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Study on determination of durability analysis process and fatigue damage parameter for rubber component
Moon. Seong-In, Cho. Il-Je, Woo. Chang-Su, Kim. Wan-Doo 대한기계학회 Journal of mechanical science and technology 7 Pages
대한기계학회 Journal of mechanical science and technology 2011, Vol.25 No.5 1159-1165 (7 pages)
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Effect of phosphorus deficiency on erythrocytic morphology and function in cows
Ziwei Zhang, Mingyu Bi, Jie Yang, Haidong Yao, Zhonghua Liu, Shiwen Xu 대한수의학회 Journal of Veterinary Science 8 Pages
대한수의학회 Journal of Veterinary Science 2017, 제 18권 제 3호 10 333-340 (8 pages)
The aim of this study was to evaluate the influence of phosphorus (P) deficiency on the morphological and functional characteristics of erythrocytes in cows. Forty Holstein-Friesian dairy cows in mid-lactation were randomly divided into two groups of 20 each and were fed either a low-P diet (0.03% P/kg dry matter [DM]) or a control diet (0.36% P/kg DM). Red blood cell (RBC) indices results showed RBC and mean corpuscular hemoglobin decreased while mean corpuscular volume increased significantly... -
Canine model of ischemic stroke with permanent middle cerebral artery occlusion: clinical features, magnetic resonance imaging, histopathology, and immunohistochemistry
Joon-Hyeok Jeon, Hae-Won Jung, Hyo-Mi Jang, Jong-Hyun Moon, Ki-Tae Park, Hee-Chun Lee, Ha-Young Lim, Jung-Hyang Sur, By 대한수의학회 Journal of Veterinary Science 11 Pages
대한수의학회 Journal of Veterinary Science 2015, 제 16권 제 1호 10 75-85 (11 pages)
The purpose of this study was to identify time-related changes in clinical, MRI, histopathologic, and immunohistochemical findings associated with ischemic stroke in dogs. Additionally, the association of cerebrospinal fluid (CSF) and tissue levels of interleukin (IL)-6 with clinical prognosis was assessed. Ischemic stroke was induced by permanent middle cerebral artery occlusion (MCAO) in nine healthy experimental dogs. The dogs were divided into three groups... -
Comparison between open and closed methods of herniorrhaphy in calves affected with umbilical hernia
Bibek Chandra Sutradhar*, Mohammad Farhad Hossain, Bhajan Chandra Das, Gonhyung Kim, Mohammad Alamgir Hossain 대한수의학회 Journal of Veterinary Science 5 Pages
대한수의학회 Journal of Veterinary Science 2009, 제 10권 제 4호 11 343-347 (5 pages)
Umbilical hernias in calves commonly present to veterinary clinics, which are normally secondary to failure of the normal closure of the umbilical ring, and which result in the protrusion of abdominal contents into the overlying subcutis. The aim of this study was to compare the suitability of commonly-used herniorrhaphies for the treatment of reducible umbilical hernia in calves. Thirty-four clinical cases presenting to the Veterinary Teaching Hospital, Chittagong Veterinary and Animal Sciences... -
Push-in Head Restraining Apparatus for Intracranial Self Stimulation Tasks in Rats
MootaekRoh, Il-SungJang, Maan-GeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2014, Vol.18 No.2 3 103-108 (6 pages)
Head restraining is an experimental technique that firmly secures the animal’s head to a fixation apparatus for the precise control and sensing of behaviors. However, procedural and surgical difficulties and limitations have been obstructing the use of the technique in neurophysiological and behavioral experiments. Here, we propose a novel design of the head-restraining apparatus which is easy to develop and convenient for practical use. Head restraining procedure can be completed by sliding... -
