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김현준(Hyeon jun Kim),여현진(Hyeon Jin Yeo),김성수(Sung soo Kim),장성호(Sung ho Chang),이상호(Sang ho Lee),배익순(Ik soon Bea) 한국산업경영시스템학회 2015 한국산업경영시스템학회 학술대회 Vol.2015 No.추계
With the increase in elderly population rate, interest in development of equipment to aid for the elderly activities has been increased. Since the physical features of repetitive behavior of elderly people standing and sitting can cause the stress on certain parts of the body, The necessity of developing Lift Chair concerning the foregoing problem has been to the fore. In this study, we set the average body size of the elderly aiming to develop non-motorized Lift Chair, developed Non-motorized tilting mechanism based on the Muscle strength change at knee angle, and did a study relatively inexpensive Lift Chair considering esthetic and practicality
김현준(Hyeon Jun Kim),여현진(Hyeon Jin Yeo),김성수(Sung Soo Kim),장성호(Sung Ho Chang),이상호(Sang Ho Lee),배익순(Ik Soon Bae) 한국산업경영시스템학회 2015 한국산업경영시스템학회지 Vol.38 No.4
The aging of Korea is rapidly advancing in an unprecedented rate in the world. Indoor and outdoor safety accidents involving the elderly frequently occur, with elderly population increasing. Because the physical strength of elderly is decreased, it is necessary to develop devices that aid the everyday life of the elderly to prevent safety accidents. Among many activities, the motions of standing from and sitting on a chair require much physical strength from particular body parts, which causes an overload for particular body parts. To the elderly the repeating motion of standing from and sitting down on a chair is burdensome, because they do not have enough physical strength compare to young persons . As a result the elderly could be injured or falling during standing or sitting. Therefore, the development of a lift chair that considers the problems mentioned above is necessary to prevent the safety accidents of the elderly. The study designed a non-motorized lift chair that comfortably aids the standing and sitting down motion for the use of the elderly by reflecting the anthropometric data of the Korean elderly over 65 years old. Also the design was implemented to smoothly aid the standing motion by considering the knee angle of the elderly when standing. Because the regained strength to stand from a chair is depend on the knee angle. Unlike existing lift devices, this device utilizes a tilting mechanism that does not use electric power so that the product could be composed inexpensively than existing chairs released in the market.
장정화(Jeong Hwa Jang),여현진(Hyeon Jin Yeo),김정원(Jeong-won Kim),김수린(Soo Rin Kim),정영훈(Young Hoon Jung) 한국생물공학회 2018 KSBB Journal Vol.33 No.4
Considerable increase in coffee consumption has caused the necessity of valorization of coffee waste material. Accordingly, conversion of coffee wastes containing various organic compounds such as cellulose and hemicellulose into value-added materials is getting highlighted. In this study, we evaluated the feasibility of glucose production through acid pretreatment followed by enzymatic conversion process from spent coffee grounds (SCG), one of the major coffee waste material. After pretreatment at various conditions such as solids loading of 5% (w/v), 10%, 15%, pretreatment time of 30 min, 60 min, 90 min, and acid catalyst concentrations of 0% (w/v), 1%, 5%, the chemical compositions of the SCG and the hydrolysis efficiency using 10 filter paper unit (FPU) of cellulase per g of glucan were compared. The enzymatic hydrolysis yield of SCG on the basis of theoretical maximum glucose yield was observed to be 85.4% after the pretreatment using 10% SCG for 60 min by 1% sulfuric acid. In comparison with the 7 g of glucan amount from 100 g of original SCG, the combination of pretreatment and enzymatic hydrolysis can produce 74 g of glucan. This result suggests that spent coffee grounds can be utilized as a source of glucose.