• 한국정밀공학회지
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• 제32권3호
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• pp.285-292
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• 2015

This paper presents a wireless ground reaction force (GRF) sensing system for ambulatory GRF recording. The system is largely divided into three parts: force sensing modules based on optical sensor, outsole type frame, and embedded system for wireless communication. The force sensing module has advantages of the low height, robustness to the moment interference, and stable response in long term use. In simulation study, the strain and stress properties were examined to satisfy the requirements of the GRF sensing system. Four sensing modules were mounted on the toe, ball, and heel of foot shaped frame, respectively. The GRF signals were extracted using Micrpcontroller unit and transferred to the smart phone via Bluetooth communication. We measured the GRF during the normal walking for the validation of the continuous recording capability. The recorded GRF was comparable to the off the shelf stationary force plate.

• The Journal of Korean Physical Therapy
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• 제27권1호
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• pp.24-29
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• 2015

Purpose: The purpose of this study was to investigate the effect of lower limb training using a sliding rehabilitation machine on the foot motion and stability in stroke patients. Methods: Thirty participants were allocated to two groups: Training group (n=15) and Control group (n=15). Subjects in the control group received physical therapy for 30 minutes, five times per week, and those in the training group received lower limb training using a sliding rehabilitation machine for 30 minutes, five times per week, with physical therapy for 30 minutes, five times per week, during a period of six weeks. Heel rotation, hallux stiffness, foot balance, metatarsal load, toe out angle, and subtalar joint flexibility were measured by RS-scan. Results: Significant improvement of the foot motion (hallux stiffness, meta load) and the foot stability (toe out angle, subtalar joint flexibility) was observed in the training group. Conclusion: This study demonstrated that lower limb training using a sliding rehabilitation machine is an effective intervention to improve the foot motion and stability.

• 한국공작기계학회논문집
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• 제16권5호
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• pp.151-156
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• 2007

In this paper, the creep characteristics of lead and lead-free solder joint were investigated using the QFP(Quad Flat Package) creep test. Two kind of solder pastes(Sn-3Ag-0.5Cu, Sn-0.2Sb-0.4Ag-37.4Pb) were applied to the QFP solder joints and each specimen was checked the external and internal failures(i.e., wetting failure, void, pin hole, poor-heel fillet) by digital microscope and X-ray inspection. The creep test was conducted at the temperatures of $100^{\circ}C$ and $130^{\circ}C$ under the load of 15$\sim$20% of average pull strength in solder joints. The creep characteristics of each solder joints were compared using the creep strain-time curve and creep strain rate-stress curves. Through the comparison, the Sn-3Ag-0.5Cu solder joints have higher creep resistance than that of Sn-0.3Sb-0.4Ag-37.4Pb. Also, the grain boundary sliding in the fracture surface and the necking of solder joint were observed by FE-SEM.

• Structural Engineering and Mechanics
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• 제74권5호
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• pp.711-722
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• 2020

In this study, on-site testing was carried out to investigate the vibration serviceability of a composite steel-bar truss slab with steel girder system. Impulse excitations (heel-drop and jumping) and steady-state motion (walking and running) were performed to capture the primary vibration parameters (natural frequency and damping ratio) and distribution of peak acceleration. The composite floor possesses low frequency (<8.3Hz) and damping ratio (<2.47%). Based on experimental, theoretical, and numerical analyses on fundamental natural frequency, the boundary condition of SCSS (i.e., three edges simply supported and one edge clamped) is deemed more comparable substitutive for the investigated composite floor. Walking and running excitations by one person (single excitation) were considered to evaluate the vibration serviceability of the composite floor. The measured acceleration results show a satisfactory vibration perceptibility. For design convenience and safety, a crest factor β_rp describing the ratio of peak acceleration to root-mean-square acceleration induced from the walking and running excitations is proposed. The comparisons of the modal parameters determined by walking and running tests reveal the interaction effect between the human excitation and the composite floor.

• Journal of Yeungnam Medical Science
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• 제21권2호
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• pp.256-261
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• 2004

유잉육종은 소아와 청소년기에 발생하는 악성 골종양으로 주로 긴 뼈의 골간에 발생한다. 손과 발에 발생하는 유잉육종은 매우 드물다. 저자들은 왼쪽 발꿈치뼈에 발생한 유잉육종 1예를 경험하였기에 문헌 고찰과 함께 보고한다. 15세 여자가 왼쪽 발꿈치의 동통과 부종을 을 주소로 내원하였다. 방사선 소견에서 왼쪽 발꿈치뼈에 골용해성 및 골경화성 병변이 관찰되었다 수술 전 시행한 생검에서 종양세포들은 균일한 둥근 모양의 종양세포로 구성되어있었다. CD99에 대한 면역조직화학염색에서 대부분의 종양세포의 세포질이 강한 양성반응을 보였다. 유잉육종으로 진단을 하고 화학요법을 한 후 무릎밑절단을 시행하였다.