Mechanism of Relaxation Via TASK-2 Channels in Uterine Circular Muscle of Mouse
SeungHwaHong, RohyunSung, YoungChulKim, HikaruSuzuki, WoongChoi, YeonJinPark, IllWoonJi, ChanHyungKim, SunChulMyung6, MooYeolLee, TongMook 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2013, Vol.17 No.4 14 359-365 (7 pages)
Plasma pH can be altered during pregnancy and at labor. Membrane excitability of smooth muscle including uterine muscle is suppressed by the activation of K＋ channels. Because contractility of uterine muscle is regulated by extracellular pH and humoral factors, K＋ conductance could be connected to factors regulating uterine contractility during pregnancy. Here, we showed that TASK-2 inhibitors such as quinidine, lidocaine, and extracellular acidosis produced contraction in uterine circular... -
Voltage-dependent Ca2＋ Current Identified in Freshly Isolated Interstitial Cells of Cajal (ICC) of Guinea-pig Stomach
YoungChulKim, HikaruSuzuki, Wen-XieXu, HikaruHashitani, WoongChoi, Hyo-YungYun, Seon-MeePark6, SeiJinYoun6, Sang-JeonLee, SangJinLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.6 6 323-330 (8 pages)
The properties of voltage dependent Ca2＋ current (VDCC) were investigated in interstitial cells of Cajal (ICC) distributed in the myenteric layer (ICC-MY) of guinea-pig antrum. In tissue, ICC-MY showed c-Kit positive reactions and produced driving potentials with the amplitude and frequency of about 62 mV and 2 times min−1, respectively, in the presence of 1</SUP>ՌM nifedipine. Single ICC-MY isolated by enzyme treatment also showed c-Kit immunohistochemical reactivity. These... -
Effects of Prostaglandin E2 on the Spontaneous Contractions and Electrical Activities of the Antral Circular Muscle in Guinea-pig Stomach
JongYoonKim, SungJoonKim, TongMookKang, SangJinLee, JaeYeoulJun, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.3 11 361-368 (8 pages)
The spontaneous contractions of gastric smooth muscles are regulated by slow waves, which are modulated by both nervous system and humoral agents. This study was designed to examine the effects of prostaglandin E2 (PGE2) on the contractile and electrical activities of antral smooth muscles in guinea-pig stomach, using an intracellular recording technique. To elucidate the underlying mechanism for its effect on contractility, ionic currents were also measured using a whole-cell patch clamp... -
백서태자두개관에서 분리한 세포의 약리학적 및 생화학적 특성에 관한연구
한남수(Nam-Soo Han), 정동균(Dong-Kyun Cheong), 모리 마사카주(Masakazu，Mori) 대한약리학회 대한약리학잡지 16 Pages
대한약리학회 대한약리학잡지 1990, 제 26권 제 2호 12 193-208 (16 pages)
Transforming growth factor β(TGF-β)는 많은 세포의 증식, 분화 및 여러가지 세포기능에 대해 다양한 조절기능을 갖고 있는 multifunctional polypeptide로 알려져 있다. TGF-β는 골기질에 상당량 존재하며 골조직 대사에 대해 광범위한 영향을 나타낸다. 여러가지 연구결과에 의해 기질과 연관된 TGF-β는 골세포 자체의 산물로 여겨지고 있으나 골조직세포군중 어느종류의 세포가 TGF-β를 형성하는지에 대해서는 논란이 되고 있다. 본 연구는 TGF-β를 형성하는 골조직세포를 규명하고 TGF-β가 서로 다른 세포들에 미치는 영향을... -
흰쥐 뇌 미토콘드리아에 의한 superoxide radical의 생성과 이 radical이 미토콘드리아 및 미토콘드리아 외 물질에 대한 독작용과 그 기전에 관한 연구
노재규(Jae-Kyu Roh), 표장근(Jang-Geun Pyo), 정명희(Myung-Hee Chung), 임정규(Jung-Kyoo Lim), 명호진(Ho-Jin Myung) 대한약리학회 대한약리학잡지 15 Pages
대한약리학회 대한약리학잡지 1985, 제 21권 제 1호 2 12-26 (15 pages)
흰쥐 뇌 미토콘드리아에 의한 O2-⋅ 의 생성과 이 radical의 유해작용 및 그 작용기전을 알아보기 위하여 본실험을 수행하였다. Succinate와 antimycin존재하에서 미토콘드리아는 O2-⋅을 생성하였으며 이는 SOD-inhibitable NBT환원으로 확인되었다. 동일 조건에서 H2O2는 일차생성물인 O2-⋅의 dismutation으로 생성됨을 알수 있었다. 상기조건에서 미토콘드리아의 막지질이 파괴되었고 반응액에 첨가된 isocitrate dehydrogenase와 적혈구에 각각 불활성화와 용혈이 초래되었다. 이같은 작용은 Fe++이 있을때만 관찰... -
The Excitatory Mechanism of Substance P in the Antral Circular Muscle of Guinea Pig Stomach
