• 한국정보전자통신기술학회논문지
• /
• 제12권6호
• /
• pp.537-546
• /
• 2019

본 논문에서는 휴대하기 편하고 3D 콘텐츠 제작이 용이한 트윈 카메라 모듈 시스템을 구현하고자 하였다. 제안한 트윈 카메라 모듈 시스템은 2D 스테레오 카메라로 부터 입력되는 영상을 변환하여 3차원 영상으로 출력할 수 있는 시스템이다. 본 눈문에서 제안한 시스템의 성능평가를 위해 Test Platform을 이용하여 좌, 우 두 개의 렌즈로 촬영된 스테레오 입체 영상의 좌, 우 영상 간의 시차에 따른 회전(Rotation), 기울기(Tilt)에 대한 보정을 평가하였다. 또한 SIFT(Scale Invariant Feature Transform) 알고리즘을 이용하여 3D 입체 영상의 거리오차(Depth Error)를 검증하여 트윈 카메라 모듈 시스템의 효율성을 검증하고자 하였다. 본 논문에서 제안한 트윈 카메라 모듈 시스템은 촬영된 영상을 3D 입체 영상과 준비 영상으로 변화하여 외부에 출력하면 각기 다른 3D 입체 영상 제작 방식에 따른 출력장치에 맞춰 디스플레이가 가능하다. 또한 생성된 영상을 준비 영상과 입체 영상을 각기 다른 채널을 통해 출력하여 많은 제품에 적용하기 쉽고 간편하게 3D 입체 영상 콘텐츠를 제작하는데 이용할 수 있을 거라 기대한다.

• 한국안전학회지
• /
• 제31권6호
• /
• pp.45-51
• /
• 2016

The purpose of this study is to investigate the influence of train-induced end rotation of simple supported track girder on the performance of a direct fixation track system (DFTS) in Yeongjong grand bridge. In this study, the influences of deflection of a DFTS and track girder on dynamic rail-track girder interaction forces for the track girder ends currently employed in airport express lines were assessed by performing field tests using actual vehicles running along the service lines. Therefore, the dynamic displacement of rail and track girder and the fastener stress on the center and ends sections of DFTS were measured for two different trains (AREX and KTX) running in Yeongjong grand bridge. A three-dimensional finite element analysis (FEA) model using the time-history function based on the design wheel load was used to predict the train-induced track and track girder displacement, and the FEA and field test results were compared. The analytical results reproduced the experimental results well within about 3-7% difference in the values. Therefore, the FEA model of DFTS on track girder is considered to provide sufficiently reliable FEA results in the investigation of the behavior of DFTS. Using the analytical and experimental results, the influence of train-induced end rotation of simple supported track girder on the interaction behavior of rail and track girder installed on a simple supported track girder ends, i.e., upward displacement of rail-track girder and the fastener stress, was investigated. It was found that the train-induced end rotation effect of track girder was not significantly affected by the upward displacement of rails and the fastener stresses of track girder ends. Further, the interaction behavior of rail and track girder were similar to or less than that of the general railway bridge deck ends, nevertheless the vertical displacement of track was higher than that of conventional DFTS on the general railway bridge. From the results, the dynamic responses of the DFTS on track girder ends were not significantly affected by the safety and stability of DFTS ends.

• 대한토목학회논문집
• /
• 제35권2호
• /
• pp.525-531
• /
• 2015

3차원 실내공간정보에 구축 시 경제성, 효율성 및 정확도 향상을 위한 지상레이저스캐너의 활용이 주목을 받고 있다. 그러나 실내공간정보 구축에 있어 지상레이저스캐너 관측방식과 기존 측량방식 방식에 대한 비교 연구는 미비한 실정이다. 본 연구에서는 설계도면 갱신 및 3차원 실내 모델링에 AMCW 방식 및 direct TOF 방식의 지상레이저스캐너와 토탈스테이션의 작업시간 및 위치정확도를 비교하여 지상레이저스캐너의 효율성과 경제성을 제시하였다. 비교결과, AMCW 방식은 direct TOF 방식에 비해 시간효율성이 뛰어났으며 두 관측값 사이의 RMSE는 ${\pm}1mm$ 수준으로 나타났다. 또한 지상레이저스캐닝 방식은 토탈스테이션 관측방식에 비해 2배 이상의 시간효율성을 보였으며 두 관측값 사이의 RMSE는 ${\pm}3.4cm$로 나타났다. 제시된 지상레이저스캐너를 이용한 3차원 실내모델링의 경제성과 효율성을 바탕으로 향후 3차원 실내공간 정보 구축에 지상레이저스캐닝 방식이 효과적으로 활용될 수 있을 것으로 기대된다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제39권9호
• /
• pp.923-928
• /
• 2015

