• Title/Summary/Keyword: infrared image

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Colloidal synthesis of IR-Iuminescent HgTe quantum dots (콜로이드 합성법에 의한 HgTe 양자점의 제조와 특성 분석)

  • Song, Hyun-Woo;Cho, Kyoung-Ah;Kim, Hyun-Suk;Kim, Sang-Sig
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.31-34
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    • 2002
  • HgTe quantum dots were synthesized in aqueous solution at room temperature by colloidal method. The synthesized materials were identified to be zincblende cubic structured HgTe quantum dots by X-ray diffraction and transmission electron microscopy image revealed that these quantum dots are agglomerate of a individual particle. The colloidally prepared HgTe quantum dots have the sphere-like shape with a diameter of approximately 4 nm. The optical properties of the HgTe quantum dots were investigated with photoluminescence(PL). The PL appears in the near-infrared region, which represent a dramatic shift from bulk HgTe behavior. The analytic results revealed that HgTe quantum dots have the broad size distribution, as PL emission spectrum covers the spectral region from 900 to 1400 nm. In this study, the factors affecting PL of HgTe quantum dots and particle size distributiont are described.會Ā᐀䁇?⨀젲岒Ā㰀會Ā㰀顇?⨀끩Ā㈀會Ā㈀?⨀䡪ఀĀ᐀會Ā᐀䡈?⨀Ā᐀會Ā᐀ꁈ?⨀硫ᜀĀ저會Ā저?⨀샟ගऀĀ저會Ā저偉?⨀栰岒ఀĀ저會Ā저ꡉ?⨀1岒Ā저會Ā저J?⨀惝ග؀Ā؀會Ā؀塊?⨀ග嘀Ā切會Ā切끊?⨀⣟ගĀ搀會Ā搀ࡋ?⨀큭킢Ā저會Ā저恋?⨀桮킢Ā저會Ā저롋?⨀⣅沥ࠀĀࠀ會Āࠀ၌?⨀샅沥Ā저會Ā저桌?⨀壆沥ሀĀ저會Ā저쁌?⨀o킢瀀ꀏ會Āᡍ?⨀棤좗ĀĀĀ會ĀĀ灍?⨀å좗ĀĀĀ會ĀĀ졍?⨀飥좗ĀĀĀ會ĀĀ⁎?⨀?ꆟᤀ

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Assessment of the Optic-guided Patient Positioning for Spinal Stereotactic Radiosurgery Using Novalis ExacTrac System (노발리스 ExacTrac system을 이용한 척추 정위 방사선수술 방법 평가)

  • 이동준;손문준;최광영;이기택;최찬영;황금철;황충진
    • Progress in Medical Physics
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    • v.13 no.4
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    • pp.218-223
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    • 2002
  • Stereotactic radiosurgery for intracranial lesion is well established since the Lars Leksell first introduced radiosurgery concept in 1951 Its use in the treatment of spinal lesion has been limited by the availability of effective immobilization devices. The first clinical experience of the spinal stereotactic radiosurgery technique was reported by Hamilton AJ. in 1995. Recently, Optic-guided patient positioning technique for extracranial stereotactic radiosurgery was developed and reported. This study is for assess the target positioning accuracy of the optic guided patient positioning system Exactrac (BrainLab., Inc, Germany). We have designed phantom for assess the accuracy of spinal stereotactic radiosurgery The infrared reflective body markers attached to the relatively immobile part of the body and a series of 2 mm CT images was taken. The image sets were transferred to the planning computer. During the radiosurgery treatment, we measure the real-time display showing the positioning values from Exactrac computer. And we compare the isocenter deviation from irradiated center point of the film which was mounted on the lesion site of the phantom and pin hole site of that film. The accuracy of the ExacTrac system in positioning a target point shows enough for the clinical applications.

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Relation between Thermal Emissivities and Alignment Degrees of Graphite Flakes Coated on an Aluminum Substrate (알루미늄 기판에 코팅된 흑연입자의 배향도 변화와 열방사율 변화의 관계)

  • Kang, Dong Su;Lee, Sang Min;Kim, Suk Hwan;Lee, Sang Woo;Roh, Jae Seung
    • Korean Journal of Materials Research
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    • v.24 no.3
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    • pp.159-165
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    • 2014
  • This study is research on the thermal emissivity depending on the alignment degrees of graphite flakes. Samples were manufactured by a slurry of natural graphite flakes with organic binder and subsequent dip-coating on an aluminum substrate. The alignment degrees were controlled by applying magnetic field strength (0, 1, and 3 kG) to the coated samples. The alignment degree of the sample was measured by XRD. The thermal emissivity was measured by an infrared thermal image camera at $100^{\circ}C$. The alignment degrees were 0.04, 0.11, and 0.17 and the applied magnetic field strengths were 0, 1, and 3 kG, respectively. The thermal emissivities were 0.829, 0.837, and 0.844 and the applying magnetic field strengths were 0, 1, and 3 kG, respectively. In this study the correlation coefficient, $R^2$, between thermal emissivity and alignment degree was 0.997. Therefore, it was concluded that the thermal emissivities are correlated with the alignment degree of the graphite flakes.

