석영과 장석의 Zeta 전위에 있어서 금속이온의 영향

오재현,박광원,이원해,원덕환 대한금속재료학회(대한금속학회) 1974 대한금속·재료학회지 Vol.12 No.4

石英과 長石의 活性化에 關한 資料를 얻기 爲해서 水溶液中 Mg^(++), Cu^(++), Zn^(++)과 Al^(+++)를 添加하여 鑛粒의 Zeta 電位를 測定하였다. 그리고 이들 鑛粒의 界面電氣現象과 金屬이온들의 加水分解特性을 서로 關聯시켜 比較 檢討하여 다음과 같은 結論을 얻었다. 1. 水溶液中에 金屬이온이 存在할 때 長石의 界面電氣現象은 石英과 같다. 2. 金屬이온種의 吸着으로 因해 石英과 長石의 界面은 陽(+)으로 荷電된다. 그리고 陽으로 荷電되는 pH 範圍는 金屬이온의 種類에 따라 다르다. 3. 水溶液中에 金屬이온들이 存在하면 鑛粒의 zpc(Zero point of charge)는 두 곳의 pH에서 나타난다. 두개의 zpc 중 하나의 zpc가 나타나는 pH는 M^(II)OH^+, M^(III)(OH)^+_2 및 M^(III)(OH)^(++) 이온種의 最高濃度가 나타나는 pH와 거의 一致한다. 마그네슘 이온의 경우에는 pH 10.1에서 단하나의 zpc가 나타난다. 4. Mg(II), Cu(II), Zn(II) 및 Al(III) 이온들의 加水分解特性과 zeta 電位를 關聯시켜 볼 때 Mg^(++), Cu^(++), Zn^(++) 및 Al^(+++)은 鑛粒表面에 對해 吸着力이 弱하고, 한편 M^(II)(OH)^+, M^(III)(OH)^+_2 및 M^(III)(OH)^(++) 이온種은 吸着力이 强함을 알 수 있다. To obtain a better understanding of quartz and orthoclase activation, zeta potentials of the minerals were studied in the presence of metallic ions such as Mg^(++), Cu^(++), Zn^(++) and Al^(+++). A microelectrophoresis technique has been used to measure the zeta potential, and the results have been correlated with the hydrolysis of the metallic ions in the solution. The experimental results have led to the following conclusions. 1. Zeta potentials of orthoclase in the presence of the metallic ions show a similar behavior to those of quartz. 2. Adsorption of the metallic ions renders the zeta potential of quartz and orthoclase positive. The pH range of positive zeta potential varies with the kind of cation. 3. Zero point of charge(ZPC) of the mineral surface in the presence of metallic ions appears at two different pH of solution. One of two pH of ZPC is consistent with the pH at which M^(II)(OH)^+ and M^(III)(OH)^+_2 or M^(III)(OH)^(++) species are predominant. 4. Comparison of the zeta potential data with the hydrolysis for Mg(II), Cu(II), Zn(II) and Al(III) species suggests that Mg^(++), Cu^(++), Zn^(++) and Al^(+++) are only weakly adsorbed at the mineral surface and that M^(II)(OH)^+ and M^(III)(OH)^+_2 or M^(III)(OH)^(++) are the main metallic ionic species adsorbed.