FDS는 화재분석에 가장 많이 사용되는 프로그램 중 하나로 정확한 분석을 위하여 적정격자 선정이 필요하다. 이 연구에서는 적정격자 선정을 위하여 다양한 격자 종횡비(AR)를 선정하여 FDS v 6.1.2로 분석하였다. 계산시간은 온도 등의 변화로부터 시간평균값을 구하는데 충분히 긴 10분으로 설정하였다. 그리고 온도와 가시거리, 질량수지의 시간평균값은 준정상상태를 유지하는 200~600초 구간의 값으로부터 구하였다. 그 결과 $10{\times}10{\times}3[m^3]$와 $20{\times}20{\times}3[m^3]$의 두 공간에 각각 1 [MW]와 2 [MW]의 폴리우레탄 화재가 발생했을 때 종횡비 1~6에 대한 열방출률과 온도, 가시거리, 질량수지를 비교하였다. 열방출률은 종횡비와 공간의 크기 및 화재규모에 무관하게 정확함을 확인하였다. 또 $AR{\leq}5$에서는 준정상상태의 온도와 가시거리가 잘 예측되었다. 그러나 종횡비의 증가에 따라 온도의 감소폭이 증가하였고, 질량보존의 만족도가 떨어졌다. 따라서 화재 초기의 온도와 가시거리가 중요한 요소인 성능위주설계에서 $AR{\geq}3$인 경우에는 격자크기에 대한 세심한 검토가 필요함을 확인하였다. 높은 정확도가 요구되는 구획화재 시뮬레이션에는 수직방향 격자크기 0.1~0.2 [m] 이하와 종횡비 2 이하의 격자크기가 바람직함을 알 수 있었다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제39권7호
• /
• pp.773-778
• /
• 2015

지구 환경오염문제가 대두되면서 세계 각국에서는 환경오염을 최소화하려는 움직임이 활발히 이루어지고 있다. 국제해사기구(IMO)에서는 해양 대기오염의 상당량이 선박에서 배출되는 배기가스에 의한 것으로 판단하고 있다. 이에 따라서 선진국을 중심으로 선박관련 환경규제 및 선박배기가스 배출기준이 점차적으로 강화되어 가고 있으며, 관련 기술개발이 급격하게 이뤄지고 있다. 본 연구에서는 연료유 스크러버에 사용되는 노즐개발 및 분사노즐의 위치 선정을 위해 실험용 스크러버에서 PIV 실험을 통하여 노즐의 분사속도는 20.1 m/s, 분사각은 $66^{\circ}$을 확인을 하였다. 또한, CFD 해석을 통해 실험값과 비교 하였으며, 이 노즐을 실증 모델 스크러버 사이즈에 적용하여 스크러버에 고르게 분사시키기 위하여 여러 케이스를 적용하여 CFD해석을 진행하여 노즐의 위치를 선정 하였다.

• 한국터널지하공간학회 논문집
• /
• 제19권4호
• /
• pp.567-576
• /
• 2017

본 연구에서는 지반보강용 시멘트-페이스트에 초음파를 조사하여 온도변화, 점도, 일축압축강도, 육안관측 시험을 통해 초음파가 시멘트-페이스트에 어떠한 물리적 특성을 변화시키는지에 대하여 고찰하였다. 실험에 사용된 w/c는 50~100%까지 다양하게 진행하였으며, 그라우트재의 온도변화는 ${\pm}2^{\circ}C$내에서 범위를 벗어나지 않도록 조절하여 실험을 진행하였다. 실험결과 온도변화는 초음파 조사시간에 비례하여 일정하게 증가하였고, 초음파를 조사한 지반보강용 시멘트-페이스트 점도는 최대 40%까지 감소하는 것으로 나타났다. 일축압축강도는 평균 30% 증가하였으며 육안관측시험에서도 초음파를 조사한 시멘트-페이스트의 단면이 공극이 많이 감소하는 양상을 보였다.

