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- 저자 : Changwook Kim (검색결과 118 건)
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Changwook Kim,Seongjin Yoo,Min-Jun Kim,Sejin Ko,Jeounghak Lee 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
From the standpoint of developing a transformative service to create improvements in collective wellbeing (Anderson & Ostrom, 2015), evidence of a sport–resilience relationship is gradually accumulating in the literature (Kim et al., 2022). Sport management and social science scholars are making considerable efforts to understand how sport entities with transformative services can contribute to consumer resilience—an intervention through a sport consumption experience that affects people’s abilities to cope with adversity (Inoue et al., 2022; MacIntosh et al., 2020). However, little is known about the sport industry and spatial consumer behavior in terms of consumer resilience. Although previous researchers have identified a macro-level association between sport industry and community resilience from a bird's eye view (Kim et al., 2021), it could not determine how and where sport industry at a macro level can be related to individual-level resilience through metaphors of Consumer Desire. Specifically, the spatial patterns of sport consumption (i.e., consumer spatial behavior) can be a result of sport consumer behavior affected by spatial context upon heterogeneous features of sport industry across regions (Kim et al., 2021) in the environment–behavior paradigm (Olsson & Gale, 1968). The macrolevel clustering of the sport industry in a region (environment) can be a community resource to provide individuals with the opportunity for sport consumption (behavior), which promotes the micro-level psychosocial factors for sport consumer resilience (Inoue et al., 2022). Furthermore, recent work illustrates heterogeneous spatial interaction at the regional level of the sport industry and individual-level sport consumption (Kim et al., 2022), suggesting the elaboration of cross-level spatial interaction models (Kim et al., 2021). Accordingly, in this study we aim to not only (a) determine spatially heterogeneous interactions in the association between sport industry and consumer spatial behavior in affecting consumer resilience, but also (b) identify what effect spatial interaction has on cross-level relationships. Using data focused on a multiscale-based nested geographic structure (e.g., individual-level consumption by zip code, county, state, and nation) that could elucidate the sport consumer spatial behavior, We collected multiple types of data from Florida, including the location quotient of the main seven sport industries (e.g., sport facilities) and socioeconomic factors (e.g., social vulnerability) at the county level from secondary sources. In addition, we acquired individual-level data from Qualtrics panels (1,107 Florida residents) to measure sport consumer spatial behavior (e.g., location-based sport consumption experience) and consumer resilience using the Connor-Davidson Resilience Scale. To address spatial interaction and heterogeneity, we used a comprehensive analytical model for global and local spatial analysis, including a spatial multilevel mediation (SMM) model and multiscale geographically weighted regression (MGWR) model. As a result of the SMM model, the county-level cluster of sport facilities affected individual-level participatory sport consumption, which enhanced consumer resilience (cross-level interaction effect). However, considerable spatial non-stationarity appeared in the spatial interaction, indicating interregional interactions in the cross-level effects within a county. The results of MGWR indicated significant spatially heterogeneous patterns in the association between the cluster of sport facilities and participatory sport consumption. That is, it was clarified that the spatial heterogeneous effects of the clustering of sport facilities on sport consumer spatial behavior are associated with consumer resilience. This empirical interdisciplinary work, including sport management, geography, and consumer psychology, advances knowledge of consumer spatial behavior and resilience by demonstrating heterogeneous spatial interactions. Practically, the current study calls for spatial management planning and strategy in sport industry for enhancing consumer resilience through spatial sport consumption, considering spatially varying patterns.
