• Journal of Oriental Medical Thermology
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• v.7 no.1
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• pp.55-65
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• 2009

Purpose: This study was performed to evaluate DITI (Digital Infrared Thermographic Imaging)'s potential for diagnosis and indicator of abdominal cold hypersensitivity treatment from the clinical case study. Methods: The patient was a 35-year-old woman who was suffered by general coldness, sweating and general pain. The patient was treated by Herb medicine, Acupuncture treatment, Moxa treatment and Physical Treatment. The progress of symptoms was evaluated by checking the change of VAS, and inspecting the DITI. We studied the statistical significance from the difference of DITI results before and after treatment by paired T-test using SPSS windows (version 12.0). Results: The general coldness, sweating and general pain of this patient have declined, especially the abdominal coldness improvement showing. As a results, the temperature of four abdominal sites(GV4,6,12,17) after treatment were statistically higher than those before treatment. With comparison of Indang, DITI difference of abdominal sites before and after treatment were statistically significant from paired T-tests. Conclusion: The results suggest that DITI can be used for the diagnosis and assessment of abdominal cold hypersensitivity treatment.

• Journal of Oriental Medical Thermology
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• v.6 no.1
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• pp.69-75
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• 2008

Purpose: We investigated the effect of far-infrared radiating products on cold hypersensitivity of lower limbs using CST. Methods: 7 patients with cold hypersensitivity of lower limbs were investigated in this study. Exclusive criteria was skin diseases, spinal nervous disease and external wounds. They were asked to answer the VAS of cold hypersensitivity at baseline and after 3 weeks. We measured temperature of lower limbs with Spectrum 9000 MB (Dorex Inc, USA). We performed cold stress test (CST) by 3 thermographic observation using DITI : 1st was taken after 15 minutes resting at $25^{\circ}C$, the 2nd was immediately taken after 1 minute soak in $20^{\circ}C$ water, the 3rd was taken at 15 minutes after soak. We performed 3 times of CST : 1st CST was perfomed at baseline, 2nd CST was perfomred after 1 week and just observation, 3rd CST was performed after 1 week using far-infrared radiating products (lasner, UMT, Korea). Results: After using products, temperature of foot incresed more than thigh area, but there was no significance. There was no statistical difference of VAS, change of temperature and CST between before and after using far-infrared radiating products. Conclusion: There was no statistical effect of far-infrared radiating products on change of temperature of lower limbs.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.11a
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• pp.24-24
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• 2003

Research activity in the III-V nitrides materials system has increased markedly in the past several years ever since high-brightness blue light-emitting diodes (LEDs) became commercially available. Despite of excellent optical properties of the GaN, however, inherently poor thermal property of the sapphire used as a substrate material n these devices may lead to thermal degradation of devices, especially during their high power operation. Therefore, dependable thermal analysis and packaging schemes of GaN-based LEDs are necessary for solid lighting applications under high power operation. In this paper, emphasis will be placed upon thermal design of GaN-based LEDs. Thermal measurements of LEDs on chip and packaging scale were performed using the liquid crystal thermographic technology and micro thermocouples for different bias conditions. By a series of optical arrangement, hot spots with specific transition temperatures were obtained with increasing input power. Thermal design of LEDS was made using the finite element method and analytical unit temperature profile approach with optimal boundary conditions. The experimental results were compared to the simulated data and the results agree well enough for the establishment of dependable prediction of thermal behavior in these devices. The paper will present a more detailed understanding of the thermal analysis of the GaN-based blue and white LEDs for high power applications.

• Journal of Korean Neurosurgical Society
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• v.29 no.2
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• pp.274-279
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• 2000

A 35-year-old female patient who had been paraplegic since her upper thoracic cord injury one and a half years before was presented with a syringomyelia involving C7 to T2 cord segments on follow-up magnetic resonance imaging(MRI). Her pain on the chest and bilateral axilla worsened since about 2 years after initial injury, and MRI demonstrated a progressively enlarging cystic syrinx cavity of the cervicothoracic cord. The posttraumatic syringomyelia was managed operatively by lysis of the arachnoid adhesions, myelotomy, and expansile duraplasty. Post-operatively her pain was relieved, and MRI showed decrease in size of the syrinx, and digital infrared thermographic imaging(DITI) showed diminution of the hyperthermic area on the anterior chest. In conclusion, the posttraumatic syringomyelia can be managed successfully without shunt operation. It seems apparent that expansile duraplasty is effective in controlling the posttraumatic syrinx.

