• Journal of Plant Biology
• /
• v.23 no.3_4
• /
• pp.85-90
• /
• 1980

The chemical affinities among 12 species of Viola from Jeju Island are investigated by thin-layer chromatography for their MeOH soluble and aglycon parts. They are classified into three groups which are closely related to those of morphological classification: the first allience-Viola hirtipes, V. chaerophylloides, V. meta-japonica, V. keiskei var. okuboi and V. violacea; the second allience-V. xanthopetala, V. ovata-oblonga, V. acuminata var. acuminata and V. grypoceras; and the third allience-V. pachyrhiza, V. phalacrocarpa and V. mandshurica var. ciliata. The first allience consists of the species without stem which have PA value greater than 50% with one another. V. hirtipes and V. chaerophylloides show closer affinity among the taxa of this allience. The second allience consists of the species with stem, of which PA value are about 50%. The third allience consists of the species without stem which have PA values lower than 50% when compared with any other taxa.

• Proceedings of the KIEE Conference
• /
• 2005.11b
• /
• pp.340-343
• /
• 2005

This paper is for studying the feasibility of SFCL application for the interconnection operation of 154kV power systems under 345kV S/S in Korean power system. All Korean 154kV power systems are constructed as loop systems in downtown. However, the present 154kV systems are operated with separated systems around 345kV S/S because of fault current and overload problems. In this study, we investigate the structure and operation of 154kV power system in Seoul and study the feasibility of interconnection operation of 154kV systems under 345kV systmes by applying SFCLs to 154kV bus-tie.

• Journal of Radiation Protection and Research
• /
• v.26 no.3
• /
• pp.315-319
• /
• 2001

It is shown, that both cosmic radiation (external source) and natural radioactive gases (inner source) are sources of neutrons near the Earth crust. Correlation between the Earth crust dynamics and variations of thermal and slow neutron flux near the Earth surface is studied. It is shown, that variations of neutron flux near the Earth crust can be used for short-term predicting of natural hazards.

• Journal of Industrial Technology
• /
• v.8
• /
• pp.13-21
• /
• 1988

For the improvement of productivity of Pleurotus ostreatus, the production of liquid spawn was studied. The highest liquid spawn production was obtained after shaking culture for 4 days in the culture medium containing 5%(W/V) wheat flour, 0.2%(W/V) yeast extract, 0.1%(W/V)$KNO_3$ 0.05% (W/V) $MgSO_4{\cdot}7H_2O$, 0.05%(W/V) $KH_2PO_4$. The optimum pH and temperature was 7.0 ana $30^{\circ}C$. The period required to complete the mycelial growth after spawning were 28, 22, 10 and 9 days, respectively, when the 2%(V/V) of solid spawn and 2%(V/V), 5% (V/V) and 10%(V/V) of liquid spawn were inoculated. The days required from spawning to fruiting bodies were 38, 34, 28 and 27 days.

• The Bulletin of The Korean Astronomical Society
• /
• v.38 no.1
• /
• pp.57.1-57.1
• /
• 2013

Non-LTE 항성대기모형인 Tlusty 모형의 합성색지수와 성간소광을 매우 적게 받은 산개성단에 있는 별들의 색지수를 바탕으로 O와 B형 별의 고유색지수 관계를 채택하였다. 태양인근 3kpc 내에 있는 약 190개 젊은 산개성단의 가시광 및 근적외선 2MASS JHKs 관측자료와 위에서 채택한 고유 색지수 관계를 적용하여 색 초과비 E(V-I)/E(B-V), E(V-J)/E(B-V), E(V-H)/E(B-V), 및 E(V-Ks)/E(B-V)를 얻고, 색 초과비와 $R_V$의 관계를 사용하여, 각 성단의 성간소광법칙 $R_V$를 결정하였다. 국부 나선팔의 백조자리 방향과 Per 나선팔에 있는 산개성단들은 약간 작은 $R_V$를 보이며, 큰개자리 방향의 국부 나선팔에 있는 산개성단은 정상적인$R_V$를, 그리고 Sgr-Car 나선팔에 있는 산개성단들은 약간 큰 값을 보였다. 이 결과는 최대 편광도를 보이는 파장과 $R_V$의 관계로 얻을 수 있는 양상과 잘 일치한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2004.05b
• /
• pp.661-663
• /
• 2004

In this paper, we have investigated characteristics of C-V for double gate MOSFET with main gate and side gate by the variation of side sate length and side gate voltage. Main gate voltage is changed from -5V to +5V. We know that characteristics of C-V is good under the condition of LSG=70nm, VSG=3V, VD=2V. We have analyze characteristics of device by ISE-TCAD.

