• Journal of Sensor Science and Technology
• /
• v.24 no.3
• /
• pp.208-213
• /
• 2015

The purpose of this study is to optimize the design of a capacitive pressure sensor element using the simulation of electrical characteristics. The simulation of the ceramic sensor diaphragm ($Al_2O_3$) was performed by permitting pressure to change the curvature of the diaphragm. The pressure capacitance ($C_P$) was increased from 19.63 pF to 15.26 pF by applying pressure because the distance between the electrodes has been changed from $30{\mu}m$ to $15{\mu}m$. When the thickness of the diaphragm was changed to 0.46~0.52 mm, a larger capacitance change showed in accordance with the reduced thickness, which means an increase of sensitivity. However, considering the viewpoint of the signal linearity, it was selected for the optimum thickness of the diaphragm to 0.50 mm. The designed sensor element based on simulated results was tested to measure the output characteristics. Comparing of simulated and measured results, there was a margin of error of approximately 2%.

• Journal of Korean Biological Nursing Science
• /
• v.21 no.1
• /
• pp.54-61
• /
• 2019

Purpose: This study aimed to identify the incidence and risks for pressure ulcer among older patients with hip fracture. Methods: The subject were 215 older patients suffering from hip fracture who were admitted for surgical operation from January 1, 2012 to April 30, 2016 in a university-affiliated hospital. The incidence of pressure ulcer was collected retrospectively through medical record review and the risk factors were analyzed using Cox's proportional hazard model. Results: Out of the total, 32 patients (14.9%) developed pressure ulcer with the average occurrence period being 4.72 (${\pm}3.81$) days. Stage II pressure ulcer was the most common at 72.0%. Risk factors included ambulation status before injury (p= .039), spinal anesthesia (p= .029), and stay at intensive care unit after operation (p= .009). Conclusion: Despite pressure ulcer prevention efforts, the incidence remained relatively high. Considering the identified risk factors, more efforts is needed for early detection and prevention of pressure ulcers in such patients.

• The Journal of Korean Medicine
• /
• v.27 no.4
• /
• pp.57-61
• /
• 2006

Objectives : With an assumption of traditional oriental medical theory, to evaluate the effect of tonification/sedation manipulative acupuncture on blood pressure in male normotensives. Methods : This study was a randomized cross-over trial. We enrolled healthy male normotensive subjects, and assigned them randomly to group A or group B. Group A received acupuncture therapy on Shen-Men (He-7) and Nei-Kuan (EH-6) with tonification-manipulation, while group B received it with sedation-manipulation. Blood pressure was assessed every ten minutes for 2 hours. After 3 days of washout period, the subjects were crossed over to the other manipulation, and the same procedures were performed. Results : We observed that blood pressure stimulated by the sedation-manipulation had a tendency to decrease compared to that by the tonification-manipulation. Conclusions : We suggest the sedation manipulation has more synergic effect with the inhibitory effects of Shen-Men and Nei-Kuan on the sympathetic nervous system than the tonification-manipulation.

• Journal of Korean Dental Science
• /
• v.9 no.2
• /
• pp.63-68
• /
• 2016

Pressure root resorption can be observed during the eruption of permanent dentition, especially of the maxillary canines (affecting lateral incisors) and mandibular third molars (affecting mandibular second molars). Since the cause of root resorption of the adjacent affected teeth is evident, treatment simply involves extraction of the impacted tooth. However, there have been few reports on the prognosis of the remaining resorbed tooth, as dentists often choose to extract them when damage due to root resorption is observed. We report a case involving a tooth that was severely resorbed due to pressure from an adjacent impacted tooth. After extraction of the impacted tooth, the remaining tooth retained vital pulp and survived as a functional tooth.