Jun, Jae-Yeoul, Kim, Sung-Joon, Choi, Youn-Baik, Kim, Ki-Whan 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 1호 5 51-60 (10 pages)
This study was carried out to elucidate the excitatory mechanisms of Substance P in the antral circular muscle, using isometric contraction recording, conventional microelectrode method and whole-cell patch clamp technique. Substance P produced tonic and phasic contractions in a dose-dependent manner and depolarized membrane potential with increased amplitude of slow waves in muscle strips. Voltage-dependent Ca2+ currents were increased by the application of Substance P from a holding potential... -
Effects of Lemakalim, a Potassium Channel Opener, on the Contractility and Electrical Activity of the Antral Circular Muscle in Guinea-Pig Stomach
Kim, Sung-Joon, Jun, Jae-Yeoul, Choi, Youn-Baik, Kim, Ki-Whan, Kim, Woo-Gyeum 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 1호 4 37-50 (14 pages)
Synthetic potassium channel openers (KCOs) are agents capable of opening K-channels in excitable cells. These agents are known to have their maximal potency in the smooth muscle tissue, especially in the vascular smooth muscle. Much attention has been focused on the type of K-channel that is responsible for mediating the effects of KCOs. As the KCO-induced changes are antagonized by glibenclamide, an KATP (ATP-sensitive K-channel) blocker in the pancreatic β-cell, KATP was suggested to be the... -
Effect of Dopamine on the Ca2+-dependent K+ currents in Isolated Single Gastric Myocytes of the Guinea-pig
Rhee, Poong-Lyul, Lee, Sang-Jin, Kim, Sung-Joon, So, In-Suk, Hwang, Sang-Ik, Kim, Ki-Whan 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 3 139-150 (12 pages)
We have reported that dopamine potentiates spontaneous contractions dose-dependently in guinea-pig antral circular muscle strips (Hwang et al, 1991). To clarify the underlying excitatory mechanism of dopamine on the gastric smooth muscle, the effects of dopamine on voltage-dependent Ca2+ currents and Ca2+ -dependent K+ currents were observed in enzymatically dispersed guinea-pig gastric myocytes using the whole-cell voltage-clamp technique. Experiments were also done using isometric tension... -
Effects of Noradrenaline on the Spontaneous Contraction and Ionic Current in the Antral Circular Muscle of Guinea-pig Stomach
Jun, Jae-Yeoul, Lee, Sang-Jin, Kim, Sung-Joon, Suh, Jae-Yul, So, In-Suk, Hwang, Sang-Ik, Kim, Ki-Whan 대한생리학회 대한생리학회지 8 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 1 115-122 (8 pages)
There is evidence that noradrenaline enhances spontaneous contractions dose-dependently in guinea-pig antral circular muscle. To investigate the mechanism of this excitatory action, slow waves and membrane currents were recorded using conventional microelectrode techniques in muscle strips and the whole cell patch clamp technique in isolated gastric myocytes. On recording slow waves, noradrenaline (10-5 M) induced the hyperpolarization of the membrane potential, although the shape of the slow... -
The Contractile and Electrical Responses of Guinea-pig s Gastric Smooth Muscle to Serotonin
Lee, Sang-Jin, Hwang, Sang-Ik, Kim, Ki-Whan 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1991, 제 25권 제 2호 4 133-146 (14 pages)
of the slow wave, when the spike component was potentiated and the second component was inhibited. 6) In the antral circular muscle strips the membrane potential was slightly hyperpolarized, but the membrane resistance was not changed. From the above results following conclusions could be made. 1) Serotonin inhibits spontaneous contractions of the circular muscle layer and it increases those of the longitudinal one, irrespective of the gastric region. 2) In the guinea-pig stomach there exists a... -
