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박대근,정원경,정두원,백종은,이진욱,Park, Daegeun,Jung, Wonkyong,Jeong, Doowon,Baek, Jongeun,Lee, Jinwook 응용생태공학회 2016 Ecology and resilient infrastructure Vol.3 No.2
급속한 산업화가 진행되면서 건물과 인공 포장된 도로의 급격한 증가하고 있다. 이로 인한 도심 집중강우에 따른 도로침수, 포장체 파손 등이 발생하고 있다. 이에 대한 해결책으로 도심지 내 투수성 포장의 필요성이 대두되고 있다. 본 연구는 투수블록의 차도포장 적용 가능성 현장 평가를 하기 위하여 공용기간 동안 차도용 투수블록의 투수성능을 평가하였다. 평가결과 줄눈재 및 받침안전층은 품질관리기준을 만족하였으며 휨강도는 1개소만이 5.29 MPa로 기준을 만족하였다. 실내투수지속성시험의 결과는 4개 제품중 1등급 1개, 2등급 1개, 3등급 2개로 평가되었으며 현장투수 및 현장 침투능은 각 제품의 9개월 간의 추적 조사 결과 1개 제품을 제외한 모든 제품에서 0.1 mm/s 이상의 품질기준을 만족하였다. The rapid expansion of buildings and paved roads increases the risk of flood disaster in an urban area. One of the solutions can be the use of permeable pavements. This study evaluated the permeability of permeable blocks used for the roadway pavement. Joint fillers and mat sands of the investigated blocks met the corresponding standards. The flexural strength of the blocks was 5.29 MPa to meet these standards. Based on interior permeability test results after pollution, the four products evaluated were categorized into the following three levels: One for the $1^{st}$ level, one for the $2^{nd}$ level and two for the $3^{rd}$ level. From the field permeability test and pervious concrete infiltration test results nine months after their construction, all the products except one passed the quality standards of 0.1 mm/s.
토크 제어를 위한 Sensor-less 페달형 재활 기구 개발
박대근(Daegeun Park),김종우(Jongwoo Kim),송대섭(Dae-Seob Song),조규진(Kyu-Jin Cho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
For rehabilitation, there are many kinds of devices such as the constant passive motion (CPM) and the pedal type rehabilitation device. Of these devices, the pedal type devices are most used widely. However, these devices need improvements because the force control which is important for safety isn’t applied in this simple controlled system. Some companies try to develop the force control mode by using the force/torque (F/T) sensor in the pedal type device. However, the high cost of the sensor interrupt the commercialization of the devices. In this paper, we develop the pedal type rehabilitation system which consist of the motor and the worm gear without any F/T sensors. To control the torque of this system without F/T sensor, we made the test bed which consist of the motor system and rotational torque sensor. Then we analyze the relationship between the torque and the current from the test bed and we finally develop the sensor-less torque controlled pedal type device for rehabilitation.
박대근(Daegeun Park),조규진(Kyu-Jin Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Because of several diseases such as muscular dystrophy, stroke, and spinal cord injury, many people have disability on their body and this disability causes low ability of activities of daily life (ADLs). To help these people, lots of devices have been developed to assist the ADLs. However these devices have many challenges in their use in actual life, such as size, weight, costs, and appearance. To solve these challenges, we developed a soft wearable robot based on a tendon-driven mechanism. By using soft materials and tendon-driven mechanism, the device can be compact, light, cheap, and easily customized due to material properties and detachment of an actuation part from body. However, the soft wearable robot also has several challenges. Of these issues, we focus on the pressure on the body. Because the actuation force is applied to the body directly, the actuation force can damage on it. Therefore, the pressure distribution is the most important when designing the wearable part. In this paper, we studied two anchor wire patterns where an actuation wire is attached. Each pattern is designed by changing direction and curvature of the anchor wire, and it wrap a cylindrical pressure measurement system. This pressure measurement system measured the pressure distribution on the anchor when the actuation wire is pulled by a tensile test machine. By using this experimental setup, we evaluated the pressure distribution of each pattern and found dominant design parameters which affect the pressure distribution.
저신장율 대향류화염에서 화염소화에 있어서 천이에 대한 연구
박대근(DaeGeun Park),박정(Jeong Park),김정수(JeongSoo Kim),배대석(Daesuk Bae) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
대향류확산화염에서 수축하는 화염디스크로부터 화염구멍으로 천이에 대한 실험 연구가 수행되었다. 이러한 연구는 버너직경, 전체신장율 그리고 속도비에 따라 묘사된다. 적절히 작은 버너 직경을 사용한 경우 고신장율 화염임에도 반경방향의 전도 열손실의 효과가 기여하는 것을 실험적으로 입증하였다. 그리고 화염소화 모드는 세 가지로 분류되며 특히, 충분히 큰 고신장율 화염의 표면에서 화염구멍 또는 줄무늬로 나타났다. 그리고 버너직경에 따라 화염소화모드를 구분 짓는 임계화염반경이 존재한다. Experiments were conducted to study the transition of shrinking flame disk to flame hole in counterflow diffusion flames. The studies of transition are well described by varying burner diameters, global strain rate and velocity ratio. It is experimentally verified that radial conduction heat loss is affected at even high strain rate flames for appropriately small burner diameters. It is also shown that flame extinction modes are grouped into three and particularly, hole or stripe is observed in sufficiently high strain rate flames. There exists critical radius according to burner diameter which divide flame extinction modes into three parts.