• Title/Summary/Keyword: 판정지수

Search Result 225, Processing Time 0.029 seconds

A Analysis of Heavy Tailed Distribution for Files in Web Servers Using TTT Plot Technique (TTT 타점법을 이용한 웹서버 파일 분포의 후미성 분석)

  • Jung, Sung-Moo;Lee, Sang-Yong;Jang, Joong-Soon;Song, Jae-Shin;Yoo, Hae-Young;Choi, Kyung-Hee
    • The KIPS Transactions:PartA
    • /
    • v.10A no.3
    • /
    • pp.189-198
    • /
    • 2003
  • In this paper, we propose a method of analysis to show the heavy-tailed statistical distribution of file sizes in web servers, using TTT plot technique. TTT plot technique, a well-known method in the area of reliability engineering, determines that a distribution of samples fellows a heavy tailed one when their TTT statistical plots are lied on a straight line. We performed an intensive simulation using data gathered from real web servers. The simulation indicates that the proposed method is superior to Hill estimation technique or LLCD plot method in efficiency of data analysis. Moreover, the proposed method eliminates the possible decision error, which Pareto distribution or traditional method might cause.

The Correlation Among the Activity of Daily Living, the Manual Ability and the Gross Motor Function (뇌성마비 아동의 일상생활활동 수행능력과 사물조작기능, 대동작기능의 상관관계 연구)

  • Ko, Yu-Jeong
    • The Journal of Korean Academy of Sensory Integration
    • /
    • v.10 no.1
    • /
    • pp.11-20
    • /
    • 2012
  • Objective : The purpose of this study is intended to provide useful information about the disability evaluation indicators, the Modified Barthel Index (MBI) as a measurement tool for assessing the ability to perform activities of daily living through the correlation between the Modified Barthel Index (MBI) and the Manual Ability Classification System (MACS), and Gross Motor Function Classification System (GMFCS). Methods : The subject was 82 children with cerebral palsy. The validity was aexamined by calculation of correlation between the Modified Barthel Index (MBI), the Manual Ability Classification System (MACS) and Gross Motor Function Classification System (GMFCS). Results : There were a good significant correlation between the MBI and MACS (r = -.765, p <0.001), the MBI and the GMFCS (r = -.851, p < 0.001) and the MACS and the GMFCS (r = .615, p <0.001). Conclusion : The close correlation between the MBI that is used as the basis of grading cerebral palsy and high reliability and validity of the MACS, GMFCS suggest that disability evaluation indicators, the MBI could be useful for children with disabilities.

