• 제어로봇시스템학회논문지
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• 제14권2호
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• pp.178-183
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• 2008

Human motion analysis is researched as a new method for human-robot interaction (HRI) because it concerns with the key techniques of HRI such as motion tracking and pose recognition. To analysis human motion, extracting features of human body from sequential images plays an important role. After finding the silhouette of human body from the sequential images obtained by CCD color camera, the skeleton model is frequently used in order to represent the human motion. In this paper, using the silhouette of human body, we propose the feature extraction method based on hybrid skeleton for detecting human motion. Finally, we show the effectiveness and feasibility of the proposed method through some experiments.

• 펄프종이기술
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• 제45권5호
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• pp.30-36
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• 2013

Hydrophobic property of Kapok fiber was investigated by sequential removal of its components by different extraction methods. Acetone extraction for the removal of the hydrophobic extractives, holo-cel-lulose preparation after the removal of lignin and xylan extraction by potassium hydroxide was applied. The degree of hydrophobicity of each samples were measured by the water sorption ability. The water sorption ability of Kapok fiber was increased by the sequential treatment of acetone extraction, holocellulose preparation and xylan removal. Based on holocellulose compositional analysis by $^1H$-NMR spectroscopic method, the unusual high amount of the acetyl groups in the holocellulose of Kapok partially contributed to the hydrophobicity of Kapok holocellulose fiber.

• 한국환경과학회지
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• 제8권2호
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• pp.197-204
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• 1999

The extent of heavy metal pollution in agricultural in soils near the abandoned mine land site was investigated using their concentrations from the 47 sampling sites in B mine. Samples were prepared using 0.1N HCI - Korean Standard Methods - and then analysed for Cd, Cu, Pb, As and Cr by Inductively Coupled Plasma Spectrometer. In addition, soil and mine tailing samples were sequentially extracted to investigate the chemical speciation of heavy metals in them. The soils in the vicinity of mining area are highly contaminated by heavy metals ranging up to 5.96mg Cd/kg, 253.3mg Cu/kg, 76.7mg Pb/kg, and 15.45 mg As/kg, according to the analysis of Korean Standard Methods. The heavy metal levels by the sequential extraction are much higher than its level by Korean Standard Methods, and little correlated with each other. Based on the results, it is suggested that the As pollution in agricultural soils near the AMLS should be dealt as of prior significance in establishing reclamation strategies for the area.

• ETRI Journal
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• 제33권2호
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• pp.259-266
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• 2011

We present a new method for an automated markerless system to describe, analyze, and classify human gait motion. The automated system consists of three stages: I) detection and extraction of the moving human body and its contour from image sequences, ii) extraction of gait figures by the joint angles and body points, and iii) analysis of motion parameters and feature extraction for classifying human gait. A sequential set of 2D stick figures is used to represent the human gait motion, and the features based on motion parameters are determined from the sequence of extracted gait figures. Then, a k-nearest neighbor classifier is used to classify the gait patterns. In experiments, this provides an alternative estimate of biomechanical parameters on a large population of subjects, suggesting that the estimate of variance by marker-based techniques appeared generous. This is a very effective and well-defined representation method for analyzing the gait motion. As such, the markerless approach confirms uniqueness of the gait as earlier studies and encourages further development along these lines.

• 한국토양비료학회지
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• 제28권3호
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• pp.207-217
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• 1995

토양의 중금속 침출에 사용되고 있는 7종의 단일 침출액간의 침출정도 및 상호관계를 Cd, Zn, Cu 및 Pb별로 구하고 각 중금속의 경시적 변화에 따른 함량 및 형태변화를 조사하기 위하여 아연 광산 주변의 논토양과 아연광산의 영향이 거의 없을 것으로 보이는 농공단지 주변의 논토양에 대하여 단일 침출 및 연속 침출을 수행하였다. 단일 침출액으로는 0.1M HCl, 0.1M $HNO_3$, 1M $NH_4OAc$ (pH 7.0), 0.05M EDTA, 0.001M DTRA (pH 7.3), 0.1M $NH_4Ox$ 및 4M $HNO_3$을 사용하였으며 연속침출은 증류수, 0.5M $KNO_3$, 0.5M NaOH, 0.05M EDTA, 4M $HNO_3$의 순으로 침출을 수행하였다. Cd 및 Zn의 경우 각 침출액간의 상호관계식의 상관관계가 매우 높아 중금속 농도의 상호 추정이 가능하였으나 Cu, Pb는 그렇지 못하였다. 아연 광산 주변 논토양을 대상으로 행한 연속침출 결과, 주 존재 형태는 Cd, Zn, Cu 및 Pb 모두 황화물/잔류태였다. Cd의 경우 치환태, Cu의 경우 유기태, 그리고 Pb의 경우는 탄산염태의 함유율이 상대적으로 높았다. 단 Zn의 경우 황화물/잔류태의 함유율이 79% 이상으로 매우 높았다. 각 중금속의 함량 변화는 12년 동안 모두 뚜렷히 감소 하였으나, 형태별 함유율은 거의 변화지 않았다.

