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Investigation of InAs/InGaAs/InP Heterojunction Tunneling Field-Effect Transistors
Hye Rim Eun,Sung Yun Woo,Hwan Gi Lee,Young Jun Yoon,Jae Hwa Seo,Jung-Hee Lee,Jungjoon Kim,In Man Kang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.5
Tunneling field-effect transistors (TFETs) are very applicable to low standby-power application by their virtues of low off-current (Ioff) and small subthreshold swing (S). However, low on-current (Ion) of silicon-based TFETs has been pointed out as a drawback. To improve Ion of TFET, a gate-all-around (GAA) TFET based on III-V compound semiconductor with InAs/InGaAs/InP multiple-heterojunction structure is proposed and investigated. Its performances have been evaluated with the gallium (Ga) composition (x) for In1-xGaxAs in the channel region. According to the simulation results for Ion, Ioff, S, and on/off current ratio (Ion/Ioff), the device adopting In0.53Ga0.47As channel showed the optimum direct-current (DC) performance, as a result of controlling the Ga fraction. By introducing an n-type InGaAs thin layer near the source end, improved DC characteristics and radio-frequency (RF) performances were obtained due to boosted band-to-band (BTB) tunneling efficiency.
Gi Ja Lee,Seok Keun Choi,Yun Hye Eo,Sung Wook Kang,Samjin Choi,Jeong Hoon Park,Ji Eun Lim,Kyung Won Hong,Hyun Seok Jin,Berm Seok Oh,Hun Kuk Park 대한생리학회-대한약리학회 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.1
During operations, neurosurgeons usually perform multiple temporary occlusions of parental artery, possibly resulting in the neuronal damage. It is generally thought that neuronal damage by cerebral ischemia is associated with extracellular concentrations of the excitatory amino acids. In this study, we measured the dynamics of extracellular glutamate release in 11 vessel occlusion (VO) model to compare between single occlusion and repeated transient occlusions within short interval. Changes in cerebral blood flow were monitored by laser-Doppler flowmetry simultaneously with cortical glutamate level measured by amperometric biosensor. From real time monitoring of glutamate release in 11 VO model, the change of extracellular glutamate level in repeated transient occlusion group was smaller than that of single occlusion group, and the onset time of glutamate release in the second ischemic episode of repeated occlusion group was delayed compared to the first ischemic episode which was similar to that of single 10 min ischemic episode. These results suggested that repeated transient occlusion induces less glutamate release from neuronal cell than single occlusion, and the delayed onset time of glutamate release is attributed to endogeneous protective mechanism of ischemic tolerance.
AFM Imaging Analysis of Alopecia Areata by Edge Detection
( Gi Ja Lee ),( Hwi Jun Kim ),( Yun Hye Eo ),( Sam Jin Choi ),( Ki Heon Jeong ),( Bark Lynn Lew ),( Woo Young Sim ),( Mu Hyoung Lee ),( Berm Seok Oh ),( Hun Kuk Park ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.1
Alopecia areata(AA) is a common type of autoimmune disorder that produced sudden patch-like hair loss. Owing to the dysfunction of keratogenous zone in affected hair at early anagen, hair shaft with AA had abnormal structure or total disintegration. Typically, it showed characteristic(or unique) broken hair shafts on the hair-less patch. Few techniques were introduced to investigate hair surface. Recently, atomic force microscopy(AFM) became an ideal method for non-invasive examination of hair surface. When the cortical keratinocytes were affected in AA, the topographic changes of hair cuticles could be examined by AFM in nanoscale. In this experiment, we compared the AFM images of hair surface and extracted parameters from the cuticle between control group and patient group with AA(n=12, each). Data demonstrated that the shaft surface of AA patient`s hair was more damaged than that of normal group. Various types of damage such as crack of scale, longitudinal striation, endocuticular ghost and debris were observed on hair cuticles with AA. In order to find cuticle parameters, we performed the edge detection of cuticle with canny mask. The curvature was defined as a secondary differentiation with the x and y coordinates of cuticle edge on AFM images to compare the cuticle edge between two groups. As a result, the cuticle scale parameters showed frequent changes in AA patient groups. In particular, top distance and step height of cuticle in AA group were lower than those of control group and the curvature of cuticle edge in AA patient group was higher than those of healthy one. In conclusion, the cortical keratinocytes might affect the pathogenesis of AA. This is the first comparison study about hair shaft surfaces over the whole lengths between AA and healthy group, to our knowledge.
Discarded Egg Yolk as an Alternate Source of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate)
( Yun-gi Hong ),( Yu-mi Moon ),( Ju-won Hong ),( Tae-rim Choi ),( Hye-rim Jung ),( Soo-yeon Yang ),( Dae-won Jang ),( Ye-rim Park ),( Christopher J. Brigham ),( Jae-seok Kim ),( Yoo-kyung Lee ),( Yung 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.3
Many poultry eggs are discarded worldwide because of infection (i.e., avian flu) or presence of high levels of pesticides. The possibility of adopting egg yolk as a source material to produce polyhydroxyalkanoate (PHA) biopolymer was examined in this study. Cupriavidus necator Re2133/pCB81 was used for the production of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) or poly(3HHx), a polymer that would normally require long-chain fatty acids as carbon feedstocks for the incorporation of 3HHx monomers. The optimal medium contained 5% egg yolk oil and ammonium nitrate as a nitrogen source, with a carbon/nitrogen (C/N) ratio of 20. Time course monitoring using the optimized medium was conducted for 5 days. Biomass production was 13.1 g/l, with 43.7% co-polymer content. Comparison with other studies using plant oils and the current study using egg yolk oil revealed similar polymer yields. Thus, discarded egg yolks could be a potential source of PHA.