Cholinergic Control of Pancreatic Secretion: The Effects of Atropine on Plasma Cholecystokinin and Secretin Release
Jo, Yang-Hyeok, Rhie, Duck-Joo, Chang, Young-Soon, Hahn, Sang-June, Sim, Sang-Soo, Kim, Myung-Suk, Kim, Chung-Chin 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1991, 제 25권 제 1호 3 27-36 (10 pages)
Generally, it has been known that cholecystokinin (CCK) release into the plasma is under cholinergic control, but secretin release is not. Thus in anesthetized dogs we studied the effect of atropine (50 μg/kg followed by 50 μg/kg/hr) on pancreatic secretion and plasma concentrations of bioactive CCK and immunoreactive secretin in response to intraduodenal perfusion of sodium oleate (1, 3 and 9 mmol/hr). The volume, protein output and bicarbonate output of the secretion were increased by sodium... -
치아-임프란트 지지 가철성 국소의치에서 하악골에서 발생하는 응력의 광탄성학적 분석
정다운, 심혜영 대한치과이식임플란트학회 Journal of Dental Implant Research 19 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2009, 제 28권 2호 2 10-28 (19 pages)
하악의 대구치는 저작의 중추적인 역할을 하는 부위로 맹출 이후 가장 많은 교합력을 받는 부위이다. 이로 인해, 구강내에서 가장 먼저 상실되는 치아이기도 하다1,2). 하악에서 양측성으로 구치부가 탈락하여 후방연장 국소 의치를 제작하는 경우 많은 임상적인 문제점이 발생한다. 유리단 부위 치조제의 계속적인 흡수, 구치부의 불안정 으로 인한 교합의 부조화, 연조직의 통증 등이 발생하게 된다3-6). 이는 후방연장 국소의치의 역학적인 불리함에 서 기인한다고 할 수 있다7). 유리단 부위가 길어질수록 mechanical advantage는... -
Salicylic Acid as a Safe Plant Protector and Growth Regulator
Young Mo Koo, A Yeong Heo, Hyong Woo Choi 한국식물병리학회 The Plant Pathology Journal 10 Pages
한국식물병리학회 The Plant Pathology Journal 2020, 36권 1호 1 1-10 (10 pages)
Since salicylic acid (SA) was discovered as an elicitor of tobacco plants inducing the resistance against Tobacco mosaic virus (TMV) in 1979, increasing reports suggest that SA indeed is a key plant hormone regulating plant immunity. In addition, recent studies indicate that SA can regulate many different responses, such as tolerance to abiotic stress, plant growth and development, and soil microbiome. In this review, we focused on the recent findings on SA’s effects on resistance to biotic... -
Control of Basal Stem Rot Disease in Oil Palm by Supplementation of Calcium, Copper, and Salicylic Acid
한국식물병리학회 The Plant Pathology Journal 11 Pages
한국식물병리학회 The Plant Pathology Journal 2016, 32권 5호 3 396-406 (11 pages)
Continuous supplementation of mineral nutrients and salicylic acid (SA) as foliar application could improve efficacy in controlling basal stem rot (BSR) disease in oil palm seedling. It is revealed from the results that the highest disease severity index (58.3%) was recorded in T8 treatments at 9 months after inoculation. The best disease control was achieved by T7 treatments (calcium/copper/SA [Ca/Cu/SA]) (5.0%) followed by T1 (5.5%), T5 (5.8%), T3 (8.3%), T6 (8.3%), T4 (13.3%), and T2 (15.8%)... -
폐기물 성상분석 및 에너지 잠재량 예측 표준 TOOL
이보원 한국열환경공학회 한국열환경공학회 학술대회지 8 Pages
한국열환경공학회 한국열환경공학회 학술대회지 2016년 춘계 44 144-151 (8 pages)
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A Kinetic Analysis of the Thermal Degradation of Pyrolytic Heavy Oils obtained from Kiln Pyrolysis Process
Kyong Hwan Lee, Woo-Teck Kwo, Sea Cheon Oh 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2011, 제 8권 2호 1 1-8 (8 pages)
The kinetic analysis of the thermal degradation of pyrolytic heavy oils obtained from mixed waste plastics by kiln pyrolysis process has been studied by conventional thermogravimetric technique with various heating rates in nitrogen atmosphere. Results of kinetic analysis show that the activation energies are 24.4~26.5 kJ/mol and the reaction orders are 1.0~1.25, respectively. To verify the effectiveness of the kinetic analysis method used in this work, the experimental values were compared with... -