  • PDF

비만 중학생에서 캠프 프로그램을 이용한 영양교육 효과

  • 승정자;성미경;최미경;김미현;이윤신;조혜경;김경희
    • Proceedings of the KSCN Conference
    • /
    • 2003.11a
    • /
    • pp.1061-1062
    • /
    • 2003
  • 현대사회에서 청소년기에 발생하는 영양문제 중 가장 빈번히 나타나는 청소년기 비만은 성인 비만으로 이행되기 쉬우며, 당뇨병, 지방간, 고혈압과 같은 각종 성인병의 발생과도 관련이 있다. 또한 체형에 대한 관심이 증가하고 있는 현대사회에서 편견의 대상이 됨으로 인한 심리적 장애를 발생시키기도 한다. 이에 따라 비만인의 체중조절을 위한 다양한 교육프로그램들이 실시되고 있는데, 현재까지의 실시되고 있는 프로그램들은 강의식교육이 주류를 이루고 있어 적극적인 교육효과를 이끌어 내는데 많은 한계점을 가지고 있었다. 이에 본 연구자들은 지역보건소를 중심으로 2박 3일간의 청소년 캠프 프로그램을 통하여 VTR감상, CAN-Pro를 이용한 섭취 식단의 평가 및 영양상담, 영양뷔페, 역할극, 다양한 영양지식 응용게임, 일상생활에서 활용가능 한 운동교육, 비만의 원인과 건강과의 관련성 및 식사요법 등에 대한 강의를 실시하였다. 캠프 참가자들은 부천시에 거주하는 중학생으로 사전에 신장과 체중에 대한 조사를 바탕으로 비만으로 판정된 총 42명(남 28명, 여 14명)으로 하였다. 캠프 시작전과 후에 설문조사를 통하여 영양지식, 영양태도, 자아만족도에 관한 조사를 실시하여 프로그램 직후의 효과를 판정하였고, 일상적인 영양소섭취상태를 평가하기 위해 24시간 회상법을 통하여 캠프참가 전날의 식이섭취 조사를 실시하였다. 대상자의 평균 연령은 13.9세로 남녀학생 간에 유의적인 차이가 없었으며, 신장은 남학생이 160.7cm, 여학생이 156.8cm였다. 체중, 체질량지수, 비만지수, 허리엉덩이둘레비 및 체지방 함량은 남학생이 각각 75.5kg, 29.1kg/$m^2$, 30.1, 0.89, 33.3%이었고, 여학생이 각각 67.8kg, 27.5kg/$m^2$, 25.3, 0.81, 34.6%였다. 영양소 섭취량에 대한 분석결과 열량의 경우 남학생이 2137.7㎉, 여학생이 2059.7㎉ 섭취수준을 보였으며, 총열량에 대한 당질, 단백질, 지질의 섭취 비율은 남학생 57:14:29, 여학생 60:13:26으로 남여학생 모두 총열량에 대한 지질의 섭취 비율이 높았다. 프로그램의 효과 평가를 위하여 남녀중학생을 모두 합하여 비교하였을 때 프로그램 실시 후 영양태도가 유의적으로 향상되었으며(p<0.001), 자아만족도 및 영양지식에 있어서는 유의적인 변화가 나타나지 않았다. 그러나, 성별로 분류하여 비교 시 남학생은 영양태도(p<0.01)와 영양지식(p<0.05)이 유의적으로 향상되었고, 여학생의 경우에는 영양태도(p <0.01)에서만 유의적인 향상을 나타내었다. 이상의 결과에서 2박 3일간의 청소년 캠프는 남녀 비만중학생에 있어 영양태도의 향상을 가지고 왔으며, 남학생의 경우에는 영양지식에도 유의적인 향상이 나타났다. 그러나 영양교육의 효과가 실제적인 영양소섭취 및 비만도의 변화에 영향을 미치는지를 알아보기 위해서는 지속적인 추적 관리를 통한 효과판정이 필요한 것으로 보여진다.

  • PDF

Low-cost Impedance Technique for Structural Health Monitoring (임피던스 기반 저비용 구조물 건전성 모니터링 기법)

  • Lee, Jong-Won
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.19 no.12
    • /
    • pp.265-271
    • /
    • 2018
  • This paper presents a method for detecting damage to a structure at low cost using its impedance. The impedance technique is a typical method to detect local damage for structural health monitoring. This is a common technique for estimating damage by monitoring the electro-mechanical admittance signal of the structure. To apply this technique, an expensive impedance analyzer is generally used. On the other hand, it is necessary to develop a low-cost variant to effectively disseminate the technique. In this study, a method based on the transfer impedance using a function generator and digital multimeter, which are generally used in the laboratory instead of an impedance analyzer, was developed. That is, this technique estimates the damage by comparing the damage index using the amplitude ratio of the output voltage measured in the healthy and damaged state. A transfer impedance test was carried out on a steel specimen. By comparing the damage index, the presence of damage could be assessed reasonably. This study is a basic investigation of an impedance-based low-cost damage detection method that can be used effectively for structural health monitoring if supplemented with future research to estimate the damage location and severity.

Biological Evaluation of Water Quality and Community Structure of Benthic Macroinvertebrates in the Pyungchang River Water System, Gangwon-do, Korea (강원도 평창강 일대 저서성 대형무척추동물의 군집구조 및 수질의 생물학적 평가)

  • 박준우;황명기;어성준;최신석;정평림
    • Korean Journal of Environmental Biology
    • /
    • v.19 no.2
    • /
    • pp.119-128
    • /
    • 2001
  • A biological assessment of water quality was carried out in the Pyungchang River water system, Gangwon-do, Korea from September 1999 through August 2000. The benthic macroinvertebrates collected seasonally from 15 field sites were identified mostly up to species level. Benthic macroinvertebrates composed of 109 species, 77 genera, 31 families, 10 orders, 4 classes in 4 phyla. Dominant species occurring in all the field sites were mostly ephemeropterans and trichopterans. On the basis of the values of species diversity and biological indices such as Trent Biotic Index (TBI) Modified Biological Monitoring Working Party Score System (BMWP) and Biotic Index (BI), the Pyungchang River Water system was generally regarded as showing oligosaprobic water quality.

