Hierarchically nanoporous pyropolymer nanofibers for surface-induced sodium-ion storage

Yoon, Hyeon Ji,Lee, Min Eui,Kim, Na Rae,Yang, Seung Jae,Jin, Hyoung-Joon,Yun, Young Soo Pergamon Press 2017 Electrochimica Acta Vol. No.

<P><B>Abstract</B></P> <P>Surface-driven charge storage materials based on both electrochemical double layer (EDL) formation and pseudocapacitive behavior can deliver high energy and power capabilities with long-lasting cycling performance. On the other hand, the electrochemical performance is strongly dependent on the material properties, requiring sophisticated electrode design with a high active surface area and a large number of redox-active sites. In this study, hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) were fabricated from electrospun polyacrylonitrile nanofibers by simple heating with KOH. The HN-PNFs have a hierarchically nanoporous structure and an exceptionally high specific surface area of 3,950.7m<SUP>2</SUP> g<SUP>−1</SUP> as well as numerous redox-active heteroatoms (C/O and C/N ratio of 10.6 and 16.8, respectively). These unique material properties of HN-PNFs resulted in high reversible Na-ion capacity of ∼292mAhg<SUP>−1</SUP> as well as rapid kinetics and stable cycling performance in the cathodic potential range (1-4.5V vs. Na<SUP>+</SUP>/Na). Furthermore, energy storage devices based on HN-PNFs showed a remarkably high specific energy of ∼258 Wh kg<SUP>−1</SUP> at ∼245Wkg<SUP>−1</SUP> as well as a high specific power of ∼21,500Wkg<SUP>−1</SUP> at ∼78 Wh kg<SUP>−1</SUP>, with long and stable cycling behaviors over 2,000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) were fabricated. </LI> <LI> HN-PNFs have a high specific surface area of ∼3,950m<SUP>2</SUP> g<SUP>−1</SUP> and numerous heteroatoms. </LI> <LI> HN-PNFs exhibit high capacities of ∼292mAhg<SUP>−1</SUP> and great rate/cycling performances. </LI> <LI> High energy (258Whkg<SUP>−1</SUP>) and high power (21,500Wkg<SUP>−1</SUP>) are achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Hierarchically nanoporous pyropolymer nanofibers (HN-PNFs) fabricated from electrospun polyacrylonitrile nanofibers by simple heating with KOH exhibited high electrochemical performance for Na-ion storage.</P> <P>[DISPLAY OMISSION]</P>

