• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권10호
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• pp.5120-5142
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• 2018

Social media enables customers to share their views, opinions and experiences as product reviews. These product reviews facilitate customers in buying quality products. Due to the significance of online reviews, fake reviews, commonly known as spam reviews are generated to mislead the potential customers in decision-making. To cater this issue, review spam detection has become an active research area. Existing studies carried out for review spam detection have exploited feature engineering approach; however limited number of features are considered. This paper proposes a Feature-Centric Model for Review Spam Detection (FMRSD) to detect spam reviews. The proposed model examines a wide range of feature sets including ratings, sentiments, content, and users. The experimentation reveals that the proposed technique outperforms the baseline and provides better results.

• 대한임베디드공학회논문지
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• 제11권5호
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• pp.277-285
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• 2016

Moving object detection system has been an emerging research field in various advanced driver assistance systems (ADAS) and surveillance system. In this paper, we propose two optical flow based moving object detection methods at dynamic scenes. Both proposed methods consist of three successive steps; pre-processing, foreground segmentation, and post-processing steps. Two proposed methods have the same pre-processing and post-processing steps, but different foreground segmentation step. Pre-processing calculates mainly optical flow map of which each pixel has the amplitude of motion vector. Dense optical flows are estimated by using Farneback technique, and the amplitude of the motion normalized into the range from 0 to 255 is assigned to each pixel of optical flow map. In the foreground segmentation step, moving object and background are classified by using the optical flow map. Here, we proposed two algorithms. One is Gaussian mixture model (GMM) based background subtraction, which is applied on optical map. Another is adaptive thresholding based foreground segmentation, which classifies each pixel into object and background by updating threshold value column by column. Through the simulations, we show that both optical flow based methods can achieve good enough object detection performances in dynamic scenes.

• Nuclear Engineering and Technology
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• 제52권2호
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• pp.456-460
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• 2020

In this research, a radiation detection backpack to be used discreetly or by a wide range of users was developed using array silicon-photomultiplier (SiPM) and CsI (Tl), and its characteristics were evaluated. The R-squared value, which indicates the responsiveness of a detector based on the signal intensity, was determined to be 0.981, indicating a good linear responsivity. The energy resolutions for gamma radiation energies of Co-57 (122 keV), Ba-133 (356 keV), Cs-137 (662 keV), and Co-60 (1332 keV) were found to be 13.40, 10.50, 6.77, and 3.16%, respectively. These results confirm good energy resolution characteristics. Furthermore, in the case of mixed sources, the gamma radiation peaks were readily distinguishable, and the R-squared value for energy linearity was calculated to be 0.999, demonstrating an exceptional energy linearity. Further research based on the results of this study would enable the commercialization of lightweight SiPM-based wireless radiation detection backpacks that can be used for longer durations by replacing the photomultiplier tube, which is mainly used as the optical sensor in existing radiation detection backpacks.

• 한국작물학회지
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• 제50권spc1호
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• pp.228-230
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• 2005

형광 염료와 레이저 겔스캐너 장비를 이용하여 변성아크릴 아마이드 겔에서 전기 영동된 DNA를 신속하고 간편한 방법으로 기존의 은염색법과 비슷한 감도로 검출하고자 하였다. 변성아크릴아마이드 겔을 형광 염료인 SYBR Green (Molecular Probes)이나 Vistra Green (Amersham Bioscience) 0.01 X 희석액 (pH 8)으로 염색한 후 480nm 레이져, 520nm filer 옵션으로 스캔하여 DNA를 검출하였으며, 검출감도는 기존의 은염색법과 비슷하면서 염색 단계를 한 단계로 줄일 수 있었다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권7호
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• pp.3423-3426
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• 2012

Background: The objective of this study was to measure the antibody content of NuTu-19 ovarian cancer cells in serum samples using a quartz crystal microbalance (QCM) immunosensor. Materials and Methods: NuTu-19 cells were first cultured onto the electrode surfaces of crystals in Dulbecco's modified Eagle medium, and then specified amounts of immunized serum samples of immunized rabbit were also added. The change in mass caused by specific adsorbtion of antibodies of NuTu-19 to the surfaces of the crystals was detected. Results: The change in resonance frequency of crystals caused by immobilization of NuTu-19 cells was from 83 to 429Hz. The antibody content of NuTu-19 detected was 341ng/ul. The frequency shifts were linearly dependent on the amount of antibody mass in the range of 69 to 340ng. The positive detection rate and the negative detection rate were 80% and 100%, respectively. Conclusion: This immunoassay provides a viable alternative to other early ovarian cancer detection methods and is particularly suited for health screening of the general population.

