• 영어어문교육
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• 제12권2호
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• pp.177-194
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• 2006

Snyder (2001) proposes that complex predicate constructions are interrelated by shared dependence on a single parameter, the Compounding Parameter, and that the global application of the parameter explains the simultaneous acquisition of the complex predicate constructions and N-N compounds in L1 acquisition of English. Slabakova (2002) examined the status of the Compounding Parameter in the acquisition of L2 Spanish by instructed learners. The result of the study, however, was not compatible with the prediction of the Compounding Parameter, possibly due to the availability of negative evidence in the input. Building upon Slabakova's study, this paper examines the status of the Compounding Parameter in naturalistic L2 learning. It is shown that the naturalistic L2 learners do not acquire the complex predicate constructions and N-N compounds concurrently contra to the prediction of the Compounding Parameter. It is suggested that the validity of the Compounding Parameter as a theoretical construct be reconsidered.

• Journal of Astronomy and Space Sciences
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• 제36권2호
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• pp.97-103
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• 2019

An automated signal-acquisition method for the NASA's space geodesy satellite laser ranging (SGSLR) system is described as a selection of two system parameters with specified probabilities. These parameters are the correlation parameter: the minimum received pulse number for a signal-acquisition and the frame time: the minimum time for the correlation parameter. The probabilities specified are the signal-detection and false-acquisition probabilities to distinguish signals from background noise. The steps of parameter selection are finding the minimum set of values by fitting a curve and performing a graph-domain approximation. However, this selection method is inefficient, not only because of repetition of the entire process if any performance values change, such as the signal and noise count rate, but also because this method is dependent upon system specifications and environmental conditions. Moreover, computation is complicated and graph-domain approximation can introduce inaccuracy. In this study, a new method is proposed to select the parameters via a conditional equation derived from characteristics of the signal-detection and false-acquisition probabilities. The results show that this method yields better efficiency and robustness against changing performance values with simplicity and accuracy and can be easily applied to other satellite laser ranging (SLR) systems.

• 영어어문교육
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• 제5호
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• pp.219-247
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• 1999

The purpose of this paper is to examine how Korean learners of English reset the "prodrop" parameter of Korean into "non-prodrop" parameter of English in the process of English acquisition. An experiment was conducted to 45 Korean learners of English on the prodrop phenomenon, namely on the null referential or null nonreferential subject, and subject-verb agreement by way of grammatical judgment. The results of the experiment are as follows: First, L2 learners follow the parameter of L1, and then reset the parameter of L2 regardless of the parameter of L1 as their L2 abilities advance. Thus, this study provides further support for the hypothesis that universal grammar is available via L1. Second, the referential subject is, at first, easier to acquire than nonreferential subject, and the triggering fact for the switch from [+prodrop] to [-prodrop] was the use of nonreferential subjects. Third, 3rd person agreement has no connection with the acquisition of the prodrop parameter as a result of subject-verb agreement. Therefore, these results indicate that verb agreement is not a trigger for the recognition of the obligatory subject.

• 한국통신학회논문지
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• 제28권7C호
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• pp.688-695
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• 2003

본 논문에서는, 적응형 필터를 이용한 동기획득 시스템을 실제 환경에 효과적으로 사용하기 위해 두 가지 알고리즘을 제안한다. 첫째, 하나의 필터를 여러 개의 부 필터로 나누어 적응시키는 병렬 부필터 탐색 구조를 제시하여 실제 환경에서 요구되는 빠른 동기 획득 성능을 얻는다. 둘째, 적응 파라미터들을 수신 신호의 전력에 따라 조절해주는 파라미터 결정기법을 제안하여 이상적인 성능에서 큰 열화 없이 실제 환경에서 효율적으로 동작 가능하도록 한다. 제안된 시스템에 대해 통계적인 분석을 수행하고 모의 실험을 통해 평균 동기 획득 시간 성능을 검증한다. 병렬 부필터 탐색 구조를 적용한 시스템은 기존의 전체 필터 탐색 구조에 비해 16탭에서 1∼l.5dB, 64탭에서 5∼6dB의 성능 이득을 보이며, 제안된 파라미터 결정기법을 적용한 시스템은 16탭과 32탭에서 이상적인 성능에서 약 1∼2.5dB 정도의 열화만으로 실제 환경에서 효과적으로 동작함을 보여준다.

• ETRI Journal
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• 제29권1호
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• pp.1-7
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• 2007

In this paper, we analyze the performance of double-dwell hybrid initial acquisition in a direct sequence ultra-wideband (DS-UWB) system via detection, miss, false alarm probabilities, and mean acquisition time. In the analysis, we consider the effect of the acquisition sequence as well as the deployment scenario of the abundant multipath components over small coverage of the piconet in the DS-UWB system. Based on the simulation, we obtain various performance measures for the mean acquisition time by varying parameters such as the total number of hypotheses to be searched, subgroup size, and dwell time. We thereupon suggest the optimum parameter set for the initial acquisition in the DS-UWB system.

