• Title/Summary/Keyword: T-test analysis

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A Cross-cultural study of Body Image Perceptions between Korean and British University Students

  • Kim, Bu-Yong;Lee, Seunghee
    • Journal of Fashion Business
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    • v.19 no.6
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    • pp.14-27
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    • 2015
  • This study explores the comparison of body image, body satisfaction, and clothing behaviors between Korean and British young women. Body image was measured by two methods: visual and verbal. For the data analysis, the Statistical Package for Social Science (SPSS) Version 16.0 for Windows was used to provide descriptive statistics, an independent sample t-test, and paired sample t- tests were applied in this study. Our results show that Korean and British female college students perceived ideal-body images that were smaller than their self defined body images. The ideal and self-images were significantly different in both groups. Both groups were dissatisfied with their own body size. The study was limited to a small sample size. Future studies using more participants from a more diverse age group and ethnic groups are recommended. The study will help marketers and retailers develop new products and new markets aimed at Korean and British women related to body image and body satisfaction.

Permutation Predictor Tests in Linear Regression

  • Ryu, Hye Min;Woo, Min Ah;Lee, Kyungjin;Yoo, Jae Keun
    • Communications for Statistical Applications and Methods
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    • v.20 no.2
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    • pp.147-155
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    • 2013
  • To determine whether each coefficient is equal to zero or not, usual $t$-tests are a popular choice (among others) in linear regression to practitioners because all statistical packages provide the statistics and their corresponding $p$-values. Under smaller samples (especially with non-normal errors) the tests often fail to correctly detect statistical significance. We propose a permutation approach by adopting a sufficient dimension reduction methodology to overcome this deficit. Numerical studies confirm that the proposed method has potential advantages over the t-tests. In addition, data analysis is also presented.

An Acoustical Study of Korean 's' (국어 'ㅅ' 음가에 대한 음향학적 연구)

  • Mun Seung-Jae
    • MALSORI
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    • no.33_34
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    • pp.11-22
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    • 1997
  • The degrees of aspiration in Korean [ㅅ] and [ㅆ] were measured in terms of VOT. The measurements were compared to the aspiration in Korean stops and affricates. It was shown that [ㅅ] should be classified as an 'aspirated' sound with Korean aspirated stops and affricates [$p^h, {\;}t^h, {\;}k^h, {\;}t{\int}$], contrary to the traditional classification of the sound as unaspirated. [ㅆ] was confirmed to be in the same group as other Korean 'tense' sounds. It was pointed out that there was a gap in the typology of Korean consonants. The gap was created by the lack of the unaspirated counterpart of [ㅅ]. It was suggested that an extinct Korean sound [$\triangle$] be considered as a possible candidate for the gap. Also a perception test was suggested for the further acoustical analysis of Korean [ㅅ] and [ㅆ].

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Mechanism of Soil Remediation in Contaminated Area Using Vertical Drains (연직배수재(VDs)에 의한 오염지반정화 메커니즘 연구)

  • Lee Haeng Woo;Chang Pyoung Wuck;Kang Byung Yoon;Kim Hyun Tae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.47 no.5
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    • pp.63-71
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    • 2005
  • In-situ soil remediation mechanism through the vertical drains (VDs) is analyzed with numerical model as the error and complementary error function. Results from in-situ test and analysis indicate that the contaminant concentration ratio as initial one ( C/$C_0$) increases as the radius ratio ( r/R) increases from the injection well, and also increases as the depth ratio ( z/ H) increases from the top of contaminated area. The elapse time needed to attain $50\%$ and $90\%$ clean up level ($ t_{50},\;t_{90}$) increases as the radius ratio ( r/R) and the depth ratio ( z/ H) increase. As above results, the procedure of soil flushing in contaminated area using vertical drains makes progress from the top of injection well to the bottom of extraction well.

A Study on the Diagnostic Tests of the Internet Addiction Syndrome (인터넷 중독증 진단도구에 관한 연구)

  • Park, Ji-Whan
    • Journal of Korean Physical Therapy Science
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    • v.8 no.1
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    • pp.759-770
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    • 2001
  • The purpose of this study is through a analysis between old diagnostic tests of the Internet Addiction Syndrome to make a new test model for the physical disturbance problems for the addiction persons. Suggestion treatment for the Internet Addiction Syndrome are follows: 1. Try to decide in advance how much time you will spend on the Net time a day. 2. Decide how much you want the Internet to be a part of each area of your life and then allocate time accordingly. 3. You may decide that you want to keep the Internet at work, and shut the door on it when you leave for home. 4. To physical exercise regularly. 5. Take frequent breaks. 6. Seek out friends and acquaintances who couldn't care less about the Internet. 7. Interact with people in a non-wired world. 8. Consult a Dr. if you can't solved.

