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Joint Strength in High Speed Friction Stir Spot Welded DP 980 Steel
Saunders. Nathan, Miles. Michael, Hartman. Trent, Hovanski. Yuri, Hong. Sung-Tae, Steel. Russell 한국정밀공학회 International journal of precision engineering and manufacturing 8 Pages
한국정밀공학회 International journal of precision engineering and manufacturing 2014, Vol.15 No.5 841-848 (8 pages)
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Performance Study of Brazed Type cBN Grinding Wheel on Hardened Bearing Steel and High Speed Steel
Pal. Bhaskar, Chattopadhyay. Ajay Kumar, Chattopadhyay. Asit Baran 한국정밀공학회 International journal of precision engineering and manufacturing 6 Pages
한국정밀공학회 International journal of precision engineering and manufacturing 2012, Vol.13 No.5 649-654 (6 pages)
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Effects of Deposition Temperature and Time on the Surface Characteristics of TiN-coated High-speed Steel by Arc Ion Plating
Kim. Hae-Ji, Joun. Man-Soo 대한기계학회 Journal of mechanical science and technology 10 Pages
대한기계학회 Journal of mechanical science and technology 2007, Vol.21 No.4 575-584 (10 pages)
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The Effect of Retained Austenite Stability on High Speed Deformation Behavior of TRIP Steels
Choi. I. D., Kim. D. M., Kim. S. J., Bruce. D. M., Matlock. D. K., Speer. J. G 대한금속재료학회 Metals and materials international 7 Pages
대한금속재료학회 Metals and materials international 2006, Vol.12 No.1 13-19 (7 pages)
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Synthesis and characterization of carbon doped TiO₂ photocatalysts supported on stainless steel mesh by sol-gel method
JO. Tijani, OO. Fatoba, TC. Totito, WD. Roos, LF. Petrik 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 6 48-59 (12 pages)
This study synthesized pure anatase carbon doped TiO₂ photocatalysts supported on a stainless steel mesh using a sol-gel solution of 8% polyacrylonitrile (PAN)/dimethylformamide (DMF)/TiCl₄. The influence of the pyrolysis temperature and holding time on the morphological characteristics, particle sizes and surface area of the prepared catalyst was investigated. The prepared catalysts were characterized by several analytical methods: high resolution scanning electron microscopy (HRSEM), energy... -
Changes in pain, swelling, and range of motion according to physical therapy intervention after total knee arthroplasty in elderly patients
Eun-Kyung Noh, Chang-Sik An 물리치료재활과학회 Physical Therapy Rehabilitation Science 8 Pages
물리치료재활과학회 Physical Therapy Rehabilitation Science 2015, 제 4권 제 2호 4 79-86 (8 pages)
a steel goniometer was used to assess knee joint ROM. Results: As a result, the experimental group showed a statistically significant decrease in the pain and swelling, and a significant increase in knee flexion ROM after the intervention, compared to the control group (p<0.05). There was a significant improvement in pain, edema, and knee flexion and extension ROM in all subjects after intervention (p<0.05). Conclusions: According the results of this study, exercise in the experimental group is... -
Wheelchair martial arts practitioners have similar bone strength, sitting balance and self-esteem to healthy individuals
Shirley S. M. Fong, Shamay S. M. Ng, Anthony O. T. Li, X. Guo 물리치료재활과학회 Physical Therapy Rehabilitation Science 6 Pages
물리치료재활과학회 Physical Therapy Rehabilitation Science 2014, 제 3권 제 1호 5 27-32 (6 pages)
wave (speed of sound, m/s) traveling through the outer surface of the radial bone was measured and was then converted into a T-score and a Z-score. These ultrasound T-score and Z-score that represent bone strength; the maximum forward reaching distance in sitting (cm) that represents sitting balance; and the RSE total self-esteem score that indicates global self-esteem were used for analysis. Results: The results revealed that there were no statistically significant between-group differences for... -
