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- 저자 : Hayoung Lee (검색결과 350 건)
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Wafer-scale single-crystal hexagonal boron nitride film via self-collimated grain formation
Lee, Joo Song,Choi, Soo Ho,Yun, Seok Joon,Kim, Yong In,Boandoh, Stephen,Park, Ji-Hoon,Shin, Bong Gyu,Ko, Hayoung,Lee, Seung Hee,Kim, Young-Min,Lee, Young Hee,Kim, Ki Kang,Kim, Soo Min American Association for the Advancement of Scienc 2018 Science Vol.362 No.6416
<P><B>Wafer-scale hBN crystalline films</B></P><P>Although wafer-scale polycrystalline films of insulating hexagonal boron nitride (hBN) can be grown, the grain boundaries can cause both scattering or pinning of charge carriers in adjacent conducting layers that impair device performance. Lee <I>et al.</I> grew wafer-scale single-crystal films of hBN by feeding the precursors into molten gold films on tungsten substrates. The low solubility of boron and nitrogen in gold caused micrometer-scale grains of hBN to form that coalesced into single crystals. These films in turn supported the growth of epitaxial wafer-scale films of graphene and tungsten disulfide.</P><P><I>Science</I>, this issue p. 817</P><P>Although polycrystalline hexagonal boron nitride (PC-hBN) has been realized, defects and grain boundaries still cause charge scatterings and trap sites, impeding high-performance electronics. Here, we report a method of synthesizing wafer-scale single-crystalline hBN (SC-hBN) monolayer films by chemical vapor deposition. The limited solubility of boron (B) and nitrogen (N) atoms in liquid gold promotes high diffusion of adatoms on the surface of liquid at high temperature to provoke the circular hBN grains. These further evolve into closely packed unimodal grains by means of self-collimation of B and N edges inherited by electrostatic interaction between grains, eventually forming an SC-hBN film on a wafer scale. This SC-hBN film also allows for the synthesis of wafer-scale graphene/hBN heterostructure and single-crystalline tungsten disulfide.</P>
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Baekhee Lee,Seunghoon Lee,Hayoung Jung,Jawon Lee,Teukgyu Choi,Mina Lee,Hogeun Kim,Eunha Kim,Hojun Jeon,Youngbum Cho,Seungwoo Seo,Heecheon You 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.11
Objective: The present study is to evaluate satisfaction of vehicle outside door handles (ODHs) by design factor for improving grip comfort. Background: Existing studies have mainly focused on size and/or shape of typical handles (e.g., cylindrical handle); therefore, a specialized research for ergonomic ODH design is needed. Method: Satisfaction (operation, shape, height, width, tilting angle, central radius (R), inside upper R, inside middle R, inside lower R, pressure distribution, and overall satisfaction) by design factor (2-level: section width; 3-level: central R, inside upper R, inside middle R, inside lower R, tilting angle, and section height) were analyzed by applying a Taguchi L18 design (2¹ × 3<SUP>6</SUP>). Design levels by design factor were determined referring to 5 existing ODHs. 18 ODHs developed in the study were relatively evaluated comparing with a reference ODH (0 point) through an 11-point bipolar scale (-5: extremely dissatisfaction, 0: no difference, +5: extremely satisfaction) by twenty participants aged 20s ~ 50s. Results: Section width and inside upper R were significant on satisfaction of ODH. Conclusion: A design guideline for ODH was established considering users’ satisfaction. Application: The design factor evaluation protocol using Taguchi method applied in the study can be applicable to the other vehicle moving handles (e.g., inside door handle, door trim grip handle, door trim pull handle).
