Sources, Effects, and Control of Noise in Indoor/Outdoor Living Environments

KyooSang Kim 대한인간공학회 2015 大韓人間工學會誌 Vol.34 No.3

Objective:To study the sources of indoor noise, its effects on human health, noise assessment and regulation through the use of standards, and techniques used to reduce noise. Background: Noise significantly affects the living environment, and there are an increasing number of reports of its impacts on human health. Method: We reviewed domestic and foreign data regarding environmental noise, and examined its effects and the standards used to regulate noise levels. Results: We describe the major sources of indoor noise and suggest possible legal standards, as well as recommended criteria for the control of noise. Conclusion: South Korea has higher legal standards of environmental noise than international standards in terms of threshold values. People in Korea are exposed to various sources of noise, and therefore the reduction of noise is urgently required. Application: Depending on the features of indoor spaces, an appropriate degree of indoor noise can be determined and techniques to reduce excess noise are required.

Comparison of Speech Recognition and Subjective Hearing Handicap in Elderly Listeners as a Function of Degree of Hearing Loss

KyooSang Kim,Subong Kim,Jae Hee Lee 한국청각언어재활학회 2020 Audiology and Speech Research Vol.16 No.2

Purpose: This study aimed to compare objective speech recognition and subjective hearing handicap outcomes as a function of a degree of hearing loss. Methods: 120 elderly listeners participated, ranging in age from 60-83 years. Listeners’ degrees of hearing loss were derived corresponding to a newly proposed World Health Organization hearing impairment grading system. As objective outcomes, word and sentence recognition scores (WRS, SRS) in quiet were measured at an individually determined most comfortable level. The SRS in noise were obtained at 0 dB signal-to-noise ratio. The Korean Evaluation Scale for Hearing Handicap questionnaire for non-hearing aid users was used to evaluate the effects of hearing status on social and psychological aspects. Results: Within the same grading of hearing impairment, listeners tended to show a large individual variability in speech-in-noise recognition and subjective hearing handicaps. Listeners with even mild impairment had more reductions in SRS in noise and more handicaps in an interpersonal relationship compared to normal-hearing listeners. Among the listeners with no impairment or mild hearing impairment, listeners who had poorer sentence-in-noise scores actually showed greater hearing handicaps. The sentence-in-noise scores plus WRS explained the subjective hearing handicap by about 40%. Conclusion: The elderly with normal hearing or mild hearing loss can have reduced communication abilities in background noise, resulting in a negative effect on their social and psychological aspects. It is recommended to conduct the sentence-in-noise intelligibility test and the subjective hearing handicap survey as a standard audiometric measures to confirm the functional communication problems for the elderly.

FEM에 의한 일반냉연강판 및 고장력강판의 피로해석

김규상(Kyoosang Kim),나석찬(Sukchan Na),송준혁(Joonhyuk Song),강희용(Heeyong Kang),유효선(Hyosun Yu),양성모(Sungmo Yang) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

High strength steel was used vehicle body by satisfying environmental regulation and improving fuel ratio. Vehicle body sheets became thin, strong and functional, but it was insufficient to demand design standards of spot weldment in cold rolled steel and high strength steel. This paper presented a method for determining the fatigue life of cold rolled steel sheet EZNCEN and high strength steel sheet HS40R spot weldment used vehicle. We can be gotten the fatigue life of the spot weldments from the MSC/FATIGUE using the finite element method.

휴대용 XRF를 이용한 서울시 학교 내 어린이용

김규상(KyooSang Kim),박현경(Hyunkyung Park),최길용(Gilyoung Choi),임완령(Wanryong Lim),신규진(Kyoojin Shin) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.3

Objectives: Excluding in their homes, children spend most of their time at an elementary school, daycare center, and/or kindergarten. For educational or recreational purposes, they make use of many children’s goods at these places. Some children’s goods contain phthalates and heavy metals with polyvinyl chloride (PVC), so due to their physiological and behavioral characteristics children are exposed to high concentrations of phthalates and heavy metals. This study aims to measure PVC and heavy metals, which are harmful substances in children’s goods which can have an effect on children’s health. Methods: Six samples of children’s goods were selected through cases of detected harmful substances and the results of previous research, including assembly blocks, model toys, household toys, bags, indoor play equipment, and floor mats. The selected items were measured using X-Ray Fluorescence (XRF), and the presence and content of environmentally harmful substances such as PVC or heavy metals in the materials of children s goods were examined. Results: The highest detection rate for PVC was observed in floor mats, and bags and indoor play equipment were higher than other goods in this regard. The highest detection rate for heavy metals was found in bags, followed by indoor play equipment, assembly blocks, household toys, model toys and floor mats. Except for bags containing heavy metals, five goods showed the highest level of Pb compared to other heavy metals. Floor mats contained the highest level of Pb, Cr, and Cu among all goods. Conclusion: Many children’s goods contain PVC and heavy metals, and high levels of heavy metals have been detected in some goods. It is necessary to manage children’s goods to support their health.

