족근 골 결합의 수술적 치료

박용욱,윤태경,정운섭,Park, Yong-Wook,Yoon, Tae-Kyung,Jeong, Un-Seob 대한족부족관절학회 2003 대한족부족관절학회지 Vol.7 No.1

Purpose: The purpose of this study was to evaluate the results of surgical treatments for tarsal coalitions. Materials and Methods: A retrospective study was conducted between October 1995 and September 2002. Four cases of talocalcaneal coalitions and two cases of calcaneonavicular coalitions were included. We did bone excision for three cases of talocalcaneal coalitions and two cases of calcaneonavicular coalitions. In one case of talocalcaneal coalition, we did subtalar fusion. Follow-up averaged 43 months. We evaluated both the patients' satisfaction rates by Mann and Reynolds scorring and compared the radiographic results between preoperative and final radiography. Results: The satisfaction outcomes at the last follow-up were two excellent and two good in talocalcaneal coalitions and all excellent in calcaneonavicular coalitions. Two cases of talocalcaneal coalition who did excision of coalition complained mild pain in hindfoot, however, symptoms improved than preoperation. In calcaneonavicular coalition, pain is subsided at mean post-operative 13 weeks. During follow-up period, there were no radiographic changes and recurrence in all cases. Conclusion: In small cases, we think the cause of subsidence of symptoms maybe reconstruction of normal joint motion after excision of tarsal coalition. But, we try to warn the patients with talocalcaneal coalition that the symptom may not be completely subsided after the excision of coalitions.

제1 중족골 근위 반월형 절골술과 Ludloff 절골술 후 교정 각도에 따른 절골편간 접촉 면적 비교(예비보고)

박용욱,장근종,박상호,Park, Yong-Wook,Jang, Keun-Jong,Park, Sang-Ho 대한족부족관절학회 2010 대한족부족관절학회지 Vol.14 No.1

Purpose: This study was performed to compare the contact area between three different correcting angles after the proximal crescentic and Ludloff osteotomies of the first metatarsal. Materials and Methods: We used the two sawbone models. Proximal crescentic (PCO) and Ludloff osteotomies (LO) were performed and secured using K-wires under the correcting intermetatarsal angle (IMA) $5^{\circ}$, $10^{\circ}$, and $15^{\circ}$. Then each 6 osteotomized model was scanned five times and measured the contact area using the calculating program. We excluded the highest and lowest values. Results: The mean area of cutting surface was 189 $mm^2$ in PCO, 863 $mm^2$ in LO. The mean contact area (contact ratio; contact area $\times$100/area of cutting surface) of PCO was 149 $mm^2$ (79%) in $5^{\circ}$, 139.5 $mm^2$ (74%) in $10^{\circ}$, 107 $mm^2$ (57%) in $15^{\circ}$ IMA. The mean contact area (contact ratio) of LO was 711 $mm^2$ (82%) in $5^{\circ}$, 535.5 $mm^2$ (62%) in $10^{\circ}$, 330 $mm^2$ (38%) in $15^{\circ}$ IMA. Conclusion: A significant decrease in the contact area and contact ratio according to increase in correcting IMA was noticed in LO. We recommend the PCO rather than LO, when the IMA is needed to correct over $15^{\circ}$.

족관절 골관절염에서 히알루론산 관절 내 주사

박용욱,Park, Yong-Wook 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.3

족관절 내 히알루론산 주사 후 효과에 대한 참고 자료를 살펴 본 결과 대부분의 연구들이 족관절 내 히알루론산 주사에 대한 효과와 안전에 대해 긍정적으로 보고하고 있지만, 아직까지는 결론을 짓기는 어렵다고 하겠다. 추후 많은 환자를 대상으로 한 무작위 이중맹검 위약대조군 연구(randomized double-blind placebo-controlled trials)를 통해 그 결과를 평가해야 할 것으로 사료되며, 또한 장기 추시를 통해 효과 발현 시기 및 지속 기간을 평가해야 할 것이다. Treatment of osteoarthritis of the ankle joint is similar to that of any other large joint and includes conservative and surgical treatments. Surgical option in severe osteoarthritis is joint fusion or joint replacement, whereas conservative treatment is limited and includes mainly ankle supports, physical therapy, and oral medication. Hyaluronic acid was discovered in 1934 and now has been widely used in the knee and shoulder joints. We reviewed the articles about an intra-articular hyaluronic acid injection in the treatment of osteoarthritis of the ankle joint.