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>

난치성 간질로 절제한 대뇌피질의 병리소견에 대한 소아군과 성인군의 비교:164예의 분석

김나래,서연림 대한병리학회 1999 Journal of Pathology and Translational Medicine Vol.33 No.12

정렴 설화를 통해 본 예언자적 지식인의 앎과 초극 의지 : 설화의 전승과 도덕적 문제의식의 확장에 관하여

홍나래 이화어문학회 2022 이화어문논집 Vol.56 No.-

북창 정렴은 배우지 않아도 알고 천리안을 지녔으며 신선이 된 인물이라며 당대부터 주목을 받았다. 사대부층에서는 고통스러운 가족 관계 속에서도 신인의 풍모를 더해간 정렴에 꾸준히 관심을 가졌으며, 전승되는 이야기를 통해 정렴은 향유층의 기대와 애정 속에서 점차 예언자적 지식인으로 표상화 되었다. 정렴에 관해서는 초기부터 그의 생이지지, 천리안, 수련과 의약술, 예지, 음악과 관련된 일화들이 소개되었는데, 이후 일화에 서사성이 더해지고 그의 능력과 존재에 대한 경이로움이 부각되었다. 그런데 정렴의 앎을 경탄하는 시각에는 속세를 등질 수밖에 없었던 그의 우울한 삶을 담고 있어서, 설화 속 그의 특별한 앎이 공동체에 도덕적 메시지를 담은 예언이 되지 못한 채 개인적인 존재 확인에 머물고 있다. 그러나 이후 향유층은 정렴의 생애와 가족사에 기존 설화에서 주요하게 등장하는 연명ㆍ복수 화소를 결합시켜 정렴을 앎의 문제로 고민하고 고통스러운 삶을 견디어 내면서도 타인을 위해 순수하게 베풀고 도덕적으로 행동하는 예언자적 지식인으로 구축해갔다. 정렴 설화에서 세상은 복선화음의 질서로 조화롭게 돌아가지 않지만, 그럼에도 불구하고 그는 타자의 고통에 귀 기울여 자신의 수명을 덜어주는 순수한 증여를 실현시키거나, 적대를 품고 나를 찾아온 존재에게도 인간의 도리를 하며 견디어 내면서 불가능한 환대를 시도하고 있다. 이러한 인물상은 우리 문화 속에서 고통스러운 삶을 감내하면서도 희생과 헌신으로 마침내 신이 된 존재들을 닮아 있기에, 정렴 표상은 이러한 신성을 통해 향유층에게 감동을 경험하게 하며, 공동체에 선물처럼 주어진 존재를 우리의 욕망으로 소중하게 여기지 못했다는 반성까지 이끌어낸다. Jeong-Ryeom (1506-1549) received attention during his time as a person who knew without learning, had clairvoyance, and became a god (神仙). Anecdotes related to his excellent knowledge were introduced from the beginning, and the wonder of his knowledge was highlighted as narrative was added to the story later. However, while admiring his knowledge, the legend contains his gloomy life, that had to leave the world, so his special knowledge in the tale has not become a prophecy containing a moral message to the community, but remains the confirmation of his personal existence. Since then, however, people have combined the life-sustaining and revenge motifs that appear mainly in existing tales with Jeong-Ryeom's life and family history; building him up as a prophetic intellectual who can do things purely for others and act morally while suffering from the problem of knowing and enduring a painful life. Significantly, in his tale the world does not return to an order in which good people are blessed. Nevertheless, he listens to the pain of others, reduces his life span for them, and attempts impossible hospitality while enduring those who come to him with hostility. These figures resemble those who endured a painful life in our culture, but eventually became goddesses through sacrifice and devotion. In this way, Jeong-Ryeom's representation touches us through this divinity and leads to reflection that we did not value the existence given to the community as a gift.

파국과 고통에 대한 이해의 문제 : 조반, 안윤 이야기 속 ‘여인의 죽음’ 화소를 중심으로

홍나래 이화어문학회 2021 이화어문논집 Vol.54 No.-

본고는 15세기 서거정, 성현, 이륙과 같은 관인 문학자들이 유교적 도덕 국가 건립에 책임감을 갖고 낙관적으로 삶을 전망하고 있을 당시의 이야기판에서, 조반 첩 자살 사건과 안윤 첩 자살 사건이 어떠한 방식으로 이야기되고 기록되었는지 전설과 소문이라는 관점에서 살펴보고자 했다. 조반이야기는 선비가 여인의 상실이란 슬픔을 딛고 더욱 가치 있는 삶을 시작하게 되었다는 회복과 도약의 서사로 재구성되면서 재난에서 발생하는 소수자들의 희생, 기득권의 책임 소재, 생존자들의 도덕적 상처를 어떻게 애도하고 기억하며 공동체를 회복할 것인지에 대한 모범적인 사례가 되었다. 이와 같은 서사의 힘으로 조선후기 조반은 재조명받게 되었고 마을신으로 좌정된 것으로 보인다. 이에 반해 안윤 사건은 사회제도의 은폐된 폭력성을 드러내고 있다. 저자들은 여인을 열녀로 상찬함으로써 피해자를 위로하거나 사대부 남성이 성적 주체로서의 인식과 규율을 내면화하지 못했다고 은근히 비판하였다. 그러나 어떤 경우라도 조선시대 가부장 신분사회를 긍정하는 사대부의 입장에서는 이들 죽음에 대한 사회적・정치적 애도가 불가능하였기에, 귀신으로 상징되는 사회적 부조리에 대한 주체의 우울과 도덕적 불안의 문제는 결국 후대까지 지속적으로 확장된다. 조반과 안윤 첩들의 자살은 전쟁이나 신분제와 같이 국가 내외적 폭력상황에서 비극적으로 발생한 사건이었던 만큼, 여인들이 죽음에 이르기까지 폭력적 배제, 강요된 희생, 비인간적 신분제, 소통의 부재 등 만만치 않은 개인적・사회적 문제를 담게 되면서, 기득권의 입장에서는 이에 대해 책임 있게 설명하고 여인들의 고통스러운 얼굴에 내재된 모호한 불안을 해소해야 했다. 당대 저자들의 글쓰기는 낯설고 충격적인 사회적 죽음에 대한 공동체의 책임과 치유 및 기억을 위한 애도 작업이라고 할 수 있다. This paper examines how bureaucrats and scholars dealt with the suicide cases of Jo Ban's concubine and Ahn Yun's concubine in the 15th century Joseon society. The story of Jo Ban was reconstructed as a narrative of recovery and leap, whereby the scholar overcame the sorrow of the loss of his concubine and started a more valuable life. After the war in the late Joseon dynasty, Jo Ban’s story received more attention, and the power of this narrative meant he became a village god. On the other hand, the Ahn Yun case revealed the hidden violence of the social system. Therefore, writers sought to comfort the victim by praising her as a virtuous woman, or accused the man of being an immature character as a sexual subject. In any case, it was impossible to mourn socially and politically from the point of view of the nobles who affirmed the patriarchal status of the Joseon dynasty. The suicides of Jo Ban and Ahn Yun's concubines were tragic events that occurred in situations of violence within and outside the country, such as war or the class system. Until the women committed suicide, there were personal and social problems such as violent exclusion, forced sacrifice, inhuman status system, and lack of communication, etc. Therefore, intellectuals had to responsibility account for their suicides and resolve the vague anxiety they caused. The writings of contemporary writers are works of mourning for the community's responsibility for the unfamiliar and shocking social death, and for healing and memory.