Comparison of the Diagnostic Validity of Real and Absolute Skin Temperature Differences for Complex Regional Pain Syndrome (복합부위통증증후군 진단 시 좌우 체온 차이의 실제값과 절대값의 진단적 타당도 비교)

  • Nahm, Francis Sahngun;Lee, Pyung Bok;Park, Soo Young;Kim, Yong Chul;Lee, Sang Chul
    • The Korean Journal of Pain
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    • v.22 no.2
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    • pp.146-150
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    • 2009
  • Background: A skin temperature difference is one of the variables used in the diagnosis of complex regional pain syndrome. However, there have been no reports as to whether the real (${\Delta}T$) or absolute value ($|{\Delta}T|$) of skin temperature differences should be used in the diagnosis of complex regional pain syndrome. This study was conducted to compare the diagnostic validity of ${\Delta}T$ with $|{\Delta}T|$ for complex regional pain syndrome using receiver operating characteristic curves (ROC). Methods: Infrared thermographic images were obtained from the 144 patients who were suspected to have CRPS in a unilateral limb. After ${\Delta}T$ and $|{\Delta}T|$ calculation from the thermographic image, ROCs of ${\Delta}T$ and $|{\Delta}T|$ were developed, and the areas under the curve (AUC) for the ROC curves were compared. Results: AUCs of ${\Delta}T$ and $|{\Delta}T|$ were 0.520 and 0.746 respectively, this difference was statistically significant (P < 0.001). Conclusions: Absolute skin temperature difference shows greater validity in the diagnosis of CRPS than ${\Delta}T$. Therefore, $|{\Delta}T|$ is more useful when comparing the skin temperature of CRPS patients.

The design of 4s-van for GIS DB construction (GIS DB 구축을 위한 4S-VAN 설계)

  • Lee, Seung-Yong;Kim, Seong-Baek;Lee, Jong-Hun
    • Journal of Korean Society for Geospatial Information Science
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    • v.10 no.3 s.21
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    • pp.89-97
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    • 2002
  • We have developed the 45-Van system in order to maximize the interoperability of spatial data in 45(GNSS, SIIS, GIS, ITS) by sharing and providing spatial data of remote site. The 4S-Van system enables to acquisition and production of information for GIS database and the accurate position information by combining and connecting GPS/IMU, laser, CCD(charged-coupled device) image, and wireless telecommunication technology. That is, 4S-Van system measures its position and attitude using integrated GPS/IMU and takes two photographs of the front scene by two CCD cameras, analyzes position of objects by space intersection method, and constructs database that has compatibility with existing vector database system. Furthermore, infrared camera and wireless communication technique can be applied to the 4S-Van for a variety of applications. In this paper, we discuss the design and functions of 4S-Van that is equipped with GPS, CCD camera, and IMU.

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Infrared Gait Recognition using Wavelet Transform and Linear Discriminant Analysis (웨이블릿 변환과 선형 판별 분석법을 이용한 적외선 걸음걸이 인식)

  • Kim, SaMun;Lee, DaeJong;Chun, MyungGeun
    • Journal of the Korean Institute of Intelligent Systems
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    • v.24 no.6
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    • pp.622-627
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    • 2014
  • This paper proposes a new method which improves recognition rate on the gait recognition system using wavelet transform, linear discriminant analysis and genetic algorithm. We use wavelet transform to obtain the four sub-bands from the gait energy image. In order to extract feature data from sub-bands, we use linear discriminant analysis. Distance values between training data and four sub-band data are calculated and four weights which are calculated by genetic algorithm is assigned at each sub-band distance. Based on a new fusion distance value, we conducted recognition experiments using k-nearest neighbors algorithm. Experimental results show that the proposed weight fusion method has higher recognition rate than conventional method.

