Ji‐Hyeon Park

Abstract Si-doped gallium oxide (Ga 2 O 3 ) thin films were grown on a c-plane sapphire substrate by metalorganic chemical vapor deposition (MOCVD) and fabricated into metal oxide semiconductor field effect transistors (MOSFETs). The Ga 2 O 3 MOSFETs exhibited effective gate modulation of the drain current with a complete channel pinch-off for V G < −25 V, and the three-terminal off-state breakdown voltage was 390 V. The device shows a very low gate leakage current (∼50 pA mm −1 ), which led

<i>Faecalibacterium prausnitzii</i>, a major commensal bacterium in the human gut, is well known for its anti-inflammatory effects, which improve host intestinal health. Although several studies have reported that inulin, a well-known prebiotic, increases the abundance of <i>F. prausnitzii</i> in the intestine, the mechanism underlying this effect remains unclear. In this study, we applied liquid chromatography tandem mass spectrometry (LC-MS/MS)-based multiomics approaches to identify biologica

This article explored a variety of factors that directly and indirectly influenced musical self-efficacy of elementary students. Factors related to musical self-efficacy included previous musical experience, perceived teacher expectancy, parental support in music, home and school musical environment. This study was to investigate the relations among factors by using the path analysis. The summary of the results are as follows: Musical experience, teacher expectancy, and home environment were th

This article demonstrates for the first time to the best of our knowledge, the merits of InGaN/GaN multiple quantum wells (MQWs) grown on hollow n-GaN nanowires (NWs) as a plausible alternative for stable photoelectrochemical water splitting and efficient hydrogen generation. These hollow nanowires are achieved by a growth method rather not by conventional etching process. Therefore this approach becomes simplistic yet most effective. We believe relatively low Ga flux during the selective area g

III-Nitride nanowires are currently considered as next generation photovoltaic materials due to their excellent physical properties together with reduced dislocation densities, increased surface area and thus enhanced light absorption and direct path for carrier transport. Here, we investigate the photovoltaic characteristics of a solar cell fabricated from a novel hybrid nanostructure comprising uniaxial and coaxial InGaN/GaN multi-quantum wells (MQWs) along with an InGaN nano-cap layer. Variou

Orthorhombic κ-Ga2O3, as one of the Ga2O3 polymorphs, is considered a promising as ultrawide bandgap material for extreme environment devices. It is considered more superior than the conventional group III-V compound semiconductors and silicon carbides in extreme environments demanding material/device characteristics of high-voltage, high-temperature, high-pressure, high-impact, and high-radiation. In this study, we demonstrate ultrasensitive ultraviolet-C (UV-C) detection using Si-doped orthorh

A fin field-effect transistor (FinFET) based on single β-Ga2O3 nanowire with a diameter of ∼60 nm transferred to Si substrate is demonstrated. The FinFET device shows good saturation performance within a drain-to-source voltage up to 5 V and exhibits a high on/off ratio of ∼4 × 108, a system-limit low leakage current (∼4 fA), and a relatively low subthreshold swing (∼110 mV). Simulation shows that the channel of the FinFET depletes much faster than that of the back-gate FET with negative gate bi

Arrest defective 1 (ARD1) is an acetyltransferase that is highly conserved across organisms, from yeasts to humans. The high homology and widespread expression of ARD1 across multiple species and tissues signify that it serves a fundamental role in cells. Human ARD1 (hARD1) has been suggested to be involved in diverse biological processes, and its role in cell proliferation and cancer development has been recently drawing attention. However, the subcellular localization of ARD1 and its relevance

In Korea, many paddy fields in mountainous area have been abandoned because of their low accessibility and rice price and the abandoned paddy terraces have changed into natural lentic wetlands. To understand the relationship between characteristics of environmental conditions and early development of plant community in abandoned paddy terraces,we investigated at four well-maintained abandoned paddy terraces in 3 different climatic zones in Korea. Soil texture of abandoned paddy terraces was most

We demonstrate the fabrication of n-GaN:Si/p-GaN:Mg nanowire arrays on (111) silicon substrate by metal organic chemical vapor deposition (MOCVD) method .The nanowires were grown by a newly developed two-step growth process. The diameter of as-grown nanowires ranges from 300-400 nm with a density of 6-7 × 10(7) cm(-2). The p- and n-type doping of the nanowires is achieved with Mg and Si dopant species. Structural characterization by X-ray diffraction (XRD) and high-resolution transmission electr

Field-emission nanodiodes with air-gap channels based on single β-Ga2O3 nanowires have been investigated in this work. With a gap of ∼50 nm and an asymmetric device structure, the proposed nanodiode achieves good diode characteristics through field emission in air at room temperature. Measurement results show that the nanodiode exhibits an ultrahigh emission current density, a high enhancement factor of >2300, and a low turn-on voltage of 0.46 V. More impressively, the emission current almost ke

람사르 습지로 지정된 오대산 습지 중 하나인 질뫼늪 보호구역에서 2007년부터 2011년까지 생태적 특성을 파악하였다. 조사 결과, 유출수는 연평균 0.80 m3/min이었다. 질뫼늪 보호구역 수질 중 pH는 평균 6.1, EC는 19 μS/cm, 칼륨, 칼슘, 암모늄 등의 양이온과 질산, 그리고 유효 인산 분석 결과 모두 평균 2.0 mg/L 이하였다. 퇴적층은 다른 산지 습지인 용늪이나 왕등재늪에 비하여 덜 발달되었다. 식물상으로는 49과 118속 163종 3아종, 29변종, 6품종으로 163종류가 조사되었으며, 물이끼가 우점하는 장소와 사초기둥에 환경부 지정 멸종위기 Ⅱ급인 기생꽃이 서식하고 있었다. 식생 조사 결과 질뫼늪 보호구역에 서식하는 식물종은 시기에 따라 분포의 확장과 감소를 반복하면서 우점도의 변화가 나타났다. 질뫼늪은 물이끼를 기반으로 한 이탄습지로서 식물종 다양성 등 그 보존 가치가 뛰어난 것으로 판단되나 보호지역 주변에 위치한 목장 등 잠재적 위험 요소들이 존재