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학생들이 사용한 엔진 구동형 Ni-Ti file systems의 근관 성형 효율 비교
강문성,김현철,허복,박정길 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.1
본 연구의 목적은 학생들이 사용한 세 가지 Ni-Ti 파일의 성형효율을 비교하고, 각 파일의 사용 경험 유무에 따른 차이를 비교하여 치과대학생을 위한 교육에 적합한 종류를 선택하는데 도움을 얻고자하는 것이다. Ni-Ti 파일 사용 경험이 없는 학생 50명과 Ni-Ti 파일을 사용한 근관치료 경력이 2년 이상인 경험자 10명이 세 종류의 Ni-Ti file - ProFile^(®) (PF), HeroShaper^(®) (HS), K3™ (K3) -을 사용하여 180개의 근관 모형을 성형하였다. 근관성형 시간 및 기구 변형, 근관 이형성을 조사하고 성형 전후 상을 중첩하여 근관 삭제폭, 근관변위량과 중심변위율을 1, 3, 5 ㎜에서 분석하였다. 1. 근관 성형시간은 HS군이 가장 빨랐으며, 총 삭제량은 모든 지점에서 K3군이 다른 군보다 컸다 (P<0.05). 2. 세 군 모두 1, 3 ㎜에서 외측 변이를 보였고, 1 ㎜ 지점에서 PF군이 가장 안정적이었다 (P< 0.05). 3. 중심변위율은 1, 3 ㎜에서 HS, PF군이 K3군보다 작았다. 5 ㎜ 지점에서 PF군이 가장 작았고, PF군 3 ㎜에서 학생은 경험자보다 유의하게 작았다 (P < 0.05). The purpose of this study was to compare the shaping ability of three Ni-Ti file systems used by dental students or the experts and consequently to aid in choosing a proper systems for educational courses of dental students and beginners. Fifty students and ten dentists who have clinical experience over two years prepared 180 simulated root canals in resin blocks with three Ni-Ti systems: ProFile^(®) (PF), HeroShaper^(®) (HS), K3™ (K3). After preparation, the Ni-Ti files were evaluated for distortion and canal preparation time was recorded. The images of pre- and post-instrumented canals were scanned and superimposed. Amounts of increased canal widths,deviation, and centering ratio were calculated at apical 1, 3 and 5 ㎜ levels and statistical analysis was performed. The results were as follows: 1. HS showed the shortest preparation time and instrumented canal width in K3 was significantly larger than other groups (P< 0.05). 2. At 1 and 3 ㎜ levels, all groups had outward deviation. In student group, at the 1 ㎜ level, PF had the least deviation (P< 0.05). 3. In the centering ratio, the PF had the best centering ability compared to the others at 5 ㎜ level. At 1 and 3 ㎜ level, HS and PF had better abilities than K3. Student group had better ratio than the expert at 3 ㎜ level with PF (P<0.05). Based on the results, it is surmised that the ProFile^(®) is the safest and most ideal instrument for students and beginners.〔J Kor Acad Cons Dent 31(1):1-10, 2006〕
Jeong, Kwang Ho,Lee, Hyeon Jeong,Simpson, Michael F.,Jeong, Sang Mun American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Graphene/MnO2 nano-composite was electrochemically synthesized for application to an electrode material for electrochemical supercapacitors. The nanosized needle-like MnO2 was obtained by use of a graphene substrate. The prepared composite exhibited an ideal supercapacitive behavior. A capacitance retention of 94% was achieved with a 4 h deposition time (an initial capacitance of 574 mF/cm(2) at a scan rate of 20 mV/s) and the retention declined with further deposition time. The results demonstrate enhanced contact between the electrode and electrolyte and improved power density as an electrochemical capacitor.</P>
A new mid-late maturing japonica rice variety Hyeonpum with a good grain quality and eating quality
Jeong-Ju Kim,Woon-Chul Shin,Mun-Sik Shin,Ki-Yeong Kim,Bo-Kyeong Kim,Jeong-Kwon Nam,Jong-Cheol Ko,Hyeon-Su Park,Ki-Yong Ha,Man-Kee Baek,So-Hyeon Baek,Young-Jun Mo,Woo-Jae Kim,Hyeon-Jung Kang,Jae-Kwon K 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
‘Hyeonpum’ is a new japonica rice variety developed by a cross breeding between Iksan469 having a good canopy architecture and Sindongjin and Musashino 7 having a good eating-quality with a view to develop a new variety having high quality of grain and palatability by the rice breeding team of Rice Breeding and Cultivation Research Division, Department of Rice and Winter Cereal Crop, NICS, RDA in 2012. The heading date of this variety is August 18 and later than that of check variety, Nampyeongbyeo, by four days. ‘Hyeonpum’ has 74cm of culm length and 101 spikelets per panicle. This variety showed resistance to bacterial leaf blight and rice stripe virus, but susceptible to leaf blast and planthoppers. The milled rice of this variety exhibits translucent and very clear non-glutinous endosperm. ‘Hyeonpum’ has much better palatability of cooked rice than that of Nampyeongbyeo. The whole grain rate of milled rice and milled rice recovery of ‘Hyeonpum’ are slightly higher than those of Nampyeongbyeo as 91.8% and 75.2% respectively. The yield of ‘Hyeonpum’ is 5.6 MT/ha in milled rice. ‘Hyeonpum’ could be adaptable to the southern part plain area of Pyeongtaek and southwestern costal areas in Korea.