무기력계수에 의한 고장력강 및 아연도금강판의 2겹 점용접 피로해석

김규상(Kyoosang Kim),나석찬(Sukchan Na),송준혁(Joonhyuk Song),강희용(Heeyong Kang),유효선(Hyosun Yu),양성모(Sungmo Yang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2

New steel sheet studies were performed by satisfying environmental standard and customer aspiration recently. So galvanized steel and high strength steel ware developed and extensively used in vehicle body, but this caused difficulties to satisfy design standards of spot welded joint. The reasonable fatigue strength analysis of spot welded joints was very important to estimate the reliability and durability of a vehicle. In this paper, Material S-N curves of galvanized steel sheet EZNCEN and high strength steel sheet HS40R ware obtained with lethargy from quasi static tensile-shear test. Fatigue life of 2-lap spot welded joint ware analyses by the MSC/FATIGUE using the finite element method. Than Fatigue life are presented for EZNCEN and HS40R spot welded joint with Dissimilar Material and welding current.

준정적 인장-전단시험에 의한 고장력강 및 일반냉연강판의 피로특성 평가

김규상(Kyoosang Kim),송준혁(johyuk Song),나석찬(Sukcha Na),강희용(Heeyong Kang),유효선(Hyosum Yu),양성모(Sungmo Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

생산요소 관련 제조유연성이 제조성과에 미치는 영향에 대한 실증적 연구

최규상(Choi, Kyoosang),오중산(Oh, Joongsan) 한국경영교육학회 2010 한국경영교육학회 학술발표대회논문집 Vol.2010 No.6

본 연구는 자동차 부품산업과 전자 부품산업에 속한 제조업체들을 대상으로 생산요소 관련 제조유연성들(기능유연성, 기계유연성, 생산방식유연성) 간의 인과관계와 이들이 제조성과에 미치는 영향을 실증적으로 규명하기 위해 진행되었다. 본 연구에서 기능유연성은 작업자들의 다기능숙련 정도로 측정되었으며, 기계유연성과 생산방식유연성은 범주·이질성·이동성·균일함과 같은 네 가지 차원으로 측정되었다. 공장을 분석단위로 구조방정식을 이용하여 모형을 추정한 결과, 기능유연성은 다른 두 가지 제조유연성에 모두 긍정적인 영향을 미치는 것으로 확인되었다. 또한 기능유연성과 생산방식유연성은 모두 제조성과에 긍정적인 영향을 미치는 것으로 판명되었다. 반면 기계유연성은 예상과 달리 제조성과에 통계적으로 유의한 영향을 미치지 못하는 것으로 확인되었다. 따라서 기업은 기능유연성이나 생산방식유연성과 같은 무형의 생산요소와 관련된 유연성을 제고함으로써 제조성과를 개선할 수 있을 것으로 기대된다. The main purpose of this study is to investigate the causal relationships among functional flexibility, machine flexibility, method flexibility and manufacturing performance. The data of this study were collected from manufacturing companies operated in the automotive and electronic parts industries. Functional flexibility was measured by the degree of a worker's multi-skilling. Machine and method flexibilities were measured by four dimensions: range-number, range-heterogeneity, mobility and uniformity. The proposed relationships were tested at the factory level by using structural equation modeling. As anticipated, the results of this study suggest that functional flexibility has a positive effect on other manufacturing flexibilities. In addition, both functional and manufacturing flexibilities have positive influences on manufacturing performance. However, the effect of machine flexibility on manufacturing performance was not statistically significant. The findings of this study suggest that companies can improve their manufacturing performance by facilitating flexibilities ofintangible manufacturing resources such as functional flexibility and method flexibility.