• Journal of the Korean Society for Nondestructive Testing
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• v.27 no.2
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• pp.142-147
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• 2007

In order to measure corrosion level of steel reinforcement rebar which is inside reinforced concrete structure, infrared thermographic technique was employed. Experimental test parameters were four different ambient temperatures and various levels of corrosion states (0, 1, 3, 5, 7 and 10% of weight loss). After analysis of temperature distributions of concrete surface, the amount of heat flux from the concrete surface is directly proportional to the corrosion level which is inside of concrete.

• Journal of Acupuncture Research
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• v.23 no.1
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• pp.155-164
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• 2006

Objectives : The aim of this study is to validate the correlation between Assessment Instruments of Knee OA and digital infrared thermographic imaging(DITI) and to find out the methods to assess knee OA by DITI. Methods : 60 subjects were evaluated. They were asked to answer VAS pain scale, WOMAC, KHAQ and LFI. Correlation was assessed by examining the spearman's rank correlation coefficients. Results : VAS, WOMAC and LFI was correlated with not only the thermal difference between Ant. knee and Post. knee, but also the lowest temperature of Ant. knee. Conclusion: DITI value was useful for evaluating the degree of OA. And we should find out that decrease of pain is correlated with change of DITI value.

• Korean Journal of Oriental Medicine
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• v.18 no.1
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• pp.53-57
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• 2012

Objectives : The purpose of this study was to check diagnostic performance of infrared thermography for patients with vascular claudication. Methods : 3 patients with vascular claudication were diagnosed with Digital Infrared Thermal Imaging(DITI) and compared the relative temperature difference between the right and left. Results : Symptomatic legs showed significant low body temperature and at the very site patients complained of pain on, the body temperature differed distinctly between the right and left. Conclusions : Infrared thermographic diagnosis with clinical symptoms may be helpful in diagnosing suspected vascular claudication.

• Journal of Oriental Medical Thermology
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• v.1 no.1
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• pp.20-26
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• 2002

The flowing of Liver Qi upwards and outwards in all directions means importance especially for women because they are based on blood which is derived from Liver by the theory of oriental medicine. The function of Liver Qi is considered to be reflected at Rt. upper abdomen by meridian theory of oriental medicine. The body temperature was assesed ay DITI. Thermographic measurements were performed on 2 areas. All data were coded for computer analysis and significance were tested by unpaired T test. DITI revealed the significant hyperthermia of Rt. upper abdomen on the Liver Qi stagnation patients. These results suggest that the difference between upper and lower abdomen temperature is remarkably related to occurrence of Liver Qi stagnation. DITI may be favorable to the diagnosis and assessment of Liver Qi stagnation.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.24 no.2
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• pp.251-255
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• 2015

Thermal deformation, such as bending and twisting, occurs among the polymer parts of air-conditioner indoor units because of repetitive temperature change during heating operation. In this study, a numerical method employing finite-element analysis to efficiently simulate the thermal deformation of an assembly is proposed. Firstly, the displacement of an actual assembly produced by thermal deformation was measured using a 3D optical measurement system. The measurement results indicated a general downward sag of the assembly, and the maximum displacement value was approximately 1 mm. The temperature distribution was measured using a thermographic camera, and the results were used as initial-temperature boundary conditions to perform temperature-displacement analysis. The simulation results agreed well with the measured data. To reduce the thermal deformation, the stiffness increased 100%. As the results, the maximum displacement decreased by approximately 5.4% and the twisting deformation of the holder improved significantly.

• Journal of the Korean Society for Nondestructive Testing
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• v.35 no.5
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• pp.341-348
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• 2015

Active infrared thermography methods have been known to possess good fault detection capabilities for the detection of defects in materials compared to the conventional passive thermal infrared imaging techniques. However, the reliability of the technique has been under scrutiny. This paper proposes the lock-in thermography technique for the detection and estimation of artificial subsurface defect size and depth with uncertainty measurement.