Comparative study on the aflatoxin B1 degradation ability of rumen fluid from Holstein steers and Korean native goats
Santi Devi Upadhaya, Ha Guyn Sung, Chan Hee Lee, Se Young Lee, Sun Woo Kim, Kyung Jin Cho, Jong K. Ha* 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2009, 제 10권 제 1호 5 29-34 (6 pages)
method had no significant influence on degradability. In addition, aflatoxin degradation did not depend upon rumen fluid collection time after feeding, as no significant differences were observed. Finally, a comparison of two types of diet high in roughage found aflatoxin degradability in goats was higher with timothy hay opposed to rice straw, although individual variation existed. Thus, our findings showed the aflatoxin degradability is comparatively higher in goats compared to steers. -
Brainstem auditory evoked potential findings in a French bulldog with bilaterally congenital sensorineural deafness
Dae Gi An , Dong In Jung , Ha Jung Kim , Ji Houn Kang , Dong Woo Chang , Mhan Pyo Yang , Byeong Teck Kang 대한수의학회 Korean Journal of Veterinary Research(구 대한수의학회지) 3 Pages
대한수의학회 Korean Journal of Veterinary Research(구 대한수의학회지) 2013, 제 53권 제 4호 13 265-267 (3 pages)
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도재브라켓의 제거방법에 따른 법랑질표면의 주사전자현미경학적 관찰
박미숙(Mi-Suk Park), 윤영주(Young-Jooh Yoon), 김광원(Kwang-Won Kim) 대한치과교정학회 The Korean Journal of Orthodontics 10 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 5호 13 613-622 (10 pages)
도재브라켓의 제거방법에 따라 법랑질표면에 미치는 영향을 비교 평가하기 위하여 80개의 발거된 소구치를 대상으로 통법에 의해 도재브라켓을 부착시키고 일 주일후 각각 40개의 기계적 방법에 의한 제거군과 전기열전도 방법에 의한 제거군으로 구분하여 도재브라켓의 제거물 유도한 후, 그 탈락양상 및 도재브라켓과 법랑질 표면의 주사전자현미경 관찰을 시행하였으며, 전기열전도 방법에 의한 제거군을 다시 각각 10개씩 고속 tungsten carbide bur에 의한 연마군, 저속 sof-lex disc에 의한 연마군, 고속 resin polishing bur에... -
The efficacy of combination treatment of gabapentin and electro-acupuncture on paclitaxel-induced neuropathic pain
MinJoonKim, JiHwanLee, JoUngJang, FuShiQuan, SunKwangKim, WoojinKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2017, Vol.21 No.6 11 657-666 (10 pages)
Paclitaxel, a chemotherapeutic drug, induces severe peripheral neuropathy. Gabapentin (GBT) is a first line agent used to treat neuropathic pain, and its effect is mediated by spinal noradrenergic and muscarinic cholinergic receptors. Electro-acupuncture (EA) is used for treating various types of pain via its action through spinal opioidergic and noradrenergic receptors. Here, we investigated whether combined treatment of these two agents could exert a synergistic effect on paclitaxel-induced... -
Reduction of long-term potentiation at Schaffer collateral-CA1 synapses in the rat hippocampus at the acute stage of vestibular compensation
GyoungWanLee, JaeHyoKim, MinSunKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2017, Vol.21 No.4 8 423-428 (6 pages)
Vestibular compensation is a recovery process from vestibular symptoms over time after unilateral loss of peripheral vestibular end organs. The aim of the present study was to observe time-dependent changes in long-term potentiation (LTP) at Schaffer collateral-CA1 synapses in the CA1 area of the hippocampus during vestibular compensation. The input-output (I/O) relationships of fEPSP amplitudes and LTP induced by theta burst stimulation to Schaffer’s collateral commissural fibers were... -
Streptozotocin Diabetes Attenuates the Effects of Nondepolarizing Neuromuscular Relaxants on Rat Muscles
LinaHuang, DanChen, ShitongLi 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2014, Vol.18 No.6 3 461-468 (8 pages)
The hypothesis of this study was that diabetes-induced desensitization of rat soleus (SOL) and extensor digitorum longus (EDL) to non-depolarizing muscle relaxants (NDMRs) depends on the stage of diabetes and on the kind of NDMRs. We tested the different magnitude of resistance to vecuronium, cisatracurium, and rocuronium at different stages of streptozotocin (STZ)-induced diabetes by the EDL sciatic nerve-muscle preparations, and the SOL sciatic nerve-muscle preparations from rats after 4 and... -
