• Journal of the Korean Society of Radiology
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• v.13 no.4
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• pp.495-502
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• 2019

A typical cerebrovascular disease among cerebrovascular diseases is vascular diseases such as cerebral infarction, cerebral hemorrhage, cerebral aneurysm, cerebrovascular stenosis. If the disease occurs and causes cerebral damage, it may be difficult to recover completely. So that, Must continue to perform health care through examination early. In particular, Because most cerebrovascular disease examining use radiation equipment and Thus this study was to find out how to select about the optimal examining method and X-ray dose decrease method among different examining method though comparison and analysis for the entrance surface dose (ESD) on cerebrovascular examining with Trance Femoral Cerebral angiography (TFCA) and Cerebral Computed Tomographic Angiography (CCTA). Also, want to find out how to select about the optimal examining method for worried patient that contrast medium side effect though measuring and evaluating for contrast usage. Data were collected from 70 patients (43 males and 27 females) who underwent CCTA at Yeosoo region hospital from June 2018 to December 2018 and 61 patients (34 males and 27 females) who underwent TFCA at Pyeongtaek region hospital from June 2018 to November 2018. ESD analysis method collected retrospective data though M-view and PACS PLUS program, Used contrast usage measuring method did reality measuring method. In the analysis using SPSS, the ESD of TFCA was $245.74{\pm}71.91$, which was $32.05{\pm}7.74$ lower than the dose of $277.79{\pm}79.65$ of CCTA ESD, and statistically significant at t = 3.249, p = 0.017 (p<0.05). As a result of the comparison of the total amount of contrast agent, the mean contrast agent used in TFCA was $55.05{\pm}17.68ml$, which was about 14.95 smaller than the amount of contrast agent used in CCTA, and statistically significant t = -4.548, p<0.001. In conclusion, the ESD of TFCA was statistically significantly lower than that of CCTA, and also the used contrast usage was significantly tiny than that of CCTA. Therefore, Select the method to increase the utilization of TFCA for cerebral disease examining, we can consider X-ray dose decrease method at the same time as to decrease side effect of contrast medium.

• Korean Chemical Engineering Research
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• v.50 no.6
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• pp.994-1001
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• 2012

The Effects of operating variables on reactivity of two $CO_2$ absorbents (PKM1-SU and P4-600) for SEWGS process were investigated in a pressurized fluidized bed reactor. For both $CO_2$ absorbents, $CO_2$ sorption capacity decreased as the number of absorption-regeneration cycles increased. PKM1-SU absorbent represented higher $CO_2$ sorption capacity than that of P4-600 absorbent. However, P4-600 absorbent represented better performance than PKM1-SU absorbent from the view points of regeneration temperature and regeneration rate. For PKM1-SU absorbent, $CO_2$ sorption capacity increased as the steam concentration increased. However, $CO_2$ sorption capacity increased initially as the steam concentration increased from 5% to 10%, but maintained thereafter for P4-600 absorbent. For both $CO_2$ absorbents, $CO_2$ sorption capacity increased as the final regeneration temperature increased. For PKM1-SU absorbent, $CO_2$ sorption capacity increased as the pressure increased and the increment tendency was drastic at higher pressure than 15 bar.

• Proceedings of the Korean Society of Food Hygiene and Safety Conference
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• 2004.11a
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• pp.42-49
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• 2004

본 연구는 선천선고혈압쥐(SHR)에서와 마찬가지로, 높은 정상혈압 및 중등 정도의 본태성고혈압 환자에서 Valyl-Tyrosine(VY)의 항고혈압 효과 여부를 결정하기 위해 수행되었다. 29명의 지원자에 대하여 무작위 이중맹검 위약검사를 실시하였으며, 3 mg의 VY를 포함하는 100-ml 음료와 100ml-위약 음료를 조제하여 사용하였다. 연구대상은 VY (남16/여1, 45.5${\pm}$3.2세, 146.4${\pm}$2.3/90.5${\pm}$1.8 mmHg) 집단과 위약(P) (남11/여1, 48.8${\pm}$3.0 세, 145.5${\pm}$2.4/92.3${\pm}$1.8 mmHg) 집단으로 나누었다. 대조(C)기간 3주 째에 VY-음료 또는 P-음료를 하루 2번씩 투여하기 시작하여 4주 간의 실험(E)기간(BP)은 매주 측정되었으며, 아침에 앉은 자세에서 측정하였다. 혈액 표본은 C기간과 E기간의 마지막 날 채취하였다. VY집단에서, 수축기(S) 및 이완기(D) 혈압의 감소는 첫째 주에 각각 9.7 및 5.3 mmHg (P < 0.001)이었으며, E기간의 시작에 따른 넷째 주에는 각각 9.3 및 5.2 mmHg (P < 0.001)이었다. P 집단에서는 SBP와 DBP 모두 변하지 않았다. VY 집단의 혈압은 회복기간의 끝까지 점진적으로 증가하였다. VY집단에서, 혈장 안지오텐신(Ang) I과 VY의 농도는 현저히 증가한 반면 Ang II와 알도스테론은 VY 투여 후에 현저히 감소하였다. VY는 SHR에서와 마찬가지로 중등 정도의 고혈압 환자에서도 Ang I-전환효소 억제를 통하여 현저한 항고혈압 효과를 가지는 것으로 보이며, 어떤 부작용도 검출되지 않았다.