Virtual Reality Technologies for Medical Training, Surgical Simulation, and the Delivery of Health Care
진승아 한국헬스커뮤니케이션학회 헬스커뮤니케이션연구 32 Pages
한국헬스커뮤니케이션학회 헬스커뮤니케이션연구 2010, Vol.2 No.1 3 67-98 (32 pages)
Objectives: This article provides an extensive literature review of the use of virtual reality (VR) systems in medicine. Focusing on applications of VR to medical training, this paper addresses the advantages and drawbacks of VR-based surgical simulation and discusses agendas for future research. Methods: Motivations for deploying VR-based medical devices and operating settings are discussed. Various case studies that report positive outcomes of employing VR-based surgical simulators and... -
Young Children’s Participation in a Nature-based Program: Impacts of NATURKIND Program on Young Children’s Development
Ju hu Kim, Mark Baldwin 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 16 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2011, Vol.5 No.1 6 123-138 (16 pages)
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Adsorption capability of activated carbon synthesized from coconut shell
Md Shariful Islam, Bee Chin Ang, Samira Gharehkhani, Amalina Binti, Muhammad Afifi 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 1 1-9 (9 pages)
Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m2/g with a pore volume of 1.032 cm3/g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The... -
Phenylethynyl-terminated polyimide, exfoliated graphite nanoplatelets, and the composites: an overview
Donghwan Cho, Lawrence T. Drzal 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 1 1-11 (11 pages)
exfoliated graphite nanoplatelets (xGnP) on the properties of PETI-5 matrix composites are also reviewed. The dynamic mechanical and thermal properties and the electrical resistivity of xGnP/PETI-5 composites are characterized. The effect of liquid rubber amine-terminated poly(butadiene-co-acrylonitrile) (ATBN)-coated xGnP particles incorporated into epoxy resin on the toughness of xGnP/epoxy composites is examined in terms of its impact on Izod strength. This paper provides an extensive overvi... -
A review: role of interfacial adhesion between carbon blacks and elastomeric materials
Min-Joo Kang, Young-Jung Heo, Fan-Long Jin, Soo-Jin Park 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 1 1-10 (10 pages)
used as reinforcing materials in advanced rubber composites. The mechanical properties of CB-reinforced rubber composites are mostly controlled by the extent of interfacial adhesion between the CBs and the rubber. Surface treatments are generally performed on CBs to introduce chemical functional groups on its surface. In this study, we review the effects of various surface treatment methods for CBs. In addition, the preparation and properties of CB-reinforced rubber composites are discussed. -
Effects of cross-linking methods for polyethylene-based carbon fibers: review
Kwan-Woo Kim, Hye-Min Lee, Jeong-Hun An, Byoung-Suhk Kim, Byung-Gak Min, Shin-Jae Kang, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 24 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 2 147-170 (24 pages)
In recent decades, there has been an increasing interest in the use of carbon fiber reinforced plastic (CFRP) in aerospace, renewable energy and other industries, due to its low weight and relatively good mechanical properties compared with traditional metals. However, due to the high cost of petroleum-based precursors and their associated processing costs, CF remains a specialty product and as such has been limited to use in high-end aerospace, sporting goods, automotive, and specialist... -