Phellodendron amurense and Its Major Alkaloid Compound, Berberine Ameliorates Scopolamine-Induced Neuronal Impairment and Memory Dysfunction in Rats
BombiLee, BongjunSur, InsopShim, HyejungLee, Dae-HyunHahm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 11 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2012, Vol.16 No.2 1 79-89 (11 pages)
We examine whether Phellodendron amurense (PA) and its major alkaloid compound, berberine (BER), improved memory defects caused by administering scopolamine in rats. Effects of PA and BER on the acetylcholinergic system and pro-inflammatory cytokines in the hippocampus were also investigated. Male rats were administered daily doses for 14 days of PA (100 and 200 mg/kg, i.p.) and BER (20 mg/kg, i.p.) 30 min before scopolamine injection (2 mg/kg, i.p.). Daily administration of PA and BER improved... -
The Antinociceptive Effect of Sigma-1 Receptor Antagonist, BD1047, in a Capsaicin Induced Headache Model in Rats
YoungBaeKwon, YoungChanJeong, JungKeeKwon, JiSeonSon, KeeWonKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.6 3 425-429 (5 pages)
Intracranial headaches, including migraines, are mediated by nociceptive activation of the trigeminal nucleus caudalis (TNC), but the precise mechanisms are poorly understood. We previously demonstrated that selective blockage of spinal sigma-1 receptors (Sig-1R) produces a prominent antinociceptive effect in several types of pain models. This study evaluates whether the Sig-1R antagonist (BD1047) has an antinociceptive effect on capsaicin (a potent C-fiber activator) induced headache models in... -
Neuroprotective Effect of 8-OH-DPAT on Long-term Sequelae from Prenatal Ischemia in Rats
SeoulLee, TieYuanZhang, GunTaeKim, HeeSooKim, JongDooLee, JeongWonJahng, DongGooKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.6 3 293-297 (5 pages)
The role of 5-hydroxytryptamine (5-HT)1A receptor activity in prenatal ischemia was studied, by injecting 8-hydroxy-dipropylaminotetraline (8-OH-DPAT; 50μg/kg, s.c.), a 5-HT1A agonist on gestation day 17, and 30 min later inducing transient ischemia by ligating the uterine vessels for 30 min. On postnatal day 95, rats that had experienced prenatal ischemia showed impaired motor coordination and reduced concentration of 5-HT in the cerebellum compared with Sham-operated controls. In addition,... -
한국인 정신과 환자의 적혈구 및 혈장내 할로페리돌 농도에 관한 연구
이태경, 최우식, 양병환 대한신경정신의학회 신경정신의학 8 Pages
대한신경정신의학회 신경정신의학 1995, 제 34권 제 3호 18 830-837 (8 pages)
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Benztropine Mesylate가 Haloperidol 타액농도에 미치는 영향에 대한 연구
양병환, 사승언, 이승탁 대한신경정신의학회 신경정신의학 10 Pages
대한신경정신의학회 신경정신의학 1992, 제 31권 제 3호 4 478-487 (10 pages)
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고압액체 크로마토그래피 (HPLC)를 이용한 혈청 Haloperidol 정량분석
김영훈, 엄용섭 대한신경정신의학회 신경정신의학 9 Pages
대한신경정신의학회 신경정신의학 1987, 제 26권 제 3호 3 416-424 (9 pages)
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선천성 고혈압흰쥐에서 Endothelin과 Neuropeptide Y에 의한 심혈관계 반응에 Enalapril 장기처치가 미치는 영향
김권배(Kwon-Bae Kim), 손의동(Uy-Dong Sohn), 김중영(Choong Young Kim) 대한약리학회 대한약리학잡지 12 Pages
대한약리학회 대한약리학잡지 1992, 제 28권 제 1호 6 49-60 (12 pages)
선천성 고혈압 흰쥐(SHR)에서 endothelin-1(ET)과 neuropeptide Y(NPY) 투여에 의한 심혈관계 반응에 미치는 enallapril 장기처치의 영향을 검토하였다. 생후 6주의 SHR에 enalapril(3 mg/kg/day)을 6주간 투여하였을 때 고혈압 발현이 현저히 억제되었다(이하 enalapril 처치군). Enalapril 처치군에서 ET 및 NPY에 의한 승압반응이 현저히 억제되었지만, ET 측뇌실투여에 의한 혈압상승 및 NPY측뇌실 투여로 야기되는 혈압하강효과에는 영향이 없었다. 뇌척수제거 흰쥐에서 전기적 자극으로 야기되는 빈맥효과는 enalapril처치나... -
자궁세포 성장에 미치는 항에스트로젠제의 작용기전
이중빈(Jung Bin Lee), 윤미정(Mi-chung Yoon), 김창미(Chang-mee Kim), 홍사석(Sa Suk Hong), 유경자(Kyung-za Ryu) 대한약리학회 대한약리학잡지 10 Pages
대한약리학회 대한약리학잡지 1990, 제 26권 제 2호 9 167-176 (10 pages)