Ten-Two mechanics에 의한 고정원 준비시 하악구치와 전치 주위조직의 응력 분포에 관한 광탄성법적 분석

오준기,성재현 慶北大學校 齒科大學 1992 慶北齒大論文集 Vol.9 No.1

하악의 고정원 형성시 Ten-Two mechanics을 사용할때 하악구치와 하악전치의 치근 주위조직에 미치는 영향을 평가하기 위하여, 제1소구치 발치 증례에서 평준화와 전치부의 견인이 끝난 에폭시모형을 제작하였다. 에폭시모형상상에서 Ten-Two mechanics와 high pull J-hook headgear를 사용하여 준비고정한 것과 Ⅲ급 고무로 준비고정 하였을 때, 하악구치와 전치 주위조직에 나타난 응력 분포 상태를 광탄성법으로 비교 분석하여 다음과 같은 결과를 얻었다. · Ⅲ급 고무를 사용시, 하악 구치부에 후방경사이동 양상이 전반적으로 나타났으며, 전치부에는 압입의 양상이 상당히 나타났다. · 10-2-7 mechanics와 high pull J-hook headger를 사용시, 하악 제2대구치에 후방경사이동 양상이 나타났고, 전치부에는 거의 압입의 양상이 나타나지 않았다. · 10-2-6 mechanics와 high pull J-hook headger를 사용시, 하악 제1대구치에 후방경사이동 양상이 나타났고, 전치부에는 거의 압입의 양상이 나타나지 않았다. · 10-2-5 mechanics와 high pull J-hook headger를 사용시, 하악 제2소구치에 후방경사이동 양상이 나타났고, 전치부에는 거의 압입의 양상이 나타나지 않았다. This study was performed to analyze the effects of Ten-Two mechanics applied to prepare mandibular anchorage on the surrounding tissues of the mandibular molars and incisors. The photoelastic model was constructed as the premolar extraction case which leveling and retraction of anteriors were finished. In this epoxy resin model, mandibular anchorage was prepared by two methods, that was Ten-Two mechanics with high pull J-hook headgear and Class Ⅲ elastics. The obtained stress distribution on the surrounding tissues of the roots was analyzed by photoealstic method. The results were as follows: 1. When Class Ⅲ elastics were used in preparing mandibular anchorage, distal tipping movement tendency occurred overally in the madibular molars and considerable intrusion occurred in the incisors. 2. When 10-2-7 mechanics with high pull J-hook headgear used in preparing mandibular anchorage, distal tipping movement tendency occurred in the mandibular second molar and the least intrusion occurred in the incisors. 3. When 10-2-6 mechanics with high pull J-hook headgear used in preparing mandibular anchorage, distal tipping movement tendency occurred in the mandibular first molar and the least intrusion occurred in the incisors. 4. When 10-2-5 mechanics with high pull J-hook headgear used in preparing mandibular anchorage, distal tipping movement tendency occurred in the mandibular second premolar and the least intrusion occurred in the incisors.

광주광역시 도시공간구조 변화에 관한 연구

오재화,김우혁,김현웅 朝鮮大學校 建設技術硏究所 2002 建設技術硏究 Vol.22 No.1

The purpose of this thesis is to inspect the step of spatial structure varied with the urban growth in place of Kwang-ju, to analyze the developing step of urban growth on the basis of the variety of shape-index and function-index on urban from 1930 to 1992 each year, to predict the variety direction of urban spatial structure for the concentrating and efficient urban function and to grope for the prospects of urban : what is the municipal concept in the land use, the variety of population, the change of traffic system, the change of urban planning zone, the change of executive zone, the transition of spatial structure on the basis of urban growth in Kwangiu. Considering the advent of subway in 1990, Pyoung-Dong industrial block, to work out these factors, the urban pattern in Kwangiu would be developed and established in aspect of long-range planning. The size of population, the changing pattern of land use planning and zonning are compared and analyzed to justify the relation with the urban comprehensive planning circulation planning.

이동 애드 혹 네트워크에서 QoS를 지원하는 AODV 라우팅 프로토콜

吳世德,趙榮泰,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance victor routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end point is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average date reception rate. At that time, we used evaluation parameters such as node's mobility -stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.3% for 0 mobility-stop second case and 4.7% for 300 mobility-stop second case.

복강경을 이용한 대장 부분 절제 시행 1예

박재갑,서경석,정회원,김선회,오용석,송인성,박용현 대한대장항문학회 1993 Annals of Coloproctolgy Vol.9 No.1

스파이럴형 박막 공심 인덕터의 제조와 특성

오영우,김현식,송재성 경남대학교 신소재연구소 1997 論文集 Vol.8 No.-

마이크로 자기소자중 가장 간단한 형태인 스파이럴형 박막 공심 인덕터의 제작 및 특성 평가에 관해 연구하였다. 간단한 습식 식각공정으로 두께 12μm, 폭 수십 μm 정도의 코일 패턴을 제작할 수 있었으며, 양호한 미세 패턴을 얻었고, 마이크로 스트립 선로로 제작한 측정 zig로 비교적 정확한 특성을 측정할 수 있었다. 또한, 크기가 10×10mm, 선폭 300μm, 선 간격 70μm, 턴수 12인 스파이럴 코일형 공심 인덕터의 공진 주파수는 300MHz였고, 성능지수는 4 이었다. Recently the development of electronic machine industries have been miniature of size as well as increasement of driving frequency in electronic parts. In this study, we fabricated thin film inductors by using thin films manufacturing techniques such as photolithograghy and wet etching process, and the properties of these devices are measured at high frequency range of 1 MHz∼1 GHz. The accurate measuring technique by using network analyzer system having microstrip line was established. The inductors are fabricated with several ten micrometers by means of wet etching process known as easier and more economic than dry etching process. The properties of spiral-type thin film air core inductors with Wc = 300μm, dc = 70μm, number of turns = 10. and t_{cu} = 12μm were found to have Q of 4. L of 50nH at 300MHz and f_{R} of 300MHz.

