• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.415-415
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• 2010

면방전 구조의 AC-PDP는 페닝 혼합 기체 중에서 Xe 플라스마에서 발생되는 VUV (Vacuum Ultra Violet) 에 의해 들뜬 형광체로부터 가시광이 발생된다. Xe 여기종은 828 nm의 공명준위를 거쳐 147 nm의 진공자외선을 방출하며 823 nm의 준안정준위에서 분자선을 거쳐 173 nm의 진공 자외선을 낸다. 이러한 Xe 여기종의 밀도를 측정하기 위해서는 828 nm와 823 nm의 레이저를 외부에서 인위적으로 조사하여 측정하면 IR (Infrared)의 흡수전과 흡수후의 빛의 세기로 Xe 여기종의 밀도 및 분포를 계산할 수 있다. 본 실험에서는 823 nm에 초점을 두었으며 LAS (Laser Absorption Spectroscopy) 기법을 통하여 He-Ne-Xe(15%, 20 %, 30%) 400Torr의 3종 기체의 Xe 함량에 따른 시공간의 Xe($1s_5$) 여기종 밀도 분포와 방전효율을 관측하였다. 최근 3전극 면방전형 AC-PDP 효율 향상을 위해 3종 기체의 Xe함량비의 방전기체에 대한 연구가 수행되고 있다. 이러한 기초 데이터는 혼합기체 조건에 따른 면방전 구조의 3전극 AC-PDP의 발광 효율을 개선하는 데 유용한 자료로 활용될 것이다.

• The Korean Journal of Pain
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• v.7 no.1
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• pp.74-77
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• 1994

Since its introduction, low level lasers have been utilized in many varied clinical applications for the treatment of musculoskeletal and body surface lesions. Due to the laser beams specific characteristic-coherence, monochromaticity and unidirectionality, without adverse reaction with neighbouring tissue, physicians have used it with relative ease. We observed accelerating effects of healing process of some intractable skin wound, improvement of graft survival, as well as reduction of pain on ulcerating tissues, by treating twice weekly with low level Helium-Neon(He-Ne) and Infrared(IR) laser. The laser's energy density was set at $1\;J/cm^2$ and a fixed frequency of 600 Hz by continuous scanning. Irradiating time was calculated according to the cross diameter of the wound. Further clinical work will be required to evaluate the accelerated healing processes by biostimulating mechanisms of laser ray, especially for the intractable(diabetic) skin ulceration.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.195.1-195.1
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• 2016

Currently, as Plasma application is expanded to the industrial and medical industrial, low temperature plasma applications became important. Especially in medical and biology, many researchers have studied about generated radical species in atmospheric pressure low temperature plasma directly adapted to human body. Therefore, so measurement their plasma parameter is very important work and is widely studied all around world. One of the plasma parameters is electron density and it is closely relative to radical production through the plasma source. some kinds of method to measuring the electron density are Thomson scattering spectroscopy and Millimeter-wave transmission measurement. But most methods have very expensive cost and complex configuration to composed of experiment system. We selected Michelson interferometer system which is very cheap and simple to setting up, so we tried to measuring electron density by laser interferometer with laser beam chopping module for measurement of temporal phase difference in plasma jet. To measuring electron density at atmospheric pressure Ar plasma jet, we obtained the temporal phase shift signal of interferometer. Phase difference of interferometer can occur because of change by refractive index of electron density in plasma jet. The electron density was able to estimate with this phase difference values by using physical formula about refractive index change of external electromagnetic wave in plasma. Our guiding laser used Helium-Neon laser of the centered wavelength of 632 nm. We installed chopper module which can make a 4kHz pulse laser signal at the laser front side. In this experiment, we obtained more exact synchronized phase difference between with and without plasma jet than reported data at last year. Especially, we found the phase difference between time range of discharge current. Electron density is changed from Townsend discharge's electron bombardment, so we observed the phase difference phenomenon and calculated the temporal electron density by using phase shift. In our result, we suggest that the electron density have approximately range between 1014~ 1015 cm-3 in atmospheric pressure Ar plasma jet.

