Graphene paper with controlled pore structure for high-performance cathodes in Li–O₂ batteries

Kim, Do Youb,Kim, Mokwon,Kim, Dong Wook,Suk, Jungdon,Park, Jung Jin,Park, O Ok,Kang, Yongku Elsevier 2016 Carbon Vol.100 No.-

<P>In non-aqueous Li-O-2 batteries, relatively large amounts of discharge products are formed on air cathodes. As such, the expansion of air cathodes is a critical issue that remains to be solved. Here, we report the fabrication of highly porous free-standing graphene paper by introducing macropores within the paper using polystyrene colloidal particles as a sacrificial template. The as-prepared macroporous graphene paper (mp-GP) have a large BrunauereEmmetteTeller (BET) surface area (ca. 373 m(2) g(-1)), a large pore volume (ca. 10.9 cm(3) g(-1)), and a high porosity (91.6%). Owing to the high surface area and large pore volume, the mp-GPs exhibit a high specific capacity of ca. 12,200 mAh g(-1) at a current density of 200 mA g(-1), as well as good rate capability, when used as an air cathode in a non-aqueous Li-O-2 battery. Moreover, the mp-GP shows good stability up to 100 and 78 cycles at a current density of 500 mA g(-1) and 2000 mA g(-1) respectively, with a limiting capacity of 1000 mAh g(-1). It is found that formation and decomposition of the discharge product, Li2O2, occur within the macropores, and thus, the mp-GP maintains its original structure without considerable expansion during cycling. (C) 2016 Elsevier Ltd. All rights reserved.</P>

Thermoset polyester droplet-based microfluidic devices for high frequency generation

Kim, Jin-young,deMello, Andrew J.,Chang, Soo-Ik,Hong, Jongin,O'Hare, Danny Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.23

<P>The vast majority of droplet-based microfluidic devices are made from polydimethylsiloxane (PDMS). Unfortunately PDMS is not suitable for high frequency droplet generation at high operating pressure due to its low shear modulus. In this paper, we report the fabrication and testing of microfluidic devices using thermoset polyester (TPE). The optical characteristics of the fabricated devices were assessed and substrate resistance to pressure also investigated. TPE devices bonded using an O<SUB>2</SUB> plasma treated PET substrate at 76 °C were shown to function efficiently at pressures up to 18 MPa. TPE material retains many of the attractive features of PDMS such as ease of fabrication but significantly, has superior mechanical properties. The improved resistance of TPE to high pressures enabled investigation of high frequency droplet generation as a function of a wide range of flow-rates with three different oils as continuous phase.</P> <P>Graphic Abstract</P><P>Droplet-based microfluidic devices to withstand high pressure have been successfully fabricated using thermoset polyester (TPE) materials for high frequency generation of droplets. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1lc20603f'> </P>

<tex> ${\rm TmBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}}$</tex> Superconducting Thin Films Grown by Pulsed Laser Deposition

Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2

<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>

감마선에 의한 Salmonella choleraesuis, E. Coli K12 and Staphylococcus aureus의 살균에서 O2와 aeration의 효과

이오미 ( O Mi Lee ),김해연 ( Hae Yeon Kim ),김진명 ( Jin Myoung Kim ),김태훈 ( Tae Hun Kim ),이면주 ( Myun Joo Lee ),유승호 ( Seung Ho Yu ) 한국공업화학회 2008 응용화학 Vol.12 No.2

韓國人의 各 臟器組織中 靑酸鹽의 微量分布에 關한 硏究(Ⅱ)

張成吉,金恩浩,金英雲,李鎭勳,柳在薰,權五星,金明德,吳世珍,金由那 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

만성 정신질환자 가족의 우울증상 및 관련 요인 조사

심민영,임선진,김진훈,권오향,조성진,김석주,김계현,이병학,한덕현 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.4

Objectives : It has been reported that caregivers of patients with chronic mental illness including schizophrenia are in higher risk for psychological and physical health problem. This study was performed to evaluate the depressive symptoms and associated factors in caregivers of patients with chronic mental illness. Methods : The subjects were 77 unaffected caregivers (30 parents, 30 siblings, 10 offspring, and 7 spouses) of patients with chronic mental illness (62 schizophrenia, 4 schizoaffective disorder, 11 bipolar disorder) and 100 healthy controls. Depressed mood was assessed by Beck Depression Inventory (BDI) in all subjects. For their sick family members, clinical factors including psychotic symptoms using the Positive and Negative Syndrome Scale (PANSS), duration of illness, number of admission were assessed. Results : The mean BDI score of the caregivers was significantly higher than that of control subjects (11.2±11.6 and 8.0±17.5). Given that 23.4% of family group and 23.0% of control group are attributed to mild to moderate depressed state and 22.0% of family group and 8.0% of control group to above moderate depressed state, significant depressive symptom is more frequently observed in family group. The mean BDI score of parent group was higher than that of sibling group controlling for sex and age. In the parent group, BDI scores are positively correlated with age while the offspring and spouse group had negative correlation between BDI scores and age. Higher age, lower socioeconomic state, more severe positive symptom scores of patients were potential predictors for BDI scores of caregivers. Conclusion : This study showed that caregivers of patients with chronic mental illness have significant depressive symptoms. It may be suggested that depressive symptoms of caregivers are associated with aging, low socioeconomic state, and severe positive symptom rather than chronicity of their sick family members.

