• 한국의류학회지
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• 제21권1호
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• pp.10-18
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• 1997

The purpose of the study were to classify apparel shoppers into specific apparel shopping orientation groups and to compare the classified groups on importance of store attributes, information sources, lifestyle activities, and demographic characteristics. The data were obtained from questionnaires filled out by 317 women in Daegu and were analysed by utilizing factor analysis, cluster analysis, and ANOVA. By cluster analysis of apparel shopping orientation factors, three groups were identified: Recreational shopper (48%), Economic shoppers (20%), Apathetic shoppers (32%). The results of ANOVA indicated that the cluster groups are significantly different in importance of store attributes (product assortment and shopping convenience), information sources (marketer-driven and consumer -driven), lifestyle activities (regular activities and activites for self-improvement), and IPmnuraDhic characteristics (age and education).

• 한국공작기계학회논문집
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• 제12권6호
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• pp.36-43
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• 2003

In machining of ceramic materials, they are very difficult-to cut materials because of there high strength and hardness. Machining of ceramics are characterized by cracking and brittle fracture. Generally, ceramics are machined using conventional method such as finding and polishing. However these processes are generally costly and have low MRR(material removal rate). This paper focuses on determining the optimal levels of process parameters for products with CNC machining center. For this purpose, the optimization of cutting parameters is performed based on experimental design method. A design and analysis of experiments is conducted to study the effects of these parameters on the surface roughness by using the S/N ratio, analysis of ANOVA and F-test. Cutting parameters, namely, cutting speed, feed and depth of cut are optimized with consideration of the surface roughness.

• Journal of Advanced Marine Engineering and Technology
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• 제38권8호
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• pp.961-967
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• 2014

In onshore and offshore plant engineering, a broad use of pipe system have been achieved and accordingly related technologies has been developed especially in the field of flow control valves. The aim of this study is to suggest the quadruple offset butterfly valve for bi-directional applications which show equivalent operating torque characteristics of the triple offset butterfly valve. Seat design parameters for the quadruple offset butterfly valve are determined by the proposed method utilizing both ANOVA (analysis of variance) and the orthogonal array. Through additive model considering the effect of design parameters on seating torque, mean estimation is performed and thus its optimization results are verified by design of experiment results. The insight obtained from the present study is beneficial for valve design engineers to develop reliable and integrated design of the quadruple offset butterfly valve.

• 한국생산제조학회지
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• 제21권5호
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• pp.755-760
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• 2012

In this study, three dimensional cutting force components and surface roughness appeared in high speed cutting by using tungsten carbide endmill tools implanted ion or not found mutual relations through several analysis of statistical dispersion. It is showed that cutting force(Fx) is affect with spindle speed and feed rate, cutting force(Fy) is affect with spindle speed and ion implantation time and cutting force(Fz) is affect with feed rate in interaction through the statistical method of ANOVA of cutting force and surface roughness, it is analyzed that it is affected of spindle speed and feed rate in surface roughness.

• 한국방재안전학회논문집
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• 제12권2호
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• pp.25-34
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• 2019

본 연구에서는 산화구 방법으로 하수처리를 하는 공공 하수처리장을 선정하여 통계적인 방법으로 처리장의 수질 및 운영의 효율을 분석하였다. 얻어진 수질 데이터는 유입수 및 배출수의 pH, 온도, BOD, SS, T-N, ${NH_4}^+-N$ 및 T-P였다. 데이터 분석은 군집분석, 상관분석, ANOVA 분석, 클러스터 분석으로 수행되었다. 통계분석 결과, 하수 처리장의 유입 유량은 여름에 가장 높았으며 평균 유속은 $3.000m^3/s$이었다. Box plot 결과에 따르면, 하수의 COD, 총인 농도는 계절에 변화에 따라 크게 차이가 없었다. Pearson 상관관계 분석결과는 유입수에서 BOD, COD, T-N 및 T-P 간에 강한 양의 상관관계를 보였다. 계절변화에 따른 BOD와 T-N 농도는 겨울철에 가장 높았고, 계절에 따른 온도의 영향은 COD와 T-P가 가장 높았다. BOD는 수온과 음의 상관관계를 보였으나 HRT, SRT, C/N과 같은 공정인자는 양의 상관관계를 나타내었다. 유입수 온도가 높을수록 BOD 농도가 낮아지는 현상을 보였으며, 체류 시간이 단축될수록 BOD의 처리 효율이 저하되었다. T-N은 효율적인 처리를 위해 긴 체류 시간이 필요했으나 T-P는 공정인자의 변화에 따른 상관관계도에서 다소 적게 나타났다.

