• Title, Summary, Keyword: Analytical method

Search Result 6,905, Processing Time 0.063 seconds

A study on the development of analytical method for zinc pyrithione in cosmetics (화장품 중 zinc pyrithione 분석방법 개발에 대한 연구)

  • Jung, Jung-sul;Bae, Kyeong-mi;Son, Seung-hwan;Park, Jung-woo;Kim, Ji-hyun;Hong, Sung-taeg;Sun, Yle-shik
    • Analytical Science and Technology
    • /
    • v.28 no.3
    • /
    • pp.160-167
    • /
    • 2015
  • This study aims to develop a new analytical method to detect zinc pyrithione, the ingredient of cosmetics appointed as restricted ingredients and used as preservatives.. The analytical method was based on data gathered from the relevant literature. Information about the amounts of these ingredients was researched in order to select the base-matrix materials used to validate the analytical method. After selecting and preparing the base-matrix materials, the analytical method was validated by method validation procedures. The analytical method was verified first by inter-laboratory validation and then through analyzing the cosmetics sold in the market. Based on the results of this study, guidelines are proposed for the analysis of restricted ingredients in cosmetics, which will provide a method to test the cosmetics circulating in the Korean market. The use of the proposed guidelines will increase the quality of the cosmetics as well as the safety of human health, which will enhance the competitiveness of the Korean cosmetics industry and lead to an increase in the exportation of cosmetics.

Differential analysis of amikacin and butirosin

  • Nam, Doo-Hyun;Ryu, D.Y.
    • Archives of Pharmacal Research
    • /
    • v.5 no.2
    • /
    • pp.87-91
    • /
    • 1982
  • In order to develop an analytical method for amikacin and butirosin in presence of their parent antibiotics, kanamycin A and ribostamycin, high-performance liquid chromatographic technique and microbioassay method were evaluated and compared. Using high performance liquid chromatography, two acylated antibiotics, amikacin and butirosin was partially separated from their parent antibiotics, to provide a qualitative analytical method. In microbioassay using Pseudomonas aeruginosa TI-13, a producer of aminoglycoside-3-phosphotransferase I, only acylated antibiotics were selectively analyzed when paper disc-susceptibility assay was used. The standard curve showed a good correlation between the response and odse in semilogarithmic plat with correlation coefficients above 0.96, and analytical deviation from expected dose was within 10%.

  • PDF

Eddy Current Analysis of Linear Switched Reluctance Motor using Analytical Method (해석적 방법을 이용한 직선형 스위치드 릴럭턴스 전동기의 2차측 와전류 해석)

  • Jang, Seok-Myeon;Park, Ji-Hoon;Han, Cheol;You, Dae-Joon;Seo, Jin-Ho;Lee, Kyoung-Bok
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1077-1078
    • /
    • 2011
  • This paper deals with eddy current analysis of linear switched reluctance motor using analytical method. First, flux density is calculated using analytical method. From flux density, eddy current is analyzed according to moving speed. Finally, analyzed result is compared with finite element method.

  • PDF

The Study of detailng for concrete reinforcement and Seismic Analysis Method for Underground Reinforced Concrete Box Structures (지하 철근 콘크리트 박스 구조물의 내진해석방법 및 철근 배근 상세에 관한 연구)

  • Lee, Myoung-Soo;Han, Sang-Chel
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.1215-1222
    • /
    • 2005
  • The object of this thesis is an study on detailing for concrete reinforcement and analytical study for seismic behavior of underground reinforced concrete box structures using the established seismic analytical method. Using the established seismic analytical method that has been presented in various documents seismic behavior of buried reinforce concrete box structures is compared. From the comparsion, it is shown that feasibility and detailing detailng for concrete reinforcement and seismic method for seismic analysis of buried reinforced concrete box structures.

  • PDF

The calculation of inductance profile for linear switched reluctance motor by analytical method (해석적 방법에 의한 리니어 스위치드 릴럭턴스 전동기의 인덕턴스 프로파일 산정)

  • Jang, Seok-Myeong;Park, Ji-Hoon;Choi, Jang-Young;Sung, Ho-Kyung
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.138-140
    • /
    • 2005
  • This paper deals with inductance profile of linear switched reluctance motor. Inductance profile of LSRM calculate at align and unalign position using analytical method. Analytical method of this paper used space harmonics method, Also, analysis result compares with data that is derived through an experiment, and proved validity.