  • PDF

Derivation of Repair or Reinforcement Priority of Dam Members using State Assessment (상태평가를 이용한 댐 시설물 부재별 보수·보강 우선순위 도출)

  • Kim, Tae Hyung;Park, Jiyeon;Kwon, Ji-Hye;Choi, Hong Suk
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2015.05a
    • /
    • pp.285-285
    • /
    • 2015
  • 댐 및 저수지 시설물은 노후화나 안전성 미확보로 인한 파손 또는 붕괴 발생 시 하류부에 막대한 인명과 재산피해 등 치명적인 결과를 초래하게 된다. 이러한 대형 안전사고를 예방하고자 시설물의 안전관리에 관한 특별법에서는 댐 시설물을 규모별로 1, 2종 시설물로 구분하고, 이에 대해 주기적으로 안전점검 및 정밀안전진단을 실시하도록 제도화하는 한편 진단 결과에 따라 보수 보강 등의 안전조치를 의무화하고 있다. 구조물 결함에 따른 보수 보강은 보수재료와 공법 선정시 공법의 적용성, 구조적 안전성, 경제성 등을 종합적으로 검토하여 결정하여야 한다. 손상 부위에 대한 보수 보강은 제한된 예산과 인력을 효율적으로 투자하기 위해 보수재료 및 공법의 선정 뿐만 아니라 보수 보강이 이루어져야 하는 부재에 대한 우선순위를 산정하는 것이 최우선적으로 선행되어야 한다. 안전점검 및 정밀안전진단 세부지침에서는 보수 보강 대책 마련 시안전점검 및 정밀안전진단 결과를 기초로 하여 적정 재료 및 공법을 선정하고, 보수 보강의 수준 및 우선순위를 결정하도록 명시되어 있다. 하지만 우선순위 결정에 대한 가이드라인이 부재하여 불필요한 시공과 비효율적인 예산 투입으로 인해 국가예산의 낭비되고 시설물의 안전까지 위협받게 되는 경우가 발생하고 있다. 따라서 본 연구에서는 시설물의 상태에 따른 적절한 보수 보강 필요성을 판단하고 보수 보강 수준 및 우선순위를 결정하기 위한 방법론을 개발하였다. 댐 시설물에 대한 안전점검 및 정밀안전진단의 종합평가는 평가대상 개별시설에 대하여 상태 평가 및 안전성 평가를 실시한 후 그 결과에 의해 산출된 상태평가지수와 안전성평가지수를 비교하여 평가단계별로 그 결과를 취합하여 종합평가를 실시하고 있다. 따라서 상태평가에 의해 산정된 종합평가 결과를 이용하여 개별 부재의 상태평가값 산정을 위해 하부 단계의 가중치 및 평가 지수 역산하고, 재산정된 가중치 및 평가지수를 이용하여 각 부재에 대한 보수 보강 우선순위를 산정하고자 하였다. 개발된 방법론은 점검 진단 책임기술자 및 시설물 관리주체 담당자가 댐 시설물의 개별부재에 대한 보수 보강 실시 여부를 판정할 수 있는 기준으로, 보수 보강에 대한 정책 결정시 경제성을 고려한 신뢰도 있는 기준으로 활용될 수 있을 것으로 기대된다.

  • PDF

the Comparative Analysis on Export Competitiveness for Trade in Service between Korea and China (한·중 서비스 무역의 수출경쟁력 비교분석)

  • Yoo, Il-Seon;Kim, Young-Hwan
    • International Area Studies Review
    • /
    • v.13 no.2
    • /
    • pp.643-666
    • /
    • 2009
  • When it comes to current balance, both of Korea and China enjoy the trade surplus in goods while both countries suffer trade deficit in service. This facts demonstrate that two countries have comparative disadvantages in service industry. In order to identify the international competitiveness of trade in service between Korea and China, several indexes such as TSI, RSCA and IMS was calculated, using the IMF's balance of payments (BOP) statistics as proxy. The results of this analysis are as follows. Korea has a comparative advantage in four sectors (Transportation services, Financial services, Royalties & license fees and Personal cultural recreation), while China has a comparative advantage in five sectors (Travel, Communication services, Insurance services, Computer & information services and Other Business services). Construction services are indeterminate. However, the competitiveness of the two sectors-communication and computer & information-which China has a comparative advantage will be transferred to Korea if some effort to reinforce the competitiveness is added because the gap is being narrowed.

