• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2013년도 춘계학술대회 논문집
• /
• pp.925-926
• /
• 2013

• 드라이브 ㆍ 컨트롤
• /
• 제13권4호
• /
• pp.1-6
• /
• 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.

• 대한인간공학회지
• /
• 제32권1호
• /
• pp.145-152
• /
• 2013

Objective: The aim of this study is to develop an ergonomic office chair that has an alarm function for the unbalanced sitting postures. Background: Contrary to expectation, it is reported that office workers sit on their chairs much more in unbalanced postures during daily work. Even though an office worker uses an ergonomically good-designed chair and begins their work in a good sitting posture, his/her posture is likely to shift to the unbalanced bad posture. Therefore, a posture alarm system would be very helpful in keeping office workers' good postures. Method: We developed a prototype chair with four load cells under a seat pan and one load cell beneath a backrest. Through some experiments, we set the criteria for unbalanced bad postures then implemented the criteria into the alarm system of the prototype chair. The chair called e-BASE chair could detect unbalance postures and show alarms for chair users. We also enhanced back support by developing a step-wised folding backrest. Results: The e-BASE chair showed better performance in interface pressure distributions and balanced posture ratio in VDT work. Conclusion: The ergonomic chair with posture alarm function(e-BASE chair) was developed. It showed better performance in seat pressure distribution and in keeping good posture during office work. Application: The posture alarm system and folding backrest can be applied to the new models of office chair.

• 한국자동차공학회논문집
• /
• 제22권3호
• /
• pp.203-209
• /
• 2014

The rear center-hinge bracket is designed for supporting and folding the rear-seat backrest. This bracket needs to be strong enough to be able to rigidly hold the rear-seat backrest and to withstand luggage loads from the car trunk that are generated when a vehicle is driving on the roads. Particularly, current accident studies report that many serious occupant injuries occurred when the rear-seat back easily folded inward toward the car interior, driven by the luggage loads in the trunk. Given this fact, the robust design of the rear center-hinge bracket that mainly supports the rear backrest has become more important for providing customer safety and preventing high warranty and durability problems. However, none of the studies have emphasized its significant role and considered its robust optimization. Therefore, this paper presents how the hinge-bracket design is optimized based on an application of the finite-element method coupled with the parameter design using Taguchi's design experiment. Finally, Taguchi method's application optimizes a robust center-hinge bracket that shows more rigid performance although it has lighter weight and thinner thickness.

• 동양고전연구
• /
• 제62호
• /
• pp.263-289
• /
• 2016

춘추전국시대에 활동한 공자는 수많은 어록을 남기면서 제자를 양성한 교육자이며 한중일 지식인의 존경을 받아 온 대표적인 성현이다. 공자의 행적 및 제자와 경험한 재미있는 에피소드는 그림과 조각 등으로 다양하게 시각화되었다. 특히 공자와 그의 제자 자로가 노나라 환공의 묘에서 기기(?器)를 발견하고 중용의 원리를 터득하여 '좌우명(座右銘)'으로 삼았다는 일화는 조선 왕실을 비롯한 문인들에게 꾸준히 사랑을 받으며 그림으로 표현되었다. 이 일화를 담은 기기도는 그릇만 표현한 정물화와, 공자가 기기를 관찰하는 사건을 그린 인물화로 분류된다. 전자는 백성을 공평하게 다스리고 행동거지를 바로하기 위한 중용의 척도로, 후자는 공자의 일생을 표현한 성적도에 포함되어 교육용 시각물로 활용되었다. 그러나 공자가 기기를 관찰하는 장면은 단독 장르로 독립하거나 인물화 병풍에 수록되었다. 공자의 다른 일화가 도(道)의 계보를 시각화 한 화첩에 포함된 반면, 공자가 기기를 관찰하는 장면은 풍류와 서화 골동 감상을 즐기는 문인들을 그려 모은 병풍에 포함된 것이다. 이렇듯 기기도는 공자의 일화를 그린 인물화의 기능과 상징성을 여러 각도로 알려주는 그림이라 할 수 있다. 기기도의 형식을 분류하고, 시대와 목적에 따라 변화하는 조형성을 분석하여 공자의 일화를 그린 그림들의 다양한 면모를 규명하고자 하는 이 글을 통해 옛 성현의 이야기를 재현하는 방법과 감상 코드에 따른 표현상의 차이가 파악될 것이다.

• 한국생활과학회지
• /
• 제16권6호
• /
• pp.1243-1250
• /
• 2007

The purpose of this study was to compare government guidelines and foreign guidelines related to furniture design for elderly. Future elderly will increasingly accustomed to the provisions of improved housing, education and welfare in comparison with our forebears. Also, there will be upgrading and different need for elderly furniture in our market. The results were as follows. The height of bed was based on the height of wheelchair seat, commonly. A adjustable bed was recommended for abled and disabled elderly. A pull-down shelf, drawer, empty space under chest, folding or sliding door in wardrobe and so on were recommended as a elderly furniture. It were good adjustable sink on human scale. There were need the empty space under sink for wheelchair users, one-touch or lever faucet, etc. There have given a little furniture design guidelines for elderly in Korea until now. But those guidelines haven't been considered enough human scale of elderly including wheelchair user. Because the close investigations have not made about abled and disabled elderly for their furniture design. So first of all, the government should be examined elderly physical size more accurately for elderly furniture design. The guideline for elderly furniture design should be for abled elderly and the disabled, too.

• 한국정밀공학회지
• /
• 제17권4호
• /
• pp.220-225
• /
• 2000

This paper develops a finite element model for studying occupant behavior of a mid-size truck equipped with a driver side airbag. The developed model simulates an occupant behavior using PAM-CRASH/PAM-SAFE in super computer SP2. The model is developed based on a sled test. A 50% hybrid dummy III is used for measuring head and chest accelerations and femur loads, and major injury coefficients such as HIC, CA and femur load. Inferior components such as foot rest, seat, kneebolster, crash pad, etc. are roughly modeled and defined by a rigid material model. And contact type II is used for detecting a contact with dummy. Contact type II definition uses force-deflection relationship of each body Such components as steering column which directly affect on the occupant injuy are modeled in detail and defined by an elastic-plastic material model. Airbag cushion is modeled using rivet elements. Airbag cover groove is modeled using rivet elements. Airbag tether is modeled as nonlinear bar elements. Airbag model has two vent holes to ventilating the exploded gas. Airbag is folded close to the real airbag folding procedure, and folded cautiously in order not to have initial penetration. A vehicle pulse acquired from 31mph frontal barrier test is used as input signal for the simulation. The simulation conditions are tuned to the sled test ones. The measured dummy accelerations and major injury coefficients, and filmed dummy behavior and airbag inflation process using high speed camera are compared to the simulation results to verify the developed finite element model.