Motivation to Lead and Shared Leadership in Teams

Zeynep Giraylar(Zeynep Giraylar ),Kyoosang Choi(Kyoosang Choi) 한국자료분석학회 2023 Journal of the Korean Data Analysis Society Vol.25 No.1

More companies have started to adopt a model of self-managed team as their primary work design. As work environments get more complex, an appointed leader alone cannot fulfill all the necessary leadership responsibilities of a team. In this manner, the shared leadership within a team is of great importance for today's work environments. The primary purpose of the present study was to examine an antecedent of shared leadership. Focusing on leadership motivation, this study investigated how team members’ motivation to lead affects shared leadership of the team. This study also examined the effects of shared leadership on team performance using an objective team performance measure, which little previous studies have investigated. Data were obtained from 57 teams consisting of 3 to 5 members. They performed a computer-based business strategy game. Findings showed that the teams consisting of members with a high level of motivation to lead scores were positively related to shared leadership and shared leadership significantly predicted team performance. Theoretical and practical implications of this study are also discussed.

經營經濟學의 發達에 關한 小考

李揆相 연세대학교 대학원 1973 원우론집 Vol.1 No.1

Das Handelswissenschaft ist der Versuch, die Ordnung und das Handelswesenform zu finden, die wir zum 19 jahrhllndertzeit halten. Und was ist Betriebswirtschaftslehre? Sie umfassen alles, was zur Deckungsbeschaffung notwendig ist; der Versuch die verschiedencn Ansichten und Untersuchen u¨ber dem Unternehmen unter einen Hut zu bringen. Dieser Artikel versucht, am Beispiel von 19 jahrhundertzeiten ma¨nnern und derer betriebswirtschaftslehren Wirken im ganz allgemeinen Sinne darzuatellen. Die methodologishe Grundprobleme dieser Aufsatz stutzen auf den theorien von Prof. Mixter, prof. Bellinger und prof. Mellerowicz. Und am Schlub behandelt die Einflußen von Americanbetriebswirtschaftslehre.

리더의 조직풍토에 대한 통제수준이 리더십 로맨스에 미치는 영향

강희경(Heekyung Kang),최규상(Kyoosang Choi) 대한리더십학회 2018 리더십연구 Vol.9 No.4

Why do followers over-attribute to their leaders for organizational performance? We have built a conceptual model based on the fact that followers tend to attribute to the organization’s leadership because leaders control the determinants of the organizational outcome. With our prism into the romance of leadership based on attribution theory of leadership, we worked on how the romance of leadership is subject to the level of control/influence of leaders in relation to the organizational climate that affects its performance. The leaders’control of organizational climate influences the action and attitudes of organizational members and then affects organizational performance. Our study intends to diversify the future one in the romance of leadership theory by further looking into the leadership attribution strength through the level of organizational control over organizational climate. We may need to intensify the romance of leadership for sustaining followership, but excessive leadership control may undermine the initiatives and creativity of organizational members. Thus, our study suggests the necessity of a “right” structural outfit that prevents such negative effects. 조직성과의 원인을 리더에게 과도하게 귀인하는 현상인 리더십 로맨스는 왜 나타나는가? 본 연구는 조직성과의 결정요인들을 통제하거나 조절할 수 있는 영향력을 리더십이 갖고 있기에 팔로워의 리더십 귀인현상이 나타날 수 있다는 점에 초점을 두고 연구모형을 제시하였다. 리더십 귀인이론을 토대로 리더십 로맨스 현상을 살펴보고, 조직성과에 영향을 주는 조직풍토에 대한 리더의 통제와 영향력 수준이 팔로워가 지각하는 리더십 로맨스에 어떠한 영향을 미치는지 분석하였다. 리더의 통제 하에 있는 조직풍토는 구성원들의 행동과 태도에 영향을 주어 조직성과의 결과도 달라질 수 있다. 본 연구는 리더의 조직통제 수준을 통해 조직성과에 대한 리더십 귀인 강도를 설명할 수 있는 이론적 논의를 제공 함으로써, 향후 리더십 로맨스 이론을 다각도로 연구하는데 기여하고자 한다. 또한 팔로워십을 지속하기 위해 리더십 로맨스 강도가 증가할 필요가 있겠으나, 리더의 통제수준의 과대 강화로 나타날 수 있는 구성원의 주도성과 창의성의 훼손과 같은 부정적 효과를 방지하는 조직시스템 구축의 필요성을 시사하고자 한다.