• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.5
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• pp.372-375
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• 2003

In order to examine the possibility that oil seed rape could be used as a forage fodder crop and to select the most suitable variety of forage rape at the southern area of Korea, two varieties of oil seed rape currently grown for oil production and six introduced varieties of forage rape with relatively high yield and high nutritional value were grown at the same condition and their nutritional value were observed. Generally, rape was considered as a useful forage fodder crop with high content of crude protein and low contents of NDF, ADF, hemicellulose, cellulose and lignin. Differences in mean values of the above characters between two groups of rape were not statistically significant. Velox showed significantly higher content of crude protein and significantly lower contents of NDF, ADF, hemicellulose, cellulose and lignin compared with other varieties of forage rape. Rape was relatively high in IVDMD compared with other forage fodder crops, and forage rape was more or less higher in IVDMD and DDMM than oil seed rape. Velox was the highest in IVDMD and DDMM among the varieties of forage rape in this experiment.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.5
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• pp.376-380
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• 2003

In order to examine the possibility that oil seed rape could be used as a forage fodder crop and to select the most suitable variety of forage rape at the southern area of Korea, two varieties of oil seed rape currently grown for oil production and six introduced varieties of forage rape with relatively high yield and high nutritional value were grown at the same condition their and yield components were observed. Forage rape was superior to oil seed rape in terms of yield components, plant fresh weight and plant dry mater weight. Velox was superior to any other variety of forage rape in these characters. When plant dry matter weight of the rape was subdivided into four components such as a main stem, branch stems, main stem leaves and branch leaves, contribution of these components to plant dry matter weight was in the order of branch stems, branch leaves, the main stem and main stem leaves. Dry matter percentage of the rape ranged from 9.32 to 11.08 percent, which was somewhat low value. There was no significant difference between two groups of the rape in terms of dry matter percentage. Velox showed somewhat higher value in dry matter percentage.

• Journal of the Korean Institute of Landscape Architecture
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• v.26 no.3
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• pp.8-18
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• 1998

This study was to make a effective seed mixture types with Korean native plants by researching te seed timing of suitable woody plants and competitive germination results of various plants for the purpose of cut-slotes revegetation. The results are summarized as follows. 1. In field polystand experiment, comparative among severalcomposition combination for early coverage shows good condition. 2. In combination for early-coverage, mixture of native woody plants only seeded in May and June shows over 90% coverage. It was not inferior to the other mixture types. So mixture of Albizzia Julibrissin, Cymbopogon doeringii, Alnus hirsuta and Indigfera pseudo-tinctoria is able to use to mixture type. 3.In case of combination for scenic beauty, Rhus chinensis shows low germination in the mixture for scenic beauty. But 90 days after seeded in May, it recorded maximum 44 cm height, seeded in June recorede 18 cm height. 4. Lespedeza crytobotrya shows good elongation in the combination for early coverage and scenic beauty, but that effects on elongation of other plants. So, it demands close investigation about suitable mixing rate of plants. 5. Alnus hirsuta, Pinus thunbergii, Betula platyphylla, Spiraea prunifolia var. simpliciflora have been rarely germinated. So, the mixture of these plants wasn't adequate to use for revegatation.

• Journal of Wetlands Research
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• v.4 no.2
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• pp.1-11
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• 2002

The morphology, seed germination, and life history of Salix nipponica were investigated in the wetland of the Nam-River, Jinju, Gyeongsangnam-do, Korea from 2000 to 2001 to provide the basic data necessary for riverine ecosystem restoration through understanding the growth characteristics of Salix nipponica. Salix nipponica had stomata on only lower side and stomata type was paracytic. Salix nipponica produced many small and light seeds. The seed number per mature ament was 1599.4, seed mass of 0.04 mg, and fertilization rate of 66.1%. Seed germination was little affected by light. Germination rate was high and mean germination time was short Under flooding condition, seeds were germinated normally and were viable after as much as 14 days of flooding. But there were no differences under various water depths on germination rates. Tree age was closely correlated with more stem diameter than tree height and there was no difference of growth rate between male and female tree. Growth rate was most rapid for 2 to 3 years after germination, and length growth was almost stopped for more than 11 years even though mass growth was done. Besides even a second-year indivisual was flowered.

• Journal of the Korean Institute of Intelligent Systems
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• v.27 no.1
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• pp.65-71
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• 2017

Since existing Internet of Things(IoT) is vulnerable, it may cause property damage due to the information leakage. Especially, the smart door lock system built on the IoT can cause more damage. To solve these problems, this paper classify the data generated by the sensor according to the condition and send an alarm message to the user's smartphone through Google Cloud Message (GCM). We made it possible to check the images in real time through the smartphone application and control the door lock using the TCP / IP protocol. Also, we applied OTP-Based Matrix SEED algorithm to door lock system to improve security.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.4
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• pp.370-377
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• 1989

