Donghyuk Shin

For the first time, S-RCAT (sphere-shaped-recess-channel-array transistor) technology has been successfully developed in a 2Gb density DRAM with 70nm feature size. It is a modified structure of the RCAT (recess-channel-array transistor) and shows an excellent scalability of recessed-channel structure to sub-50nm feature size. The S-RCAT demonstrated superior characteristics in DIBL, subthreshold swing (SW), body effect, junction leakage current and data retention time, comparing to the RCAT stru

Challenges have arisen in selecting suitable candidates for interconnects and metal contacts due to the exponential increase in metal resistivity at scaled pitches. Molybdenum (Mo) has emerged as a promising alternative to the traditional metals such as copper or tungsten owing to its low electrical resistivity and electron mean free path. In this study, we investigated the formation of a molybdenum film grown by thermal atomic layer deposition (ALD) using a MoO2Cl2 solid precursor and H2 and NH

Titanium dioxide (TiO2) films were deposited by plasma enhanced atomic layer deposition (PE-ALD) system using tetrakis-dimethylamido-titanium (TDMAT) at 250 °C. We applied a new source feeding method, known as Discrete Feeding Method (DFM), to PE-ALD TiO2 process for comparing the deposition rate, the physical and electrical film properties with the films deposited by conventional ALD method. Various analytical studies were carried out to investigate the change of TiO2 thin film characteristics

For the first time, the DRAM device composed of 6F/sup 2/ open-bit-line memory cell with 80nm feature size is developed. Adopting 6F/sup 2/ scheme instead of customary 8F/sup 2/ scheme made it possible to reduce chip size by up to nearly 20%. However, converting the cell scheme to 6F/sup 2/ accompanies some difficulties such as decrease of the cell capacitance, and more compact core layout. To overcome this strict obstacles which are originally stemming from the conversion of cell scheme to 6F/s

ABSTRACT Although ubiquitin is found only in eukaryotes, several pathogenic bacteria and viruses possess proteins that hinder the host ubiquitin system. Legionella , a gram-negative intracellular bacterium, possesses an ovarian tumor (OTU) family of deubiquitinases (Lot DUBs). Herein, we describe the molecular characteristics of Lot DUBs. We elucidated the structure of LotA OTU1 domain and revealed that entire Lot DUBs possess a characteristic extended helical lobe (EHL) that is not found in oth

Silicon dioxide films were deposited using di-isopropylaminosilane and Ar/O2 plasma by the plasma enhanced atomic layer deposition (PE-ALD) system. Film depositions were carried out at a temperature range of 50–200 °C, while the plasma exposure time within the PE-ALD cycle varied from a very short time of 0.3 s to a sufficiently long time of 4.0 s. The growth per cycle, wet etch rate (WER), dielectric constant, and leakage current of as-deposited samples were significantly decreased with increas

배경: 고혈압 진료에 있어서 혈압 관리 및 치료에 관한내용을 담은 개인 휴대전화 문자메시지를 이용하는 것이고혈압 환자의 순응도 및 생활 습관을 포함한 성과지표개선에 영향을 미치는지 알아보고자 연구를 시작하였다. 방법: 연구기간은 2008년 7월부터 2010년 6월까지이며이 기간 동안 동일한 칸데살탄 제제의 항고혈압약물을 처음 처방받은 사람 중 개인 휴대전화 메시지 발송에 동의한 사람 1,453명(남자 607명(47.8%), 여자 846명(58.2%))을 대상으로 하였다. 총 관찰 기간은 12주로 하였고 등록후 문자메시지는 2주에 1회, 총 5회(2, 4, 6, 8, 10주)에 걸쳐 조정센터에서 연구자 맹검을 위해 연구자별로 무작위 배정하여 발송하였다(메시지 발송군: 719명(49.6%): 남자 309명, 여자 410명/대조군: 730명(50.4%): 남 296명, 여 434명). 문자메시지는 항고혈압약물 복용, 운동, 저염식, 절주, 체중감량을 권유하는 내용이었고, 대조군의 경우 1

The spread of SARS-CoV-2 has been the cause of the ongoing COVID-19 global pandemic, which has increased morbidity and mortality worldwide. SARS-CoV-2 has two proteases that play an essential role in its spread, promoting replication by cleaving viral polyproteins. One of these two proteases, PLpro suppresses the host immune response through deubiquitination and deISGylation. Since PLpro plays a vital role in viral spread, there is a need for research on therapeutic agents that target it. In thi

The microstructure, dopant distribution and electrical properties of the ion-implanted surface layer differ significantly depending on the methods of subsequent heat treatments, furnace annealing(FA) and rapid thermal annealing(RTA). The amorphous layer created by ion implantation was recrystallized during the thermal annealing through solid phase epitaxial (SPE) growth. The dopant distribution and electrical properties are discussed with respect to the TEM cross-sectional microstructure observe

Non-von Neumann architectures overcome the memory-compute separation of von Neumann systems by distributing computation and memory locally, thereby reducing data-transfer bottlenecks and power consumption. These features are particularly advantageous for reinforcement learning (RL) workloads that rely on frequent value-function updates across large state-action spaces. When combined with event-driven spiking neural networks (SNNs), non-von Neumann architectures can further improve overall comput

This article compares conceptual metaphors related to COVID-19 as manifested in the written reports of mainstream media in China and the United States. According to the three steps of critical metaphor analysis proposed by Charteris-Black (2004), 12 conceptual metaphors in People’s Daily and 13 conceptual metaphors in The New York Times were identified separately by making use of two self-built corpora. The reasons for employing similar and different conceptual metaphors in the coverage of two m

Three different derivatives were obtained in the synthesis of cobalt-binding BLM-A2 and characterized by NMR and Mass spectrometry. It was found that Component 1 is Co(II)(<TEX>$2H_2O$</TEX>)(BLM-A2), component 2 is Co(III)(<TEX>$OOH^-$</TEX>)(BLM-A2) and component 3 is Co(III)(<TEX>$H_2O$</TEX>)(<TEX>$OH^-$</TEX>)(BLM-A2), respectively. Component 2 and 3 were interestingly dominated when CoBLM-A2 complex was synthesized under basic condition. In this experiment, it was revealed newly that the b