 fA). It is expected that the proposed device will facilitate the detection of nanoparticles.

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Soft Independent Modeling of Class Analogy for Classifying Lumber Species Using Their Near-infrared Spectra

  • Yang, Sang-Yun;Park, Yonggun;Chung, Hyunwoo;Kim, Hyunbin;Park, Se-Yeong;Choi, In-Gyu;Kwon, Ohkyung;Yeo, Hwanmyeong
    • Journal of the Korean Wood Science and Technology
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    • v.47 no.1
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    • pp.101-109
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    • 2019
  • This paper examines the classification of five coniferous species, including larch (Larix kaempferi), red pine (Pinus densiflora), Korean pine (Pinus koraiensis), cedar (Cryptomeria japonica), and cypress (Chamaecyparis obtusa), using near-infrared (NIR) spectra. Fifty lumber samples were collected for each species. After air-drying the lumber, the NIR spectra (wavelength = 780-2500 nm) were acquired on the wide face of the lumber samples. Soft independent modeling of class analogy (SIMCA) was performed to classify the five species using their NIR spectra. Three types of spectra (raw, standard normal variated, and Savitzky-Golay $2^{nd}$ derivative) were used to compare the classification reliability of the SIMCA models. The SIMCA model based on Savitzky-Golay $2^{nd}$ derivatives preprocessing was determined as the best classification model in this study. The accuracy, minimum precision, and minimum recall of the best model (PCA models using Savitzky-Golay $2^{nd}$ derivative preprocessed spectra) were evaluated as 73.00%, 98.54% (Korean pine), and 67.50% (Korean pine), respectively.

Distribution and Classification of Indoor Air Pollutants in Public Facilities (다중이용시설에서의 실내공기 중 오염물질 분포현황)

  • 김윤신;엽무종;이철민;박원석;이태형
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2003.05b
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    • pp.310-311
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    • 2003
  • 현대산업이 고도화되고 생활수준이 향상됨에 따라 공기 오염이 심화되고, 건물이 밀폐화되며, 제품이 정밀화됨에 따라 제어해야 할 오염물질이 늘어나고 있으며 급격한 산업발전과 도시화 및 에너지 소비의 급증으로 인하여 대기오염 문제가 날로 심각해지고 있는 실정이다. 도시인이 실내에서 생활하는 시간이 하루 중 90%이상을 차지하고 있으며 실내공기질은 실외와는 달리 실내의 오염원과 실외 오염물질의 유입에 의해 오염될 경우 쉽게 정화되지 않을 뿐만 아니라 재실자들의 건강까지도 위협하고 있다(환경부, 1999). (중략)

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Classification of PM-10 in Indoor Air Using Pattern Recogntion (Pattern Recogntion을 이용한 실내공기 중 PM-10의 분류)

  • 남보현;황인조;김동술
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2000.11a
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    • pp.141-142
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    • 2000
  • 오늘날 경제적 생활환경의 개선으로 인하여 현대인은 24시간 중 80 % 이상을 다양한 실내에서 생활하고 있다. 이에 따라 실내 공기질에 대한 관심이 확대되고 있는 실정이다. 우리나라도 1970년대 이후 실내환경에 대한 공기오염의 보건학적 관심을 보이기 시작했으며 오염원에 대한 기초 조사와 연구가 더욱더 절실한 실정이다. 특히, 실내에서의 오염원 중 담배연기는 보건학적으로 인간의 건강을 위협하는 가장 위협적인 존재이며, 실내 공기질에 가장 큰 영향을 미치는 최악의 오염원이므로 담배 연기에 대한 연구는 매우 중요하다. (중략)

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Urban Climate Mapping - The Case of Sanggye 4-Dong - (도시기후지도의 작성 -상계 4동을 중심으로-)

  • 송영배
    • Journal of the Korean Institute of Landscape Architecture
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    • v.29 no.6
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    • pp.27-36
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    • 2002
  • The objective of this study is to improve the quality of the atmospheric environment by incorporating the factors of meteorology and urban climate into the field of urban and environmental planning. To this end, we have conducted a study on CLIMATOP and the mapping of urban climate, which are basic data used to analyze changes in climatic factors and the stagnation and accumulation of air pollutants. In particular, we focused on understanding the formation and movement of cold fresh air and its influx into urban areas by measuring and analyzing climatic factors. As a study result, classification criteria far CLIMATOP and a urban climatic map were made. In addition, we analyzed a digital elevation model, climatic data, and isothermal curves. As a result, we identified the corridor through which cold fresh air moves. We also observed that the temperature of the fluxed cold fresh air increased as land use changed. When the results of this study are applied to urban re-development and re-building projects, which require preliminary environmental assessment and environmental impact assessment, the practice proposed by this study is expected to contribute to the natural purification of air pollution activating the movement of cold fresh air and its influx into urban areas.

