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장준호(Chang Joonho),이상윤(Lee Sangyoon),홍성철(Hong Sungchul),이우식(Lee Usik) 한국철도학회 1999 철도저널 Vol.2 No.3
The acoustic power reduction method can be used to design a quiet structure. To calculate the acoustic power radiated from a vibrating structure, the dynamic responses have to be determined. It is not easy to analyse the structure composed of the corrugated panels because of the structural complexity and the long analysing time. To make up for these defects, the equivalent orthotropic panel is presented. Also the acoustic power prediction method of the vibrating structures is proposed. As examples, the equivalent material properties of the corrugated plates are obtained and the acoustic powers of the floor structure are calculated at several frequency regions for the Korean High Speed Train.
정기효(Kihyo Jung),장준호(Junho Chang),이원섭(Wonsup Lee),장준호(Joonho Chang),유희천(Heecheon You),장수영(Soo Y. Chang),전치혁(Chihyuck Jun) 한국공학교육학회 2008 공학교육연구 Vol.11 No.3
기업에서는 경쟁력 제고를 위해 혁신제품개발 전문인력을 필요로 하나, 혁신제품개발 전문인력을 위한 대학의 교육과정 개설은 미흡한 실정이다. 본 연구는 대학에서 혁신제품개발 교과과정 개발을 위한 체계적 전략수립 방법을 제안하고 교육과정 개발에 적용하였다. 본 연구의 전략수립 방법은 순차적인 3 단계(전략요소 도출, 전략적 과제 수립, 전략실행 roadmap 수립)로 구성되어 체계적으로 교과과정 개발을 위한 전략을 수립할 수 있게 한다. 또한, 개발된 전략수립 방법은 P 대학의 “인간친화형 혁신제품 개발 모듈 교육과정” 개발 전략수립에 활용되었다.본 연구의 혁신제품개발 교육과정 개발 전략수립 방법은 제품개발 교육과정뿐만 아니라, 대학의 특성을 고려한 차별화된 신규 교육과정 개발에 유용하게 활용될 수 있을 것이다. Far greater than ever before is the present industrial demand for skilled professionals in innovative product design and development. Yet there is an apparent lack of a sufficient curricular provision for training design professionals in almost all engineering schools. The present study is to propose a systematic procedure for developing a strategy for building an innovative product design curriculum and demonstrate its application. The procedure consists of three major steps: strategic element derivation, task formulation, and task execution roadmap construction. The proposed procedure was applied to develop a modular curriculum (a cluster of several related courses) covering various subjects in relation to innovative product design and development. The procedure seems quite effective and useful for developing a curriculum that is strategically well differentiated based on the unique characteristics of a particular educational institute and its applicability seems not limited to a specific domain.
승용차 센터페시아의 버튼 각도에 따른 버튼 조작 힘과 만족도 평가
박석봉(Seokbong Park),장준호(Joonho Chang),정기효(Kihyo Jung) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.4
Objective: This study examined the angular effects of a button on the center fascia of vehicle in terms of push force and satisfaction score. Background: The angle of buttons on the center fascia may influence usability and user experience. However, a comprehensive study to investigate the angular effects of a button has been lacking. Method: This study measured push forces and satisfaction scores for six angles (0°, 10° 20°, 30°, 40°, and 50°) of a button for 25 male participants. Push forces applied on a button with the right index finger were recorded using a force sensitive resistor, which was placed on a button. Subjective satisfaction scores were observed using a 5-point scale (1 = very dissatisfied, 3 = neutral, 5 = very satisfied). Results: Mean push forces at button angles 0~30° (mean ± SE; 3.31±0.06N) were significantly higher than the other angles (3.10±0.05N). Similarly, peak push forces at button angles 0~20° (4.43±0.04N) were higher than the other angles (4.28±0.04N). Satisfaction scores at button angles 10~30° (3.86±0.18) were higher than the other angles (2.50±0.18). The debriefing on experiment results revealed that participants preferred button angles 10~30° since it improved button usability and visibility than the other angles. Conclusion: The button angles 10~30° can help effective force transmission and improve subjective satisfaction. Application: The angular effects of a button identified in this study can be applied in ergonomic design of buttons on the center fascia of vehicle.
