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전체 선택해제
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Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
Jeong-Hyun Ryu, Jae-Sung Kwon, Heng Bo Jiang, Jung-Yul Cha, Kwang-Mahn Kim 대한치과교정학회 The Korean Journal of Orthodontics 10 Pages
대한치과교정학회 The Korean Journal of Orthodontics 2018, 제 48권 제 5호 5 316-325 (10 pages)
Objective: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs). Methods: Specimens were fabricated using four types of thermoplastic materials with different thicknesses under a thermal vacuum. Transparency, water absorption and solubility, surface hardness, and the results of three-point bending and tensile tests were evaluated... -
Report on a case treated with lingual multibracket appliance
Hee-Moon Kyung 대한치과교정학회 The Korean Journal of Orthodontics 11 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 6호 6 705-715 (11 pages)
reduced because of advances in lingual bracket systems, improved indirect bonding technique and the development of more flexible wires. There has been a marked increase in the number of adults desiring orthodontic treatment over recent years and many of these patients tend to seek invisible orthodontic appliances due to esthetic reasons. Although the lingual multibracket treatment is not ideal, this form of treatment is currently the best option for the patients with esthetic concerns. Here, I... -
상악 전치부 견인시 치근 흡수 발생 양상에 관한 연구
기세호(Se-Ho Kee), 이진우(Jin-Woo Lee), 차경석(Kyung-Suk Cha) 대한치과교정학회 The Korean Journal of Orthodontics 7 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 4호 10 441-447 (7 pages)
본 연구는 상악 전돌증을 보이는 환자에게서 상악 제1소구치를 발치한 후 견인시 bracket 종류에 따른 치근흡수 차이, 이동양상에 따른 치근 흡수 차이, 각 치아간에 따른 전치부의 치근 흡수 정도를 연구하기 위해 단국 대학교 부속 치과 병원 교정과에 내원한 남녀 환자 32명을 대상으로 연구하여 다음과 같은 결과를 얻었다. 1. 상악 전치 후방 견인시 치근 흡수를 보이지 않는 것은 31.77%, 약간의 흡수는 33.33%, 치근의 1/4이하 흡수는 23.96%, 1/4이상은 10.94%를 보였다. 2. Apical tipping, lingually bodily movement, ant-post... -
불소가 산부식된 법랑질의 재석회화에 미치는 영향에 관한 연구
김진한(Jin-Han Kim), 이기수(Ki-Soo Lee) 대한치과교정학회 The Korean Journal of Orthodontics 11 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 4호 6 389-399 (11 pages)
치과교정장치의 장착을 위하여 치아법랑질표면을 산부식하는 것은 일반화된 술식이며, 산부식된 법랑질표면은 재석회화되어 자연적으로 정상 상태를 회복하는 연구 보고 되어 왔다. 이 연구의 목적은 산부식된 법랑질 표면의 재석회화에 불소가 미치는 영향을 실험적으로 관찰하여 재석회화의 일면을 구명하는데 있다. 교정치료목적으로 발거한 사람 제1소구치 치관을, 불소함유 석회화용액과 불소무함유 석회화용액에 12시간, 1일, 3일, 7일, 14일, 28일, 42일간 담구어 보관한 후, 법랑질표면의 미세경도측정과 주사전자현미경 관찰을... -
과도한 하악성장을 보인 구순구개열 환자의 장기간 교정치료
장영광, 정동화 대한구순구개열학회 대한구순구개열학회지 6 Pages
대한구순구개열학회 대한구순구개열학회지 2018, 제 21권 1호 6 29-34 (6 pages)
One of the typical facial growth pattern after reconstruction surgery is retruded maxilla due to the surgical scar. Therefore, orthopedic treatment of cleft lip and palate patient is necessary for most of the cleft cases. Facemask is the choice of the orthopedic appliances for retruded maxilla. In this case a male patient with right side unilateral cleft lip and palate has been gone through phase I treatment with maxillary expansion and protraction and phase two with extraction and class III... -
Cytotoxic Activity and Structure Activity Relationship of Ceramide Analogues in Caki-2 and HL-60 Cells
YongJinKim, EunAeKim, UyDongSohn, ChulBuYim, ChaeukIm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2010, Vol.14 No.6 14 441-447 (7 pages)
B13, a ceramide analogue, is a ceramidase inhibitor and induces apoptosis to give potent anticancer activity. A series of thiourea B13 analogues was evaluated for their in vitro cytotoxic activities against human renal cancer Caki-2 and leukemic cancer HL-60 in the MTT assay. Some compounds (12, 15, and 16) showed stronger cytotoxicity than B13 and C6-ceramide against both tumor cell lines, and compound (12) gave the most potent activity with IC50 values of 36 and 9</SUB>ՌM,... -
Optimized Immunohistochemical Analysis of Cerebellar Purkinje Cells Using a Specific Biomarker, Calbindin D28k
ByungJooKim, SoYeonLee, HyungWooKim, Eun-JungPark, JunKim, SangJeongKim, InsukSo, Ju-HongJeon 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.5 7 373-378 (6 pages)
