• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.352-352
• /
• 2023

본 연구에서는 제주도권역 강우관측소의 고도별 공간분포의 적정성을 평가하기 위한 방안으로 고도별 강우관측소의 최근린지수(Nearest Neighbor Index, NNI)를 산정하고 현재 강우관측소 공간분포의 적정성을 평가하였다. 또한, 제주도권역을 고도에 따라 등면적으로 구분하고, 고도마다 상이한 지형조건을 고려하기 위해 등면적으로 구분된 각 강우관측소의 최대 NNI를 최적화 기법의 하나인 화음탐색법(Harmony Search, HS)을 이용하여 산정하였다. 이와같이 현재 강우관측소설치위치를 기준으로 산정한 NNI와 HS를 이용하여 산정한 최대 NNI의 차이를 바탕으로 지형적인 특성을 고려한 제주도권역 강우관측소 분포를 비교·검토하였다. 그 결과 고도가 높아짐에 따라 강우관측소의 개수가 낮은 고도에 비해 상대적으로 적어 관측소 밀도가 작은 것으로 산정되었다. 향후 제주도권역 강우관측소의 지형적인 특성을 반영한다면 보다 효율적인 제주도권역 강우량관측이 가능할 것으로 판단된다.

• Journal of Korean Society of Forest Science
• /
• v.61 no.1
• /
• pp.60-68
• /
• 1983

Ever since the day of pre-modernized society where the farming skill had been in the stagnant condition, the common farmwoodlands have been utilized in common (collectivelly) by villagers in order to harvest farmwoodlands and fuelwoods. Later, during the process of modernization, most of the common farmwoodlands were transferred into national or public forests by the administrative enforcement, but there were still various types of village (common) forests such as the common forests owned by joint owners, village block associations, village forest productive societies, Village Forestry Association(V.F.A.), and the national or public forests leased to V.F.A. As Village Forestry Association is organized with a few villages, each of common forests ow nod to the villages is obliged to be diversely controlled by other managers than the chief of V.F.A. Therefore, it is to be desired that the control of common forests should be under Gun Forestry Association Union. While the rate of the use of common forests for fuelwoods and cemetery has been considerably high, villagers wish to promote the timber forest establishment through the collective management by their improved farming skills and economical situations. In these present circumstances the village forest productive societies should be guided to work in closer cooperation with Gun Forestry Association Union. Since the management of common forests is still extensive, it still remains in the semi-management condition under which we can not find any management plan or measure to control forest damage. Especially the small area common forests should have appropriate size for the joint management. This will promote the forest productivity through the lease for reforestation of disposable national forests or public county forests and the contracts for profit sharing. Today owing to increasing forest value, frequent dispute has occurred on the common right telated to the village forests and rationalization of forest management has been disregarded. If a necessary measure were taken to control the dispute such as transferring the registeration right of ownership to the village forest productive society, the confidence of local inhabitants can be regained and the productivity of forests can be naturally increased.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2008.11a
• /
• pp.186-190
• /
• 2008

낙동강 수계에 존재하는 자연습지의 효과적인 비점오염저감기능에 착안하여 자연습지를 참조습지로 삼아 비점오염원 저감을 위한 인공습지를 조성하였다. 참조습지 조사결과, 면적은 약 83,371 m$^2$, 평균수심 0.97(0.5 $\sim$ 1.9)m, 체적은 80,870 m$^3$이며, 습지면적이 배수구역면적의 6 %로 나타났다. 식생은 부엽 및 침수식물이 우점하고 있으며 강우 시에 유량이 집중되었다. 74.5 mm강우 시 습지로 유입된 유량을 기준으로 체류시간 및 표면부하율을 산정한 결과 각각, 6.24 day, 2.17 m$^3$/m$^2$/day로 나타났다. 퇴적물유형은 CLAY이고, 분급상태는 poorly sorted로 나타났다. 또한 유기물함량 및 미생물활성도(탈수소효소)도 각각 12.19 %, 1.63 $\pm$ 0.53 mg/kg로 높게 나타났다. 참조습지의 형상비, 수심분포, 식생유형, 토양특성 등을 반영하여 인공습지를 조성하였다.

