• Industry Promotion Research
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• v.5 no.2
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• pp.1-7
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• 2020

This study is a technology related to a lighting lamp that illuminates indoor or outdoor lighting with light. In more detail, a see-through window is created in all directions on a case constituting the exterior, and a jade stone processed in a thin panel form is attached to the see-through window. By constructing a lighting lamp, since the soft light is irradiated indoors or outdoors through the jade stone, it provides comfort and warmth to the user, enhances the indoor or outdoor interior effect, emits far-infrared rays and negative ions, and emits a subtle floral scent It is a technology for lighting lamps using jade stones that emit. The characteristics of the product of this research and development is that the viewing window is formed in all directions on the case constituting the exterior, and the lighting lamp is composed by attaching the processed jade stone in the form of a thin panel to the viewing window. It is meaningful that they studied lightings using jade stones that generate sounds such as Buddhist scriptures, the Bible, and Sijo.

• Clean Technology
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• v.17 no.1
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• pp.19-24
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• 2011

The bubble point pressures of binary mixtures of carbon dioxide ($CO_2$) and N,N-dimethylformamide (DMF) were measured by using a high-pressure experimental apparatus equipped with a variable-volume view cell, at various $CO_2$ compositions in the range of temperatures above the critical temperature of $CO_2$ and below the critical temperature of DMF. The experimental bubble point pressure data were correlated with the Peng-Robinson equation of state (PR-EOS) to estimate the corresponding dew point compositions at equilibrium with the bubble point compositions. The experimentally measured bubble point pressures gave good agreement with those calculated by the PR-EOS. The variable-volume view cell equipment was verified to be an easy and quick way to measure the bubble point pressures of high-pressure compressible fluid mixtures.

• Applied Chemistry for Engineering
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• v.20 no.1
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• pp.94-98
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• 2009

The bubble point pressures of dimethyl carbonate and carbon dioxide mixtures were measured by using a high-pressure experimental apparatus equipped with a variable-volume view cell, at various $CO_2$ compositions in the range of temperatures above the critical temperature of $CO_2$ and below the critical temperature of dimethyl carbonate. The experimental bubble point pressure data were correlated with the Peng-Robinson equation of state (PR-EOS) to estimate the corresponding dew point compositions at equilibrium with the bubble point compositions. The experimentally measured bubble point pressures gave good agreement with those calculated by the PR-EOS. The variable-volume view cell equipment was verified to be an easy and quick way to measure the bubble point pressures of high-pressure compressible fluid mixtures.

• Journal of Chest Surgery
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• v.36 no.6
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• pp.391-396
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• 2003

Background: Recently transilluminated powered phlebectomy was introduced and used as a method of surgical treatment for varicose vein in lower extremities. The advantage of transilluminated powered phlebectomy are minimal scar and good cosmetic effect. However, the disadvantages of transilluminated powered phlebectomy is that a high priced Trivex system must be used which increases the patient's expenses. Therefore, we performed a transilluminated powered phlebectomy using an existing arthroscopic equipment instead of Trivex system and observed the effect of treatment and efficiency of the treatment. Material and Method: From March, 2000 to February, 2003, 78 patients (113 limbs) underwent transilluminated powered phlebectomy with an arthroscopic equipment. Patient's disease history, the number of operative scars and complications were reviewed. Result: The operation was performed in 133 limbs of the 78 patients (34 men, 44 women) and the age of patients were ranged from 16 to 72 years with mean age of 41.8 years. Operative time ranged from 20 to 65 minutes (average 48.7 minutes) per limb. The number of operative scar per limb from 2 to 7 (average 4.9). Postoperative complications are transient ecchymosis (78 cases) that desappeared spontaneously, edema persisting longer than 3 weeks (6 cases), remnant varicose vein (4 cases), skin perforation during operative procedure (2 cases), and contact dermatitis due to compression stocking (4 cases) The mean hospitalization day was 3.09 days. Subjective mean satisfaction degree of operation by the patients using a visual analogue scale was 92.6%. Conclusion: Our findings demonstrated that transilluminated powered phleectomy using arthroscopic equipment was possible and had good cosmetic results with acceptable complications.

• Journal of Chest Surgery
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• v.41 no.6
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• pp.803-806
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• 2008

The Nuss procedure has good cosmetic effects, but it could be cause of bleeding and organ injury during dissection of the anterior mediastinum. We have made an effort to overcome the defects of the traditional method through the anterior mediastinum, thus we developed a transilluminated introducer that made it safer and simpler to operate within a 1cm incision only. A total of 67 patients underwent the Nuss procedure using the transilluminated introducer. Thirty-six patients underwent the procedure with the transilluminated introducer only (age<4 years). Thirty-one patients had an additional thoracoscopy ($age{\geq}14\;years$). There were no major complications, such as massive bleeding or organ injury in the thoracic cavity during or after the Nuss procedure. Our findings demonstrated that the anterior mediastium could be dissected simply and safely by the use of a transilluminated introducer during the Nuss procedure without fatal major complications, such as bleeding and organ injury.

