Energy storage capabilities of nitrogen-enriched pyropolymer nanoparticles fabricated through rapid pyrolysis

Yun, Young Soo,Kim, Yu Hyun,Song, Min Yeong,Kim, Na Rae,Ku, Kyojin,An, Ji Su,Kang, Kisuk,Choi, Hyoung Jin,Jin, Hyoung-Joon Elsevier 2016 Journal of Power Sources Vol.331 No.-

<P><B>Abstract</B></P> <P>Nanostructured pyropolymers contain significant amounts of redox-active heteroatoms, have high specific surface areas, and a defective carbon microstructure, indicating good potential for pseudocapacitive charge storage. In this study, nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) are fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>. N-PNs-50 exhibit a nitrogen content of 9.8 wt%, a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>, and an amorphous carbon structure with an I<SUB> <I>D</I> </SUB>/I<SUB> <I>G</I> </SUB> intensity ratio of 0.95. These unique characteristics lead to good electrochemical performances, in which reversible capacities of 660 and 255 mAh g<SUP>−1</SUP> are achieved for Li-ion and Na-ion storage, respectively, with favorable voltage characteristics (<1.5 V for Li-ions and <1.2 V for Na-ions). This study provides a more feasible production method for nitrogen-doped pyropolymers and their practicable electrochemical performances for use as an anode in energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanostructured pyropolymers (N-PNs-50) were fabricated by rapid pyrolysis. </LI> <LI> N-PNs-50 exhibited a nitrogen content of 9.8 wt% and amorphous carbon structure. </LI> <LI> N-PNs-50 exhibited a high specific surface area of 875.8 m<SUP>2</SUP> g<SUP>−1</SUP>. </LI> <LI> 660 and 255 mAh g<SUP>−1</SUP> were achieved for Li-ion and Na-ion storage, respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Nitrogen-enriched pyropolymer nanoparticles (N-PNs-50) were fabricated from polyaniline nanotubes through rapid pyrolysis at 50 °C min<SUP>−1</SUP>, showing superior electrochemical performances.</P> <P>[DISPLAY OMISSION]</P>

A study of ^99mTc-sestamibi labeling condition using radio-chromatography

Moon, Sung-Hyun,Lee, Yun-Sang,Lee, Dong Soo,Chung, June-Key,Jeong, Jae Min Korean Society of Radiopharmaceuticals and Molecul 2017 Journal of radiopharmaceuticals and molecular prob Vol.3 No.1

Tc-99m labeled sestamibi ($^{99m}Tc$-MIBI) is one of most widely used radiopharmaceuticals for myocardial SPECT imaging. Radiolabeling of $^{99m}Tc$-MIBI is recommended by heating in $100^{\circ}C$ water bath for 15 min. However, the water bath might be a source of contamination. Thus, if radiolabeling of $^{99m}Tc$-sestamibi can be performed at room temperature, then it would be more convenient to use in clinical application. In this study, we performed the radiolabeling of $^{99m}Tc$-MIBI in different temperature conditions or using different instruments to find out the efficient labeling condition. We studied the $^{99m}Tc$-MIBI labeling at room temperature or $100^{\circ}C$ heating block, and checked the labelling yields every 1 min for 10 min using radio-TLC with 2 different eluents-saline and acetone. From the experiment, we confirmed that the $^{99m}Tc$-MIBI can be labeled over 90% yield but not completed at room temperature. However, the $^{99m}Tc$-MIBI labeling was completed when it was performed in the $100^{\circ}C$ heating block. Finally, we proved that heating is essential for complete $^{99m}Tc$-MIBI labelling, furthermore using heating block is also possible instead of water bath.

A Study on the Miniaturization of a Protective Device for the Micro Smart Grid Simulator

Yun‑Seok Ko,Kyung Ryu,Min‑Soo Oh,Hyuk‑Sik Yoon 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1

In this paper, a miniaturization methodology of protective devices (PDs) was proposed which plays a key role in evaluating the efectiveness of the developed protection and control algorithms in the micro smart grid simulator. The micro PD was designed to have the rated voltage of 19 V and the breaking current of 20 A, and was designed in a multi-layered hardware structure to satisfy the size of 13×13 cm2 . Also, the micro PD was designed in a multifunctional structure to allow one micro PD to perform all the functions of the circuit breaker, recloser and switches on the micro smart grid simulator to enhance the efciency of development. Finally, it was verifed that the developed micro PD can be applied as protective devices of the micro smart grid simulator by showing that it operates correctly according to the predetermined operation sequence for the test scenarios on the built test system.

