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Effect of Al modified Li4Ti5O12 anode/activated carbon cathode for advanced hybrid supercapacitors
Ye-Wan Yoo,임인호,Seung-Hwan Lee 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
In this paper, we successfully fabricated Al-modified Li4Ti5O12 in one-step, easily, simply, and quickly. The structuralproperties of Li4Ti5O12 by Al modification were favorable to electrochemical activity compared to pristine Li4Ti5O12, and thus,it was confirmed that electrochemical performances such as cell balancing and initial discharge capacitance were effectivelyimproved. The optimized anode/cathode thickness was selected 70 μm/240 μm. Al modified Li4Ti5O12 realized high dischargecapacitance of 61 F/g. Therefore, Al modification can be considered as one of the effective methods for the electrochemicalperformances of Li4Ti5O12 anodes for next-generation hybrid supercapacitors.
Jang, Ye-Ri,Kim, Ju-Myung,Lee, Jung-Han,Cho, Sung-Ju,Kim, Guntae,Ju, Young-Wan,Yeon, Sun-Hwa,Yoo, JongTae,Lee, Sang-Young The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.39
<P>Formidable challenges facing lithium-ion rechargeable batteries, which involve performance degradations and safety failures during charge/discharge cycling, mostly arise from electrode-electrolyte interface instability. Here, as a polymeric ionic liquid (PIL)-mediated interfacial control strategy to address this long-standing issue, we demonstrate a new class of molecularly designed, ion/electron-conductive nanoshields based on single-walled carbon nanotube (SWCNT)-embedded, dual-doped mesoporous carbon (referred to as “SMC”) shells for electrode materials. The SMC shell is formed on cathode materials through solution deposition of the SWCNT/PIL mixture and subsequent carbonization. The PIL (denoted as “PVIm[DS]”) synthesized in this study consists of poly(1-vinyl-3-ethylimidazolium) cations and dodecyl sulfate counter anions, whose molecular structures are rationally designed to achieve the following multiple functions: (i) precursor for the conformal/continuous nanothickness carbon shell, (ii) dual (N and S)-doping source, (iii) porogen for the mesoporous structure, and (iv) SWCNT dispersant. Driven by such chemical/structural uniqueness, the SMC shell prevents direct exposure of cathode materials to bulk liquid electrolytes while facilitating redox reaction kinetics. As a consequence, the SMC-coated cathode materials enable significant improvements in cell performance and also thermal stability. We envision that the SMC shell can be suggested as a new concept of effective and versatile surface modification strategy for next-generation high-performance electrode materials.</P>
Kim, Hee Jun,Park, Joonmo,Ye, Byeong Uk,Yoo, Chul Jong,Lee, Jong-Lam,Ryu, Sang-Wan,Lee, Heon,Choi, Kyoung Jin,Baik, Jeong Min American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.28
<P>Parallel aligned mesopore arrays in pyramidal shaped GaN are fabricated by using an electrochemical anodic etching technique, followed by inductively coupled plasma etching assisted by SiO2 nanosphere lithography, and used as a promising photoelectrode for solar water oxidation. The parallel alignment of the pores of several tens of micrometers scale in length is achieved by the low applied voltage and prepattern guided anodization. The dry etching of single-layer SiO2 nanosphere-coated GaN produces a pyramidal shape of the GaN, making the pores open at both sides and shortening the escape path of evolved gas bubbles produced inside pores during the water oxidation. The absorption spectra show that the light absorption in the UV range is similar to 93% and that there is a red shift in the absorption edge by 30 nm, compared with the flat GaN. It also shows a remarkable enhancement in the photocurrent density by 5.3 times, compared with flat GaN. Further enhancement (similar to 40%) by the deposition of Ni was observed due to the generation of an electric field, which increases the charge separation, ratio.</P>
Actual compliance to adjuvant chemotherapy in gastric cancer
Dong-Wook Kim,Oh Kyoung Kwon,Moon-Won Yoo,Seung-Wan Ryu,Sung Jin Oh,Hoon Hur,Sun-Hwi Hwang,Junhyun Lee,Sung-Ho Jin,Sang Eok Lee,Jong-Han Kim,Jin-Jo Kim,In Ho Jeong,Ye Seob Jee 대한외과학회 2019 Annals of Surgical Treatment and Research(ASRT) Vol.96 No.4