Cerebellar Purkinje cells (PCs) play a crucial role in motor functions and their progressive degeneration is closely associated with spinocerebellar ataxias. Although immunohistochemical (IHC) analysis can provide a valuable tool for understanding the pathophysiology of PC disorders, the method validation of IHC analysis with cerebellar tissue specimens is unclear. Here we present an optimized and validated IHC method using antibodies to calbindin D28k, a specific PC marker in the cerebellum. To... -
고령 환자의 즉시 하중 임프란트의 성공률 및 변연골 변화에 관한 후향적 연구
전용민 대한치과이식임플란트학회 Journal of Dental Implant Research 14 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2009, 제 28권 1호 2 10-23 (14 pages)
대한민국의 65세 이상의 고령인구는 2008년 7월 현재 전체 인구의 10.3%를 차지하고 있다. 또한, 통계청의 장 래인구추계에 따르면, 대한민국은 지난 2000년에 이미 65세 이상 인구가 총인구에서 차지하는 비중이 7.2%에 이르러‘고령화 사회’에 들어섰으며, 오는 2019년에는 이 비율이 14%를 넘어‘고령사회’에 진입할 것으로 전 망하고 있다1). -
Surface analysis of failed implants
Su-Gwan Kim, Young-Jong Kim, Yong-Min Kim, Young-Kyun Kim 대한치과이식임플란트학회 Journal of Dental Implant Research 7 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2004, 제 23권 1호 1 1-7 (7 pages)
Knowledge of the concept of osseointegration has enhanced the success of dental implants owing to improved understanding of the concept of bone stress and bone response. Longitudinal clinical studies report 10-year successrates of 81-85% for implants in the maxilla and 98-99% for implants in the anterior mandible1). In 1989, the main causes of implant failure were the selection of inappropriate patients and the accumulation of residue owing to the use of improper prosthetic restoration... -
Biocontrol Activity of Aspergillus terreus ANU-301 against Two Distinct Plant Diseases, Tomato Fusarium Wilt and Potato Soft Rot
Hyong Woo Choi, S. M. Ahsan 한국식물병리학회 The Plant Pathology Journal 13 Pages
한국식물병리학회 The Plant Pathology Journal 2022, 38권 1호 4 33-45 (13 pages)
To screen antagonistic fungi against plant pathogens, dual culture assay (DCA) and culture filtrate assay (CFA) were performed with unknown soil-born fungi. Among the different fungi isolated and screened from the soil, fungal isolate ANU-301 successfully inhibited growth of different plant pathogenic fungi, Colletotri- chum acutatum, Alternaria alternata, and Fusarium oxysporum, in DCA and CFA. Morphological character- istics and rDNA internal transcribed spacer sequence analysis identified... -
Antimicrobial Cyclic Peptides for Plant Disease Control
한국식물병리학회 The Plant Pathology Journal 11 Pages
한국식물병리학회 The Plant Pathology Journal 2015, 31권 1호 1 1-11 (11 pages)
Antimicrobial cyclic peptides derived from microbes bind stably with target sites, have a tolerance to hydrolysis by proteases, and a favorable degradability under field conditions, which make them an attractive proposition for use as agricultural fungicides. Antimicrobial cyclic peptides are classified according to the types of bonds within the ring structure; homodetic, heterodetic, and complex cyclic peptides, which in turn reflect diverse physicochemical features. Most antimicrobial cyclic... -
Identification and Characterization of Expansins from Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae)
한국식물병리학회 The Plant Pathology Journal 9 Pages
한국식물병리학회 The Plant Pathology Journal 2012, 28권 4호 8 409-417 (9 pages)
We identified two novel expansin (EXP) genes in the expressed sequence tag database of Bursaphelenchus xylophilus, designated as Bx-EXPB2 and -EXPB3. Novel Bx-EXPBs encoded 150 amino acids and their similarities in coding sequence were 70.7?84.0% to the previously reported EXPB1 of B. xylophilus. Bx-EXPB2 and Bx-EXPB3 were clustered with Bx-EXPB1 and Bm- EXPB1, respectively, forming the independent phylogeny with other nematode EXPs. All identified Bx-EXPBs contained the signal peptide and were... -
가축분뇨 중 돈분을 이용한 성형장치별 고체연료 성형특성에 관한 연구
김흥수, 김민철, 김민아, 이재정 한국열환경공학회 한국열환경공학회 학술대회지 10 Pages
한국열환경공학회 한국열환경공학회 학술대회지 2017년 춘계 30 227-236 (10 pages)
우리나라 가축분뇨 발생량은 2014년 기준 약 175.6천 m3/일로, 이중 대부분이 퇴·액 비화로 처리되고 있다. 따라서 본 연구에서는 가축분뇨 에너지화를 위해 가축분뇨 중 돈분을 대상으로 현재 활용되고 있는 플랫다이스 및 링다이스 성형장치를 이용한 성형 실험을 수행하여 각 장치별 성형특성을 확인하고 생산되는 펠렛이 고체연료 품질 기준 에 부합하기 위한 장치별 투입 가능한 돈분 원료의 조건을 확인해보고자 하였다. 실험 결과 플랫다이스 성형장치의 경우 수분 17.58 wt.% ~ 24.23 wt.%의 시료를 성형 하여 수분 감량이 최소... -
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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Relationship of Parental Stress Levels and Selected Child Cognitive Processes of Grade Two Students
