• 사상체질의학회지
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• 제32권4호
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• pp.45-64
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• 2020

Purpose This study was to develop and study 'Diagnostic Index for the Ordinary Symptom of Soyangin'. Methods The main diagnosis and evaluation index symptoms of Soyangin were extracted based on 『Donguisusebowon』 and Clinical Practice Guidelines for Sasang Constitutional Medicine Symptomatology; CPG for soyangin. The selected ordinary symptoms were divided into 4 categories such as Exterior-Cold ordinary symptom (表寒素證), Exterior-Disease unfavorable's ordinary symptom (表病逆證素證), Interior-Heat ordinary symptom (裏熱素證), Interior-Disease unfavorable's ordinary symptom (裏病逆證素證) of Soyangin and translated into Korean. And the inclusion, importance and translation validity of major diagnosis and assessment indicators of Soyangin were surveyed online by a group of Sasang constitutional experts. Results & Conclusions 29 ordinary symptoms and pathological mechanism were selected from references and translated into 51 Korean symptoms. After inclusion yes or no survey by expert group, 45 symptoms were selected. The importance survey showed that 'Have a soft stool' of Exterior-Cold ordinary symptom indication, '(If you're stressed, if you're not in good health) Have a soft stool or diarrhea' of Exterior-Disease unfavorable's ordinary symptom, 'The feces harden easily' of Interior-Heat ordinary symptom and '(If you're stressed, if you're not in good health) Have an upset stomach' of Interior-Disease unfavorable's ordinary symptom were the most important. Finally, [Diagnostic Index for the Ordinary Symptom of Soyangin] was completed after survey of translation validity, reflection of individual opinions by the expert committee, and application of weighted value calculated from the importance survey.

• 융복합기술연구소 논문집
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• 제10권1호
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• pp.13-17
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• 2020

Among the factors that must be taken into account when using thermal imaging cameras that are expanding their application to various fields, a basic study was conducted focusing on temperature on the effect of solar radiation on the photographed thermal image. Through all experiments, in order to use an image taken with a thermal imaging camera for an object installed or located outdoors, a separate temperature correction according to the size of solar radiation or a separate device to block the effect of solar radiation must be additionally installed. Since the temperature of the same object may vary in the thermal image taken indoors or outdoors, it is necessary to calibrate it through comparison with other temperatures as a reference point. In the case of measuring the temperature of a glossy surface such as metal indoors with a thermal imaging camera, it was confirmed that an environment that can remove the light reflection effect by the glossy surface must be constructed and photographed.

• Journal of Welding and Joining
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• 제24권6호
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• pp.28-32
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• 2006

Laser Transmission Joining (LTJ), which is a joining process of polymers by using different transmission rates of materials, was studied numerically. Unlike previous studies, energy loss by reflection at the surface was included. Besides, energy absorbed in the transparent substrate is also considered to increase the accuracy of the analytical results. Furthermore, thermal deformations of the substrates were also calculated. Temperature distribution of the substrates on the joining process could be effectively predicted by using the thermal analysis model developed, which could also analyze the rising phenomenon of the absorbing substrate by bulge effect. Calculated results show that temperature of the absorbing substrate is higher than that of transparent substrate when the laser is being radiated, and this temperature difference causes more thermal deformation in absorbing substrate, which results in the surface rise of the absorbing substrate. Comparison of calculated results with corresponding experimental results could confirm the validity of the numerical analysis model proposed.

• Journal of Welding and Joining
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• 제25권2호
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• pp.43-48
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• 2007

Laser Transmission Joining (LTJ) of plastics is a process in which light of suitable wavelength is transmitted through a transparent substrate that is in contact with an absorbing one. In this paper, LTJ is investigated by preliminary experiments from the viewpoint of mechanical engineering. To understand transmitting characteristics of each polymer substrate, transmission rate, reflection rate and absorption coefficient of polymer are measured by using a laser power-meter. Characteristics of joining in the spot welding and seam welding are investigated by measuring the fracture load. Fracture load increases in accordance to the laser power and irradiation time. However, when the laser power is over 60W and irradiation time over 4seconds, fracture load decreases. This phenomenon is probably due to heat-softening of materials. Besides, cavities are generated at a joint by evaporation of water molecules, which can be suppressed by introduction of a gap between two substrates.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1317-1321
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• 2007

Aluminized steel sheet that Al coated on low carbon steel has a excellent heat resistance, thermal reflection and corrosion resistance. It has applied to fuel tank, automotive exhaust systems, etc. Laser weldability of the aluminized steel for the full penetration welding will be described in this paper. We focused on the effect of Al coating conditions on weld strength. For these objectives, aluminized steel sheets that has various thickness and coating weight were prepared for laser welding. And then, tensile-shear and hardness test were carried out. At that same time, Al content mixed in weld after laser welding was evaluated and investigated a correlation between the mixed Al and mechanical properties. Besides, as removing partially coating layer, weldability has been investigated according to position of coating layer. As a result of this study, as increasing Al content in weld, tensile-shear strength was decreased. Also it was identified that Al of coating layer caused grain growth.