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... -
Overlook of carbonaceous adsorbents and processing methods for elemental mercury removal
Kyong-Min Bae, Byung-Joo Kim and Soo-Jin Park 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.4 2 238-246 (9 pages)
People have been concerned about mercury emissions for decades because of the extreme toxicity, persistence, and bioaccumulation of methyl Hg transformed from emitted Hg. This paper presents an overview of research related to mercury control technology and identifies areas requiring additional research and development. It critically reviews measured mercury emissions progress in the development of promising control technologies. This review provides useful information to scientists and engineers... -
Recent Advances in Carbon-Nanotube-Based Epoxy Composites
Fan-LongJin, Soo-JinPark 한국탄소학회 Carbon Letters 13 Pages
한국탄소학회 Carbon Letters 2013, Vol.14 No.1 1 1-13 (13 pages)
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Effects of the ASR-embedded Dictionary App Use on College Students in EFL Pronunciation Class
Hyun Il-sun 이화여자대학교 교과교육연구소 교과교육학연구 14 Pages
이화여자대학교 교과교육연구소 교과교육학연구 2018, 제 22권 6호 4 400-413 (14 pages)
This study explored the effects of the use of ASR-embedded dictionary app in providing corrective feedback on EFL college students pronunciation. During the six-week instruction, students of the ARS-based feedback group (n = 20) practiced their English pronunciation via the ARS-embedded dictionary app and those of the Peer-feedback group (n = 20) worked in pairs. Comparisons were made between pre- and post-test scores and the students responses to a follow-up questionnaire were analyzed by... -
승용차 서브프레임용 고무부시의 동강성 예측
안태길, 구준환, 김주성, 이용헌, 김기주, 최병익, 이학주, 우창수, 김경식, Ahn. Tae-Kil, Goo. Jun-Hwan, Kim. Joo-Sung, Lee. Yong-Heon, Kim. Kee-Joo, Choi. Byung-Ik, Lee. Hak 한국소음진동공학회 한국소음진동공학회논문집 8 Pages
한국소음진동공학회 한국소음진동공학회논문집 2010, Vol.20 No.10 907-914 (8 pages)
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실험에 의한 방진고무의 동특성에 관한 연구
김완두, 김기세, 권재도, 우창수, Kim. W.D., Kim. K.S., Kwon. J.D., Woo. C.S. 한국고무학회 엘라스토머 9 Pages
한국고무학회 엘라스토머 2002, Vol.37 No.3 183-191 (9 pages)
우수한 신장성과 탄성복원 능력으로 여러 산업분야에 방진, 제진, 충격흡수 및 완충재료로 널리 사용되고 있는 고무재료에 대하여 주파수, 변형률 진폭 및 온도변화가 동특성에 미치는 영향을 실험을 통하여 검토하였다. 동특성 시험은 5종류의 경도에 대하여 인장.압축시험과 전단시험용의 천연고무 시험 편으로 비 공진법으로 수행하였다. 시험결과, 경도가 높을수록 동적 특성 값들이 크게 나타났으며 저장탄성계수와 손실계수는 주파수가 증가할수록 서서히 증가하였으며 변형률 진폭이 커질수록 감소하였다. 또한, 온도 특성을... -
모터팬 방진고무부품의 노화수명 예측
김완수, 우창수, 조상준, 김완두, Kim. W.S., Woo. C.S., Cho. S.J., Kim. W.D. 한국고무학회 엘라스토머 8 Pages
한국고무학회 엘라스토머 2002, Vol.37 No.2 107-114 (8 pages)
청정실(Clean room)에 사용되는 환기팬용 모터의 방진고무부품의 수명을 예측하기 위해서 가속 열 노화 시험을 수행하였다. 방진고무부품은 EPDM으로 만들었다. 노화 수명을 판단하기 위한 한계점을 20%의 압축 영구 줄음률로 하여 절대 온도의 역수 값으로 아레니우스 선도를 유도하였다. 아레니우스 관계식으로부터 방진고무부품의 다양한 온도에서의 수명과 활성화에너지를 구하였다. 그리고 수명을 판단하는데 있어 상당한 시간을 대체할 수 있는 가속 시험법을 설계하였다. 또한 방진고무부품에 첨가되는 노화 방지제가 수명에... -
다축하중이 작용하는 방진고무부품 피로손상 파라미터 결정에 관한 연구
문성인, 우창수, 김완두, Moon. Seong-In, Woo. Chang-Su, Kim. Wan-Doo 한국고무학회 Elastomers and composites 7 Pages
한국고무학회 Elastomers and composites 2012, Vol.47 No.3 194-200 (7 pages)
고무재료는 배합조건에 따라 기계적 거동이 다르기 때문에 피로수명평가를 위해 부품소재에 대한 물성데이터 확보가 선행되어야 한다. 그러나 모든 종류의 배합조건을 고려하여 표준화된 재료물성을 확보하는 것은 현실적으로 불가능하다. 따라서 본 연구에서는 최소한의 제한된 실험으로부터 피로수명평가를 위한 입력물성을 선택하기 위한 방법을 제시하였으며, 피로수명 평가를 위한 최적 피로손상 파라미터를 결정하였다. 이러한 결과를 활용하여 부품의 피로수명 평가결과와 내구시험결과를 비교한 후, 본 연구에서 제안된 피로수명...
