• 비파괴검사학회지
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• 제28권2호
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• pp.137-143
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• 2008

안경용 구면 렌즈는 굴절력에 따라 (+)디옵터와 (-)디옵터 렌즈로 구분할 수 있다. 렌즈에 가해지는 외부 열원에 의해서 생기는 열변형은 디옵터의 종류에 따라 다르게 나타난다. 본 논문에서는 빛의 가간섭성을 이용하여 물체의 변형을 비접촉으로 정확하게 측정할 수 있는 전자처리 스페클법을 이용하여 렌즈에 발생되는 열변형을 정량적으로 측정하였다. 외부 열원에 의한 온도 분포의 측정은 실시간 비접촉으로 온도를 측정할 수 있는 적외선 열화상 카메라를 사용하였다. 실험은 총 14종의 플라스틱 상용 안경 렌즈를 대상으로 수행하였다. 동일한 온도차에서 (+)디옵터 렌즈의 경우에는 디옵터의 증가에 따라서 열변형량이 증가하였다. 반면에 (-)디옵터 렌즈는 디옵터의 증가와 관계없이 열변형량이 거의 선형적이었다. 또한 동일한 디옵터에서 (+)디옵터 렌즈의 열변형량이 (-)디옵터 렌즈의 열변형량 보다 작았다. 따라서 본 논문에서는 렌즈에 열이 가해지는 경우 렌즈의 열변형량을 정량적으로 측정할 수 있음을 확인하였다.

• Korean Journal of Acupuncture
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• 제36권4호
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• pp.210-220
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• 2019

Objectives : Warm needling is a combined treatment technique of acupuncture and moxibustion. In this study, we aimed to find out the components related with the thermal stimulation of the warm needling and to provide basic data for the guideline of the warm needling technique in the clinic. Methods : In this study, we measured thermal change of 3% agarose phantom embedding K-type thermocouples in depths of 0, 1, 2, 4, 8 and 16 mm. The warm needling was performed with acupuncture needles of various specifications (0.50×30, 0.50×40, 0.30×30, 0.30×40, 0.20×30 and 0.20×40 mm). A linear regression analysis was performed to find out the major component and quantify the effectiveness of the thermal stimulation during warm needling. Results : As a result of the measurement of temperature change, we could observe the thermal change pattern from the surface of the phantom to the 16mm deep part of the phantom. The thermal pattern was similar among the needles of different specifications. The regression analysis pointed the distance between the moxa cautery and the skin surface as the main component for the thermal stimulation of the warm needling. Conclusions : The authors suggest considering the distance between moxa cautery and the skin rather than the diameter of the acupuncture needle in accordance to the result of the study.

• 센서학회지
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• 제27권5호
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• pp.280-293
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• 2018

The conversion of an invisible thermal radiation pattern of an object into a visible image using infrared (IR) thermal technology is very useful to understand phenomena what we are interested in. Although IR thermal images were originally developed for military and space applications, they are currently employed to determine thermal properties and heat features in various applications, such as the non-destructive evaluation of industrial equipment, power plants, electricity, military or drive-assisted night vision, and medical applications to monitor heat generation or loss. Recently, IR imaging-based monitoring systems have been considered for application in agricultural, including crop care, plant-disease detection, bruise detection of fruits, and the evaluation of fruit maturity. This paper reviews recent progress in the development of IR thermal imaging techniques and suggests possible applications of thermal imaging techniques in agriculture.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.1273-1274
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• 2013

• 대한정형도수물리치료학회지
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• 제1권1호
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• pp.9-14
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• 1995

인체에서 발생하는 체열을 과학적으로 이용하여 질병을 진단하고 치료과정을 관찰하고 예후를 추측할 수 있는 Thermography는 현대의학의 임상 여러분야에서 응용할 수 있는 유용한 진단장비에 속한다 하겠다. 인체의 피부온도는 좌우 대칭적으로 온도분포를 나타내며 여러가지 생리학적인 원인에 의하여 온도는 변화할 수 있으며, 그러한 온도변화는 여러 질병과의 연관성을 갖게 된다. Thermography는 유방암세포의 증식에 따른 유방체표면의 초기온도 상승을 screening 함으로서 조기에 유방암을 발견할 수 있으며, 척추의 신경근 자극에 따른 체열분포를 파악함으로서 신경근의 이상유무 및 척추질환을 진단할 수 있으며, 말초 혈액순환 장애 등으로 인한 질환에 있어서도 뚜렷한 체표면 온도분포를 나타내 줌으로서 혈액순환의 장애분포를 시각적으로 관찰할 수 있는 이점을 지니고 있다. 또한 정형 물리치료 분야에 속하는 근-골격계 질환에 있어서의 근육통, 압통점, 염좌, 염증질환 등을 구별할 수 있고 나아가 치료 전후에 적외선 체열검사를 실시해 봄으로서 치료전이나 치료결과에 대한 객관적인 평가를 할 수 있다는데 큰 의의가 있다고 하겠다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.29-33
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• 2004

