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Study on Crystallization Kinetics and Thermal Properties of PCF-co-EF/PLA Blends
Han Eol Kim(김한얼),Byeong Uk Nam(김한얼) 한국고분자학회 2018 폴리머 Vol.42 No.4
본 연구는 poly(cyclohexylenedimethylene furandicarboxylate-co-ethylene furandicarboxylate)(PCF-co-EF)와 poly(lactic acid)(PLA)를 블렌드하여 furan 기반의 바이오 복합재 개발을 목표로 하였다. PLA는 순수 PLA(4032D)와 첨가제가 마스터 배치된 PLA(3801X)를 사용하였다. FE-SEM을 통해 서브 마이크론의 구형 도메인 입자들이 복합재 내에 분산되어 있는 것을 통해 상용성을 확인하였고, 열적 물성 분석 및 비등온 결정화 거동 분석을 통해 PLA가 복합재의 결정화 속도를 가속시킨다는 것을 확인하였다. 또한 DMA를 이용한 동적 물성 측정을 통해 복합재의 상용성 및 연성의 향상을 확인하였다. The goal of this study is to develop furan based bio-composites by blending poly(cyclohexylenedimethylene furandicarboxylate-co-ethylene furandicarboxylate) (PCF-co-EF) with poly(lactic acid) (PLA). Two types of PLA are used in this study and one is neat PLA mostly consisting of L-lactide (4032D) and the other is master batched PLA with various additives (3801X). The FE-SEM results showed sub-micron dispersion of the spherical domains in the blends, which indicates compatibility between PCF-co-EF and PLA. The thermal properties and non-isothermal crystallization kinetics shows that the PLA accelerates the rate of crystallization. Dynamic mechanical analysis showed compatibility of the blends and the improvement of ductility of the composites.
Analysis of Ball Landing Locations in Grand Slam Matches of Tennis
( Han Eol Kim ),( Koo In Jung ),( Jeon Gyu Ko ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1
Purpose: This study has the objective in assessing the tactical ball locations where the ball landed in the structural characteristics of the professional tennis. In order to analyze the tactical patterns, the ball locations were collected through the whole match and compared 1st round match with semi-final match. Method: Matches were the first round and the semi-final of Australian Open, both played in 2012 respectively. The method used in the study is the convex hull algorithm which is computing the convex hull of a finite set of points in computation of geometry. The reason that this method was used is to clearly analyze a tactical playing area of ball locations of top ranked tennis players and different varying ball locations of professional tennis player. Result: For the tactics analysis both the court location where the ball landed and the area of shots in each section were considered. However if the shot was a serve or out then the shot was not analyzed, only during rallies. We thought that tactics might change when playing against left or right handed players and when playing in the first round and the semi-final. First, in the first round, both winner and loser showed the highest frequency in section 2 (x: 205.74~411.48cm, y: 891.54~1188.72cm) which was 16.03% of total shots and 15.86% respectively. The second highest frequency for both players were the section 4 (x: 205.7~ 411.48cm, y: 594.36~891.54cm) for winner and the section 12 (x: 0~205.74cm, y: 594.36~891.54cm) for the loser. The occupied area of ball locations for winner in section 2 was 3.763m2 and 3.598m2 for loser in the first round, 13.82% and 12.68% respectively. Second, in the semi-final, winner showed the highest frequency in section 4 as 19.39% of total shots and loser showed the highest frequency in section 3 (x: -205.74~-411.48cm, y: 594.36~891.54cm) as 20.25%. The occupied area of ball locations for winner in section 4 was 5.197m2 and for loser in section 3 as 5.245m2, 10.95% and 10.89% respectively. Conclusion: This study has provided a method for dividing the tennis court into 16 sections for calculating the occupied area of ball locations. There is a significant difference in frequency and percentage between the 1st round match and the semi-final match. However, there is no significant difference in the occupied area of ball locations. Winners tended to show a different strategy depending on the opponent`s performance level or right-handed or left-handed.
Wireless powered wearable micro light-emitting diodes
Lee, Han Eol,Lee, Daewon,Lee, Tae-Ik,Shin, Jung Ho,Choi, Gwang-Mun,Kim, Cheolgyu,Lee, Seung Hyung,Lee, Jae Hee,Kim, Yong Ho,Kang, Seung-Mo,Park, Sang Hyun,Kang, Il-Suk,Kim, Taek-Soo,Bae, Byeong-Soo,Le Elsevier 2019 Nano energy Vol.55 No.-
<P><B>Abstract</B></P> <P>Wearable displays are considered as a bilateral communication tool in the hyperconnected era. Although several electronic clothing display was demonstrated, high power consumption issue still remained. Here, we present wireless powered wearable μLEDs (WμLEDs) with excellent stability. A custom-designed wireless power supply system operated a 30 × 30 WμLED array on a fabric. The WμLED stability was intensively investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. Finally, a passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wireless powered wearable μLEDs (WμLEDs) with excellent stability was realized by a custom-designed wireless energy supply system on a fabric. </LI> <LI> WμLED stability was investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. </LI> <LI> A passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
김한얼 ( Kim Han-eol ),안재홍 ( Ahn Jae-hong ),임형철 ( Lim Hyoung-chul ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
If the participants in construction site safety management perform their duties in accordance with the provisions of the Industrial Safety and Health Act, the burden on safety managers would be minimal. However, the lack of specific work guidelines for each participating entity and the greater responsibility of the safety and health general manager than the management supervisor have resulted in safety managers’ workload being increased due to the problem of management supervisors’ neglect of safety management. In this study, we conducted a survey of the safety manager’s duties and related documents during the construction project initiation, early stages, ongoing work, and disaster occurrence/investigation, and conducted interviews to improve and enhance the division of duties.
김한얼 ( Kim Han Eol ),임형철 ( Lim Hyoung Chul ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Currently, the school-age population continues to decline in Korea due to social factors. On the other hand, the dormitory facilities are constantly being built and renovated. There are many problems such as construction period and on-site waste when constructed with reinforced concrete structures, which are existing construction methods. Accordingly, dormitory facilities shall be constructed using appropriate construction methods. Therefore, in this study, we will collect and organize basic data on the use status and modular system of dormitory facilities and study efficient maintenance and management when modular construction method is applied to dormitory facilities with changing demand.