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김기성(Kiseong Kim),B. Vladimir,이춘범(Chunbeom Lee),정재우(Jaewoo Jung),김덕진(Deokjin Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The drop size distribution characteristics of a Common Rail injection system used in HSDI(High Speed Diesel Engine) were investigated with Fraunhofer diffraction type measuring device. The experiments were performed in the high pressure spray test rig at room temperature. The reliability of measured data were analyzed, since the optical concentrations of the conditions were too high. The concentrations of droplets smaller than 4탏 were relatively high, so it showed double peaks in the drop size distribution characteristics.
김기성(Kiseong Kim),한완희(Wanhee Han),윤영한(Younghan Youn),황범진(Beomjin Hwang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently automobile market has been watched with deep concern about environmentally friendly vehicle for reducing environmental pollution. The environmentally friendly vehicle is excellent in energy efficiency ratio and the least vehicle in automobile exhaust fumes. The one of cause is weight in the energy efficiency ratio and exhaust fumes, etc. Because the weight of vehicle is getting heavier, the energy efficiency ratio becomes worse and the amount of exhaust fumes increases. In this paper, the magnesium seat back frame was designed to reduce the weight and improve the strength using sensitivity analysis. The magnesium seat is lighter than formal seat and better in anti-vibration. Also it is excellent for interception of electromagnetic waves, so it will be applied usefully in the electronic automobile. However the maximum stress of magnesium is lower than other material like steel so we studied to satisfy the qualification which is raised the strength and minimized the weight of the seat frame. A primary objective of the study is to develop a new magnesium seat back frame for the passenger car. Back moment analysis of the conventional steel seat frame was conducted as a base model. Back moment strength with the developed magnesium seat back frame were compared to those of the base model. Then this paper describes a study that was conducted to determine sensitivity of several design factors for finding main design factors to light weight and sustain strength as steel frame using the matrix of orthogonal arrays. The design factors that may have major effect on FEM simulations were selected and orthogonal array was set up for analysis. By the design matrix, the magnesium seat frame was analyzed using LS-DYNA. The performance sensitivities of magnesium seat frame are analyzed using Taguchi method. In conclusion, the proper strength was had in the magnesium seat frame with comparison of steel frame and this frame could be reduced the weight about 40% of the steel seat frame.
김세훈(Sehoon Kim),박중민(Jungmin Park),김기성(Kiseong Kim),도유성(Yuseong Do),장명기(Myungki Jang),류승수(Seungsoo Ryu) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
In general, a sport utility vehicle (SUV) vehicle has a luggage room for loading various loads behind a two-row seat of a hatchback vehicle. The luggage room aims to secure maximum space to accommodate more and larger luggage. In some vehicles, partitions and the like are used to increase usability in order to efficiently use the open space. Many vehicles have separate storage spaces, such as trays, at the bottom of the luggage room in accordance with the driver"s usability and in order to facilitate the utilization and convenience of the storage space. The purpose of this study is to develop a new mechanism that provides the intermediate stop function that can be fixed in the hinge without the need for a separate fixed part when the luggage is rotated. Accordingly, it was specified through concept development and analytical design verification, and an evaluation method was developed to verify its usefulness.
무채색 무늬가 포함된 배경색의 파스텔색상에 따른 뇌파반응
이희란,김소영,김기성,홍경희,Lee, Heeran,Kim, Soyoung,Kim, Kiseong,Hong, Kyunghi 한국의류산업학회 2017 한국의류산업학회지 Vol.19 No.5
Recently, consumers' evaluation and purchase of online design has been increasing due to the popularization of designing through personal computers, but there has not been enough studies on consumers' brain wave responses depending on the change of PC monitor's color. Therefore, this study investigated how brain waves changed when different background colors with gray patterns were presented through PC monitors. Six background colors with same tone of slightly low saturation were selected, including ivory, yellow, pink, green, blue and pure white as a base color. The brightness and characteristics of color used were analyzed using the luminance meter and color scales. Brain wave was measured by EEG measurement equipment. Brain wave measurement was carried out with 9 subjects at 6 points: F3, F4, T3, T4, O1, and O2. Stimuli were shown for 15 seconds each and black screens were displayed for 15 seconds between each stimulus. As results, the brain waves at O1 responded sensitively by different background colors, followed by F4 and T4. Brain index such as 'RT', 'RA', 'RG', 'RSA', and 'RAHB' showed significant differences depending on the background color at O1, whereas 'RST' differed at F4. Yellow and blue backgrounds pair was the only stimuli that showed significant differences in six brain indices mentioned. Yellow background had higher value of 'RG' at O1 and higher 'RST' at F4, indicating yellow background enhanced concentration. Blue background activated 'RT', 'RA', 'RSA', 'RAHB' at O1, meaning blue background induced calm and stable state.
통증 두려움과 회피행동의 관계에 금전동기가 미치는 영향
김분옥(Bun-Ok Kim),김기성(Kiseong Kim),신대용(Daeyong Shin),조성근(Sungkun Cho) 대한스트레스학회 2019 스트레스硏究 Vol.27 No.1
본 연구 목적은 통증 두려움이 금전동기에 따라 회피행동에 미치는 영향을 살펴보는 것이다. 건강한 남녀 80명을 대상으로 통증 두려움과 금전동기 조건에 따라 4집단 중 1개 집단에 무선 할당했다. 실험결과, 고-통증 두려움 집단이 저-통증 두려움 집단에 비해 영상 시청과 과제 수행 동안 자율신경계가 더욱 활성화되었다. 또한 통증 두려움과 금전동기 조건에 따라 회피행동에 미치는 상호작용 효과가 유의했다. 저-통증 두려움 집단에서는 금전동기 조건에 상관없이 과제 수행 지연시간에 유의한 차이가 없었던 반면, 고-통증 두려움 집단에서는 금전동기가 높을수록 과제 수행 지연시간이 유의하게 더 짧았다. 본 연구는 수정된 두려움-회피 모형을 지지하는 경험적 증거를 제공하며 경쟁목표 차단 기제의 발현을 실험적으로 증명한다. Background: The purpose of this study was to examine the effects of monetary motivation on the relationship between pain-related fear and avoidance behavior. Methods: Eighty healthy volunteers were randomly assigned to one of four groups in accordance with task conditions of pain-related fear (high or low) and monetary motivation (high or low). Results: The autonomic nervous system was more active in the high pain-related fear group than in the low pain-related fear group as the participants watched a video and performed a task. Also, pain-related fear and monetary motivation had a significant interaction effect on avoidance behavior. High monetary motivation was associated with a shorter delay time during task performance in the high pain-related fear group. No significant difference was observed in the delay time in the low pain-related fear group. Conclusions: This study provides empirical evidence supporting the modified fear-avoidance model and experimentally proves the activation of the goal shielding mechanism.