• Horticultural Science & Technology
• /
• v.17 no.5
• /
• pp.569-571
• /
• 1999

The effects of training methods on growth and yield of white spine cucumber (Cucumis sativus L. cv. Sharp-1) were examined. The numbers of nodes, leaf area and root weight were in the order of, from high to low, ateral vine, main plus lateral vine, and main vine training. The total and marketable fruit yields were higher by the lateral training method than those by the other ones. The labor required for training was in the order of, from low to high, lateral vine, main vine, and main plus lateral vine training methods.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.3A
• /
• pp.337-346
• /
• 2004

Punctured convolutional codes increase transmission efficiency without increasing hardware complexity. However, Viterbi decoder supporting punctured codes requires long decoding length and large survivor memory to achieve sifficiently low bit error rate (BER), when compared to the Viterbi decoder for a rate 1/2 convolutional code. This Paper presents novel architecture adopting a pipelined trace-forward unit reducing survivor memory requirements in the Viterbi decoder. The proposed survivor path architecture reduces the memory requirements by removing the initial decoding delay needed to perform trace-back operation and by accelerating the trace-forward process to identify the survivor path in the Viterbi decoder. Experimental results show that the area of survivor path unit has been reduced by 16％ compared to that of conventional hybrid survivor path unit.

• Journal of IKEEE
• /
• v.17 no.2
• /
• pp.119-128
• /
• 2013

This paper proposes and implements an core transform architecture, which is one of the major processes in HEVC video compression standard. The proposed core transform architecture is implemented with only adders and shifters instead of area-consuming multipliers. Shifters in the proposed core transform architecture are implemented in wires and multiplexers, which significantly reduces chip area. Also, it can process from $4{\times}4$ to $16{\times}16$ blocks with common hardware by reusing processing elements. Designed core transform architecture in 0.13um technology can process a $16{\times}16$ block with 2-D transform in 130 cycles, and its gate count is 101,015 gates.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2002.02a
• /
• pp.257-262
• /
• 2002

본 연구에서는 분쇄방법에 따른 감초 분쇄생성물의 특성을 분석한 결과는 다음과 같다. 1. Hammer mill의 경우 d$_{80}$=750$\mu\textrm{m}$로 중간미분쇄의 입도범위를 가지며 비표면적은 0.269m/g로 분석되었고, Pin mill의 경우 d$_{80}$=600$\mu\textrm{m}$로 Hammer mill보다 입자크기는 조금 작으나 중간미분쇄영역의 입도범위를 가지며 비표면적은 0.324m$^2$/g로 분석되었고, Turbo mill은 d$_{80}$=250$\mu\textrm{m}$와 비표면적은 0.370m$^2$/g로 입자의 크기가 가장 작아 다른 분쇄기보다 분쇄능이 가장 우수한 것으로 분석되었다. 2. Hammer mill의 분쇄메커니즘은 대부분 충격, 일부 전단과 마찰에 의해 분쇄가 행해지고, Pin mill은 핀 사이에서의 전단, 충격, 마찰에 의해 분쇄된다. 즉 충격과 마찰에 의한 분쇄는 전단력에 의한 분쇄메커니즘보다 분쇄 능이나 분쇄효율이 상대적으로 낮은 것을 알 수 있었으며 주로 전단력과 충격, 반발력에 의해 분쇄가 이루어지는 Turbo mill의 분쇄능 및 분쇄 효율이 우수함을 알 수 있었다. 본 연구에 의해서 감초와 같이 섬유질을 많이 함유하고 있는 원료를 분쇄할 경우 분쇄메커니즘이 전단력인 분쇄기가 가장 적합하고, 분쇄중 소요되는 동력 면에서도 기존 분쇄기보다 우수한 Turbo mill의 분쇄조건을 확립해야 한다고 사료된다. 사료된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.524-526
• /
• 2016

