• Journal of the KSME
• /
• v.50 no.8
• /
• pp.51-53
• /
• 2010

이 글에서는 항공우주왕복선의 엔진설계 시 사용되었던 CFD(Computational Fluid Dynamics) 기술을 인공심장 개발에 어떻게 적용하여 심장보조장치(Ventricular Assist Device)를 만들었는지 소개하고자 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2013.05a
• /
• pp.435-436
• /
• 2013

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1312_1313
• /
• 2009

In this study the fabrication technique of the planner field emission device structure with a DLC layer were studied. The bottom Mo electrode using electrochemical method on the DLC layer deposited using assist sputtering.

• 순환기질환의공학회:학술대회논문집
• /
• 2003.11a
• /
• pp.26-27
• /
• 2003

• Nuclear Engineering and Technology
• /
• v.34 no.5
• /
• pp.502-516
• /
• 2002

Wolsong NPP are CANDU6 type reactors and there are 4 CANDU6 type reactors in commercial operation. CANDU type reactors require on-power refuelling by two remote controlled F/Ms (Fuelling Machines). Most of channels, fuel bundles are float by channel coolant flow and move toward downstream, however in about 30% of channels the coolant flow are not sufficient enough to carry fuel bundles to downstream. For those channels a special device, FARE (Flow Assist Ram Extension) device, is used to create additional force to push fuel bundles. It has been showing that during fuelling operation of some channels the channel coolant flow rate is reduced below specified limit (80% of normal), and consequently trip alarm signal turns on. This phenomenon occurs on selected channels that are instrumented for the channel flow and required to use the FARE device for refuelling. Hence it is believed that the FARE device causes the problem. It is also suspected that other channels that do not use the FARE device for refuelling might also go into channel flow low state. The analysis revealed that the channel How low occurs as the FARE device is introduced into the core and disappears as the FARE device is removed from the core. This paper presented the FARE device behavior, detailed fuelling operation sequence with the FARE device and effect on channel flow low phenomena. The FARE device components design changes are also suggested, such as increasing the number or now holes in the tube and flow slots in the ring orifice.

• Physical Therapy Rehabilitation Science
• /
• v.5 no.3
• /
• pp.125-131
• /
• 2016

Objective: The purpose of this study was to investigate the effects of providing visual feedback and auditory stimulation using a robotic device on balance and gait abilities in stroke patients. Design: Randomized controlled pilot trial. Methods: Fifteen subjects were randomly divided into three groups where five subjects were in the visual feedback robotic device assist gait training (VRGT) group, five subjects in the auditory stimulation robotic device assist gait training (ARGT) group, and five subjects in the control group. Subjects received visual feedback and auditory stimulation while undergoing robotic gait training for 45 minutes, three times a week for 2 weeks, and all subjects had undergone general physical therapy for 30 minutes, five times a week for 2 weeks. All subjects were assessed with the Berg balance scale (BBS), timed up and go (TUG) test, and 10-meter walking test (10MWT) pre- and post-intervention. Results: All subjects showed that BBS, TUG test, and 10MWT scores significantly improved post-intervention (p<0.05), and the control group also had significantly improved post-treatment (p<0.05). The VRGT and the ARGT showed significant improvements in BBS, TUG, and 10MWT scores compared with the control group (p<0.05). The VRGT group showed a significant improvement in BBS, TUG, and 10MWT scores compared with the control group (p<0.05). In addition, it has been confirmed that VRGT had significantly improved in BBS, TUG test, and 10MWT scores compared with the auditory stimulation and control group (p<0.05). Conclusions: The results of this study showed improved balance and gait abilities after VRGT and ARGT groups compared with general physical therapy and was found to be effective in enhancing the functional activity of persons affected with stroke.

• Journal of the Korean Society of Industry Convergence
• /
• v.4 no.4
• /
• pp.371-378
• /
• 2001

This paper proposes a method to detect the misfired cylinder using a new misfire detection index. The new method of misfired cylinder is a comparison of pressure gradient during the blowdown period of exhaust stroke. If a misfire occurs, the engine will he lost some power and consumes the more fuel and the torque will be unsteady. Most of all, the misfire affects a bad influence of the 3-way catalyst and emits unburned hydrocarbon in the air. To prevent these unusual phenomena and eliminate the factor of the environmental pollution, it is important to detect the misfired cylinder. To do the experiment, set up the assist device on the manifold. This assist device is not deformed for conventional exhaust manifold and installed in the end of the exhaust manifold. Experimental results showed that the method using the mean gradient pressure index is proven to be effective in the detection of misfired cylinder on gasoline engine regardless loads and revolutions of the engine.

• Proceedings of the KOSOMBE Conference
• /
• v.1998 no.11
• /
• pp.235-236
• /
• 1998

The purpose of this paper is to develop diaphragm type pneumatic Left Ventricular Assist Device(LVAD) for clinical application and to evaluate its performance through the mock circulation and animal experiment. The blood housing and diaphragm are made by polyurethane. The relations of cardiac output us. beat rate and cardiac output vs. systolic-to-diastolic rate was estimated through the mock test and hemodynamic waves are recorded for the evaluation of VAD. We performed animal experiment and 4 animals survived more than 24hrs. As a result, the hemodynamic data and waves showed this system can be applicable to the animal experiment.

• Proceedings of the KOSOMBE Conference
• /
• v.1995 no.05
• /
• pp.247-250
• /
• 1995

The purpose of this paper is to develop diaphragm-type pneumatic ventricular assist device(VAD) for clinical application and to evaluate its performance through the mock circulation system. The blood housing and diaphragm are made by coating pellethane on the metallic mold and the back plate is made by machining process. The relations of cardiac output(CO) vs. beat rate and CO vs. systolic-to-diastolic rate was estimated through the mock test and hemodynamic waves are recorded for the evaluation of VAD. As a result, the volume of blood pump is 70 ml, maximum CO is 5 L/min and CO has a close relation to the input resistance of blood pump. The hemodynamic data and waves showed this system can be applicable to the animal experiment.

• Journal of radiological science and technology
• /
• v.43 no.4
• /
• pp.243-249
• /
• 2020

Examination with medical radiography is the most significant advances in medicine in the 21st century. Diagnostic imaging occupies an important position in all medical subjects, surgical and internal medicine, including radiology, orthopedics, and neurosurgery. However, the invention associated with conventional radiography devices has focused only on emphasizing the efficient aspects of the examination or obtaining clearer images without considering the age and disease-induced constraints of the patient's posture. The newly developed X-ray aids to solve this problem can effectively perform X-ray imaging of children's who have difficulty communicating and controlling. It is also thought to be a good way to provide accurate imaging information and minimize radiation exposure for children.