• 혜화의학회지
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• 제13권1호
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• pp.287-293
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• 2004

Objective : The purpose of this study is to examine the clinical effect of Auricular Acupuncture therapy on ankle sprain Methods : This study was carried out on the 48 patients who had been treated at chonan oriental hospital from December 1st, 2003 to April 30th, 2004. 48 patients had a diagnosis of ankle sprain by x-ray or physical test. we treated 48 patients by Auricular Acupuncture therapy. Results and Conclusions 1. We operated Auricular Acupuncture on the foot point(발점), the ankle point(발목점), the heel point(발뒤꿈치점), the zero point(제로점)and the thalamus point(시상점). 2. The efficacy of Auricular Acupuncture therapy was 75% when we set a standard thing more than good(良好) 3. The Auricular Acupuncture therapy is effective of ankle sprain patients, but we thought that it needed to prove effect of Auricular Acupuncture therapy for efficient application by more clinical researches.

• 한국지진공학회논문집
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• 제7권1호
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• pp.65-72
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• 2003

이 연구의 목적은 무리보행하중을 받는 구조물의 주요 지점에 대한 응답을 계측하고 분석하여 하중의 특성을 파악하는 것이다. 이를 위하여 먼저 건축구조물의 동특성을 파악하였으며 이를 바탕으로 무리보행하중의 주파수 특성을 파악할 수 있는 식을 유도하였다. 그리고, 단위보행하중의 주파수 특성을 바탕으로 무리보행하중의 크기를 평가할 수 있는 방법을 제안하였다. 유도된 식은 무리보행하중의 진동수 및 크기를 잘 나타내었으며, 단위보행하중을 기준으로 한 무리보행하중의 크기를 평가하는 경우에는 고차모드형상을 포함하여야 좋은 결과를 얻을 수 있는 것으로 나타났다.

• Archives of Reconstructive Microsurgery
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• 제12권2호
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• pp.112-118
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• 2003

Purpose : Soft tissue defect and exposed tendons and bones with concomitant infection in the foot and lower leg have to be covered with vascularized flap as the one stage treatment. Authors have performed 6 cases of pedicled dorsalis pedis island flaps under the loupes magnification and evaluated the benefits. Materials and methods : From 1994 through 2003, we have performed 6 pedicled dorsalis pedis island flaps for reconstruction of soft tissue defects in the foot and lower leg. The causes were trauma in 3 cases, skin necrosis and secondary infection after Achilles tendon repair in 2 cases and acute osteomyelitis in 1 case. Average age was 38 years and 5 cases were male and 1 female. The results of the procedure was evaluated by survival of the island flap, comfort in putting on shoes and walking, comfort in the donor site, comfort in the recipient site and range of motion of the ankle joint. Results : All pedicled dorsalis pedis island flaps survived except 1. Three cases felt discomfort in the dorsum of foot as the donor site and 1 case of the Achilles tendon ruptured and repaired showed limited dorsiflexion of ankle joint. Conclusion : Nonmicrosurgical pedicled dorsalis pedis island flaps under the loupes magnification are one of the useful treatment methods because procedure is rapid, survival is confident and overall reconstructive results are good.

• Archives of Reconstructive Microsurgery
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• 제12권2호
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• pp.119-124
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• 2003

Introduction : The purpose is a retrospective evaluation of the clinical results of the radial forearm flap transfer for foot reconstruction. Materials and methods : We evaluated 21 cases with medical records including etiology, wound dimension, presence of infection, associated fracture, ischemic time of free flap, complication of donor and recipient site. The final results were evaluated with our clinical score (walking, shoe-in, cosmetic). Results : Defects were located on the heel (12 cases), dorsum of foot (4 cases) and sole (5 cases). Mean wound dimension was $7.56{\times}6.0cm$, and mean ischemic time of free flap was 94.5minute. There were superficial skin necrosis (1 case), recurrent ulceration (2 cases) in recipient site, and no complication in donor site but complaint about cosmetic problem (3 cases). The clinical score showed excellent in 14 cases, good in 4 cases, fair in 1 case and poor in 2 cases. Conclusion : We consider the radial forearm flap could provid the stable and durable restoration of normal foot contour without debulking in the foot reconstruction and achieved normal ambulation and cosmetic satisfaction.

• Archives of Plastic Surgery
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• 제33권2호
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• pp.187-192
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• 2006

The perforator flaps are based on cutaneous vessels which are originated from a main pedicle and penetrate fascia or muscle to reach the skin. The lateral lower leg is one of the most suitable areas for harvesting perforator flaps because a number of perforator vessels exist. The authors applied peroneal perforator flaps in nine patients. Five flaps were reverse island flaps based on peroneal artery and septocutaneous perforator, and four flaps were free flap based on musculocutaneous perforator only. The recipient site was the posterior ankle in three patients, posterior heel in three patients, lateral malleolus, anterolateral ankle, and foot dorsum in one patient each. The flap size ranged from 5 to 12cm long, from 3 to 5cm wide, and the primary closure of the donor site was possible in most cases. All flaps, except for the flap in two patients in the reverse island flap series, survived completely. The peroneal perforator flap is a very thin, pliable flap with minimal donor site morbidity and is suitable for the reconstruction of small and medium sized superficial skin defects. Also, this flap may be considered as an alternative to radial forearm flap or other perforator flaps.