Temperature Effects in Optical Limiter using Carbon Nanotube Suspensions

Hyojung Yu,Sok Won Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.4

An optical limiter is an optical component that reduces the laser beam intensity for the protection of eyes and light sensors, and a carbon nanotube is known to be a highly efficient optical limiting material. However, the effects of heat generated by continuous use have not been studied yet. Therefore, in this work, the variation of optical limiting effect of multi-walled carbon-nanotube suspensions in several kinds of solvents such as distilled water, chloroform, ethanol and ethylene glycol, were measured in the temperature range from room temperature to the boiling point of each solvent. A pulsed Nd : YAG laser with a wavelength of 1064 nm and a pulse duration of 6 ns was used as the light source. The experimental result shows that the limiting efficiencies of all the suspensions were reduced as the temperature was increased and that a suspension with a solvent of lower boiling point, viscosity, and surface tension showed a higher efficiency.

누에 short neuropeptide F receptor (BsNPF-R)의 cDNA cloning

신효정(Hyojung Shin),권기상(Kisang Kwon),홍선미(Sun Mee Hong),김홍근(Hong Geun Kim),박관호(Kwan-Ho Park),최지영(Ji-Young Choi),김승환(Seung-Whan Kim),유권(Kweon Yu),권오유(O-Yu Kwon) 한국생명과학회 2016 생명과학회지 Vol.26 No.6

누에(Bombyx mori)에서 short neuropeptide F (sNPF) receptor를 encoding하고 있는 cDNA를 cloning하여서 BsNPF-R라고 이름을 붙였다. BsNPF-R는 이미 보고된 sNPF-R들과 아미노산 수준에서 사람(36%), 쥐(34%), 제브라피쉬(35%), 초파리(51%)와 상동성을 보였다. BsNPF-R는 계산적으로 분자량이 42,731 Da이고 원형질막을 관통하는 단백질이다. BsNPF-R 유전자발현은 중장, 후견사선, 말피기관, 정소에서 강한 반면 지방체, 혈세포, 난소에서 약하게 발현하였다. 그리고 합성된 sNPF에 의해서도 BsNPF-R의 유전자발현이 조절되었다. It has already been reported that short neuropeptide F (sNPF) stimulates feeding behaviors in a wide variety of insect species. In the present study, we cloned cDNA, encoding a sNPF receptor homologue from a silkworm, Bombyx mori, named BsNPF-R. The amino acid sequence of BsNPF-R was compared with those of sNPF-R thus far reported, which is shared with humans (36%), mice (34%), zebrafish (35%), and fruit flies (51%), respectively. A BsNPF-R protein"s mass was theoretically estimated to be 42,731 Da and it is a putative plasma membrane-penetrating protein. The mRNA expression of BsNPF-R was tested; the results showed that a strong expression was detected at the midgut, post-silk gland, Malpighian, and testis; however, a weak expression was at the fat body, hemocyte, and ovary. In addition, the synthesized sNPF of a silkworm regulated the BsNPF-R mRNA expression through the cell-based functional analysis.

Functional Domain Marker (FDM): an In Silico Demonstration in Solanaceae Using Simple Sequence Repeats (SSRs)

Yu, Ju-Kyung,Paik, Hyojung,Choi, Jae Pil,Han, Jung-Heon,Choe, Jun-Kyoung,Hur, Cheol-Goo Springer-Verlag 2010 Plant molecular biology reporter Vol.28 No.2

유배우자 여성 노인의 성(Sexuality)에 관한 연구

박효정(Hyojung Park),신선화(Sunhwa Shin),유은주(Eun Ju Yu) 대한여성건강학회 2016 여성건강 Vol.17 No.1

Simultaneously Grasping and Self-Organizing Photoactive Polymers for Highly Reproducible Organic Solar Cells with Improved Efficiency

Cha, Hyojung,Lee, Gang Young,Fu, Yuanhe,Kim, Yu Jin,Park, Chan Eon,Park, Taiho Wiley Blackwell (John Wiley Sons) 2013 Advanced energy materials Vol.3 No.8

주거래은행의 재무성과가 대출기업의 이익조정에 미치는 영향

이효정(Hyojung Lee),이은서(Eunsuh Lee),유소진(Sojin Yu) 한국회계정보학회 2017 한국회계정보학회 학술대회발표집 Vol.2017 No.2

