• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.136-137
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• 2003

동중국해로부터 동해(일본해)에 분포역을 가지는 대마난류계 꽁치자원은 해황에 따라 체장계급군이 추월 회류를 하는 모델이 개발되었다(Gong et al., 1983, 1985). 한편, 이 꽁치어군의 분포 밀도 및 어획량은 동해의 동측(일본측)보다 서측(한반도측)에서 높은 이유를 생산성, 해양구조 및 군집효과에 관련된다고 암시하였으나(공 과 이, 2001), 이 자원의 구조에 미치는 해황의 영향은 확실하게 설명되지 않았다. (중략)

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.8C
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• pp.758-766
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• 2007

High peak-to-average power ratio(PAPR) is one of serious problems in the orthogonal frequency division multiplexing(OFDM) systems. This paper proposes a PAPR reduction technique for limited feedback multiple input multiple output(MIMO) OFDM systems. The proposed method is based on the null space of the MIMO channel where a dummy signal is made in the channel's null space and then, subtracted from the original signal to reduce the PAPR. First, we show that a problem occurs when the existing method is directly applied to limited feedback MIMO case. Then, a weight function for the dummy signal is proposed to mitigate the degradation of the receiver performance while still reducing PAPR significantly. The weight function is derived from a constrained nonlinear optimization problem to minimize the mean square error between the received signal and its ideal signal. Simulation results shows that the proposed technique provides about 2.5dB PAPR reduction with 0.2dB bit-error probability loss.

• Journal of the Korean Chemical Society
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• v.48 no.3
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• pp.311-321
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• 2004

This study was conducted to find out how many secondary school science teachers are aware and ready to implement new science curriculum as well as its revision process. For the purpose of this study, teachers had been asked to fill in a questionnaire. The results showed that teachers' overall understanding and readiness was low and that the implementation of new curriculum was a burden to a large number of teachers. Some teachers even expressed a negative opinion. Furthermore, it turned out that teachers didn't have an important role in revising the curriculum as a only small number of teachers participated. So, the second questionnaire and interviews were provided in order to ask for various opinions as to how new science curriculum should be communicated to schools and when school teachers should participate in the revision of curriculum, along with their role and participation methods.

• Korean journal of communication and information
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• v.18
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• pp.269-303
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• 2002

This article presents a historical account of media role in the transition and consolidation period of democracy. Despite the assumption that media plays a important role in the construction of democracy, it is less clear how the media can affect the process of political change itself. This article seeks to answer some of these question, based on the Mill's macro-social comparative 'method of difference' of Korea and Spain. It is widely agreed that both states achieve democracy through transaction from above(pacts). Media role, however, differs significantly in accordance with authoritarian legacies and civic representativeness of the pacts. Whereas Korean dailies is deepening given market oligopoly and prior practices after democratization, Spain dailies market entirely changed in both structural and spiritual respects. As a result, Korean dailies substantially lacks in civic representativeness as before, contrary to Spain. Spain television settled a sort of the external pluralism. Korean television is pursuing the BBC type of internal pluralism. In Korea, television is more commercial than Spain. Consequently, Spain media serve the consolidation of democracy more than Korea on the whole.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.2 s.105
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• pp.184-192
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• 2006

Synthetic Aperture Radars(SAR) are used mainly for high-resolution imaging of the terrain. This paper describes the $16{\times}16$ array antenna designed for an X-band, automobile-based SAR(AutoSAR) system. This antenna has the structure of several layers such as radome, radiators, slots, feed network, and honeycomb cores. Each layer is adhesively bonded to meet different combination of structural and electrical design requirements. Using the Strip-Slot-Foam-Inverted-Patch(SSFIP) structure and honeycomb cores, a wide bandwidth and a structural hardness were achieved. Measurement results were compared with simulation results. It was observed that this antenna had a bandwidth of 1.7 GHz, side-lobe levels of less than -20 dB, half-power beamwidth of $5^{\circ}$ and $5^{\circ}$, and gains of 25.0 dBi. The observed results show that the designed array antenna will be applicable to the wideband SAR system.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2005.11a
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• pp.317-322
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• 2005

Synthetic Aperture Radars(SAR) are used mainly for high-resolution imaging of the terrain. This paper describes the 16$\times$16 array antenna designed for an X-band, automobile-based SAR(AutoSAR) system. This antenna has the structure of several layers such as radome, radiators, slots, feed network, and honeycomb cores. Each layer is adhesively bonded to meet different combination of structural and electrical design requirements. Using the Strip-Slot-Foam-Inverted-Patch(SSFIP) structure and dogbone slots, a wide bandwidth and a structural hardness were achieved. Measurement results were compared with simulation results. It was observed that the SAR antenna had a bandwidth of 1.7 GHz, side-lobe levels of less than -20 dB, half-power beamwidth of 5$^{\circ}$, and gains of 25.0 dBi. The observed results show that the designed array antenna is suitable for the broadband AutoSAR system.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.300-303
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• 2012