濕式法에 依한 輝安鑛으로부터 三酸化 안티모니의 製造에 關하여

오재현,김준수,고인용,정원용 연세대학교 산업기술연구소 1979 논문집 Vol.11 No.1

An investigation on the production of high purity Sb₂O₃was carried out by means of the acid leaching process from the roasted ore of stibnite. The approach of these studies has been to investigate purity, particle size, recovery and crystal structure of Sb₂O₃obtained through the subsequent treatments of leaching, hydrolysis and neutralization under various conditions. The results obtained in these experiments are summarized as follows; 1) It was possible to use dilute hydrochloric acid to extract Sb₂O₃from the roasted stibnite. Because of the prior roasting treatment, the contamination of impurities could also be reduced in the final products. 2) The rate of extraction of Sb₂O₃from the roasted stibnite was increased concentration of hydro-chloric acid as increased amount of addition of the acid. 3) The yield of Sb₂O₃obtained by hydrolysis of SbCl₃was increased with increasing temperature of hydrolysis. 4) The crystal structure of Sb₂O₃obtained by hydrolysis of SbCl₃at 20℃(room temperature) was confirmed as a orthorhombic crystal structure which is the same as that of valentinite. The recovery of Sb₂O₃from the roasted ore appeared to be nearly 100% under optimum conditions.

PEM을 이용한 連續基礎의 支持力에 대한 信賴度 解析

吳秉炫,羅德寬,朱宰佑 순천대학교 공업기술연구소 1994 工業技術硏究所論文集 Vol.8 No.-

The reliability analysis are performed for the bearing capacity of strip foundation using the point estimate method. The measure of the safety of structure is expressed in terms of the probability of failure instead of the conventional factor of safety. The analysis of the uncertainties around input parameter which is involved soil, site and loading condition introduce a measurable uncertainty on the prediction of bearing capacity of strip foundation. Both the soil properties and loads are assumed to be probability variables, and considered correlations of each variated. And as expected, the difference in the probability of failure of bearing between beta and normal distribution seems to be insignificant for practical use but the probability of failure by the given value of the correlation of each variable is more sensitive than that of not to be considered case. If probabilistic analysis techniques are to be adopted, it will be necessary to develop probability based tolerable bearing capacity criteria.

토양으로부터 항세균성 물질을 생산하는 Streptomyces sp. 의 분리

오현정,정완석,김세재,김창진,고영환 제주대학교 생명과학연구소 1999 제주생명과학연구 Vol.2 No.-

제주도의 토양에서 분리된 방선균 307주를 대상으로, paper disc법과 시험관 희석 배양법을 사용하여 항세균성 물질을 생산하는 균주를 선별하였다. 약 3.3%에 상당하는 분리주들이 Escherichia coli 8749, Staphylococcus aureus 6538 그리고 Pseudomonas solanacearum 10692에 대해 항균효과를 나타냈고, 그 중에서 가장 높은 항균활성을 나타내는 BL93 균주를 최종선별하여 동정하였다. BL93 균주의 배양학적, 형태학적, 생리학적, 생화학적 그리고 화학분류학적 특성을 기준으로 볼 때 Streptomyces violaceus와 유사하였기에, Streptomyces sp. BL93으로 명명하였다. 이 균주가 생산하는 항세균성 물질은 butanol보다도 물에 더 잘 녹는 극성화합물로 chloroform이나 ethylacetate에는 거의 용해되지 않았다. 100℃에서 30분간 가열 처리해도 활성의 소실이 거의 없었고, pH 3∼9범위에서 안정하였다. 분리균주 BL93은 aspartocin을 생산하는 Streptomyces violaceus와 유사함으로, BL93이 생산하는 항세균성 물질의 동정 및 aspartocin과의 비교 검토가 선행되어야 할 것이다. Three hundred and seven isolates of Actinomycetes were isolated and purified from soil samples in Cheju Is. to screen antibacterial compounds. About 3.3% of the isolates showed antibacterial activity, and one of them, BL93, showed relatively higher antibacterial activity against Escherichia coli 8749, Staphylococcus aureus 6538 and Pseudomonas solanacearum 10692 by both paper disc method and tube dilution incubation method. The isolate BL93 was similar to Streptomyces violaceus based upon its cultural, morphological, physiological, biochemical and chemotaxanomic characteristics. It was designated as Streptomyces sp. BL93. The antibacterial substance produced by the isolate BL93 had higher affinity for water than butanol and was insoluble in chloroform or ethylacetate. Most of its antibacterial activity was retained even after heating at 100℃ for 30min and was stable at pH ranges 3 to 9. As the isolate BL93 was tentatively identified to be Streptomyces violaceus, the antibacterial substance preferentially need to be identified and compared with aspartocin, an antimicrobial compound produced by Streptomyces violaceus.