Jerusalem artichoke (Helianthus tuberosus L.) as a biomass potential crop has several distinct advantages such as vigorous growth on poor land and high yield of carbohydrate. In this crop, seed dormancy has hampered the efforts of seed-propagration and to use them in breeding programs for improving jerusalem artichoke. Several seed treatments were tested to determine their effectiveness in overcoming the seed dormancy found in five collected varietes of jerusalem artichoke. The first results showed that the seed fertilities of five collected varieties ranged from 2.4％ to 14.7％ and the number of seed produced by one plant ranged from 88 to 1058. Germinability of seeds stored for 3 months at room temperature after harvest was almost 0％ and it was not improved by addition to the treatments of temperature, light and GA3, while germinability of seeds stored for 27 months at room temperature after harvest increased to 47.5％ in germination rate. But the removal and pin-pricking of seedcoat were very effective in breaking the seed dormancy, giving germination of 96.8％ and 82.3％, respectively. These results showed that the seed dormancy of jerusalem artichoke was induced by the seedcoat. Besides the treatment of seedcoat removal and seedcoat-pinpricking, the treatment of low and wet stratification was also effective in breaking the seed dormancy of jerusalem artichoke. Whole dormant seeds incubated for 70 days in low and wet condition germinated over 85％.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.222-222
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• 2010

III-V반도체 태양전지는 다양한 에너지 밴드갭을 만들 수 있으며 다중접합 태양전지의 경우 흡수 전류가 커져 효율이 증가한다. 태양전지의 효율의 증가는 태양광 발전시스템의 발전 단가를 낮추는 중요한 요인이다. 우리는 효율이 높은 III-V 태양전지를 제작하기 위해 일차적으로 Ge기판 위에 GaAs를 성장하고자 한다. Ge기판과 GaAs의 격자상수는 0.07%차이로 거의 일치하나 물질의 열팽창계수가 다르고 비극성인 Ge기판 위에 극성인 GaAs를 성장 시 위상불일치(Anti Phase Domain) 나타난다. 위상불일치 현상을 줄이기 위해 성장 시 온도와 V/III비율, 성장두께 등을 달리하여 성장한다. 표면의 상태가 좋아질수록 위상불일치 현상이 작으며 단일성장 보다 두 단계 과정으로 성장 했을 때 표면의 상태가 더 좋은 결과를 바탕으로[1], 20nm 이하로 얇게 seed층을 성장하고 그 위에 두꺼운 버퍼층을 성장하는 두 단계로 진행하였다. seed층의 성장온도는 $400{\sim}550^{\circ}C$, V/III 비율을 3.5~30으로 다양하게 바꿔가면서 표면의 상태를 비교하였다. 이때 버퍼층의 성장 온도와 V/III 비율은 $680^{\circ}C$, 192으로 일정하게 유지하였다. 표면은 SEM과 AFM을 통해 분석하였으며 결정질의 상태는 XRD 장비(Panalytical사)로 분석하고 광학적 특성은 LTPL(Accent Optical Technologies사)로 측정하였다. 실험의 결과는 seed층의 온도가 낮고 V/III 비율이 낮으며 성장률이 높았을 때 표면상태가 좋은 반면 버퍼층은 온도가 높고 V/III 비율이 높으며 성장률이 낮을 때 표면상태가 좋았다. seed층을 $450^{\circ}C$온도에서 V/III 비율이 3.5이고 성장률이 버퍼층에 비교하여 크게 하여 성장 했을 때 표면 거칠기가 3.75nm로 작아 표면의 상태가 좋음을 확인할 수 있었다. 두 단계 성장 시 표면의 상태는 seed층의 조건에 따라 결정됨을 알 수 있었다. 표면상태가 좋았을 때 결정상태 역시 좋았으며 성장률이 바뀜에 따라 반치폭이 42~45 arcsec의 값을 나타내었다. 광학적 특성은 10K에서 1.1512eV 밴드갭 에너지를 가지고 있어 양질의 GaAs가 성장됨을 알 수 있다.

• Applied Chemistry for Engineering
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• v.8 no.2
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• pp.301-307
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• 1997

Monodisperse, spherical $SiO_2/TiO_2$ composite fine powders were prepared by modified Sol-Gel process which $TiO_2$ fine Powders was used as a seed particles for condensation of TEOS (Tetraethyl Orthosilicate). The reaction was carried out under $N_2$ atmosphere at ambient temperature using $NH_3$ as a catalyst. Ethanol was used as a solvent. Drying process was carried out with vacuum trap which cooled by liquid $N_2$. The reaction variables were the concentration of TEOS, the concentration of ammonia, the size of $TiO_2$ seed and molar ratio of $SiO_2/TiO_2$. The optimum condition for the preparation of $SiO_2/TiO_2$ composite fine powders without agglomeration was [TEOS]=0.3M, [$NH_3$]=0.7M, size of $SiO_2/TiO_2$ seed = 200~300nm.

• Korean Journal of Medicinal Crop Science
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• v.9 no.4
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• pp.259-264
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• 2001

This experiment was conducted to examine the seed structure and to investigate the changes of seed vigor and germinability according to storage condition of Astragalus membranaceus. In case of the hard seed, there observed a gap between a testa and an embryo with abnormal shapes of an hilum and its micropyle. Seeds stored at room temperature maintained vitality for 4 months but continued to lose its vitality, while increase the hand seeds ratio as storing time longer. The content of Ca increased in proportion to the length of storing time.

• Korean Journal of Medicinal Crop Science
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• v.2 no.1
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• pp.32-37
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• 1994

This experiment was conducted to obtain the basic information for the increase ofgermination percent by the seed diameter, specific gravity, different grain filling period and stratification in Bupleurum falcatum seeds. The seed size of B.falcatum ranged from 2.0 to 3.9mm in diameter, The large seed showed the higher germinability, The optimum specific gravity of salt selection for seed screening was 1.05 resulting in screening out seeds with high germinability over 70%.The seeds needed grain filling period for 60 days or longer after flowering to keep high germinability The optimum period of stratification treatment to promote seed germination was about 80 days.