• Bulletin of the Korean Space Science Society
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• 2001.11a
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• pp.63-63
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• 2001

• Journal of Bio-Environment Control
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• v.6 no.3
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• pp.143-150
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• 1997

In order to produce young leaf of butterbur(Petasites japoflicus MAX.) in early spring, the planting date and relationship between abscisic acid(ABA) content and dormancy were investigated. Under open field condition, the dormancy of rootstock was initiated in the beginning of October, was the deepest in the middle of November and was completely broken in the end of December. When those periods were converted by the low accumulation hour below 5$^{\circ}C$, 900 hours were required approximately. This means that the rootstock needs for dormant breaking necessitates under the low temperature. In relationship between growing period and ABA content, the ABA in root-stock did not exist during maximum growing period, from April to September. This means that the ABA together with other substances in rootstock can be transferred to the shoot part with sprouting. While shoot part withered by decreacing the open field temperature since October, the ABA intiated to exist in rootstock. This means that the ABA in the shoot part can be transferred to the rootstock part. Therefore, it was concluded that the ABA which has been known that inhibiting growth and inducing dormancy was closely related with dormancy of rootstock.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.164-175
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• 2014

The purpose of this study is to confirm violence regulation of television. Television programs that infringed the standards of violence and were sanctioned, were analyzed in terms of broadcasting violence standards and the level of sanction imposed, according to network and cable television. The results show that both network and cable television were mainly imposed on sanction of caution and recommendation. And violation of article 36 was most. But there were differences in violation of articles 36, 39, 51 between network and cable television.

• Journal of Satellite, Information and Communications
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• v.5 no.2
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• pp.57-63
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• 2010

Many efficient frequency sharing methods are issued in present because of increasing users with various wireless communication terminals. In the satellite communications, the service coverage is generally very wide so frequency sharing with terrestrial system is essentially needed, and the research is progressing dynamically related on this frequency sharing method. But if we adopt the terrestrial system which is commonly used, it can't avoid the interference from terrestrial service to satellite service. Therefore, this paper will introduce methods for reducing the interference from terrestrial station to earth station using cognitive radio system Satellite system is guaranteed with decreasing interference from terrestrial stations using Genetic Algorithm based power control method. Furthermore, terrestrial systems can have increased QoS because the frequency reuse factor in proposed method is higher than existing methods.

• Journal of Ginseng Research
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• v.11 no.1
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• pp.46-55
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• 1987

The regression line was used to predict ginseng root yield from characters of aerial parts, stem diameter, leaf length and width, and degrees of missing plants per unit area. The rates of fitness of predicted yield on practical yield investigated in field were high. Especially, theoretical yield calculated by the size of stem diameter was a good fit. Therefore, a line regression appeared to be a satisfactory fit.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.77-80
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• 2012

KBS는 세계 최초로 지상파 4K UHDTV(Ultra-High Definition Television) 실험방송을 9일 시작하였다. UHDTV 방송기술은 차세대 방송기술로 주목받으면서 선진국들간 주도권 경쟁이 치열하다. KBS에서는 지상파 4사 UHDTV 추진 협약에 따라서 KBS관악산UHDTV실험국 준공을 완료하고 현재 4K-UHDTV 신호를 송출하고 있으며, KBS연구동 기술연구소에 수신점을 마련하고 24시간 수신 중에 있다. 본 논문에서는 실험방송 송수신 전송시스템 개요에 대해서 알아본 후, 4K-UHDTV가 요구하는 최소 비트율 30Mbps을 만족하기 위한 최소 ToV(Threshold of Visibility) 값과 그 때의 전송 파라미터 구성에 대해서 살펴본다.

• Annual Conference of KIPS
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• 2012.11a
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• pp.1200-1202
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• 2012

미래 전장에서 다수의 지상로봇들이 획득한 표적정보는 원격에 위치한 통제장치로 실시간 전송된다. 통제장치는 정찰영상과 디지털 지도위에 지상로봇들의 현재 동작 상태를 표시한다. 본 논문은 다수의 지상로봇들로부터 동일 표적에 대한 위치 정보가 수신될 경우 이에 대한 융합처리 방안을 제안한다. 이러한 융합처리를 통해 표적위치 정확도를 개선할 수 있으며, 이동 경로 추정을 통해 표적의 초기 탐지시간을 단축할 수 있다.