방광 크롬친화세포종과 동반된 배뇨후 벼락두통

하윤석,강성진,허소영,이지현,김민정,김종국,김광수 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1

Thunderclap headache is a hyperacute, severe headache that is so named because the pain strikes suddenly and severely, and is sometimes a sign of a medical emergency. We report a case of pheochromocytoma in the urinary bladder in a 48-year-old woman who presented with recurrent thunderclap headache after voiding and exercise. So we think thunderclap headache during or immediately after micturition may be an important diagnostic clue of bladder pheochromocytoma.

토양 과습 조건하에서 수수의 생육특성

윤민헌,권수정,주영환,최주영,우선희 忠北大學校 農業科學硏究所 2021 農業科學硏究 Vol.37 No.2

본문참고

K대학 치위생과 재학생의 학과만족도 조사 연구

송윤신,권순복,안금선,김영남,김수화,차민주 경복대학 2003 京福論叢 Vol.7 No.-

경기 K대학 치위생과 재학생들의 대학 진학시 학과선택 요인을 알아보고, 학과 만족도를 분석하여 치위생과 학과 경쟁력을 높이고 학생지도의 기초자료를 제공하고자 한다. 치위생과 입학 결정시 영향을 준 요인으로는 전반적으로 본인이 가장 높게 나타났으나 학년별로는 2학년이 77.5%로 가장 높았으며, 치위생과 선택이유로는 취업보장, 주위권유, 적성·흥미 순으로 조사되었다. 치위생과 학과만족도에서 강의실환경에 대해서는 전체 조사대상자 중 9.4%가 만족하다고 응답했고, 실험·실습기자재는 36.0%가 만족한다고 응답하였으며, 학우관계에서는 74.0%, 학과지도방침 38.9%, 치과위생사 직업만족도는 79.4%가 만족하고 있었다. 특히 조사대상자 중 다른 학년보다 2학년 학생들에게서 직업만족도를 제외한 다른 항목의 만족도가 가장 높게 나타나고 있다. 직업만족도는 1학년이 85.4%로 가장 높게 조사되었다. 휴학·자퇴를 고려한 경험유무에 대한 질문에서는 있다고 응답한 학생이 47.8%이었으며, 그 이유로 1학년은 경제적이유를, 2, 3학년은 적성이라고 응답하였다. 입학결정요인과 만족도와의 관계에서는 본인이 입학을 결정했을 때 재학만족도, 직업만족도, 학과지도방침, 전임교수에 만족한다고 응답한 경우가 가장 많았으며 진로계획에서는 취업이 가장 높았다. 학우관계와 만족도와의 관계에서는 학우관계에 만족한다고 응답한 경우 재학만족도, 직업만족도, 학과지도방침에 대한 만족도가 높은 것으로 분석되었다. 구강보건교육이 치위생과 선택에 미친 영향력에 대한 조사에서는 학년별 유의성은 보이지 않았으나, 전체조사대상 중 89.5%가 영향력이 보통이상이라고 응답해 높은 비율을 차지하는 것으로 나타났다. The purpose of this study is to identify the factors affecting selection of a major and the department satisfaction for improving the competitiveness of the dental hygiene department and providing the data for students guidance. The most influential person and factor in selecting a major is the person oneself(77.5% of the second-year students responded to the question) and the percentage of employment. The reaction of satisfaction with the classroom and practice facility indicates 9.4% and 36.0% in favor. 74.0% of surveyees is satisfied with classmates. In satisfaction with a course of department and profession, 38.9% and 79.4% of respondents answer in the affirmative. The second-year students of the respondents shows higher rate than other grades in .satisfaction with items above, except the satisfaction with profession. It appears that the freshman answered the most in that question. From the survey related to the experience of thinking over temporary absence from school or voluntary resignation, 47.8% of surveyees responded they had experienced thinking about that. The freshman answered the reason is financial difficulty and the second- and third-year students selected an aptitude. In the correlation coefficient of determinants for selection of college with the department satisfaction, when the determinant is oneself, the satisfaction with being at college, profession, a course of department, and teaching staff is high. In the correlation coefficient of classmates with department satisfaction, the students responding in the affirmative on classmate satisfaction had a high degree of satisfaction with being at college, profession, and a course of department. The experience of oral health education is not statically significant by grades to select the major, but 89.5% of the students majoring dental hygiene at K-college responded over average.

