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최영철(Youngchul Choi),김철호(Chulho Kim),이현채(Hyunchae Lee),서영택(Youngtaek Seo),한용운(Youngoun Han),송정일(Jungil Song) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.6
In this study, a small wind turbine airfoil specialized for national wind condition was designed in order to develop the furling control type HAWT. And then a flow analysis was carried out based on the blade drawing which was designed to characterize of the developed airfoil. The result of the flow analysis showed that the torque on the 3 blades was 180.23N.m. This is equivalent to an output power of 5.66kw and an output efficiency of 0.44. Then we produced and constructed a 3㎾ - furling control type HAWT by getting the system unit design technology such as the specialized furling control device. By operating this turbine, we could get 3㎾ of the rated power at a wind speed of 10.5㎧ through the ability test. Cut-in wind speed was 2㎧, generator efficiency was 92% at the rated power output. Sound power level was 87.2㏈(A). Also we observed that the output power was limited to 10.5㎧ with furling system operation.
김지혜(Jihye Kim),신창섭(Changseob Sin),박종옥(Jong-ok Park),이현채(Hyunchae Lee),김지혜(Jihye Kim),김도형(Dohyeong Kim),김상희(Sanghee Kim) 인간식물환경학회 2021 인간식물환경학회지 Vol.24 No.4
Background and objective: This study verified the physiological and psychological effects of plant fragrance therapy to analyze whether the therapy has a forest healing effect on maladjusted soldiers. Methods: This study was conducted from March 14 to May 31, 2020 according to the Green Camp curriculum for 2 weeks per recruit class. Thus, plant fragrance therapy was implemented twice each for three recruit classes. Each session of the program was carried out for 4 hours from 1 p.m. to 5 p.m. The venue was the garden within the camp and the forest nearby. Forest healing activities using plant fragrances were led by 1 forest education specialist and 1 assistant. The effects of plant fragrance therapy for maladjusted soldiers were analzed analyzed by quantifying physiological and psychological changes through measuring brain waves and stress levels before and after the therapy. Results: As a result of analyzing BRQ and SQ to determine the physiological and psychological healing effect of plant fragrance therapy, both the left and right brain showed higher BRQ and SQ after the therapy with statistical significance. This indicates that plant fragrance therapy on maladjusted soldiers helped positively stabilize their negative psychological and behavioral dispositions, and stabilization of brain waves lowered physical and mental stress and improved self-regulation and immunity. On the other hand, there was no significant difference in ATO. This is the result of analyzing the stress-coping mechanism. Troubleshooting (t = -2.702, df = 61, p = .009), emotional remission (t = -2.173, df = 61, p = .034), pursuit of help (t = -3.286), df = 61, p = .002), and wishful thinking (t = -3.714, df = 61, p < .001) showed statistically significant results. Conclusion: Applying plant fragrance therapy to maladjusted soldiers positively stabilized their negative psychological and behavioral dispositions and helped their self-regulation. Thus, plant fragrance therapy has psychological and physical forest healing effect on maladjusted soldiers.