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A Study on the Functionality of Halophytes from Coast area of Jeollanam-do
Tae-Man Ha,Yang-Joon An,Mi-Yeong Shin,Sook Park,Hak-Jae Park,Hyo-Jeong Kang,Su-Jeong Choi,Jae-Yeong Yu,Ji-Yun Jeon,Gyu-Yeon Oh 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
This study was undertaken to improve the perceived value of halophytes and contribute to the activity of the local economy by analyzing the antioxidant activity and mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina that grow wild on the mud flats and coastal areas. The total phenolic compound content found in each order is as follows: Suaeda japonica (3.674∼5.989 mg TAE/g dry wt.), Tetragonia tetragonoides (2.515∼4.471 mg TAE/g dry wt.), and Spergularia marina (2.450∼4.067 mg TAE/g dry wt.); DPPH radical scavenging and ABTS cation radical scavenging activities were also recorded in the same order. In the case of minerals, Iron(Fe) was relatively high in Suaeda japonica (960.1∼1,346.7 mg/kg), Manganese(Mn) in Tetragonia tetragonoides (197.1∼574.8 mg/kg), and Zinc(Zn) was relatively high in Spergularia marina (63.19∼216.56 mg/kg). It was confirmed that the mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina was significantly higher than that of Chinese cabbage, lettuce, leek, and spinach.
Tae‑Woon Hong,Sang‑In Lee,Jae‑Hyeok Shim,Myoung‑Gyu Lee,Joonho Lee,Byoungchul Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
An artificial neural network (ANN) model was developed to predict the tensile properties as a function of alloying elementand microstructural factor of ferrite-pearlite steels. The input parameters of the model were composed of alloying elements(Mn, Si, Al, Nb, Ti, and V) and microstructural factors (pearlite fraction, ferrite grain size, interlamellar spacing, and cementitethickness), while the output parameters of the model were yield strength and tensile strength. Although the ferrite-pearlitesteels have complex relationships among the alloying elements, microstructural factors, and tensile properties, the ANNmodel predictions were found to be more accurate with experimental results than the existing equation model. In the presentstudy the individual effect of input parameters on the tensile properties was quantitatively estimated with the help of theaverage index of the relative importance for alloying elements as well as microstructural factors. The ANN model attemptedfrom the metallurgical points of view is expected to be useful for designing new steels having required mechanical properties.
텔레스코픽 크라운 임플란트 지지 피개의치와 치아 지지 피개의치의 하악골내 응력분포에 관한 유한요소분석
이창규,백장현,김태훈,김민정,김형섭,권긍록,우이형 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.1
PURPOSE. The purpose of this study was to investigate the stress distribution in mandibular implant-supported overdentures and tooth-supported overdentures with telescopic crowns. MATERIALS AND METHODS. The assumption of this study was that there were 2, 3, 4 natural teeth and implants which are located in the second premolar and canine regions in various distributed conditions. The mandible, teeth (or implants and abutments), and connectors are modeled, and analyzed with the commercial software, ANSYS Version 10.1. Stress distribution was evaluated under 150 N vertical load bilaterally on 3 experimental conditions - between canine areas, canine and 2nd premolars, 10 mm posterior to 2nd premolars. RESULTS. Overall, the case of the implant group showed more stress than the case of the teeth group in stress distribution to bone. In stress distribution to superstructures of tooth and implants, there was no significant difference between TH group and IM group and the highest stress appeared in TH-IV and IM-IV. The stress caused from bar was much higher than those of implant and tooth. TH group showed less stress than IM group in stress distribution to abutment teeth and implant. CONCLUSION. The results shows that it is crucial to make sure that distance between impact loading point and abutment tooth does not get too far apart, and if it does, it is at best to set abutment tooth on premolar tooth region. It will be necessary to conduct more experiments on effects on implants, natural teeth and bone, in order to apply these results to a clinical treatment. 연구 목적: 이 연구의 목적은 텔레스코픽 크라운 하악 임플란트 지지 피개의치와 치아 지지 피개의치에서 지대치의 수와 위치에 따른 응력 분산을 비교하기 위함이다. 