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Electroencephalogram Power Spectra in Thioacetamide-induced Hepatic Encephalopathy
김지희(Chi Hui Kim), 최원진(Won Jin Choi), 박정숙(Jung Sook Park), 이향이(Hyang Yi Lee), 하정희(Jeoung Hee Ha), 이만기(Maan Gee Lee) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1996, 제 32권 제 3호 1 293-300 (8 pages)
encephalopathy after thioacetamide (TAA) injection to rat, EEG was recorded at two different states: without or with tactile stimulation of tail at regular intervals. Calculations based on the spectral and band analysis were used. The changes in the power spectra and bands were examined in 3 different behavioral stages: normal, mild ataxia and severe ataxia. In normal rats, the stimulation produced the increase in the power of the theta (3.5 ~ 8 Hz) and the gamma (30 ~ 50 Hz) bands. These change... -
Power spectra of solar network and non-network magnetic fields
Lee. J.W., Chae. J.C., Yun. H.S. 한국천문학회 천문학회보 1 Pages
한국천문학회 천문학회보 1995, Vol.20 No.2 26-26 (1 pages)
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Methanol Extract of Longanae Arillus Regulates Sleep Architecture and EEG Power Spectra in Restraint-Stressed Rats
Ma. Yuan, Eun. Jae-Soon, Lee. Kwang-Seung, Lee. Eun-Sil, Kim. Chung-Soo, Hwang. Bang-Yeon, Oh. Ki-Wan 한국생약학회 Natural product sciences 9 Pages
한국생약학회 Natural product sciences 2009, Vol.15 No.4 213-221 (9 pages)
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Ginseng Extract Regulates the Alterations of Sleep Architecture and EEG Power Spectra in Restraint Stressed Rats
Ma. Yuan, Eun. Jae-Soon, Yang. Shulong, Lee. Kwang-Seung, Lee. Eun-Sil, Kim. Chung-Soo, Oh. Ki-Wan 고려인삼학회 Journal of ginseng research 11 Pages
고려인삼학회 Journal of ginseng research 2010, Vol.34 No.1 30-40 (11 pages)
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Alterations of Spontaneous Sleep Architecture and Cortical Electroencephalogram Power Spectra by Red Ginseng Extract via GABAAergic Systems
Yang. Shu-Long, Nam. Sang-Yoon, Han. Jin-Yi, Kim. Jun-Cheol, Lee. Ki-Nam, Hong. Jin-Tae, Oh. Ki-Wan, Eun. Jae-Soon 고려인삼학회 Journal of ginseng research 10 Pages
고려인삼학회 Journal of ginseng research 2010, Vol.34 No.4 304-313 (10 pages)
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Enhanced electrocapacitive performance and high power density of polypyrrole/graphene oxide nanocomposites prepared at reduced temperature
Harish Mudila, Varsha Joshi, Sweta Rana, Mohmd. Ghulam Haider Zaidi, Sarfaraz Alam 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 3 171-179 (9 pages)
polymerization of pyrrole in presence of GO (wt%) ranging from 1.0 to 4.0 with ferric chloride as an oxidant. The formation of the PNCs was ascertained through Fourier-transform infrared spectrometry, X-ray diffraction spectra, scanning electron microscopy and simultaneous thermogravimetric-differential scanning calorimetry. The electrocapacitive performance of the electrodes derived from sulphonated polysulphone-bound PNCs was evaluated through cyclic voltammetry with reference to Ag/ AgCl at a... -
A study of the optimum draft of multiple resonance power buoys for maximizing electric power production
Kweon. Hyuck-Min, Cho. Hong-Yeon, Cho. II-Hyoung 대한조선학회 International journal of naval architecture and ocean engineering 13 Pages
대한조선학회 International journal of naval architecture and ocean engineering 2014, Vol.6 No.4 813-825 (13 pages)
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Sporozoite proteome analysis of Cryptosporidium parvum by one-dimensional SDS-PAGE and liquid chromatography tandem mass spectrometry
AMAM Zonaed Siddiki* 대한수의학회 Journal of Veterinary Science 8 Pages
대한수의학회 Journal of Veterinary Science 2013, 제 14권 제 2호 1 107-114 (8 pages)
Despite the development of new technologies, new challenges still remain for large scale proteomic profiling when dealing with complex biological mixtures. Fractionation prior to liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis is usually the preferred method to reduce the complexity of any biological sample. In this study, a gel LC-MS/MS approach was used to explore the stage specific proteome of Cryptosporidium (C.) parvum. To accomplish this, the sporozoite protein of C.... -
Charting the proteome of Cryptosporidium parvum sporozoites using sequence similarity-based BLAST searching
A.M.A.M.Z. Siddiki*, Jonathan M. Wastling 대한수의학회 Journal of Veterinary Science 8 Pages