비스테로이드성 항에스트로젠제는 표적기관에서 estrogen 수용체와 상경적으로 결합하므로써 estrogen의 작용을 억제하는 것으로 알려져 있다. 비스테로이드성 항에스트로젠제는 대체로 triphenylethylene계로서 tamoxifen, clomiphene, LYl17018등이 있으며 표적기관에서 estrogen의 작용을 억제하기 때문에 estrogen과 관련된 질환을 치료하는데 이용되어 오고 있다. 본 연구에서는 생후 21-23일된 미성숙 흰쥐를 재료로 항에스트로젠제중 tamoxifen과 LY117018이 자궁세포 성장에 어떠한 영향을 미치며 어떠한 기전으로 estrogen의... -
Enhanced Efficacy of the Commissural Transmission between Lateral Giants in the Sensitization of Crayfish Escape Behavior
C.Lee, Sun-Hee 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1995, 제 29권 제 2호 11 291-300 (10 pages)
Lateral giant (LG)-mediated escape response of crayfish is sensitized by natural traumatic events. Such sensitization has previously been shown to be associated with increased transmission between primary afferents and sensory interneurons at the cholinergic synapse of LG escape reflex circuit. In the present study, it was firstly investigated as to whether transmission is also altered at other synapses of the LG-escape reflex circuit by traumatic shock-induced sensitization. Evidence that... -
Rapid Measurement of NH3 and Weak Acid Permeation Through Liposomes and Renal Proximal Tubule Membranes
Bae, Hae-Rahn, Suh, Duck-Joon, Lee, Sang-Ho 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 2호 11 203-214 (12 pages)
Using the methods of stopped-flow and epifluorescence microscopy with entrapped fluorophore, membrane permeability of NH3 and weak acids in liposomes, renal brush border (BBMV) and basolateral membrane vesicles (BLMV), and primary culture cells from renal proximal tubule was measured. Permeability coefficient (cm/sec) of NH3 was (2.9 X 10-2 in phosphatidylcholine liposome 25℃), 5.9 X 10-2 in renal proximal tubule cell (37℃), 4.0 X 10-2 and 2.4 X 10-2 in BBMV and BLMV (25℃), respectively.... -
New Higher Education for Human Resource Development in the 21st Century
Young-Gil Kim 한국교육정치학회 한국교육정치학회 학술대회지 25 Pages
한국교육정치학회 한국교육정치학회 학술대회지 정기 1 1-25 (25 pages)
Peace and prosperity in the 21st century depend on increasing the capacity of people to think and work on a global and intercultural basis. As technology opens borders, educational and professional exchange opens minds. -
Melting Characteristics of Simulated Non-combustible Radioactive Wastes in a Plasma Torch Melter System
Seung-Chul Park, Hyun-Je Cho, Cheon-Woo Kim 한국열환경공학회 열환경공학 7 Pages
한국열환경공학회 열환경공학 2011, 제 8권 3호 7 53-59 (7 pages)
slag tapping equipment, etc. Especially, the high-technology of a dual mode operation of plasma torch is realized with the invention of the KHNP-CRI patented power supply system. Among a series of dual mode performance tests, a 24-hour melting test for typical surrogate non-combustible waste is introduced in this paper. Electrical currents and voltages of the system was well confined under the operation limits at the test. And the slag melt was well stabilized without severe abnormal behavior as... -
The Appreciation and Experience of Digital Images- Critical Review of Use of Digital Images in Museum Environment -
Bokyung Koo 한국조형교육학회 조형교육 29 Pages
한국조형교육학회 조형교육 2009, 제 34집 2 1-29 (29 pages)
Art museums are dedicated to fostering an understanding of works of art, to conducting research, and to delivering results to the public. As technologies has introduced new challenges for museums, museum professionals have embraced new interactive technologies for their promise to offer aesthetic, cultural, and contextual information on exhibits, and to boost museum attendance. Museum visitors, expecially children and young adults, have responded enthusiastically to interactive exhibits, even... -
Developing Young Children\'s Scientific, Technological, and Social Competency through
Sumida ManabuFukada Shozo, Nakamura Hiroaki, Masukagami Masaru 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 10 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2007, Vol.1 No.1 4 81-98 (10 pages)