• Journal of the Microelectronics and Packaging Society
• /
• v.10 no.4
• /
• pp.9-14
• /
• 2003

The new optical link receiver with data transfer rate higher than 10Mbps at the supply voltage of 1.8V was designed and fabricated using bipolar technology. The fabricated IC showed the dissipation current of 4.6mA under high level input voltage of 1.5V. The high level output voltage($V_{OH}$) and the low level output voltage($V_{OL}$) were 1.15V and 0V, respectively, for a given 10 Mbps signal which has duty ratio of 50%, $V_{IL}$(low level input voltage) of 0.5V, and $V_{IH}$(high level input voltage) of 1.5V, The duty ratio of output waveform was 52.6%. The rising time(t$_{r}$) and the falling time(t$_{f}$) were 9.5ns and 6.8ns, respectively. The propagation delay difference($t_{PHC}-t_{PLH}$) and the jitter($t_j$) were 11.7ns and 4.3ns, respectively.y.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.11 no.4
• /
• pp.114-119
• /
• 2003

The fermentative conversion of food wastes into probiotic feed was investigated by seeding of mixed inoculum of Lactobacillus acidophilus and Saccharomyces cerevisiae. After grinding finely, optimal fermentation conditions for aeration was investigated at $30^{\circ}C$, The viable cell count of lactic acid bacteria and yeast during fermentation were monitored by controlling aeration rate at each different aeration degree of 0v.v.m 0rpm, 0.25v.v.m 100rpm, 0.5v.v.m 200rpm, and 1v.v.m 500rpm respectively. The most active growth of the yeast was shown at 0.5v.v.m 200rpm as $4.5{\times}10^9CFU/m{\ell}$. By controlling aeration rate, the pH of the probiotics feed could be controlled between 4-5 for the enhancement of preservation characteristics and acceptability for cattle feeding.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.11 no.1
• /
• pp.29-36
• /
• 2016

Recently a new class of quantum gate called $NCV-{\mid}v_1$ > library with low cost realizable potentialities is being watched with keen interest. The $NCV-{\mid}v_1$ > MCT gate is composed of AND cascaded-$CV-{\mid}v_1$ > gates to control the target qudit and its adjoint gates to erase junk ones. This paper presents a new symmetrical duality library named $NCV^{\dag}-{\mid}v_1$ > library corresponding to $NCV-{\mid}v_1$ > library. The new $NCV^{\dag}-{\mid}v_1$ > library can be operated on OR logic under certain conditions. By using both the $NCV-{\mid}v_1$ > and $NCV^{\dag}-{\mid}v_1$ > libraries it is possible to realize MPMCT gates, SOP and POS type synthesis of quantum logic circuits with extremely low cost, and expect dual gate property caused by different operational attributes with respect to forward and backward operations.

• JSTS:Journal of Semiconductor Technology and Science
• /
• v.15 no.5
• /
• pp.519-525
• /
• 2015

Positive bias stress-induced instability in amorphous indium-gallium-zinc-oxide (a-IGZO) bottom-gate thin-film transistors (TFTs) was investigated under high $V_{GS}$/low $V_{DS}$ and low $V_{GS}$/high $V_{DS}$ stress conditions through incorporating a forward/reverse $V_{GS}$ sweep and a low/high $V_{DS}$ read-out conditions. Our results showed that the electron trapping into the gate insulator dominantly occurs when high $V_{GS}$/low $V_{DS}$ stress is applied. On the other hand, when low $V_{GS}$/high $V_{DS}$ stress is applied, it was found that holes are uniformly trapped into the etch stopper and electrons are locally trapped into the gate insulator simultaneously. During a recovery after the high $V_{GS}$/low $V_{DS}$ stress, the trapped electrons were detrapped from the gate insulator. In the case of recovery after the low $V_{GS}$/high $V_{DS}$ stress, it was observed that the electrons in the gate insulator diffuse to a direction toward the source electrode and the holes were detrapped to out of the etch stopper. Also, we found that the potential profile in the a-IGZO bottom-gate TFT becomes complicatedly modulated during the positive $V_{GS}/V_{DS}$ stress and the recovery causing various threshold voltages and subthreshold swings under various read-out conditions, and this modulation needs to be fully considered in the design of oxide TFT-based active matrix organic light emitting diode display backplane.