체계적 간병 서비스 지원을 위한 인간공학적 간병 시스템 개발
장진아(Jinah Jang),장준호(Joonho Chang),정기효(Kihyo Jung) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.1
Objective: This study is intended to develop an Ergonomic caregiver-supporting system that can provide and manage care services in a systematic way. Background: The demands on patient care at nursing homes and hospitals are increasing as aged population and life expectancy increase. However, the quality of current care services merely depends on caregiver"s experiences and thus inconsistent care services are often provided to patients. Therefore, a systematic caregiver-supporting is warranted to provide professional care services to patients. Method: A user needs survey was performed to identify care services by a omprehensive literature review. In addition, a usage scenario analysis was conducted to define system functions required to fulfill the care services surveyed. Next, to develop the caregiver-supporting system, this study prepared a comprehensive set of user interface design principles by combining Nielsen"s heuristics, Gerhardt-Powals" cognitive engineering principles, and Weinschenk and Barker"s classification. Results: The user needs survey listed up care services, and the usage scenario analysis defined three main modules of the system: (1) user management module, (2) care service module, and (3) care manual module. This study implemented the caregiver-supporting system that can be operated on a tablet computer with a touchscreen based on the user interface design principles defined in this study. The caregiver-supporting system developed in this study can help provide professional care services in a systematic way, which can improve user experience and satisfaction. Conclusion: The caregiver-supporting system is expected to improve the extent of care service quality by systematically providing and managing care services. Application: The caregiver-supporting system can be used at nursing homes and hospitals in order to provide professional and systematic care services.
Digital Human Model Simulation을 위한 RAMSIS 추정 운전자세의 정합성 평가 및 개선
박장운(Jangwoon Park),정기효(Kihyo Jung),장준호(Joonho Chang),권정웅(Jeongung Kwon),유희천(Heecheon You) 대한산업공학회 2010 산업공학 Vol.23 No.2
For proper ergonomic evaluation using a digital human model simulation (DHMS) system such as RAMSIS<SUP>®</SUP>, the postures of humanoids for designated tasks need to be predicted accurately. The present study (1) evaluated the accuracy of driving postures of humanoids predicted by RAMSIS, (2) proposed a method to improve its accuracy, and (3) examined the effectiveness of the proposed method. The driving postures of 12 participants in a seating buck were measured by a motion capture system and compared with their corresponding postures predicted by RAMSIS. Significant discrepancies (8.7° to 74.9°) between predicted and measured postures were observed for different body parts and driving tasks. Two methods (constraints addition and user-defined posture) were proposed and their effects on posture estimation accuracy were examined. Of the two proposed methods, the user-defined posture method was found preferred, reducing posture estimation errors by 11.5% to 84.9%. Both the posture prediction accuracy assessment protocol and user-defined posture method would be of use for practitioners to improve the accuracy of predicted postures of humanoids in virtual environments.
조자영(Jayoung Cho),정정림(Jungrim Jeong),연수민(Soomin Yeon),장준호(Joonho Chang),유희천(Heecheon You),김희은(Heeeun Kim) 대한인간공학회 2008 大韓人間工學會誌 Vol.27 No.4
Ergonomic techniques have been required to analyze the effectiveness of functional clothing design improvement in a systematic and analytic manner. The goals of the present study are to: (1) comprehensively and analytically examine the effectiveness of clothing improvement by using the relationship analysis between clothing design components (D) and ergonomic evaluation measures (E) and (2) prove the usefulness of cost-effectiveness analysis for clothing design optimization. The cost effectiveness analysis is comprised of the preliminary evaluation based on expertise and the in-depth evaluation where the D-E relationship analysis is applied. As a result of the cost effectiveness analysis applied to flame-proof clothing, an optimal design was identified by analyzing costs and qualitative/quantitative effects. In the preliminary evaluation, the expected effectiveness of each design alternative on wear efficiency and wear comfort was estimated. In the in-depth evaluation, however, the effectiveness of each design alternative was analyzed by quantitative evaluation in a wearing test using a questionnaire prepared based on the D-E relationship analysis. It was concluded that the D-E relationship analysis and the cost-effectiveness analysis are useful for comprehensive evaluation and optimization of functional clothing design.