팽대부주위 암종에서 Cytokeratin 7과 20의 발현

최종순,감나래,안긍환,박철근 대한병리학회 2000 Journal of Pathology and Translational Medicine Vol.34 No.1

노년기 재혼에 관한 질적 연구 : 재혼한 노인을 대상으로

박충선,배나래 대구대학교 사회복지연구소 2003 社會福祉硏究 Vol.24 No.-

급속한 경제성장으로 인한 의학 기술의 발전과 식생활 개선은 노인들의 평균수명의 연장 시켰다. 또한 노년기 연장은 홀로 살아가는 노인의 수를 증가 시켰다. 이러한 홀로된 노인들은 배우자 상실로 인한 정신적 고독과 심리적 외로움을 많이 겪고있으며, 전근대적인 사고를 가진 노인들과 진취적이고 개방적인 사고를 가진 성인자녀와의 가치관 차이에서 파생되는 문제로 인해 많은 내적·외적갈등과 어려움을 겪고 있다. 이와 같은 고독과 외로움, 성인자녀와의 갈등은 부부가 같이 거주하는 노인보다 홀로된 노인에게 더 많은 문제로 나타나기 시작했다. 이러한 홀로 사는 노인들의 내적 외적문제를 해결하는 하나의 방안으로 노년기재혼을 제시하고자 한다. 홀로된 노인들의 남은 여생에서 행복한 노년기를 영위하기위해서는 가족들의 관심과 사회의 적절한 개입·지원을 필요로 하게 되지만 우리나라는 아직 노인의 재혼에 대한 필요성은 강조되는 반면 실질적인 방안마련은 미흡한 하다고 할 수 있다. 본 연구는 재혼한 노인들의 대상으로 그들의 특성과 재혼의 동기, 재혼의 성립과정, 재혼 후 가족관계, 재혼에 관한 견해를 인터뷰를 통해 분석하여 재혼한 노인들의 사실적인 경험을 바탕으로 한 전반적인 노년기 재혼의 실태를 파악하는데 그 목적 이 있다 The purpose of this study is to increase the understanding of a married couple's relationship and remarriage in old age and to help old people who want to be advised about their remarriage as a coping response of life for widowhood in old age. The subjects were 10 men and 10 women who remarried over 55 years old after bereavement and divorce residing in Daegu and Gyeongbuk areas, and data were collected through depth interviews. The bereaved old people and divorced old people chose remarriage as a coping response of their loneliness. They understand and concede each other, and they maintain mental relations with their own children and keep minimum contact with children of a new spouse. It means they make efforts minimize troubles and stain. And these old people are contented with their life reducing or removing loneliness before remarriage. So, the remarriage in old age can be regarded as a coping type for the old who became alone. And most of emotional problems are resolved by the remarriage of the old. Therefore we need to help the widowed elderly to overcome loneliness and to live a good life for the rest of their life by grasping or understanding their desires

전격성 제1형 당뇨병 1예

노동현,김도형,김나래,박종선,이창헌,김미경,최영식 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

