• Journal of the Korean Data and Information Science Society
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• 제27권6호
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• pp.1565-1571
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• 2016

이 논문에서는 중국소비자들을 대상으로 휴대폰의 원산국 효과에 따라 라이프스타일에서 어떤 차이점이 있는지 실증 분석해 보고자 한다. 분석 데이터는 Kim 등 (2006, 2007)에 의해 선행연구 된 바 있다. 그룹 멤버십은 휴대폰의 원산국 효과에 대한 응답을 바탕으로 응답자를 4개 그룹으로 분류하였다. 즉, 4개 그룹은 한국산 휴대폰을 선호하는 그룹 K, 일본산 휴대폰을 선호하는 그룹 J, 미국산 휴대폰을 선호하는 그룹 U, 그리고 중국산 휴대폰을 선호하는 그룹 C이다. 이러한 그룹 멤버십을 바탕으로 일원배치 분산분석과 단계적 판별분석을 이용하여 89개 라이프스타일 변수와 2개 개인정보로 이루어진 학습표본 (training sample)을 4개 그룹으로 분류하였다. 그 결과 한국산 휴대폰을 선호하는 그룹 K는 중국산 휴대폰을 선호하는 그룹 C에 비해 개방적이고, 진보적이고, 적극적이고, 그리고 개성이 강한 것으로 보였다.

• Restorative Dentistry and Endodontics
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• 제22권2호
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• pp.648-658
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• 1997

The purpose of this study was to compare the effects of various techniques on the quality and quantity of instrumentation in curved canals. Instrumentation time was evaluated too. Forty eight canals of resin blocks($35^{\circ}$) were divided into three groups and filed. In group A, 16 blocks were instrumented using a step-back technique with stainless steel(SS) K-file(Mani, Matsutani Seisakusho Co.,Japan). In group B, canals were prepared with SS K-files using the Endo-Angle (Nakanishi Dental MFG.CO.,LTD.,Japan). Group C was prepared using N i-Ti engine-driven instruments (Quantec Series $2000^{TM}$ system). Group A and B were filed from # 5 to # 25 at the apex followed by a 1 mm stepback technique, and the coronal half of the canals were flared with Gates Glidden burs(#2,3,4). Group C was instrumented from # 1 to # 8. After the instrumentation time was measured, canals were filled with India ink, and photographed, which to magnify the canal images 8 times. Using these photographs the apical portions were evaluated And scored from 1 to 4 according to the severity of ledging and zipping. On the same photographs, the area of the coronal two thirds of the canals were measured using a personal computer with the computer program Brain and Digitizer (SummaSketch III). The following results were obtained. 1. Instrumentation time was significantly shorter for group C, as opposed to group A and B(ANOVA, P<0.05). 2. The qualitative evaluation of the apical portions of the canals showed no significant difference between the groups(Kruscal-Wallis, p>0.05). 3. The area removed by group C was significantly smaller than group A and B(ANOVA, P<0.05).

• Archives of Pharmacal Research
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• 제18권6호
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• pp.385-390
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• 1995

The analytical methods for the analysis of cyclosporine (CsA), a fluorescence polarization immunoassay (FPIA) and HPLC method, were compared in a pharmacokinetic study of two CsA soft capsule formultaions ($Sandimmun^{\circledR}$; Sandoz, $Implanta^{\circledR}$; Hanmi). Sixteen healthy volunteers completed the study and each subjected single doses ($4{\tiems}100$ mg) of the test and the reference formulations in a two-way crossover design with a one-week drug-free interval between doses. Following each administration, whole blood concentrations of CsA were monitored over a period of 24 hour by both FPIA and HPLC methods. Blood concentrations nad pharmacokinetic parameters determined by either analytical method showed large intersubject variation, with the FPIA data showing relatively higher magnitude of intersubjecte variation than the HPLC data. The blood concentrations determined by FPIA were 1.1-1.3 times higher than those determined by HPLC. There were strong and significant correlations between the two methods (r>0.83 : p<0.0001). Intersubuject variation for the $AUC_{inf}{\;}and{\;}AUC_{24hr}$ of the test formulation was slightly reduced without statistical significance (paried -t test : p>0.05 $t_{max}$ was earlier nad $C_{max}$ was slightly lower for the test formulation, $AUC_{24h}, {\;}C_{max}, {\;}T_{max}$ and MRT determined separately from the data obtained by the two methods for the two formulations were examined by analyses of variance (ANOVA) for the bioequivalency evaluation. Results of ANOVA and confidence limits of terst/reference ratios of $AUC_{24th}$, $C_{max}$, $t_{max}$ and MRT, and statistical tests indicated the bioequivalence of the two formulations (i.e., test/reference ratio was within $100{\times}20%$) except for $C_{max}$ and $t_{max}$. The mean of tmax also showed 11.1% and 9.3% differences but the detection limit were 29.2% and 29.6% as determined by FPIA and HPLC resepctively. This experiments suggest that the data yielded for the two formulations demonstrated that they were bioequivalent.

• Composites Research
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• 제29권1호
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• pp.7-15
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• 2016

고분자 재료로 된 자동차부품들은 주로 사출성형으로 제작되며, 이 과정에서 뒤틀림, 침전 흔적, 용입선, 수축, 잔류응력 등의 결함이 발생한다. 본 연구를 통해서 이들 결함을 제거할 수 있는 차량용 폴리카보네이트 버튼의 사출성형 공정변수를 실험계획법을 이용하여 최적화 하였다. 공정변수로는 충전압력, 금형온도, 용융온도, 충전시간을 고려했으며 FEM, 다구치법, ANOVA를 사용하여 해석하고 최적화 하였다. 최적화 결과, 충전압력은 140 MPa, 금형온도는 $105^{\circ}C$, 용융온도는 $292.5^{\circ}C$, 충전시간은 1초, 등의 공정변수 값을 얻었으며, 10.2의 S/N 비를 얻었다. 수지의 용융온도가 가장 큰 영향을 미치며, 그 다음으로 금형의 온도였다.