족근 골 결합

박용욱,서일우,Park, Yong-Wook,Seo, Il-Woo 대한족부족관절학회 2012 대한족부족관절학회지 Vol.16 No.3

A tarsal coalition is an abnormal union between 2 or more tarsal bones of the hind- and midfoot, which can be congenital or acquired. The documented overall incidence of tarsal coalition is 1% or less. The resulting abnormal articulation leads to accelerated degeneration within adjacent joint. Pain is often diffuse, exacerbated by strenuous activity or following an ankle sprain. The findings on physical examination is protruded mass, diminished range of motion of the involved joint. It is possible to identify of tarsal coalitions with conventional radiography, but CT scanning necessary to evaluate of the size, location, characteristic and preoperative planning of tarsal coalitions. The initial treatment for a tarsal coalition is conservative, but tarsal coalitions unresponsive to conservative treatment, are managed by coalition resection, or arthrodesis in case of presence of degenerative changes.

S-DMB 수신용 마이크로스트립 안테나의 연구

박용욱,Park, Yong-Wook 한국전자통신학회 2009 한국전자통신학회 논문지 Vol.4 No.2

본 연구에서는 S-DMB(2.63~2.65GHz)용 마이크로스트립 안테나를 연구하였다. 설계된 안테나는 마이크로스트립 패치 중앙에 대각선 슬롯을 가지는 형태로 HFSS으로 최적화한 후 비유전율이 4.4인 FR4_epoxy(기판두께 = 1.6mm, Metal두께 = $17{\mu}m$, 0.5 oz. copper)을 사용하여 제작하고 특성을 평가 분석하였다. In this paper, we have studied on the microstrip antenna for satellite DMB from 2.63 to 2.65 GHz. Microstrip patch antenna was designed using HFSS simulation program and fabricated by FR4 substrate that has substrate thickness of 1.6mm, metal thickness of $17{\mu}m$, and dielectric constant of 4.4, respectively.

수위관리 시스템 연구

박용욱,Park, Yong-Wook 한국전자통신학회 2010 한국전자통신학회 논문지 Vol.5 No.5

현 농촌사회는 점차 고령화 사회가 되어감에 따라 노동력 감소 문제점이 발생하고 있다. 본 연구을 통하여 생육 단계별 수위를 자동 컨트롤하여 관리할 수 있는 농작물의 수위 조절 시스템 연구 개발하였다. 수위측정에는 초음파 센서를, 급 배수로의 수문 제어에는 서보모터를 사용하고 이들의 신호를 처리하는 제어부로는 ATmega128을 사용하였다. 본 시스템을 통하여 노동력 감소의 문제점을 해결하고 농촌사회의 자동화 발전 및 고령화 사회에 큰 기여를 기대 할 수 있을 것이다. A reducing labor is a big issue in rural community due to a increasingly aging society. In this paper, the water control system for corps production with a function of automatically controls and solar energy system is developed. The water level was measured by ultrasonic sensor and water gate was controlled by using servo motor. The system had included ATmega 128 control unit for signal controls. The water level control system will be able to contribute to the aging rural society.

신경 차단 마취를 이용한 족부 및 족근 관절 수술

박용욱,정영기,유정한,전득수,전진호,Park, Yong-Wook,Chung, Yung-Khee,Yoo, Jung-Han,Jun, Deuk-Soo,Chun, Jin-Ho 대한족부족관절학회 1999 대한족부족관절학회지 Vol.3 No.1

We present our experience with the use of nerve block anesthesia in 212 of 484(43.8% ) surgical procedures of the foot and ankle between 1995 and 1997. Nerve block anesthesia was used for surgical procedures of the forefoot, midfoot, hindfoot, and ankle in the setting of elective surgery and trauma. From the viewpoint of the surgeon, nerve block anesthesia was completely successful in 99.5% of the procedures performed. We confirmed that 80% of patients were satisfied with the use of nerve block anesthesia for their operative procedure. There were only one(0.5%) miner complication being toxic neuritis of posterior tibial nerve. With increasing experience, the expanded indications and uses of nerve block anesthesia for foot and ankle surgery are proving to be simple, safe, reliable, and well tolerated by the patient.