There is growing recognition that young children are familiar with nai\"ve physics, and construct their own theory about the natural world from early childhood. The research reported in this study focuses on intellectual play activities involving pendulums carried out by young children at a kinder - garten in Japan. Over the course of three weeks, five-year-old children partic - ipated in these pendulum play activities. They made pendulums by themselves, tried them out, compared them with... -
통제소재, 미래시간조망, 그릿(grit)과 지연의 관계 분석
한국교육학회 교육학연구 2016, 54권 4호 2 21-43 (23 pages)
지연은 중요한 일의 시작이나 완성을 의도적으로 미루는 경향성으로, 개인의 성취나 성장에 부정적인영향을 미치는 요인으로 작용한다. 지연은 대부분의 인간에서 나타나는 보편적인 경향성이지만, 아직까지 명쾌하게 이해되지 못하고 있다는 지적이 있다. 이 연구는 통제소재, 미래시간조망, 그릿(grit)이 지연에 어떤 영향을 주는지 규명하는 데 목적이 있다. 이 연구의 구체적인 목적은 첫째, 통제소재, 미래시간조망, 그릿과 지연 간의 상관관계를 분석하고, 둘째, 미래시간조망은 통제소재가 지연에 미치는 영향을 완전매개하는지,... -
Flexural, electrical, thermal and electromagnetic interference shielding properties of xGnP and carbon nanotube filled epoxy hybrid nanocomposites
Young Sil Lee, Yeon Ho Park, Kwan Han Yoon 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 6 41-46 (6 pages)
The microstructure, flexural properties, electrical conductivity, thermal conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of epoxy composites filled with multi-walled carbon nanotubes (CNTs), exfoliated graphite nanoplatelets (xGnPs) and CNT-xGnP hybrid filler were investigated. The EMI SE of the CNT-xGnP hybrid composite was higher than 25 dB at 100 MHz while that of the xGnP based composite was almost zero. The flexural modulus of the CNT-xGnP based epoxy... -
Catalytic hydrogenation-assisted preparation of melt spinnable pitches from petroleum residue for making mesophase pitch based carbon fibers
Dong Hun Lee, Jisu Choi, Young Se Oh, Yoong Ahm Kim, Kap Seung Yang, Ho Jin Ryu, Yong Jung Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 4 28-35 (8 pages)
We found that zeolite-induced catalytic hydrogenation under high hydrogen pressure contributed to a large variation in the properties of the pitches. As the hydrogen pressure increased, the C/H ratio decreased, and the solubility in n-hexane increased. The mesophase pitch with entirely anisotropic domains of flow texture exhibited good melt-spinnability. The mesophase carbon fibers obtained from the catalytically hydrogenated petroleum residue showed moderate mechanical properties. Key words:... -
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... -
Applications of carbon-based materials in solid phase micro-extraction: a review
Jian Guo, Soo-Jin Park, Long-Yue Meng, Xinghua Jin 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 2 10-17 (8 pages)
With continuous development in the field of sample preparation technology, solid phase micro-extraction (SPME) has been widely used in analytical chemistry for high extraction efficiency and convenient operation. Different materials lead to different extraction results. Among existing materials, carbon-based materials are still attracting attention from scientists due to their excellent physical and chemical properties as well as their modifiable surfaces, which could enhance the adsorption... -
Facile fabrication of electrospun polyacrylonitrile/ poly(vinylidene fluoride)-based carbon nanofibers for supercapacitor electrodes
Hyo In Lee, Soo-Jin Park 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 12 79-83 (5 pages)
energy sources are some of the most interesting alternatives being developed to solve the energy crisis [1,2]. At the same time, energy harvesting and storage devices are among the technologies with the highest potential to efficiently satisfy the energy requirements of compact electronic devices [3]. Among various energy storage devices, supercapacitors are the among the most intensely researched because of their high power density, long cycle retention, and rapid charge/discharge rates [4,5]. -
Mechanical and electrical properties of cement paste incorporated with pitch-based carbon fiber