• 한국통신학회논문지
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• 제31권7A호
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• pp.696-701
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• 2006

In this paper, we analyze the performance of double-dwell hybrid initial acquisition in DS-UWB system via detection, miss, false alarm probabilities and mean acquisition time. In the analysis, we consider the effect of the acquisition sequence, and deployment scenario of the abundant multipath components over the small coverage of the piconet in DS-UWB system. Based on the simulation, we obtain various performance on the mean acquisition time by varying the parameters, such as the total number of hypotheses to be searched, subgroup size, and dwell time. Then, we suggest the optimum parameter set for the initial acquisition in DS-UWB system.

• 영어어문교육
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• 제3호
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• pp.55-70
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• 1997

This paper aims at showing firstly, that the parameterized Universal Grammar is also accessible in second language acquisition based on the data found in the English Agreement acquisition by Korean speakers and secondly, that the theoretical claim that the acquisition of Agreement is related to the Subject Drop phenomenon can be supported by the second language acquisition data. The functional category AGRP which is crucial here can be parameterized according to its features with Korean of - Agr and English of + Agr. Two groups of 40 each were tested and the result shows that the parameter resetting is possible in terms of the Agreement feature. In addition to Agreement test, three more tests for the distribution of Subject Drop, Subject Raising and NPI (Negative Polarity Items) were conducted in order to find the correlation among those grammatical phenomena. The result is that the acquisition of Agreement and the Subject Drop possibility are correlated but that they are not related to the obligatory Subject Raising process. Finally, NPI distribution test which is supposedly related to the Subject Raising turned out to carry little information since the average grades from both groups were very low.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2012년도 제38회 춘계학술대회논문집
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• pp.416-423
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• 2012

액체추진제 공급시스템의 액체포집장치는 추진기관으로 기포가 유입되는 것을 방지하는데 사용한다. 액체포집장치는 차단막의 미세 구멍의 모세관 효과를 이용하여 추진기관에 순수 액체만을 공급한다. 기포점은 액체포집장치의 설계에서 가장 중요한 설계변수이다. 본 논문에서는 문헌조사를 통해 액체포집장치의 성능에 영향을 미치는 변수들을 식별하고 기포점 측정 시험 장치를 구성하였다.

• 한국인터넷방송통신학회논문지
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• 제11권5호
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• pp.145-150
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• 2011

본 논문은 신체의 운동 이후에 자세의 움직임 변화를 주고, 다중파라미터를 이용하여 자세균형의 변화를 나타내는 시스템이다. 신체에 동작을 주어 자세 균형의 변화된 신호를 시스템에서 측정하고, 이를 분석하여 자세균형의 변화상태를 나타냈다. 신체의 자세변화는 머리와 상체를 움직여서 변화를 주었고, 자세 변화로 발생된 신호는 파라미터의 형태로 구성하여 측정할 수 있도록 하는 시스템으로 구성하였다. 데이터 신호는 데이터 획득 장치를 통하여 얻고, 신호 전달 과정에서 신호를 분석하여 논리적으로 분석하여 자세에 대한 평가를 할 수 있도록 조정하였다. 측정파라미터의 항목은 시각(Vision), 전정기관(Vestibular), 체성감각(Somatosensory), 중추신경계(CNS)이고, 측정파라미터의 평가는 안정성(Stability)으로 확인하였다. 본연구의 결과로 운동부하에 따른 인체의 자세변화에 따른 신체의 변화 상태를 분석할 수 있는 시스템을 구성 할 수 있음을 확인하고, 다양한 신체적 파라미터를 통한 모니터링 기능을 갖춘 시스템관리가 형성 될 것으로 예상한다.

• Biomolecules & Therapeutics
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• 제8권1호
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• pp.63-72
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• 2000

We intended to show some basic requirements for spectrum analysis of electroencephalogram (EEG) by visualizing the differences of the results according to different values of some parameters for analysis. Spectrum analysis is the most popular technique applied for the quantitative analysis of the electroen- cephalographic signals. Each step from signal acquisition through spectrum analysis to presentation of parameters was examined with providing some different values of parameters. The steps are:(1) signal acquisition; (2) spectrum analysis; (3) parameter extractions; and (4) presentation of results. In the step of signal acquisition, filtering and amplification of signal should be considered and sampling rate for analog-to-digital conversion is two-time faster than highest frequency component of signal. For the spectrum analysis, the length of signal or epoch size transformed to a function on frequency domain by courier transform is important. Win dowing method applied for the pre-processing before the analysis should be considered for reducing leakage problem. In the step of parameter extraction, data reduction has to be considered so that statistical comparison can be used in appropriate number of parameters. Generally, the log of power of all bands is derived from the spectrum. For good visualization and quantitative evaluation of time course of the parameters are presented in chronospectrogram.