• Korean Journal of Crystallography
• /
• v.9 no.2
• /
• pp.159-167
• /
• 1998

천연에서 발견되는 유색수정은 자수정, 연수정, 황수정, 청수정, 녹수정, 장미수정 등 그 색의 종류에 따라 크게 6가지로 분류되며 발색 기구에 따라 색중심(color center), 전이금속 불순물(transition metal impurity), 산란(scattering), 전하이동(charge transfer) 등 4가지로 분류된다. 이들은 천연에서 고온고압의 열수가 냉각되면서 그 안아 녹아있던 광물질이 재결정하여 생성된 것이다. 이러한 유색수정은 실험실에서도 합성되며 그 방법은 천연 수정의 생성 과정과 유사하다. 그러나 천연수정 중의 일부는 실험실에서 성장하기가 거의 불가능하기 때문에 다른 방법을 이용하여 유사한 색을 가지게 한다. 본 논문에서는 불순물 원소의 종류 및 수정 격자내의 위치, 최외각 전자의 상태에 따라 색이 달라지는 것을 고찰하고 이러한 유색수정을 합성하는 원리에 대하여 논하고자 한다.

• YAKHAK HOEJI
• /
• v.40 no.2
• /
• pp.225-229
• /
• 1996

The cytotoixic effect of Pylorae Herba (Pyrola japonica Klenze) against L1210 and K-562 cells was studied in vitro. The methanolic extract of Pylorae Radix was add ed to the culture of L1210 cells and K-562 cells for the cytotoxic activity and the ED50 values of hexane, ethylacetate, buthanol and water fractions from methanolic extract were determined using MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazoliumbromide) assay. The active constituent isolated by bioassay guided fractionation followed by purification gave rise to a yellow needle crystal and was clarified to be chimaphilline by the comparison with the published data. The average life spans with it were not prolonged significantly on tumor growth in hybrid female mouse (BDF1-KIST) inoculated subcutaneously with P388 cells.

• Journal of Ocean Engineering and Technology
• /
• v.29 no.4
• /
• pp.300-308
• /
• 2015

With the increases in oil and gas prices, and energy consumption, drillship construction has increased during the last decade. A drillship using a dynamic positioning (DP) system to maintain its position and heading angle during drilling operations. In addition, a drillship is equipped with a moonpool structure to allow its drilling systems to be operated in the midship section. A drillship for the North Sea is specially designed to endure harsh environmental loads. For safe operation in the North Sea, the drillship should have good motion response and robust hull strength. A break water should be considered on the bow and side deck to prevent the green water on deck phenomenon from incoming waves. In addition, the moonpool should be designed to reduce the speed loss and resonance motion. In this study, the hydrodynamic characteristics of a drillship for the North Sea were examined in relation to the motion, wave loads, green water, and moonpool resonance in the initial design stage.

• The Journal of the Convergence on Culture Technology
• /
• v.5 no.2
• /
• pp.299-303
• /
• 2019

This study is one of the preparatory tasks for this researcher to do Emotion Coding on AI. This time, we're doing an Emotion Coding for Sijo "Blue Mountain is My Meaning" by Hwang Jin-yi. Huang Jin-yi is doing Emotion Coding on Blue Mountain and Green Stream in this Sijo. These Emotions code, as seen in Emotion Codon, as in UUU. This phenomenon can be described in the form in which this researcher hypothesized. In other words, this Emotion Coding acts as a catalyst for the formation of an amino acid called phenylalanine. If we continue this research, it is thought that the function of literature, which is more healing, will be utilized in the future of mankind.

