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- 저자 : Hojae Lee (검색결과 109 건)
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Lee Hojae,Ko Eunju,Lee Sanghoon 한국마케팅과학회 2023 마케팅과학연구 Vol.33 No.4
Consumers consider authenticity a critical factor in fashion brand evaluation, sustainable marketing has become essential in marketing activities. And also sustainable fashion brands is increasing, but literature in this field has focused on general and fast fashion brands, and research on luxury brands is lacking. This study aims to examine the effect of luxury brands’ sustainable fashion marketing activities on authenticity, purchase intention, and brand attitude. It analyzes the effects of article format and marketing activity type and identifies the difference in the interaction between luxury brands’ sustainable marketing types and the authenticity, purchase intention, and brand attitude of fashion companies. Sustainable fashion and raw materials were selected as the final stimuli, and 217 copies of the questionnaire were used for analysis through a specialized research company. It found that authenticity, brand attitude, and consumer purchase intention varied greatly depending on luxury brands’ sustainable fashion marketing types. Authenticity positively affected brand attitude and purchase intention, a positive brand attitude positively impacted purchase intention. This study is significant as it provides basic data on the effects of marketing strategies using authenticity from an academic and practical view, expanding the limited scope of research focused on luxury brands in sustainable fashion.
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Experimental analysis on rheological properties for control of concrete extrudability
Lee, Hojae,Kim, Jang-Ho Jay,Moon, Jae-Heum,Kim, Won-Woo,Seo, Eun-A Techno-Press 2020 Advances in concrete construction Vol.9 No.1
In this study, we examined the relationship among the rheological properties, workability, and extrudability in the construction of concrete structures using additive manufacturing. We altered the component materials (binder type, water-binder (W/B) ratio, sand ratio) to assess their effect on the rheological properties experimentally. The results indicated that the W/B and sand ratios had the largest effect on the rheological properties. In particular, when the sand ratio increased, it indicated that adjusting the sand ratio would facilitate control over the rheological properties. Additionally, we compared the rheological properties with the results of a traditional workability evaluation, namely the table flow test. This indicated the possibility of inferring the rheological properties by using traditional methods. Finally, we evaluated extrusion quantity according to table flow. The extrusion rate was 350 g/s for a flow of 210 mm and 170 g/s for a flow of 130 mm, indicating that extrusion rate increased as flow increased; however, we concluded that a flow standard of approximately 140-160 mm is suitable for controlling the actual extrusion quantity and rate.
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Lee, Hojae,Kim, Jang-Ho Jay,Moon, Jae-Heum,Kim, Won-Woo,Seo, Eun-A Elsevier 2019 Construction & building materials Vol.226 No.-
<P><B>Abstract</B></P> <P>Recently, researches on additive manufacturing (AM) method have been actively carried out as the latest technique for building concrete structures in the construction field. It is known that the additive manufacturing method, also called 3D printing technique, is a method of constructing a structure by printing layers, and the adhesion strength in the interlayer between the layers plays a dominant role in the performance of the structure. In this study, we focused on the formation of interlayer of concrete structure built using additive manufacturing method. In this study, the position of the interlayer was analyzed using the computed tomography (CT) method and the correlation between porosity and tensile bond strength in the analyzed interlayer was tried. As a result of the CT analysis of 13 specimens extracted from the printed specimens, it was confirmed that the porosity was formed high in the interlayer. The porosity of the interlayer was at least 2.15% and 6.66% higher than the average porosity. After analyzing the porosity by CT, the tensile bond strength of the specimens was measured to confirm the tensile bond strength and location of the fracture surface. Tensile bond strengths were 2.58–3.77 MPa with an average of 2.80 MPa using 10 specimens. It was confirmed that all of the fracture surfaces occurred along the interlayer. It was confirmed that there was no correlation between the tensile bond strength and porosity of the test specimens used in this study. Six of the ten specimens failed in the other interlayer, but four specimens failed in the interlayer with the highest porosity. As a result of analysis of the fracture surfaces of six specimens without fracture at the highest porosity, the porosity at the fracture surface was 5.73–9.18%, which was higher by 0.6–3.3% than the average porosity. However, defects occurred during layer output were confirmed from the failure of six specimens. Through this study, we confirmed that the interlayer is the weakest when tensile stress is applied in the perpendicular direction of printing, and that it is necessary to review the defects when applying the printing method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pore distribution in the interlayer analyzed using X-ray Computed Tomography. </LI> <LI> Relationship between pore fraction and position of tensile bond fracture determined. </LI> <LI> Tensile bond strength of 6.27% of compressive strength obtained. </LI> <LI> Weakest layer occurred when tensile stress is perpendicular to printing direction. </LI> </UL> </P>
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Theoretical-Analysis-Based Distributed Load Balancing Over Dynamic Overlay Clustering