본 논문에서는 클러스터의 개수를 다양하게 설정하여 누적된 변화율이 가장 작은 변화율을 가진 클러스터 개수를 동적으로 설정하는 방법을 제안하여 백내장 영역을 추출하는 방법을 제안한다. 제안된 백내장 추출 방법은 애견 안구 영상에서 관심 영역을 ROI 영역으로 설정한다. 설정된 ROI 영역에 퍼지 스트레칭 기법을 적용하여 픽셀의 상한 값과 하한 값을 조정한다. 퍼지 스트레칭 기법이 적용된 ROI 영역에서 FCM 알고리즘을 적용하여 클러스터 소속 행렬의 중심 값의 변화율이 가장 적은 개수를 최적의 클러스터 개수로 설정하여 ROI 영역을 양자화 한다. 양자화된 ROI 영역에서 침식 및 팽창 기법을 적용하고 ROI 영역의 면적을 기준으로 1/5보다 적은 면적을 가진 객체를 잡음으로 간주하여 제거한다. 잡음이 제거된 ROI 영역에서 ROI 면적의 3/5이상인 영역을 가진 안구 객체를 백내장 영역으로 추출한다. 제안된 방법의 효율성을 분석하기 위해서 애견 안구 영상을 대상으로 실험한 결과, 기존의 FCM을 적용하여 ROI 영역을 양자화 하는 처리 시간보다 제안된 클러스터 수 설정 기반 FCM을 적용한 양자화 방법이 처리 시간이 적게 소요되고 객체들을 정확히 분류하는 것을 실험을 통하여 확인하였다.

• The Korean Journal of Pesticide Science
• /
• v.17 no.3
• /
• pp.231-236
• /
• 2013

A solution on pesticide minor use is being requested world widely on behalf of growers and for the appropriate measure for pesticide regulation. Presently, definition on "minor use" is different by country. And furthermore registration for pesticide use and the regulation approach are dependent on whether the crop is minor or major. For these reasons, management for pesticide minor use are more complicated and aggravated. This paper aimed to provide information on definition of minor use, minor use programs and regulatory incentives for minor use registration, with the purpose of supporting in developing a possible solution on minor use situation in Korea. In conclusion, two suggestions were made based on the worldwide information on pesticide minor use. First, a prudent consideration should be taken in defining minor use legally in Korea, which should include all situations regarded with minor use of pesticide, besides the use of pesticide on the crops cultivated in small area. Secondly, it is proposed to strengthen the present program, the "Ex Officio Registration" (implemented since 1998 in Korea, lead by the Rural Development Administration) by introducing a cooperative program like IR-4 Project of the USA, which is well known as an effective program for minor use solution as mentioned in the OECD guidance.

• The Korean Journal of Pesticide Science
• /
• v.13 no.1
• /
• pp.28-38
• /
• 2009

An extrapolation of residue data of seven commonly used pesticides namely bifenthrin, chlorothalonil, cypermethrin, diazinon, fenvalerate, phenthoate and procymidone on a total of 22 minor crops has been carried out in an experimental field trial. The pesticides were applied to 11 leafy-, 5 root- and 6 stem-crops grown in the experimental green-house and the crops and plants were randomly collected at 1, 3, 5, 7 days after application. The average recoveries of applied pesticides were ranged from 72.0 to 117.0% in leafy crops, from 81.3 to 105.0% in stem crops and from 70.1 to 108.1% in the root-crops. Limits of detection (LODs) were 0.005-0.1 mg/kg in the leafy crops and 0.001-0.005 mg/kg in both the stem & root crops. Based on the results of residual dissipation pattern and their morphology, all crops were classified into high and low residual groups. The results showed that it might be possible to extrapolate residual data of stem-crops to root-crops within the same group. Crops that have currently no registered pesticide for use, would be possible to use the pesticides which are already been registered for the similar crops.