대한수의학회 Journal of Veterinary Science 2009, 제 10권 제 3호 5 203-210 (8 pages)
Cryptosporidium (C.) spp. are important zoonotic parasites causing widespread diarrhoeal disease in man and animals. The recent release of the complete genome sequences for C. parvum and C. hominis has facilitated the comprehensive global proteome analysis of these opportunistic pathogens. The well-known approach for mass spectrometry (MS) based data analysis using the BLAST tool (MS BLAST) is a database search protocol for identifying unknown proteins by sequence similarity to homologous... -
Phytotherapeutic effects of Echinacea purpurea in gamma-irradiated mice
Amira M. K. Abouelella, Yasser E. Shahein*, Sameh S. Tawfik, Ahmed M. Zahran 대한수의학회 Journal of Veterinary Science 12 Pages
대한수의학회 Journal of Veterinary Science 2007, 제 8권 제 4호 5 341-352 (12 pages)
Echinacea (E.) purpurea herb is commonly known as the purple coneflower, red sunflower and rudbeckia. In this paper, we report the curative efficacy of an Echinacea extract in ■-irradiated mice. E. purpurea was given to male mice that were divided into five groups (control, treated, irradiated, treated before irradiation & treated after irradiation) at a dose of 30 mg/kg body weight for 2 weeks before and after irradiation with 3 Gy of ■-rays. The results reflected the detrimental... -
Teaching about music and musical instruments of Kenya
David O. Akombo 한국음악교육학회 음악교육연구 25 Pages
한국음악교육학회 음악교육연구 2021, 제 50권 제 2호 11 221-245 (25 pages)
This paper examines the classification of traditional musical instruments of Kenya in the context of teaching multicultural music in the classroom. The paper show cases samples of music and musical instruments of Kenya and how these concepts can be used in a music lesson. The paper s addresses how these musical instruments are taxonomised using established ethnomusicological systems and innovative cultural perspectives to make the subject more discernable for music learners. This paper was... -
Time-dependent proteomic and genomic alterations in Toll-like receptor-4-activated human chondrocytes: increased expression of lamin A/C and annexins
SeungHeeHa, HyoungKyuKim, NguyenThiTuyetAnh, NariKim, KyungSooKo, ByoungDooRhee, JinHan 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 16 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2017, Vol.21 No.5 8 531-546 (16 pages)
Activation of Toll-like receptor-4 (TLR-4) in articular chondrocytes increases the catabolic compartment and leads to matrix degradation during the development of osteoarthritis. In this study, we determined the proteomic and genomic alterations in human chondrocytes during lipopolysaccharide (LPS)-induced inflammation to elucidate the underlying mechanisms and consequences of TLR-4 activation. Human chondrocytes were cultured with LPS for 12, 24,and 36 h to induce TLR-4 activation. The... -
Potentiation of decursinol angelate on pentobarbital-induced sleeping behaviors via the activation of GABAA-ergic systems in rodents
JaeHoonWoo, Tae-WooHa, Jae-SeonKang, JinTaeHong, Ki-WanOh 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2017, Vol.21 No.1 4 27-36 (10 pages)
Angelicae Gigantis Radix (AGR, Angelica gigas ) has been used for a long time as a traditional folk medicine in Korea and oriental countries. Decursinol angelate (DCA) is structurally isomeric decursin, one of the major components of AGR. This study was performed to confirm whether DCA augments pentobarbital-induced sleeping behaviors via the activation of GABAA-ergic systems in animals. Oral administration of DCA (10, 25 and 50 mg/kg) markedly suppressed spontaneous locomotor activity. DCA also... -
Effects of Single Treatment of Anti-Dementia Drugs on Sleep-Wake Patterns in Rats
Ji-YoungJung, MootaekRoh, Kyung-KyunKo, Hwan-SooJang, , Seong-RyongLee, Jeoung-HeeHa, Il-SungJang, , Ho-WonLee, Maan-GeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2012, Vol.16 No.4 2 231-236 (6 pages)
We studied the effects of acetylcholinesterase inhibitors, donepezil and galantamine, and an N-methyl-D-aspartate (NMDA) receptor blocker, memantine, on sleep-wake architecture in rats. Screw electrodes were chronically implanted into the frontal and parietal cortex for the electroencephalography (EEG). EEG was recorded with a bio-potential amplifier for 8 h from 09:30 to 17:30. Vibration was recorded to monitor animal activity with a vibration measuring device. Sleep-wake states such as wake... -
