• Title/Summary/Keyword: 코시

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A Trimmed Spatial Median Estimator Using Bootstrap Method (붓스트랩을 활용한 최적 절사공간중위수 추정량)

  • Lee, Dong-Hee;Jung, Byoung-Cheol
    • The Korean Journal of Applied Statistics
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    • v.23 no.2
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    • pp.375-382
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    • 2010
  • In this study, we propose a robust estimator of the multivariate location parameter by means of the spatial median based on data trimming which extending trimmed mean in the univariate setup. The trimming quantity of this estimator is determined by the bootstrap method, and its covariance matrix is estimated by using the double bootstrap method. This extends the work of Jhun et al. (1993) to the multivariate case. Monte Carlo study shows that the proposed trimmed spatial median estimator yields better efficiency than a spatial median, while its covariance matrix based on double bootstrap overcomes the under-estimating problem occurred on single bootstrap method.

Effect of Artificially Cultured Phellinus linteus on Harmful Intestinal Bacterial Enzymes and Rat Intestinal ${\alpha}-glucosidases$ (재배상황버섯의 장내 세균 유해효소 및 알파글루코시다제 저해효과)

  • 김동현;최혁재;배은아;한명주;박순영
    • Journal of Food Hygiene and Safety
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    • v.13 no.1
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    • pp.20-23
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    • 1998
  • The objective of this study was to evaluate the bifidogenic effect and a-glucosidase inhibitory effect of artificially cultured Phellinus linteus. The water extract of P. linteus promoted the growth of Bifidobacterium breve as well as the decrease of final pH in the media culturing intestinal bacteria. The growth of lactic acid bacteria inhibited effectively the bacterial enzymes, ${\beta}-glucosidase,\;{\beta}-glucuronidase$ and tryptophanase, of intestinal bactetria. The water extract of P. linteus inhibited maltase, sucrase and ${\alpha}-amylase$ of rat intestine.

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A Study on Alkyl Glucoside Synthesis by Amphiphilic Phase Enzyme Reaction (양친매상 효소반응에 의한 알킬글루코시드의 합성연구)

  • 허주형;임교빈김해성
    • KSBB Journal
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    • v.11 no.5
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    • pp.511-517
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    • 1996
  • An amphiphilic phase enzyme reaction was used to synthesize alkyl glucosides from glucose and alkyl alcohol with immobilized ${\beta}$-glucosidase using four glycol ether cosolvents(monoglyme, diglyme, 2-methoxyethanol, and 1,4-dioxane). Monoglyme was shown to be the best cosolvent for the amphiphilic phase medium composed of water/cosolvent/alkyl alcohol admixture. To obtain high yield of alkyl glucoside by amphiphilic phase enzyme reaction, hydrophilicity-hydrophobicity of amphiphilic media and enzyme microenvironment was optimized from the viewpoints of substrate solubility, enzyme activity, water activity, and dynamic equilibrium between glucose alcoholysis and glucoside hydrolysis. Under optimum reaction conditions, the highest concentrations of hexyl, octyl, decyl, and dodecyl glucosides were 18.2, 9.68, 7.27, and 6.03g/L, respectively.

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The Production, Distribution, and Utilization of Rice in Japan (일본의 쌀 생산, 유통 및 이용현황)