전격성 제1형 당뇨병은 특발성 당뇨병환자에서 임상 경과가 짧고 진단 당시 심각한 대사 합병증을 동반하면서 췌장 효소 수치가 높고 췌도 특이 자가항체가 음성인 새로운 아형으로 알려져 있으며, 일본과 일본 외에서의 유병률에는 차이가 있는 것으로 보인다. 아직 전격성 제1형 당뇨병의 발생 기전은 명확하지 않으며 유전적 감수성이 있는 개체에서 바이러스 감염 등의 환경적인 인자와의 연관성이 가능한 병태생리로 제시되고 있으며 이에 대한 추가적인 연구가 요구된다. 저자들은 케톤산증으로 내원하여 전격성 제1형 당뇨병을 진단받은 증례를 경험하였기에 문헌고찰과 함께 보고 하는 바이다. Some patients with idiopathic type 1 diabetes have a fulminant disorder characterized by the absence of insulitis and of diabetes-related antibodies, a remarkably abrupt onset and high serum pancreatic enzyme concentrations. This is referred to as fulminant type 1 diabetes. A 29-year-old man suffering from abdominal pain, nausea and vomiting consulted to our hospital. Laboratory findings revealed high blood glucose level and the evidence of diabetic ketoacidosis, but the serum HbA1c was normal nevertheless. The low level of plasma C-peptide indicated the loss of endogenous insulin secretion. The patient satisfied the criteria for the diagnosis of fulminant type 1 diabetes. After the patient has been treated with insulin, his symptoms were improved and abnormal laboratory data were normalized. We report this case with a review of the literature

A neonate with Joubert syndrome presenting with symptoms of Horner syndrome

Na Rae Lee,남상욱,김영미,이윤진 대한소아청소년과학회 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.no.sup1

Joubert syndrome (JS) is characterized by the “molar tooth sign” (MTS) with cerebellar vermis agenesis, episodic hyperpnea, abnormal eye movements, and hypotonia. Ocular and oculomotor abnormalities have been observed; however, Horner syndrome (HS) has not been documented in children with JS. We present the case of a 2-month-old boy having ocular abnormalities with bilateral nystagmus, left-dominant bilateral ptosis, and unilateral miosis and enophthalmos of the left eye, which were compatible with HS. Brain magnetic resonance imaging (MRI) revealed the presence of the MTS. Neck MRI showed no definite lesion or mass around the cervical sympathetic chain. His global development was delayed. He underwent ophthalmologic surgery, and showed some improvement in his ptosis. To the best of our knowledge, the association of HS with JS has not yet been described. We suggest that early neuroimaging should be considered for neonates or young infants with diverse eye abnormalities to evaluate the underlying etiology.

Sulfasalazine attenuates tamoxifen-induced toxicity in human retinal pigment epithelial cells

Na Rae Hwang,Su Wol Chung 생화학분자생물학회 2020 BMB Reports Vol.53 No.5

Tamoxifen, a nonsteroidal estrogen receptor (ER) antagonist, is used routinely as a chemotherapeutic agent for ER-positive breast cancer. However, it is also causes side effects, including retinotoxicity. The retinal pigment epithelium (RPE) has been recognized as the primary target of tamoxifen-induced retinotoxicity. The RPE plays an essential physiological role in the normal functioning of the retina. Nonetheless, potential therapeutic agents to prevent tamoxifen-induced retinotoxicity in breast cancer patients have not been investigated. Here, we evaluated the action mechanisms of sulfasalazine against tamoxifen- induced RPE cell death. Tamoxifen induced reactive oxygen species (ROS)-mediated autophagic cell death and caspase-1- mediated pyroptosis in RPE cells. However, sulfasalazine reduced tamoxifen-induced total ROS and ROS-mediated autophagic RPE cell death. Also, mRNA levels of tamoxifen-induced pyroptosis-related genes, IL-1, NLRP3, and procaspase-1, also decreased in the presence of sulfasalazine in RPE cells. Additionally, the mRNA levels of tamoxifen-induced AMD-related genes, such as complement factor I (CFI), complement factor H (CFH), apolipoprotein E (APOE), apolipoprotein J (APOJ), toll-like receptor 2 (TLR2) and toll-like receptor 4 (TLR4), were downregulated in RPE cells. Together, these data provide novel insight into the therapeutic effects of sulfasalazine against tamoxifen-induced RPE cell death.