Effects of Isoflurane Anesthesia on Post-Anesthetic Sleep-Wake Architectures in Rats
Hwan-SooJang, Ji-YoungJung, Kwang-HoJang, Maan-GeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2010, Vol.14 No.5 7 291-297 (7 pages)
The sleep homeostatic response significantly affects the state of anesthesia. In addition, sleep recovery may occur during anesthesia, either via a natural sleep-like process to occur or via a direct restorative effect. Little is known about the effects of isoflurane anesthesia on sleep homeostasis. We investigated whether 1) isoflurane anesthesia could provide a sleep-like process, and 2) the depth of anesthesia could differently affect the post-anesthesia sleep response. Nine rats were treated... -
The Effects of Tramadol on Electroencephalographic Spectral Parameters and Analgesia in Rats
Hwan-SooJang, Il-SungJang, Maan-GeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2010, Vol.14 No.3 12 191-198 (8 pages)
seizure was measured using numerical seizure score (NSS). Additionally, band powers, median power frequency and spectral edge frequency 95 were measured to quantify the EEG response. All doses of tramadol produced spike-wave discharge. Tramadol significantly and dose-dependently increased the analgesia, but these effects did not correspond with the changes in the EEG spectral parameters. NSS significantly increased in the Tramadol 20 and 40 mg/kg treatment groups compared to the Control and TRA5... -
Role of Dopamine Receptors on Electroencephalographic Changes Produced by Repetitive Apomorphine Treatments in Rats
HwanSooJang, JiYoungKim, SangHeonKim, Maan-GeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.3 2 147-151 (5 pages)
apomorphine treatment decreased the power of some frequency bands, which were reversed by haloperidol but not by SCH-23390. Repeated apomorphine treatment did not produce significant changes in the power profile. These results show that adaptation of dopamine pathways by repeated apomorphine treatment could be identified with EEG changes such as increases in theta and alpha power of the frontal cortex, and this adaptation may occur through changes in the D1 receptor and/or the D2 receptor. -
Attenuated Sympathetic Activity and Its Relation to Obesity in MSG Injected and Sympathectomized Rats
So-YoungPark, , Yong-WoonKim, Jin-MyoungDan, Jong-YeonKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2007, Vol.11 No.4 4 155-161 (7 pages)
In order to characterize the role of sympathetic activity in obesity, we repeatedly assessed sympathetic activity via power spectral analyses of heart rate variability in the same subjects at 7, 11, 25, and 60 weeks, using monosodium glutamate (MSG)-induced obese and control rats. The effects of lower sympathetic activity on obesity were also evaluated. Fat mass in MSG rats was already higher at 7 weeks, but the sympathetic activity did not differ between 7 and 25 weeks. Between 25 and 60 weeks,... -
Differential Effects of Typical and Atypical Antipsychotics on MK- 801-induced EEG Changes in Rats
JeeSookKwon, KiMinKim, SuMinChang, Choong-YoungKim, TaiHoChung, Byung-JuChoi, MaanGeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.1 3 17-22 (6 pages)
We examined whether the abnormal EEG state by NMDA receptor blocker MK-801 can be reversed by typical and atypical antipsychotics differentially by comparing their spectral profiles after drug treatment in rats. The spectral profiles produced by typical antipsychotics chlorpromazine (5 mg/kg, i.p.) and haloperidol (0.5 mg/kg, i.p.) were differ from that by atypical antipsychotic clozapine (5 mg/kg, i.p.) in the rats treated with or without MK-801 treatment (0.2 mg/kg, i.p.) which produce... -
Spectral Analysis of Heart Rate Variability during Passive Standing after Ethanol Ingestion
HyeongJinKim, ChunDukHan, EunKyoungYang, WonJungLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.6 9 605-613 (9 pages)
The purpose of the present study was to evaluate cardiovascular regulation during passive standing (PS) after ethanol ingestion by spectral analysis of heart rate variability (HRV) in flushed and nonflushed subjects. Of 24 young male subjects, 8 belonged to flushed group (F) and 16 to nonflushed group (NF). Two sessions of 10-min PS were performed before and after ethanol (0.5 g/kg) ingestion. Powers of R-R interval variability in very low frequency (VLF, 0∼0.05 Hz), low frequency (LF,... -
