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서민태,채혜선,김성우,임철민,이경숙 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.4
When people scoop and turn soil upside down, we had been trying to invent convenient instrument, to reduce burden on their body physically, producing prototype and tried to evaluate effect when we use it. When people use shovel in work, most of works require repeated action and load pressure on body, it could possibly cause occupational disorder in musculoskeletal part. To prevent such disorder, it is urgent to invent and distribute agricultural instruments and convenience equipment. Twenty men in total have participated in experimentation and based on blue-print, we produced prototype and performed comparative evaluation on work load of generally used shovel and newly invented shovel using %MVC, AULA position assessment and uncomfortable degree. When using generally used shovel, what caused biggest discomfort is “burden caused when scooping soil” participators in survey responded following in order: waist, arm, shoulder, hand and neck. In outcome by AULA evaluation, it rated 1.75 and risk level rated 2, which apparently seemed a bit dangerous. However, we analyzed it that it needs consistent and repeated work for improvement. In outcome of EMG evaluation, scooping and turning soil upside down causes muscle to be spent and comparatively muscle on left seemed to be activated more than on right. When we performed both objective and subjective assessment for evaluating two kinds(generally used and newly invented) of shovel, it has come out that using newly invented shovel caused less burden on body and makes other part more comfortable except for hand. Even though presently invented shovel is just a prototype, we expect that we will be able to use more efficient shovel if its material changes and structure is much more improved.
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서민태,채혜선,김성우,임철민,이경숙 한국경영과학회 2015 한국경영과학회 학술대회논문집 Vol.2015 No.4
When people scoop and turn soil upside down, we had been trying to invent convenient instrument, to reduce burden on their body physically, producing prototype and tried to evaluate effect when we use it. When people use shovel in work, most of works require repeated action and load pressure on body, it could possibly cause occupational disorder in musculoskeletal part. To prevent such disorder, it is urgent to invent and distribute agricultural instruments and convenience equipment. Twenty men in total have participated in experimentation and based on blue-print, we produced prototype and performed comparative evaluation on work load of generally used shovel and newly invented shovel using %MVC, AULA position assessment and uncomfortable degree. When using generally used shovel, what caused biggest discomfort is “burden caused when scooping soil” participators in survey responded following in order: waist, arm, shoulder, hand and neck. In outcome by AULA evaluation, it rated 1.75 and risk level rated 2, which apparently seemed a bit dangerous. However, we analyzed it that it needs consistent and repeated work for improvement. In outcome of EMG evaluation, scooping and turning soil upside down causes muscle to be spent and comparatively muscle on left seemed to be activated more than on right. When we performed both objective and subjective assessment for evaluating two kinds(generally used and newly invented) of shovel, it has come out that using newly invented shovel caused less burden on body and makes other part more comfortable except for hand. Even though presently invented shovel is just a prototype, we expect that we will be able to use more efficient shovel if its material changes and structure is much more improved.
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Fruit peel-inspired hydrogel capsules for encapsulation of active ingredients
서민태,김진웅 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The surface of the most fruits is covered with a peel that provides protection against dehydration and nutrient oxidation. The epidermis of fruit peels is covered by a cuticle and several bio-cellulose layers. Cuticle wax at the outermost layer minimizes the water loss. The phenolic compounds in the epidermis protect antioxidant components in the mesocarp. To mimic the structure of fruit peels, we coated gelatin hydrogel microparticles with alternate layers of poly(diallyldimethylammonium chloride) and bio-cellulose. The outermost layer was made with dodecane nanoemulsions that are stabilized by poly(ethylene oxide)-block-poly(caprolactone) copolymers. We also incorporate a phenolic compound, gallic acid, in the epidermis layer. Finally, we demonstrated that formation of the hybrid shell layers showed enhanced cargo retention against leakage of antioxidants as well as oxygen attack from the surroundings.
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서민태,채혜선,김성우,임철민,이경숙 대한산업공학회 2015 대한산업공학회 춘계학술대회논문집 Vol.2015 No.4
When people scoop and turn soil upside down, we had been trying to invent convenient instrument, to reduce burden on their body physically, producing prototype and tried to evaluate effect when we use it. When people use shovel in work, most of works require repeated action and load pressure on body, it could possibly cause occupational disorder in musculoskeletal part. To prevent such disorder, it is urgent to invent and distribute agricultural instruments and convenience equipment. Twenty men in total have participated in experimentation and based on blue-print, we produced prototype and performed comparative evaluation on work load of generally used shovel and newly invented shovel using %MVC, AULA position assessment and uncomfortable degree. When using generally used shovel, what caused biggest discomfort is “burden caused when scooping soil” participators in survey responded following in order: waist, arm, shoulder, hand and neck. In outcome by AULA evaluation, it rated 1.75 and risk level rated 2, which apparently seemed a bit dangerous. However, we analyzed it that it needs consistent and repeated work for improvement. In outcome of EMG evaluation, scooping and turning soil upside down causes muscle to be spent and comparatively muscle on left seemed to be activated more than on right. When we performed both objective and subjective assessment for evaluating two kinds(generally used and newly invented) of shovel, it has come out that using newly invented shovel caused less burden on body and makes other part more comfortable except for hand. Even though presently invented shovel is just a prototype, we expect that we will be able to use more efficient shovel if its material changes and structure is much more improved.
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Enhanced penetration of hybrid polymeric micelles for transdermal delivery
서민태,이진용,홍성준,김진웅 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Polymeric micelles have inherent and modifiable properties for suitable for transdermal delivery system. This study attempts to investigate the permeability of active materials that is supplemented with novel hybrid polymeric micelles comprised of two block copolymers in order to enhance penetration in the skin. For this, two triblock copolymers, which are poly(ethylene glycol)-b-poly(ε-caprolactone)-b-poly(ethylene glycol) and poly(ethylene glycol)-b-polydimethylsiloxane-b-poly(ethylene glycol), are prepared by urethane polymerization. We optimize the suitable size and significant stability of polymeric micelles by changing the mixing ratio between two block copolymers, which show remarkable permeation performance of skin layers as well as excellent stability.
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서민태,이진용,김진웅 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Polymeric micelles with inherent and modifiable phases have widened their practical applicability to drug delivery. To further modify the phase property of polymeric micelles, we synthesize two amphiphilic block copolymers, poly(ethylene oxide)-b-poly(ε-caprolactone)-b-poly (ethylene oxide) (PEO-b-PCL-b-PEO) with a crystalline hard block and poly(ethylene oxide)-b-polydimethylsiloxane-b-poly(ethylene oxide) (PEO-b-PDMS-b-PEO) with a silicone soft block. Basically, we investigate how mixing these two block copolymers affect their phase miscibility, phase transition, and phase rigidity, by using DSC, XRD, and NMR analyses. From the insight gained from the phase property analyses, we then design new hybrid polymeric micelles by solely changing the mixing ratio. Finally, we experimentally show that our polymeric micelles with controlled phase properties can be used as vehicles for improved transdermal delivery.
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