Josben Romuald B. Pablo, Marison R. Dy 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 21 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2018, Vol.12 No.1 5 81-101 (21 pages)
Parents experience various stressors as they perform their roles in the family and these may influence child development. The study aimed to determine the relationship of parenting stress levels on selected cognitive processes of Grade Two students in public and private schools. Parent-respondents accomplished a questionnaire to gather socio-demographic data and parental stress levels while three psychometric tests were used to assess visual immediate memory, learning, and working memory of the... -
The Power of Harmony: Insights from a Korean Children’s Community-Based Chorus
Hae Min Yu 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 23 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2016, Vol.10 No.1 2 21-43 (23 pages)
This study examines a Korean children’s community-based chorus within the US context. Through an in-depth examination of group musical activities and interviews of Korean early childhood educators and Korean immigrant parents within the sociocultural framework, this study makes visible the meanings of engaging in a community-based children’s musical experience. Findings indicate that both groups of early childhood educators and Korean parents found that engaging in a community-based chorus... -
영유아용 말지각 검사 개발을 위한 문장 분석 연구
장선아, 이민혜 한국청각언어재활학회 Audiology and Speech Research 15 Pages
한국청각언어재활학회 Audiology and Speech Research 2017, 제 13권 제 2호 8 161-175 (15 pages)
구어 의사소통은 청감각을 통한 말지각 과정을 거쳐 이루어 지며, 정상적인 말과 언어의 발달을 위해서는 듣기 능력, 특히 말지각 능력이 확보되어야 한다. Blamey et al.(2001)은 언어능 력과 청력역치보다 말지각 능력이 구어 발달과 더 높은 상관을 보이는 변수라 하였다. 청각장애가 있는 경우, 제한된 청력으로 인해 소리지각과 말지각 능력에 부정적인 영향을 받을 수 있기 때문에 구어 발달을 포함한 의사소통 발달을 위한 진단 및 중재 과정에서 말지각 능력에 대한 정확한 검사가 반드시 필요하다. 말지각 검사는 들려오는... -
Lyocell-based activated carbon fibers improved the adsorption of harmful gas properties when produced via dual-simultaneous treatments
Byong Chol Bai, Ji Sun Im, Young-Seak Lee 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 10 69-73 (5 pages)
In gas adsorption processes, activated carbon fibers (ACFs) are used for the adsorption of the harmful gases that are generated by coal or oil combustion, and they have been widely studied [1,2]. ACFs have been used for harmful gas removal because of their specific surface area, micropores, reproducibility, safety, and processing ability, which are beneficial properties for a wide range of applications [3,4]. -
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)
The compressive strength and electrical resistance of pitch-based carbon fiber (CF) in cementitious materials are explored to determine the feasibility of its use as a functional material in construction. The most widely used CFs are manufactured from polyacrylonitrile (PAN-based CF). Alternatively, short CFs are obtained in an economical way using pitch as a precursor in a melt-blown process (pitch-based CF), which is cheaper and more eco-friendly method because this pitch-based CF is basically... -
Extraction and characterization of lignin from black liquor and preparation of biomass-based activated carbon therefrom
Daeyeon Kim, Jinsil Cheon, Jeonghoon Kim, Daekyun Hwang, Ikpyo Hong, Oh Hyeong Kwon, Won Ho Park, Donghwan Cho 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 14 81-88 (8 pages)
In the present study, biomass-based lignin was extracted from industrial waste black liquor and the extracted lignin was characterized by means of attenuated total reflectance- Fourier transform infrared spectroscopy and 1H-nuclear magnetic resonance spectroscopy. The extracted lignin was carbonized at different temperatures and then activated with steam at 850oC. The extracted lignin in powder state was transformed into a bulky carbonized lignin due to possible fusion between the lignin... -
Formation of nanojoints between carbon nanotubes and copper nanoparticles
Jagjiwan Mittal, Kwang Lung Lin 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 11 86-92 (7 pages)
