• Proceedings of the Plant Resources Society of Korea Conference
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• 2023.04a
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• pp.3-3
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• 2023

우리나라 딸기는 시설재배 발전과 품종개발로 겨울을 대표하는 과일로 변신하였다. 이는 저온단일에서 꽃이 만들어져 착과되는 생태적(일계성)특성 때문이다. 우리나라의 딸기 정식기는 95%이상이 촉성작형으로 9월 중순 정식한 후 11월 하순부터 이듬해 5월 하순까지 약 6개월간 수확한다. 반대로 여름작형은 고온장일에서 꽃이 만들어져 착과되는 사계성 품종을 이용하는데 우리나라 500m 이상의 산간 고랭지에서 3-4월에 정식한 후 6월부터 11월까지 수확하지만 생산량은 전체의 0.3% 미만이다. 또한 여름딸기는 제과용으로만 사용되고 있어 6월부터 11월 사이에 신선딸기의 단경기가 발생된다. 이러한 문제를 재배적으로 해결하기 위해 일계성 품종을 이용하여 겨울부터 봄까지 포기냉장한 후 여름과 가을에 꺼내어 정식하면 45일 내외에 수확하는 주냉장 억제작형을 시도하였으나 우리나라에선 실용성이 떨어져 사라져간 기술이다. 그러나 네덜란드는 우리나라와 같은 주냉장기술을 활용(Waiting bed system, Table top system)하여 여름과 가을철에도 딸기를 생산하고 있다. 이 작형은 냉장기간이 길고 재배기술도 까다로울 뿐만아니라 1화방만 수확하여 수량성이 낮은 단점이 있다. 한편 미국에서는 일계성 품종이 품질은 좋으나 고온기에 꽃대발생이 어렵고 사계성은 품질이 떨어지는 단점을 극복하기 위해 일장의 길이와 관계없이 꽃대가 형성되는 중일성 딸기 품종을 보급하여 세계적으로 가장 많은 재배면적을 점유하고 있다. 연중생산이 가능한 중일성 품종을 개발하기 위해 먼저 유전자원을 수집하였고 품질이 좋은 일계성 품종을 중일성 품종과 교배하여 채종하였다. 교배종자를 파종하여 묘를 만든 후 정식하여 실생개체를 선발한 결과 고온장일 조건에서 개화되는 사계성(중일성)율은 약 10-20% 범위로 매우 낮았다. 선발된 우량계통은 영양번식을 통해 증식하여 생산력, 특성, 지역적응성 검정과정을 통해 품종을 개발하였다. 이렇게 단교잡에 의한 중일성 품종 선발육종은 선발율이 0.05%으로 매우 낮았다. 이렇게 우리나라 최초의 중일성딸기 '고슬' 품종이 개발되었다. 이 '고슬'은 9월부터 수확이 가능한데 이 때의 딸기 가격이 kg당 20,000원 이상으로 높으며, 수확기간은 '설향'보다 4개월 더 길게 재배가 가능하다. 연중재배를 위해서는 항상 8-25℃의 범위을 유지해야 품질이 높아지므로 재배관리가 중요하다. 흰가루병에는 저항성이 있으나 시들음병과 탄저병에는 약하고 당도와 경도가 높고, 향이 매우 진하다. 식물공장에서 매우 인기가 있는데 안정된 꽃대발생과 대과, 고당도와 함께 수술의 화분량이 많아 수정이 잘되는 특성으로 식물공장 사업이 확장되고 있는 중동나라에서도 로열티 계약(UAE 등)이 예정되어 있다. 1년 연중 개화되고 착과되는 특성으로 가정에서 기르는 반려식물로도 인기가 있다. 또한 아열대 고랭지대는 항상 서늘한 날씨이기 때문에 한번 정식후 1년 연중생산이 가능하여 2023년 베트남과 로열티 계약(1.6억원)을 하였다. 또한 '고슬'은 우리나라 신선딸기 수출 단경기에 생산되어 주년생산 수출체계에도 기여할 것으로 본다.

