• Journal of the Korean Institute of Gas
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• v.11 no.4
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• pp.91-97
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• 2007

Recently, during the past five years, accidents of gas boiler using city gas have occurred 7.4 times more than those which use LP gas. The number of accidents has increased since the use of city gas boilers has increased. These boiler accidents resulted in 87% death from poisoning of CO, and casualty of the accidents was 4.3 times more than that of other types of accident. Hence this study makes the cause of accidents clear by separation the exhaust tube which is the cause of CO poisoning. Also, this study will establish the safety of heat-resistant silicon through testing the performance of heat-resistant silicon. The experiment showed that common silicon started hardening at $56^{\circ}C$ while the heat-resistant silicon did not begin carbonization until $606^{\circ}C$. Besides at the temperature of $150^{\circ}C$ which is the normal temperature of exhaust tube, common silicon leaked on the pneumatic test after deterioration, but the heat-resistant silicon maintained its original property. With these results, we judge that we can reduce the casualty by CO poisoning if we use the heat-resistant silicon to the connector of he exhaust tube.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2057-2058
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• 2011

We have studied that a effect saving temperature of instantaneous heater using an economical bidet due to change Silicon-Tube. The results, we have found that the existing instantaneous heater is reduced 15 [%], 20 [%] better than a new product instantaneous heater as a discharge water [${\ell}$/min] with temperature and ${\nabla}$ value, respectively. Therefore, we have showed that the innovative effect of a working process and the cost reduction because an economical bidet due to change Silicon-Tube.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.10.2-10
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• 1983

Tracheal stenosis induced from the various causes has still remained as a serious problem in the otolaryngologic field. There has been used the numerous methods in the treatment of the tracheal stenosis and the each case has required the therapeutic modality. Now, we report two cases of tracheal stenosis ; one case had been used the silicone T - tube in the tracheal stenosis after tracheostomy in 6 year - old child and the other one had been used the silicone tube stent with oral mucosa graft in the treatment of the tracheal narrowing due to inflammatory mass in 19 year - old male patient.

• Current Photovoltaic Research
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• v.6 no.2
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• pp.49-55
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• 2018

Recently solar cell industry needs the optimal design of Czochralski process for low cost high quality silicon mono crystalline ingot. Because market needs both high efficient solar cell and similar cost with multi-crystalline Si ingot. For cost reduction in Czochralski process, first of all energy reduction should be completed because Czochralski process is high energy consumption process. For this purpose we studied optimal water-cooling tube design and simultaneously we also check the quality of ingot with Von mises stress and V(pull speed of ingot)/G(temperature gradient to the crystallization) values. At this research we used $CG-Sim^{(R)}$ S/W package and finally we got improved water-cooling tube design than normally used process in present industry. The optimal water-cooling tube length should be 200mm. The result will be adopted at real industry.

• Korean Journal of Animal Reproduction
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• v.14 no.4
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• pp.281-287
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• 1990

This study was conducted to find out the changes of ovarian, placental and fetal weights and periods of pregnancy in rats implanted with progesterone-tube during the reproductive stages. One hundred and thirty-four mature rats, 10~13 weeks old, were offered for this experiment. The animals, which were implanted with silicon tubes filled with progesterone on day 15 of pregnancy, were sacrified at 18, 20, 21 and 22 days of pregnancy. The changes of ovarian, placental and fetal weights and the number of fetuses during late pregnancy were recorded. The results obtained were summarized as follows : 1. After progesterone-tube implantation, ovarian weight reached to a peak value of 92.0$\pm$0.9mg at 20 days of pregnancy, there after decreased significantly to 79.5$\pm$7.6 and 68.26$\pm$4.2mg at 20 and 22 days of pregnancy(P<0.01). 2. The placental weight increased rapidly during 15~18 days of pregnancy in control and progesterone treated rats. A peak value of 447.78$\pm$20.9mg was shown at 20 days of pregnancy after progesterone-tube implantation, and in control rats the value decreased significantly to 419.42$\pm$11.6 and 404.1$\pm$29.3mg at 20 and 21 days of pregnancy(P<0.01). 3. The fetal weights was not shown any significant differences between control and progesterone-tube implanted rats. 4. The number of fetuses in control rats were 14.75$\pm$0.4 at 8~10 days of pregnancy and 13.5$\pm$0.3 and 13.25$\pm$0.4 at 12 and 20 days of pregnancy. 5. The significant difference in periods of pregnancy was appeared between progesterone-tube implanted(27.3$\pm$0.3 days) and control(22.1$\pm$0.3 days)rats(P<0.01).

