• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2009.05a
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• pp.255-256
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• 2009

The anti suck back centering (ASBC) for preventing backflow of oil for oil rotary pump was designed in the power failure. To evaluate the evacuation characteristics, we manufactured the mini vacuum system, personal computer, AD converter (National instrument, NI-6009), and automatic controller with touch panel for a basis. In this study, we measured the evacuation characteristics of ABSC and analyzed the flow field of viscous flow regime using a commercial software, CFD-ACE+. Also, the leakage of the advaced ASBC for leveling was measured.

• Proceedings of the Korean Vacuum Society Conference
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• 2008.02a
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• pp.379-379
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• 2008

• The Journal of Korea CHUNA Manual Medicine
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• v.4 no.1
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• pp.157-165
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• 2003

Low back pain (LBP) is a significant in today's society, with lifetime include factors associated with LBP ar reporter. Among the causes, aberration of posture may play a role in the development of LBP. Many investigators have assessed the curvature of spine in standing posture. But LBP is associated with Lumber Hyperlordosis of Hyperlordosis is controversial Subjects: In conservative treatment(acupuncture, herb med, manipulation & TENS. exercise, potural correction) for a 40 years old woman who had low back pain(V AS) be caused by decrease lumbar lordotic angie. Objectives: The object is change of lumbar lordotic angle of a 40 years old woman who had low back pain with Lumbar hyperlordosis, In conservative treatment. Method: In conservative treatment, We added taping therapy(mechanical correction taping of Kinesio Taping) about Lumbar Lordosis. Conclusion: We experienced a 40 years old woman who had love pack pain with Lumbar hyperlordosis. In conservative treatment, Her pain was Improved by additional taping therapy In company with decrease of Lumbar Lordosis. 1. abnormal spinal curvature, specially lumbar hyperlordosis act on induction & perpetuation agent for low back pain 2. In a patient had low back pain with lumbar hyperlordosis, change of lumbar lordotic angle is of utility value for the effect of treatment and assessment of prognosis. 3. pain control is more relative with change of lumbosacral angle than lumbar lordotic angle, in patient had low back pain with lumbar hyperlordosis. 4. mechanical taping therapy with elastic adhesive tape is effective for patient had low back pain with lumbar hyperlordosis

• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.6
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• pp.88-96
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• 2006

The objective of this research works is to develop back panel dies of PDP TV with a large size. In order to design the geometry of the dies and an initial size of blank optimally, the finite element analysis has been carried out using AUTOFORM V4.2. The conner radius of the upper trimming area and the distance from the outer line of the blank holder to the outer line of the blank have been selected as design parameters to remove the wrinkling of the trimming area. The results of the analyses have been shown that a feasible product without wrinkles and skid lines can be obtained when the conner radius ranges from 6mm to 8mm and the distance lines in the range of 40-60mm. From the proposed design of the dies and an initial blank size, the final die set of the back panel has been successfully manufactured.

• Journal of Korean Neurosurgical Society
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• v.29 no.3
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• pp.420-425
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• 2000

Epidural steroid injection(ESI) has been a commonly applied conservative therapy for the management of chronic low back pain and sciatica. However, there are many reports concerning various local, systemic and neurological complications related to ESI. We report two cases with fatal complications after ESI for low back pain and sciatica. In both patients, ventriculitis and meningitis were causative factors to be fatal. Aseptic procedures and careful post-procedure assessment are essential to avoid serious complications following ESI.

• The Journal of Korean Academy of Prosthodontics
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• v.36 no.1
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• pp.64-80
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• 1998

The risk of cross-contamination in dental clinic is very high. Those who are engaged in dental clinic are exposed to various microorganisms in saliva and blood of patient. Potential possibility of cross-contamination of patient to patient, patient to dentist, dentist to laboratory technician always exist, which is important in the view of public health. It is well known that microorganisms may cause cross-contamination by suck-back of microorganisms into the water supply line or air supply line of dental unit and sprayed back into the next patient's oral cavity. The majority of microorganisms coming from dental unit are water microorganisms from the main water supply which have colonized the tube within the units and multiplied in the relatively warm and stagnant conditions. The purpose of this study is to measure the extent of microbial contamination of dental unit and ultrasonic scaler, to evaluate that dental unit water supply is suitable for drinking water, and to assess the effect of flushing on reduction of microbial contamination of dental unit and ultrasonic scaler. In the first experiment, water samples(50ml) from 20 dental units and 10 ultrasonic scalers in Seoul National Univ. Hosp. were tested for the presence of coliform. The samples were filtered by membrane filtration technique.(Microfil system, Millipore Co. U. S. A.) The filter was then placed onto MacConkey agar plate and the plates with filter on it were incubated aerobically at $37^{\circ}C$ for 5 days. The colors and shapes of colonies were examined if those were coliform. To verify the presence of coliform, the colonies were inoculated into phenol red lactose broth and incubated aerobically at $37^{\circ}C$ for 2 days. The fomation of gas was observed. In the second experiment, water samples from 20 handpieces, 10 ultrasonic scalers and 30 A/W syringes after 0, 2, 4, 6 min. flushing respectively were taken. $200{\mu}l$ water samples were spreaded on Brain Heart Infusion agar plate and the plates were incubated aerobically at $37^{\circ}C$ for 5 days. The number of colony was counted. The results obtained were summarized as follows 1. The water from dental unit and ultrasonic scaler was not suitable for drinking water. 2. No coliform was founded in dental unit and ultrasonic scaler water supply. 3. The number of colony of dental unit and ultrasonic scaler was highest in the group of o min. flushing(p<0.05). 4. There was no statistically significant difference in the extent of microbial contamination among handpiece, ultrasonic scaler and A/W syringe (p>0.05). 5. The number of colony was lowest in the group of 4 min. flushing, but there was no statistically significant difference among 2, 4, 6 min. flushing groups.(p>0.05) 6. It is recommended to flush dental unit water line for 4 min. after use on each patient.