Laser와 열전대를 이용한 연기선단의 위치 추적 비교에 관한 연구

김명배,한용식,윤명오,김진곤 韓國火災ㆍ消防學會 1998 한국화재소방학회논문지 Vol.12 No.3

천장아래에 형성된 연기흐름을 대상으로 Laser 평면광과 열전대를 이용하여 연기선단의 위치를 추적하였다. 새로운 실험방법을 이용하여 연기선단의 도착순간을 열전대의 온도신호로부터 판단하는 종래의 직관적 기준을 평가하였다. 이러한 실험방법에서 사용된 Laser 평면광은 연기를 가시화하기 위한 종래의 여러방법에 비교하여 뚜렷한 장점들이 있음을 입증하였다. A new experimental technique using a laser sheet and thermocouples is introduced to evaluate an intuitive criterion for tracking of a smoke front using thermocouples. From synchronized photos of the smoke front along with temperature signals, the intuitive criterion is shown to be acceptable. Smoke visualization by a laser sheet proves to have several advantages over the conventional techniques such as the use of smoke generators.

소음성 청력장애에 관한 조사연구

김준언,이채언,문덕환,김진옥,하회영,윤병용,배기택,김용완,전종휘 인제대학교 1982 仁濟醫學 Vol.3 No.2

부산지역 일부 섬유, 고무 및 제강 산업장의 소음 작업부서 종사 근로자들중 6분법에 의한 청력장애(21dB이상)자는 조사대상의 6.30%이었다. Authors surveyed on the status of prevalence and several characters related with the occurrence of noise induced hearing impairment on 2,963 numbers of workers engaged in noisy department of twelve industries which were Textile, Rubber and Steel-Wire in Busan from July 1st, 1980 to September 30th, 1981. The obtained results were as follows: 1.About 90 percent of workers in noisy department engaged in the place of noise level less than 100dB(A). 2.The prevalence of occupational healing loss of workers engaged in noisy department by each level of hearing loss was respectively 5.43 percent at 21dB and above. 2.53 percent at 31dB and above, 0.80 percent at 41dB and above. 3.Workers of noise induced hearing impairment showed typical Cs-dip in Audiogram. 4.About 80 percent and above of workers of noise induced hearing impairment determined hearing loss of 40dB and below. 5.Hearing loss of workers of noise induced hearing impairment increased with aging. 6.Hearing loss of workers of noise induced hearing impairment was in accordance with the duration of employment in 7 years and below. 7.The occurred rate of noise induced hearing impairment using ELI(Early Loss Index) was about 92 percent(D-E scale).

건강질단 질병 유소견자들의 순천향구미병원 외래이용에 영향을 미치는 요인

김진석,우극현,함정오,유재영,최태성,하봉구,윤성용 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

Background ; The purpose of routine health screening of employee is not only to detect worker's disease at early stage but also to provide early appropriate health service. But, majority of patients who diagnosed by routine health screening haven't underwent health service utilization. Soonchunhyang Kumi Hospital had been provide total occupational health service in kumi industrial estate including health screening, worker interview at workplace by occupational nurses and doctors. Object ; We want to know how much proportion of patient who are diagnosed by routine health screening had visited Soonchunhyang Kumi hospital out-patient clinic and factors influencing such health care service utilization. Method ; Initial study subject were 189 workers who had proved to have hypertension, diabetes mellitus, hyperlipidemia in routine health screening which performed during year of 2000. Among those, 160 workers who had finished questionnaire were selected for final study subject. We investigate whether they had visited health services or not, if they had, what kind of health care facility they visited, and other factors which influencing their health service utilization. Result ; Among 160 workers, 59(36.9%) had visited Soonchunhyang Kumi hospital, 47(29.4%) had visited other health care facility, and 54(33.8%) had not went to any health care facility. Factors which influencing Soonchunhyang Kumi hospital utilization is sex, job, staff's support to hospital visit during worktime, history of medical consultation about health screening result.

전두엽 상내측 신경교종의 수술 수 발생하는 운동보조영역 증후군

김재현,고영초,이채혁,권오기,최우진,박효일 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2

Objective : This retrospective study was aimed to correlate characteristic neurologic deficits of transient contralateral motor weakness with or without speech disturbance(Supplementary Motor Area, SMA syndrome) after the resection of the gliomas in the superior frontal gyrus, especially with the extent of resection of the tumors. Method : Ten patients with medial superior frontal glioma, who underwent gross total or subtotal resection of the tumor, as well as, partial or complete resection of the spolementary motor area were studied. The following parameters were evaluate 1) tumor location 2) extent of resection 3) degree and duration of postoperative deficits. Result : Postoperative neurologic deficits were transient contralateral motor weakness with or without motor dysphasia. As a whole, postsurgical SMA syndrome occurred in 3 patients out of 10 patients with medial superior frontal gliomas(30%), who underwent gross total or subtotal resection of the tumors. Motor deficits were present in 3 out of 10 patients and speech disturbances in 2 out of 3 left frontal gliomas. Recovery of neurological dysfunction was rapid occurring between the 5th 14th POD and their neurological function returned almost normal in two patients. In the remaining one patient, who had preoperative mild motor weakness showed incomplete recovery of the worsened motor weakness and newly developed speech disturbance till 1yr postoperatively. Conclusion : The postsurgical SMA syndrome in patients with glioma in the medial superior frontal gyrus was not so uncommon phenomenon and well correlated with the extent of surgical resection of the supplementary motor area. Thus, preoperative awareness and warning about the possibility of the development of this charicteristic SMA syndrome is necessary.