• Journal of the Korean Ceramic Society
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• v.20 no.2
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• pp.166-172
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• 1983

In this study the sillicon-alloyed isotropic pyrolytic carbon was deposited in the tumbling bed from the pyrolysis of propane and silicon tetrachloride and investigated whether the silicon-alloyed isotropic pyrolytic carbon deposited in this study was usable as bionaterial or not. The silicon-allyed isotropic pyrolytic carbon was varied by controlling the process variables such as propane con-concentration and the argon flow rate flowing in to the silicon tetrachloride bubbler at a fixed reaction bed tempera-ture of 120$0^{\circ}C$ a rotation of reaction tube of 40 rpm a bed particle weight of 7.5 g and a total flow rate of 21/min; the propane concentration was varied from 10 to 70 and the argon flow rate flowing into the silicon tetrachloride bubble from 0 to 1000 cc/min. The results show that the silicon-alloyed isotropic pyrolytic carbon was obtained at all conditions investigated, . And then the alloyed silicon content is rangion from 7 to 14.5 wt%. The density and deposition rate of deposited silicon-alloyed isotropic carbon increased axxording to silicon content and propane concentration. And the apparent crystal-size(Lc) of pyrolytic carbon is not changed with silicon content. The density and apparant crystallite size are respec-tively in the range of 1.94 to 2.06 and 20 to 25$\AA$ It is shown that the silicon-alloyed isotropic pyrolytic carbon ob-tained in this experiment is usable as biomaterial.

• Journal of the Korean institute of surface engineering
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• v.47 no.1
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• pp.20-24
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• 2014

Joule heat is generated by applying an electric filed to a conductive layer located beneath or above the amorphous silicon film, and is used to raise the temperature of the silicon film to crystallization temperature. An electric field was applied to an indium tin oxide (ITO) conductive layer to induce Joule heating in order to carry out the crystallization of amorphous silicon. Polycrystalline silicon was produced within the range of a millisecond. To investigate the kinetics of Joule-heating induced crystallization (JIC) solid phase crystallization was conducted using amorphous silicon films deposited by plasma enhanced chemical vapor deposition and using tube furnace in nitrogen ambient. Microscopic and macroscopic uniformity of crystallinity of JIC poly-Si was measured to have better uniformity compared to that of poly-Si produced by other methods such as metal induced crystallization and Excimer laser crystallization.

• Journal of radiological science and technology
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• v.28 no.4
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• pp.273-277
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• 2005

The rapid development in digital acquisition technology in radiography has not been accompanied by information regarding optimum radiolographic technique for use with an amorphus silicon flat panel detector. The purpose of our study was to compared image quality and radiation dose of an amorphus silicon flat panel detectors for digital chest radiography. All examinations were performed by using an amorphus silicon flat panel detector. Chest radiographs of an chest phantom were obtained with peak kilovoltage values of $60{\sim}150kVp$. Published data on the effect of x-ray beam energy on image quality and patient dose when using an amorphus silicon flat panel detector. It is important that radiographers are aware of optimum kVp selection for an amorphus silicon flat panel detector system, particularly for the commonly performed chest examination.

• 한국연소학회:학술대회논문집
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• 2012.04a
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• pp.25-27
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• 2012

In this paper, combustion process in the perforated silicon carbide(SiC) tube using a two dimensional approaches with GRI Mechanism 1.2 was investigated. The computational mesh structure which is divided into $60{\times}15$ and boundary conditions are set to constant mass flow rate at the inlet and constant pressure condition at the outlet respectively. Its result shows that the temperature on this peak was roughly 100K higher than the adiabatic flame temperature of 2223K for a free laminar flame at these conditions.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.14.1-14
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• 1983

The most common cause of the decannulation difficulty is the trauma. This may be accidental, iatrogenic such as prolonged intubation, high tracheostomy, secondary infection, formation of granulation tissue, improper use of cannula and wide resection of anterior tracheal wall. Another common cause is psychologic dependency. Treatments may be categorized into dilatation with or without injection of steroid, dilatation and prolonged stent, luminal augmentation and resection of the stenosis with primary reanastomosis. Recently authors experienced a case of the decannulation difficulty in a 2 - year - old which was developed after tracheostomy for the removal of bronchial foreign body and was treated with a silicon T -tube stent with good result.