연구 재료 및 방법: 본 연구에서는 임플란트를 4개 식립하고 임플란트 지지 피개의치로 설계하였고, 식립 위치를 견치와 소구치 부위에 위치 별로 3개 또는 2개 존재시를 실험군으로 설정하였다. 자연치아를 갖는 경우도 견치와 제2소구치 4개를 가진 경우를 대조군으로 설정하고 부위별로 3개 또는 2개를 가지는 경우를 실험군으로 설정하였다. ANSYS Version 10.1 (Swanson, Inc., USA)로 분석하였다. 결과: 악골내 응력의 경우, 전반적으로 임플란트(IM)로만 구성된 경우가 치아(TH)로만 구성된 경우에 비해 응력이 크게 발생하였다. 상부구조의 경우, 치아군(TH)과 임플란트군(IM) 사이의 차이는 크게 없었으며 편측 견치와 제2소구치에 지대치 또는 임플란트가 위치하는 경우 가장 큰 응력이 나타났고 바(bar)에서 발생된 응력이 임플란트와 치아에서 발생되는 응력에 비해 상대적으로 훨씬 크게 발생하였다. 지대치와 임플란트의 경우, 치아군(TH)이 임플란트군(IM)보다 응력이 작게 발생하였다. 결론: 본 연구의 결과로부터 지대치(임플란트 또는 치아)를 설정할 때는 하중작용점과 지대치 사이의 거리가 너무 길어지지 않도록 지대치의 수와 위치를 확보해야 하며 소구치 자리에 지대치를 확보하는 것이 유리하다. 앞으로, 실제 임상에 적용하였을 경우, 임플란트 및 자연치아와 악골에 미치는 결과에 대한 연구가 더 필요할 것으로 생각된다.
cone beam형 전산화 단층촬영장치를 이용한 절치관의 연구
김규태,황의환,이상래 大韓口腔顎顔面 放射線學會 2004 Imaging Science in Dentistry Vol.34 No.1
Purpose : To investigate the anatomical structure of the incisive canal radiographically by a cone beam computed tomography. Materials and Methods : 38 persons (male 26, female 12) were chosen to take images of maxillary anterior region in dental CT mode using a cone beam computed tomography. The tube voltage were 65, 67, and 70 kVp, the tube current was 7 mA, and the exposure time was 13.3 seconds. The FH plane of each person was parallel to the floor. The images were analysed on the CRT display. Results : The mean length of incisive canal was 15.87mm±2.92. The mean diameter at the side of palate and nasal fossa were 3.49 mm±0.76 and 3.89 mm±1.06, respectively. In the cross-sectional shape of incisive canal, 50% were round, 34.2% were ovoid, and 15.8% were lobulated. 87% of incisive canal at the side of nasal fossa have one canal, 10.4% have two canals, and 2.6% have three canals, but these canals were merged into one canal in the middle portion of palate. The mean angles of the long axis of incisive canal and central incisor to the FH plane were 110.3˚±6.96 and 117.45˚±7.41, respectively. The angles of the long axis of incisive canal and central incisor to the FH plane were least correlated (r = 0.258). Conclusion : This experiment suggests that a cone beam computed radiography will be helpful in surgery or implantation on the maxillary incisive area.
조규태 한국어문학회 2003 語文學 Vol.0 No.80
In academic circles the xylographica of Yongbieocheonga has been called Garam Block Books, the Old Block Books, Manryeok Block Books, Geonryung Block Books, Silrok Block Books, and the Abridged Block Books. However, each block books are required to be named newly because the present names are not able to show the descent of Yongbieocheonga properly. Each wood-carved independent Books, was renamed the First Carved Books[the First Carved-First Printed Block Volume, the First Carved-Second Printed Block Volume] and the Second Carved Books[the Second Carved-First Printed Volume, the Second Carved-Second Printed Volume, the Second Carved-Third Printed Volume]. The others such as Silrok Block Books, and the Abbreviated Block Books, were not renamed. Most of the block books are in Gyujanggak Library of Seoul National University, but some of them are possessed by Korea University, Yonsei University and Keimyung University. In this discussion, by making the First Carved-Second Printed Block Volume the gound book we corrected the words by contrasting respective books. Accepting the previous suggestions made by Lee Ki-moon(l962) and Chung Yun-chan(l969) we made the following corrections in this discussion. Some of puntuation marks in the corrected volume by Lee Ki -moon are wrongly made and we corrected them by referring to the Second Carved-First Printed Volume. The corrected chapters are the 8th, 13th, 15th, 21st, 27th, 31st, 32nd, 35th, 52nd, 59th, 62nd, 63rd, 66th, 67th, 69th, 71st, 80th, 82nd, 101st, 105th, 114th, 115th, 118th, 119th, 123rd, 125th poems. In punctuating poems commas are represented as 'ㆍ', and periods as '。'. Side dots corrected by Chung Yun-chan are nearly complete but those in '右文之德ㆍ이' are not correct. Punctuation marks in poems are the same in. all the block books. The incorrect punctuation marks in the original poem are put corrected in foot notes. The chapters in which we found the incorrect punctuations are the 4th, 20th, 21st, 23rd, 57th, 51st, 88th, 89th, 90th, 91st, 92nd, 95th, 112th, 113th, 114th, 117th, 125th, although 17 poems.