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Identification of Soil Actinomycetes Producing Anticancer Agent and Its Biological Activities (항암활성물질을 생산하는 토양방선균의 동정 및 함암물질의 생물학적 활성)

  • 박정민;문순옥;오두환
    • Microbiology and Biotechnology Letters
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    • v.22 no.4
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    • pp.347-352
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    • 1994
  • Cytotoxic test was performed by SRB assay on human epidermoid carcinoma HEp-2 cell line for screening the soil microorganism, secreting anticancer agent. One microorganism was selected among two thousand microorganisms for its highest cytotoxicity. And this microorganism was identified with Streptomyces species after performing of diaminopimeric acid and reducing sugar analysis of cell wall and analysing the cultural characteristics and named Streptomyces sp. SM 1119. The effect of anticancer agent in SM 1119 culture extract on the cell cycle was studied by using GG$_{o}$ synchronized NIH 3T3 cells. The extract inhibited the serum stimulation of GG$_{o}$ NIH 3T3 cell only within 1 hour after serum stimulation but not after 6 hours. The extract also reduced the amount of c-myc mRNA in Colo 320 cell. These results suggest that the anticancer agent in the extract inhibits the progression of cell cycle very early stages, probably from G$_{0}$ to G$_{1}$.

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Precipitates Behavior and Microstructure of Friction Stir Welded 2519Al Alloy (마찰교반 용접한 2519Al 합금 용접부의 석출거동 및 미세조직)

  • Bae, Jong-Mo;Park, Tae-Won;Baik, Doo-Hyun;Kim, Hung-Ju;Chang, Woong-Seong
    • Proceedings of the KWS Conference
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    • 2006.10a
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    • pp.109-111
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    • 2006
  • In this study, microstructure and mechanical properties for the friction stir welded 2519Al-T87 alloy of the thickness of 38.8mm were studied using DSC, OM, SEM and micro hardness tester. DSC analysis show that GP Zone, ${\theta}'$ and $\theta$ phases in upper part and ${\theta}'$ and $\theta$ phase in lower part of the FSW zone. Recrystallized large grains are observed in HAZ, and elongated small and large grain in the TMAZ. In SZ, very small grains forms by high plastic deformation and heat from friction by tool and specimen.

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Fault Location Algorithm with Ground Capacitance Compensation for Long Parallel Transmission Line (장거리 병렬 송전선로용 대지 정전용량 보상에 의한 고장점 표정 알고리즘)

  • Park, Chul-Won;Kim, Sam-Ryong;Shin, Myong-Chul
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.54 no.4
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    • pp.163-170
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    • 2005
  • This paper deals with an improved fault location algorithm with compensation ground capacitance through distributed parameter for a long parallel T/L. For the purpose of fault locating algorithm non-influenced by source impedance and fault resistance, the loop method was used in the system modeling analysis. This algorithm uses a positive and negative sequence of the fault current for high accuracy of fault locating calculation. Power system model of 160km and 300km long parallel T/L was simulated using EMTP software. To evaluate of the proposed algorithm, we used the several different cases 64 sampled data per cycle. The test results show that the proposed algorithm was minimized the error factor and speed of fault location estimation.

PSS Modeling and Cerification for #6 Generator of Boryong T/P (보령 T/P 6호기 PSS 모델링과 검증)

  • Choi, H.K.;Kim, D.J.;Moon, Y.H.;Kim, Y.H.;Yoon, Y.B.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.31-34
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    • 2002
  • It studied modelling about employing analog PSS in domestic 500MW grade standard thermoelectric power plant in this paper. Modeling and parameters were verified by simulation of PSS response characteristics measured in AVR step examination and using power plant system model parameters decided by generator characteristics test. Through this PSS modelling research, contributed in domestic electrical power system small signal stability as that do modelling to be possible exact analysis of power system.

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Combined BOLD fMRI and Transcranial Magnetic Stimulation Study: Evaluation of Ipsilateral Motor Pathway of Stroke Patients

  • 배성진;장용민;장성호;변우목;강덕식
    • Proceedings of the KSMRM Conference
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    • 2001.11a
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    • pp.104-104
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    • 2001
  • Purpose: In this study, we investigated the possible motor pathways of hemiplegic stroke patients usin combined TMS and BOLD fMRI approach and evaluated the correlation between TMS a fMRI methods. Method: Four subjects, who demonstrated left hemiplegia after stroke, are included. TMS was performed using a Dantec Mag2 stimulator (Dantec Company, USA) in single puls mode with figure eight-shaped coil. Following TMS localization, The BOLD T2*-weight images were acquired with echo planar imaging sequence (TR = 1.2 sec, TE = 60 msec, and flip angle = 90). Motor activation was studied by means of a repetitive fing flexion-extension task. The stimulation protocol comprised 10 cycles of alternating activati and rest (10 images per cycle). Total 60 cycles were performed and each cycle take abou 1.5 sec. The resulting images were then analyzed with STIMULATE (CMRR, U, o Minnesota) to generate functional maps using a student t-test (p < 0.0005) and cluste analysis.

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