• 한국생산제조학회지
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• 제25권5호
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• pp.338-344
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• 2016

Recent trends in transport system for carrying heavy freight are that demands of a high efficiency, economic efficiency, convenience and safety are increased. Conventional transport systems were poor in transport efficiency and economic efficiency. And Safety problems can be caused to products and workers. In order to overcome these problems, an air cushion transport device with a high-pressure air is required. The air cushion transporter is a device for reducing the frictional force of floor surface and lifting the heavy freight by spraying the high-pressure air to the floor. Technology to float and transfer freight using high-pressure air is very convenient and initial cost can be reduced. In this paper, the study on the levitation performance and transport efficiency of air cushion transport system is conducted and verified that air cushion transporter has a significantly higher transport efficiency than conventional heavy handling systems.

• 한국정밀공학회지
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• 제20권1호
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• pp.7-25
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• 2003

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.295-296
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1333-1334
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• 2011

• 한국콘텐츠학회논문지
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• 제12권10호
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• pp.116-127
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• 2012

최근 국내 해양레저 인구의 급속한 증가에 따라 해양 레저산업이 발달할 수 있는 좋은 기회를 맞이하고 있다. 이러한 배경을 바탕으로 해양레저 용품 중 가장 범용성 있는 제품인 공기주입식 튜브데 대한 아이디어 상품개발은 국내 해양레저기업의 매출확대와 신시장 개척을 도울 수 있을 것이다. 연구방법으로는 크게 4단계로 나누어, 기초 선행연구조사(Investigation) - 조사결과의 분석과 종합 (Analysis & Synthesis) - 제품 디자인 개발(Development) - 제품 디자인개발안 평가(Evaluation)로 진행하였다. 본 연구에서는 공기주입식 튜브에 패브릭 커버를 씌워 쿠션 또는 아동용 놀이 가구로써 365일 가정에서 이용할 수 있는놀이형 튜브쿠션 디자인을 제안 하였다. 커버로는 촉감이 좋은 감성적 소재의 네오프렌(Neoprene)과 에어메시(Air-mesh) 패브릭을 사용하여 지퍼를 달아 씌우고 벗기기 쉽도록 하였다. 그리고 튜브끼리 끼워 조립하고, 스냅단추가 부착된 스트랩으로 연결하여 의자, 테이블, 터널, 기차 등 다양하게 응용할 수 있어 창의적인 놀이 활동이 가능도록 배려된 디자인이다. 본 연구는 해양레저 상품의 장기적 안목의 관점에서 차별화된 아이디어 상품으로 해양레저 용품 뿐 만 아니라 가정 및 어린이 놀이시설 등 크로스오버(Crossover)된 새로운 블루오션(Blue Ocean)시장을 창출 할 것으로 기대한다.

• 한국산업융합학회 논문집
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• 제23권5호
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• pp.843-852
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• 2020

Among the many packaging materials used in cushion packaging, there is a lack of optimum design for packaging trays and cushion pads used in pear packaging for export and domestic distribution. It causes over-packaging due to excessive material input, and can be solved by applying various parameters needed to optimize the design of the packaging tray and cushion pad considering the packaging material and the number of pears in the box. In the case of a cushion pad for pears, the economic efficiency of material and thickness should be considered. Therefore, it is possible to design a packaging tray and cushion pad depending on eco-friendly packaging materials (PLA, PET) used by applying appropriate design parameters. The static characteristics of the materials used for the packaging of pears were analyzed using FEA (finite element analysis) simulation technique to derive the optimal design parameters. In this study, we analyzed the contact stress and deformation of PET, PLA tray (0.1, 0.5 1.0, 1.5 and 2 mm) and PET foam (2.0, 3 .0 and 4.0 mm) with pears to derive appropriate cushion packaging design factors. The contact stress between the pear and PET foam pad placed on PLA, PET trays were simulated by FEA considering the bioyield strength (192.54±28 kPa) of the pears and safety factor (5) of packaging design, which is the criterion of damage to the pears. For the combination of PET tray and PET foam buffer pad, the thickness of the PET foam is at least 3 mm, the thickness of the PET foam is at least 1.0 mm, the thickness of the foam is at least 2 mm, and if the thickness of the PET tray is at least 1.5 mm, the thickness of the foam is at least 1 mm, suitable for the packaging design. In addition, for the combination of PLA tray and PET foam pad, the thickness of the PET foam was not less than 2 mm if the thickness of the PLA tray was 0.5 mm, and 1 mm or more if the thickness of the PLA tray was not less than 1.0 mm, the thickness of the PET foam was suitable for the packaging design.

• 드라이브 ㆍ 컨트롤
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• 제13권4호
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• pp.1-6
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• 2016

Typically, the seat of an automotive vehicle generally includes a horizontal seat-cushion portion and a vertical seat-back portion that is operatively connected to the seat-cushion portion. The seat may include a recliner for the reclining of the seat-back portion relative to the seat-cushion portion by the seat occupant. An energy absorber or damper can also be provided for the seat-back portion. Because the recliner is configured to be released at a relatively high speed, and it results in an impact at the end of a folding stroke, the damper needs to dissipate energy as the seat back moves with respect to the seat cushion; therefore, the role of the seat damper in the automotive-seat design is important. In this paper, the mechanism of an hydraulic-type automotive-seat damper is investigated, and the torque characteristic is simulated according to the design-parameter variations such as the orifice area and the working-fluid properties.

• 동력기계공학회지
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• 제19권5호
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• pp.17-24
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• 2015

In this paper, the development of an air cushion transporter has been studied. To do this, theoretical analysis is introduced to design the equipment and computational fluid dynamics is also conducted. Design of an air cushion transporter for heavy load carriage is completed and a prototype is manufactured. Through the analysis and experiment of the developed the prototype, it can be known that the developed transporter can levitate the load of about 1 ton at the applied pressure of 0.2 MPa and the maximum lifting height at this condition is 17mm.

• Journal of Biosystems Engineering
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• 제20권4호
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• pp.323-332
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• 1995

The horizontal compression test of some selected corrugated fiberboards was performed to determine the cushioning properties of them. Creep behavior of the corrugated fiberboard boxes, which have been widely used in rural area for packaging fruits and vegetables, was tested. The flute crushing stress of the corrugated fiberboard depended upon mainly the basic weight of the corrugated medium, comparing with the combined basic weight of corrugated fiberboard. When moisture content of the corrugated fiberboards was increased about 8% (d.b.), the flute crushing stress of them was decreased at the rate of 44%~64%. The cushion factor of the sample fiberboards showed much higher value at the lower moisture content of them. These trends appeared to be more obvious at the lower applied stress levels. Also, the cushion factors of the double wall corrugated fiberboards(DW) were observed to be little higher than those of the single wall corrugated fiberboards(SW). The creep behavior of the sample boxes was found to be highly moisture and static load dependent. The creep behavior of the corrugated fiberboard boxes could be well analyzed by the asymptotic slope derived from the creep model.

• 한국기계가공학회지
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• 제14권4호
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• pp.126-133
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• 2015

To enhance the productivity and quality of the compound process of progressive dies and transfer dies, the semi-progressive method is applied in the material supply step to produce blanks, and then the transfer method is applied. Parts are transferred among processes by means of the finger and transfer bar in the transfer die, and the final seat cushion panel is produced. The main challenge in the current study is how to deform a seat cushion panel while meeting the design specifications without any defects. In order to obtain this technology, a sheet metal-forming simulation and die forming of the seat cushion panel were adopted; as a result, a compound die-forming technology for the automotive seat cushion panel, combining both semi-progressive die and transfer die for continuous production, was successfully developed.