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Jae-Deuk Kim(김재득),JooYong Cheon(천주용),JaeHun Kim(김재훈),JaeWon kim(김재원),Junsoo Kim(김준수),Hyunwook Jun(전현욱),Wonho Kim(김원호),Changwook Ji(지창욱) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Recently, global environmental regulations getting more strict, and hence it is increasing that the interest and investment of automobile companies on the aluminum die casting parts to make light-weight vehicles. Die casting molds are fabricated by the machining of billets of tool steels such as AISI 4140 or H13, in general. But, it has disadvantages like a large material loss and long lead time. Meanwhile, a Wire Arc Additive Manufacturing (WAAM) process could be an alternative fabrication method of the die casting mold. It has advantages such as less material loss, short lead time, easy repair and modification, the chance to make a reinforced mold using dissimilar materials, etc. The 5 Cr - 4 Mo tool steel wire is a commercial tool steel solid wire which designed for the repair and modification of tools and molds. It has superior hot wear resistance and toughness as well as the high strength, thus has high potential to produce die casting molds via the WAAM process. On the other hand, the WAAM process is basically the process that stacking the layers repetitively using a conventional arc welding process based on the designed tool paths by CAD/CAM. Thus, the predictability and the reproducibility of every single layer are the most important core factor to obtain the advantages of the automated WAAM process. Due to its nature, a new process parameter whose named an interpass distance should be considered as well as the conventional process parameters such as current, voltage, travel speed, etc. However, there are lack of researches on the interpass distance of WAAM process. In this research, it was found that the interpass distance greatly affect the arc stability due to arc interference induced by the variation of distance from the prior deposited pass. That is to say that the more arc interference was observed as the less interpass distance was given. This phenomenon had been proven through the analysis of high-speed camera results and the variation in the amount of spatter. Further, it was observed that the interpass distance affects the dimension precision and predictability of automated WAAM process of the 5 Cr - 4 Mo tool steel. And it was found the critical interpass distance that could be utilized in the automated WAAM process of the 5 Cr - 4 Mo tool steel. The effect of the interpass distance on the arc interference would exist unless the interpass distance would be given over 100 %, thus, it is important to find out a point of compromise based on the arc stability, dimension predictability, and reproducibility.
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Yang Tae Jun,Kim Je-Hyuck,Cho Jung Rae,Lee Hee Jun,Kim Kyungmin,Park Jaewon,Choi Sung-Jin,Bae Jong-Ho,Kim Dong Myong,Kim Changwook,Park Dong-Wook,Kim Dae Hwan 한국물리학회 2023 Current Applied Physics Vol.46 No.-
In this study, the degradation mechanism of bottom-gate InGaZnO thin-film transistors (IGZO TFTs) under current stress (CS) was analyzed. The threshold voltage shift (ΔVT) caused by different oxygen flow rates (OFR) and various VGS and VDS combinations was measured and analyzed. In addition, the CS-induced ΔVT was modeled and quantified using the parameters of the multiple stretched exponential functions (MSEF). The quantitative parameters for the lateral field-induced degradation mechanisms were analyzed for each source and drain region. Also, the activation energy (EA) for each mechanism was extracted, and it was confirmed that the donor creation near the drain was caused by oxygen vacancy ionization. Finally, the parameters of subgap density-of-states were extracted using the monochromatic photonic capacitance-voltage (MPCV) method. The proposed physical ΔVT model of IGZO TFT under CS should be helpful in the design of instability-aware circuits.
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Extraction Algorithm for the Feature of the Ringer’s Image
Changwook Kim,Z. Mohy-Ud-Din,Sangheon Lee,Sanghyo Woo,Junghyun Lee,Ilyong Park,Chulho Won,Jin-ho Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
When a patient is under the conditions of injecting ringer’s solution, nurses must carefully check the residual quantity of the ringer’s solution because if the nurses misse the exact time to change the ringer’s solution, sometimes dangerous moments can be occurs, such as influx of air bubbles could enter blood vessels or the blood could be regurgitated into the ringer. Therefore, it is necessary to develop a method to detect residual quantity of the ringer’s solution. In this paper, proposed method for detecting residual quantity of ringer's solution used k-NN (k-Nearst Neighbor) classifier. This algorithm utilized a CCD camera that was applied as a sensor to obtain the image of the ringer's bottle. As a result, the algorithm found the residual quantity of the ringer's solution automatically.
