• Title/Summary/Keyword: Marker-based AR

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Quantitative Determination of Marker Compounds and Pattern Recognition Analysis for Quality Control of Alismatis Rhizoma by HPLC

  • Na, Braham;Men, Chu Van;Kim, Kyung Tae;Lee, Min Jung;Lee, Eunsil;Jin, Hong-Guang;Woo, Eun Ran;Woo, Mi Hee;Kang, Jong Seong
    • Bulletin of the Korean Chemical Society
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    • v.34 no.7
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    • pp.2081-2085
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    • 2013
  • A quantitative method for determining levels of three bioactive compounds based on pattern recognition was developed and fully validated for the quality control of Alismatis Rhizoma (AR) by HPLC. Separation conditions were optimised using an Optimapak $C_{18}$ column ($250mm{\times}4.6mm$, 5 ${\mu}m$) with a mobile phase of acetonitrile and 0.1% aqueous phosphoric acid and detection wavelengths of 205 and 245 nm. Method validation yielded acceptable linearity ($r^2$ > 0.9998) and percent recovery (98.06%-101.71%). Limits of detection ranged from 0.08 to 0.15 ${\mu}g/mL$. Levels of the three bioactive compounds, alisol C acetate, alisol B, and alisol B acetate, in AR were 0.07-0.45, 0.38-10.32, and 1.13-8.59 mg/g dried weight, respectively. Pattern analyses based on these three compounds were able to differentiate Chinese and Korean samples accurately. The results demonstrate that alisol B and its acetate may be used as marker compounds for AR quality and can be regulated to no less than 0.36 and 1.29 mg/g of dried sample, respectively. The method described here is suitable for quantitative analyses and quality control of multiple components in AR.

Development of Pre-construction Verification System using AR-based Drawings Object (도면증강 객체기반의 건설공사 사전 시공검증시스템 개발 연구)

  • Kim, Hyeonsung;Kang, Leenseok
    • Land and Housing Review
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    • v.11 no.3
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    • pp.93-101
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    • 2020
  • Recently, as a BIM-based construction simulation system, 4D CAD tools using virtual reality (VR) objects are being applied in construction project. In such a system, since the expression of the object is based on VR image, it has a sense of separation from the real environment, thus limiting the use of field engineers. For this reason, there are increasing cases of applying augmented reality (AR) technology to reduce the sense of separation from the field and express realistic VR objects. This study attempts to develop a methodology and BIM module for the pre-construction verification system using AR technology to increase the practical utility of VR-based BIM objects. To this end, authors develop an AR-based drawing verification function and drawing object-based 4D model augmentation function that can increase the practical utility of 2D drawings, and verify the applicability of the system by performing case analysis. Since VR object-based image has a problem of low realism to field engineers, the linking technology between AR object and 4D model is expected to contribute to the expansion of the use of 4D CADsystem in the construction project.

Augmented Visualization of Modeling & Simulation Analysis Results (모델링 & 시뮬레이션 해석 결과 증강가시화)

  • Kim, Minseok;Seo, Dong Woo;Lee, Jae Yeol;Kim, Jae Sung
    • Korean Journal of Computational Design and Engineering
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    • v.22 no.2
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    • pp.202-214
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    • 2017
  • The augmented visualization of analysis results can play an import role as a post-processing tool for the modeling & simulation (M&S) technology. In particular, it is essential to develop such an M&S tool which can run on various multi-devices. This paper presents an augmented reality (AR) approach to visualizing and interacting with M&S post-processing results through mobile devices. The proposed approach imports M&S data, extracts analysis information, and converts the extracted information into the one used for AR-based visualization. Finally, the result can be displayed on the mobile device through an AR marker tracking and a shader-based realistic rendering. In particular, the proposed method can superimpose AR-based realistic scenes onto physical objects such as 3D printing-based physical prototypes in a seamless manner, which can provide more immersive visualization and natural interaction of M&S results than conventional VR or AR-based approaches. A user study has been performed to analyze the qualitative usability. Implementation results will also be given to show the advantage and effectiveness of the proposed approach.