Comparative Morphology of Pollen Grains from Some Korean Gymnosperms (한국산 나자식물 화분의 비교형태)

  • 고성철
    • Journal of Plant Biology
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    • v.37 no.2
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    • pp.203-221
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    • 1994
  • Pollen grains of 19 taxa belonging to 12 genera in 5.families of the Korean gymnosperms were investigated by LM, SEM and TEM, and their morphological characters were described and palynological keys were made for each family. From the taxonomic viewpoint, palynological characters are very available to intergeneric and intrageneric classifications since their distinctive differences in pollen shape, size, condition of surface, sculpture pattern and presence of air bladders and projection except for the intrageneric classification of the genus Pinus since the overlapped characters such as pollen size and sculpture pattern. Pollen grains of Picea koraiensis in the family Pinaceae are distinguished from thc genera Pinus and Abies for the reasons that shape of air bladders are irregular, air bladders are bigger than pollen body, and pollen wall is thin. Compared with the genera Abies and Pinus that have air bladders, Picea koraiensis is closely related to Abies in that pollen body wall become gradually thin from pole of proximal face to air bladder, surface of pollen body is not rough, and pollen size is similar to that of the genus Abies. The presence of ektexine and enexine in proximal face, and the connections of the former to air bladder wall and the latter to distal face were elucidated by the investigation of pollen grains with air bladders through TEM. Endexine of the families of Taxaceae, Taxodiaceae and Cupressaceae was also obse-rved as a pile of laminae. From the observation by SEM, sculpture pattern of air bladder was foveolate with fine pits on surface. Sculpture pattern of air bladder is reticulate under LM, but observed by TEM, it resulted from the transmission of netted structure in air bladder.

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Chip design and application of gas classification function using MLP classification method (MLP분류법을 적용한 가스분류기능의 칩 설계 및 응용)

  • 장으뜸;서용수;정완영
    • Proceedings of the IEEK Conference
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    • 2001.06b
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    • pp.309-312
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    • 2001
  • A primitive gas classification system which can classify limited species of gas was designed and simulated. The 'electronic nose' consists of an array of 4 metal oxide gas sensors with different selectivity patterns, signal collecting unit and a signal pattern recognition and decision Part in PLD(programmable logic device) chip. Sensor array consists of four commercial, tin oxide based, semiconductor type gas sensors. BP(back propagation) neutral networks with MLP(Multilayer Perceptron) structure was designed and implemented on CPLD of fifty thousand gate level chip by VHDL language for processing the input signals from 4 gas sensors and qualification of gases in air. The network contained four input units, one hidden layer with 4 neurons and output with 4 regular neurons. The 'electronic nose' system was successfully classified 4 kinds of industrial gases in computer simulation.

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Comparison of Classification Models for Sequential Flight Test Results (단계별 비행훈련 성패 예측 모형의 성능 비교 연구)

  • Sohn, So-Young;Cho, Yong-Kwan;Choi, Sung-Ok;Kim, Young-Joun
    • Journal of the Ergonomics Society of Korea
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    • v.21 no.1
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    • pp.1-14
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    • 2002
  • The main purpose of this paper is to present selection criteria for ROK Airforce pilot training candidates in order to save costs involved in sequential pilot training. We use classification models such Decision Tree, Logistic Regression and Neural Network based on aptitude test results of 288 ROK Air Force applicants in 1994-1996. Different models are compared in terms of classification accuracy, ROC and Lift-value. Neural network is evaluated as the best model for each sequential flight test result while Logistic regression model outperforms the rest of them for discriminating the last flight test result. Therefore we suggest a pilot selection criterion based on this logistic regression. Overall. we find that the factors such as Attention Sharing, Speed Tracking, Machine Comprehension and Instrument Reading Ability having significant effects on the flight results. We expect that the use of our criteria can increase the effectiveness of flight resources.