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Effects on the Tactile Affections of Touch Behaviors and Materials of Vehicle Interior
Jaekyu Park,Kunwoo Park,Jeongil Yu,Jaeho Choe,Eui S. Jung 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10
Objective: This study examines the degree of influence specific tactile properties have by investigating user behavior when the epidermal skin layer comes into contact with various tactile samples. Background: Although there have been various studies on user sensitivity for automobiles, there has not been an in-depth examination of tactile stimulus on users particularly in utilizing a measurement system to evaluate specific tactile properties and how this influences the user. Method: This study observed how the user perceived the concept of roughness and how this perception changed as tactile properties were altered. There was an analysis of variance for subjective roughness of 6 different types of tactile material contacted by 3 specific methods (press, rub and grasp). Results and Conclusion: There was significant difference between the subjective roughness according to different tactile material and touch behavior. However, there was no significant difference between the luxuriousness according to the type of tactile material and touch behavior. Post-hoc analysis results for the different tactile material indicated that subjective roughness was judged differently according to the increase of roughness properties. In addition, subjects could not accurately judge the difference when the size of the tactile material was small even if subjective roughness was high. Post-hoc analysis results of the touch behavior indicated that feeling friction allowed users to easily distinguish pressure, but pressing made users not feel roughness well. Application: This study suggests a tactile guideline for measuring roughness through certain design parameters.
Jaekyu Min,Ji Hoon Park,Hong-Kyun Sohn,Jong Myung Park 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Silicate conversion coating is considered as an alternative to hexavalent chromium conversion coating for corrosion protection of galvanized steels. However, the coating must be treated with hot air afterward in order to obtain a water resistant silicate layer and to increase corrosion resistance of the coating. Moreover, it is difficult to apply the uniform thermal treatments on the large irregular shaped metal parts. Furthermore, the heat treatment is an energy consuming process. In this work, the effects of adding potassium methyl siliconate (PMS) into the silicate conversion coating on the anti-corrosion properties were studied. The silicate coating layers were formed by the simple immersion into the silicate solutions and the subsequent ambient drying at room temperature. It was verified that the addition of PMS increased the temporary corrosion protection ability without the post-thermal treatments. Coating thickness was around 100 nm and K ion was distributed preferentially at zinc-silicate interface. It was proved that the more hydrophobic surface was formed mainly due to the substantial decrease of the concentration of K ion at the coating surface by the addition of PMS. It was a methyl group of PMS that changed the hydrophilic silicate layers into hydrophobic ones. Subsequently, the enhanced water barrier property of the hydrophobic silicate layers increased the corrosion resistance of the silicate-coated galvanized steel.
A Comparison of the Characteristics between Single and Double Finger Gestures for Web Browsers
Jaekyu Park,Youngjae Lim,Eui S. Jung 대한인간공학회 2012 大韓人間工學會誌 Vol.31 No.5
Objective: The purpose of this study is to compare the characteristics of single and double finger gestures related on the web browser and to extract the appropriate finger gestures. Background: As electronic equipment emphasizes miniaturization for improving portability various interfaces are being developed as input devices. Electronic devices are made smaller, the gesture recognition technology using the touch-based interface is favored for easy editing. In addition, user focus primarily on the simplicity of intuitive interfaces which propels further research of gesture based interfaces. In particular, the fingers in these intuitive interfaces are simple and fast which are users friendly. Recently, the single and double finger gestures are becoming more popular so more applications for these gestures are being developed. However, systems and software that employ such finger gesture lack consistency in addition to having unclear standard and guideline development. Method: In order to learn the application of these gestures, we performed the sketch map method which happens to be a method for memory elicitation. In addition, we used the MIMA(Meaning in Mediated Action) method to evaluate gesture interface. Results: This study created appropriate gestures for intuitive judgment. We conducted a usability test which consisted of single and double finger gestures. The results showed that double finger gestures had less performance time faster than single finger gestures. Single finger gestures are a wide satisfaction difference between similar type and difference type. That is, single finger gestures can judge intuitively in a similar type but it is difficult to associate functions in difference type. Conclusion: This study was found that double finger gesture was effective to associate functions for web navigations. Especially, this double finger gesture could be effective on associating complex forms such as curve shaped gestures. Application: This study aimed to facilitate the design products which utilized finger and hand gestures.
Affective Evaluation of Interior Design of Commercial Cars using 3D Images
Kunwoo Park,Jaekyu Park,Sungmin Kim,Jaeho Choe,Eui S Jung 대한인간공학회 2014 大韓人間工學會誌 Vol.33 No.6
Objective: The purpose of this study is to define consumers" affection on the interior design of commercial cars in terms of its design factors: color, embossing and gloss as independent factors. Background: Existing affective studies related to interior of vehicle focus on just sedans. However, there is no affective study about the interior of commercial cars. In addition, it is hard to change levels to which manufactures want. Method: Representative design factors were drawn using ANOVA and SNK analysis and definitive affective vocabularies were drawn using factor analysis. Furthermore, the results of 3D experiment were analyzed using ANOVA and LSD analysis. 3D images for the experiment were made using 3D max program. The experiment revealed that consumers discerned the differences in levels of each design factor and affective vocabulary. Results: The ANOVA revealed that beige color "A" type and non-gloss were the most preferred design in terms of the affective vocabularies and total preference. Conclusion: The result of the experiment may help manufactures to design the interior of commercial cars in the near future. Furthermore, the ANOVA result of affective vocabularies evaluation is expected to suggest a meaningful guideline. Application: The study results may be utilized as a guideline for interior design of commercial cars.
암순응 환경에서 조도수준과 표적크기가 탐지시간에 미치는 영향
박재규(Jaekyu Park),박성하(Sung Ha Park),오현승(Hyun Seung Oh) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4
Effects of dark adaptation have large safety implications. This study was aimed to investigate the effects of varying illuminance and the size of critical detail on visual performance (i.e., time-to-detect) in a dark room environment. While adapting to the dark environment, ten subjects were asked to detect and answer simple numerical expressions under 9 experimental conditions (3 illuminance level × 3 target size). The ANOVA results revealed that the time-to-detect was significantly affected by both of the illumination level and the size of critical detail. As illumination increased from 10 lux to 20 lux, the time-to-detect was significantly declined. For the size of critical detail, 0.5/min size (i.e., equal to 2 minutes of visual angle) resulted in a shorter time-to-detect, as compared to 0.7/min size (i.e., equal to 1.6 minutes of visual angle). Potential applications of this research include the development of design guidelines for illumination and warning signs in poorly illuminated viewing environments.