Development of an Ultra-Sound Sensor Based Swallow Monitoring System for Dysphasia

Heecheon You(유희천),Younggeun Choi(최영근),Xiaopeng Yang(양샤오펑),Minjae Kim(김민재) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

Ergonomic Design and Evaluation of Ultrasound Probe

Heecheon You(유희천),Nahyun Lee(이나현),Soojin Moon(문수진),Hayoung Jung(정하영),Eunjin Jeon(전은진),Xiaopeng Yang(양샤오펑),Seungju Lee(이승주),Junpil Moon(문준필),Kilsu Ha(하길수) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

양수발전 터빈 Head Cover 수정작업으로 발생한 문제점 분석

채희천(Heecheon Chae) 한국유체기계학회 2018 유체기계 연구개발 발표회 논문집 Vol.2018 No.11

Development and usability testing of an operating manual for a hair-braiding machine

You, Heecheon,Young, Ronda,Lee, Myun W. Wiley Subscription Services, Inc., A Wiley Company 2008 Human factors and ergonomics in manufacturing Vol.18 No.1

<P>The present study applied the concepts and techniques of usability testing to the development of an operating manual for a hair-braiding machine. A preliminary version of the manual was developed in four stages: (1) profiling user characteristics, (2) defining design features of the manual, (3) preparing contents, and (4) designing the format and layout of the manual. In each development stage, design factors, such as user characteristics and operating instructions, were identified and relevant methods, such as user profile analysis and hierarchical task analysis, were applied. The preliminary manual was evaluated by 5 cosmetology students (age, 18 to 25 years; training, 60 to 700 hours) by using various performance and preference measures and surveying opinions of the participants regarding likes, dislikes, and suggestions. Based on the test results, recommendations were made for better usability of the manual and revisions were made accordingly. The design and evaluation process of an operating manual presented in the study would help practitioners to develop a user-friendly manual. © 2007 Wiley Periodicals, Inc.</P>

양수기동시 펌프터빈에서 발생한 이상 굉음에 대한 고찰

채희천(Heecheon Chae),백경민(Gyeongmin Baek) 한국유체기계학회 2019 유체기계 연구개발 발표회 논문집 Vol.2019 No.11

인체측정항목 Coding 시스템 개발

유희천(Heecheon You),이원섭(Wonsup Lee) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11

Objective: 본 연구는 다양한 기관들이 측정한 인체측정 데이터가 효율적으로 관리되고 활용될 수 있도록 인체측정항목들에 대한 coding 시스템을 개발하는 것이다. Background: 인체측정 데이터는 인간공학적 설계를 위해 활용되는 기초 정보로서 국내외의 다양한 기관들에 의해 수집되고 보고되어 왔다. 그러나, 인체측정 항목에 대한 코드화가 되지 않아 인체측정 데이터를 비교하고 유용하게 활용하는데 한계가 있다. Method: 본 연구는 인체측정항목 종류, 분류 및 코드화에 대한 기존 연구를 조사하여 인체측정항목의 특성을 고려한 코드화 방안을 개발하였고 표준화를 추진하였다. Results: 본 연구는 의미성, 구분성, 포용성, 적용성, 확장성의 원칙을 기반으로 인체측정항목의 코드화 방안을 개발하였고, 300여개의 인체측정항목들에 적용되었다. Conclusion: 본 연구에서 개발된 인체측정항목의 코드화 방안은 다양한 인체측정항목들을 적절하게 코드화 할 수 있음을 파악하였다. Application: 본 연구에서 개발된 인체측정항목의 코드화 방안이 인체측정, 데이터 관리, 데이터 활용에 유용하게 활용될 것으로 기대된다.

대학졸업 청년실업과 정신건강의 관계 - 자기회귀 교차지연 모형의 적용 : 대학졸업 청년실업과 정신건강의 관계

신희천(Shin Heecheon),장재윤(Chang Jae-Yoon),이지영(Lee Jeeyoung) 한국사회조사연구소 2008 사회연구 Vol.- No.16