폐렴구균의 용혈능 변화와 pneumolysin 유전자의 변이 양상

오원섭,장현하,정숙인,김연숙,이혁,김신우,김성민,백경란,이남용,송재훈 대한화학요법학회 2002 대한화학요법학회지 Vol.20 No.3

목적 : 폐렴구균은 인체에서 폐렴, 수막염 및 패혈증 등을 일으키는 중요한 병원균으로 현재 전 세계적으로 항균제 내성이 큰 문제가 되고 있다. 하지만 폐렴구균의 항균제 내성에 따라 병독성이 어떻게 변화하는지에 대해서는 구체적으로 알려져 있지 않다. 이에 기능적 및 구조적 분석을 통하여 폐렴구균의 주요 병독성 인자인 pneumolysin의 병인론적 역할을 규명하고자 하였다. 방법 : 임상 검체에서 분리된 페니실링 감수성 균주 20주와 내성 균주 20주를 대상으로 하였다. Pneumolysin의 세포 독성의 변화를 관찰하기 위하여 각각의 균주들의 용혈능을 측정하였고, pneumolysin 유전자를 중합효소 연쇄반응으로 증폭한 후 증폭 산물의 유전자 구조를 분석하였다. 결과 : 페니실린 감수성 균주와 내성 균주간의 용혈능은 유의한 차이를 보이지 않았으나, 일부 용혈능이 매우 낮은 균주에서 Lys152→Thr, Thr-172→Ile, Lys-224→Arg와 같은 변이가 관찰되었다. 결론: pneumolysin의 세포 독성의 변화는 항균제 내성 정도와는 무관하였으나, 일부 용혈능이 저하된 균주에서 발견된 pneumolysin 유전자의 변이가 pneumolysin의 세포 독성에 영향을 주는 것으로 보인다. Background : Pnumolysin (Ply) is one of the most important virulence factors of Streptococcus pneumoniae. To investigate the functional and structural variation of Ply, hemolytic activity (HA) and gene sequences of pneumolvsin were determined. Methods : A total of 40 invasive pneumococcal isolated (20 penicillin-susceptible & 20-resistant strains) were analyzed. HA of each isolate was measured in crude extracts (1×10^8 CFU/mL) hourly from the time of inoculation to 9h. Crude extracts (50㎕) and DTT buffer (100㎕) were serially diluted in 96-well plate and mixed with 1% sheep blood (50㎕). HA was represented as the reciprocal of the greatest dilution, which resulted in the complete lysis. Two sets of oligonucleotide primers were used to amplify a 1,474-bp fragment containing the coding region and a 578-bp fragment of upstream region of ply gene, respectively. Amplified products were directly sequenced. Results : HA showed a wide variation from 0 to 87,480 regardiess of penicillin MICs, serotypes or specimen sources. Two bacteremic strains showed completely no hemolytic activity. No significant differences in HA between penicillin-susceptible (Mean± SE : 15,468± 4,693) and penicillin-resistant strains (21,384± 4,087) were found (p > 0.05).Sequencing of the coding region showed unique alterations in amino acids in strains with markedly reduced hemolytic activity (≤ 40): Thr-172-Ile and Lys-224-Arg. However, upstream region of ply gene was highly conserved. Conclusions : Ply activity was not related with antibiotic resistance. Absence of HA in some strains was associated with unique alterations in amino acid sequences in ply gene. Relationnship between genomic alteration and functional changes in pneumolysin should be further investigated.