• Journal of the Korean Institute of Landscape Architecture
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• v.38 no.4
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• pp.45-53
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• 2010

This paper has attempted to propose a more progressive direction for U-environmental sculptures in a ubiquitous urban space in terms of usability, service, function and formative characteristics that enhance user satisfaction with these sculptures. For this, Media Pole, a U-environmental sculpture on Gangnam U-Street, has been examined. The results of this study are as follows: First, a study of user satisfaction was planned after establishing levels of satisfaction in terms of service, function and formative characteristics. In terms of satisfaction by the section of Media Pole, the public transportation map was the most influential in service while street culture and beauty of shape were critical in function and formative characteristics, respectively. In the relationship between satisfaction by section and overall satisfaction, furthermore, functional satisfaction had the biggest influence. Therefore, the development of human-centered functional factors which have pleasant and touching stories to facilitate communication with citizens are important in order to develop various Media Pole contents to enhance user satisfaction with the U-environmental sculpture and allow it evolve into a Gangnam landmark Since we are in the initial stage of a U-city, there are many problems that need to be addressed such as a lack of natural beauty, poor material quality of environmental sculptures, absence of storytelling, poor technology, lack of content, poor profitability and lack of means of social communication. In the end, the development of a comfortable, people-friendly space and U-environmental sculptures are needed in consideration of economic, social and cultural aspects instead of focusing on advanced technology only.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.1
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• pp.1-5
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• 2009

In this paper, a novel wideband crossed planar monopole antenna with the multiple resonance characteristics is proposed. The proposed monopole antenna can be designed by a wideband crossed planar monopole antenna with L-shaped slits. In order to generate multiple resonance characteristics on the proposed monopole antenna, the length of L-shaped slit and the number of L-shaped slits are determined at an interesting frequency. The proposed antenna having an omnidirectional radiation pattern and a high gain over the multiple resonance frequency bands, respectively, is suitable for a mobile antenna.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.8
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• pp.125-130
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• 2004

Various antennas have been developed to be used for UWB systems, However, Simultaneously meet omni-directional and low-VSWR requirements, essential for some applications such as UWB channel sounding. In this paper, we propose a novel wide band printed elliptic monopole antenna for UWB(Ultra wide Band). Wideband planar monopole disc antenna have been recently studied. The proposed antenna can cover m frequencies from 3.5GHz to 12GHz. it is determined from 10dB return loss. Antenna radiation pattern is omnidirectional at 3.5GHz - 10GHz. The antenna consists of the printed elliptical monopole disc with microstrip-line feed. Elliptic disc of antenna and ground height operate important to matching. The proposed antenna easy to construct UWB system.

• Journal of Elementary Mathematics Education in Korea
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• v.18 no.1
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• pp.63-81
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• 2014

Korean students have shown high achievements on the cognitive domain of mathematics in a range of international assessment tests. On the affective domain, however, significantly low achievements have been reported. Among the factors in the affective domain, this article discusses on the value of mathematics in the perspective of Michael Polanyi's philosophy, which centers personal knowledge and tacit knowing. Polanyi emphasizes abstractness and generalization in mathematics accompanied by intellectual beauty and passion. In his perspective, therefore, utilitarian aspects and usefulness of mathematics imparted through linguistic representations have limits in motivating students to learn mathematics. Students must be motivated from recognition of the value of mathematics formed through participating authentic mathematical problem solving activity with immersion, tension, confusion, passion, joy and the like.

• Defense and Technology
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• no.7 s.137
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• pp.42-57
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• 1990

1965년 싱가폴이 독립되었을때 싱가폴을 방어하기 위한 군대는 사실상 전혀없는 상태였다. 오늘날의 세계 추세와 같이 싱가폴도 자국을 보호하기 위해 급속히 군을 성장시켰다. 현재 싱가폴군은 자국의 영토를 보전할수 있는 현대화된 3군 체제를 유지하고 있다. 또한 싱가폴군은 외국 및 국내 방산업체 등을 통해 제작한 광범위한 무기체계로 장비되어 있다. 25년간 군을 운영해본 결과 싱가폴군은 그들의 임무를 충족하고 있고, 이러한 임무의 필요성과 조화되어 발전을 거듭하고 있다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.38-39
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• 2023

기존 등부표, 등명기 점검 시 사다리를 타고 상단에 올라가서 등명기를 점검하며, 너울성 파도 등으로 인하여 등부표가 기울어질 경우 추락사고가 발생할 수 있어 이를 예방하기 위해 엘리베이터 폴을 적용하여 등명기를 표체까지 하강시켜 안전하고 용이하게 점검할 수 있는 시스템 개발에 관한 것이다. 또한, 강철로 제작하는 표체를 탄소섬유로 제작하여 경량화하고 침추 무게, 투입 해상장비의 규모를 줄여 공사비를 절감하는 기대효과를 가질 수 있다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.6
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• pp.89-96
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• 1985

A pole-placement control of discrete, deterministic, single-input single-output nonmini-mum phase systems is considered using a model reference type approach. The proposed pole-placement controller is designed in the parameter form to make the transfer function of the controller equal to that of the reference model with only single variable polynomial S(q-1). The proposed adaptive pole-placement controllr is designed with the true system para-meters by applying the adaptation method to the proposed pole-placement controller.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.147-148
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• 2016

토템폴 구조는 브리지리스 부스트 역률보상회로 중에서도 저손실, 고효율, 저비용 그리고 낮은 전도 EMI의 특징으로 인해 많이 사용된다. 토템폴 구조의 역률보상 회로는 내부 다이오드의 역회복 문제로 인해 Si MOSFET을 이용한 전류연속모드 구동할 수 없어 전류 불연속 모드 혹은 임계 도통 모드로 동작시키는 것이 통상적이다. 본 논문에서는 역회복 문제를 해결해 전류연속모드 구동하기 위해 기존 Si MOSFET보다 낮은 역회복 전하(Qrr)와 역회복 시간(Trr)를 가지는 SiC MOSFET을 이용하여 토템폴 역률 보상 회로를 구현하고 이를 시뮬레이션과 실험을 통해 검증했다.

• 환경사랑
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• s.27
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• pp.12-13
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• 2001

스티로폴은 탁월한 충격 흡수력과 방수성, 단열성 등의 특성 때문에 제품 완충재나 포장 용기로 널리 애용되고 있다. 최근에는 성형과 착색이 용이해 방송용 소품, 가게의 디스플레이 소품, 또는 실물의 이미테이션으로도 용도가 넓혀지고 있다. 이렇게 널리 활용되고 있는 스티로폴의 다양한 용도에 대해 알아보자.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.12 s.91
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• pp.1190-1198
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• 2004

In this paper, meander-line planar monopole antenna mounted on PCS/IMT-2000/WLAN handset for SAR reduction is designed. Frequency characteristics and SAR value optimized with various design parameters are analyzed and designed. Designed internal monopole antenna mounted on the handset is simulated. The 1 g and 10 g peak average SARs of internal monopole antenna are 0.656 and 0.387 W/kg respectively. And internal monopole antenna and external monopole antenna attached on the handset are tested. As a result, internal monopole antenna 1 g and 10 g peak average SARs are 0.686 and 0.356 W/kg. And external monopole antenna's results are 1.33 and 0.812 W/kg, respectively. So internal monopole antenna has a about $50\%$ SAR reduction in comparison with external monopole antenna.