A5101755465- Phase-change materials and chalcogenides
- Food Quality and Safety Studies
- Pesticide Residue Analysis and Safety
- Advanced Memory and Neural Computing
- Nutrition, Health and Food Behavior
- Analytical chemistry methods development
- Solid-state spectroscopy and crystallography
- Analytical Chemistry and Chromatography
- Fatty Acid Research and Health
- Photoacoustic and Ultrasonic Imaging
- Biochemical Analysis and Sensing Techniques
- Photochromic and Fluorescence Chemistry
- Advanced Semiconductor Detectors and Materials
- Optical and Acousto-Optic Technologies
- Zeolite Catalysis and Synthesis
- Perovskite Materials and Applications
- GABA and Rice Research
- Analytical Methods in Pharmaceuticals
- Agriculture, Soil, Plant Science
- Food Chemistry and Fat Analysis
- Liquid Crystal Research Advancements
- Luminescence and Fluorescent Materials
- Chemical Synthesis and Characterization
- Photonic and Optical Devices
- Muscle metabolism and nutrition
Kyung Hee University
2012-2021
Seoul Metropolitan Government
2012-2015
Samsung (South Korea)
2004-2007
Novel small contact fabrication technologies were proposed to realize reliable high density 256Mb PRAM(phase change memory) product. Introducing the 2-step CMP (chemical mechanical polishing) process and ring-shaped structure, area distribution was greatly improved even at smallest diameter of 50nm node. The validity this approach directly confirmed by evaluation functionality for fabricated 256Mbit PRAM based on 0.10/spl mu/m CMOS technology.
Phase-change random access memory is considered a potential challenger for conventional memories, such as dynamic and flash due to its numerous advantages. Nevertheless, high reset current the ultimate problem in developing high-density phase-change (PRAM). We focus on adoption of Ge 2 Sb Te 5 confined structures achieve lower currents. By changing from normal GST structure, drops low 0.8 mA. Eventually, our integrated 64 Mb PRAM based 0.18 µm CMOS technology offers large sensing margin: R...
An advanced bottom electrode contact (BEC) was successfully developed for reliable high-density 256 Mb phase-change random access memory (PRAM) using a ring-type scheme. This BEC prepared by depositing very thin TiN films inside hole, after which core dielectrics were uniformly filled into the TiN-deposited hole. Using this novel scheme, it possible to reduce reset current while maintaining low set resistance and uniform cell distribution. Thus, has been clearly demonstrated that use of...
Abstract Photochromic molecule‐incorporated optical devices offer desirable properties for photocontrollable systems, including advanced data storage and super‐resolution imaging. However, these molecules require multiple illumination sources, such as UV visible light, reversible photochemical reactions, which restricts their potential application. This study reports an effective strategy modulating photoisomerization via a single near‐infrared light source assisted by plasmonically enhanced...
본 연구에서는 쌀에 인위적으로 조성된 잔류농약이 세척 및 취반 과정에서 제거되는 정도를 측정하였다. 백미의 농약처리 직후 isoprothiolane과 fthalide의 농도가 각각 <TEX>$7.134{\pm}0.03mg/kg$</TEX> <TEX>$2.024{\pm}0.04mg/kg$</TEX>이었으며 현미에서는 <TEX>$17.941{\pm}1.41mg/kg$</TEX> <TEX>$6.413{\pm}0.19mg/kg$</TEX>이었다. 1회 후 백미와 현미에서 isoprothiolane의 제거율은 23.0% 18.5%이었으며, 14.0% 9.7%이었다. 횟수가 증가함에 따라 각 잔류농약의 제거량은 많아지나 감소하였다. isoprothiolane 과 경우 66.0% 79.0%이었으며 현미의 경우에는 88.7% 92.9%이었다. 농약제거율이 취반과정보다 세척과정에서 더 높았으며, 취반과정에서 높았다. 농약제거를 위한 가장 적합한 방법은 5회 30분간 물에 불리고 새 물로...
It is very important to maintain stable cell uniformity for reliable operation and wide sensing margin since the writing current mainly governed by bottom electrode contact (BEC) size which especially sensitive small process variation. In order accomplish low with uniform distribution, advanced storage module technology using ring type BEC was proposed. Using this, it possible achieve flat BEC, results in a high manufacturability. Finally, we firstly fabricated structure evaluated based on...
