• Korean journal of applied entomology
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• v.32 no.4
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• pp.450-456
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• 1993

We investigated effects of a topical treatment of methoprene(0.5-5.0$\mul$/egg), a juvenLle horm mane analogue, on embryo development in the gypsy moth, Lymantri$\alpha$ dispar. Methoprene lowered egg hatching rate, and also reduced the mean wet weights of hatched 1st instar larvae w with the most effect shown at the highest concentration. The differences in protein(p < 0.01) and carbohydrate(p < 0.05) contents between control and methoprene(5$\mul$/ egg) treatment g groups were observed during embryo development.

• Journal of Wetlands Research
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• v.17 no.3
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• pp.320-324
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• 2015

This study was executed to know the effect of three differently controlled temperature conditions on Huanren brown frog (Rana huanrensis )'s growth in 2013. We've collected nine Huanren brown frog egg's sacs on Mt. Surak ($37^{\circ}40^{\prime}55.86^{{\prime}{\prime}}N$, $127^{\circ}05^{\prime}19.99^{{\prime}{\prime}}E$) in Seoul. We put those nine egg sacs in the controlled growth chambers under low temperature (LT, $5{\pm}2^{\circ}C$), medium temperature (MT, $10{\pm}2^{\circ}C$), and high temperature (HT, $13{\pm}2^{\circ}C$) conditions with three egg sacs, respectively. We measured the eggs' hatching rate, their hatching periods, and the size of the hatched individuals. The hatching rate was higher in MT (95.6%) and the rates of the other treatments were relatively lower but very similar such as LT (82.2%) and HT (82.6%). The three hatching periods were 10 days at HT, 14 days at MT and 23 days at LT. The body sizes of the hatched individuals were biggest at MT ($7.62{\pm}0.11mm$), smallest at LT ($6.82{\pm}0.10mm$) and medium at HT ($7.19{\pm}0.15mm$) (P-value ${\leq}0.0001$). From our results, we found that the various water temperatures could be very effective to Huanren brown frog eggs' hatch and growth including their body sizes. We suggest if we study more about the growth of Huanren brown adult frogs under similar temperature conditions for a long term period, it must be very helpful for conservation study about metamorphosis rate and size of adult frog as well as we could understand about the amphibians who are adapting to the climate change.

• Journal of Aquaculture
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• v.9 no.2
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• pp.141-149
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• 1996

Effects of $17{\alpha}$-methyltestosterone ($17{\alpha}-MT$) in rearing water on sex reversal of Nile tilapia (Oreochromis niloticus) were investigated and optimum conditions as initial treatment time, concentrations and treatment durations of hormone were evaluated in this study. For the study of the optimum initial treatment time, 0 to 20-day-old fry were treated by immersion in a 500 ppb solution of $17{\alpha}-MT$. Desirable results were obtained at 12-day-old fish as $86.4\%$ of male induction rates and this frequency was obviously higher than the other age groups. Twelve-day-old fry were immersed in $17{\alpha}-MT$ solutions at concentrations of $0\~2,000$ ppb for 24 hours for the study of dose dependent relationship between sex ratios and concentrations of $17{\alpha}-MT$, Male induction rates of all treated groups were higher than $80\%$, $X^2$ values against the sex ratio of control group indicate that sex reversal has taken place effectively in all experimental groups (P<0.001). Futhermore, 500 ppb treated groups showed highest male incidence of $86.4\%$. Effects of 5 different durations (0, 12, 18, 24 and 30 hours) treated with 1,000 ppb of $17{\alpha}-MT$ were also evaluated. Male induction rate from 0 to 24 hours treated group was increased with treatment durations. However, male incidence of 30-hour treated group ($84.0\%$) was sligthly decreased compare to the 24-hour treated group ($85.2\%$). It is concluded that immersion treatment using $17{\alpha}-MT$ on O. niloticus is possible on sex reversal at low concentration of 500 ppb and short treatment durations within 24 hours with 12-old-day fry.

• Journal of Aquaculture
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• v.11 no.1
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• pp.11-17
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• 1998

Variations of hepatocyte in the larval liver of grouper, Epinephelus akaara wre examined to understand the effect of starvation during the first feeding period, 3 to 5 days after hatching. Total length of the fed larvae increased from the 5th day after hatching, although no significant difference between the fed and starved larvae was found untill the 4th day after hatching. Survival rate of the starved larvae decreased from the 4th day after hatching, and almost all of the larvae died by the 5th day after hatching. Nuclear size of hepatocyte in the starved larvae starterd to decrease from the 4th day after hatching. The sizes by 4th and 5th days after hatching in the starved larvae were 1.4 to 1.9 times smaller than those in the fed ones. Hepatocytes in the starved larvae showed irregular morphology in which the nuclei were irregularly shrunk and highly compacted from the 4th day, while hepatocyte nuclei in the fed ones maintained their uniform features during the whole experimental period. These results implied that the initial larval food should be supplied at least within the 4th day after hatching. Also, it suggested that the size of hepatocyte nucleus might be and indicator of starvation for wild and cultured grouper larvae.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.2
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• pp.144-149
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• 2018