본 연구는 주거래은행의 재무성과가 대출기업들의 이익조정에 미치는 영향을 분석하는데 목적이 있다. 주거래은행의 재무성과는 BIS 자기자본비율과 무수익여신으로 측정했으며 대출기업의 이익조정은 수정존스모형을 적용한 재량적 발생액으로 측정하였다. 연구 분석결과, 주거래은행의 BIS 자기자본비율과 대출기업들의 재량적 발생액은 유의한 양(+)의 관계를 나타냈다. 또한, 주거래은행의 BIS 자기자본비율과 무수익여신은 유의한 음(-)의 관계를 나타냈다. 본 연구는 관계형 금융을 지지하는 분석결과를 보여주고 있으며, 은행의 재무적 성과가 대출기업의 이익조정행태에 중요한 역할을 하고 있음을 시사하고 있다. In this study, we examine the effect of the financial performance of main banks on earnings management of borrowing firms. The BIS capital ratio, the return on equity ratio, and the non-performing loans of main banks are used to measure their financial performance. The modified Jones discretionary accruals is used to measure the earnings management of borrowing firms. Results of this study indicate that the association between discretionary accruals of borrowing firms and the BIS capital ratio of main banks is significantly positive. In addition, the association between discretionary accruals of borrowing firms and the non-performing loans of main banks is significantly negative. Overall, our results support relationship banking, and the financial performance of banks plays a significant role in the earnings management of borrowing firms.

다중벽 탄소 나노튜브 현탁액의 광 리미팅 특성

유효정,김석원,Yu Hyojung,Kim Sok Won 한국광학회 2004 한국광학회지 Vol.15 No.5

광 리미터는 입사광의 세기가 커질때 투과율을 줄여서 눈과 센서를 보호하는 광소자이다. 최근에 높은 효율의 광 리미터 재료로 알려진 다중벽 탄소 나노튜브 분말을 증류수, 클로로포름, 에탄올, 에틸렌 글리콜과 같은 용매에 각각 섞어 현탁액을 만들고 실온에서 용매의 끓는점까지 온도를 변화시키면서 광 리미팅 효율의 변화를 관측하였다. 광원으로는 펄스폭이 6 ns이고 파장이 1064 nm인 Q-스위칭된 Nd:YAG 레이저 펄스를 사용하였다. 관측 결과, 다중벽 탄소 나노튜브 현탁액의 온도가 증가할수록 광 리미팅 효율이 나빠졌고 현탁액 용매의 끓는점, 점도 그리고 표면장력 값이 낮을수록 광 리미팅 효율이 좋아짐을 확인하였다. The optical limiter is an optical component which reduces laser beam intensity for the protection of eyes and light sensors. Carbon nanotube is now known as a highly efficient optical limiting material. Optical limiting effect of the multi-walled carbon nanotube suspensions, in several kinds of solvents such as distilled water, chloroform, ethanol and ethylene glycol, were measured in the range from room temperature to near to the boiling points of the solvents. The pulsed Nd:YAG laser whose wavelength is 1064 nm and pulse duration is 6 ns was used as a light source. The experimental result shows that the limiting efficiency was reduced as the temperature increased, and the suspension which has lower boiling point, viscosity and surface tension has highest efficiency.

Amorphous Thieno[3,2-<i>b</i>]thiophene and Benzothiadiazole Based Copolymers for Organic Photovoltaics

Lee, Wonho,Cha, Hyojung,Kim, Yu Jin,Jeong, Ji-Eun,Hwang, Sungu,Park, Chan Eon,Woo, Han Young American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.22

<P>Three types of amorphous thienothiophene (TT)-benzothiadiazole (BT) based copolymers (<B>PFTTBT</B>) were synthesized by incorporating alkyl-substituted fluorene moieties as a third component in the polymer backbone. Their optical, electrochemical, morphological, and photovoltaic properties were examined by a comparison with those of a crystalline TT-BT derivative (<B>PTTBT14</B>). <B>PTTBT14</B> was reported to have a high hole mobility (0.26 cm<SUP>2</SUP>/(V s)) due to the pronounced interchain ordering but poor photovoltaic power conversion efficiency (PCE) of 2.4–2.6% was reported due to excessively strong self-interactions with poor miscibility with fullerene structures. By incorporating fluorene units, the UV–vis spectra showed an increased bandgap (∼1.9 eV) with the disappearance of the packing-originated shoulder peak, and the valence band decreased compared to crystalline <B>PTTBT14</B>. The amorphous <B>PFTTBT</B> polymers showed substantially improved photovoltaic properties compared to <B>PTTBT14</B>, even though they showed poor hole mobility (∼10<SUP>–6</SUP> cm<SUP>2</SUP>/(V s)) and fill factor. The optimal devices were achieved by blending with excess PC<SUB>71</SUB>BM (polymer:PC<SUB>71</SUB>BM = 1:4 by weight), showing little improvement in the thermal and additive treatments. Under simulated solar illumination of AM 1.5 G, the best PCE of 6.6% was achieved for a <B>PFehTTBT</B>:PC<SUB>71</SUB>BM device with an open-circuit voltage of 0.92 V, a short-circuit current of 15.1 mA/cm<SUP>2</SUP>, and a fill factor of 0.48. These results suggest that it is useful to disrupt partially the interchain organizations of excessively crystalline polymers, enabling fine-control of intermolecular ordering and the morphological properties (i.e., miscibility with fullerene derivatives, etc.) to utilize the advantages of both crystalline and amorphous materials for further improving PCE of polymer solar cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-22/am5061189/production/images/medium/am-2014-061189_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5061189'>ACS Electronic Supporting Info</A></P>

A gap filled reference genome sequence for Korean native radish (Raphanus sativus L. Bakda!)

