• The Korean Journal of Applied Statistics
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• v.21 no.4
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• pp.621-630
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• 2008

This paper discusses how to construct a generalized marginal logit model for analyzing repeated polytomous response data when some factors are applied to larger experimental units as treatments and time to a smaller experimental unit as a repeated measures factor. So, two different experimental sizes are considered. Weighted least squares(WLS) methods are used for estimating fixed effects in the suggested model.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.6C
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• pp.277-285
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• 2009

A series of undrained cyclic triaxial tests were carried out to investigate the cyclic shear stress strength characteristics of sands with respect to the silt content. Silty sand was collected around the basin of Nak-Dong River and remolded in laboratory with the range of silt content 0~50% in sand located. As results, with the change of silt content cyclic shear stress ratio (CSR) at N=10 showed the maximum value at 5% and the minimum at 20% in all relative density. The development tendency of the pore water pressure analyzed by the relationship cyclic ratio and pore water pressure ratio is unrelated the change of CSR varying silt content. Comparing the results of the void ratio and skeleton void ratio after consolidation, CSR varying silt content was much affected by skeleton void ratio which is known to affect shear behavior of silty sand.

• Korean Journal of Cognitive Science
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• v.11 no.3_4
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• pp.95-105
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• 2000

본 논문은 재학습 없이도 검사를 반복함에 따라 기억수행이 증가하는 기억상승(hypermnesia) 현상에 작용하는 실험적 변인을 조사하였다. 그림목록이 시각적으로 제시된 실험 1과 단어목록이 청각적으로 제시된 실험 2 모두에서 기억상승의 중요한 요소인 기억회복(reminiscence)이 얻어졌다. 또한 반복검사를 실시할 때 주어지는 검사 지시문이 기억증가에 대한 장려를 할 때 얻어진 기억상승의 효과는 그렇지 않은 지시문이 주어진 통제 조건에 비하여 유의하게 컸다. 그러나 회상량의 차이가 기억회복량의 차이와 상관을 보이지는 않았다. 또한 기억회복은 발달적 차이와는 관계가 없는 것으로 나타났다.

• The Journal of Korean Academy of Prosthodontics
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• v.46 no.1
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• pp.42-52
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• 2008

Purpose: Resonance Frequency Analysis(RFA) technique can be used as an effective method in measuring the implant stability and documenting the clinical results. This technique also determines how stable the implant is before performing a prosthetic practice. Having become one the guidelines of the implant therapy whose final objective is the immediate loading, the $Osstell^{TM}$ mentor is giving a lot of information to the clinicians recently. In this communication, experiments were performed to investigate how reliable the measured ISQ values by $Osstell^{TM}$ mentor are, and to see if those are also stable even after sterilization. As five objectives: 1) How stable measured ISQ values after fixation $Smartpeg^{TM}s$ for 400 times. 2) How stable measured ISQ values after 'attach-detach'$Smartpeg^{TM}'s$ for 400 times. 3) How stable measured ISQ values after clinical sterilization methods. 4) How stable measured ISQ values after repeatedly sterilization in autoclave for 10 times. 5) What is the critical temperature which is lost the magnetism of $Smartpeg^{TM}$. Materials and Methods: Clinical sterilization methods(Autoclave sterilization, Dentistar sterilization, Ultra violet sterilization, Vacuum dry unit sterilization, Boiling water sterilization, combined $H_{2}O_{2}$ and Alcohol sterilization).$Smartpeg^{TM}s$. D3 Block bone($3{\times}9{\times}2cm$). Osstem implant(${\emptyset}4.1$-10mm).$Osstell^{TM}$ mentor. Individual experiment was used 8 number of $Smartpeg^{TM}s$ and they had measured to ISQ values of before experiment and after experiment. Results: 1. The measured ISQ values did not change after fixation $Smartpeg^{TM}s$ for 400 times. 2. There was no significant changes in the measured ISQ values of 'attach-detach $Smartpeg^{TM}s'$ for 400 times. 3. The measured ISQ values did not change after the usual clinical sterilization methods. 4. The measured ISQ values did not change after sterilization in autoclave for 10 times. 5. It was impossible to exactly measure the critical temperature which is lost the magnetism of $Smartpeg^{TM}s$. But, the results was resulted to lost its magnetism in higher temperature than $150^{\circ}C$/10 minute. Conclusion: The measured ISQ values showed insignificant differences in case of no changes in the magnetism of the $Smartpeg^{TM}s$. It seems that the $Smartpeg^{TM}s$ can be used repeatedly in every measurement if the original magnetisms of the $Smartpeg^{TM}s$ can be recognized. There seems to be no significant changes in the measured ISQ values of 'attach-detach $Smartpeg^{TM}s'$ only if the screw pitches were unimpaired. The clinical sterilization methods seems acceptable because the result was resulted to lost its magnetism in higher temperature than $150^{\circ}C$/10minute.

