4,167 research outputs found
Coordinated control of a macro/micro robot
No full text학위논문(석사) - 한국과학기술원 : 기계공학과, 1999.2, [ vii, 77 p. ]한국과학기술원 : 기계공학과
Escherichia coli is engineered to grow on CO2 and formic acid
No full textWe engineered Escherichia coli to grow on CO and formic acid alone by introducing the synthetic CO and formic acid assimilation pathway, expressing two formate dehydrogenase genes, fine-tuning metabolic fluxes and optimizing the levels of cytochrome bo and bd-I ubiquinol oxidase. Our engineered strain can grow to an optical density at 600 nm of 7.38 in 450 h, and shows promise as a platform strain growing on CO and formic acid alone
Gate Dielectric Using Graphene FETs
No full textA novel method to analyze the ferroelectric switching behaviors of Hf0.5Zr0.5O2 (HZO) gate dielectric is developed using the unique charge response characteristics of graphene field effect transistor (GFET). The linear density of state of graphene in a low V-g region enables a detailed transient analysis of the effects of transient charging and dipole switching. The trans-conductance of GFET with ferroelectric HZO is observed to be increased by 610% in DC measurement with a minimal hysteresis as reported for negative capacitance FET. However, fast pulse I-V analysis reveals that the improved swing and small hysteresis of GFET with ferroelectric HZO are the result of compensation between the bulk charge trapping and dipole charges.11Nsciescopu
Valorizing carbon dioxide by metabolically engineered microorganism for the sustainable production of biomass
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TEOS-coated SERS Mask Patch for Lung Cancer Biomarker Detection in Exhaled Breath Aerosol
No full textHighly responsive near-infrared photodetector with low dark current using graphene/germanium Schottky junction with Al2O3 interfacial layer
No full textThe performance of a graphene/Ge Schottky junction near-infrared photodetector is significantly enhanced by inserting a thin Al2O3 interfacial layer between graphene and Ge. Dark current is reduced by two orders of magnitudes, and the specific detectivity is improved to 1.9 x 10(10) cm . Hz(1/2)W(-1). The responsivity is improved to 1.2 AW(-1) with an interfacial layer from 0.5 AW(-1) of the reference devices. The normalized photo-todark current ratio is improved to 4.3 x 10(7) W-1 at a wavelength of 1550 nm, which is 10-100 times higher than those of other Ge photodetectors.11Ysciescopu
Multispectral imaging based on a Smartphone with an external C-MOS camera for detection of seborrheic dermatitis on the scalp
No full textTo date, the incident rates of various skin diseases have increased due to hereditary and environmental factors including stress, irregular diet, pollution, etc. Among these skin diseases, seborrheic dermatitis and psoriasis are a chronic/relapsing dermatitis involving infection and temporary alopecia. However, they typically exhibit similar symptoms, thus resulting in difficulty in discrimination between them. To prevent their associated complications and appropriate treatments for them, it is crucial to discriminate between seborrheic dermatitis and psoriasis with high specificity and sensitivity and further continuously/quantitatively to monitor the skin lesions during their treatment at other locations besides a hospital. Thus, we here demonstrate a mobile multispectral imaging system connected to a smartphone for selfdiagnosis of seborrheic dermatitis and further discrimination between seborrheic dermatitis and psoriasis on the scalp, which is the more challenging case. Using the system developed, multispectral imaging and analysis of seborrheic dermatitis and psoriasis on the scalp was carried out. It was here found that the spectral signatures of seborrheic dermatitis and psoriasis were discernable and thus seborrheic dermatitis on the scalp could be distinguished from psoriasis by using the system. In particular, the smartphone-based multispectral imaging and analysis moreover offered better discrimination between seborrheic dermatitis and psoriasis than the RGB imaging and analysis. These results suggested that the multispectral imaging system based on a smartphone has the potential for self-diagnosis of seborrheic dermatitis with high portability and specificity
Photoplethysmography Monitoring with Optical Low Angel Pass Filter Using Slanted Mirror Array
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