• 대한정형외과스포츠의학회지
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• 제8권2호
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• pp.89-94
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• 2009

목적: 내측 반월상 연골판 후각부 파열 치료 결과에 영향을 미치는 요인들에 대해 알아보고자 한다. 대상 및 방법: 내측 반월상 연골 후각부 파열로 진단받고, 관절경적 시술을 받은 47명을 대상으로 하였다. 환자의 연령, 대퇴경골각, 골주사 검사 결과, 수술 방법 및 파열 양상에 따른 술후 임상적 결과를 Lysholm 및 Tegner 활동 점수를 이용하여 평가하였다. 결과: 환자의 나이는 수술 결과에 영향이 없으며, 술전 외반 4도 이상의 대퇴경골각을 가지거나, 술전 방사성 동위 원소 검사에서 정상 소견을 보이는 경우 좋은 예후를 기대할 수 있었다. 수술 방법의 차이, 즉 반월상 연골판 제거술 혹은 봉합술 여부에 따른 치료 결과의 통계적 차이는 없으며, 파열 양상에 따른 결과 차이 또한 통계적 의의는 없었다. 결론: 내측 반월상 연골판 파열의 치료에 있어 만족한 결과를 얻기 위해 다양한 요인들을 고려해야 하며, 특히 술전 시행한 골주사 검사는 반월상 연골판 파열부 및 그 주변 골, 연골의 상태를 반영하여 술후 예후를 예측할 수 있는 좋은 평가 방법으로 사료된다.

• 척추신경추나의학회지
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• 제15권2호
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• pp.55-62
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• 2020

연구 목적 이 연구는 내측 반월상 연골판 손상으로 인한 무릎 통증을 호소하는 5명의 환자에서 한의학적 치료, 특히 신바로 약침으로 인한 통증 개선이 있었기에 보고함이다. 연구 방법 무릎 통증으로 본원 입원치료를 받은 환자 중, MRI 영상 검사상 내측 반월상 연골 파열 진단을 받은 환자들의 차트를 분석하였다. 슬관절 통증 호전 및 기능 개선은 Numeric Rating Scale (NRS), Western Ontario and McMaster Universities Arthritis Index (WOMAC Index), 슬관절 Range Of Motion(ROM) 및 special tests 측정으로 판단하였다. 연구 결과 5증례에서 NRS는 평균 3.4의 호전, WOMAC Index는 평균 64.4%의 호전을 보였다. 슬관절 ROM 측정에서 환자 모두 입원시보다 증가되었으나, 무릎에 손상에 사용되는 보편적 검사인 Stress valgus, Stress varus, Drawer test, Apley compression test, Mcmurray's test 상 전후비교에서 4명의 환자는 호전되었고, 1명 환자에서는 변화가 없었다. 결과 이 연구는 내측 반월상 연골판 손상에 대한 신바로 약침을 포함한 한의학적 치료 후 단기간 내 통증 및 기능 향상을 보여주었다.

• 한국정밀공학회지
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• 제25권9호
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• pp.116-125
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• 2008

Inkjet printing technology with a drop-on-demand (DOD) inkget head technology has been recognized as one of versatile and low cost manufacturing tools in the electronics industry. Concerned with control of driving signal, however, general strategy to optimize jetting stability has not been understood well, because of the inherent complex multi-physics nature in inkjet phenomena. Motivated by this, present study investigates the effect of driving waveforms of piezoelectric head on jetting characteristics of DOD inkjet system focused on jetting stability with phase matching of pressure waves in the print head. The results show that velocities and volumes of the ink jetted droplets were linear relations with the driving signal's maximum voltage, while periodic behaviors are observed with the driving signal's pulse widths.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1444-1449
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• 2007

Inkjet printing technology with a drop-on-demand (DOD) inkjet head technology has been recognized as one of versatile and low cost manufacturing tools in the electronics industry. Concerned with control of driving signal, however, general strategy to optimize jetting stability has not been understood well, because of the inherent complex multi-physics nature in inkjet phenomena. Motivated by this, present study investigates the effect of driving waveforms of piezoelectric head on jetting characteristics of DOD inkjet system focused on jetting stability with phase matching of pressure waves in the print head. The results show that velocities and volumes of the ink jetted droplets were linear relations with the driving signal's maximum voltage, while periodic behaviors are observed with the driving signal's pulse widths.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.671-674
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• 2008