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MiYoung Lee,Hayoung Hwang 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
The fashion industry is one of the most labor intensive industries, and employs over 25 million workers in over 100 countries (Reinhard, Schmidt, Rützel, & Zentgraf, 2013). There have been many concerns regarding the poor working conditions of garment workers, including their long working hours, forced overtime, and hazardous working environments, especially in developing countries. In Korea, competition has intensified within the industry with the emergence of global fashion companies, which has caused many fashion companies to move their production bases overseas in search of cheaper labor (Son, 2007). Thus, the labor problems that have arisen in the fashion industry are mostly about low wages and the poor working conditions of production workers. However, what about the labor problems of fashion industry workers other than those in production factories? Lee, Kim, Shin, Yoon, Lee, Chang, Chung, and Choi (2009) noted in their study that white-collar workers in fashion companies in Korea work longer hours, receive fewer benefits, and have a higher turnover rate than workers in other industries. In 2015, the poor working environment and low or absent wages of fashion industry interns came under public scrutiny (Kim, 2015; Kwon, 2016). In addition, there were cases in which body size was specified when hiring fashion designers, which raised the question of discrimination based on physical appearance (Kim, 2015). These employment conditions are important factors that influence fashion design majors entering the job market. Hence, regarding this and the physical body size discrimination of fashion designers in the Korean fashion industry, the aims of this paper are twofold: 1) to examine the present situation of physical discrimination by analyzing fashion companies’ job advertisements and 2) to explore fashion major undergraduates’ opinions about job criteria that indicate potential physical discrimination. Two approaches were used in this exploratory study to examine potential hiring discrimination tied to job applicants’ body size; 1) investigation of job advertisements by fashion companies and 2) focus group interviews with fashion majors seniors or graduates looking for a work as fashion designers. First, job advertisements for fashion designers placed on major fashion recruiting sites (e.g., www.saramin.co.kr, www.fashionscout.co.kr, and http://cafe.naver.com/fashionworking) in 2015 were reviewed to determine the current situation of which physical conditions or specific body measurements are set as job requirements or preferred qualifications when hiring fashion designers (n=201). Next, five focus group interviews with seven university seniors each(n=35) were conducted. No fashion companies that were looking for experienced fashion designers only (n=65) included a physical body-size requirement in the job advertisement. Thus 136 fashion designer interns or entry-level fashion designer advertisements were used in further analysis. According to the analysis of the “job requirements”, among those 136 advertisements, 51.5% required education and only 16.2% required a related major along with education, 10.3% required fitting capable size (e.g. female fitting size 55) and 13.2% even presented detailed body measurements (e.g. height 175–178 cm). Among the “preferred” qualifications mentioned in the advertisements, fitting capable size accounted for 6.6%, detailed body measurements accounted for 2%. Analysis results showed that physical conditions capable of fitting were presented more frequently than major as requirements or preferred qualifications, indicating that physical conditions capable of fitting was one of the most important factors for hiring fashion designers. Based on the five focus group interviews, participants’ opinion toward body size requirements in job advertisements were summarized into five themes: 1) Discontent over the unreasonable standard— “Why do I have to have a model figure to become a fashion designer?”; 2) Adapting to given circumstances— “I will lose weight to become a fashion designer”; 3) Frustration over reality that can’t be changed with effort— “I can lose weight, but I can’t get any taller”; and 4) Setting practical alternatives—“I can be a children’s clothing designer instead of women’s”. Most respondents shared a sense of discontent over such hiring requirements and unreasonable discrimination on the grounds of appearance, but they also showed reluctant acceptance of the unreasonable discrimination practiced by employers in the fierce job market. The physical restrictions set as requirements by fashion companies fundamentally deny opportunities to some applicants. Importantly, the outright specification of a physical condition that cannot be overcome through personal effort or improved by the cultivation of skills as a hiring requirement is an infringement upon personal rights. The fashion industry should make efforts to improve its awareness of fashion designers as specialists equipped with design competencies instead of treating them as fitting models simply to save costs.
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Kang, Minkyung,Lee, Yumin,Jung, Hayoung,Shim, Jun Ho,Lee, Nam-Suk,Baik, Jeong Min,Lee, Sang Cheol,Lee, Chongmok,Lee, Youngmi,Kim, Myung Hwa American Chemical Society 2012 ANALYTICAL CHEMISTRY - Vol.84 No.21
<P>We demonstrate highly efficient electocatalytic activities of single crystalline RuO<SUB>2</SUB> nanorods grown on carbon fiber (CF), i.e., RuO<SUB>2</SUB> nanorod-CF hybrid microelectrode, prepared by a simple thermal annealing process from the Ru(OH)<SUB>3</SUB> precursor at 300 °C. The general electrochemical activity of a RuO<SUB>2</SUB> nanorod-CF microelectrode represents faster electron transfer for the [Fe(CN)<SUB>6</SUB>]<SUP>3–/4–</SUP> couple than that of the bare CF microelectrode which are confirmed from the cyclic voltammetry (CV) measurement. Also, the amperometric response for the H<SUB>2</SUB>O<SUB>2</SUB> oxidation is remarkably facilitated at the RuO<SUB>2</SUB> nanorod-CF microelectrode by not only the enlarged surface area but the high electrocatalytic activity of the RuO<SUB>2</SUB> nanorod material itself. Furthermore, a single microelectrode of RuO<SUB>2</SUB> nanorod-CF exhibits the superior tolerance to Cl<SUP>–</SUP> ion poisoning unlike Pt-based electrocatalysts, indicating the promising sensor candidate in physiological conditions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2012/ancham.2012.84.issue-21/ac302334t/production/images/medium/ac-2012-02334t_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac302334t'>ACS Electronic Supporting Info</A></P>