• 분석과학
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• 제23권4호
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• pp.363-370
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• 2010

소각재를 이용한 다이옥신의 매체특성이 반영된 표준물질 제조 기법을 정립하고, 균질성 및 안정성이 확보된 숙련도 평가용 시료로서의 적용 가능성을 평가하였다. 국내 환경분석에 적합한 폐기물 분석용 다이옥신 표준물질을 제조하여 10회 이상 반복 측정한 결과, Dioxin 17개 이성체별 농도의 상대표준편차는 2.6~15.7%로 나타냈다. 측정결과를 일원분산분석(one-way ANOVA)을 이용하여 균질도를 평가하였다. 측정과정과 균질도를 이용하여 불확도를 평가한 결과, 다이옥신의 확장불확도 값은 0.114~7.091로 산정되었다.

• Journal of Welding and Joining
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• 제32권1호
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• pp.28-33
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• 2014

In this paper, I-butt welding with 6mm thickness using Plasma-GMA welding was carried out. And weld characteristics of the Al-5083 aluminium alloy for Plasma-GMA hybrid welding was evaluated. The orthogonal experimental design was used to investigate the influence of plasma-MIG welding parameters such as plasma current, wire feeding rate, MIG-welding voltage and welding speed on the weld bead geometry and tensile strength using the ANOVA(Analysis of Variation). Then we conducted evaluation of contribution for process parameters. ANOVA results show that bead dimensions are affected by wire feeding speed, welding voltage and welding speed and tensile strength is mainly affected by welding speed and plasma arc current. Tensile strength was decreased by rise in plasma welding current because GMA welding current was decreased by plasma arc.

• 응용통계연구
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• 제15권2호
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• pp.405-414
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• 2002

반복이 같은 이원배치 혼합효과 분산분석모형에서 무정보 사전분포를 이용하여 오차분산을 추정하는 문제를 생각하고자 한다. 먼저 무정보 사전분포로 제프리스사전분포, 준거 사전분포 그리고 확률일치 사전분포를 유도하고 이들 각각의 사전분포들에 대하여 주변사후분포를 제시하였다. 끝으로 실제 자료를 근거로 오차분산의 주변사후밀도함수에 대한 그래프와 오차분산에 대한 신용구간들을 구하고 이 구간들을 비교한다.

• 응용통계연구
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• 제8권1호
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• pp.75-87
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• 1995

데이터 분석 과정에서 일부 데이터를 변화시키거나 또는 적용하고자 하는 통계적 모형의 성격을 변화시킬 때 이러한 변화가 분석 결과에 어떤 영향을 미치는가를 즉시에 알아보기 위해 동적그래픽스의 기법을 이용한다. 본 논문에서는 분산분석 과정을 동적그래픽스로 구현하는 방법과 이를 구현하는데 필요한 여러가지 형태의 플롯을 설명하고 이원 분산분석 모형에서 구현한 동적그래픽스 소프트웨어를 소개한다.

• 지식경영연구
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• 제5권1호
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• pp.57-67
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• 2004

An air traffic control organization will require knowledge management to keep competitive advantage. A traffic controllers are forced to share their tacit as well as explicit knowledge among their organization to get aircraft's safety and efficient operation. The purpose of this study is to examine which factors influence the air traffic controllers' intention of sharing knowledge for the case of Civil Aviation Safety Authority, Ministry of Construction and Transportation. An ANOVA analysis shows that a difference exists between ages in terms of open mindedness towards sharing knowledge, the search for new knowledge and the recognition of the importance of sharing knowledge.