A New Ergonomic Interface System for the Disabled Person (장애인을 위한 새로운 감성 인터페이스 연구)

  • Heo, Hwan;Lee, Ji-Woo;Lee, Won-Oh;Lee, Eui-Chul;Park, Kang-Ryoung
    • Journal of the Ergonomics Society of Korea
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    • v.30 no.1
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    • pp.229-235
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    • 2011
  • Objective: Making a new ergonomic interface system based on camera vision system, which helps the handicapped in home environment. Background: Enabling the handicapped to manipulate the consumer electronics by the proposed interface system. Method: A wearable device for capturing the eye image using a near-infrared(NIR) camera and illuminators is proposed for tracking eye gaze position(Heo et al., 2011). A frontal viewing camera is attached to the wearable device, which can recognize the consumer electronics to be controlled(Heo et al., 2011). And the amount of user's eye fatigue can be measured based on eye blink rate, and in case that the user's fatigue exceeds in the predetermined level, the proposed system can automatically change the mode of gaze based interface into that of manual selection. Results: The experimental results showed that the gaze estimation error of the proposed method was 1.98 degrees with the successful recognition of the object by the frontal viewing camera(Heo et al., 2011). Conclusion: We made a new ergonomic interface system based on gaze tracking and object recognition Application: The proposed system can be used for helping the handicapped in home environment.

Treatment of CRPS Type-I with Fire and Water Acupoints: A Case Report (오수혈의 화(火)혈과 수(水)혈의 운용을 통한 CRPS 제1형 환자 치험 1례)

  • Kim, Jong Han;Yoo, Je Hyuk;Park, Ji Min;Lee, Seung Min;Im, Se Hoon;Lee, Sang Hoon;Lee, Jae Dong;Nam, Dong Woo
    • Journal of Acupuncture Research
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    • v.30 no.3
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    • pp.165-171
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    • 2013
  • Objectives : The purpose of this study is to investigate the effect of acupuncture treatment on a patient suffering from CRPS Type 1. Methods : A 30-year-old female patient suffering from CRPS Type 1 with symptoms of intense burning pain, joint stiffness, restricted mobility, rapid hair and nail growth, allodynia, hyperalgesia and coldness of the right leg was treated with acupuncture on six acupuncture points on the leg from 13 July to 18 July of 2011. Improvement of the patient's symptoms was evaluated by Numerical Rating Scale(NRS), Digital Infrared Thermographic Image(DITI). Results : After 6 days of treatment, NRS score decreased significantly and the DITI results showed moderate improvement in temperature. Conclusions : The results suggest that acupuncture may be an effective in reducing the symptoms of CRPS. Further study is needed to evaluate the significancy of this report.

Synthesis and Characterization of Molybdenum (V)-1, 6-Diaminohexane-N, N, N', N'-tetraacetic Acid Derivatives Complexes (몰리브덴 (V) 와 1, 6-Diaminohexane-N, N, N', N'-tetraacetic Acid 계 착물합성과 그 성질)

  • Sang Oh Oh;Sig Young Choi
    • Journal of the Korean Chemical Society
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    • v.33 no.1
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    • pp.90-96
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    • 1989
  • A new series of $dioxo-di-{\mu}-oxo-dimolybdate(V)(*image)$, has been prepared by the reaction of pyridinum oxoisothiocyanato-molybdate(V) with 1, 6-diaminohexane-N, N, N', N'-tetraacetic acid derivatives containing amine carboxyl groups. The properties and possible molecular structure of these complexes were discussed by elemental analysis, spectroscopic studies and magnetic susceptibility measurements. The infrared spectra of these complexes show two strong Mo=$O_t$ stretching modes in the $900-965cm^{-1}$, MoO$_2$Mo stretching bands at around 450∼500 and $740-765 cm^{-1}$ to symmetrical and asymmetrical O-bridge stretching, a coordinated $COO^-$ asymmetrical band in the $1600-1635 cm^{-1}$. The complexes synthesized were yellow or orange and diamagnetic.

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Aanalysis the Structure of Heat Environment in Daegu Using Landsat-8 (Landsat-8을 활용한 대구시 열 환경구조 분석)

  • Kim, Jun Hyun;Choi, Jin Ho
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.32 no.4_1
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    • pp.327-333
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    • 2014
  • To improve thermal environments in urban area, the structural characteristic analysis of thermal environments of the certain area should be preceded to analyze and supplement its problems. With Landsat-8, we measured the centrality estimation, the distribution map, and the spatial statistical analysis of Daegu Metropolitan City in January and August, which of data applied in analyzing the structure of thermal environments following to its spatial property. The thermal infrared band of satellite images has been used to analyze the standard normal deviated scores, which extract the centrality, while the cluster map, based upon Local Local Moran's I, has composed for understanding the autocorrelation of local spatial within environment space structure. Understanding the distribution features as well as the pivot center of thermal environments with satellite images provides principle database for updating urban thermal environments' policies and plans; because those are reference materials that should have precedence over for diverse thermal environment policies.