• Title, Summary, Keyword: Acquisition

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The Acquisition of Korean Number-Word Systems of Young Children (한국유아의 수단어 획득에 관한 연구)

  • Hong, Hae Kyung
    • Korean Journal of Child Studies
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    • v.11 no.2
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    • pp.5-23
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    • 1990
  • The purpose of this study was to investigate the acquisition of number-word systems of young children. Specifically, the acquisition of Korean Number-Words(KNW) was compared with the acquisition of Chinese-derived Number-Words(CNW). The subjects included 120 children aged 2:5 to 5:11. The subjects oral counting using the two number word systems were audiotaped. Two coders transcribed the tapes. The data were analyzed by content analysis with descriptive statistics. The findings of this study showed that the acquisition of KNW began from around age two and the acquisition of CNW from around age three. From then, the acquisition of the two number-word systems was parallel. The acquisition of number-words began from the age of 2 years, increased slowly to the age of 4. and then increased rapidly after the age of 5. Although KNW were acquired earlier than CNW, at around the age of 5 years the acquisition of CNW surpassed the acquisition of KNW. The acquisition of number words consists of four developmental levels: Level I: beginning of acquisition of traditional KNW only Level II: beginning of acquisition of CNW with extension of KNW Level III: parallel extension of the two number-word systems Level IV: superior acquisition of CNW. The major error through all stages in the sequence of number words was the omission of one number-word. Younger children produced errors of omission of one, two or three number-words, whereas older children produced errors of nonstandard number-words and repetition.

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RASE Acquisition Algorithm of Ultra Wideband System for Car Positioning and Traffic Light Control (차량 위치추적기반 교통신호등 제어용 UWB 시스템의 Acquisition 알고리즘 연구)

  • Hwang, In-Kwan;Park, Yun-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.10C
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    • pp.992-998
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    • 2005
  • In this paper, An Ultra Fast Acquisition Algorithm of low transmission rate ultra-wideband(UWB) systems for car positioning and traffic light controling is proposed. Since the acquisition algorithms for CDMA system are not fast enough to access the low transmission rate UWB systems, the new ultra fast acquisition scheme which can be implemented with low cost and simplified circuit is required. The proposed algorithm adopted the Recurrent Sequential Estimation scheme and trinomial M-sequence. Therefore, The proposed scheme can reduce the average acquisition time in $1\~3{\mu}sec$ with simple circuit, even for the UWB systems which use long pseudo-noise(PN) sequence and transmit low power below the FCC EIRP emission limits. The simulation results for the average acquisition time of the proposed scheme are compared with the ones of the existing acquisition schemes.

Systems Engineering Application of Imaginary WIG(Wing-In-Ground Effect) Ship Acquisition Project (가상 함정획득사업의 Systems Engineering 적용 (INCOSE SE Handbook ver. 3.1 중심으로))

  • Lee, Su Oek;Shin, Seung Chun;Choi, Nag Jun
    • Journal of the Korea Society of Systems Engineering
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    • v.5 no.1
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    • pp.57-65
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    • 2009
  • The purpose of Defense Acquisition Project is that the superior weapons validated needs and performance are supplied to military user with limited financial resources and time. The Warship Acquisition Project is not only like this, But also has special characteristics of long project period and first-constructed ship's operation employment. So, The Warship Acquisition Project need systematic and efficient procedure & management. And this paper researches System engineering application of imaginary WIG(Wing-In-Ground Effect) ship acquisition project based Systems Engineering Handbook ver.3.1 published by INCOSE, the lead of field. The Imaginary WIG(Wing-In-Ground Effect) ship acquisition project applied the four processes(technical project, Enterprise & Agreement, Enabling Systems), the basis of INCOSE Engineering Handbook ver.3.1, and the each process output compared with DAPA(Defense Acquisition Program Administration)'s warship acquisition procedure.

