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간호대학생, 119 구급대원, 기계식 흉부압박기의 각 그룹이 평지 및 이송중인 구급차에서 실시한 흉부압박의 질 비교
최용준,박대성,최용준,이원석,하원선,정준영 대한응급의학회 2009 대한응급의학회지 Vol.20 No.4
Purpose: In an emergency, the quality of CPR prior to hospital arrival is a very important component for the survival of victims. We want to know differences in chest compression quality performed by groups that have variant experiences of CPR, and automatic CPR machine on the floor, or in an ambulance moving at 40 km/hr, or at 80 km/hr. Methods: We analysed the chest compression quality of each group, and that performed on the floor, in an ambulance moving as 40 km/hr, and at 80 km/hr. We measured the following factors: mean compression depth; mean compression rate; exact performance percentile; and the compression error through too deep, too weak, wrong compression location, and no full recoil. Results: In the student-nurse group, the quality of chest compression performed on the floor was better than that performed in a moving ambulance. In 119 member group, chest compression performed in an ambulance moving as 40 km/hr was better than that performed in an ambulance moving at 80 km/hr. The use of an automatic CPR machine, there were no differences in chest compression quality in all circumstances. In comparing each group, compression quality of the 119 member group and the automatic CPR machine group was better than that of the student nurses. Conclusion: In the group with real CPR experience, there were no differences between chest compression performed on the floor and that performed moving at 40 km/hr. Chest compression performed moving as 40 km/hr is better than that performed moving at 80km/hr. In the group without CPR experience, chest compression performed on the floor is better than that performed in a moving ambulance.
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역삼투-압력지연삼투 조합공정 공정모사 및 비용예측 프로그램 개발
최용준,신용현,이상호,김승현 대한상하수도학회 2016 상하수도학회지 Vol.30 No.3
The main objective of this paper is to develop computer simulation program for performance evaluation and cost estimation of a reverse osmosis (RO) and pressure-retarded osmosis (PRO) hybrid process to propose guidelines for its economic competitiveness use in the field. A solution-diffusion model modified with film theory and a simple cost model was applied to the simulation program. Using the simulation program, the effects of various factors, including the Operating conditions, membrane properties, and cost parameters on the RO and RO-PRO hybrid process performance and cost were examined. The simulation results showed that the RO-PRO hybrid process can be economically competitive with the RO process when electricity cost is more than 0.2 $/kWh, the PRO membrane cost is same as RO membrane cost, the power density is more than 8 W/m2 and PRO recovery is same as 1/(1-RO recovery).
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Updates on Paget’s Disease of Bone
최용준,Young Bae Sohn,정윤석 대한내분비학회 2022 Endocrinology and metabolism Vol.37 No.5
Paget’s disease of the bone is a prevalent bone disease characterized by disorganized bone remodeling; however, it is comparatively uncommon in East Asian countries, including China, Japan, and Korea. The exact cause still remains unknown. In genetically susceptible individuals, environmental triggers such as paramyxoviral infections are likely to cause the disease. Increased osteoclast activity results in increased bone resorption, which attracts osteoblasts and generates new bone matrix. Fast bone resorption and formation lead to the development of disorganized bone tissue. Increasing serum alkaline phosphatase or unique radiographic lesions may serve as the diagnostic indicators. Common symptoms include bone pain, bowing of the long bones, an enlarged skull, and hearing loss. The diagnosis is frequently confirmed by radiographic and nuclear scintigraphy of the bone. Further, bisphosphonates such as zoledronic acid and pamidronate are effective for its treatment. Moreover, biochemical monitoring is superior to the symptoms as a recurrence indicator. This article discusses the updates of Paget’s disease of bone with a clinical case.
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최용준,유정래 대한전자공학회 2016 전자공학회논문지 Vol.53 No.4
본 논문에서는 운전자의 체중 이동을 활용한 메카넘 휠 기반 전방향 전동 보드 제어 방법을 제안한다. 운전을 위한 별도의 운전 장치를 사용하지 않으며, 다수의 센서를 활용하여 측정한 체중 분포로부터 무게 중심의 위치를 구하여 전방향 전동 보드의 병진 운동과 회전 운동의 3 자유도 운전 명령을 생성한다. 체중 이동은 운전 명령으로 반영됨과 동시에 관성력을 극복하기 위한 운전자의 동작과 일치하여 직관적인 장점이 있다. 전체 제어 구조를 제시하며, 실험에 적용하여 제안된 방식의 타당성을 확인한다. This paper presents a control method of a mecanum wheel-based omni-directional electric board using driver weight shift. Instead of a steering device such as a joystick or a remote controller, 3 degree-of-freedom driving command for translational and rotational motion of the omni-directional electric board is generated from position of center of gravity measured from weight distribution. The weight shifting motion is not only a driving command but also an intuitive motion to overcome inertial forces. The overall control structure is presented with experimental results to prove validity of the proposed method.
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열다한소탕(熱多寒少湯)이 혈압(血壓), 국소뇌혈류량(局所腦血流量) 및 뇌연막동맥(腦軟膜動脈)에 미치는 영향(影響)
최용준,김경요,한종현,강성용,Choi, Yong-joon,Kim, Kyung-yo,Han, Jong-hyun,Kang, Sung-yong 사상체질의학회 1998 사상체질의학회지 Vol.10 No.1
Yuldahansotang(YH) has been used in Sasang(四象) constitution medicine for many years as a therapeutic agent for cerebral disease. The effect of YH on the vascular system is not known. The purpose of this study was to determine the effect of YH on blood pressure, regional cerebral blood flow(rCBF) and pial arterial diameter of rats. 1. Blood pressure decreased by YH in rats. 2. rCBF was increased by YH in a dose-dependent manner. 3. Pretreatment with propranolol, methylene blue and indomethacin significantly inhibited YH induced increase in rCBF. 5. Blood pressure increased by Radix Puerariae(RP) and Radix Ligustici Tenuissimae(RLT) but Radix Scutellariae(RC) decreased blood pressure in rats. 6. rCBF was increased by RP and RLT in a dose-dependent manner but RC decreased low dosage, and RC increased high dosage. 7. Pial arterial diameter was increased by YH in a dose-dependent manner. 8. Pretreatment with propranolol significantly inhibited the increased in pial arterial diameter induced by YH. These results suggest that YH causes a diverse response of blood pressure, regional cerebral blood flow(rCBF) and pial arterial diameter. The increase in rCBF is also mediated by prostaglandins, cyclic GMP and adrenergic ${\beta}$ receptor and the increase in pial arteral diameter is mediated by adrenergic ${\beta}$ receptor.
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