Formation of nickel-based nanocrystal monolayers for nonvolatile memory applications

A simple method for fabricating metal silicide nanocrystal layers with narrow spatial distributions is demonstrated and shown to produce structures suitable for nonvolatile memory applications. The method is based on high-temperature annealing of a sandwich structure comprised of a thin metal (Ni)film sandwiched between two silicon-rich oxide (SiOₓ) layers and has the feature in which the size of the NCs can be controlled by varying the silicon concentrations in the SiOₓ layers or the initial nickelfilm thickness. The typical nanocrystal diameters and densities are 3.6nm and 1.2×10¹²cm⁻², respectively. Capacitance-voltage (C-V) measurements on test structures with these characteristics are shown to have C-V characteristics suitable for nonvolatile memory applications, including a C-V memory window of 11.7V for sweep voltages between −12V and +12.This work was supported by the Korea Research Foundation Grant funded by the Korean Government MOEHRD, KRF-2007-313-C00269 and by the Australian Research Council through its Discovery Grant Program

AN EFFICIENT CELL-BY-CELL ADAPTIVE MESH REFINEMENT ALGORITHM ON STRUCTURED GRIDS

As an efficient AMR method on structured grids, a new cell-by-cell refinement algorithm is developed. Key idea of the new cell-by-cell refinement is to use categorized cell types which are originated from overset mesh technique. Thanks to categorized cell types, present method provides efficient cell-by-cell refinement algorithm, while preserving structured index of grid system. Through numerical test cases, the performance of present algorithm is investigated and comparison of accuracy and efficiency shows that present method is much more accurate and efficient than the case without AMR method.OAIID:oai:osos.snu.ac.kr:snu2011-01/104/0000004648/32SEQ:32PERF_CD:SNU2011-01EVAL_ITEM_CD:104USER_ID:0000004648ADJUST_YN:NEMP_ID:A001138DEPT_CD:446CITE_RATE:0FILENAME:AN_EFFICIENT_CELL-BY-CELL_ADAPTIVE_MESH_REFINEMENT_ALGORITMHM_ON_STRUCTURED_GRIDS.pdfDEPT_NM:기계항공공학부EMAIL:[email protected]:

BIOMECHANICAL TRAITS ANALYSIS WHEN PERFORMING OF JUDO UCHIMATA BY POSTURE AND VOLUNTARY RESISTANCE LEVELS OF UKE

The purpose of this study was to analyze the biomechanical traits variables when performing uchimata (inner thigh reaping throw) by voluntary resistance levels (VRL) and two postures of uke (defender, receiver) in Judo. The postures of uke were shizenhontai (straight natural posture:NP) and jigohontai (straight defensive posture:DP), VRL of uke were 0% and 100%, respectively. The biomechanical variables were temporal (total time-required: TR), postures and COG during performing uchimata. It's important for jUdoists to prepare for individual analysis. prescription and countermeasures because they have experienced several variables when performing techniques according to opponent's postures and VRL in biomechanical aspects

Probe card-Type multizone electrostatic chuck inspection system

Electrostatic chucks (ESCs) are major components of the equipment used to improve the production yield of wafers and temperature uniformity across wafer surfaces by controlling the wafer temperature precisely. However, ESCs are directly exposed to harsh environments, such as plasma, chemical gases, and high temperature fluctuations. Therefore, ESCs may malfunction if used for a certain period. Therefore, repair and performance verification of failed ESCs are required. In this study, we developed a multizone probe card system suitable for electrical testing of the heating electrodes embedded in ESC control modules to correlate the failure mode factors of ESCs. This system has the advantages of examining the resistance of the internal heating electrode of a 144-zone ESC in a short time and detecting an abnormality in this component based on the measured data. The heating electrode resistance measurement error rate of the developed system was 1%, and the maintenance time was reduced by approximately 66% compared with that of existing ESC maintenance methods

Multi-Dimensional Limiting Process for Two- and Three- Dimensional Flow Physics Analysis

In this paper, we derive a limiting condition for three-dimensional compressible flows and present the multi-dimensional limiting process for three-dimensions. The basic idea of the multi-dimensional limiting condition is that the vertex values interpolated at a grid point should be within the maximum and minimum cell-average values of neighboring cells for the monotonic distribution. By applying the MLP (Multi-dimensional Limiting Process), we can achieve monotonic characteristic, which results in the substantial enhancement of solution accuracy and convergence behavior

Multi-dimensional Limiting Strategy for Robust, Accurate and Efficient Computations of Compressible Flows on Unstructured Meshes

The present paper deals with the accurate and robust limiting procedure for the multi-dimensional flow analysis on unstructured meshes. The multi-dimensional limiting process (MLP) which was successfully proposed on structured grid system is extended to unstructured meshes. Based on MUSCL-type framework on unstructured meshes, the new slope limiter is devised to satisfy the MLP condition, which is quite effective to regulate the unwanted oscillations, especially on multiple dimensions. Considering the neighborhood based on the vertex of the cell, as well as the edge, this limiting strategy captures the multi-dimensional flow features very accurately with the proper stencils. From the various numerical results, these desirable characteristics of the proposed limiting strategy are clearly shown.The authors appreciate the financial supports provided by the second stage of the Brain Korea 21 Project for Mechanical and Aerospace Engineering Research at Seoul National University, and by Agency for Defense Development

Structure stability evaluation of offshore heave compensator using multi-body dynamics analysis method

Heave compensator attenuate vessel heave motion during drilling operation of drillship. Heave compensator functions as damping form motion of drillship, such as principle spring of suspension system. The load transfers on the parts of heave compensator. Stress and deformation of all parts is evaluated to diagnose the stability of the compensator. This study makes a decision on the safety of structure. Results of analysis confirm the structure stability of heave compensator for simulation. This result can be used as data for structural analysis to determine safety of a structure

Monotonicity of Multi-dimensional Limiting Process on Unstructured Grids

The present paper deals with the continuous work of extending multi-dimensional limiting process (MLP), which has been quite successfully proposed on two- and three-dimensional structured grids, onto the unstructured grids. The basic idea of the present limiting strategy is to control the distribution of both cell-centered and cell-vertex physical properties to mimic a multi-dimensional nature of flow physics, which can be formulated as so called the MLP condition. This condition satisfies the maximum principle, which ensures monotonicity, and numerical results show that MLP is effective to prevent unwanted oscillations as well as to capture multi-dimensional flow features accurately.OAIID:oai:osos.snu.ac.kr:snu2009-01/104/0000004648/21SEQ:21PERF_CD:SNU2009-01EVAL_ITEM_CD:104USER_ID:0000004648ADJUST_YN:NEMP_ID:A001138DEPT_CD:446CITE_RATE:0FILENAME:Monotonicity_of_Multi-dimensional_Limiting_Process_on_Unstructured_Grids.pdfDEPT_NM:기계항공공학부EMAIL:[email protected]: