• Title/Summary/Keyword: Paper Analysis

Search Result 70,592, Processing Time 0.073 seconds

Systematic Analysis of Periodic Variation in Paper Structure

  • Sung, Yong-Joo;Keller, D.Steven
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.41 no.5
    • /
    • pp.50-58
    • /
    • 2009
  • Periodic variation of local paper structure was evaluated using two-dimensional fast Fourier transform (FFT) and spectral analysis. Since the periodic variation could originate from various sources and have different magnitudes and patterns depending on the origins, a complete analysis of local paper structure properties such as local grammage, local thickness, local apparent density and surface topography was proposed in this study. For a commercial copy paper, the individual periodic patterns for each local structural property were identified by using inverse FFT spectrums of the filtered spectrum. The spectral analysis of newsprint sample provided the period of variation quantitatively, which was useful in comparing the origins of the individual periodic patterns of the local structural properties.

Comparison of pore analysis techniques of the paper (종이의 Pore 특성 측정 기법의 비교)

  • Nam, Ki-Young;Chung, Sun-Ki;Won, Jong-Myoung
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
    • /
    • 2007.11a
    • /
    • pp.179-186
    • /
    • 2007
  • The best way to understand paper properties is to study paper structure. Paper is composed solid materials (pulp and other additives) and air three-dimensionally, it's important to understand pore structure of the paper. There are several method to analysis pore structure of the paper. Mercury intrusion technique is frequently used for the characterization of the porous paper, giving access to parameters such as pore size and pore distribution. But some researchers indicated mercury intrusion distorts the structure due to application of high pressure. So this paper suggest new analysis technique to pore structure of the paper. New pore analysis technique with SEM does not require high pressure, gives good resolution and measures pore structure.

  • PDF

Characterization of the Spatial Variability of Paper Formation Using a Continuous Wavelet Transform

  • Keller, D.Steven;Luner, Philip;Pawlak, Joel J.
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.32 no.5
    • /
    • pp.14-25
    • /
    • 2000
  • In this investigation, a wavelet transform analysis was used to decompose beta-radiographic formation images into spectral and spatial components. Conventional formation analysis may use spectral analysis, based on Fourier transformation or variance vs. zone size, to describe the grammage distribution of features such as flocs, streaks and mean fiber orientation. However, these methods have limited utility for the analysis of statistically stationary data sets where variance is not uniform with position, e.g. paper machine CD profiles (especially those that contain streaks). A continuous wavelet transform was used to analyze formation data arrays obtained from radiographic imaging of handsheets and cross machine paper samples. The response of the analytical method to grammage, floc size distribution, mean fiber orientation an sensitivity to feature localization were assessed. From wavelet analysis, the change in scale of grammage variation as a function of position was used to demonstrate regular and isolated differences in the formed structure.

  • PDF

Design and Implementation of Paper Map for Traditional Korean Medicine (한의학 연구동향 분석을 위한 페이퍼 맵 분석 시스템의 설계 및 구현)

  • Yea, Sang-Jun;Jang, Hyun-Chul;Kim, Chul;Kim, Jin-Hyun;Kim, Sang-Kyun;Song, Mi-Young
    • The Journal of Korean Medicine
    • /
    • v.31 no.5
    • /
    • pp.103-111
    • /
    • 2010
  • Objectives: Because of the characteristics of traditional Korean medicine, there are few overseas patents and SCI papers. Researchers are struggling to analyze the research trend using existing patent analysis system and paper analysis system. We aim to build up a web-based paper map analysis system for Traditional Korean Medicine to improve the situation. Methods: We studied the following three sub topics. First, we surveyed the research trend analysis method for traditional Korean medicine. Second, we designed a paper map analysis model and made the algorithm for it. Finally, the development of the paper map analysis system was conducted. Results: We developed a web-based paper map analysis system which has the three main functions being analysis chart, topology map and contour map. For the rich internet application, we used the flex development tool and java integrated development environment. Conclusion: We will provide our paper map analysis system in the OASIS through the minor changes to provide easy use. We hope that this system will be a useful tool to analyze the research trends for traditional Korean medicine.

Root Cause Analysis on Delamination Failure between Coating Film and Paper (코팅지 박리파손에 대한 근본원인분석)

  • Lee, D.B.
    • Journal of Power System Engineering
    • /
    • v.9 no.1
    • /
    • pp.57-63
    • /
    • 2005
  • In the calendar and the advertising catalog, the surface is usually coated by coating polypropylene film. The delamination failure of coating film depends on surface roughness and quality of the substrate paper. In this paper, the mechanisms of delamination failure between the coating film and the paper is investigated by using the root cause analysis as one of techniques of reliability evaluation. The papers used in failure analysis are three kind products made by two domestic and one foreign companies. It found that the main causes of delamination failure between the coating film and the paper were the creation of microvoids caused by shape of filler and their growth caused by contraction of paper.

  • PDF

Classification of papers using IR and NIR spectra and principal component analysis (IR 및 NIR 스펙트럼과 주성분 분석을 통한 지종의 분류)

  • Kim, Kang-Jae;Eom, Tae-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.48 no.1
    • /
    • pp.34-42
    • /
    • 2016
  • In this study, we classified three copying papers and Korean, Chinese, and Japanese traditional papers using IR and/or NIR spectra and principal component analysis. Various chemicals are used when producing fine papers. In this case, the IR method to analyze functional groups is suitable for the classification of paper. On the other hand, NIR analysis is more suitable for the classification of traditional papers, as it uses nearly raw materials (pulp). Therefore, principal component analysis using IR and NIR depending on the paper production process will be the classification tool of paper.

Comparison of Characterization Techniques of the Pore in Paper Sheet (종이의 기공 특성 측정 기법의 비교)

  • Won, Jong-Myoung;Nam, Ki-Young;Chung, Soon-Ki
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.39 no.4
    • /
    • pp.1-6
    • /
    • 2007
  • Paper is a composite consisted of various solid materials including pulp, filler and other additives. The pore is also one of components consisting the paper structure. Thus the characterization of pore structure of paper is very helpful in the understanding the structural properties of paper. Mercury intrusion technique is frequently used for the characterization of the porous paper, giving access to parameters such as pore size and pore distribution. But some researchers pointed out the problem that the distortion of the pore structure can be occurred by the application of high pressure during mercury intrusion. Thus in this study, we tried to evaluate the potential of SEM and image analysis method as means for analyzing pore structure of the paper. The new pore analysis technique with SEM and image analysis does not require the application of high pressure, and gave better relation between the measured pore characteristics and the bulk of sheet than mercury intrusion method.

Secure Information Flow Analysis in Mini x86 Assembly Language (Mini x86 어셈블리어에서 보안 정보 흐름 분석)

  • Kim, Je Min;Kim, Ki Tae;Yoo, Weon Hee
    • Journal of Korea Society of Digital Industry and Information Management
    • /
    • v.5 no.3
    • /
    • pp.87-98
    • /
    • 2009
  • This paper discuss secure information flow analysis and its visualization. Information leak is defined as existence of information flow from variables which have user's private informations to variables that anyone can access. Secure information flow analysis has been made to decide of whether the information leak is or not. There are many researches for secure information flow analysis concerning high level programming languages. But actually, programs that user executes don't have program source code represented in high level programming language. Thus there is need for analysis of program represented in low level language. More to analysis, visualization of analysis is very important. So, this paper discuss visualization of secure information flow analysis. In this paper, Mini x86 Assembly Language which is subset of x86 assembly language is defined and secure information flow analysis of program is proposed. In addition, this paper defines transfer function that is used for analysis and shows how to visualize control flow graph.

The Thermal Aging Characteristics of Cellulose Paper using Analysis for CO, $CO_2$ Gas and Furan Compounds (CO, $CO_2$ 가스와 Furan 함유량의 분석을 통한 셀룰로오스 절연지의 열 열화특성)

  • Kim, Jae-Hoon;Han, Sang-Ok
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.58 no.4
    • /
    • pp.499-504
    • /
    • 2009
  • The analysis for furan compound has provided a complementary technique to dissolved gas analysis(DGA) for monitoring transformers when total concentration of CO and $CO_2$ dissolved in oil only has been evaluated the aging of insulating paper. But, the analysis of furanic compounds by high performance liquid chromatography(HPLC) has been important more than DGA recently. Because it has been known that furanic components in transformer oil have come only from the decomposition of insulating paper. Therefore we have manufactured accelerating aging cell which was aged during 60 hours at 100, 150, 180 and $200^{\circ}C$, respectively, for investigating the characteristics of cellulose paper by thermal using analysis for CO, $CO_2$ and furan compound.

Analysis for Insulating Degradation Characteristics with Aging Time for Oil-filled Transformers and/or Correlation between using Linear Regression Method (유입식 변압기의 열화시간에 따른 절연 열화특성 및 선형회귀법을 이용한 상관관계 분석)

  • Lee, Seung-Min
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.4
    • /
    • pp.693-699
    • /
    • 2010
  • General transformer's life is known as paper insulation' life. If a transformer is degraded by these aging factors, it is known that electrical, mechanical and chemical characteristics for transformer's oil-paper are changed. When the kraft paper is aged, the cellulose polymer chains break down into shorter lengths. It causes decrease in both tensile strength and degree of polymerization of paper insulation. The paper breakdown is accompanied by an increase in the content of furanic compounds within the dielectric liquid. In this paper it is aimed at analysis on correlation between aging characteristics for insulating diagnosis of thermally aged paper. For investigating the accelerated aging process of oil-paper samples accelerating aging cell was manufactured for estimating variation of paper insulation during 500 hours at $140^{\circ}C$ temperature. To derive the results, it was performed analysis such as tensile strength(TS), depolymerization(DP), dielectric strength(DS), relative permittivity, water content(WC) and furan compound(FC) for aged paper. Also for analyzing correlation between insulating degradation characteristics, we used linear regression method. As as results of linear regression analysis, there was a close correlation between TS and DP. WC, FC. But dielectric strength was a weak correlation with aging time.