• 한국음향학회지
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• 제22권2호
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• pp.113-120
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• 2003

레일리는 수학적 이론에 능했을 뿐 아니라 실험 음향학자로서 중요한 기여를 했다. 그는 리케의 열에 의한 음발생 장치와 노래하는 불꽃을 순음발생 장치로 개선했다. 무엇보다는 그가 만든 인공 새소리 발생장치는 실험용음원의 개선에서 결정적으로 기여했다. 이 장치는 초음파를 발생시켜 실험실 안에서 소리의 직진, 굴절, 회절, 간섭의 실험을 교란 없이 수행할 수 있게 해주었다. 또한 레일리는 소리의 검출장치로서 민감 불꽃을 개선했다. 그는 또한 정밀한 회전속도 조절장치 (소리바퀴)와 소리의 절대 세기를 측정하는 장치 (레일리 원반)를 만들어 실험 음향학의 정밀성의 증진에 기여했다.

• Carbon letters
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• 제8권4호
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• pp.313-320
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• 2007

In the present study, electrospun PAN precursor webs and the stabilized and carbonized nanofiber webs processed under different heat-treatment conditions were characterized by means of weight loss measurement, elemental analysis, scanning electron microscopy (SEM), attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), thermogravimentric analysis (TGA), and X-ray diffraction (XRD) analysis. The result indicated that stabilization and carbonization processes with different temperatures and heating rates significantly influenced the chemical and morphological characteristics as well as the thermal properties of the stabilized and then subsequently carbonized nanofiber webs from PAN precursor webs. It was noted that the filament diameter and the carbon content of a carbonized nanofiber web as well as its weight change may be effectively monitored by controlling both stabilization and carbonization processes.

• Journal of Advanced Marine Engineering and Technology
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• 제30권5호
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• pp.636-644
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• 2006

Recently, there were some successful examples that the laser welding was introduced into production line. However, the spread of laser welding is not sufficient in many industries. There are several reasons why it is difficult to penetrate the laser welding into production lines. Because it is different from reflection, absorption and permeation of laser beam according to material and surface condition. Moreover, there are significant problems in processing such as absorption and scattering of beam by the induced plasma or plume. Therefore, understanding of mechanism on formation of weld defect in laser welding of the laminated core for motor is very important. In this paper, it was analyzed in terms of materials which was source of defect in laser welding and conventional arc welding. As a results of analysis, insulation coating film of the laminated core was judged to main factor of weld defect. it could be well aware as tracing carbon volume, and it was deduced that weld defect by insulation coating film was caused by difference of mechanism between the two heat sources.

• 비파괴검사학회지
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• 제36권2호
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• pp.130-137
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• 2016

Non-destructive testing methods for composite materials (e.g., carbon fiber-reinforced and glass fiber-reinforced plastic) have been widely used to detect damage in the overall industry. This study detects defects using optical infrared thermography. The transient heat transport in a solid body is characterized by two dynamic quantities, namely, thermal diffusivity and thermal effusivity. The first quantity describes the speed with thermal energy diffuses through a material, whereas the second one represents a type of thermal inertia. The defect detection rate is increased by utilizing a lock-in method and performing a comparison of the defect detection rates. The comparison is conducted by dividing the irradiation method into reflection and transmission methods and the irradiation time into 50 mHz and 100 mHz. The experimental results show that detecting defects at 50 mHz is easy using the transmission method. This result implies that low-frequency thermal waves penetrate a material deeper than the high-frequency waves.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.251-252
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• 2018

Cool roof coating materials generally use white color which has the highest reflectance, but it is a tendency to apply various colors because it can cause glare and fatigue of a nearby building user due to the urban beauty and high reflection. This study when applying color diversity material cool roof coating was carried out as a basic research for the degree of solar radiation reflectance change. Experiment result. As a result of the measurement of the reflectance of each specimen, white showed the best reflectance in the near infrared region, and black had the lowest reflectance. Also, in case of brown, it was confirmed that the reflectance of solar radiation in the near extrinsic region is lower than that of gray.