이 연구는 청년실업과 정신건강의 관계를 자기회귀교차지연 모형을 통해 종단적으로 알아보는 데 목적이 있다. 청년들의 실업 및 취업여부가 정신건강에 미치는 영향(노출가설)과 구직자의 정신건강이 실업 및 취업상태에 미치는 영향(선택가설)을 자기회귀교차 지연 모형으로 동시에 분석함으로써, 청년실업과 정신건강의 연쇄적 인과관계를 규명하고자 하였다. 이를 위해 대학 졸업을 전후로 4차례에 걸쳐 정신건강과 실업 및 취업여부를 조사하였다. 국내 대학교 4학년생을 2528명을 대상으로 사전조사(1차 조사)를 실시하고 이후 약 6개월 간격으로 2차 조사, 3차 및 4차 조사를 실시하였다. 네 시점에서 모두 정신건강을 우울ㆍ불안 차원과 부적응 차원으로 측정하였고, 취업시기 이전인 1차 조사를 제외한 2, 3, 4차 조사에서 응답자들의 취업여부를 조사하였다. 이 연구의 주요결과는 다음과 같다. 첫째, 실업과 정신건강의 연쇄적 인과관계를 가정한 자기회귀교차 지연 모형은 매우 높은 모형 적합도롤 보이는 것으로 나타나 정신건강과 실업을 교호적관계로 파악하는 것이 타당함을 시사하였다. 둘째, 노출기설과 선택가설을 경로분석으로 확인한 결과 선택가설을 부분적으로 지지하는 것으로 나타났다. 셋째, 구직초기의 스트레스는 추후의 실업여부와 정신건강 모두를 예측하는 것으로 나타났다. 끝으로 이 연구의 시사점과 제한점 및 추후 연구를 위한 제안점을 논의하였다. This study investigated the longitudinal relationship between mental health and youth unemployment among university graduates using an autoregressive crosslagged model. The purpose of this study is to test two competing hypotheses about the casual relationship between mental health and unemployment. The first hypothesis states that the experience of unemployment influences mental health (exposure hypothesis). In contrast, the second hypothesis argues that the level of mental health causes unemployment (selection hypothesis). An autoregressive crosslagged model was applied to test these two rival hypotheses in a reciprocal sequence process model. To achieve this research purpose, we designed a longitudinal study composed of four surveys at a six-month interval. At all four points, participants were asked to answer a GHQ (General Health Questionnaire) to measure the level of mental health. GHQ consists of depression anxiety and maladjustment subscales. The data from 767 university graduates who identified their employment status was used for final analysis. The results showed that the autoregressive crosslagged model resulted in a fairly good fit to the datal indicating that the reciprocal sequence process between mental health and unemployment seems to be valid. Results from path analysis indicated that selection hypothesis was partially supported. Finally, the initial level of job searching stress was associated not only With the initial mental health but also With the following state of unemployment and mental health. The implications and limitations of this study are discussed and future directions of study are suggested.

Identify Applicable Design for Environment (DfE) Tools at the Early Stages of Product Development

Ali Masoudi,Heecheon You,Suk-Hwan Suh 대한산업공학회 2014 대한산업공학회 춘계학술대회논문집 Vol.2014 No.5

Awareness of people, organizations and societies about environmental impacts has been dramatically increased in last decade. This has caused many firms and practitioners to consider environmental aspects in various areas such as product development, service, and so forth. Nowadays, manufacturing companies have come to the conclusion that making environmentally sustainable products can be their competitive advantage in the global market. To make sustainable products, organizations need to incorporate environmental issues into their product development processes. For this purpose, plenty of Design for Environment (DfE) tools have been developed thus far. Majority of these tools can be applied only at later stages of the product development process for the purpose of redesigning of products. However, the most effective way to consider environmental factors is to integrate these issues at the early stages of the process. Therefore, this paper aims at identifying applicable design for environment tools into the early stages of the product development process. In this paper, seventy-seven design for environment tools were analyzed in-depth in accordance with their fundamental attributes and features, and then were classified systematically. Based on this analysis, applicable design for environment tools into the early stages of the product development were distinguished, and recommended appropriately. Regarding to the findings of this research, only limited number of design for environment tools can be used for the early integration of environmental impacts into the product development process. It is expected that this study will help design for environment practitioners choose a proper design for environment tool for the early introduction of environmental issues, and consequently to design and develop environmentally sustainable products.

Comparison of Genetic Algorithm and Pattern Search Algorithm for Optimization-Based Hand Posture Prediction

Xiaopeng Yang,Heecheon You 대한인간공학회 2017 대한인간공학회 학술대회논문집 Vol.2017 No.11

Identify Applicable Design for Environment (DfE) Tools at the Early Stages of Product Development

Ali Masoudi,Heecheon You,Suk-Hwan Suh 한국경영과학회 2014 한국경영과학회 학술대회논문집 Vol.2014 No.5

Awareness of people, organizations and societies about environmental impacts has been dramatically increased in last decade. This has caused many firms and practitioners to consider environmental aspects in various areas such as product development, service, and so forth. Nowadays, manufacturing companies have come to the conclusion that making environmentally sustainable products can be their competitive advantage in the global market. To make sustainable products, organizations need to incorporate environmental issues into their product development processes. For this purpose, plenty of Design for Environment (DfE) tools have been developed thus far. Majority of these tools can be applied only at later stages of the product development process for the purpose of redesigning of products. However, the most effective way to consider environmental factors is to integrate these issues at the early stages of the process. Therefore, this paper aims at identifying applicable design for environment tools into the early stages of the product development process. In this paper, seventy-seven design for environment tools were analyzed in-depth in accordance with their fundamental attributes and features, and then were classified systematically. Based on this analysis, applicable design for environment tools into the early stages of the product development were distinguished, and recommended appropriately. Regarding to the findings of this research, only limited number of design for environment tools can be used for the early integration of environmental impacts into the product development process. It is expected that this study will help design for environment practitioners choose a proper design for environment tool for the early introduction of environmental issues, and consequently to design and develop environmentally sustainable products.