Assessment of Water Quality in Namdae-Stream, Yeongok-Stream and Sacheon-Stream Using Trophic Status and Epilithic Diatom Indices (부착규조지수와 영양단계 평가를 이용한 남대천, 연곡천과 사천천의 수질 평가)

  • Kim, Yong-Jin;Lee, Ok-Min
    • Korean Journal of Ecology and Environment
    • /
    • v.43 no.1
    • /
    • pp.117-128
    • /
    • 2010
  • The water qualities of Namdae-stream, Yeongok-stream and Sacheon-stream were examined, by using physicochemical factors, trophic status and epilithic diatoms from May 2008 to February 2009. The physicochemical water qualities of three streams were, except for some construction areas and sites of downstream, generally good, having less concentration than BOD of $2\;mg\;L^{-1}$. As for the sites of downstream, there were ongoing pollution such as graduation of nutrients in Namdae-stream and Sacheon-stream, due to salinity of seawater and topographical feature of the closed estuary. The examination of trophic status of Namdae-stream showed mesotrophic status in all the sites. Also, eutrophication was in progress as from the upstream to the downstream of Yeongok-stream, and Sacheon-stream showed eutrophic status in all its sites. As a result of the biological water quality assessment, Namdae-stream, excluding the downstream site, came out to be $\beta\sim\alpha$-oligosaprobic, and biological water quality was good, having TDI less than 50. Some construction sites and downstream site of Namdae-stream are $\beta$-mesosaprobic, and with the TDI over 70, the biological water quality assessment came out to be polluted. Yeongok-stream is $\beta\sim\alpha$-oligosaprobic, and its biological water quality is good, having TDI less than 40. Sacheon-stream, excluding the upstream site on May 2008 and February 2009, is $\beta\sim\alpha$-mesosaprobic, and its TDI over 70 shows that it has been polluted. The correlation analysis showed a high correlation in both DAlpo and TDI. Also, biological assessment of water quality (DAIpo, TDI) showed higher correlation with TSI rather than BOD.

Outlier Detection By Clustering-Based Ensemble Model Construction (클러스터링 기반 앙상블 모델 구성을 이용한 이상치 탐지)

  • Park, Cheong Hee;Kim, Taegong;Kim, Jiil;Choi, Semok;Lee, Gyeong-Hoon
    • KIPS Transactions on Software and Data Engineering
    • /
    • v.7 no.11
    • /
    • pp.435-442
    • /
    • 2018
  • Outlier detection means to detect data samples that deviate significantly from the distribution of normal data. Most outlier detection methods calculate an outlier score that indicates the extent to which a data sample is out of normal state and determine it to be an outlier when its outlier score is above a given threshold. However, since the range of an outlier score is different for each data and the outliers exist at a smaller ratio than the normal data, it is very difficult to determine the threshold value for an outlier score. Further, in an actual situation, it is not easy to acquire data including a sufficient amount of outliers available for learning. In this paper, we propose a clustering-based outlier detection method by constructing a model representing a normal data region using only normal data and performing binary classification of outliers and normal data for new data samples. Then, by dividing the given normal data into chunks, and constructing a clustering model for each chunk, we expand it to the ensemble method combining the decision by the models and apply it to the streaming data with dynamic changes. Experimental results using real data and artificial data show high performance of the proposed method.

Bolt-joint Structural Health Monitoring Technique Using Transfer Impedance (전달 임피던스를 이용한 볼트 접합부 구조 건전성 모니터링 기법)

  • Lee, Jong-Won
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.7
    • /
    • pp.387-392
    • /
    • 2019
  • A technique was researched to detect bolt looseness using a transfer impedance technique (the dual piezoelectric material technique) for monitoring the structural health of a bolt joint. In order to use the single piezoelectric material technique, an expensive impedance analyzer should be used. However, in the transfer impedance technique, low-cost fault detection can be performed using a general function generator and a digital multimeter. A steel plate frame test specimen composed of bolt joints was fabricated, and the tightening torques of the bolts were loosened step by step. By using the transfer impedance method, the damage index was obtained. It was found that the presence of faults could be reasonably estimated using the damage index, which increased with the degree of bolt looseness. An experiment was performed on the same specimen using the single piezoelectric material technique, and the results showed a similar tendency. It could be possible to estimate the damage of a bolt joint at low cost by eliminating the expensive impedance analyzer. This method could be used effectively for structural health monitoring after carrying out a study to estimate the fault location and severity.