• Journal of Advanced Navigation Technology
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• v.23 no.5
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• pp.352-360
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• 2019

This paper proposes a docking assessment algorithm for an autonomous underwater vehicles (AUVs) with sensor uncertainties. The proposed algorithm consists of two assessments, state assessment and probability assessment. The state assessment verifies the reachability by comparing forward distance to the docking station with expected distance to reach same depth as the docking station and necessity for correcting its route by comparing calculated inaccessible areas based on turning radius of the AUV to position of the docking station. When the AUV and the docking station is close enough and the state assessment is satisfied, the probability assessment is conducted by computing success probability of docking based on the direction angle, relative position to the docking station, and sensor uncertainties of the AUV. The final output of the algorithm is decided by comparing the success probability to threshold whether to try docking or to correct its route. To verify the validation of the suggested algorithm, the scenario that the AUV approaches to the docking station is implemented through Matlab simulation.

• Journal of Sericultural and Entomological Science
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• v.20 no.2
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• pp.32-35
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• 1978

The infectious flacherie viruses are serious diseases in the silkworm, which affects the cocoon crops. However, there is only a few study on this diseases up-to-date in Korea and, in this experiment, the authors investigated the resistance of the silkworm varieties to flacherie and Ina-flacherie viruses by peroral infection. A cross, Hansaeng ＃1$\times$ Harisaeng ＃2, showed the highest resistance to the flacherie virus a Mudeung$\times$Geumho showed the lowest resistance among the examined varieties. It seemed that the varietal difference of resistance against Ina-flacherie virus was appeared and Jam117$\times$ Jam118, Gyeongchu$\times$Yeonil, Mudeung$\times$Geumho, Hansaeng＃1$\times$Hansaeng＃2 and Hansaeng＃3 $\times$ Hansaeng ＃4 showed non susceptibility by peroral infection. However it was shown that Jam115 $\times$Jam116 had the lowest resistance to Ina-flacherie virus.

• Journal of Sericultural and Entomological Science
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• v.20 no.2
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• pp.6-9
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• 1978

This experiment was attempted to investigate the effect of the specific gravity of silkworm eggs on the hatching and the practical hatching ratio depend upon six egg production companies for two silkworm races and their reciprocal crosses. 1. The hatching and the practical hatching ratio in the specific gravity of medium and heavy eggs were higher than in the specific gravity of light eggs. 2. Compare with Japanese or Chinese mother races each other, it was inclined that the former seems to be higher than the latter on the hatching ratio in the specific gravity of light and medium eggs, but the practical hatching ratio was high only in the specific gravity of light eggs. 3. Chinese mother races were different in the practical and the hatching ratio between the specific gravity of eggs. On the contrary in case of Japanese mother races were no difference for the hatching ratio but difference in the practical hatching ratio between the specific gravity of eggs. 4. On the egg production company, in case of the specific gravity of medium and light eggs, the hatching and the practical hatching ratio were high significance, but no difference in the specific gravity of heavy eggs.

• Industry Promotion Research
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• v.9 no.1
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• pp.189-202
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• 2024

It is not the water veins themselves that are distributed on Earth that are harmful, but the water vein waves generated from the water veins are harmful to human health. The natural frequency of the Earth is 7.83 Hz, but in order to sleep deeply, you must go down to a delta wave of 2 to 3.99 Hz, which is lower than this frequency, to achieve the deepest sleep and maintain your health. However, if you sleep in a place with dowsing waves, the dowsing waves interfere with your brain waves, making it difficult to sleep well, and you may have nightmares. Even when you wake up, your body is not refreshed and your fatigue does not go away, so you feel tired and tired easily. If this phenomenon continues, the body's resistance decreases and immunity weakens, which can eventually cause illness and cause various diseases, which can harm one's health. In other words, the safest and most effective way to deal with water veins is to avoid places with water veins and simply change your sleeping position to a place without water veins, and you can live a healthy and happy life through examples.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.15 no.4
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• pp.207-213
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• 2003

This study is to numerically investigate the characteristics of wave energy variations propagating over impermeable submerged breakwaters with irregular waves. Two-dimensional numerical wave flume based on the VOF method was used. VOF method is the most efficient capable of simulating free surfaces including wave breaking. From the computed frequency spectrum results, wave breaking play important role in ability of the submerged breakwaters to dissipate incident wave energy. In case of occurring wave breaking, our analysis shows that wave energy moves to short wave period on one-row impermeable submerged breakwater's lee side and is widely distributed not having peak period on two- row impermeable submerged breakwater's lee side.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.226-230
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• 2006