Lee, Hojae,Kwon, Beom,Kim, Seonghyun,Lee, Inwoong,Lee, Sanghoon IEEE 2016 IEEE Transactions on Vehicular Technology VT Vol.65 No.8
<P>In multicell networks, unbalanced cell loading can lead to decreased system stability and reduced fairness among serviced users. In this paper, we propose theoretical-analysis-based distributed load balancing (DLB) over dynamic overlay clustering implemented over a multicell network. The proposed system is divided into two parts: DLB and overlay clustering. First, for DLB, we define the long-term expected load after deriving the long-term expected rate in terms of proportional fairness. We then introduce two algorithms: DLB for load dispersion and DLB for edge-rate enhancement (ERE). These algorithms operate in a distributed manner based on mathematical analyses and load balancing characteristics. Second, through overlay clustering, load balancing within each cluster is consecutively performed on neighboring clusters, which enables the algorithm to optimally approximate in a distributed manner. The simulation results show that approximately 90% of the near-optimal performance in terms of load variation and ERE can be achieved with low complexity by using the proposed schemes. In addition, we discuss aspects and tradeoffs of the load balancing system.</P>
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Mutual Interference Analysis of FBMC-Based Return Channel for Bidirectional T-DMB System
Lee, Hojae,Kwon, Beom,Jeon, Donghyun,Kim, Seonghyun,Lee, Sanghoon IEEE 2017 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.66 No.5
<P>In this paper, we investigate an effective scheme for implementing the return channel by exploiting the guard band between orthogonal frequency-division multiplexing (OFDM) blocks for uplink transmission, which enables guaranteeing compatibility with legacy systems. In order to resolve the interference problem between the conventional broadcast channel and the return channel, we employ the filter bank-based multicarrier (FBMC) system. Toward this goal, the mutual interference between the return and OFDM channels is derived as a closed form through numerical analysis. Based on the mutual interference analysis and the channel condition, an adaptive modulation scheme is applied to increase data throughput. Through the simulation, it can be seen that more than 350 (500) kb/s/Channel can be achieved for the channel signal-to-noise ratio (SNR) of 20 dB (30 dB) when the quality of service constraint is lower than a bit error rate of <TEX>${\text 10}^-{\text 2}$</TEX> ( <TEX>$10^-{\text 4}$</TEX>). Consequently, the additional throughput above can be achieved in a given resource without the adverse effect to the legacy systems.</P>
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Combinatorial Orthogonal Beamforming for Joint Processing and Transmission
Hojae Lee,Seonghyun Kim,Sanghoon Lee Institute of Electrical and Electronics Engineers 2014 IEEE Transactions on Communications Vol. No.
<P>Coordinated multiple point transmission (CoMP) technologies have recently been proposed to improve the performance of cell-edge users who suffer strong inter-cell interference. Nevertheless, as more transmitters get involved in cooperation, the complexity associated with the selection of multi-dimensional parameters increases exponentially. In this work, we investigate efficient multi-cell cooperation based on CoMP-joint processing and transmission (CoMP-JPT) with orthogonal beamforming using limited feedback. Through the utilization of combinatorial optimization, optimal user scheduling for joint transmission via multiple transmitters is accomplished, while the computational complexity is significantly reduced. In particular, a generalized beam assignment problem (GBAP) is formulated and solved using a combinatorial algorithm that is generalized in terms of the number of transmitters o\mathcal{B}o. The performance of the combinatorial orthogonal beamforming (COBF) scheme is mathematically analyzed so as to demonstrate its superiority and capability to maintain fairness among users in a multi-cell environment. In the simulation results, a performance gain of more than 50% for cell-edge users is obtained without a loss in the average throughput for the total number of users. In addition, the COBF method can reduce the complexity by more than 60% when compared to the conventional exhaustive search technique.</P>
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Lee, Hojae,Cho, Jae-Leon,Yoon, Eui-Sik,Cho, Myungsug,Kim, Do-Gyeum Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.2
Severe accident scenarios in nuclear reactors, such as nuclear meltdown, reveal that an extremely hot molten core may fall into the nuclear reactor cavity and seriously affect the safety of the nuclear containment vessel due to the chain reaction caused by the reaction between the molten core and concrete. This paper reports on research focused on the type and amount of vapor produced during the reaction between a high-temperature molten core and concrete, as well as on the erosion rate of concrete and the heat transfer characteristics at its vicinity. This study identifies themass fraction and melting temperature as the most influential properties of concrete necessary for a safety analysis conducted in relation to the thermal interaction between the molten core and the basemat concrete. The types of concrete that are actually used in nuclear reactor cavities were investigated. The $H_2O$ content in concrete required for the computation of the relative amount of gases generated by the chemical reaction of the vapor, the quantity of $CO_2$ necessary for computing the cooling speed of the molten core, and the melting temperature of concrete are evaluated experimentally for the molten core-concrete interaction analysis.
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