Exceptional properties and a one dimensional structure make carbon nanotubes (CNTs) a promising candidate for future applications in the electronic industry [1-3]. Because of their smaller dimensions and higher conductivity as compared to copper, multi-walled carbon nanotubes (MWCNT) may increase the bandwidth density of global interconnects [4]. They demonstrate charge carrier mean free paths between 500 nm and 10 μm as compared to 40 nm in metals. CNTs can carry exceptionally high current... -
Study of complex electrodeposited thin film with multi-layer graphene-coated metal nanoparticles
Young-Lae Cho, Jung-woo Lee, Chan Park, Young-il Song, Su-Jeong Suh 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 8 68-73 (6 pages)
measure the bonding characteristics and estimate the number of layers in the graphene films. The resistivity of the bare-electrodeposited copper thin film (BETF) was 2.092 × 10?6 Ω·cm, and the resistivity of the CETF after the addition of 300 ppm MGCNs was decreased by 2% to ~2.049 × 10?6 Ω·cm. The corrosion resistance of the BETF was 9.306 Ω, while that of the CETF was increased to 20.04 Ω. Therefore, the CETF with MGCNs can be used in interconnection circuits for printed circuit boards... -
Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber
Jung Dam Kim, Jae-Seung Roh, Myung-Soo Kim 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 6 51-60 (10 pages)
Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to 1600oC to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size (La) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800... -
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)
Carbon/carbon (C/C) composites are acknowledged as high performance materials because of their good mechanical properties such as wear resistance, even at the higher temperature, due to their low thermal expansion [1-5]. Their hardness and light weight in addition to their superior mechanical properties 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... -
Improving dispersion of multi-walled carbon nanotubes and graphene using a common non-covalent modifier
Youbin Kwon, Wonbo Shim, Seung-Yeol Jeon, Ji-Ho Youk, Woong-Ryeol Yu 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 8 53-61 (9 pages)
The reportedly synergistic effects of carbon nanotubes (CNTs) and graphene hybrids have prompted strong demand for an efficient modifier to enhance their dispersion. Here, we investigated the ability of poly(acrylonitrile) (PAN) to overcome the van der Waals interaction of multi-walled CNTs (MWCNTs) and graphene by employing a simple wrapping process involving ultrasonication and subsequent centrifugation of PAN/MWCNT/graphene solutions. The physical wrapping of MWCNTs and graphene with PAN was... -
Morphologies and surface properties of cellulose-based activated carbon nanoplates
Seulbee Lee, Min Eui Lee, Min Yeong Song, Se Youn Cho, Young Soo Yun, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 5 32-38 (7 pages)
In this study, cellulose nanoplates (CNPs) were fabricated using cellulose nanocrystals obtained from commercial microcrystalline cellulose (MCC). Their pyrolysis behavior and the characteristics of the product carbonaceous materials were investigated. CNPs showed a relatively high char yield when compared with MCC due to sulfate functional groups introduced during the manufacturing process. In addition, pyrolyzed CNPs (CCNPs) showed more effective chemical activation behavior compared with... -
Effect of fiber-matrix adhesion on the fracture behavior of a carbon fiber reinforced thermoplastic-modified epoxy matrix
H.J. Carrillo-Escalante, A. ?lvarez-Castillo, A. Valadez-Gonz?lez, P. J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 6 47-56 (10 pages)
In this study, the fracture behavior of a thermoplastic-modified epoxy resin reinforced with continuous carbon fibers for two levels of fiber-matrix adhesion was performed. A carbon fiber with commercial sizing was used and also treated with a known silane, (3-glycidoxy propyl trimethoxysilane) coupling agent. Toughness was determined using the double cantilever test, together with surface analysis after failure using scanning electron microscope. The presence of polysulfone particles improved...