Implementation of Contents System using Color Marker in Mobile AR (모바일 증강현실에서 컬러마커를 이용한 콘텐츠시스템 구현)

  • Lee, Jong-Keun;Jo, Sung-Hyun;Lee, Jong-Hyeok
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.05a
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    • pp.494-497
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    • 2012
  • Black marker cause unnatural problems between the existing various contents and marker. To solve this problem, we tested the various colors and color placement according to frequency of 3D objects. Based on this, infant's learning content system based NyARToolkit for the mobile-based augmented reality was implemented. We are solved the unnatural problems by insert to color marker in the Implemented system. and infant can study seamlessly because concentration increases by the familiar character on the markers.

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Identification of Marker Nucleotides for the Molecular Authentication of Araliae Continentalis Radix Based on the Analysis of Universal DNA Barcode, matK and rbcL, Sequences (범용성 DNA 바코드(matK, rbcL) 분석을 통한 독활(獨活) 유전자 감별용 Marker Nucleotide 발굴)

  • Kim, Wook Jin;Yang, Sungyu;Choi, Goya;Moon, Byeong Cheol
    • The Korea Journal of Herbology
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    • v.31 no.5
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    • pp.15-23
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    • 2016
  • Objectives : Araliae Continentalis Radix and Angelicae Pubescentis Radix have been used as the same medicinal name Korean and Chinese traditional medicines, respectively. The authentic Araliae Continentalis Radix is described only the root of Aralia continentalis in the Korean Pharmarcopoeia. However, the dried root of Angelica biserrata, Levisticum officinale, or Heracleum moellendorffii also has been distributed adulterants of Araliae Continentalis Radix. To develop a reliable method for identifying Araliae Continentalis Radix from adulterants, we carried out the analyses of universal DNA barcode sequences.Methods : Four plants species were collected from different habitate and nucleotide sequences of matK and rbcL were analyzed. The species-specific sequences and phylogenetic relationship were estimated using entire sequences of two DNA barcodes, respectively.Results : In comparative analysis of matK sequences, we were identified 104 positions of marker nucleotide for Ar. continentalis, 3 for An. biserrata, 4 for L. officinale and 8 for H. moellendorffii enough to distinguish individual species, respectively. Furthermore, we obtained marker nucleotides in rbcL at 42 positions for Ar. continentalis, 5 for An. biserrata and 2 for H. moellendorffii, but not for L. officinale. The phylogenetic tree of matK and rbcL were showed that all samples were clustered into four groups constituting homogeneous clades within the species.Conclusions : We confirmed that species-specific marker nucleotides of matK sequence provides distinct genetic information enough to identify four species. Therefore, we suggest that matK gene is useful DNA barcode for discriminating authentic Araliae Continentalis Radix from inauthentic adulterants.

A Sketch-based 3D Object Retrieval Approach for Augmented Reality Models Using Deep Learning

  • Ji, Myunggeun;Chun, Junchul
    • Journal of Internet Computing and Services
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    • v.21 no.1
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    • pp.33-43
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    • 2020
  • Retrieving a 3D model from a 3D database and augmenting the retrieved model in the Augmented Reality system simultaneously became an issue in developing the plausible AR environments in a convenient fashion. It is considered that the sketch-based 3D object retrieval is an intuitive way for searching 3D objects based on human-drawn sketches as query. In this paper, we propose a novel deep learning based approach of retrieving a sketch-based 3D object as for an Augmented Reality Model. For this work, we introduce a new method which uses Sketch CNN, Wasserstein CNN and Wasserstein center loss for retrieving a sketch-based 3D object. Especially, Wasserstein center loss is used for learning the center of each object category and reducing the Wasserstein distance between center and features of the same category. The proposed 3D object retrieval and augmentation consist of three major steps as follows. Firstly, Wasserstein CNN extracts 2D images taken from various directions of 3D object using CNN, and extracts features of 3D data by computing the Wasserstein barycenters of features of each image. Secondly, the features of the sketch are extracted using a separate Sketch CNN. Finally, we adopt sketch-based object matching method to localize the natural marker of the images to register a 3D virtual object in AR system. Using the detected marker, the retrieved 3D virtual object is augmented in AR system automatically. By the experiments, we prove that the proposed method is efficiency for retrieving and augmenting objects.

