• Electronics and Telecommunications Trends
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• v.23 no.3
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• pp.19-28
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• 2008

2007년 3월부터 WFA에서 시작된 "Wi-Fi CERTIFIED(TM)802.11n Draft 2.0" 인증을 통해 현재까지 180가지가 넘는 제품이 출시되고 있는 가운데 이러한 시장의 상황을 반영하듯 여러 매체를 통해 IEEE 802.11n이 2008년 핫이슈로 등장하고 있다. 하지만 차세대무선통신의 기술적인 로드맵을 선도하고 있는 ITU-R WP8F의 IMT-Advanced에서 요구하고 있는 보행시 1Gbps까지 가능하게 하는 기술을 2010년까지 제공한다는 측면에서는 IEEE 802.11n의 성능이 못 미치는 게 사실이며, 이러한 상황을 반영해 IEEE 802.11 내부에서 IEEE 802.11n 후속으로 보행시 Gbps급의 전송 속도를 지원하는 새로운 기술에 대한 표준화 작업에 대한 논의가 꾸준히 있어 왔고, 그 결과 2007년 5월 정식으로 이를 위한 Study Group이 만들어져 작업에 들어갔다. 본 고에서는 이러한 IEEE 802.11에서의 표준화 활동을 중심으로 차세대무선랜에 대한 응용분야, 관련 기술, 표준화 작업 내용에 대해 살펴보고자 한다.

• Digital Contents
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• no.8 s.147
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• pp.12-13
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• 2005

• Journal of Sericultural and Entomological Science
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• v.8
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• pp.51-62
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• 1968

This study was carried out to investigate the life cycle and the damage of Tricholyga sorbillans Wiedmann to silkworms(Bombyx mori L.). The results are summarized as follows. 1. This insect has 5 or 6 generations per year in Suwon area. 2. The egg, larval, and pupal stage are about 2, 8 and 18 days respectively. 3. The weather conditions considerably affect the life cycle, that is, the 3 rd generation is the shortest of all, lasting for 21 days and l4 hours, and the 5th generation is the longest for about 40 days. 4. The larvae come out of silkworm bodies, burrowing into the ground 3.5cm to 10.5cm in depth before changing into the pupae. 5. This insect does not overwinter as pupa, but seems to do as larva, parasiting on the field insects. 6. The damage of Tricholyga sorbillans Wiedmann to silkworm was 27.9％, it is so high that the silk worms could not be reared outside without a reasonable control method. 7. When the full-grown silkworm is parasited by one egg of these insects, there is not only enough possibility of spinning. but also without any effects of their larvae on the cocoon quality. 8. The damage of Tricholyga sorbillans Wiedmann throughout the country covers 6.36％ in spring, 4.09％ in fall, and 5.25％ yearly mean.

• The Journal of the Korea Contents Association
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• v.18 no.11
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• pp.146-160
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• 2018

The purspose of this study was to investigate on the TV drama of tvN from October to November of 2017, which was regarded as a well description of the current young generation's daily life and reality. In order to figure out how it depicted the young generation in TV drama, the authors tried to analyze it..Through this study, it was found that the rise of neo-liberalism changed their social and financial lives rapidly. It pushed the young generation to give up on dynamic challenges and dreams, and to search for normal and inactive life styles.It was also found that its myths and ideologies implied how much differently Korean young generation confronted big gaps between their cognitive realities and their actual realities. Furthermore, this study suggested that the necessity of full understanding why and how such Korean young generation sought for an unique life styles to overcome various difficulties in such chaotic societal situations.

• Korean journal of applied entomology
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• v.53 no.3
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• pp.295-299
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• 2014

Seasonal occurrences of three Tortricinae species were monitored at persimmon orchard in Changwon city ($35^{\circ}$09'18.16"N $128^{\circ}$34'43.63"E), Gyeongnam, Korea, by using sex attractant traps in 2012 and 2013. The two years of monitoring revealed that Adoxophyes honmai and Homona magnanima occurred four times a year, and Neocalyptis angustilineata did three times. Peak occurrence of A. honmai was recorded in mid-May, from early to mid-July, from late July to early August, and from mid- to late September for the generation, respectively. H. magnanima population peaked during mid- to late May, mid-July, from late August to early September, and from late September to mid-October for the generation, respectively. N. angustilineata showed three clear peaks from late May to early June, in late July, and from early to mid-September for the first, second, and third generation, respectively.