ABSTRACT We successfully developed 256Mb Phase Change Random Access Memory (PRAM) based on 0.10μ m-CMOS technologies using ring type contact. The writing current with uniform CD process variation of Bottom Electrode Contact (BEC) was achieved by improving CMP and developing core dielectric material. Also, the contact scheme provided strong reliability such as cycling endurance data retention time for 256 Mb high density PRAM.
HPLC-UVD를 이용하여 diflubenzuron이 다종농약다성분 분석법 제2법에 적합한지를 검증하고자 본 연구를 수행하였다. 유효성을 검증하기 위하여 농약이 검출되지 않은 시금치, 엇갈이배추, 가지, 애호박, 청피망, 오이, 참외 등 7종 농산물을 대상으로 직선성, 특이성, 검출한계, 정량한계, 정확성, 정밀성을 확인하였다. Diflubenzuron 표준용액을 0.05-5 mg/kg 농도로 희석하여 분석한 표준검량선의 직선성은(<TEX>$R^2=0.99999$</TEX>)은 매우 만족할 만한 수준이었다. 검출한계는 0.008 mg/kg, 정량한계는 0.02 이며 회수율은 77.5-105.6%, 상대표준편차는 최대 20% 미만, 정밀도는 intra-day test에서 0.4-1.9%, inter-day 0.7-1.9%를 나타내어 잔류농약분석법에서 허용하는 회수율 기준 70-120% 범위와 상대표준편차 이하의 기준에 적합하였다. LC-MSD를 이용한 재확인 과정을 통해...
서울지역 지하철역사내 자판기에서 판매되는 음료현황 및 설문조사 결과, 자판기 진열음료 중 탄산음료의 비율이 36%으로 가장 높았고, 설문응답자들은 갈증해소를 위해 당류 함량이 많은 탄산음료와 이온음료를 구매하였다. 또한 다빈도 진열음료에 대한 함량 분석결과, 탄산음료 1회 제공량에는 평균 30.4 g, 최고 50.1 g 으로 각설탕(3 g)으로는 10개에서 17개 분량의 당류가 있었다. 이는 세계보건기구의 1일 섭취 권고기준 50 g의 60 % 수준이었고, 일부 탄산음료는 한 캔으로도 권고기준을 모두 섭취하는 제품도 Looking at the current status of beverages sold from vending machines in subway stations Seoul, it was found that carbonated accounted for highest percentage on sale machines, representing 36 all sold....
GC-NPD를 이용하여 pencycuron의 다종농약다성분 분석법을 확립하고자 본 연구를 수행하였다. 제시된 분석법의 검증을 위해 예비 실험을 거쳐 농약이 검출되지 않은 상추, 시금치, 엇갈이배추, 근대, 아욱, 배추를 대상으로 실험하였다. Pencycuron 표준용액을 0.02-2 mg/kg의 농도로 희석하여 분석한 검량선의 직선성(<TEX>$r^2$</TEX> = 0.9999)은 우수하였다. 검출한계는 0.005 mg/kg이고 정량한계는 0.02 mg/kg이며 회수율은 79.6-112.1%, 분석오차는 최대 4.9%미만으로 잔류농약 분석법에서 허용되는 회수율 기준 70-120% 범위와 분석오차 20% 이하의 기준에 적합하였다. 정밀도는 intra-day test에서 1.6-3.0%, inter-day 5.3-11.5%를 나타내어 통해 직선성, 검출한계, 정량한계, 회수율과 정밀도를 검증하고 정확성을 증명하였다. 오랜 시간이 걸려 추출, 정제, 유도체화 과정을 거치는...
The approach to adapt upconversion nanoparticles plasmonic structures has been studied improve their inherent low quantum efficiency. However, the metal-based have limits in extending applications since they are rigid and opaque. In this study, we demonstrate a film composed of an array microbeads, which provides transferability flexibility as well distinctive luminescence enhancement. Our proposed structure comprises silver nanoparticle-decorated silica microbeads on dielectric-metal...