• Applied Biological Chemistry
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• v.46 no.3
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• pp.257-261
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• 2003

Chemical components relevant to the characteristic antimicrobial activities of the Korean chestnut (Castanea crenata S. et Z.) leaves and flowers were analyzed. The composition of free sugar were sucrose, maltose in the chestnut flowers and sucrose, glucose, fructose in the chestnut leaves. The contains of tannin were 0.16% in the chestnut flower and 1.98% in the chestnut leaves. In fatty acids case, the linoleic contents were significantly high in the chestnut leaves and flowers. The organic acids showed high composition to succnic and citric acid in the chestnut leaves. The ammo acid compositions showed high contents to aspatic acid, proline, glutamic acid, glycine and methionine in the chestnut leaves and flowers. The total amino acid showed significantly higher in the chestnut leaves than flowers. The major minerals contained in the chestnut leaves and flowers were K, Ca, Ng, Fe, Mn and Al. Ascorbic acids were detected highly in the chestnut leaves and flowers.

• Proceedings of the Korean Society of Food and Cookery Science Conference
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• 2003.10a
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• pp.100-100
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• 2003

홍화꽃의 식품재료적 가치를 높이는 기초적 연구의 일환으로 한국산과 중국산의 화학적성분을 비교분석한 결과는 다음과 같다. 홍화꽃의 일반성분은 한국산 홍화꽃의 조단백질, 조지방, 조회분, 조섬유, 무질소물의 함량이 14.70%, 3.10%, 6.90%, 18.20%, 57.10%이었으며 중국산 홍화꽃은 12.60%, 2.70%, 5.80%, 16.40%, 62.50%로 나타나 무기질소물을 제외하고 한국산 홍화꽃이 중국산 홍화꽃보다 높게 나타났다. (중략)

• Resources Recycling
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• v.6 no.1
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• pp.35-39
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• 1997

This study was carried out to find the existing forms of chlorlnc in EM dust and to understand the valaliliratian behavior and the removal of chlorine from EAF dust with lemperalure and heating almosphere The chemical compositions of dust A are 27.3%Fe. 21.8%3Zn, 3 15%Pb, 3 51%C1 and that of dust B BE 33.92%Fe, 15.94%Zn, 2.73% Pb, 3.98%Cl. The XRD analysis and water leaching test shows that chlorlne in EM dust exist mainly as NaCI, KCI, Pb (0H)Cl. Above 99% of chlorine was volatilized when dust was hentcd in alr atmosphere at 1100$^{\circ}$C h r 1 hour and that was 96% when heated in reduction atmosnherc at 1100$^{\circ}$C for 1 hour.

• Applied Chemistry for Engineering
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• v.30 no.5
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• pp.556-561
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• 2019

In this study, the physical and chemical analyses of petroleum residues (pyrolized fuel oil, PFO) were conducted and major components were selected to investigate their fire and explosion characteristics. Major component distribution areas of the PFO were identified via the GC-SIMDIS and MALDI-TOF analyses. In addition, the qualitative analysis of major component distribution areas was performed by GC-MS analysis. Major components of pyrolysis residue were selected based on the results of various analyses such as EA, SARA and TGA. As a result, benzene, toluene and xylene were selected as major components. Finally, the process hazard analysis software tool (PHAST) analysis was performed to investigate the range of maximum damage effect in case of fire and explosion. Toluene presented the highest risk due to the radiation effect of $227kW/m^2$ and 118 m in the case of jet fire. Xylene and benzene showed the maximum radiant heat values of 114 and $151kW/m^2$, respectively. It was also confirmed from the analysis of pasquill stability and wind speed that the radiant heat increased up to 55% according to wind speed in benzene, which was considered to be a main factor increasing the influence range.

• Journal of the Korean Chemical Society
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• v.42 no.3
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• pp.251-265
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• 1998

Punch'ong and whiteware sherds excavated from four kilns located in Ch'unghyodong, Kwangju, Chollanamdo were analyzed for their body and glaze composition. They are classified into eight different groups by the site and layer from which they were collected. In principal component analysis of major composition, the punch'ong body separates out into several different groups. CHE2, made in early fifteenth century, has a higher aluminum and lower iron content compared to the later groups of lower grade. Whiteware body has a very high aluminum content of around 30 wt. in both soft type and hard type. Punch'ong glaze was determined to be lime type and whiteware alkali-lime type.

• Journal of the Korean Geotechnical Society
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• v.16 no.6
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• pp.51-58
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• 2000

울산지역에 널리 분포하고 있는 해성 퇴적토에 대하여 깊이별로 물리, 화학 그리고 광물학적 특성을 파악하였으며, 이 지역에서 채취된 시료에 대하여 깊이별로 퓨준압말시험을 실시하였다. 본 논문을 위하여 울산 해성 퇴적토의 생성과정을 추정하고, X-선 회절 분석, X-선 형광분석 및 에너지분산분광분석을 실시하여 깊이에 따른 변화를 비교하였다. 울산 해성 퇴적토의 점토광물에 대한 정량분석결과, 일라이트, 카올리나이트, 녹니석, 스멕타이트 순으로 많게 나타났음, 화학성분 분석결과, SiO$_2$, $Al_2$O$_3$그리고 Fe$_2$O$_3$가 대부분을 차지하는 것으로 나타났다. 주사전자현미경 관찰결과, 유공충과 규조류가 관찰되었다. 표준압밀시험 결과, 울산지역의 해성 퇴적 점토는 깊이에 따른 변형거동이 화학적, 광물학적 분석결과와 마찬가지로 깊이에 따른 변화를 보이지 않아 같은 시디에 퇴적인 것으로 판단된다.