• Electronics and Telecommunications Trends
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• v.19 no.3 s.87
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• pp.84-95
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• 2004

홈 네트워크, 기업의 무선 네트워크 그리고 핫스폿 등과 같은 다양한 환경이 가능하면서 무선 LAN 기술 및 무선 LAN 제품에 대한 요구는 더욱더 증가하고 있으며, 기존 제품과의 호환성을 바탕으로 고속으로 무선 데이터 서비스를 지원할 수 있는 차세대 무선 LAN 기술에 대한 관심이 집중되고 있다. 본 논문에서는 현재 표준화가 진행중인 IEEE 802.11n의 차세대 무선 LAN 기술에 있어 주요하게 언급되고 있는 MAC 프로토콜 및 전송방식들에 대하여 소개한다. IEEE 802.11n은 IEEE 802.11e에서 논의중인 EDCA 및 HCCA를 기반으로 QoS를 보장하고 고속의 무선 LAN 서비스를 지원하기 위해 보다 개선된 MAC 프로토콜의 요구사항을 정의하여 물리계층의 관점에서 MIMO, spatial division multiplexing, space-time block coding 등과 같은 다중 안테나 방안을 고려하고 있다. 또한 주파수의 효율을 증가시키는 방식, 대역폭을 증가하는 방식 그리고 적응 변조를 적용하는 방식 등을 차세대 무선 LAN 전송 방식으로 논의하고 있다.

• Journal of the KSME
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• v.44 no.1
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• pp.40-41
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• 2004

이 글에서는 최근 관심이 고조되고 있는 실버산업의 현황과 차세대 성장동력 추진 계획에 나와 잇는 실버의료기기 기술에 대해 간략히 소개하고자 한다.

• Archives of design research
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• v.15 no.4
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• pp.25-32
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• 2002

It has gone that the age of making the products focusing on only the capacity or efficiency, We face the age that only the products which fit the sensitivity of customers. Now, customers attach importance to impressive design, convenience, and satisfaction as well as the quality, cost, and capacity of the products. Under the much plentiful life, it has a limit of exciting customer's interest to pursue the quality, cost and capacity, so we need new design development which can produce more different, better, and newer mood. Recently, past synchronism and standardization have collapsed according to the change of sense of value, customers make much account of their own sensitivity comparing with at any time in much information and visual stimulus, and they would like to purchase the products which satisfy their sensitivity as a way of their image creation and settlement of wants.

• Korean Journal of Plant Tissue Culture
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• v.25 no.2
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• pp.103-107
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• 1998

Tobacco proembryos were irradiated with 100 Gy of heavy-ion beams($^{14}\textrm{N}$, $^{20}\textrm{Ne}$: 135 Mev/u) after 24 to 96 hours of pollination as a mutagen and screened $\textrm{M}_{1}$ generation for morphological mutants and salt-tolerant plants. Morphological and physiological characteristics of the salt-tolerant plants derived from the irradiated proembryo are discussed in this report. Mutants irradiated proembryos with the beams after pollination produced various kinds of morphological variation. A total of 17 salt-tolerant plants were selected from tobacco cultivar (BY-4) by treatment with $^{14}\textrm{N}$ beam. Shapes of filament and pollen grain of most salt-tolerant plants were abnormal compared with non-irradiated wild type, and seeds weight and fertility obviously decreased. The germination rates of the several $\textrm{M}_{2}$ lines on the saline and the mannitol condition were higher than that of wild type.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.880-892
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• 2013

Stent thrombosis after successful drug-eluting stent(DES) implantation has been reported in around 1% of patients in clinical trials. However, the increased risk of ST associated with DES remains a matter of concern. From 1 June 2003 to 30 June 2013, we investigated clinical characteristics, in-hospital outcomes in 10,273 patients who underwent percutaneous coronary intervention in the Heart Center of CNUH. Overall incidence of ST was 1.30% (134 patients). The incidence of ST according to the stent generations and the timing of ST (n=total, early vs. late vs. very late) were 0.79% (n=81, 26 vs. 12 vs. 43) in first-generation, 0.38% (n=39, 21 vs. 9 vs. 9) in second-generation and 0.14% (n=14, 8 vs 3 vs. 3) in third-generation, (p=0.70). The mortality from ST was significantly higher in early ST group compared to the late and very late ST groups (18.2% vs. 8.3% vs. 3.6%, p=0.042). Overall incidence of ST after DES implantation was 1.30% (134 patients). The in-hospital mortality was significantly higher in early ST group compared to the late and very late ST groups.