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( Hayoung Choi ),( Hyun Lee ),( Yeon-mok Oh ),( Sei Won Lee ),( Yun Su Sim ),( Dong-gyu Kim ),( Hyun Kuk Kim ),( Jae Ha Lee ),( Seung Won Ra ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Although respiratory infections, including tuberculosis, are the major cause of bronchiectasis in Asia, there is limited information on the clinical features of bronchiectasis patients with pulmonary tuberculosis (TB) history. Methods: We evaluated 436 bronchiectasis patients enrolled in the Korean Multicenter Bronchiectasis Audit and Research Collaboration (KMBARC) registry between August 2018 and July 2019. We compared respiratory symptoms, comorbidities, lung function, radiologic features, quality of life, exacerbations, and disease severity in bronchiectasis patients with TB history versus those without TB history. Results: Of the patients, 139 (31.9%) had TB history (51.8% [72/139] of whom was diagnosed with post-TB bronchiectasis). Bronchiectasis patients with TB history had lower body mass index (BMI) (22.4 vs. 23.2 kg/m2, P=0.002) and a higher rate of chronic obstructive pulmonary disease (COPD) (48.2% vs. 33.7%, P=0.004) than those without TB history. There were no significant intergroup differences in sputum color and volume, quality of life measured by the bronchiectasis health questionnaire, and other comorbidities. The involvement of right upper lobe (57.9% vs. 35.6%, P<0.001) and left upper lobe upper division (48.8% vs. 32.7%, P=0.002) on chest CT were more observed in patients with TB history than those without TB history. Regarding respiratory medications, bronchiectasis patients with TB history used LAMA/LABA more frequently (35.5% vs. 21.1%, P=0.001) and ICS/LABA less frequently (8.7% vs. 20.4%, P=0.002) than those without TB history. Bronchiectasis severity index (6 vs. 5, P=0.038) was significantly higher in patients with TB history than in those without TB history; however, there were no significant differences in exacerbations between two groups. Conclusion: Bronchiectasis patients with TB history had lower BMI, higher COPD rate, and received LAMA/ LABA more frequently than those without TB history. Despite higher bronchiectasis severity index in patients with TB history, there was no significant intergroup difference in the quality of life and exacerbation rates.
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Lee, Seunghyeon,Lee, Jaemin,Hwang, Hayoung,Yeo, Taehan,Lee, Howon,Choi, Wonjoon Elsevier 2018 Carbon Vol.140 No.-
<P><B>Abstract</B></P> <P>Biporous structures at the nano–microscale are promising candidates for controlling phase change heat transfer, through their enhanced capillary wicking and fluid transportation. However, existing methods for fabricating biporous structures involve complex process which is not suitable for small-scale thermal devices such as heat pipes, owing to their confined and non-flat inner structures. Herein, we report the biporous structures inside copper-sintered heat pipes, enabled by layer-by-layer (LbL) assembled multi-walled carbon nanotube (MWCNT)-polyethyleneimine (PEI) coating for enhanced thermal performance. The repetitive filling and removing of the oppositely charged solutions with MWCNT-PEI and carboxylic-functionalized MWCNTs assembled the nanoporous MWCNT-PEI coatings (10, 20, and 40 bilayers) on the microporous copper-sintered inner surfaces. The fiber-like MWCNT networks structurally manipulated morphology and thickness of biporous structures, while the hydrophilic PEI shells chemically optimized wettability. A reduced thermal resistance (∼14.3%) was observed for MWCNT-PEI coating in 10 bilayers, due to the enhanced capillary wicking, interfacial contact areas, and bubble dynamics, whereas the 40 bilayers did not exhibit improved thermal performance owing to the redundant nanoporous layers causing reduced volume of microporous structures and increased thermal resistance. The LbL-assembled MWCNT-PEI coatings would act as functional layers to improve the performance of miniaturized and thin-film-based thermal devices.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Lee, Wonsup,Lee, Baekhee,Yang, Xiaopeng,Jung, Hayoung,Bok, Ilgeun,Kim, Chulwoo,Kwon, Ochae,You, Heecheon Elsevier 2018 COMPUTERS & INDUSTRIAL ENGINEERING Vol.117 No.-
<P><B>Abstract</B></P> <P>The present study developed a sizing analysis system for head-related product designs based on the Civilian American and European Surface Anthropometry Resource (CAESAR) database of North Americans. A total of 2299 heads in the CAESAR database were manually edited and 26 anthropometric landmarks were marked on the edited 3D heads to measure 30 anthropometric dimensions related to head-related product designs. The 3D anthropometric sizing analysis system (3D-ASAS) developed in the study provides analysis functions of a sizing system and representative face models by considering a target product, a target population, the number of size categories, and key anthropometric dimensions based on the CAESAR head measurements. Further research to reduce the efforts of manual editing and landmarking of 3D body scan data is discussed for efficient application of the 3D-ASAS to the design process of various wearable products.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 2299 heads of the Civilian American and European Surface Anthropometry Resource (CAESAR) were edited for measurement. </LI> <LI> 30 anthropometric head and face dimensions were measured. </LI> <LI> A 3D Anthropometric Sizing Analysis System (3D-ASAS) was developed and applied in head-wearable product design. </LI> <LI> A sizing system of a head-wearable product can be easily found by product designers through simple use of the 3D-ASAS. </LI> </UL> </P>
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