• Journal of International Academy of Physical Therapy Research
• /
• v.9 no.4
• /
• pp.1676-1682
• /
• 2018

The purpose of this study was to investigate the short-term effects of lumbar rotational mobilization under the single-leg standing (SLS) position. Fifteen healthy individuals were recruited, and randomized to agroup of trunk rotational exercise (TRE) and lumbar rotational mobilization (LRM). Trunk twist rotational exercise was performed to the TRE group, and mobilization was applied to the LRM group on the lumbar spine. Velocity of the center of pressure (VCOP) and center of pressure (COP) for each participant were measured through SLS. COPs were not significantly increased or decreased after treatment in both groups. VCOPs also did not change considerably except on the right side when the eye was closed. There was no significant difference between COPs and VCOPs in two groups. This study suggests that trunk rotation exercise and lumbar rotation mobilization would have similar effects on balance ability.

• The Journal of Korean Physical Therapy
• /
• v.23 no.3
• /
• pp.1-5
• /
• 2011

Purpose: This study examined the relationship between the center of pressure (COP) displacement time during the stance phase and dynamic balance ability when older adults cross a 10 cm obstacle. Methods: Fifteen older adults were enrolled in this study (all ${\geq}65$ years of age). The F-scan was used to measure the COP displacement time when subjects cross a 10 cm obstacle, and the Dynamic gait index. Berg's balance scale and the Four square step test were used to measure dynamic balance ability. Results: The Dynamic gait index, Berg's balance scale and the Four square step test were correlated with each other. Dynamic balance ability was correlated with COP displacement time during the stance phase at an obstacle crossing in older adults. Conclusion: People with higher dynamic balance ability show a smaller COP displacement time during the stance phase at an obstacle crossing. Therefore, dynamic balance ability can be predicted by measuring the center of pressure displacement time.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2011.08a
• /
• pp.151-151
• /
• 2011

Atmospheric-pressure plasmas are used in a variety of materials processes. The lifetime of most atmospheric-pressure plasma sources is limits by electrode erosion due to energetic ion bombardment. These drawbacks were solved recently by several microplasma sources based on microstrip structure, which are more efficient and less prone to perturbations than other microplasma sources. In this work, we propose microplasma sources based on strip line and microstrip line, developed for the generation of microplasmas even in atmospheric air and analyzes these systems with microwave field simulation via comparative study with two previous microwave sources (Microstrip Spit Ring Resonator (MSRR), Microstrip Structure Source (MSS)).

• Tribology and Lubricants
• /
• v.24 no.4
• /
• pp.196-204
• /
• 2008

In this study, the pressure distributions on the oil film of piston pin bearings are found by two-dimensional lubrication analysis in order to help the optimum design of the bearings of piston pin. The lubrication analysis is carried out together with an equation related with the oil pressure-viscosity index. The oil film pressure distribution is used as an input data for pressure boundary conditions at the piston pin-boss surface. Finally, the piston pin-boss stress distribution coupled with the thermal stress is calculated, and then compared with the results of the stress analysis which is not counted with the oil film pressure boundary condition.

• Proceedings of the KIEE Conference
• /
• 1999.11d
• /
• pp.1099-1101
• /
• 1999

PJB(Prefabricated Joint Box) is consisted of three major components ; an epoxy unit, a stress relief cone and a spring unit. The insulation structure of PJB is maintained by the interfacial pressure, and the dielectric performance at the interface depends on the interfacial pressure which is regarded as the most important factor for preventing breakdown failure. This experiment was performed to investigate breakdown voltage characteristic and partial discharge patterns under the controlled pressure conditions at the simulated interface. Finally, this paper presents the optimal pressure conditions at the interface by analyasing the PD patterns.

• Journal of Sensor Science and Technology
• /
• v.5 no.2
• /
• pp.1-8
• /
• 1996

In this paper, We have designed silicon pressure sensor with center-bossed diaphragm which improving sensitivity and linearity by reducing diaphragm deflection. Designed center-bossed pressure sensor showed maximum deflection of $0.125{\mu}m$, maximum stress of $2.24{\times}10^7 Pa$ and sensitivity of 27.67 mV/V.psii. As a result, diaphragm deflection was reduced to 1/160 that of diaphragm thickness and 1/35 that of square diaphragm. Also, sensitivity was increased 19 times compared to square diaphragm.