A Real-time Vision-based Page Recognition and Markerless Tracking in DigilogBook (디지로그북에서의 비전 기반 실시간 페이지 인식 및 마커리스 추적 방법)

  • Kim, Ki-Young;Woo, Woon-Tack
    • 한국HCI학회:학술대회논문집
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    • 2009.02a
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    • pp.493-496
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    • 2009
  • Many AR (Augmented Reality) applications have been interested in a marker-less tracking since the tracking methods give camera poses without attaching explicit markers. In this paper, we propose a new marker-less page recognition and tracking algorithm for an AR book application such as DigilogBook. The proposed method only requires orthogonal images of pages, which need not to be trained for a long time, and the algorithm works in real-time. The page recognition is done in two steps by using SIFT (Scale Invariant Feature Transform) descriptors and the comparison evaluation function. And also, the method provides real-time tracking with 25fps ~ 30fps by separating the page recognition and the frame-to-frame matching into two multi-cores. The proposed algorithm will be extended to various AR applications that require multiple objects tracking.

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Development of simple HPLC-UV method for discrimination of Adenophorae Radix

  • Vu, Thi Phuong Duyen;Kim, Kyung Tae;Pham, Yen;Bao, Haiying;Kang, Jong Seong
    • Analytical Science and Technology
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    • v.30 no.2
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    • pp.82-88
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    • 2017
  • Adenophorae Radix (AR) is a frequently used medicinal herb; because of its popularity, products containing similar herbal products are often sold as substitutes, especially if their morphology is similar. However, any analytical method to identify AR based on quantitative analysis is not registered in Korea, Japan and China Pharmacopoeias. This study developed a simple HPLC method to discriminate between authentic AR and substitutes. Linoleic acid was used as a marker compound of AR. Our optimized HPLC-UV conditions included a mobile phase of 90 % acetonitrile under isocratic condition, and a flow rate of 1.0 mL/min at room temperature. Detection wavelength was set at 205 nm. Linoleic acid was detected at 13.5 minutes for a total analysis time of 20 minutes. The standard herb of AR contained 0.025 % of linoleic acid, while four authentic AR samples and eight substitutes contained 0.040~0.071 % and 0.004~0.014 %, respectively. Comparison of the linoleic acid concentrations of the sample types to reference AR showed that among 12 samples, only the four samples were authentic. Thus, our HPLC-UV method, along with our suggested content criterion for linoleic acid concentration, can be used for the quick and accurate determination whether the herbal products are authentic AR or substitute.

An Image-based Augmented Reality System for Multiple Users using Multiple Markers (다수 마커를 활용한 영상 기반 다중 사용자 증강현실 시스템)

  • Moon, Ji won;Park, Dong woo;Jung, Hyun suk;Kim, Young hun;Hwang, Sung Soo
    • Journal of Korea Multimedia Society
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    • v.21 no.10
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    • pp.1162-1170
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    • 2018
  • This paper presents an augmented reality system for multiple users. The proposed system performs ar image-based pose estimation of users and pose of each user is shared with other uses via a network server. For camera-based pose estimation, we install multiple markers in a pre-determined space and select the marker with the best appearance. The marker is detected by corner point detection and for robust pose estimation. the marker's corner points are tracked by optical flow tracking algorithm. Experimental results show that the proposed system successfully provides an augmented reality application to multiple users even when users are rapidly moving and some of markers are occluded by users.

Development of App Contents for Information Realistic Experience based on AR (증강현실 기반의 인포메이션 실감체험을 위한 앱 콘텐츠 개발)

  • Moon, Hee Jeoung
    • Journal of Korea Multimedia Society
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    • v.23 no.11
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    • pp.1428-1434
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    • 2020
  • Virtual reality (VR) and augmented reality (AR) technologies can interact intuitively using virtual 3D images. Information signs on buildings that are frequently used by the public play a very important role in conveying information. However, the current information sign has different understanding and interpretation, and it is difficult to communicate quickly and intuitively for interaction. The purpose of this study is to increase the efficiency of information signing through information provision using mobile augmented reality. The InfoAR app not only guides you to the destination of the building, but also acts as a marker for the logo image. The logo image created based on the feature points recognizes the information of the destination. It is converted to AR through a mobile app, allowing users to easily find their destination by obtaining specific information. In addition, it presents interactions that can enlarge, reduce, move, and rotate information about virtual objects augmented through a function called AR. In the future, if user convenience and usability of the interface are added, research is conducted, and the level of completion is improved, such as using VR contents and promotions and business cards, it is expected that highly useful contents will be produced.