Electroencephalographic Correlation Dimension Changes with Depth of Halothane
MaanGeeLee, EunJuPark, JungMeeChoi, MoonHanYoon 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.5 5 491-499 (9 pages)
the last 5-mins of EEG recording at each concentration level. Correlation coefficients between the parameters and the movements were calculated. Standardized values of three parameters, betaL power, median power frequency (MPF), and D2 were derived by calculation based on the number of animals showing the movement in response to a tail clamp. The betaL power had the largest correlation coefficient to spontaneous movement and to the response to a tail clamp than any other band parameter. MPF had... -
Electroencephalographic Effects of Chlorpromazine in Rats
JeongEYunMaanGeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.3 2 245-250 (6 pages)
(30∼50 Hz). In rats, the low dose of chlropromazine (1 mg/kg, i.p.) produced a significant increase in the power of the beta1 band. The higher doses (5, 10 mg/kg, i.p.) produced a significant increase in the power of the delta, theta, alpha and beta1 bands, and the decrease in the power of the gamma band. The powers of the bands changed dose-dependently. Then, the authors discussed whether the EEG effects produced by a drug are associated with the accompanying behavioral changes specifically. -
Spectral Analysis of Heart Rate Variability during Treadmill Exercise at Various Speeds and Grades
Kim, Hyeong-Jin, Kim, Ki-Hong, Ahn, Dong-Kuk, Park, Jae-Sik 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1996, 제 30권 제 1호 5 43-52 (10 pages)
4, 8, 12, 16 and 20%). A fixed speed was selected for each session with the grade increased every 3 min. The electrocardiogram, respiration and the stepping activity were continuously recorded through an A/D converter system on the computer disk. Power spectra of heart rate variability (RRV) were obtained by use of a fast Fourier transform algorithm. The frequency domain was divided into 3 bands: VLF (0 ~ 0.04 Hz), LF (0.04 ~ 0.15 Hz) and HF (0.15 ~ 1.00 Hz). Heart rate was 74.4±2.1 beats/min... -
Detection of Clavibacter michiganensis subsp. michiganensis Assisted by Micro- Raman Spectroscopy under Laboratory Conditions
Moisé, s Roberto Vallejo Pé, rez, Hugo Ricardo Navarro Contreras, Jesú, s A. Sosa Herrera, José, Pablo Lara Á, vila 한국식물병리학회 The Plant Pathology Journal 12 Pages
한국식물병리학회 The Plant Pathology Journal 2018, 34권 5호 4 381-392 (12 pages)
Clavibacter michiganensis subsp. michiganesis (Cmm) is a quarantine-worthy pest in México. The implementation and validation of new technologies is necessary to reduce the time for bacterial detection in laboratory conditions and Raman spectroscopy is an ambitious technology that has all of the features needed to characterize and identify bacteria. Under controlled conditions a contagion process was induced with Cmm, the disease epidemiology was monitored. Micro-Raman spectroscopy (532 nm... -
Feasibility Study for Detection of Turnip yellow mosaic virus (TYMV) Infection of Chinese Cabbage Plants Using Raman Spectroscopy
한국식물병리학회 The Plant Pathology Journal 5 Pages
한국식물병리학회 The Plant Pathology Journal 2013, 29권 1호 13 105-109 (5 pages)
of Raman measurement, surface enhanced Raman scattering (SERS) was employed. Spectra of extracts from healthy and Turnip yellow mosaic virus (TYMV) infected Chinese cabbage leaves were collected by mixing with gold (Au) nanoparticles. Our result showed that TYMV infected plants could be discriminated from non-infected healthy plants, suggesting the current method described here would be an alternative potential tool to screen virus-infection of plants in fields although it needs more studies to... -
Antimicrobial and Antioxidant Properties of Secondary Metabolites from White Rose Flower
한국식물병리학회 The Plant Pathology Journal 6 Pages
한국식물병리학회 The Plant Pathology Journal 2010, 26권 1호 8 57-62 (6 pages)
Low-molecular-weight secondary metabolites from plants play an important role in reproductive processes and in the defense against environmental stresses or pathogens. In the present study, we isolated various volatiles and phenolic compounds from white Rosa rugosa flowers, and evaluated the pharmaceutical activities of these natural products in addition to their ability to increase survival in response to environmental stress and pathogen invasion. The DPPH and hydroxyl radical-mediated... -