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Kim, Changwook,Park, Youngcheol Institute of Korean Electrical and Electronics Eng 2018 전기전자학회논문지 Vol.22 No.4
In this paper, we suggest a combined cost function to find out the optimal operation of an envelope tracking system, and evaluated its performance with Quadrature Amplitude Modulation (QAM) waveform, with which envelope tracking coefficients for the peak drain efficiency and the bandwidth of power amplifiers are determined. Based on the classical envelope tracking theory, the operation of the supply modulator, which is a key part of the envelope tracking process, is modeled and analyzed mathematically. Then characteristics of the modulator by setting envelope shaping function as a cubic polynomial and sweeping the coefficients of this function was analyzed. By sweeping the coefficients, efficiency and bandwidth at each condition with 64-QAM signal was used to obtain optimal point of the supply modulator. Compared to the conventional shaping functions, the optimized function showed the bandwidth reduction by 12.7 percent point while the efficiency was maintained.
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Kim, Changwook,Yoon, Hee Chang,Kim, Dae Hwan,Do, Young Rag IEEE 2018 IEEE photonics journal Vol.10 No.4
<P>It has been elucidated that the responses to light by the human eye influence not only color and brightness recognition but also physiological aspects such as hormones. Melatonin, which affects human circadian rhythms, is sensitive to the blue wavelength region of light. We have investigated the spectroscopic effects of light from virtual reality (VR) and augmented reality (AR) display devices on nonvisual characteristics by means of an analysis of the spectral power distribution (SPD). The circadian illuminance and melatonin suppression value were introduced as representative figures of merits for spectroscopically evaluating nonvisual characteristics. A VR/AR-like custom-made instrument was used to study how the SPD of the display light source affects nonvisual characteristics. Moreover, using multilayer thin-film filters, optimal conditions for minimizing the change of the visual color characteristics of the display while reducing the influence on the non-visual characteristics are also discussed. For the AR device, we found that its spectrum was mostly affected by external light rather than by the spectrum of the AR display itself.</P>
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Changwook Kim,Youngcheol Park 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.4
In this paper, we suggest a combined cost function to find out the optimal operation of an envelope tracking system, and evaluated its performance with Quadrature Amplitude Modulation (QAM) waveform, with which envelope tracking coefficients for the peak drain efficiency and the bandwidth of power amplifiers are determined. Based on the classical envelope tracking theory, the operation of the supply modulator, which is a key part of the envelope tracking process, is modeled and analyzed mathematically. Then characteristics of the modulator by setting envelope shaping function as a cubic polynomial and sweeping the coefficients of this function was analyzed. By sweeping the coefficients, efficiency and bandwidth at each condition with 64-QAM signal was used to obtain optimal point of the supply modulator. Compared to the conventional shaping functions, the optimized function showed the bandwidth reduction by 12.7 percent point while the efficiency was maintained.
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Seol, Changwook,Jang, Segeun,Kim, Junsoo,Jun, Tea-Sung,Kim, Sang Moon The Royal Society of Chemistry 2018 SOFT MATTER Vol.14 No.47
<P>Herein, we report the fabrication process and the investigation of mechanically stable, flexible and free-standing polymeric membranes with two-level apertures. By using overlapped oxygen inhibition layers (OILs) with variation in diameters of the micro-sized supporting layer, we successfully fabricated the mechanically stable and free-standing polymeric membrane with micro/nano two-level apertures. The nano aperture membrane was stably sustained on the micro aperture membrane with a diameter of 50 μm and 100 μm, but was torn off in the case of 300 μm and 500 μm sized supporting layers. To analyze the results, we propose a simple model to set the criteria of the geometrical features which are mechanically stable during the demolding process. It is worth noting that an appropriate material modulus, length, and thickness of the membrane are required for designing and achieving the robust free-standing hierarchical polymeric membrane.</P>
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