• Communications of the Korean Mathematical Society
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• v.16 no.4
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• pp.543-566
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• 2001

이차원 선형 탄성방정식을 소개하고 약한 형식 타원성을 보여준다(P-1)순응 유한요소를 사용할 때 나타나는 잠김현상을 설명하고 그 해결책으로서 비순응 유한요소법과 penalty 항을 가진 혼합문제, 일계 최소자승법 등을 소개한다.

• Horticultural Science & Technology
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• v.32 no.1
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• pp.100-104
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• 2014

This study was conducted to determine the optimal MS medium strength to improve sprouting rate of apical meristem of strawberry 'Seolhyang' in vitro. Strawberry apical meristems at size (0.2 mm to 0.3 mm) with leaf primordials were cultured on the MS media with four strength levels, ($1/4{\times}$, $1/3{\times}$, $1/2{\times}$, and $1{\times}$) and the sprouting rate and growth characteristics were evaluated after eight weeks after cultivation. Shoot rate of 'Daewang' apical meristems was 93.6%whereas 'Seolhyang' apical meristems were sprouted with 31.6% on $1{\times}$ MS medium strength. Different sprouting rates were observed in 'Seolhyang' apical meristem with 31.6% in $1{\times}$ medium, 75.0% in $1/2{\times}$ medium, and 94.4% in $1/3{\times}$ medium. The sprouting rate was improved with the decrease of medium strength, but the shoot rate in $1/4{\times}$ medium decreased up to 54.5%. Shoot length was 0.9 cm in $1{\times}$ medium, 1.2 cm in $1/2{\times}$ medium, 1.6 cm in $1/3{\times}$ medium, and 1.9 cm in $1/4{\times}$ medium. Shoot length was longer as medium strength decreased and numbers of leaves and roots were not significant differences among the medium strengths. As a result, sprouting rate was highest and plant growth was best in $1/3{\times}$ MS medium compared to the others.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.3
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• pp.209-215
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• 2009

A new load surface method for reliability of caisson type breakwater was proposed. Linear functions for horizontal wave force and uplift force were estimated by using water level and wave height then they were applied to the reliability analysis of breakwater using first order reliability method(FORM). In the numerical example, sliding and overturning failure probability of caisson type breakwater were analyzed by using load surface and they were compared with those by Monte Carlo simulation.

• Journal of the Korea Concrete Institute
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• v.22 no.4
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• pp.595-603
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• 2010

Monte-Carlo simulation technique is often used in order to predict service life of concrete structure subjected to chloride penetration in marine environment based on probability theory. Monte-Carlo simulation method, however, the method gives different results every time that the simulation is run. On the other hand, moment method, which is frequently used in reliability analysis, needs negligible computational cost compared with simulation technique and gives a constant result for the same problem. Thus, in this study, moment method was applied to the calculation of corrosion-initiation probability. For this purpose, computer programs to calculate failure probabilities are developed using first-order second moment (FOSM) and second-order second moment (SOSM) methods, respectively. From the analysis examples with the developed programs, SOSM was found to give a more accurate result than FOSM does. The sensitivity analysis has shown that the factor affecting the corrosion-initiation probability the most was the cover depth, and the corrosion-initiation probability was influenced more by its coefficient of variation than its mean value.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.2
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• pp.217-227
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• 1992

The first and second-order reliability method(FORM and SORM) is presented using one dimensional finite difference and two dimensional finite element transport models. FORM and SORM can be used without any restrictive assumptions about the properties of the media, and the sensitivity information obtained as part of these analyses is used to identify the parameters which have major influence on the estimate of probability. The reliability analysis of transport in a one-dimensional domain is used to test the robustness of the reliability code and to evaluate the accuracy of the reliability method. A continuous source 2-D example with a concentration threshold limit state function is used to evaluate the influence of the parameters in the location of interest on the reliability solution.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.28 no.2
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• pp.92-100
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• 2016

Reliability analysis of tripod support structure for offshore wind turbine was performed. Extreme distribution function of peak response due to wind and wave loads was estimated by applying peak over threshold(POT) method. Then, stress based limit state function was defined by using maximum stress of support structure which was obtained by multiplying beam stress and concentration factor. The reliability analysis result was compared when maximum stress was calculated from shell element. Reliability index was evaluated using first order reliability method(FORM).

