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Kim, Hyungki,Song, Intek,Park, Chibeom,Son, Minhyeok,Hong, Misun,Kim, Youngwook,Kim, Jun Sung,Shin, Hyun-Joon,Baik, Jaeyoon,Choi, Hee Cheul American Chemical Society 2013 ACS NANO Vol.7 No.8
<P>We report that high-quality single-layer graphene (SLG) has been successfully synthesized directly on various dielectric substrates including amorphous SiO<SUB>2</SUB>/Si by a Cu-vapor-assisted chemical vapor deposition (CVD) process. The Cu vapors produced by the sublimation of Cu foil that is suspended above target substrates without physical contact catalyze the pyrolysis of methane gas and assist nucleation of graphene on the substrates. Raman spectra and mapping images reveal that the graphene formed on a SiO<SUB>2</SUB>/Si substrate is almost defect-free and homogeneous single layer. The overall quality of graphene grown by Cu-vapor-assisted CVD is comparable to that of the graphene grown by regular metal-catalyzed CVD on a Cu foil. While Cu vapor induces the nucleation and growth of SLG on an amorphous substrate, the resulting SLG is confirmed to be Cu-free by synchrotron X-ray photoelectron spectroscopy. The SLG grown by Cu-vapor-assisted CVD is fabricated into field effect transistor devices without transfer steps that are generally required when SLG is grown by regular CVD process on metal catalyst substrates. This method has overcome two important hurdles previously present when the catalyst-free CVD process is used for the growth of SLG on fused quartz and hexagonal boron nitride substrates, that is, high degree of structural defects and limited size of resulting graphene, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-8/nn402847w/production/images/medium/nn-2013-02847w_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn402847w'>ACS Electronic Supporting Info</A></P>
Retrospective study on fractures in dogs
Gonhyung Kim*, Maruf Minar, Yawon Hwang, Minhyeok Park, Somin Kim, Cheongjin Oh, Seokhwa Choi 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.3
Patients referred to the Veterinary Medical Center at Chungbuk National University were analyzed. This study aimed to provide information to clinicians in Korea on the factors affecting fracture incidence in patients adapted to Korean companion animal culture. Eighty cases showingbone fractures were investigated from January, 2005 to December, 2011. Fractures were mainly observed in miniature dogs such as Yorkshire terrier (12%), Poodle (12%), and Maltese (9%). Almost 50% of all cases were less than 1 year old. Total bone fractures in summer and fall constituted 62%. Fracture incidence was higher in male dogs (54%) than female dogs (46%). Hindlimb fracture (37%) was the most common. Distribution of limb fractures was higher in the femur (19), followed by the tibia/fibula (15), radius/ulna (13), humerus (11), and mandible (8). Pelvic fracture was observed in 19 cases. Simple fracture (84%) was the most common fracture type, followed by comminuted fracture (16%). Distal portion was the most common fracture site in long bones (67%), followed by middle (26%) and proximal bones (7%). Fractures were mainly caused by traffic accidents (43%), whereas 28.5% of fractures were due to falling down. Plate & screw (26%) was the most common method of fracture repair, followed by intramedullary pin (24%), wire (11%), external skeletal fixation (10%), screw (9%), amputation (7%), cross pin (6%), IM pin and wire (5%), and rush pin (1%). Among 80 patients, 79%of patients showed a good prognosis after surgery, whereas 13% patients did not experience a good result. This study shows that miniature dogs are prone to falling and fractures, especially in the distal part of long bones.
Yonghun Kim,Young Gon Lee,Ukjin Jung,Jin Ju Kim,Minhyeok Choe,Kyong Taek Lee,Sangwoo Pae,Jongwoo Park,Byoung Hun Lee IEEE 2015 IEEE transactions on electron devices Vol.62 No.4
<P>The effective mobility (μ<SUB>eff</SUB>) of MOSFETs with ultrathin high-k gate dielectric (EOT = 0.85 nm) has been successfully extracted using a time domain reflectometry method. A ground-signal-ground-ground probe configuration is used to analyze the gate-to-channel capacitance (C<SUB>gc</SUB>), gate-to-bulk capacitance (C<SUB>gb</SUB>), and total gate capacitance (C<SUB>g</SUB>) without a complex RF test structure. Using this method, the effective mobility can be extracted even in the presence of a high gate leakage current (~30 A/cm<SUP>2</SUP>) when the conventional split capacitance-voltage method using an impedance analyzer cannot be applied.</P>