• Horticultural Science & Technology
• /
• v.17 no.3
• /
• pp.346-351
• /
• 1999

According to their flower color and the shape of petal, sepal, and lip, Calanthe species native to Cheju Island are named as follows; 'Arang', 'Cheongsu', 'Sara', 'Aeyeol', 'Darigot', 'Saebaengi', 'Andeok', 'Setbyeol', 'Kyorae', 'Jasujeong', 'Baekrok', 'Seokwang', 'Deokcheon', 'Seonheul', 'Saechimi', 'Jokduri', 'Baedal', 'Noksu', 'Noeul', and 'Dansim for 20 cultivars of Calanthe discolor; 'Hwanghee', 'Waheul', 'Illchool', 'Hwangryong', 'Dabo', 'Hwangjinee', 'Daeha', 'Chwikwang', 'Seokyang', 'Eunpa', 'Chwiseon', 'Sinbaram', 'Ara', 'Dano', 'Pakae', and 'Sojeob' for 16 cultivars of Calanthe sieboldii; 'Dongkwang', 'Myeongdeok', 'Wangdolseon', 'Myeongryeok', 'Kwibuin', 'Semi', 'Cheonwangsa', 'Mandeok', 'Seolmundae', 'Kyeongok', 'Darangsi', 'Byeolbang', 'Honghak', 'Dongbaeksan', 'Chejudo', 'Samda', 'Kwandeok', 'Youngjusan', 'Tamra', 'Koyeongdi', 'Yongduam', and 'Jeolbuam' for 22 cultivars of Calanthe bicolor.

• Korean journal of applied entomology
• /
• v.60 no.2
• /
• pp.229-234
• /
• 2021

This study investigated spray patterns and coverage generated by three types of commercial nozzles for spraying pesticides with Unmanned Aerial Vehicles (UAVs) using a multi-copter. Flufenoxuron+metaflumizone SC and bifenthrin EC were sprayed. The falling particles of the spraying agent were measured using WSP (Water and oil Sensitive Paper) and the coverage was determined. The results showed that the uniformity of falling particles was different according to the difference in wind strength, and there was no difference for different formulations. The injection amount for each nozzle was found to be different from the official information provided by the manufacturers. These results could be used to establish guidelines for the control of UAVs and pesticide registration testing.

• Journal of Korean Society of Forest Science
• /
• v.89 no.5
• /
• pp.685-690
• /
• 2000

Caliroa carinata (Zombori) has heavily damaged the forests of Quercus mongolica in Sangju, Kyongbuk, Korea since 1996. However, information on the ecology and control of this pest was badly scarce. Thus we tried to study the ecology and chemical control of the sawfly through this study. Caliroa carinata is one generation per year. The adult sawflies emerged from June 8 to July 5 with peak at June 18. A female adult laid 11 eggs in rows on the backside of a leaf along the midribs and larger veins. Larvae have six instars, and the developmental period required to complete the larval stage was 19 days and 17 days at temperatures of $20^{\circ}C$ and $25^{\circ}C$, respectively. Each larval stage required 2-4 days to complete the development. The sawfly mostly preferred Quercus mongolica and Q. dentata, while avoiding Q. variabilis. Such insecticides as Tebufenozide, Flufenoxuron, Etofenprox, and Fenitrothion were sprayed on host plant leaves infected with test larvae in order to study the mortality. After 3 days of insecticide treatments, the mortalities were thoroughly examined. All insecticides showed higher than 95% of mortalities. Control values were also higher than 93%. The optimal season of insecticide application for pest control was estimated from late June to early July.

• Korean Journal of Food Science and Technology
• /
• v.54 no.2
• /
• pp.218-223
• /
• 2022

This study, conducted during 2018-2021 in Gangseo, Seoul, monitored residual pesticides in 14 types of fresh-cut produce, including lettuce, tomato, and celery, in wholesale market and supermarkets. A total of 589 cases (2.9%) were inspected; 17 cases (2.9%) were detected within the criteria, and 2 cases (0.3%) exceeded the maximum residual limit (MRL). When assessing the distribution stage of the pesticide violation, there were two violations in the wholesale market (before distribution), which differed from the supermarkets (during distribution). The detected pesticides, mainly insecticides and fungicides, appeared in the order of flubendiamide, flufenoxuron, and diazinon. A violation rate of 0.3% was found for wholesale market, which is collection area dedicated to fresh-cut produce, and this was lower than that for general agricultural products (1.4-2.5%). Since fresh-cut produce are consumed immediately after simple processing, residual pesticides significantly affect the human body; therefore, continuous monitoring of pesticide residues is required.