Semantic Key Pre-Distribution Protocol For Multi-Phase Wireless Sensor Networks
Carlos Ramos, Zita Maria Almeida do Vale 인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 12 Pages
인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 2011, 제 1권 제 1호 3 17-28 (12 pages)
Gait is a new biometric aimed to recognize a subject by the manner in which they walk. Gait has several advantages over other biometrics, most notably that it is a non-invasive and perceivable at a distance when other biometrics are obscured. We present a new area based metric, called gait masks, which provides statistical data intimately related to the gait of the subject. Early results are promising with a recognition rate of 90% on a small database of human subjects. In addition to this, we... -
윌리엄 허셜의 적외선의 발견과 특성에 관한 논문들에 기초한 초등과학영재 프로그램 개발
권오종 공주교육대학교 초등교육연구원 교육논총 22 Pages
공주교육대학교 초등교육연구원 교육논총 2020, 57권 1호 1 1-22 (22 pages)
본 논문에서는 1800년 1월 1일자 Phil. Trans. R. Soc. Lond.에 게재된 Frederick William Herschel의 적외선에 관한 4편의 시리즈 논문을 기반으로 초등과학영재 프로그램을 개발하였다. 프로그램 구성을 위한 학습모형은 Joseph Renzulli의 삼부심화학습모형을 사용하였다. 삼부심화학습모형의 제1부에서는 적외선의 다양한 응용을 제시하여 학생들이 적외선에 대해 관심을 갖도록 유도하였으며, 제2부에서는 적외선의 발견에 관한 실험과 광학적 특성을 파악하는 실험을 수행하도록 하였다. 제3부에서는 2부에서 획득한 지식과 기법을... -
Denitration Effect by Non-thermal Plasma
Hyun Choon Kang, Yong Yi Park, Myung Whan Hwang, Seong Joong Kim, In sung Woo, Yeun Seon Kim 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2005, 제 2권 1호 4 31-46 (8 pages)
condition was optimized in order to maximize the NO decomposition efficiency. The highest NO decomposition efficiency obtained was 94.3% at the power consumption of 19.8 W for the frequency of 10 kHz. NO decomposition efficiency increased with increasing residence time or with decreasing initial concentration of NO. As the thickness and melting point of the electrode increased, the NO decomposition efficiency was improved. It was also found that CH4 was an effective additive in this experiment. -
글라이딩 아크 플라즈마를 이용한 PFCs 분해
이종문, 손홍선, 최경수, 박동화 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2011, 제 8권 1호 3 18-25 (8 pages)
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시설노인의 불안, 우울, 수면장애 및 피로에 대한 향요법 손마사지의 적용 효과
이선영 한국기초간호학회 Journal of Korean Biological Nursing Science 8 Pages
한국기초간호학회 Journal of Korean Biological Nursing Science 2011, Vol.13 No.1 5 29-36 (8 pages)
현대사회의 경제성장 및 의학의 발달은 국민건강을 증진시키고 평균수명을 연장시키는 데 기여해왔다. 2000년 중반에는 65세 이상의 노인의 비율이 이미 7.1%가 넘었으며 2020년경에는 14.3%가 되어 본격적인 고령화 사회가 될 것으로 전망하고 있다. 이러한 고령화 사회로의 변화로 인해 다양한 노인문제에 대한 학계의 관심이 고조되고 있다. 그러나 노인 인구의 증가에 비해 도시의 핵가족화 및 개인주의 문화 형태는 노인을 부양해야할 인구 층을 크게 감소시켰을 뿐 아니라 단독가구노인 증가 및 독거거주노인의 증가를 가져오게... -
Children’s Music Education Support System using Sensor Data, Video Images, and Sound Data
Kimio Shintani, Takehito Yasutaniya, Hirohide Haga, Shigeo Ka 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 16 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2007, Vol.1 No.2 6 113-128 (16 pages)
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Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
of CF. The obtained Raman spectra indicate that the outer surface of CF evolves from turbostratic structures into a three-dimensional ordered state after being irradiated by a laser. The X-ray diffraction data revealed that the growth of crystallite was parallel to the fiber axis, and the interlayer spacing d002 decreased from 0.353 to 0.345 nm. The results of scanning electron microscopy revealed that the surface of irradiated CFs was rougher than that of the unirradiated ones and there were... -
Optical sensitivity of DNA-dispersed single-walled carbon nanotubes within cement composites under mechanical load
Jin Hee Kim, Inkyu Rhee, Yong Chae Jung, Sumin Ha, Yoong Ahm Kim 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 12 90-96 (7 pages)
We demonstrated the sensitivity of optically active single-walled carbon nanotubes (SWCNTs) with a diameter below 1 nm that were homogeneously dispersed in cement composites under a mechanical load. Deoxyribonucleic acid (DNA) was selected as the dispersing agent to achieve a homogeneous dispersion of SWCNTs in an aqueous solution, and the dispersion state of the SWCNTs were characterized using various optical tools. It was found that the addition of a large amount of DNA prohibited the... -