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An Evolutionary Acquisition Strategy for Defense Information Systems (국방정보시스템의 진화적 획득전략)

  • Cho, Sung-Rim;Sim, Seung-Bae;Kim, Sung-Tae;Jeong, Bong-Ju
    • Journal of Information Technology Services
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    • v.9 no.4
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    • pp.187-206
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    • 2010
  • Evolutionary acquisition is an alternative to the grand design acquisition approaches. It has activities to make it possible to develop quickly and respond flexibly to changing customer needs and technological opportunities. The Ministry of Defense adopted an evolutionary strategy to acquire defense information systems. but it does not work well always. We look at problems from aspects of acquisition system and project management. We benchmark successful cases for evolutionary acquisition strategy in the DoD, the pubic and the private sector. We suggest an evolutionary strategy for defense information systems. The evolutionary strategy in this study includes an evolutionary acquisition framework, an evolutionary acquisition process, and an evolutionary acquisition guideline for defense information systems. The evolutionary strategy can help to implement evolutionary acquisition process for defense information system, and the process can increase the success rate of projects.

An Efficient Assisted-GPS Acquisition Method in Weak Signal Environment (약 신호 환경에서 효율적인 A-GPS 초기동기 방법)

  • 박상현;이상정
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.1
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    • pp.96-102
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    • 2004
  • For sensitivity enhancement, the general assisted-GPS acquisition method adopts not only the coherent accumulation technique but also the non-coherent accumulation technique since the long coherent accumulation period increases the number of frequency search cells. But the non-coherent accumulation technique causes tile squaring loss, which is a dominant factor among the acquisition losses of assisted GPS dealing with weak GPS signals. This paper derives the squaring loss of the previous assisted-GPS acquisition method and proposes an assisted-GPS acquisition method for solving the problem of squaring loss in weak signal environment. In this paper, it is explained that the proposed assisted-GPS acquisition method prevents the squaring loss using a coupled coherent accumulation technique and the number of search cells of the proposed assisted-GPS acquisition method is much smaller than that of the previous assisted-GPS acquisition method. Finally, through the simulation by the GPS simulator, the acquisition success rate of the proposed assisted-GPS acquisition method is compared with that of the previous assisted-GPS acquisition method and the acquisition improvements are shown in weak signal environment.

Performance Analysis of Acquisition Methods for DGPS Reference Receiver under Noisy Environment

  • Park, Sang-Hyun;Cho, Deuk-Jae;Suh, Sang-Hyun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.107-112
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    • 2006
  • The previous acquisition method of GPS receiver for reference station adopts not only the coherent integration method but also the non-coherent integration method in order to enhance sensitivity under noisy environment. However, under noisy environment, the previous GPS signal acquisition method causes the non-coherent integration loss which is a major factor among losses that can be caused during GPS signal acquisition. The non-coherent integration loss also increases with the strength of the received noise. This paper has intention of analyzing the performance of the GPS signal acquisition method proposed to effectively enhance sensitivity of DGPS reference receiver under noisy environment. This paper presents that the proposed GPS signal acquisition method suppresses the non-coherent integration loss through post-processing simulation. Furthermore, with regard to the mean acquisition time, it is shown that the number of search cells of the proposed GPS signal acquisition method is much fewer than that of the previous GPS signal acquisition method.

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A Study on the Korean Language Acquisition of Children from Chinese Families in Korea: Focusing on Pronunciation and Vocabulary (재한중국인 가정 아동의 한국어 습득에 관한 연구 -발음과 어휘를 중심으로-)

  • Li, Yin
    • Journal of Korean language education
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    • v.29 no.3
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    • pp.165-196
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    • 2018
  • This study examined the language acquisition of children from Chinese families in Korea under the bilingual background of Korean and Chinese, focusing on pronunciation and vocabulary. First, in the analysis of pronunciation acquisition, children correctly realized the lenition, aspirated sound, glottalization, palatalization, nasalization, and liquidization while the realization of pronunciation rules for unfamiliar words was low. There were also errors caused when the application principles of pronunciation were not accurately understood or they were not partially acquired. Second, in the analysis of vocabulary acquisition, the acquisition of receptive vocabulary was in the order of verb, noun, and adjective while they clearly understood vocabulary used in the actual relationships with school, family, and peers. In the acquisition of productive vocabulary, they showed the 'meaning-centered principle' of learning the meaning of vocabulary first and then learning its form afterwards. The amount of study and exposure to Korean language had effects on the improvement of vocabulary. Even though this study focused on the errors and characteristics in the acquisition process of Korean pronunciation and vocabulary for children from Chinese families in Korea, it could not clearly find out which one would have greater effects on the acquisition of Korean language. However, lots of exchanges and experiences with surrounding environment and peer group had great effects on the language acquisition and language acquisition transfer of children.