• Korean Architects
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• s.504
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• pp.73-81
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• 2011

지구라는 한정된 자원을 사용하며 살아가는 인류에게 지구의 온난화와 에너지원의 고갈 등은 인류의 미래를 보장 할 수 없는 단계에 이르렀다. 몇 번의 오일쇼크와 오존층의 파괴 등 지구환경의 변화는 이제 남의 일이 아니다. 세계적인 관심사가 이제야 친환경으로 모아지는 것은 오히려 늦은 감이 있다. 건축계에서도 친환경 및 지속가능한 건축이란 명제가 화두가 된지도 몇 해가 지났다. 그러나 이직도 구체적인 실천이 미흡한 것도 사실이다. 그 이유로는 막연한 개념과 건축에의 구체적인 적용방법의 이해 부족에서 기인한 점도 적지 않다고 본다. 이에 "건축사"지에서는 우리협회의 "친환경건축설계아카데미 건축강좌"의 내용의 일부를 선정하여 요약 연재함으로써 친환경건축에 대한 회원들의 이해를 돕고, 친환경 건축이 활성화 될 수 있도록 하고자 한다. 실무에 도움이 될 수 있었으면 하는 바람이다.

• Journal of Korean Society of Forest Science
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• v.111 no.4
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• pp.473-481
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• 2022

Environment-friendly harvesting is practiced to maintain ecosystem, landscape, and forest protection functions. The present study was conducted at Simgok-ri, Sinbuk-myeon, Pocheon, Gyeonngi-do, where a 41-50-year-old Japanese larch forest was harvested in an environment-friendly manner from 2017 to 2019. The dynamics of organic matter in this forest were investigated at three years after the harvest. Specifically, organic matter content was measured on the forest floor and in overstory biomass, litterfall, and soil up to 30 cm in depth from June 2020 to January 2021. Owing to the harvest, the amount of overstory biomass of the Japanese larch stands decreased from 142.22 to 44.20 t ha^-1. On the forest floor, the amount of organic matter was 32.87 t ha^-1 in the control plots and 23.34 t ha^-1 in the harvest plots. Annual litterfall was 4.43 t ha^-1 yr^-1 in the control plots and 1.16 t ha^-1 yr^-1 in the harvest plots. Soil bulk density in the B horizon was 0.97 g cm^-3 in the control plots and 1.06 g cm^-3 i n the harvest plots. Soil organic matter content was 11.5% in the control plots and 12.8% in the harvest plots. The total amount of soil organic matter did not differ significantly between the control plots (245.21 t ha^-1) and harvest plots (263.92 t ha^-1), although the amount of soil organic matter tended to be higher in the harvest plots. The total amount of organic matter in the forest was estimated to be 406.48 t ha^-1 in the control plots and 338.21 t ha^-1 in the harvest plots. In the harvest plots, the ratio of aboveground organic matter decreased to 13.1% and soil organic matter increased to 78.0%, indicating that the distribution of organic matter changed significantly in these plots. Overall, the carbon accumulated in aboveground biomass was substantially reduced by environment-friendly harvesting, whereas the soil carbon level increased, which played a role in mitigating the reduction of system carbon in the forest. These results highlight one possible resolution for forest management in terms of coping with climate change. However, given that only three years of environment-friendly harvesting data were analyzed, further research on the dynamics of organic matter and tree growth is needed.

• Journal of IKEEE
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• v.28 no.4
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• pp.619-626
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• 2024

This study proposes a communication planning algorithm to support unmanned ground vehicle(UGV) in maintaining communication connectivity during reconnaissance missions, even in dynamically changing environments. The proposed algorithm utilizes input data such as mission routes, the number of UGVs, and the maximum allowable communication disconnection distance to preemptively identify potential communication disconnections along the mission path. It then determines the optimal relay points for UGVs, establishing a communication plan that ensures mission success. Simulation results demonstrate that the algorithm performs effectively in complex environments, such as mountainous terrains in South Korea. These findings confirm its capability to provide optimal communication plans under resource-constrained and diverse terrain conditions, ultimately offering practical assistance to operators in decision-making.