• Journal of Bio-Environment Control
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• v.22 no.4
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• pp.309-315
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• 2013

Fruit drop is a serious problem in plum trees during fruit development after pollination and fertilization. In order to increase fruit yields, physiological fruit drop in plum trees at the early stages of fruit development must be reduced. In this study, the effect of gibberellic acid paste (GA paste 2.7%) applied on 'Formosa' plum was determined to reduce fruit drop. GA paste was applied one time on one set of the fruit stalk at 3 days after full bloom (DAFB), and on another set of the fruit stalk at 13 DAFB, and then the fruit-set rate was observed at 70 DAFB. GA paste application increased the fruit-set rate up to 61%. In 'Formosa', the time of GA application had a strong influence on reducing fruit drop. GA application increased the fruit-set rate up to 61% in treatments at 3 DAFB, and to 15% in treatments at 13 DAFB when the fruit-set rate was 5% in the control group. The same results were observed in 'Honey Red' and 'Akihime' plums. GA application impacted on fruit enlargement in the 'Formosa' cultivar, compared with the control trees, which had no GA application. The rate of fruit enlargement with GA application was similar to that of the control fruits until 70 DAFB, whereas the enlargement rate was slightly higher in the GAtreated trees than the control from 70 DAFB until harvest. In GA-treated fruit, fruit weight increased more than in the control, while total acidity and firmness was lower than in the control group. Additionally, GA application accelerated sucrose increase in maturing fruit. Our data indicated that GA paste application can reduce fruit drop, and subtly promote fruit enlargement and maturation in plum trees.

• Proceedings of the KSAR Conference
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• 2003.06a
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• pp.65-65
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• 2003

돼지 핵이식란의 발달은 다른 종의 것과 비교하여 효율이 낮다. 그 이유 중 하나가 난자활성화율이 낮기 때문이다. 따라서, 본 실험은 돼지 난자의 인위적 활성화처리에 따른 단위발생율을 조사함으로써, 이후 핵이식란 생산의 효율을 높이고자 수행되었다. 돼지 난포란을 10% pFF, 0.1mg/ml cysteine, 10IU/ml PMSG, 10IU/ml hCG, 10ng/ml EGF가 첨가된 TCM-199배양액에서 22시간 동안 배양한 후, 성선자극 호르몬이 배제된 배양액에서 추가로 22시간 동안 배양하여 성숙을 유도하였다. 체외성숙이 야기된 난자는 난구세포를 제거한 후 제2극체가 보이는 난자만을 선별하였다. 선별된 난자는 1)아무것도 처리하지 않은 대조군과 2)전기자극(2.0㎸/cm, 30$\mu\textrm{s}$), 2)7% ethanol에서 5분 배양 3)5$\mu$M ionomycin에서 4분 배양의 groups들로 나누어 활성화 처리 후 5분 동안 TCM-199에서 세정하고 다시 4시간 동안 6-DMAP에서 배양한 후 12시간에 난자를 염색하여 핵상을 분석하였고, 나머지는 4mg/ml BSA가 첨가된 NCSU-23에서 39$^{\circ}C$, 5%$CO_2$ 배양기에서 각각 6~7일 동안 배양을 실시하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.111.2-111.2
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• 2011