A Methodology for Analyzing on the Correlation of Factors Affecting the Acquisition of Military Weapons Systems : Focused on Factor Analysis of Naval Ship Acquisition Delay Cases (국방무기체계 획득영향요인 상호관계 분석 : 함정획득지연 사례 및 요인 분석을 중심으로)

  • Hwang, Jeong-Oh;Oh, Hyun-Seung;Choi, Bong-Wan;Yim, Dong-Soon
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.43 no.4
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    • pp.48-58
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    • 2020
  • Naval weapons systems of the Republic of Korea are acquired through the Defense Planning Management System. Recently, acquisition of some naval ships have been delayed, and the causes of the delays have been recognized as inappropriate project management at the Execution Phase. However, we argue that the delay problem in naval ships acquisition should be approached, with due regard for the entire Defense Planning Management System. That is, We should try to investigate from Planning Phase to those of Programming, Budgeting and Execution Phases. Therefore, in this study, we investigated the actual cases of the delay in naval acquisition at all phases of the Defense Planning Management System. Based on the investigation, we tried to identify the naval ship Acquisition Delay Factors and find out the Weights of those factors. As the next step, we calculated the Influence Measures on the naval missions, including the Cost of Naval Capability Gap derived from the delays in acquisition of naval ships. As a final step, we calculated the Acquisition Delay Measures based on the interrelationship between the Acquisition Delay Factors and the Influence Measures. Then we evaluated and analyzed what the results stand for. Finally, we made suggestions for future improvement. The improvement suggestions we made for preventing delay in acquisition of naval ships in this study are as follows. First, we need a shift in perception. It is necessary to measure the Acquisition Delay Factors in acquiring naval ships and manage them from the Planning Phase. Second, resolution must be concerted efforts. All relevant agencies, not just a few, should work together to resolve the problems of acquisition delay. Third, analysis must be based on the accumulation of data. This allows the elaborating of naval ship Acquisition Delay Factors and Delay Measures. If this research method is applied to other military weapons systems in the future, we may be able to not just identify the Acquisition Delay Factors in acquisition of other military weapons systems, but also pursue improvement in those cases.

SE Case Study in Eagle Acquisition Program (독수리구매사업 시스템엔지니어링 적용사례)

  • Lee, Hi-Jang;Lee, Dong-Seok;Ham, Hyuck-Sang;Rho, Kyun-Hyup;Kwon, Young-Hoon
    • Journal of the Korea Society of Systems Engineering
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    • v.3 no.2
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    • pp.9-16
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    • 2007
  • To Manage the Defense Acquisition Process more efficiently, DAPA has looked over the applying SE process to the Eagle Acquisition Program. Based on comparing 'Requirement' with 'items suggested in the proposal' in RFP and analyzing the result by using Cradle, those items have been discovered with IPT, actualized and corrected. In addition, the computerized data base system makes easier to trace all changed and more efficiency to manage programs. Therefore, this study using SE in other acquisition program.

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Improvement of code acquisition time in DS/SS systems using a hybrid scheme (복합방식을 이용한 직접대역확산통신시스템의 코드획득 성능개선)

  • 조권도;김선영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.3
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    • pp.684-691
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    • 1996
  • Since the period of a spreading code in DS/SS communication systems is generally long, it is necessary to make the code acquisition as fast as possible. The code acquisition time can be sued as a measure to evaluate the performance of code acquisition systems. The search rate of serial search codee acquisition system used in the coventional CDMA cellular system is lower than that of the matched filter technique. In order to reduce the code acquisition time, this paper proposes hybrid code acquisition system composed filters combined with serial search blocks. In the proposed system, the matched filter sweeps possible code phases fast and the acquired phase information is verified by the serial search block. The mean and the variance of its acquisition time are calculated and compared with those of double dwell serial search system. The results indicate better performance of the proposed system by yielding its small vaues of the mean and the variance of code acquisition time.

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