• 한국환경과학회지
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• 제15권3호
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• pp.279-286
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• 2006

Electrokinetic technique was considered in removing arsenic from the abandoned mining tails. In order to estimate the removal characteristics of arsenic, the sequential extraction analysis and desorption experiment were carried out prior to the application of electrokientic process. The result of sequential extraction analysis indicated that the water soluble and exchangeable fraction, easily leachable to ground water, were very low as much as about 2.5% and the fraction except residual (38.3%), possibly extractable under very acidic or alkalic environment, was about 59%. In the result of desorption test using four different kinds of electrolytes, the mixture of citric acid and sodium dodecyl sulfate (SDS) showed the highest desorption efficiency as much as 77.3%. The removal efficiencies of arsenic from mining tailings by electrokinetic process under the different electrolyte environments were slightly low and resulted in the following order: citric acid + SDS (18.6%) > 0.1 $NHNO_3$ (8.1%) > HAc (7.4%) > Distilled water(6.6%). Also, arsenic in soil matrix was moved favorably in the direction of anodic rather than cathodic region, which is opposite trend with cationic metal ions generally existing in soil, because anionic form of arsenic is dominated in acidic soil caused by the movement of acid front form anode.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.487-492
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• 2008

Facial expression recognition is an intensive research area for designing Human Computer Interfaces. In this work, we present a new facial expression recognition system utilizing Enhanced Independent Component Analysis (EICA) for feature extraction and discrete Hidden Markov Model (HMM) for recognition. Our proposed approach for the first time deals with sequential images of emotion-specific facial data analyzed with EICA and recognized with HMM. Performance of our proposed system has been compared to the conventional approaches where Principal and Independent Component Analysis are utilized for feature extraction. Our preliminary results show that our proposed algorithm produces improved recognition rates in comparison to previous works.

• Mass Spectrometry Letters
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• 제15권1호
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• pp.40-48
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• 2024

Capacity of the analytical/quantitative evaluation techniques to satisfy both qualitative and quantitative considerations for effective extraction of marigold oleoresins/xanthophylls and their potential as anti-mycotic and antioxidant activity was assessed. Accelerated solvent extraction (ASE), Soxhlet extraction (SE), Supercritical fluid extraction (SCFE), Cold extraction (CE), and ultrasonically assisted extraction (USE) techniques were evaluated for extraction of oleoresin/xanthophyll content from Tagetes erecta (Var. Pusa Narangi Genda) with respect to solvent consumption, extraction time, reproducibility, and yield. Followed by the antifungal and antioxidant activity evaluation. The overall yield of Tagetes oleoresin was higher in ASE (64.5 g/kg) followed by SE (57.3 g/kg), USE (50.7 g/kg), SCFE (45.3 g/kg) and CE (31.6 g/kg). The lutein esters represented more than 80% of the constituents. Further, xanthophyll/ lutein content in oleoresin was found to be quite higher in HPLC (r2 = 0.996) analysis than in the AOAC recommended UV spectrophotometer analysis. The oleoresin exhibited moderate antioxidant activity (DPPH assay) and antifungal activity against three phytopathogenic fungi. Based on the various parameters, the reproducibility of ASE was better (0.3-8.0%) than that of SE (0.5-12.9%), SCFE (0.2-9.4%), USE (0.3-12.4%) and CE (0.8-15.3%). ASE with (RSD 1.6%) is preferred being faster, reproducible, uses less solvent, robust and automation allows sequential extraction of the sample in less time.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권5호
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• pp.16-22
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• 2010

Heavy metals in soils exist in various forms dependent upon surrounding conditions. As the Janghang smelter area is of concern for its high elevated heavy metal concentrations, Korean government decided to remediate the area. Main objectives of this research were; to analyze heavy metal concentrations and their existing forms in the vicinity of the smelter; and to understand differences made by analysis techniques of heavy metals. Top soils of rice field, crop field, bare field, and forestry in the area were sampled and analyzed for their physicochemical characteristics. Concentrations of Cu, Cd, Pb, and As were analyzed with two pretreatment techniques adopted using 0.1 N HCl and aqua regia. To analyze existing forms of heavy metals, Tessier's schemes for sequential extraction technique were adopted. Exchangeable fraction and carbonate bound fraction of heavy metals may pose potential threat to environment and were in the order of Pb > As > Cu > Cd. If assessing mobile fraction of heavy metals by land uses, the order was forestry > bare land > crop field > rice field. When analyzed using Tessier's scheme, high ratio of residual fractions to total arsenic concentration should be considered for remediation design of the area.

• 한국해양학회지:바다
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• 제4권1호
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• pp.25-32
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• 1999

발전소 가동에 따른 퇴적물내 중금속원소의 오염 가능성을 알아보기 위하여 삼천포화력발전소와 영광원자력 발전소 주변해역의 표층퇴적물을 대상으로 중금속 함량 분석을 실시하였으며 선정된 일부 퇴적물에 대해서는 화학적 존재형태를 파악하기 위해 연속추출분석을 실시하였다. 퇴적불 중의 금속원소 함량 분포는 대체적으로 평균입도에 의해 조절되고 있으며 탄산염 함량 및 유기불 함량에 의해서도 영향을 받고 있는 것으로 나타났다. 또한 화학적 존재형태별 분석에서도 Mn을 제외한 대부분의 중금속이 잔류상으로 존재하고 있어 인위적인 오염에 의해서라기 보다는 자연적인 분산에 의해 존재하고 있는 것으로 나타났다.