  • Inouchi, Naoyoshi
    • Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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    • 2002.08a
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    • pp.32-45
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    • 2002
  • 일본은 기후적으로도 쌀의 생산에 적합하며 쌀은 일본의 주곡이다. 1893년 국립농업연구소가 설치된 이래로 쌀은 품질과 단보당 생산량이 꾸준히 개선되어와 6/1의 노동시간으로 생산량은 2.5배의 증가를 가져왔다. 이러한 진전은 재배방법의 개선, 비료, 농약, 재배기술, 기계화, 관개배수, 농지개량 등의 요인들로 볼 수 있다. 현재 일본에서 생산되고 있는 주요 쌀 품종으로는 코시히카리(35.5%), 히토메보레(9.7%), 히노히카리(9.0%), 아키다코마치(8.5%), 키라라(4.8%) 등 10여 품종이며 최근에는 형질전환 품종의 연구와 함께 생물공학적 연구, 생리, 품질, 곤충과 잡초, 토양, 식품가공 등 기본적인 연구에 심혈을 기울이고 있다. 새로운 형태의 쌀 품종으로는 냉동조리쌀밥, 초밥, 레토르트룡 쌀 등 가공용으로 적합하도록 하기 위하여 아밀로오즈의 함량을 5-15%로 낮춘 쌀이나 카레, 필라프, 튀김 쌀 등의 용도에 적합하도록 아밀로오스의 함량을 30%이상으로 높인 쌀 뿐만 아니라 곡립의 크기와 길이 등을 변형시킨 쌀, 유색미, 향미, 단백질 함량 조절 쌀, 거대 배아미, lipoxigenase 활성을 없앤 쌀, 단맛나는 쌀 등이 연구, 생산되고 있다. 일본에서의 쌀이용은 먼저 가공용 쌀을 들 수 있다. 밥, 청주, 스낵, 쌀가루, 미소발효 등 다양하게 이용이 되고 있으며 parboiled rice와 이의 색과 향을 개선한 converted rice, 현미를 이용한 가공쌀, 쌀빵, 현미가루, 세척미, 쌀국수, 쌀스낵, 당과, 죽, ?은 채소아 함께하는 타키코미고한, 초밥, 냉동쌀밥, 무균포장밥, 건조밥, 즉석밥 등 매우 다양하다.

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Light-weight System Design & Implementation for Wireless Intrusion Detection System (무선랜 침입탐지를 위한 경량 시스템 설계 및 구현)

  • Kim, Han-Kil;Kim, Su-Jin;Lee, Hwan-Kyu;Jung, Hoe-Kyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.3
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    • pp.602-608
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    • 2014
  • Smartphones have become commonplace to use smart, BYOD (Bring Your Own Device) spread the trend of domestic WLAN use is intensifying as a result, the security threat will be greatly increased. Even though WLAN vendors such as Cisco Systems Inc,. Aruba networks released WIPS, MDM, DLP etc, however, these solutions can not be easily introduced for small business due to high cost or administrative reasons. In this paper, without the introduction of expensive H/W equipment, in WLAN environments, packet analysis, AP, Station management, security vulnerabilities can be analyzed by the proposed intrusion detection system.

A Study on Contact Deformation of Automotive Door Weatherstrip Using Non-linear Finite Element Method (비선형 유한요소법을 이용한 자동차 도어 웨더스트립의 접촉변형에 관한 연구)

  • Kim Byung Soo;Moon Byung-Young;Kim Kwang-Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.1-7
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    • 2005
  • In vehicle door system, weatherstrip seals protect passengers form noise, dust, rain and wind out of the vehicle. The higher efficient a weatherstrip is, the more durable it is in contact between the door and body frame. In this study, nonlinear finite element(FE) analysis is performed to obtain cauchy-stresses, displacements and reaction forces of the weatherstrip. Mechanical properties of the weatherstrip is obtained by uniaxial tension test. The MARC which is a commercial software for the nonlinear analysis of a flexible FE model is used. Twenty-one cases of the FE model are developed by using Ogden-foam formulation. In the results of nonlinear FE analysis, the most valuable deformation of the weatherstrip occurred when displacement control value reaches 7.2mm. Severe deformation is observed as the displacement control value become more increased. When the weatherstrip is designed, it would be considered that the displacement value of the weatherstrip has to be less than 7.2mm.