• Transactions of Materials Processing
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• v.29 no.4
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• pp.218-228
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• 2020

The prediction of final mass and optimized process conditions of injection molded products using Artificial Neural Network (ANN) were demonstrated. The ANN was modeled with 10 input parameters and one output parameter (mass). The input parameters, i.e.; melt temperature, mold temperature, injection speed, packing pressure, packing time, cooling time, back pressure, plastification speed, V/P switchover, and suck back were selected. To generate training data for the ANN model, 77 experiments based on the combination of orthogonal sampling and random sampling were performed. The collected training data were normalized to eliminate scale differences between factors to improve the prediction performance of the ANN model. Grid search and random search method were used to find the optimized hyper-parameter of the ANN model. After the training of ANN model, optimized process conditions that satisfied the target mass of 41.14 g were predicted. The predicted process conditions were verified through actual injection molding experiments. Through the verification, it was found that the average deviation in the optimized conditions was 0.15±0.07 g. This value confirms that our proposed procedure can successfully predict the optimized process conditions for the target mass of injection molded products.

• Journal of Korean Neurosurgical Society
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• v.41 no.4
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• pp.258-260
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• 2007

Multiple aneurysms at the same cerebral arterial branching site are rare, and have been mainly described in a few case reports in comparison with other intracranial multiple aneurysms. Most reported locations of the same artery where multiple aneurysms developed were internal carotid artery and anterior communicating artery. We experienced a very rare case of multiple aneurysms arising at the same bifurcation site of the middle cerebral artery. Only one case like this has been reported previously in the literature. We discussed the preoperative diagnosis and surgical management of such condition.

• Journal of Haehwa Medicine
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• v.13 no.1
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• pp.269-277
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• 2004

1. The frequency of source of prescriptions is Dongweonshibse(東垣十書), Hagansanghansamyukse(河間傷寒三六書), Senmyoungronbang(宣明論方), Gogumuigam(古今醫鑑), Dangyesimbob(丹溪心法), Uihakgangmok(醫學綱目), Taepyonghyeininhwajekukbang(太平惠民和劑局方) in sequence. 2. The classification of prescriptions by efficacy is Haepyoy(解表藥), Igiyak(理氣藥), Boikyak(補益藥), Sahayak(瀉下藥), Chongyo1yak(淸熱藥等), etc., in sequence. 3. The frequency of used medicine is Gangwhal(羌活), Insam(人蔘), Hwangbaek(黃柏), Gamsu(甘遂), Jadakek(紫大戟), Daehwang(大黃), Seungma(升麻), Shiho(紫胡), Bangpung(防風), Jinpi(陳皮), Oyak(烏藥), Chongung(川芎), Changchul(蒼朮), Gobon(藁本), etc., in sequence. 4. The Song(性) of used medicine is mainly Onsong(溫性) and Hansong(寒性), the mi(味) is Sinmi(辛味), Gomi(苦味), Gammi(甘味), Hammi(鹹味) in sequence, the Gwigyong(歸經) is Bigyong (脾經), Wigyong(胃經), Gangyong(肝經), Paegyong(肺經), etc., in seguence.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2006.11a
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• pp.87-90
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• 2006

This study investigates the temperature history of slab mock-up specimens for hot weather concreting applying various surface insulating methods, in order to improve concrete quality at hot weather condition. Test showed that the use of insulating blanket or a bubble sheet on upper section of slab prevented from abrupt increase of temperature and vaporization of moisture during early curing at hot weather circumstance. In addition, it secured higher strength at early age. Therefore it is concluded that concrete construction insulating with the bubble sheet will reduce the plastic and drying shrinkage as well as improve strength at early age, thus securing concrete duality.