홍수피해잠재능(Potential Flood Damage: PFD)은 면 개념을 도입함으로써 치수단위구역의 치수특성 및 사회경제적인 가치를 함께 평가할 수 있도록 고안된 지수로 이미 여러 유역에서 시행되고 있는 유역종합 치수계획 사업에서 사용되고 있으나, 몇 가지 중요한 문제점이 꾸준히 제기되어 왔다. 본 연구에서는 우선 다음과 같은 이론적 문제점을 검토하였다. PFD는 처음 제안될 당시 (이하 기존 PFD) '잠재성'과 '위험성'라는 두 가지 요소가 곱해지는(multiplicative) 형태로 구성된 후 '위험성' 요소 안에 '가능성'과 '방어능력'이 더해지는 (additive) 형태를 취하고 있었다. 그러나 본 연구에서는 (이하 수정 PFD) '피해대상', '피해가능성', 그리고 '방어취약성'이 모두 곱해져야 이론적으로 타당함을 제시하였다. 기존 PFD는 '방어취약성'이 0의 값, 즉 홍수에 대한 완전방어를 의미하는 값에 가까워져도 PFD 값이 0에 수렴하지 않는 반면, 수정 PFD는 위의 경우 홍수 피해잠재능이 0에 수렴하는 것을 요소별 시나리오 모의를 통해서 확인할 수 있었다. 두 번째로 본 연구에서는 PFD를 이용하여 유역의 목표치수안전도 설정 방안을 제시하였다. PFD의 물리적인 의미가 무차원화 된 피해량 임을 전제로, 피해대상으로부터 목표방어율을 설정한 후 이에 해당하는 목표방어취약성을 계산하는 절차를 전개하였다. 추후 이 방법을 실제 자료에 적용하여 검증하는 연구가 이어져야 할 것이다.

• KSBB Journal
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• v.17 no.6
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• pp.520-524
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• 2002

The present study was designed to investigate the effects of Stachys Sieboldii MIQ as a new natural antitumor agent or immunomodulator. To obtain the above objectives, Stachys sieboldii MIQ was extracted with ethanol. Stachys sieboldii MIQ accelerated mouse spleen cell growth, but inhibited FM3A/S°-cell growth. However, no significant difference was found for CD4+ / CD8+ cells. The growth rates of CD4+ and CD8+ T cells were accelerated more than those normal mouse group. Stachys sieboldii MIQ fed mice showed a significant enhancement of IL-2 receptor expression, increased numbers of CD4+ T cells, and CD8+ T cells. Stachys sieboldii MIQ also stimulated the production of NO by peritoneal macrophages and the production of NO by and the growth of mouse spleen cells. On the other hand, lung localization of Bl6Fl0 melanoma cells was inhibited by ethanol extract of Stachys sieboldii MIQ. These results show that Stachys sieboldii MIQ is a useful new functional antitumor agent or immunomodulator.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.25 no.3
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• pp.172-180
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• 2013

The focus of this study is to provide a method for determining the dimension of a submerged breakwater satisfying the target transmission performance or predicting the transmission coefficient of a given structure. This method was developed based on data analysis of the physical experiment that was carried out by using the submerged breakwater composed of double-layer permeable blocks. Two different armor blocks of Tetrapod and Triangular Pyramid Block were used in the experiment. The parameter $K_Th_b/h$ was introduced in the analysis of the measurement data. By using the linear regression line deduced from the analysis of the experimental data, it was possible to readily predict the wave transmission coefficient irrespective different water depths at the crest of the submerged breakwater, under the condition of significant decrease in transmitted wave height due to the submerged breakwater. This method can be effectively utilized for estimating the necessary number of blocks used for the submerged breakwater as well as comparing the transmission characteristics of the submerged breakwater according to use of different armor blocks.

• Journal of Sericultural and Entomological Science
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• v.51 no.1
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• pp.63-67
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• 2013

A new silkworm variety "WhangBoJam" for spring rearing season is F1 hybrid between Jam317, a japanese strain bred from introduction breeding and Jam318, a chinese strain from introduction breeding. In the local adaptability test performed at 8 local areas in spring of 2012, the hatchability rate of WhangBoJam was recorded 95% similar to Kum HwangJam. The larval period was 8hours more long than KumHwangJam. The pupation percentage was recorded 6.6% higher than KumHwangJam. Single cocoon weight was recorded 2.29 g similar to KumHwangJam and cocoon yield(21.3 kg) was higher than KumHwangJam. The concentration of DNJ was measured to 0.22% in WhangBoJam, lower than DaePoongJam(0.26%). In the Paecilomyces tenuipes production ability test, the pupal weight of Whang BoJam was 1.33 g/individual, higher than KumHwangJam (1.19 g/individual).

• Journal of Sericultural and Entomological Science
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• v.50 no.1
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• pp.1-4
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• 2012

A new silkworm variety "DaeBakJam" for spring rearing season is F1 hybrid between Jam155, a japanese race bred from introduction breeding and Jam156, a chinese race from introduction breeding. In the local adaptability test performed at 8 local areas in spring of 2010, the hatchability rate of DaeBakJam was recorded 96% similar to DaePoongJam. The larval period was 3 hour shorter than DaePoongJam. The pupation percentage was recorded 0.2% higher than DaePoongJam. Single cocoon weight (2.72 g) and Cocoon yield (25.4 kg) was higher than DaePoongJam. The concentration of DNJ was measured 3.28 mg in DaePoongJam, lower than DaePoongJam (3.48 mg). Test of the artificial diet of DaeBakJam showed bad adaptability of the artificial diet for larval period from 1st to 3rd, but KumOkJam showed excellent adaptability of the artificial diet. In the Paecilomyces tenuipes production ability test, the pupal weight of DaeBakJam was 1.69 g/individual, higher than DaePoongJam (1.59 g/individual).