• Fire Science and Engineering
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• v.29 no.5
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• pp.29-33
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• 2015

In this study, the relations of flow rate, discharging distance and droplet size are measured in accordance with the nozzle shape. The dual type nozzles of LPN142 and LPN148, which have identical core diameter (6.0 mm) and the different radial injection angles (${\theta}_2=142^{\circ}$ and $148^{\circ}$), are manufactured. The distribution diameters with discharging distance are quantified by UL2167 test standard. The relations between discharging angle and droplet sizes, which are measured by the method of Helium-Neon laser equipment, are obtained by the empirical correlation as working pressure increase. Moreover, the extinction coefficient, which is major parameter of the radiative transport equation (RTE) is analyzed with variable droplet sizes. Thus, it is possible to opt the nozzle's shape by analyzing the relations of working pressure, spray distance, droplet size and fire characteristics at minimum allowable flow rate.

• Journal of Korean Physical Therapy Science
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• v.8 no.2
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• pp.1033-1038
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• 2001

This studies were to investigate the effects of low power Helium-Neon Infra-Red(He-Ne IR) laser on the changes of the chemical components in serum of the peripheral neuropathy in diabetic rats. The twenty one Spraque-Dawley adult male rats were assigned to the 3 groups: the control group(N=7), the diabetic group(n=7) and the laser group(n=7). The diabetic group was induced with a single intravenous injecion of 50mg/kg body weight streptozotocin dissolved to 0.01mol/L citrate buffer, pH 4.5. The experimental1asser group was irradiated low power He-Ne IR laser for 5 minutes every day during 21 days to the diabetic group. The results were as follows: 1. ALT was increased the laser treatment group than the diabetic group. but that was not significant. 2. AST was significantly increased the laser treatment group than the control group and the diabetic group. 3. LDH was significantly decreased the diabetic group and laser treatment group. 4. ALP was significantly increased the diabetic group and laser treatment group. 5. CHOL was significantly decreased the laser treatment group than the diabetic group. 6. TRIG was significantly increased the laser treatment group than the diabetic group. 7. CPK was significantly increased the laser treatment group than the control group and the diabetic group.

• Korean Journal of Acupuncture
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• v.21 no.4
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• pp.53-68
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• 2004

Objectives : Laser therapy started in 1958 when Schawlow and Townes suggested medical value of Laser therapy. He-Ne laser has been utilized as a clinical treatment for various diseases by Plog since 1975. Low Level Laser Therapy (LLLT) has been used as medication for controlling obesity in the Korean Medicine. So this study is planned to investigate the effects of LLLT on the level of serum lipid and weight gain Methods : Experimental groups were divided into normal group(Normal), high fat diet group(Control), high fat diet and LLLT by helium-neon (He-Ne) on the tail is carried out once a 2 day during 5 weeks. The animals were divided into six groups: no ischemia-induced and no LLLT-treated group (Normal), the ischemia-induced and no LLLT-treated group (Control), the ischemia-induced and 5 mW 5 min LLLT-treated group (LLLT5-5), the ischemia-induced and 30 mW 5 min LLLT-treated group (LLLT30-5), the ischemia-induced and 5 mW 10 min LLLT-treated group (LLLT5-10), 30 mW 10 min LLLT-treated group (LLLT30-10). The effect of LLLT is observed by weight gain, food intake, food efficiency, serum of lipid concentrations, liver function and HDL to total cholesterol ratio of rats fed high fat diet for 5weeks. Results : Body weight and food intake were decreased in LLL5-5, LLLT30-5, LLLT30-10. Food efficiency was decreased in LLLT30-10. The level of serum Triglyceride, Free fatty acid, AST, ALT, ALP were decreased in LLLT30-10. Serum HDL-cholesterol was increase in LLLT5-10, LLLT30-10. Also serum ALT was decrease in LLLT5-5 Conclusions : LLLT(30 mW-10 min) is effective on Body weight, food efficiency ratio, the level of serum lipid and protection of liver function by obesity induced by high fat diet, and LLLT(5 mW-5 min) act on decrease of Body weight, food intake and ALT.

