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박기범(Kibum Park),이강승(Kangseung Lee) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
본 논문은 디지털 영상 데이터를 대상으로 웨이블릿 변환을 이용하여 주파수 영역에서 워터마크를 삽입하는 블라인드 워터마킹 알고리즘을 제안한다. 각기 다른 다양한 디지털 영상 데이터의 특성을 고려하여 영상의 특성을 반영하는 임계값을 적용하고 가우시안 랜덤 수열(Gaussian Random Sequence)을 워터마크로 삽입하여 원본영상과 워터마킹된 영상이 시각적으로 차이가 없도록 한다. 영상의 특성을 반영하기위한 임계값을 실험을 통하여 조절함으로서 영상의 손실정도, 워터마크 정보의 삽입 양, 검출 상관도 등의 관계를 연구하고, 인간의 시각적인 특성을 고려하여 비가시도를 향상하였으며 중주파 대역에 워터마크를 삽입함으로서 원본영상의 손실을 최소화하고 다양한 영상 처리에 견고하도록 하였다. 제안한 방법의 성능평가를 위해서 JPEG 손실압축, 선형 필터링, 비선형 필터링, 잡음첨가 그리고 크로핑 등의 영상 처리를 실험한 결과 높은 상관도와 견고함을 나타내었고 비가시도 측면에서도 시각적으로 인지할 수 없을 만큼 측정되었다.
자동차 센터페시아 디스플레이의 감성적 설계: 지역별 선호를 중심으로
박기범(Kibum Park),정의승(Eui S. Jung),임영재(Youngjae Im) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3
Objective: This study is primarily aimed at examining regional affections to automotive center fascia displays. Background: Design research continues to systematize affection to enhance affective quality for automotive users. As self-driving technology progresses, the amount of information exchanged between the driver and the vehicle increases rapidly, making the center fascia display larger and more diverse. As a result, the direction of research reflecting customer affection in the design of existing automotive interior package elements needs to be studied in guideline with the new design trend in the center fascia. Method: A total of nine products were tested for affection, taking into account three display types, after selecting 22 affective words. Based on this, the three affective factors of each display type were derived by analyzing factors, and the MDS and MANOVA analysis was conducted to analyze the dimensions of the affective factors after conducting an affective evaluation of the nine products using newly formed affective factors and to verify the influence between the nine products, the affective factors and regions. Results: There was a difference in preference affection between regions for display type, while horizontal type was significant for novelty and luxuriousness, longitudinal type was significant for novelty, fanciness and overall preference, and mixed type resulted in significant results for novelty and fanciness. It was derived that product differentiation comes from novelty, fanciness and luxuriousness. Conclusion: Cross cultural affective preference was derived by vehicle center fascia display type considering the result of this study in the final. Application: The results of this study is expected to present a strategic direction related to overall affection to the form of automotive displays.
Analysis of Effects of Segmentation Cracks on Durability Enhancement of APS TBC
Kibum Park(박기범),Damhyun Kim(김담현),Keekeun Kim(김기근),Namgyu Jun(전남규),Jongmin Lee(이종민),Chang-Sung Seok(석창성) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Thermal barrier coating(TBC) is a coating technology used to protect key components of gas turbine from high-temperature operating conditions, and the durability of TBC has emerged as a major issue since the operating temperatures are getting higher for better efficiencies. The failure of TBCs is caused of the thermal stresses either due to temperature change or due to the growth of the oxide layer(thermally grown oxide, TGO) which forms and grows at high service temperature. In this study, the effect of segmentation cracks formed in the TBC on stress reduction and durability improvement was analyzed in detail. Finite element analysis simulating the operating conditions was conducted using a 3D unit cell model for TBC, and the stress and geometry changes of interlayer were investigated. As a result, segmentation cracks inhibited the increases of the interface rumpling during the TGO growth, and also reduced the magnitude of the stress accompanying at this process. Additionally, through the thermal fatigue test, the suppression of increases of interfacial rumpling and improvement of durability were confirmed in the presence of segmentation cracks.
박기범(Kibum Park),반기민(Kimin Ban),정의승(Eui S. Jung),임영재(Youngjae Im) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.6
Objective: The aim of this study is to provide classification of the areas in the Driver"s windshield that will enhance your intuitive understanding. Background: Self-driving vehicles are emerging as a result of technological advances, and the range of human behavior is expanding. The collateral information on driving is increasing, and HUD is coupled with an augmented reality to convey information to the driver. Interference between the actual driving environment and the displayed information can cause distraction. Research is required to find out that which areas in driver"s WS are optimum, preferred and restricted to be displayed when displaying information. Method: Proceeding a test for 9 areas, which is carried out as a classification and grouping of the relevant factors in existing HUD researches, on driver"s side WS. The number of 18 participants have been acted LCT with driving simulator, and being measured by completion time and MCH handling quality. Results: In the intuitive perspective the vertically middle areas were the dominant positions all the time. Also the traffic congestion and participant"s state had affected on the interaction to areas. Conclusion: There are many legal regulations locating the HUD area to the middle on the WS, so this study proposed a secondary solution suggest and designated the worst area on considering LOA. For preparing new era of autonomous car industry, this study proposes the initial classification of the HUD location on driving. Application: Moreover, the purpose of this study is being the basis of the study that founds the groups of the optimum, preferred, restricted HUD areas for the near future with Autonomous Driving.