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안재규,이건욱,오일호,문형필,류성무 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.12
Gas pipelines are subject to periodic inspection and maintenance for safety and longevity. Many robotic inspection systems have been developed for in-pipe applications, but systematic geometric design methodology that is suitable for in-pipe navigation has not been well studied so far due to difficulties in predicting the capability of maneuvering through the obstacles inside of pipelines such as bend, miter, and T-branch joint. The geometric design of the robot is critical to the performance of such in-pipe robots because the actuation and the measurement are constrained by the shape and the size of the robot. In this paper, we propose a design methodology that finds the maximum value of geometric design parameters of the robot with recursive evaluation of the parameter values in the design parameter space. The role of the design space division is to reduce the search region and to increase the number of parametric samples to near optimal values. As a parameter evaluation method, we adapt Rapidly exploring random tree (RRT) because it is known to be suitable for solving narrow passage problems for high-dimensional systems. Our design method makes it possible to find an optimal parameter set without computing complex cost functions. The design result of the in-pipe robot is 8 % larger than that of a heuristic geometry-based approach in three-parameter design problem.
기공 운동 치료가 고혈압에 미치는 영향 : 체계적 문헌 고찰
안재규(Jae-Gyu An),이상현(Sang-Hyun Lee),김현태(Hyun-Tae Kim),박선영(Sun-Young Park),허인(In Heo),정민정(Min-Jeong Jeong),황의형(Eui-Hyoung Hwang),장인수(In-Soo Jang) 척추신경추나의학회 2020 척추신경추나의학회지 Vol.15 No.2
Objectives This study verified the clinical effectiveness of Qigong exercise therapy for individuals with hypertension. Methods Ten electronic databases were used for information retrieval. Only randomized controlled trials (RCTs) using Qigong exercise therapy as a treatment for hypertension were included in this study. Cochrane risk of bias tool was used to assess the methodological quality of each RCT. Results After a thorough review, six RCTs were deemed eligible. These studies were divided into two groups: Qigong vs. no intervention and Qigong plus anti-hypertensive drug vs. anti-hypertensive drug alone. Among the six RCTs, four studies were Qigong vs. no intervention, and two studies were Qigong plus anti-hypertensive drug vs. anti-hypertensive drug alone. The meta-analysis demonstrated that adding Qigong exercise to anti-hypertensive drug treatment lowers diastolic blood pressure more than the anti-hypertensive drug alone. Conclusions Although Qigong exercise is not widely used in the Korean medical field, the results of this study demonstrated the necessity of exercise while controlling hypertension. However, the number of included studies was small, with their high risk of bias. In conclusion, although it is difficult to determine whether Qigong exercise lowers blood pressure in hypertensive patients, exercise including Qigong must be parallel with the intake of anti-hypertensive drugs.
옹호경,안재규,김대영 대한건축학회지회연합회 2006 대한건축학회지회연합회 학술발표대회논문집 Vol.2 No.1
survey had been made to identify decreasing factors of productivity. Targets of the survey were designers who is working in design offices. From the questionnaire survey, the causes of decreasing factors of productivity were identified and the result was obtained. Based on the result, the design management process was developed. The conceptual basic theory of the model was adopted from lean construction principles which emphasized the reducing wastes in construction process. This study suggested five procedure modules for a conceptual design process model. Consequently, the quality of design will be possibly guaranteed with this conceptual model, and the improved quality of design also can help to make productivity improvement in the construction phase.