Jeong, Hyun,Bang, Seungho,Oh, Hye Min,Jeong, Hyeon Jun,An, Sung-Jin,Han, Gang Hee,Kim, Hyun,Kim, Ki Kang,Park, Jin Cheol,Lee, Young Hee,Lerondel, Gilles,Jeong, Mun Seok American Chemical Society 2015 ACS NANO Vol.9 No.10
<P>We propose a semiconductor–insulator–semiconductor (SIS) heterojunction diode consisting of monolayer (1-L) MoS<SUB>2</SUB>, hexagonal boron nitride (h-BN), and epitaxial p-GaN that can be applied to high-performance nanoscale optoelectronics. The layered materials of 1-L MoS<SUB>2</SUB> and h-BN, grown by chemical vapor deposition, were vertically stacked by a wet-transfer method on a p-GaN layer. The final structure was verified by confocal photoluminescence and Raman spectroscopy. Current–voltage (<I>I</I>–<I>V</I>) measurements were conducted to compare the device performance with that of a more classical p–n structure. In both structures (the p–n and SIS heterojunction diode), clear current-rectifying characteristics were observed. In particular, a current and threshold voltage were obtained for the SIS structure that was higher compared to that of the p–n structure. This indicated that tunneling is the predominant carrier transport mechanism. In addition, the photoresponse of the SIS structure induced by the illumination of visible light was observed by photocurrent measurements.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-10/acsnano.5b04233/production/images/medium/nn-2015-042335_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b04233'>ACS Electronic Supporting Info</A></P>
The Factors Associated with Contact Burns from Therapeutic Modalities
Jeong-Hyeon Mun,서정훈,Jong-Hyun Jeon,Yun-Jae Jung,장기언,양형태,임해준,조용석,김도헌,허준,김종현,전욱 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.5
Objective To understand the injury pattern of contact burns from therapeutic physical modalities.Method A retrospective study was done in 864 patients with contact burns who discharged from our hospital from January 2005 to December 2008. The following parameters were compared between patients with contact burns from therapeutic modalities and from other causes: general characteristics, burn extent, cause of burn injury, place of occurrence, burn injury site, treatment methods, prevalence of underlying disease, and length of hospital stay were compared between patients with contact burns. Results Of the 864 subjects, 94 patients were injured from therapeutic modalities. A hot pack (n=51) was the most common type of therapeutic modality causing contact burn followed by moxibustion (n=21), electric heating pad (n=16), and radiant heat (n=4). The lower leg (n=31) was the most common injury site followed by the foot & ankle (n=24), buttock & coccyx (n=9), knee (n=8), trunk (n=8), back (n=6), shoulder (n=4), and arm (n=4). Diabetes mellitus was associated with contact burns from therapeutic modalities; the odds ratio was 3.99. Injuries took place most commonly at home (n=56), followed by the hospital (n=33), and in other places (n=5). Conclusion A hot pack was the most common cause of contact burns from therapeutic modalities, and the lower leg was the most common injury site. Injuries took place most commonly at home. The patients with contact burns from therapeutic modalities showed high correlation to presence of diabetes mellitus. These results would be helpful for the prevention of contact burns due to therapeutic modalities.
Metal–Insulator–Semiconductor Diode Consisting of Two-Dimensional Nanomaterials
Jeong, Hyun,Oh, Hye Min,Bang, Seungho,Jeong, Hyeon Jun,An, Sung-Jin,Han, Gang Hee,Kim, Hyun,Yun, Seok Joon,Kim, Ki Kang,Park, Jin Cheol,Lee, Young Hee,Lerondel, Gilles,Jeong, Mun Seok American Chemical Society 2016 NANO LETTERS Vol.16 No.3
<P>We present a novel metal-insulator-semiconductor (MIS) diode consisting of graphene, hexagonal BN, and monolayer MoS2 for application in ultrathin nano electronics. The MIS heterojunction structure was fabricated by vertically stacking layered materials using a simple wet chemical transfer method. The stacking of each layer was confirmed by confocal scanning Raman spectroscopy and device performance was evaluated using current versus voltage (I-V) and photocurrent measurements. We clearly observed better current rectification and much higher current flow in the MIS diode than in the p-n junction and the metal-semiconductor diodes made of layered materials. The I-V characteristic curve of the MIS diode indicates that current flows mainly across interfaces as a result of carrier tunneling. Moreover, we observed considerably high photocurrent from the MIS diode under visible light illumination.</P>
Park, Hyeon Soo,Hwang, Yong Hyeon,Kim, Mun Ki,Hong, Gyeong Eun,Lee, Ho Jeong,Nagappan, Arulkumar,Yumnam, Silvia,Kim, Eun Hee,Heo, Jeong Doo,Lee, Sang Joon,Won, Chung Kil,Kim, Gon Sup Japan Society for Bioscience, Biotechnology, and A 2015 Bioscience, Biotechnology, and Biochemistry Vol.79 No.1
<P>Grifola frondosa (GF), distributed widely in far east Asia including Korea, is popularly used as traditional medicines and health supplementary foods, especially for enhancing the immune functions of the body. To extend the application of GF polysaccharides (GFP) for atopic dermatitis (AD), we investigated the effects of GFP on the 2,4-dinitrochlorobenzene-induced AD-like skin lesion in NC/Nga mice. GFP treatment significantly reduced the dorsa skin dermatitis score and combination treatment with GFP, and dexamethasone has a synergistic effect in AD-like skin lesion by reduced Serum IgE, mast cells infiltration, and cytokines expression. These results indicate that GFP suppressed the AD-like skin lesions by controlling the Th-1/Th-2-type cytokines in NC/Nga mice. These findings strongly suggest that GFP can be useful for AD patients as a novel therapeutic agent and might be used for corticosteroids replacement or supplement agent.</P>