• 유통과학연구
• /
• 제14권7호
• /
• pp.71-81
• /
• 2016

Purpose - Because creativity, which is an intangible resource embedded within the company, can offer a competitive advantage, most companies have an interest in promoting creativity among their employees and division(e.g., marketing organization). Creativity renders a sustainable competitive advantage to a firm because it is a strategic resource that is valuable, flexible, rare, and imperfectly imitable or substitutable. Although most companies broadly recognize the importance of creativity, the methods for developing creativity remain elusive. Therefore, the present study investigates how to structure incentives to motivate employees to be more creative and how to develop tools to facilitate creativity. In detail, the present study aimed to examine the relationship between the regulatory focus of marketing organizations(e.g., promotion focus vs prevention focus) and creativity of marketing organizations. In addition, the present study set out to examine the moderating role of interaction of financial reward and creative training in addition to investigating the direct relationship between creativity and regulatory focus in New Product Development(NPD) context. Research design, data, and methodology - The data used to test the hypotheses are drawn from a survey of full time NPD project members(including project manager, designer, engineer, and marketer). The present study utilized data obtained mainly from a database compiled by the Korea Investors Service-Financial Analysis System which provides comprehensive corporate and financial information on firms listed on the Korea Stock Exchange. A study population comprising 1,000 South Korean firms was obtained from this database. We selected 864 firms from the database, and the firms have experiences of new product development project. We collected a total of 162 responses, for a 18.8% response rate. After we excluded 14 questionnaire because of incomplete responses, a total of 148 questionnaire remained(final response rate: 17.1%). Working with a sample of 148 responses in South Korea, hierarchical moderated regression is employed to test research hypotheses(

The relationship between promotion focus and creativity of marketing organization,

The relationship between prevention focus and creativity of marketing organization,

The moderating effect of joint influences(interaction between financial rewards and creativity training) on the relationship between promotion focus creativity of marketing organization,

The moderating effect of joint influences(interaction between financial rewards and creativity training) on the relationship between prevention focus creativity of marketing organization). SPSS 18.0 and AMOS software were used in the data analysis. Results - The empirical study confirmed that promotion focus of marketing organization is positively related to creativity of marketing organization. Also, prevention focus of marketing organization is positively affected to creativity of marketing organization. In addition, the interaction between financial rewards and creativity training moderated the relationship between regularity focus(e.g.), promotion focus vs prevention focus) and creativity of marketing organization. These results suggest that managers can improve the performances of their creative efforts by providing the use of financial rewards and creativity training in combination. Conclusion - Based on results of this study that examine the effects of regulatory focused creative efforts on creativity of marketing organization, promotion focus is helpful with marketing organizations to enhance their service innovation and performance. Prevention focused organization should allow monetary rewards and creativity training to increase their creativity for innovation of new products.