• Journal of the Korean Geotechnical Society
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• v.35 no.6
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• pp.39-48
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• 2019

This study investigated the lateral behavior of monopile embedded in the dry sand through cyclic lateral loading test using a centrifuge test. The sand sample for the experiment was the dry Jumunjin standard sand at 80% relative density and the friction angle of $38^{\circ}$. In the experimental procedure, firstly, it was determined the static lateral bearing capacity by performing the static lateral loading test to decide the cyclic load. This derived static lateral bearing capacity values of 30%, 50%, 80%, 120% were determined as the cyclic lateral load, and the number of cycle was performed 100 times. Through the results, the experiment cyclic p-y curve was calculated, and the cyclic p-y backbone curve by depth was derived using the derived maximum soil resistance point by the load. The initial slope at the same depth was underestimated than API (1987) p-y curves, and the ultimate soil resistance was overestimated than API (1987) p-y curves. In addition, the result of the comparison with the suggested dynamic p-y curve was that the suggested dynamic p-y curve was overestimated than the cyclic p-y backbone curve on the initial slope and soil resistance at the same depth. It is considered that the p-y curve should be applied differently depending on the loading conditions of the pile.

• Journal of the Korean Data and Information Science Society
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• v.7 no.1
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• pp.129-135
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• 1996

본 논문은 의뢰인의 Pilot Study를 상담한 것으로서 당뇨병 및 암 환자에게 효능이 있는 약으로 밝혀진 Steroid계통의 Methyl Prednisolone이 척수손상 환자에게 효능이 있는지를 알아보기 위해, 토끼를 실험대상으로 하여 얻은 반복측정자료를 분석하였다.

• Food Science and Industry
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• v.52 no.1
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• pp.52-59
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• 2019

The present article covers a brief introduction on how repeated exposure design can be utilized for developing new food products. A generic consumer taste test which measures consumer acceptance in one trial may have limitation in predicting long-term acceptability of a product. The article describes the changes in food preference and choice during the course of life from infants to elderly. Then, several possible theories that proposes to delineate the underlying mechanisms for acquiring the liking for food is introduced. The article also discusses general experimental design, case studies which adopted repeated exposure design, the limitations and rapid test methods to predict long-term acceptance.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.5 s.335
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• pp.39-46
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• 2005

It is well known the fact that turbo codes has better performance as the number of iteration and the interleaver size increases in the AWGN channel environment. However, as the number of iteration and the interleaver size are increased, it is required much delay and computation for iterative decoding. Therefore, it is important to devise an efficient criterion to stop the iteration process and prevent unnecessary computations and decoding delay. In this paper, it proposes the efficient iterative decoding stop criterion using the absolute mean value of LLR difference. It is verifying that the proposal iterative decoding stop criterion can be reduced the average iterative decoding number compared to conventional schemes with a negligible degradation of the error performance.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.955-958
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• 2001

본 논문에서는 비동기 CDMA 시스템에서 다중접속에 의한 간섭을 제거하는 역상관기 중에서 반복 연산을 사용하여 계산량을 개선한 second-order stationary 기반의 반복적 역상관기와 수렴특성에 대하여 이론적으로 분석하고 모의실험을 통하여 성능을 검증하였다. 먼저 반복적 역상관기에서 수렴특성을 결정하는 수렴 인자를 유도하고 가장 빠른 수렴 특성을 보장하는 최적의 수렴상수를 상관행렬의 최대 및 최소 고유값으로 나타낼 수 있음을 증명하였다. 또한 최적의 수렴 상수와 반복회수에 따른 BER이 기존의 역상관기와 비슷한 성능을 가짐을 보였다.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.773-776
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• 2001

열악한 전송 환경에서 고품질, 고신뢰성 통신을 지속적으로 하기 위해서 오류 정정 부호는 필수 적이다. 최근에 반복 복호를 통해 샤논의 채널 용량 한계에 근접하는 터보 부호와 LDPC부호가 가장 관심을 불러일으키고 있다. 반복 복호법은 성능 면에서는 우수해 지나 이에 따른 계산량 증가와 지연이 수반된다. 따라서 본 논문에서는 모의 실험을 통한 수신 데이터를 이용, SNR을 추정하여 LDPC 부호의 최대 반복 복호수에 따른 계산량과 지연을 효과적으로 줄일 수 있는 적응적 반복 복호수 설정 방식을 제안한다.