Inkyu Rhee, Jin Hee Kim, Sang Hee Park, Sungho Lee, Bong Ryeul Ryu, Yoong Ahm Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 4 22-29 (8 pages)
and more eco-friendly method because this pitch-based CF is basically recycled from petroleum residue. In the construction field, PAN-based CFs in the form of fabric are used for rehabilitation purposes to reinforce concrete slabs and piers because of their high mechanical properties. However, studies have revealed that construction materials with pitch-based CF are not popular. This study explores the compressive strength and electrical resistances of a cement paste prism using pitch-based CF. -
Hole quality assessment of drilled CFRP and CFRP-Ti stacks holes using polycrystalline diamond (PCD) tools
Dave Kim, Aaron Beal, Kiweon Kang, Sang-Young Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 1 1-8 (8 pages)
drilled for the next 20 holes with the same drill bit. CFRP holes and CFRP-Ti stack holes were evaluated in terms of machined hole quality. The main tool wear mechanism of PCD drills is micro-fractures that occur when machining the Ti plate of the stack. Tool wear increases the instability and the operation temperature when machining the Ti plate. This results in high drilling forces, large hole diameter errors, high surface roughness, wider CFRP exit thermal damage, and taller exit Ti burrs. -
Effects of coal tar pitch addition on the wear behavior of carbon/carbon composites
Young Chan Jung, Duk Soo Kang, Kyong Yop Rhee, Soo Jin Park, David Hui 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 9 62-65 (4 pages)
at high temperature make C/C composites the best material to make brakes for aircrafts and other high weight vehicles. Accordingly, a number of studies have been conducted on the performance of C/C composites brake [6-9]. Generally, C/C composites are produced by the carbonization of the matrix precursors of carbon composites. However, some defects, such as porosity and micro-cracks, are also induced during carbonization, and these defects degrde the mechanical properties. Therefore, various... -
Effects of maleic anhydride content on mechanical properties of carbon fibers-reinforced maleic anhydride-grafted-polypropylene matrix composites
Hyun-Il Kim, Woong Han, Woong-Ki Choi, Soo-Jin Park, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 6 39-46 (8 pages)
In this work, the effects of maleic anhydride (MA) content on mechanical properties of chopped carbon fibers (CFs)-reinforced MA-grafted-polypropylene (MAPP) matrix composites. A direct oxyfluorination on CF surfaces was applied to increase the interfacial strength between the CFs and MAPP matrix. The mechanical properties of the CFs/MAPP composites are likely to be different in terms of MA content. Surface characteristics were observed by scanning electron microscope, Fourier transform infrared... -
NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group
Mi-Seon Park, Sangmin Lee, Min-Jung Jung, Hyeong Gi Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 3 19-25 (7 pages)
Activated carbon fiber (ACF) surfaces are modified using an electron beam under different aqueous solutions to improve the NO gas sensitivity of a gas sensor based on ACFs. The oxygen functional group on the ACF surface is changed, resulting in an increase of the number of non-carbonyl (-C-O-C-) groups from 32.5% for pristine ACFs to 39.53% and 41.75% for ACFs treated with hydrogen peroxide and potassium hydroxide solutions, respectively. We discover that the NO gas sensitivity of the gas sensor... -
The effect of the spinning conditions on the structure of mesophase pitch-based carbon fibers by Taguchi method
Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 11 89-98 (10 pages)