• 유통과학연구
• /
• 제16권7호
• /
• pp.77-86
• /
• 2018

Purpose - In the insurance distribution channel, the salespeople plays a role of representing the company, and recognizes the needs of the customers and plays a role in responding to them. Therefore, their turnover can have a great influence on the company performance. The purpose of this study is to investigate the structural relationship between salespeople's personal - environmental fit and organizational commitment and turnover intention. Research design, data, and methodology - Data collection was conducted a self-filling questionnaire for salespeople for about one month from July 24, 2017 to August 30, 2017. The subjects of the questionnaire were the insurance salespeople who work in the sales line such as K life, S fire. A total of 450 copies were distributed and 432 copies of the questionnaire were used for final analysis. The analysis program used SPSS 22.0 and AMOS 22.0 programs. Analysis method was Frequency Analysis, Reliability & Confirmatory Factor Analysis, Correlation Analysis and Structural Equation Model(SEM). Results - As a result of Hypothesis 1, Person-Supervisor Fit had significant influence only on Continuance Commitment. Person-Job Fit did not have a significant effect on Organizational Commitment. Person-Coworker Fit had a significant effect on Continuance Commitment and Affective Commitment. Person-Organization Fit had a significant impact on Affective Commitment. Therefore, only , , , , were adopted. As a result of Hypothesis 2, Continuance Commitment had a significant effect on turnover intention. Therefore, only was adopted. Conclusions - This study suggests that it is necessary to manage the human resources in the sales field through studies related to salespeople's extension of the research scope and salespeople's turnover intention. Based on the results of this study, the conclusion suggests some implications for the efficient human resources management of insurance companies in sales channels. It is expected that it will be helpful for the salespeople to find out what kind of Person-Environment Fit affects the organizational commitment and how to manage the organizational commitment among the three dimensions of organizational commitment to reduce turnover intention.

• 한국지능시스템학회논문지
• /
• 제26권5호
• /
• pp.416-422
• /
• 2016

수많은 플라스틱이 산업분야에 다양하게 사용되어지고 있다. 또한 많은 양의 플라스틱 폐기물들이 발생하고 있다. 재활용에 대한 연구는 환경오염 뿐만아니라 한정된 유용한 자원이 버려지는 것을 방지하기 위해 중요한 이슈로 부각되고 있다. 이렇기 때문에 폐플라스틱의 재활용은 재사용 관점에서 주목받고 있는 실정이다. 현재 재활용 센터에서는 플라스틱의 재질을 분류하기 위해 NIR 센서를 이용한 플라스틱 자동 분류 시스템을 구축 및 운용하고 있다. 하지만 흑색 플라스틱은 여전히 분류가 되지 않는 도전적인 목표로 남아있다. 카본 블랙이 포함된 흑색 플라스틱의 경우 검정색의 특성상 NIR 장비에서 나오는 빛을 흡수하기 때문에 분류에 어려움이 있다. 본 연구는 NIR 장비 대신 흑색 플라스틱을 분류하는 방법에 대한 연구이다. 흑색 플라스틱의 정성적, 정량적 분석을 위해 Raman 분광법을 사용하였다. 또한 분류기의 인식률을 높이기 위해 데이터를 특성을 분석하고 흑색 플라스틱을 좀 더 확실하게 분류하기 위해 Support Vector Machine(SVM), 주성분 분석법(PCA) 같은 알고리즘을 이용하였다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제15권6호
• /
• pp.838-843
• /
• 2002

The objectives of this study were to examine growth performance and meat quality by three different feeding patterns in Korean native cattle (KNC). In each of 3 years, fifteen KNC were randomly assigned in a (3 feeding management)${\times}$(3 sex) factorial design experiment; thus, in total, there were 5 animals in each of the 9 treatments. The three feeding management treatments were longterm (24 month) restriction feeding (LTFR), long-term restriction feeding-hormone implant (LTFR-tH), and short-term (18 month) nonrestriction feeding (STFNR). Three sexes were bull, steer, and heifer. Concentrate diet was fed restriction-feeding method based on body weight in LTFR and LTFR-tH. However, the diet was fed ad libitum in STFNR. Hormonal implantation was made three times with M-$PO^{TM}$ for bulls and with F-$TO^{TM}$ for heifers at 18, 20, 22 month of age in LTFR-tH. Animal were purchased from the local cattle market and managed in two local farms and at the university research unit. Animals were slaughtered at 24 months for long-term trial and at 18 month for short-term trial. The growth rate was the highest in bulls and the lowest in heifers. However, the differences were diminished in F-$TO^{TM}$ implanted heifers. The average daily gain was high in STFNR due to ad libitum feeding. The carcass grade was similar among the treatments on percentage bases. Hormonal implants improved significantly the meat quality grade in all sexes. Castration increased body fat content and improved meat quality grade by intramuscular fat deposition. In conclusion, long-term feeding and hormone treatment increased meat quality grade more than short-term feeding. However, ADG was higher in the short-term trial although feedefficiency was lower.