Han Yong Park,Yu-jin Lim,Myunghee Jung,Hyojung Son,Sathiyamoorthy Subramaniyam,Seong Ho Heo,Byeong Jun Park,Younhee Shin 한국육종학회 2023 한국육종학회 공동학술발표집 Vol.2023 No.-

한국과 일본 중학교 가정교과서 ‘소비생활’ 관련 단원의 지속가능발전교육(ESD) 구성개념 비교

유난숙(Nan Sook Yu ),정효정(Hyojung Jung) 한국가정과교육학회 2023 한국가정과교육학회지 Vol.35 No.2

본 연구의 목적은 한국과 일본의 현행 중학교 가정교과서 ‘소비생활과 자원관리’ 관련 단원을 지속가능발전교육(ESD) 구성개념(다양성, 상호성, 유한성, 공평성, 연계성, 책임성)을 기준으로 분석하여 두 나라 중학교 가정교과서에 ESD 구성개념이 어떻게 반영되었는지 비교 분석하는 데 있다. 분석대상은 한국과 일본 각 세 개 출판사에서 발간된 가정교과서(총 6개 출판사)의 ‘소비생활과 자원관리’ 분야의 교육내용으로, 한국 교육과정 내용요소 ‘청소년기의 소비생활’, ‘청소년의 자기 관리’, 일본 교육과정 내용요소 ‘금전의 관리와 구입’, ‘소비자의 권리와 책임’과 관련된 단원이 이에 해당된다. 현행 중학교 가정교과서 ‘소비생활과 자원관리’ 관련 단원에 ESD 구성개념이 얼마나 반영되었는지 분석한 결과, 한국의 경우, 책임성(23.36%)이 제일 많이 반영되었으며, 상호성(22.43%), 연계성(19.63%), 공평성(18.69%), 유한성(10.28%), 다양성(5.61%) 순으로 반영되었다. 반면, 일본의 경우, 연계성(21.74%)과 상호성(21.45%)이 많이 반영되었으며, 공평성(16.23%), 책임성(13.91%), 유한성(13.33%), 다양성(13.33%) 순으로 반영되었다. 한국의 경우 ESD 구성개념별로 반영된 비율이 서로 차이가 많이 난 반면, 일본의 경우 연계성과 상호성 외에 다른 ESD 구성개념이 대체로 골고루 반영되었다. 한국의 교과서에서는 합리적이고 윤리적인 소비생활을 실천하는 면에서 책임성을 많이 강조하였다. 일본의 교과서에서는 소비자단체를 통한 소비자 문제 해결 및 지원, 환경 문제 해결을 위한 지역사회 및 국제사회의 협력 등을 다룬 점에서 연계성을 많이 강조하였고, 개인과 가족의 소비 행동이 사회, 경제, 환경에 미치는 영향을 다룬 점에서 상호성을 많이 강조하였다. 결론적으로, 한국과 일본 가정교과서에 지속가능성을 실현하는 소비자를 키우기 위한 요소들이 반영되었다는 것을 확인할 수 있었다. This study aimed to analyze ‘consumer life’ units in middle school home economics textbooks in Korea and Japan based on the ESD concept (diversity, interaction, finiteness, fairness, cooperation, responsibility). The objective was to compare how the ESD concept was reflected in Korean and Japanese textbooks. The analysis focused on the units related to ‘adolescent consumer life’ in Korean textbooks and ‘money management and purchase’ as well as ‘consumer rights and responsibilities’ in Japanese textbooks. Results showed that in Korea, responsibility (23.36%) was most emphasized, followed by interaction (22.43%), cooperation (19.63%), fairness (18.69%), finiteness (10.28%), and diversity (5.61%). In Japan, cooperation (21.74%) and interaction (21.45%) received significant attention, followed by fairness (16.23%), responsibility (13.91%), finiteness (13.33%), and diversity (13.33%). Korean textbooks exhibited a wider range of ESD concept percentages compared to Japan. In the Korean textbooks, responsibility was emphasized for promoting rational and ethical consumption, while Japanese textbooks highlighted cooperation in resolving consumer issues and collaborating with local and international communities to address environmental concerns. Interaction was emphasized regarding the impact of individual and family consumption on society, economy, and the environment. Overall, both Korean and Japanese home economics textbooks reflected elements that foster sustainable consumer behaviors.