Interconnected meso/microporous carbon derived from pumpkin seeds as an efficient electrode material for supercapacitors
Mayakrishnan Gopiraman, Somasundaram Saravanamoorthy, Seung-Hyun Kim, Ill-Min Chung 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 10 73-81 (9 pages)
electrode materials. The resultant porous carbons (PS-600, PS-700, PS-800, and PS-900) were utilized as electrode material for supercapacitors. To our delight, the PS-900 demonstrated a maximum specific capacitance (Cs) of 303 F g?1 in 1.0 M H2SO4 at a scan rate of 5 mV. The electrochemical impedance spectra confirmed the poor electrical resistance of the electrode materials. Moreover, the stability of the PS-900 was found to be excellent (no significant change in the Cs even after 6000 cycles). -
Relationships between dielectric properties and characteristics of impregnated and activated samples of potassium carbonate- and sodium hydroxide-modified palm kernel shell for microwave-assisted activation
Norulaina Alias, Muhammad Abbas Ahmad Zaini, Mohd Johari Kamaruddin 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 9 62-72 (11 pages)
The aim of this work was to evaluate the dielectric properties of impregnated and activated palm kernel shells (PKSs) samples using two activating agents, potassium carbonate (K2CO3) and sodium hydroxide (NaOH), at three impregnation ratios. The materials were characterized by moisture content, carbon content, ash content, thermal profile and functional groups. The dielectric properties were examined using an open-ended coaxial probe method at various microwave frequencies (1?6 GHz) and... -
Preparation of photoresist-derived carbon micropatterns by proton ion beam lithography and pyrolysis
Hui-Gyun Nam, Jin-Mook Jung, In-Tae Hwang, Junhwa Shin, Chang-Hee Jung, Jae-Hak Choi 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 8 55-61 (7 pages)
Carbon micropatterns (CMs) were fabricated from a negative-type SU-8 photoresist by proton ion beam lithography and pyrolysis. Well-defined negative-type SU-8 micropatterns were formed by proton ion beam lithography at the optimized fluence of 1×1015 ions cm?2 and then pyrolyzed to form CMs. The crosslinked network structures formed by proton irradiation were converted to pseudo-graphitic structures by pyrolysis. The fabricated CMs showed a good electrical conductivity of 1.58×102 S cm?1 and a... -
A modified electrode by a facile green preparation of reduced graphene oxide utilizing olive leaves extract
Abeer Baioun, Hassan Kellawi, Ahamed Falah 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 7 47-54 (8 pages)
work a green method of reducing graphene oxide (rGO) by an inexpensive, effective and scalable method using olive leaf aqueous extract as the reducing agent, was used to produce rGO. Both GO and rGO were prepared and investigated by ultraviolet and visible spectroscopy, Fourier-transform infrared, scanning electron microscopy, atomic force microscopy, thermogravimetric analysis, cyclic voltammetry, X-ray photoelectron spectra, electrochemical impedance spectroscopy and powder X-ray diffraction. -
Effect of the surface modification using MWCNTs with different L/D by two different methods of deposition on the IFSS of single carbon fiber-epoxy resin composite
Minerva L. Herrera-Sosa, Alex Valadez-Gonz?lez, Humberto V?zquez-Torres, Pierre G. Mani-Gonz?lez, Pedro J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 3 18-27 (10 pages)
Multiwall carbon nanotubes (MWCNT) with two different (L/D) aspect ratios (7±2 μm/140±30 nm and 0.5?2 μm/8?15 nm) were surface treated using nitric acid (HNO3) and polyethyleneimine (PEI) prior to their deposition on carbon fibers (CF). Before the hierarchical reinforcement with CF-MWCNT, the CFs were treated with 3-glycidoxypropyltrimethoxysilane, a coupling agent (Z6040) and with poly(amidoamine) (PAMAM) a dendrimer containing an ethylenediamine core and amine surface groups. The MWCNT... -
Study on properties of eco-friendly reduction agents for the reduced graphene oxide method
Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 1 1-9 (9 pages)