Purpose: This study aims to investigate the actual compliance with chemotherapy and analyze several factors affecting the compliance in patients with gastric cancer. Methods: From February 2012 to December 2014, we collected data of patients with gastric cancer who received adjuvant chemotherapy (TS-1 monotherapy or XELOX: capecitabine/oxaliplatin) in Korea. Results: We collected data of 1,089 patients from 31 institutions. The completion rate and dose reduction rate by age (≥60 years vs. <60 years) were 57.5% vs. 76.8% (P < 0.001) and 17.9% vs. 21.3% (P = 0.354); by body mass index (BMI) (≥23 kg/m2 vs. <23 kg/m2) were 70.2% vs. 63.2% (P = 0.019) and 19.2% vs. 19.9% (P = 0.987), respectively. The compliance by American Society of Anesthesiologists physical status (ASA PS) classification was as follows: completion rate was 74.4%, 62.8%, and 60% (P = 0.001) and the dose reduction rate was 18.4%, 20.7%, and 17.8% (P = 0.946) in ASA PS classification I, II, and III, respectively. The completion rate of TS-1 and XELOX was 65.9% vs. 70.3% (P = 0.206) and the dose reduction rate was 15.7% vs. 33.6% (P < 0.001). Furthermore, the completion rate of chemotherapy by surgical oncologists and medical oncologists was 69.5% vs. 63.2% (P = 0.028) and the dose reduction rate was 17.4% vs. 22.3% (P = 0.035), respectively. Conclusion: The compliance was lower in patients who were older than 60 years, had BMI <23 kg/m2, and had higher ASA PS classification. Furthermore, the patients showed higher compliance when they received chemotherapy from surgical oncologists rather than from medical oncologists
Effect of MoO3 surface coating on electrochemical performances of LiNi0.8Co0.1Mn0.1O2 cathode
Park Sung-Bum,Kang Chea-Yun,Hwang Do-Young,Yoo Ye-wan,Park Hye-Jin,Park Jun-Ho,Kim Hyun-Soo,Lee Seung-Hwan 한국물리학회 2022 Current Applied Physics Vol.44 No.-
In this paper, we synthesize the MoO 3 modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode (denoted as M-NCM81) and compare with pristine LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode (denoted as P-NCM81). The M-NCM81 cathode delivers good cation ordering and typical spherical form. The M-NCM81 cathode shows initial discharge capacity of 203.8 mAh g - 1 at 0.1 C, capacity retention of 79.8% under the 5.0 C. In addition, the M-NCM81 cathode still retain a discharge capacity of 172.2 mAh g -1after 100 cycles. Such electrochemical performances are significantly improved compared to those of P-NCM81. It can be elucidated that MoO 3 coating layer acts as a HF inhibitor/scavenger. The MoO 3 modification plays an important role in inhibiting severe structural degradation, derived from a harmful side reaction with electrolyte. It effectively suppresses the increase in charge-transfer resistance, leading to superior electrochemical performances.
워그너_빌 분포 변환 기법을 이용한 마취단계별 심박변이율 신호 분석
전계록,김명철,유주연,이해림,박성민,손정만,예수영,노정훈,김길중,백승완,Jeon, Gye-Rok,Kim, Myung-Chul,Yoo, Ju-Yeon,Lee, Hae-Lim,Park, Seong-Min,Shon, Jung-Man,Ye, Soo-Young,Ro, Jung-Hoon,Kim, Gil-Jung,Baik, Seung-Wan 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.2
In this study, the heart rate variability(HRV) signal of operating patient was acquired according to anesthesia progress and identified to evaluation possibility of depth of anesthesia in each anesthesia stage. The HRV signal was analyzed time-frequency domain applied to Wigner-Ville distribution method, the characteristic parameters were extracted for evaluation of depth of anesthesia in each anesthesia stage. The progress of general anesthesia was divided into the states of pre-operation, induction of anesthesia, operation, awaking and post-operation.
박종현 ( Jong Hyun Park ),박성환 ( Sung Hwan Park ),김백선 ( Paek Sun Kim ),이준욱 ( Joon Wook Lee ),유완희 ( Wan Hee Yoo ),주영실 ( Yeong Shil Joo ),이신석 ( Shin Seok Lee ),김완욱 ( Wan Uk Kim ),민준기 ( Jun Ki Min ),홍연식 ( Ye 대한류마티스학회 1999 대한류마티스학회지 Vol.6 No.3
Dermatomyositis is a clinical entity characterized by a distinctive cutaneous rash and inflammatory myopathy. In this disorder, the pneumomediastinum is quite a rare complication and is assumed to result from air leakage due to vasculitis, lung fibrosis or rarely after bronchoscopic lung biopsy and pulmonary function test. We describe patient with dermatomyositis who developed pneumomediastinum, pneumothorax and massive subcutaneous emphysema after pulmonary function test. She died due to respiratory failure. We think that careful observation is required in performing PFT in dermatomyositis patients with presumed interstitial lung diseases.