This paper presents ESPI system for the measurement of thermal expansion coefficient of STS430 up to 1,000$^{\circ}C$. Existing methods, strain gauge and moire have the limitation of contact to object and do not supply the coefficient up to 800$^{\circ}C$. There needs to measure the data up to 800$^{\circ}C$, because heat resistant materials have high melting temperature up to 1,000$^{\circ}C$. In previous studies related to thermal strain analysis, the quantitative results are not reported by ESPI at high temperature, yet. In-plane ESPI and vacuum chamber for the reduction of air turbulence and oxidation are designed for the measurement of the coefficient up to 1,000$^{\circ}C$and speckle correlation fringe pattern images are processed by commercial image filtering tool-smoothing, thinning and enhancement- to obtain quantitative results, which is compared with references data. The comparison shows two data are agreed within 4.1％ blow 600$^{\circ}C$ however, there is some difference up to 600$^{\circ}C$. Also, the incremental ratio of the coefficient is changed up to 800$^{\circ}C$. The reason is the phase transformation of STS430 probably begins at 800$^{\circ}C$.

• 한국정밀공학회지
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• 제21권11호
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• pp.69-74
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• 2004

This paper presents ESPI system for the measurement of thermal expansion coefficient of STS430 up to 1,00$0^{\circ}C$ . Existing methods, strain gauge and moire have the limitation of contact to object and do not supply the coefficient up to 80$0^{\circ}C$ . There needs to measure the data up to 80$0^{\circ}C$, because heat resistant materials have high melting temperature up to 1,000'E In previous studies related to thermal strain analysis, the quantitative results have not reported by ESPI at high temperature, yet. In-plane ESPI and vacuum chamber for the reduction of air turbulence and oxidation are designed for the measurement of the coefficient up to 1,00$0^{\circ}C$ and speckle correlation fringe pattern images are processed by commercial image filtering tool-smoothing, thinning and enhancement- to obtain quantitative results, which is compared with references data. The comparison shows two data are agreed within 4.1% blow $600^{\circ}C$ however, there is some difference up to $600^{\circ}C$. Also, the incremental ratio of the coefficient is changed up to 80$0^{\circ}C$ . The reason is the phase transformation of STS430 probably begins at 80$0^{\circ}C$

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2001년도 추계학술발표대회 논문집
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• pp.64-69
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• 2001

In general, laminate effective orthotropic thermal conductivities are dependent on fiber and matrix material properties, fiber volume fraction and fabric geometric parameters. This paper deals with the predicting method of the transverse and the in-plane thermal conductivities of plain weave fabric composites based on the three dimensional series-parallel thermal resistance network. Thermal resistance network was applied to unit cell model that characterizes the periodically repeated pattern of plain weave. Also, an experiment apparatus is setup to measure the thermal conductivities of composite material. The numerical and experimental results of carbon/epoxy plain weave are compared.

• Journal of Welding and Joining
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• 제7권2호
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• pp.25-34
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• 1989

The purpose of this work is to coat ZrO$_{2}$ - 8Y$_{2}$O$_{3}$ ceramic on the Al cast alloy(AC-8A) by using the plasma spray method. Two types of coatings which were composed of two and three layer coating were examined. Each coating powder was analyzed for shape and size distribution and X-ray diffraction pattern. For the coated layers, microstructural analysis and performance estimation which was composed of static thermal test, thermal cyclic test and thermal shock test were conducted.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.95-98
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• 2006

LCD-BLU (Back Light Unit) is one of kernel parts of LCD unit. The fabrication method of a 3-D micro mold patterned with micro-lenses for the LGP (Light Guiding Plate), one of the most important parts of LCD-BLU, was presented. Instead of dot pattern made by etching, 3-D optical pattern design with $50{\mu}m$ micro-lens was applied in the present study. The micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP. The positive micro-lens patterned injection mold with different aspect ratios (i.e. 0.3 and 0.4) was fabricated with modified LiGA with thermal reflow process. The brightness of LCD-BLU increased as aspect ratio of micro-lens increased.