We studied the basic properties and fabrication of reduced graphene oxide (rGO) prepared using eco-friendly reduction agents in the graphene solution process. Hydrazine is generally used to reduce graphene oxide (GO), which results in polluting emissions as well as fixed nitrogen functional groups on different defects in the graphene sheets. To replace hydrazine, we developed eco-friendly reduction agents with similar or better reducing properties, and selected of them for further analysis. In... -
Capacitance behaviors of conducting polymer-coated graphene nanosheets composite electrodes containing multi-walled carbon nanotubes as additives
Hoe-Seung Kim, Yongju Jung, Seok Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 9 63-68 (6 pages)
of fossil fuels. To resolve this problem, various studies on efficient energy storage devices have been undertaken. Electronic technologies are increasingly used in electronic products and systems, and they require effective energy storage [1,2]. Supercapacitors are energy storage devices with high power density and long cycle life, and have been spotlighted in recent years because of their promising applications in portable devices, electric vehicles, transportation systems, digital devices. -
Dispersions of partially reduced graphene oxide in various organic solvents and polymers
Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 8 55-62 (8 pages)
We report on the dispersion state of partially reduced graphene oxide (PRGO) in organic solvents, namely methyl ethyl ketone, ethyl acetate, methylene chloride, toluene, and xylene, by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the... -
Fabrication of nitrogen doped ordered mesoporous carbon derived from glucosamine with hybrid capacitive behaviors
Deyi Zhang, Mei Han, Yubing Li, Bing Wang, Yi Wang, Kunjie Wang, Huixia Feng 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 2 9-16 (8 pages)
This paper introduces a nitrogen-doped ordered mesoporous carbon (NOMC) derived from glucosamine with hybrid capacitive behaviors, achieved by successfully combining electrical double-layer capacitance with pseudo-capacitance behaviors. The nitrogen doping content of the fabricated NOMC reached 7.4 at% while its specific surface area (SBET) and total pore volume reached 778 m2 g?1 and 1.17 cm3 g?1, respectively. A dual mesoporous structure with small mesopores centered at 3.6 nm and large... -
Li-ion battery anodes from ginkgo leaf-derived nanoporous carbons rich in redox-active heteroatoms
Na Rae Kim, Hong Joo An, Young Soo Yun, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 13 110-114 (5 pages)
Lithium-ion batteries (LIBs) have attracted increasing attention as a sustainable power source due to the rapid growth in mobile electronics and electric automobile markets, driven by increasing environmental awareness [1-4]. The electrochemical performance of LIBs is strongly dependent on the active electrode materials. Therefore, their continuing advanced development is of key importance to meet the expectations of the market [5-7]. Graphite, commonly used in LIB anodes, forms binary graphite... -
High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch
Poo Reum Choi, Sang-Gil Kim, Ji Chul Jung, Myung-Soo Kim 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 8 70-80 (11 pages)
Activated carbons (ACs) have been used as electrode materials of electric double-layer capacitors (EDLC) due to their high specific surface areas (SSA), stability, and ecological advantages. In order to make high-energy-density ACs for EDLC, petroleum pitch (PP) precarbonized at 500?1000°C in N2 gas for 1 h was used as the electrode material of the EDLC after KOH activation. As the pre-carbonization temperature increased, the SSA, pore volume and gravimetric capacitance tended to decrease, but... -
Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI)
Jiaqi Duan, Baohua Zhang, Huailin Fan, Wenzhong Shen, Shijie Qu 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 7 60-69 (10 pages)
hydrothermal carbonization following ZnCl2 chemical activation. Scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, solid state 13C nuclear magnetic resonance (NMR) spectra and X-ray photoelectron spectroscopy were used to characterize the nitrogen-doped carbon nanosheet structure and composition. The removal of Cr(VI) by the N-doped carbon nanosheets was investigated. The results showed that the maximum removal capacity for chromium of 188 mg/g was...