• 한국도로학회논문집
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• 제8권4호
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• pp.145-157
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• 2006

도로건설사업에서 정책적인 의사결정이 필요한 경우, 다기준 평가방법인 AHP로 전문가 설문조사를 통한 정책적 분석을 시도하였다. 그러나 PI 제도 도입에 따라 도로관련 전문가뿐 아니라 지역주민, 환경단체 등 여러 관련 그룹의 다양한 의견이 제기되므로, 그룹간 의견을 종합하는 것이 필요하다. 본 연구에서는 도로건설사업의 PI 제도 운영실태를 연구 사례로 하여, AHP모형의 가중치 계산과정에서 각 그룹별로 설문조사한 자료를 이용하여, 의사결정과정에서 그룹별로 어떤 요인들을 중요시하는지 그룹별 AHP 분석을 시행하고, 그룹별 가중치가 반영된 통합 결과와 비교평가하였다. 분석결과, 그룹간 평가항목에서 분산분석(ANOVA)에 유의한 차이가 있는 것으로 분석되어, 각 그룹마다 중요하게 여기는 평가항목의 우선순위가 상이함이 확인되었다. 종합평가 결과 평가대안은 동일한 결과를 보였으나, 첫째, 그룹간 AHP 분석결과 전문가 그룹과 주민 그룹간, 전문가 그룹과 시민단체 그룹간에 유의한 차이가 있어, 그룹별 평가 필요성이 제기되었다. 둘째, 통합평가를 위한 그룹간 평가가중치 산정결과에도 현저한 차이가 나타났으며, 가중치를 고려한 AHP분석방법이 다양한 그룹의 의사결정 지원도구로 활용될 수 있다고 판단된다.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2002년도 춘계 학술발표회 논문집
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• pp.85-90
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• 2002

Microarray technology allows the monitoring of expression levels for thousands of genes simultaneously. In time-course experiments in which gene expression is monitored over time we are interested in testing gene expression profiles for different experimental groups. We propose a statistical test based on the ANOVA model to identify genes that have different gene expression profiles among experimental groups in time-course experiments. Using this test, we can detect genes that have different gene expression profiles among experimental groups. The proposed model is illustrated using cDNA microarrays of 3,840 genes obtained in an experiment to search for changes in gene expression profiles during neuronal differentiation of cortical stem cells.

• 한국운동역학회지
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• 제16권3호
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• pp.95-103
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• 2006

The purpose of this study was to analyze a change of maximal grip forces and EMG of agonists in upper extremity of 8 professional Ssirum players according to Satbar-grip patterns, to elucidate prime agonist muscles, contribution rate of each muscle, and a difference on EMG in upper extremity. one-way ANOVA(RM) performed for average and maximal values of each player after standardization and statistical significance was set as p<.05. The result includes the following: the highest grip force was A type with a statistic significance using one-way ANOVA and Duncan's comparison between A and C type. In summary the highest grip force was exerted on extension in the wrist than flexion in all grip types. Average and maximal values of biceps brachii and brachioradialis muscles were statistically significant and ones of flexor carpi ulnaris and extensor capi ulnaris were not.

• 소성∙가공
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• 제15권1호
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• pp.65-70
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• 2006

In recent industry, with the miniaturization and high-precision of machine part, the development of mold manufacturing technology for mass production is accompanied by the development of new technology such as IT and BT In this study, the spiral type injection mold with a $200{\mu}m$ thickness is made to. investigating the influence of injection molding parameter and the flow length is measured through an experiment. Besides, Taguchi method is used in this experiment and the obtained data are analyzed using ANOVA method.

• 품질경영학회지
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• 제16권1호
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• pp.43-48
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• 1988

Most of silicone used for water repellent finish is MHP (methyl hydrodiene polysiloxane), which is formed by hydrolysis and condensation polymerization of MHD (methyl hydrodiene dichlorosilane: Me H Si $Cl_2$). The cross-linking theory explains the water repellent mechanism of MHP. The silicone finish on fiber could improve in handle, softness, abrasion resistance, soil repellency, tear strength and crease resistance, as well as water repellency. According to using method silicone-water repellent finishing agents, could be devided into air dry type and curing type. MHP is the typical curing type of water repellent finishing agent, and this type requires the curing temperature above $150^{\circ}C$ at least. High curing temperature is the very drawback of this curing type. For this reason, there has been global interest in the lowering of its temperature. The objective of this study is to investigate merits of alkali treatment for silicone finishing by ANOVA and LSD (least significant difference).

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.28-33
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• 2004

At present, industry and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. This paper presents an investigation into MQL(Minimum Quantity Lubrication) machining with the objective of deriving the optimum cutting conditions for the turning process of SM45C. To reach these goals several finish turning experiments were carried out, varying cutting speed, feed rate and oil quantity, with MQL. The surface roughness results of tests were measured and the effects of cutting conditions were analyzed by the method of Analysis of Variance(ANOVA). From the experimental results and ANOVA, it is found that a better surface roughness can be obtained by decreasing oil quantity and feed rate.