최근 지구온난화로 인해 국제적으로 이산화탄소 저감에 대한 연구가 진행되고 있으며 특히, 이산화탄소의 분리 및 유용물질 전환 등의 다양한 방법에 대한 연구가 활발히 이루어지고 있다. 이산화탄소를 메탄으로 전환시키는 생물학적 반응은 acetotrophic methanogen, hydrogenotrophic methanogen 등의 미생물이 관여한다. 본 연구에서는 hydrogenotrohpic methanogen을 이용하여 메탄으로 전환하고자 하였다. 이를 위해 이산화탄소와 수소의 체류시간에 대한 연구를 진행하였으며, 선행 연구로 혐기성슬러지의 혼합배양균으로부터 hydrogenotrophic methanogen을 우점종화 하기 위해 고정층 반응기를 이용하여 이산화탄소와 수소 가스를 주입하여 고농도로 배양하였다. 그 결과, 반응기내의 이산화탄소의 메탄전환 균주로써 수소를 환원제로 이용하는 hydrogenotrophic methanogen이 배양되었음을 확인하였다. 이산화탄소와 수소가스의 체류시간에 따른 이산화탄소의 생물학적 메탄 전환 실험 결과, 약 4시간에서 이산화탄소의 저감률이 99%이었으며, 체류시간이 2시간, 1.5시간인 경우 이산화탄소의 저감률은 각각 71%, 68% 이었다.

• Applied Chemistry for Engineering
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• v.8 no.4
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• pp.673-678
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• 1997

Associative acrylic thickeners were prepared by emulsion copolymerization using nonionic vinyl surfactant esters as an associative macromonomer and their rheological properties were investigated. The thickening efficiency was shown to depend on the chain length of therminal hydrophobe and degree of ethoxylation of VSE. increasing the content of VSE enhanced the efficiency of the resulting polymers as a thickener. It was attributed to the intermolecular association of terminal hydrophobes of associative thickener in aqueous solution. The chain transfer agent caused to reduce the molecular weight of associative thickener, resulted in decrease of thickening efficiency.

• Applied Chemistry for Engineering
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• v.8 no.4
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• pp.617-623
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• 1997

In this study, the mechanism on the phase behavior of polysorbate nonionic surfactants was investigated. In the ternary system containing water, hexanol as a polar oil and surfactant, the phase behaviors ranging from micellar region to occurrence of liquid crystal phase were observed by crossed microscope. As results, fine mosaic texture of liquid crystal phase and other phases were examined in the range of 20~70 wt%. This range if thought to give information about the basic data for the formulation of more stable emulsifying systems or dispersed systems. According to the alkyl chain length, three phase region diminished, whereas two phase range increased without an observation of the anisotropic liquid crystalline phase.

• The Korean Journal of Pesticide Science
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• v.9 no.1
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• pp.60-69
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• 2005

The herbicide molinate has been detected with high frequency in the main river during the growing season in Korea. To elucidate the exposure of molinate in agricultural environment, the persistence and the degradation characteristics of molinate were investigated in paddy ecosystems. The half-lives of molinate were 4.1 days with soil aquatic system, and 4.2 days in only aquatic system. Initial dissipation rate of molinate in water was greater with soil aquatic system than that of only aquatic system. Photolysis of molinate was occurred about 31.0% of molinate treated in pure water, when irradiated at 5,530 $J/cm^2$ by the xenon lamp, but its hydrolysis was stable. For the accelerated photolysis of molinate in aqueous solution, several photosensitizers were screened, showing that the hydroperoxide($H_2O_2$) and acetone were prominent among the chemical tested. When hydroperoxide and zinkoxide(ZnO) were used as photosensitizer, their photolysis were accelerated greater than 98% and 58% in aqueous solution, respectively. Elution rate of molinate as granular formulations in aqueous system was more than 90% in 30 hour at $35^{\circ}C$. Molinate concentration pattern in paddy water was rapidly decrease from treatment till 7 days in paddy rice field and its half-lives were 3.7 days($Y=1.9258{\times}e^{-0.1865X}$(r=-0.9402)).

• Korean journal of applied entomology
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• v.18 no.1 s.38
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• pp.55-61
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• 1979

Since rice high yielding practices with blast resistant varieties induced severe and earlier infestation of sheath blight recently, it is strongly suggested to spray at least 10 days earlier than the present recommendation and more than 2 sprays from early July to early August seems to be essential for the efficient control of sheath blight in the future. Among organo-arsenic fungicides, MAFe (Neo Asozin) is known as the most effective and economic as well as with the advantages of free phytotoxicity and safe residure on rice, and applications of the mixed formulation with other fungicide and insecticide is suitable for the one-hit control of rice diseases and insect pests in connection with cooperative mass control system. Present level of arsenic $(As_2O_3)$ residue in .ice is summarized as 0.2ppm to 0.65 ppm in highest average, and there are more possibilities of extensive MAFe fungicide uses for the efficient and economic control of this disease. During the past few years, the acreage of sheath blight control has been extended several times while the increase of the fungicides used for sheath blight showing about 10 times in quantity and mort than 15 times in amount, and also the fungicide cost estimated for the control is differ from 1 to 12 billion 1on by the use of MAFe or antibiotic fungicide in a year.