크리소스포리움 안내염 1예

박용욱,최병룡,신재필,조희태,Yong Wook Park,M,D,Byung Ryong Choi,M,D,Jae Pil Shin M,D,Hee Tae Cho,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.5

Purpose: To report a case of Chrysosporium parvum endophthalmitis after trauma. Methods: A 42-year-old healthy woman visited our hospital complaining of ocular pain after trauma sustained with a wire used to tie grapes. She showed corneal laceration and iris prolapse of the right eye on slit lamp examination. She underwent primary suture of the corneal laceration. Two days later, she presented with hypopyon of the anterior chamber. She was treated with topical antibiotics and a topical steroid. On follow-up examination, she again presented with hypopyon of the anterior chamber. She was admitted for microbiologic examination and was again treated with topical antibiotics and a topical steroid. Unfortunately, no organisms were identified by culture. Later, she reported a recurrent history of the inflammation. After 9 months, she presented with increased hypopyon of the anterior chamber and was treated with anterior chamber irrigation and intracameral antibiotics injection on two different occasions. But, still no organisams were identified. After one year, the patient visited our clinic with ocular pain and decreased visual acuity. Her intraocular pressure was 72 mmHg and there was whitish infiltration and hypopyon around 360 degrees of the anterior chamber and angle. At the same time, the intraocular pressure and inflammation were uncontrolled. Ultimately, microscopic examination of specimens obtained directly from tissue after enucleation identified the organism as Chrysosporium parvum. Conclusions: We experienced a case of Chrysosporium parvum endophthalmitis after trauma. To our knowledge, this was the first report of a case of Chrysosporium parvum endophthalmitis in the world.

2.64GHz S-DMB용 패치 안테나 설계

박용욱,Park, Yong-Wook 한국컴퓨터산업학회 2009 컴퓨터産業敎育學會論文誌 Vol.10 No.4

본 연구에서는 중심주파수 2.64GHz로 S-DMB에 사용 가능한 패치 안테나를 연구하였다. 패치 안테나의 특성은 Ansoft사의 HFSS(High Frequency Structural Simulator)을 사용하여 안테나의 특성을 분석하였고, 설계된 안테나는 사진 식각술을 이용하여 FR-4 기판으로 제작하였다. 최적의 동작특성을 갖는 안테나를 설계하기 위해 패치의 크기, 급전선의 길이 및 메탈두께 등의 설계변수를 변화시키며 안테나 특성을 분석하였다. In this paper, the patch antenna for 2.64GHz S-DMB applications has been studied. The patch antenna was designed by HFSS (High Frequency Structural Simulator) program and the optimized antenna was fabricated using photolithography method on the FR-4 substrate. To find optimal conditions of microstrip patch antenna, design parameters with different patch size, length of feedline and metal thickness were analyzed.

UHF 대역용 마이크로 스트립 안테나 특성

박용욱,Park, Yong-Wook 한국컴퓨터산업학회 2008 컴퓨터産業敎育學會論文誌 Vol.9 No.5

본 논문에서는 UHF 대역용 마이크로 스트립 구조의 안테나 특성을 연구하였다. HFSS 시뮬레이터를 이용하여 설계된 안테나는 마이크로스트립 구조의 접지(ground)에 슬롯(slot)을 이용한 구조로 비유전율이 4.4인 FR4_epoxy 기판(두께 = 1.6mm)을 사용하여 안테나를 제작한 후 그 특성 등을 비교, 분석하였다. The characteristics of UHF antenna with microstrip structure was studied. Design parameters as center frequency, band width, and VSWR by slot length, stub was analyzed by HFSS simulator. UHF antenna with microstrip structure was fabricated using FR4_epoxy substrate of 4.4 dielectric constant.