• Korean Journal of Plant Resources
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• v.30 no.2
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• pp.240-264
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• 2017

The present study was carried out to identify traditional konwledges on Korean Campanulaceae plants and conduct a comprehensive review of them through analyzing phytochemistry and pharmacology of Korean Campanulaceae plants. According to the literature study, the ethnobotanical plants of Korean Campanulacae consisted of a total 18 taxa. Of them, 12 taxa including Platycodon grandiflorus, Adenophora triphylla var. japonica, Codonopsis lanceolata and others have been used as ethnomedicinal plants. These plants have been used for the treatment of 49 diseases such as cold, asthma and postnatal care. Phytochemical studies have identified the constituents present from Korean Campanulaceae (Adenophora, Codonopsis, Platycodon, Campanula and Asyneuma). A wide range of chemical compounds comprised 109 triterpenes, 8 sterols, 4 polyacetylenes, 21 alkaloids, 14 flavonoids, 14 phenolic acids, 11 phenolic glycosides, 8 phenylpropanoids and 22 other compounds. Pharmacological studies of these compounds have demonstrated immuno-stimulating, anti-inflammatory, anti-asthmatic, apophlegmatic and anti-allergic effects. They have also shown antioxidant, estrogenic, anti-diabetic, hepatoprotective, neuroprotective, antinociception and anti-tumor activities, as well as anti-obesity and cardiovascular effects. In light of traditional knowledge and phytochemical and pharmacological studies summarized, uses of Korean Campanulaceae based on traditional knowledge (for the treatment diseases and conditions of respiratory, pregnancy, childbirth, puerperium, genitourinary, circulatory, musculoskeletal and other systems) have been supported by phytochemical and pharmacological studies.

• Analytical Science and Technology
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• v.21 no.2
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• pp.65-83
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• 2008

It is noted that illegal hazardous foods containing unauthorized drugs or synthetic drung analogues are increasing. Especially, reported are unknown compounds that have the modified chemical structures of the anti-impotence drugs such as sildenafil, vardenafil, and tatalafil. In addition, it is very reserved, since illegal synthetic compounds having similar chemical structures modified from anti-impotence drug to avoid the government inspection are not proved their safety at all. This review in ulation to food safety, lists the illegal compounds added to foods and describes about the analytical methods to chanacterize 16 anti-impotence drug analogues such as homosildenafil, hongdenafil, pseudovardenafil, aminotadalafil, hydroxyhomosildenafil, hydroxyhongdenafil, dimethylsildenafil, xanthoanthrafil, hydroxyvardenafil, norneosildenafil, demethylhongdenafil, piperidinohongdenafil, carbodenafil, thiosildenafil, dimethylthiosildenafil, and acetylvardenafil.

• The Journal of Engineering Geology
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• v.28 no.3
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• pp.501-512
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• 2018

The acid leachate derived from the sulfide mineral such as pyrite can cause problems such as aging of infrastructure and environment contamination around the civil construction site. The purpose of this study is to assess the environmental effect of an acid leachate derived from pyrite in the Miryang area under road construction. In this study, 13 samples of situ core were used for the net acid generation (NAG) experiment. The chemical composition including pH, oxidation and reduction potential (ORP) and electrical conductance of water samples produced from the NAG test was analyzed. In additional, five polished thin sections of rock cores were made for electro microprobe analyses. In the results of the NAG tests, 7 samples showed lower values than pH 3.5. It strongly indicated that these areas are under the environmental and infrastructure damage by the acid leachate. The chemical type of the 7 samples was classified as the $Fe(Ca)-SO_4$ type, which is totally a different type compared to general groundwater. The concentration of total sulfur ranges from 0.004% to 12.5%. 6 rock samples are plotted on a potentially acid forming zone in the relation diagram between the total sulfide and NAG-pH. In conclusion, it is suggested that a protection method against an environmental demage and an infrastructure corrosions by the acid leachate should be prepared in all of areas under a road construction.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2003.05a
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• pp.94-97
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• 2003

본 연구에서는 반도체제조에 필수적으로 사용되는 플라즈마장비의 성능을 예측.분석하여 개발 시간 및 비용의 절감과 장비의 성능을 극대화 할 수 있도록 이론적 전산모사 환경(VIP-SEPCAD)을 개발하고 있다. VIP-SEPCAD는 플라즈마의 물리.화학적 특성을 예측하는 plasma model, 중성화학종들의 반응 및 유돈 특성을 예측하는 neutral reaction-transport model, particle의 유동 특성을 예측하는 particle transport model, particle의 생성 및 성장 특성을 예측하는 particle formation-growth model, 식각 또는 증착되는 웨이퍼 표면변화를 예측하는 surface evolution model로 구성되어 있다. 현재 개발된 VIP-SEPCAD를 이용하여 산소 플라즈마의 특성과 각종 화학성분들의 분포를 예측하고 particle의 거동에 대하여 분석하였다.