• Journal of Chest Surgery
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• v.34 no.8
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• pp.611-614
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• 2001

To determine the efficacy and safety of endoscopic resection and ablation of superficial varicosities using a powered vein resector, irrigated illuminator. Material and Method: 83 consecutive patients were involved in the study. 103 limbs in 83 patients were treated using a minimal invasive, powered, vein resecting devide with cutaneous transillumination and tumescent anesthesia technique. There were 51 women and 32 men. All patients were operated under general anesthesia or regional anesthesia. Operative time and patient satisfaction scores were recorded along with the number of incisions made. Result: 83 patients(51/61.4% female, 32/38.6% male, aged 25-78 years) had varicose vein. Average age at the time of operation was 45 years(range, 25 to 78 years). There were 63 unilateral procedures and 20 bilateral operations. Operative time ranged from 24 to 46 minutes (average 35.3 minutes) in the unilateral procedure. The number of incisions per limb averaged 2.7(range, 2 to 5). Postoperative complications occurred in 7(8.4%) patients. Patients were asked to describe their pain on an analog scale ranging form 1 to 10 with r representing no pain and 10 worst imaginable pain. Immediately postoperative pain score was 2.4 Postoperative pain score at 72 hours had a mean score of 2.0. Postoperative pain score at 1 months were 1. Conclusion: Varicose vein removal using Transilluminated Powered Phlebectomy(TIPP) is a safe and efficient procedure. The procedure saves time, is easy to perform, and gives direct visualization and a distinct endpoint of the removal of veins. It is also less tedious to perform and gives good cosmetic results with significant pain relief.

• Journal of Chest Surgery
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• v.38 no.6 s.251
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• pp.415-420
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• 2005

Recently the cases of varicose veins are increasing because the patients with latent disease have come to realize that they want a positive treatment. Accordingly, the purpose of this study is to compare and analyze two methods the conventional phlebectomy (CP) and transiliuminated powered phlebectomy (TIPP). Material and Method: From March 200f to December 2004, 114 patients (167 legs) with varicose vein were operated in Pusan National University Hospital. A retrospective review was performed on the clinical records. We analyzed age, sex, duration of illness, chief complaints, duplex doppler findings, number of skin incisions, operative time, length of hospitalization, complications, and remnant lesions. Result: Operative time was significantly shorter in the TIPP group than CP group (for one leg $108.4\pm27.6\;min\;vs\;83_4\pm24.4\;min,\;for\;both\;legs\;184.7\pm28.4\;min\;vs\; 137.8\pm24.4\;min)$. There was signifcant statistical difference in average number of skin incisions per leg between the CP group and the TIPP group $(5.9\pm2.2\;vs\;4.2\pm1.6)$. Mean duration of hospitalization was Significantly shorter in the TIPP group than CP group $(4.4\pm1.0\;days\;vs\;5.8\pm1.9\;days)$. Complications were pain $(15.9\%)$, remnant lesion $(9.5\%)$, and ecchymosis $(4.8\%)$ in the CP group and ecchymosis $(19.6\%),\;pain\;(7.8\%),\;and\;remnant\;lesion\;(7.8\%)$ in TIPP group. Sclerotherapy or reopertaion was done for the patients who had remnant lesions. Conclusion: Transilluminated powered phlebectomy in varicose vein could reduce operative time and number of skin incisions, and almost completely removed the multiple lesions. Although there were postoperative complications such as ecclymosis, they were absorbed within 2 months and patients were satisfied. Therefore, TIPP is a more effective operative technique than conventional phlebectomy in varicose veins.

• Journal of Chest Surgery
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• v.35 no.2
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• pp.144-148
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• 2002

The present study was done to determine the efficacy and safety of varicose vein removal using a minimally invasive, powered vein-extracting device with cutaneous transillumination and tumescent anesthesia techniques and then compared this to a retrospective group of conventional phlebectomy operations. There were 133 limbs in 104 patients(72 women, 32 men) treated with the use of the vein extractor aided by transcutaneous illumination. The hydrodissection was performed with Trivex™ Irrigated illuminator(Smith & Nephe $w^{ R}$) system using normal saline after the 2~3mm sized skin incision. Varicose clusters were extracted by the use of TriveTM esector(Smith & Nephe $w^{ R}$) system under transillumination. After the varisoce vein extraction, the operation area was compressed with surgical pad for bleeding control. The complication rate was 3.84% The mean number of incisions was 3.24 and mean operative time per limb was 65.9 minutes. The mean hospitalization was 1.86 days. The varicose vein extraction using transilluminated powered phlebectomy(TIPP) is a safe, efficacious and cosmetically satisfactory method. The procedure decreases the operating time and the number of incisions required to remove varicose clusters. Further evaluation and long term follow up will be necessary to determine the recurrence rate and long termcomplications.to determine the recurrence rate and long termcomplications.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.8
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• pp.1546-1552
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• 2016

In addition, because it uses preheating to dissolve an alloy in general, it is hard to regulate the appropriate melting temperature of the alloy and brewing time and shows the defect of the supplementation thing due to the super-heating. Once the alloy is molten and then most of the casting by attaching a sight glass or non-contact temperature sensor is suitable casting temperature the operator pressing a button to generate a centrifugal force to inject the molten alloy into a crucible in the casting ring. These results, and most of the cast temperature is too high or too low to generate a lot of casting defects do not get into a uniform cast body. In this paper, we developed a dental casting machine for high frequency using a single temperature sensor which can measure the actual temperature of the alloy than the temperature of the external non-contact measurement using a temperature sensor.

• Korean Chemical Engineering Research
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• v.55 no.2
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• pp.230-236
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• 2017

Solubility data of carbon dioxide ($CO_2$) in poly(ethylene glycol) dimethyl ether (PEGDME) are presented at pressures up to about 50 bar and at temperatures between 303 K and 343 K. The solubilities of $CO_2$ were determined by measuring the bubble point pressures of the $CO_2+PEGDME$ mixtures with various compositions using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. To observe the effect of the PEGDME molecular weight on the $CO_2$ solubility, the $CO_2$ solubilities in PEGDME with two kinds of molecular weight were compared. As the equilibrium pressure increased, the $CO_2$ solubility in PEGDME increased. On the other hand, the $CO_2$ solubility decreased with increasing temperature. When compared at the same temperature and pressure, the PEGDME with a higher molecular weight gave smaller $CO_2$ solubility on a mass fraction and molality basis, but gave greater $CO_2$ solubilities on a mole fraction basis.