• 방송공학회논문지
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• 제25권4호
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• pp.576-586
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• 2020

레이더나 라이더 센서를 활용한 야구 경기 분석은 많은 비용이 요구된다. 본 논문에서는 중계 비디오에서 피치 샷과 타구 샷을 검출하고, 카메라의 움직임 기반 타구 궤적 생성 알고리즘을 제안한다. 제안하는 알고리즘은 객체 검출과 옵티컬 플로우 기반 피치 샷과 타구 샷 검출 이후, 프레임 간 변환 관계를 통해 프레임 내 타구 위치와 타구 궤적을 계산한다. 제안 방법은 KBO 중계 영상 시퀀스 3개에 대해 성능을 평가하였고 피치 샷과 타구 샷 검출 정확도와 검출률은 89-95[%] 이내의 성능을 보였으며, 평균 타구 위치 거리차이는 13.6[m], 방향 차이 7.5°, 파울 분류 정확도 98.6%의 성능을 보였다.

• 한국군사과학기술학회지
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• 제8권4호
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• pp.110-119
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• 2005

In this paper, a new detection algorithm was proposed for finding the position of lenslet array spot pattern used to acquire laser wavefront. Based on the analysis of the required signal processing characteristics, we categorized into and designed four main signal processing functions. The proposed was designed in order to have robust feature against a variation of geometrical form of the spot and also implemented to have semi-automatic thresholding capability based on CCD noise analysis. For performance evaluation, we made qualitative and quantitative comparisons with Carvalho's algorithm which has been published in recent. In the given experimental spot images, the proposed could detect the spots which has 1/3 times lower than the least S/N of which Carvalho's can detect and could reach to a detection precision of 0.1 pixel at the S/N. In functional aspect, the proposed could separate all valid spots locally. From these results, the proposed could have a superior precision of location detection of spot pattern in wider S/N range.

• Journal of Microbiology and Biotechnology
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• 제14권2호
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• pp.385-389
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• 2004

The antibody-mix sandwich enzyme-linked immunosorbent assay (Ab-mix sELlS A) system was developed in order to simultaneously detect the extracellular polysaccharide (FPS) of Aspergillus, Penicillium, or Fusarium species using one detection system. The detection limit and detection range of the Ab-mix sELISA towards EPS of Penicilliun citrinum were not changed, and those towards Fusarium moniliforme EPS were changed a little compared to that of individual sandwich ELISA [9, 10]. The fungal culture filtrates of Aspergillus and Penicillium species showed nearly similar reactivity towards Ab-mix sELISA as that of sELISA using the MAb lB8 alone [9]. Also, the fungal culture filtrates of Fusarium species showed nearly the same reactivity towards Ab-mix sELISA as that of sELISA using the MAb lB8 alone [10]. Thus, this ELISA system showed that the three genera of molds, Aspergillus, Penicillium, or Fusarium, which are three major important molds producing mycotoxins in food or agricultural commodities, could be detected at the same time, using one detection system.

• Bulletin of the Korean Chemical Society
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• 제31권11호
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• pp.3077-3083
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• 2010

The electrochemical detection of As(III) was investigated on a platinum-iron(III) nanoparticles modified multiwalled carbon nanotube on glassy carbon electrode(nanoPt-Fe(III)/MWCNT/GCE) in 0.1 M $H_2SO_4$. The nanoPt-Fe(III)/MWCNT/GCE was prepared via continuous potential cycling in the range from -0.8 to 0.7 V (vs. Ag/AgCl), in 0.1 M KCl solution containing 0.9 mM $K_2PtCl_6$ and 0.6 mM $FeCl_3$. The Pt nanoparticles and iron oxide were co-electrodeposited into the MWCNT-Nafion composite film on GCE. The resulting electrode was examined by cyclic voltammetry (CV), scanning electron microscopy (SEM), and anodic stripping voltammetry (ASV). For the detection of As(III), the nanoPt-Fe(III)/MWCNT/GCE showed low detection limit of 10 nM (0.75 ppb) and high sensitivity of $4.76\;{\mu}A{\mu}M^{-1}$, while the World Health Organization's guideline value of arsenic for drinking water is 10 ppb. It is worth to note that the electrode presents no interference from copper ion, which is the most serious interfering species in arsenic detection.

• 대한전자공학회논문지SP
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• 제46권6호
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• pp.88-94
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• 2009

본 논문에서는 보안 및 감시 시스템 분야에 적용할 수 있는 실시간 객체 탐지 및 추적 알고리듬을 제안한다. 구현된 시스템은 객체 탐지 단계, 객체 추적 단계로 구성되었다. 객체탐지에서는 정화한 객체의 움직임 검출을 위한 향상된 검출 방법인 적응배경 차분법과 적응적 블록 기반 모델을 제안한다. 객체추적에서는 칼만 필터에 기반한 다중 물체 추적 시스템을 설계하였다. 실험결과 이동객체의 움직임을 추정할 수 있었고, 추적 과정에서도 다수의 객체를 잃어버리지 않고 정상적으로 추적할 수 있었다. 또한 원거리 탐지 및 추적에서 향상된 결과를 얻을 수 있었다.