  • PDF

Review on Analytical Solutions for Slump Flow of Cement Paste (시멘트 페이스트의 슬럼프 유동 모사를 위한 분석적 해의 검토)

  • Yun, Taeyoung
    • International Journal of Highway Engineering
    • /
    • v.18 no.3
    • /
    • pp.21-32
    • /
    • 2016
  • PURPOSES : In this paper, the analytical solutions suggested to simulate the behavior of rheological fluids were rigorously re-derived and investigated for fixed conditions to evaluate the applicability for the solutions on a mini-cone slump test of cement paste. The selected solutions with proper boundary conditions can be used as reference solutions to evaluate the performance of numerical simulation approaches, such as the discrete element method. METHODS : The slump, height, and spread radius for the given boundary and yield stress conditions that are determined by five different analytical solutions are compared. RESULTS : The analytical solution based on fluid mechanics for pure shear flow shows similar results to that for intermediate flow at low yield stresses. The fluid mechanics-based analytical solution resulted in a very similar trend to the geometry-based analytical solution. However, it showed a higher slump at high yield stress and lower slump at low yield stress ranges than the geometry-based analytical model. The analytical solution based on the mini-cone geometry was not significantly affected by the yield criteria, such as von Mises and Tresca. CONCLUSIONS : Even though differences among the analytical solutions in terms of slump and spread radius existed, the difference can be considered insignificant when the solutions were used as reference to evaluate the appropriateness of numerical approaches, such as the discrete element method.

Standardization of Hippocastani Semen Extract (서양칠엽수종자엑스 기준및시험법 비교 및 규격 설정)

  • Kim, Seung-Hyun;Kim, Dae-Hyun;Park, Jin-Ho;Cho, Chang-Hee;Lee, Jong-Pill;Kang, Shin-Jung;Lee, Mi-Na;Sung, Sang-Hyun
    • Journal of Pharmaceutical Investigation
    • /
    • v.40 no.1
    • /
    • pp.59-61
    • /
    • 2010
  • This study was carried out to establish standard analytical method of Hippocastani Semen extract. Each standard analytical methods were covered for exact and efficient analytical method. Consequently, analytical method of Deutsches Arzneibuch has been adopted for Hippocastani Semen extract. Analytical methods established in this study could be applied to a reasonable and unified quality control of Hippocastani Semen extract.

Analytical study of the failure mode and pullout capacity of suction anchors in clay

  • Liu, Haixiao;Wang, Chen;Zhao, Yanbing
    • Ocean Systems Engineering
    • /
    • v.3 no.2
    • /
    • pp.79-95
    • /
    • 2013
  • Suction anchors are widely adopted in mooring systems. However there are still challenges in predicting the failure mode and ultimate pullout capacity of the anchor. Previously published methods for predicting the inclined pullout capacity of suction anchors are mainly based on experimental data or the FEM analysis. In the present work, an analytical method that is capable of predicting the failure mode and ultimate pullout capacity of the suction anchor in clay under inclined loading is developed. This method is based on a rational mechanical model for suction anchors and the knowledge of the mechanism that the anchor fails in seabed soils. In order to examine the analytical model, the failure angle and pullout capacity of suction anchors from FEM simulation, numerical solution and laboratory tests in uniform and linear cohesive soils are employed to compare with the theoretical predictions and the agreement is satisfactory. An analytical method that can evaluate the optimal position of the attachment point is also proposed in the present study. The present work proves that the failure mode and pullout capacity of suction anchors can be reasonably determined by the developed analytical method.

Determination of Total Volatile Bases of Tobacco Using Near Infrared Spectroscopy (근외적 분광분석법을 이용한 담배 중 전휘발성염기 분석)

  • Kim Yong-Ok;Jang Gi-Chul;Lee Chul-Hee;Chung Han-Joo
    • Journal of the Korean Society of Tobacco Science
    • /
    • v.27 no.2
    • /
    • pp.207-211
    • /
    • 2005
  • This study was carried out to develop calibration equation of total volatile bases of tobacco leaf using near infrared spectroscopy(NIRS). Burley, imported flue-cured and oriental leaf tobacco samples were collected in 2005 crop year. Calibration equation was developed by modified partial least square method. The standard error of calibration and $R^2$ between traditional analytical method and NIRS analytical method were $0.038\%$, 0.983 for burley and $0.027\%$, 0.986 for imported flue-cured and oriental leaf, respectively. The standard error of performance and $R^2$ between traditional analytical method and NIRS analytical method were $0.048\%$, 0.940 for burley and $0.024\%$, 0.986 for imported flue-cured and oriental leaf, respectively. From these results, the NIRS analytical method seems to be applicable in analyzing total volatile bases of tobacco.

Introduction of Analytical Method to Britain and British Mathematical Development in Nineteenth Century (19세기 초 영국의 해석적 방식의 도입과 이후 영국 수학의 발전 : 19세기 초 케임브리지 대학의 '해석학회'의 의의와 그 한계)

  • Cho, Su-Nam
    • Journal for History of Mathematics
    • /
    • v.20 no.1
    • /
    • pp.17-32
    • /
    • 2007
  • In this paper, I review the origins, activities, and influences on the future mathematical development of the Analytical Society of Cambridge. The story of the late 18th century Scotland mathematicians and the early 19th century Cambridge mathematician such as Woodhouse, and the Analytical Society's history show that the Analytical Society wasn't a completely new and reformative meeting. This article reveals that the new analytical studies developed characteristically in Britain's specific intellectual and social context of the late 18th century and the early 19th century.

  • PDF