기존의 디지털미디어에 관한 논의들이 지나치게 디지털기술의 생산성과 효율성에만 주목하면서 긍정적인 면도 많지만 역으로 디지털 치매 등과 같은 문제점을 내포하고 있다. 다시 말해 스마트 폰 등에 저장되어 있는 전화번호 및 메모 등이 우리에게 편리함이라는 혜택을 주고는 있지만 반대로 조그마한 것이라도 쉽게 기억해 내지 못하는 역효과가 사회적 이슈로 대두되고 있다. 이를 위해 본 논문에서는 디지털미디어 이용자들의 위험성과 문제점 및 해결방안에 대한 의견 등 최근 가장 주목받는 미디어로서 대부분 디지털매체를 포괄하는 융합미디어이기 때문에 다양한 위험요인들이 집결되어있는 특징을 여러 디지털기기사용자를 분석대상으로 삼아 이러한 유형들에 대한 사례들 그리고 이러한 유형들에 대한 예방 및 사후대응방안에 대한 의견을 확인하고 이를 해결하기 위한 방안을 제시하고자 한다.

• Journal of Korean Port Research
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• v.13 no.2
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• pp.215-232
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• 1999

Privatisation has emerged within the past few decades as one of the most significant challenges to public ports and their governments throughout the world. More than forty countries have committed to some form of port privatisation thus far and they will quite likely be joined by dozens more by the turn of the century. A decision to privatise ports can be driven by a variety of forces. The most obvious is to relieve a financially strapped government by turning to the private sector for an infusion of capital required to modernise and sustain port operations, or to bolster the national treasury. Inefficient and costly port operations can seriously impair the competitiveness of a nation’s export industries and artificially raise the cost and thus constrain the availability of imported goods. Privatisation in certain circumstances therefore holds the promise of stimulating economic growth particularly for those whose livelihood depends directly upon port activity and trade. The main objective of this paper is first of all, to introduce a variety of methods of port privatisation after reviewing the reason why port facilities should be privatised. This paper also aims to make some proposals with which a port privatisation process in Korea can be improved after summarising the present Terminal Operating Company(TOC) system propelled by Ministry of Maritime Affairs and Fisheries.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.36-46
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• 2015

The purpose of this study is to investigate the characteristics of diverse contents service of EBS providing on the multi-platform in the era of smart media. This study investigated contents service of EBS in order to seek and suggest EBS's competitiveness in the era of smart media environment. As a result, EBS is providing real-time service, VOD and e-learning, but its current contents service is concentrated on providing e-learning service. This study recommended that EBS need to reinforce contents suitable for various multi-platform uses. It also suggested EBS need to cooperate with diverse webs service and SNS service in order to widen openness of its platform, and to provide not only diverse contents, but also applications by offering mobile and on-demand contents and services. Finally, this study proposed that EBS is needed to move towards a more public and comprehensive media portal.

• (The)Korea Educational Review
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• v.24 no.2
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• pp.51-79
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• 2018

The purpose of this study is to critically reflect on whether the higher education(HE) restructuring & funding policy proposed by the Moon administration can properly tackle the structural problems confronting Korean HE system. The three major structural problems having entrenched during the rapid expansion of Korean HE system since 1945 can be identified as (1) a 'high cost - low efficiency system' based heavily on 4-year private universities, (2) lack of clear distinction of the roles and connection among different types of higher education institutions (HEIs), and (3) provider-oriented education system and culture seemingly still being widespread at Korean HEIs. This study analyzed the validity of Moon Administration's HE restructuring and funding policy from both a macro- and micro-perspective. From a macro-perspective, this study raised concerns regarding the projects to nurture a national university and a government-dependent private university which will require huge public money. In terms of both the feasibility to secure enough funds and the validity of the proposed policy measures in the existence of unclear roles between public and private HEIs in Korea, this study criticized these policies and proposed, as an alternative policy measure, a low-cost and flexibly operated HEIs such as a government-dependent polytechnic, and a measure to increase connection between different types of HEIs. From a micro perspective, this study suggested, based on 'the expanded principal-agent theory (Waterman & Meier, 1998)', that it would be considered to introduce a more flexible approach in designing the level of government intervention depending upon the maturity of quality assurance procedure at individual universities and the level of goal conflicts between government and individual university.