We investigate the slippage effect in a micro-channel depending on the surface characteristics; hydrophilic, hydrophobic, and super-hydrophobic wettabilities. The micro-scale grooves are fabricated on the vertical wall to make the super-hydrophobic surfaces, which enable us visualize the flow fields near walls and directly measure the slip length. Velocity profiles are measured using micro-particle image velocimetry (Micro-PIV) and compared those in the hydrophilic glass, hydrophobic PDMS, and super-hydrophobic PDMS micro-channels. To directly measure the velocity in the super-hydrophobic micro-channel, the transverse groove structures are fabricated on the vertical wall in the micro-channel. The velocity profile near the wall shows larger slip length and, if the groove structure is high and wide, the liquid meniscus forms curves into the valley so that the wavy flow is created after the grooves.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1747-1751
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• 2008

Electrohydrodynamic jet printing (EHDP) technique is widely used for the direct writing. However, in the existing EHDP method, the printing characteristics are affected by the printing substrate used, and the line width of the printed is determined by the geometry of the nozzle. We propose an EHDP method which is capable of (1) removing the effect from the substrate, and (2) controlling the line width through the ON/OFF control of the each nozzle in the nozzle array. Printing characteristics of our EHDP system were examined and successful ON/OFF control of the nozzle array were demonstrated. By using the proposed EHDP, it is expected that stable meniscus regardless of the substrate and different line widths even using the same nozzle can be achieved.

• 한국정밀공학회지
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• 제33권3호
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• pp.217-223
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• 2016

In this paper, the movement of a liquid metal droplet in a channel by continuous electrowetting effect is analyzed. The channel is fabricated using two glass substrates and silicone rubber as spacers, and a mercury droplet and dilute sulfuric acid are added into the channel. The droplet is moved according to voltage applied at both ends of the channel through an electrolyte. According to the shape of the droplet and the applied voltage, the velocity of the droplet is changed. The velocity is proportional to the applied voltage and inversely proportional to the length of the droplet, both theoretically and experimentally. Contact angle hysteresis and a meniscus change were also found in the moving state. This implies the existence of a threshold in movement by Laplace pressure difference. The experiment indicated that the sliding angle was inversely proportional to the width of the droplet but that the voltage threshold was proportional to the width.

• Journal of Acupuncture Research
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• 제32권2호
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• pp.197-207
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• 2015

Objectives : The purpose of this study is to report the effect of Korean medical treatment on 4 patients with acute traumatic meniscal tear, presenting severe knee pain and limitation of range of motion of the knee joint. Methods : 4 patients with acute traumatic meniscal tear had been treated with acupuncture, herbal treatment, moxibustion, and wet-cupping therapy. From administration to discharge, we recorded subjective pain by using a visual analogue scale and by measuring the range of motion of the knee joint once per week. Results : The visual analogue scale of knee pain of all 4 cases reduced to 0 after treatment. The range of motion of the knee joint also increased considerably after treatment. Conclusions : In this study, Korean medical treatment may have been effective in reducing knee pain and increasing the range of motion of the knee joint.

• JSTS:Journal of Semiconductor Technology and Science
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• 제8권2호
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• pp.121-127
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• 2008

This paper presents design and fabrication of optimized geometry structure of electrostatic inkjet head. In order to verify effect of geometry shape, we simulate electric field intensity according to the head structure. The electric field strength increases linearly with increasing height of the micro nozzle. As the nozzle diameter decreases, the electric field along the periphery of the meniscus can be more concentrated. We design and fabricate the electrostatic inkjet heads, hole type and pole type, with optimized structure. It was fabricated using thick-thermal oxidation and silicon micromachining technique such as the deep reactive ion etching (DRIE) and chemical wet etching process. It is verified experimentally that the use of the MEMS inkjet head allows a stable and sustainable micro-dripping mode of droplet ejection. A stable micro dripping mode of ejection is observed under the voltages 2.5 kV and droplet diameter is $10\;{\mu}m$.

• 센서학회지
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• 제22권3호
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• pp.207-211
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• 2013

In this research, the pH sensor was developed using CNT nanosheet with Nafion coating for the advanced medical sensor such as a blood gas analyzer. The CNT nanosheet was formed by dielectrophoresis and water-meniscus between cantilever-type electrodes. Then, the process of the heat annealing and the Nafion coating was conducted for reducing contact resistance and giving proton selectivity respectively. We measured the response of the pH sensor as the electrolyte-gated CNT-nanosheet field effect transistor. The sensor showed a linear current ratio in a similar range of the normal blood pH. A calibration method for decreasing of the response variation among sensors has also been introduced. Coefficient of variance of the pH sensor was decreased by applying the calibration method. A linear relation between the calibrated response of the sensors and pH variance was also obtained. Finally, the pH sensor with a high resolution was fabricated and we verify the feasibility of the sensor by applying the calibration method.