A Study on the Performances of Korean WWW Search Tools (국내 웹 검색도구의 특성 및 탐색 기능 평가에 관한 연구)

  • Lee Lan-Ju;Choi Kyung-Hwa
    • Journal of the Korean Society for Library and Information Science
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    • v.31 no.3
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    • pp.75-108
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    • 1997
  • The purpose of the article is to help users to select appropriate Korean WWW search tools and to retrieve Web documents for their information needs by using them effectively. It analyzes the characteristics, functions, and advantages and disadvatages of each search tool, while search tools are divided broadly by two categories-subject directory services (Kor-seek, DIR, ZIP, Netquest21, Simmany) and keyword search engines (Simmany, Kachine, Jungbotamjung, Anysearch, Unifinder, Webglider, Missdachanni). It provides the selection criteria of search tools for users who have information needs. In addition, the study also attempts to contribute to the improvements in designing Korean WWW search tools, as investigating their shortcomings.

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Influence of Rainfall on Cyanobacterial Bloom in Daechung Reservoir

  • Ahn, Chi-Yong;Kim, Hee-Sik;Yoon, Byung-Dae;Oh, Hee-Mock
    • Korean Journal of Ecology and Environment
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    • v.36 no.4 s.105
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    • pp.413-419
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    • 2003
  • The water quality and algal communities in the Daechung Reservoir, Korea, were monitored from summer to autumn in 1999 and 2001. Although the average weekly precipitations during June and July were very similar in 1999 and 2001, they were much different during August and September, the so-called blooming season. The rainfall in 1999 increased about 70% after late August, whereas it decreased to the one-fifth level in 2001. The higher concentrations of chlorophyll- a, phycocyanin, and cyanobacteria were observed in 2001, which resulted in the dense algal bloom. In addition, in 2001, the cyanobacterial percentage remained above 80% during the investigation period, and the cyanobacteria were exclusively composed of Microcystis spp. Conversely, there was no report on the algal bloom in 1999. However, the peak bloom seasons were the same for both years, from late August to early September, irrespective of the amount of precipitation. These results suggest that the magnitude and duration of rainfall before bloom season are important factors determining the extent of cyanobacterial bloom in this system.

Optimized Design of O-ring Groove in LPG Filling Unit Using Taguchi Experimental Method (다구찌 실험법을 이용한 LPG 충전노즐 O-링 그루브의 최적화 설계연구)

  • Kim Chung-Kyun
    • Journal of the Korean Institute of Gas
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    • v.10 no.2 s.31
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    • pp.40-46
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    • 2006
  • In this paper, the optimized design of a rectangular O-ring groove has been analyzed for a maximum Cauchy stress and maximum strain using the Taguchi method. This method may efficiently optimize the design parameters for an O-ring groove of a LPG filling unit. The computed FEM results indicate that the optimized design parameters can only be drawn by nine experimental numbers of iterations when the Taguchi design technique has been employed with a finite element method. This means that the Taguchi design method is very useful for the optimization design of O-ring rectangular groove geometry. Based on the computed FEM results by the Taguchi design technique, the dimensions of a groove geometry are given as h=2.5 mm, d=2.74 mm, c=0.15 mm, and w=3.0 mm. In this study, the initial compression ratio of O-rings is recommended as 8.7% for a gas supply pressure of 18 $kg/cm^2$.

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Mean Square Response Analysis of the Tall Building to Hazard Fluctuating Wind Loads (재난변동풍하중을 받는 고층건물의 평균자승응해석)

  • Oh, Jong Seop;Hwang, Eui Jin;Ryu, Ji Hyeob
    • Journal of Korean Society of Disaster and Security
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    • v.6 no.3
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    • pp.1-8
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    • 2013
  • Based on random vibration theory, a procedure for calculating the dynamic response of the tall building to time-dependent random excitation is developed. In this paper, the fluctuating along- wind load is assumed as time-dependent random process described by the time-independent random process with deterministic function during a short duration of time. By deterministic function A(t)=1-exp($-{\beta}t$), the absolute value square of oscillatory function is represented from author's studies. The time-dependent random response spectral density is represented by using the absolute value square of oscillatory function and equivalent wind load spectrum of Solari. Especially, dynamic mean square response of the tall building subjected to fluctuating wind loads was derived as analysis function by the Cauchy's Integral Formula and Residue Theorem. As analysis examples, there were compared the numerical integral analytic results with the analysis fun. results by dynamic properties of the tall uilding.