a reduced winding speed, and an increased extrusion pressure. The winding speed was found to be the most significant factor in relation to the fiber diameter. While it was observed that thicker carbon fiber generally shows improved preferred orientation, the most important variable affecting the preferred orientation was found to be the entry angle. As the entry angle decreased from 120° to 60°, the shear flow was enhanced to induce more ordered radial alignment of crystallite planes so as to... -
Mechanical interfacial adhesion of carbon fibers-reinforced polarized-polypropylene matrix composites: effects of silane coupling agents
Woong-Ki Choi, Hyun-Il Kim, Shin-Jae Kang, Young Sil Lee, Jong Hun Han, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 12 79-84 (6 pages)
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Bulk graphite: materials and manufacturing process
Sang-Min Lee, Dong-Su Kang and Jea-Seung Roh 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 1 135-146 (12 pages)
Graphite can be classified into natural graphite from mines and artificial graphite. Due to its outstanding properties such as light weight, thermal resistance, electrical conductivity, thermal conductivity, chemical stability, and high-temperature strength, artificial graphite is used across various industries in powder form and bulk form. Artificial graphite of powder form is usually used as anode materials for secondary cells, while artificial graphite of bulk form is used in steelmaking... -
Characterization and influence of shear flow on the surface resistivity and mixing condition on the dispersion quality of multi-walled carbon nanotube/polycarbonate nanocomposites
Young Sil Lee, Kwan Han Yoon 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 3 86-92 (7 pages)
Multi-walled carbon nanotube (MWCNT)/polycarbonate (PC) nanocomposite was prepared by direct melt mixing to investigate the effect of the shear rate on the surface resistivity of the nanocomposites. In this study, an experiment was carried out to observe the shear induced orientation of the MWCNT in the polymer matrix using a very simple melt flow indexer with various loads. The compression-molded, should be eliminated. MWCNT/PC nanocomposite sample exhibited lower percolation thresholds (at 0.8... -
Effects of pore structures on electrochemical behaviors of polyacrylonitrile-based activated carbon nanofibers by carbon dioxide activation
Hye-Min Lee, Hong-Gun Kim, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 10 71-76 (6 pages)
Activated carbon nanofibers (ACNF) were prepared from polyacrylonitrile (PAN)-based nanofibers using CO2 activation methods with varying activation process times. The surface and structural characteristics of the ACNF were observed by scanning electron microscopy and X-ray diffraction, respectively. N2 adsorption isotherm characteristics at 77 K were confirmed by Brunauer-Emmett-Teller and Dubinin-Radushkevich equations. As experimental results, many holes or cavernous structures were found on... -
Preparation and characterization of microporous NaOH activated carbons from hydrofluoric acid leached rice husk and its application for lead(II) adsorption
A. F. Hassan, A. M. Youssef 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 8 57-66 (10 pages)
Three activated carbons (ACs) were prepared using NaOH (N) as an activating agent. Hydrofluoric acid pre-leached rice husk was used as a precursor. After leaching, the precursor was washed with distilled water, dried, crushed, and then sieved; a size fraction of 0.3-0.5 mm was selected for carbonization in the absence of air at 600°C. The carbonization product (LC) was mixed with NaOH at ratios of 1:2, 1:3, and 1:4 (wt of LC: wt of NaOH) and the produced ACs after activation at 800°C were... -
Modifications of mechanical, thermal, and electrical characteristics of epoxy through dispersion of multi-walled carbon nanotubes in supercritical carbon dioxide
MGH ZAIDI, Sanjeev Joshi, Manoj Kumar, Deepak Sharma, Ashwin Kumar, Sarfaraz Alam, Prakash Sah 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2013, Vol.14 No.4 4 218-227 (10 pages)