• Horticultural Science & Technology
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• v.33 no.3
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• pp.448-452
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• 2015

'Seeberry' is a short-day $F_1$ hybrid strawberry for seed propagation, that was released by the Protected Horticulture Experiment Station (RDA, Republic of Korea) in 2013. Inbred lines derived from domestic germplasms and selected varieties were used to develop this cultivar. 'Seeberry' originated from a cross of two inbred lines: a male parent 'Wongyo 3115' with high firmness and a female parent 'Wongyo 3116' with excellent fruit shape and high yield. 'Seeberry' cultivar should be grown with a crown diameter of over 10 mm to reveal its unique characteristics. 'Seeberry' has an upright plant shape with elliptic leaves, 12-15 flowers per cluster, vigorless growth habit, and average flower bud differentiation compared to vegetatively propagated cultivars. Fruits of 'Seeberry' are conical, having light skin color and approximately 15-16 g in average weight. Yield of this cultivar is about 92% lower than that of 'Akihime', but 'Seeberry' has excellent taste, sugar content of $9.7^{\circ}Bx$, acidity of 0.6%, and good texture. With regard to disease and pest resistance, 'Seeberry' is sensitive to powdery mildew, aphids, and the two-spotted spider mite, and is resistant to anthracnose.

• Korea and Global Affairs
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• v.1 no.2
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• pp.109-128
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• 2017

The purpose of this study is to consider the appearance of the global generation transnational identity and forming process, existence aspect, functional role, and on the actuating mechanism, and etc. The results about the transnational identity of Diaspora and diversity are as follows. First, as to the transnational identity, the emigrants had been being determined by the relation with the accreditation and how type had been deal with one's decision about the self-identify. Second, the individual experience of the emigrant, interaction, and unstable status political support etc. various factors were combined and the diversity of the Diaspora identity showed. Third, the identity concept had been performing the function in the more expanded meaning called the nation and nation through the continuous meaning expansion than the individual as the national ideology. Fourth, the transnational identity of Korean-Chinese was specialized into the nation identity, double identity, and 'the identity of the third' etc. Fifth, the transnational identity of the Nikkei-Brazilian appeared for Japanese identity, Brazilian identity, and Nikkeijin identity etc. in Japan. In conclusion, the Transnational identity of the Diaspora is reproducing the identity of the emigrant, it suggests through the differentiation in the settlement and exclusion.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.6
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• pp.129-139
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• 2008

Due to uncertainty of numerous variables in durability model, a probalistic approach is increasing. Monte Carlo simulation (Level III method) is an easily accessible method, but requires a lot of repeated operations. This paper evaluated the effectiveness of First Order Second Moment method (Level II method), which is more convenient and time saving method than MCS, to predict the corrosion initiation in harbor concrete structure. Mean Value First Order Second Moment method (MV FOSM) and Advanced First Order Second Moment method (AFOSM) are applied to the error function solution of Fick's second law modeling chloride diffusion. Reliability index and failure probability based on MV FOSM and AFOSM are compared with the results by MCS. The comparison showed that AFOSM and MCS predict the similar reliability index and MV FOSM underestimates the probability of corrosion initiation by chloride attack. Also, the sensitivity of variables in durability model to corrosion initiation probability was evaluated on the basis of AFOSM. The results showed that AFOSM is a simple and efficient method to estimate the probability of corrosion initiation in harbor structures.