• Journal of Korean Physical Therapy Science
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• v.9 no.1
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• pp.17-24
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• 2002

This studies were to investigate the effects of low power wavelengths Helium-Neon Infra-Red(He-Ne IR)laser on the changes of the blood biochemical components in burn rats. The thirty Spraque-Dewely adult male rats were assigned to the 5 groups; the experimental groups(3), the burn control group(1) and the control group(1). There was made three degree burn by the 250mW IR on the back of each rats, from 3 days after being, burned, the experimental laser groups were irradiated low power wavelengths (292Hz, 1168Hz, 4672Hz) He-Ne IR laser for 5 minutes every day during the 7days. The results wee as follows: The activities of aspirate aminotransferase(AST), alanine aminotransferase(ALT), and lactate dehydrogenase(LDH), on treated with the wavelengths ((292Hz, 1168Hz, 4672Hz) laser groups during 5 min. for 7 days were significantly increased to the control group respectively, but those of total cholesterol(CHOL) and alkaline phosphatase(ALP) were significantly decreased to the a control group (p<0.05). there were significantly decreased on the activity of alanine aminotransferase and alkaline phosphatase on the all experimental groups to the burn control group and those of lactate dehydronase on treated with 292Hz and 4672Hz wavelength9 groups to the burn control group but, were significantly increased on those of urea nitrogen (292Hz and 1168Hz)(p<0.05). The activity of AST, LDH, on treated with 1168Hz wavelengths were significantly decreased of the 292Hz and 4672Hz wavelengths groups that of ALT on the treated with 1168Hz group was significantly increased to the 4672 Hz wavelength group but those of CHOL and LDH on the 1168Hz and 4672Hz wavelength groups were dignificatly decreased to the MHz wavelengths group. As above results, the changes of the activities of biochemical conponents in the serum levels on the healing process have meaningful effected of the role of low power wavelengths He-Ne IR laser.

• The Journal of Korean Physical Therapy
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• v.9 no.1
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• pp.1-18
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• 1997

The purpose of this study is to investigate the effects of the low power Helium Neon-Infra Red(HeNe-IR) laser and the special electromagnetic therapeutic apparatus stimulation, which is usually designated as TDP by using the initial of Tending Diancibo Pu which is the Chinese inscribed with English, on wound healing in rat. The seventy-five Sprague-Dawley adult female and male rats were assigned to the experimental and control groups. Each rat was anesthetized with pentobarbital sodium, and three full-thickness incisions with 12mm length wert made on the back of the half cf the rats and three deep second degree burns were made on the back of the remainder of the rats. From 34 hours after being injured, the rats of the experimental laser group were irradiated with the 157mW electric power HeNe-IR laser for 2 minutes every day and the rats of the experimental TDP group were stimulated with TDP irradiation with the 4km spot distance for 20 minutes every day during the 17 days. The rats were sacrificed and the wound parts of its were incised on the first day, 4th day, 7th day, 10th day and 17th day respectively after the beginning of wound treatment with laser and TDP irradiation. The incised wound parts were processed appropriately for the light microscopic and electron microscopic examination. The length of incised wound was measured with microcaliper before the wound part was incised. There was a significant decrease in the length of the incised wound of the experimental laser and TDP group, compared with that of control group at 4th day, 7th day and 10th day(p<0.01) after surgery. Through the histological examination of the wound site, the more rapid epithelialization and collagen formation in experimental groups were showed, compared with control group. The histological results were analyzed and summarized as the follows; The epidermis begins to be regenerated and the granulation tissue begins to be changed to the mature pattern in the H-E stained incised skin of the laser and TDP treatment group on the 4th day. The epidermis shows the complete regeneration and the granulation tissue in the dermis in mostly to be matured in the laser and TDP treatment group on the 7th day, compared with control group. The chronic inflammatory cells are oberved and the necrosis of the collagen fibers are partially observed in control group on the 10th day. The dermis of the laser and TOP treatment group reveals relatively compactly arranged collgen bundles with the mature collagen fibers on the 10th day. The epidermis and dennis of the laser and TDP group are repaired normally and the hair follicles are well regenerated on the 17th day. The mild edema and the granulation tissue is observed in the dermis of the control groups and the delayed treatment process is observed on the 17th day. The Most of proliferated collagen fibrils are found to be compact and regular in electron micrograph of burn skin of the laser treatment group on the 10th day hut the interstitial eadema and some inflammatory cells are found in the control group. The above results suggest that through the visual and histological examination the epithelized epithelium and the proliferation of the collagen liters in the dermis occur very effectively with the low power laser treatment and the TDP treatment in the incised wound healing and the burn wound healing.