인대내 거대자궁 근종 증례

김윤진,전명권,이응수,최형민 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.4

Uterine myomas are the most common pelvic tumor in women. These benign tumor generally arise in the uterinie wall and intraligamentary myomas are relatively rare cases. We experienced intraligamentary huge myoma. Preoperative GnRH(Gonadotropin Releasing Hormone) agonist therapy was done but the effect was nearly absent. Hystrectomy was done without complication. We report this case with brief review of literatures.

가족인형놀이가 정신지체 아동의 자발적 발화에 미치는 효과 : 사례연구 Case Study

김윤선,김수정,이경희,한현민 대진대학교 교육대학원 교육연구소 2002 교육연구 Vol.4 No.1

The experiment was undertaken to determine the effect of family puppet play on spontaneous utterance of a five-year-old child with mental retardation. The intervention was three major activites, that is the meeting with father, the playing with elder brother, and the eating time with mother. The intervention continued over 15 weeks, and lasted 26 sessions (20 minutes a session). The data gathered were response to imitation demand, spontaneous imitation, spontaneous utterance, and emotion expressive utterance. The results revealed that in initial sessions response to imitation demand and spontaneous imitation were dominated, but spontaneous utterance and emotion expressive utterance were rapidly increased after 10th and 12th session, respectively.

강관 보강된 전단벽 경계부재의 전단성능에 관한 실험연구

성수용,윤현도,정수영,장민수 忠南大學校 産業技術硏究所 1999 산업기술연구논문집 Vol.14 No.1

The purpose of this study is to investigate the begavior of concrete filled square stee ltubular boundary elements subjected to cyclic shearing force and constant axial force. Six boundary elements, with a/D=1.0,were tested to determine their maximum shear force and compare primary curve, energy absorption capacity and stiffness degradation. As a result, in the both high and normal strength concrete boundary elements, the larger the wall breadth to wall thickness ratio(D/t) of the steel tube,the more prominent the decrease in structural performance due to cyclic loading. In the boundary element with D/t=25, the crushing of tube concrete were accompanied by considerable lateral displacement,while in the boundary element with D/t more than 39, the lacal bucking of steel tube and the crushing concrete were accompanied by considerable axial shortening.

Hop Extract Produces Antinociception by Acting on Opioid System in Mice

Park, Soo-Hyun,Sim, Yun-Beom,Kang, Yu-Jung,Kim, Sung-Su,Kim, Chea-Ha,Kim, Su-Jin,Seo, Jee-Young,Lim, Su-Min,Suh, Hong-Won The Korean Society of Pharmacology 2012 The Korean Journal of Physiology & Pharmacology Vol.16 No.3

In the present study, the antinociceptive profiles of hop extract were characterized in ICR mice. Hop extract administered orally (from 25 to 100 mg/kg) showed an antinociceptive effect in a dose-dependent manner as measured in the acetic acid-induced writhing test. Antinociceptive action of hop extract was maintained at least for 60 min. Moreover, cumulative response time of nociceptive behaviors induced with intraplantar formalin injection was reduced by hop extract treatment during the 2nd phases. Furthermore, the cumulative nociceptive response time for intrathecal injection of substance P ($0.7{\mu}g$) or glutamate ($20{\mu}g$) was diminished by hop extract. Intraperitoneal pretreatment with naloxone (an opioid receptor antagonist) attenuated antinociceptive effect induced by hop extract in the writhing test. However, methysergide (a 5-HT serotonergic receptor antagonist) or yohimbine (an ${\alpha}_2$-adrenergic receptor antagonist) did not affect antinociception induced by hop extract in the writhing test. Our results suggest that hop extract shows an antinociceptive property in various pain models. Furthermore, the antinociceptive effect of hop extract may be mediated by opioidergic receptors, but not serotonergic and ${\alpha}_2$-adrenergic receptors.