The eggs are incubated for 18 days through the generator and incubated in the developing incubator. During the developmental period, the weight loss of the fetus is correlated with the ventricular formation, and the proper ventricular formation is also associated with the healthy embryonic hatching and the egg hatching rate. However, in the incubator period of the domestic hatchery, it is a reality to acquire the resultant side by the Iranian standard weight measurement with the experience of the hatchery and the person concerned and the development period without the apparatus for measuring the present weight. As a result, prevalence of early mortality, hunger and illness during hatching are frequent. Monitoring the reduction of weaning weight is crucial to obtaining chick quality and hatching performance with weight changes within the development machine. Water loss is different depending on the size of eggs, egg shell, and elder group. We can expect to increase the hatching rate by measuring the weight change in real time and optimizing the ventilation change accordingly. There is a need to develop a real-time measurement system that can control 10 to 13% reduction of the total weight during hatching. The system through this study is a way to check the one - time directly when moving the existing egg, and it is impossible to control the measurement of the fetal water evaporation within the development period. Unlike systems that do not affect the hatching rate, four load cells are connected in parallel on the Arduino sketch board and the AT-command command is used to connect the mobile phone and computer in real time. The communication speed of Bluetooth was set to 15200 to match the communication speed of Arduino and Hyper-terminal program. The real - time monitoring system was designed to visually check the change of the weight of the fetus in the artificial incubator. In this way, we aimed to improve the hatching rate and health condition of the hatching eggs.

• Proceedings of the Membrane Society of Korea Conference
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• 1994.10a
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• pp.38-41
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• 1994

막분리(membrane separation)법은 막 전후의 압력차, 농도차 등을 추진력(driving foroe)으로 하여 분리대상물질에 대한 막의 선택투과성 차이를 이용, 분리를 행하는 것이다. 이 분리법은 기존의 분리공정인 심냉법(cryogenic separation)과는 달리 상변환 공정이 필요없어 에너지가 적게 들고 또한 PSA(pressure swing adsorption)법에서와 같은 cycle 운전이 필요없어 연속적으로 분리가 가능하며 시스템도 간단하다. 최근 기체 막분리의 경우 수소 및 탄산가스의 회수정제, 공기중의 산소와 질소의 분리 등에 실용화되고 있다. 여기서는 공기중의 산소를 분리하여 30-40% 산소부화공기(oxygen enriched air)를 간편하게 제조할 수 있는 산소부화막장치와 연소장치에의 응용기술 및 연구결과에 대해 간략히 소개하고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.149-150
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• 2017

본 논문에서는 RGB-stripe 부화소 구조를 갖는 디스플레이에서 인지 화질을 향상시키면서, 색 왜곡을 저감할 수 있는 부화소 렌더링을 수행한다. 우선 인지 화질을 향상 시키는 주 필터와, 색 왜곡을 억제하는 비음수 필터를 디자인한다. 색 왜곡 가능성의 계산에 따라, 두 필터를 조합하고 영상을 렌더링 한다. 실험 결과, 본 논문의 부화소 렌더링 방법이 비교 방법에 비해 좋은 인지 화질을 얻으면서도 색 왜곡을 억제함을 보여준다.

• Journal of Sericultural and Entomological Science
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• v.17 no.1
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• pp.31-34
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• 1975

This experiment was carried out to find out whether an electric-shock can hatch the diapause eggs or not. The results obtained are summarized as follows: 1. The electric-shock speeded up the embryonic development in diapausing eggs. 2. The higher hatchability was shown by the electric shock for five seconds. 3. The diapause eggs which had been treated with electric-shock and cold storage were hatched covering 15 to 22 days.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.107-109
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• 2017

HEVC 표준은 정수 화소로 표현된 신호에 DCT-II 를 기반으로 하는 보간 필터를 사용하여 부화소 신호를 생성한다. 움직임 보상 및 예측의 성능 향상을 위해서 부화소 신호를 생성하는 방법을 이용한다. HEVC 표준은 부화소를 각각 1/4-화소 단위로 생성을 하며, 부화소를 생성하기 위해서 길이가 다른 각각의 DCT 보간 필터를 사용하고 있다. 1/2-화소를 생성하는 경우에는 필터의 길이가 8 인 DCT 기반 보간 필터를 사용하며, 1/4-화소와 3/4-화소의 경우에는 필터의 길이가 7 인 DCT 기반 보간 필터를 사용한다. 본 논문에서는 DST-VII을 기반으로 하는 보간 필터를 제안하여, CTU-Level 단위로 RDO 과정을 통해 최적화된 보간 필터를 선택하여 사용한다. 본 논문에서 제안하는 방법은 HEVC 표준보다 BD-rate 가 Low Delay B 와 Random Access configurations 에서 각각 0.6%와 0.6%의 성능 향상을 가져오며 Low Delay P configuration 에서 0.5%의 성능감소를 보인다.

• KOREAN POULTRY JOURNAL
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• v.20 no.3 s.221
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• pp.113-115
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• 1988

수정란 속의 난황은 계태아가 자랄 때에 영양소 공급을 담당하며, 또한 초생추 부화후 몇일간 영양공급원이 된다. 초생추에서는 부화후 4-5일이면 난황내용물은 모두 병아리 몸속으로 흡수된다. 초생추때에 난황이 흡수되지 못하면 병아리는 약추가 되어 폐사가 증가한다.