동독주민의 '2등 국민' 의식의 원인에 관한 일고 : 경제적 요인을 중심으로
성태규 서강대학교 사회과학연구소 2002 社會科學硏究 Vol.10 No.-
통일이후 11년이 지나도록 동독주민은 여전히 '2등 국민' 의식을 지니고 있다. 이런 의식은 한 국가내의 주민통합을 저해함으로써 현재 통일독일에서 큰 문제로 대두되고 있다. '2등 국민' 의식의 원인은 정치적, 사회적, 경제적, 심리적 차원 등에서 접근할 수 있는데 본고에서는 주로 경제적 차원에서 제기되는 원인을 검토·정리 하였다. 경제적 차원에서 동독주민은 실업문제, 동서독사이의 경제적 격차, 그리고 통일이후 물질적 불평등분배가 주장되고 있다. 이 가운데 시업은 동독주민의 동독으로의 통합을 저해하는 가장 커다란 문제이다. 그렇지만, 도서독사이의 경제적 차이와 물질적 불평등 분배문제는 통일 이후 지속적으로 개선되어왔기 때문에, '2등 국민' 의식의 주요한 경제적 원인이 된다고 하기는 어렵다 Elf Jahre nach der Wiedervereinigung leidet Deutschland noch an der "innere Einheit". Die ist sich mit zwei unterschiedlichen Niveau zu befassen. Das erste ist ein Konflikt zwischen dem Bu¨rgern von West- und Ostdeutschland, und das zweite ist das Verachtungsgefu¨hl von Ostdeutsche, das als "zweite Bu¨rger" genannt ist. Die zwei Probleme sind gemischt und treten in Beziehung einander. Aber die Gru¨nde dieser Probleme sollte lieber us den Ostdeutsche analysiert werden, weil die Wiedervereinigung in Form von Inkorporation verwirklicht ist, und dadurch die Vereinigung den Ostdeutschern eine Systemtransformation bedeutet. Die Pha¨nomene dieser Probleme sind in den einigen Felde zu beobachten. Die Ostdeutsche zeigen "Ostalgie", die ein Heimweh nach der alten System bedeutet. Aber das Heimweh ist nicht nach der alten Sozialismus, sondern nach der humanitischen Gesellschaft, die die gegenwa¨rtigen vereinigten Deutschland u¨berlegen. Die Ostdeutsche zeigen weinge nationale Identita¨t mit vereinigten Deutschland und noch mit eigenen 'Ostdeutschland'. Die Gru¨nde dieser Probleme sind aus unterschiedlichen Hinsicht bisher gegenseitig analysiert, die aus "Situationsthese" einerseits, aus "Sozialisationsthese andererseits zusammenzufassen zu sind. Von "Situationsthese" sind die negative materiellen wirtschaftlichen Bedingungen der vereinigten Deutschland behauptet, und von "Sozialisationsthese" die psychische Probleme, die auf die Systemtransformation zur Marktwirtschaft zuru¨ckzufu¨hren sind. In diesem Aufsatz sind die Gru¨nde der "inneren Mauer" oder Verachtungsgefu¨hl von "zweite Bu¨rgern" in drei Gebiete analysiert. Das erste ist materiellen wirtschaftlichen Gebiet, auf dem vor allem hohen Arbeitslosigkeit in Ostdeutschland, der materiellen Unterschied zwischen West- und Ostdeutschland, und die allgemeine wirtschaftlichen Aussicht u¨ber eigenen Ostwirtschaften. Das zweite Gebiet befasst die Identita¨tsprobleme im Lebenswelt, die von der Systemtransformation zur Marktwirtschaft herkommen. Die Identita¨tsprobleme stehen in Bezug erstens zu die UngewiΒheit im Beruf und derzufolge im eigenen Leben, zweitens zu die Auflo¨sung von familia¨ren und freundschaftlichen Beziehungen, drittens zu das sozialistische Gefu¨hl von materiellen Ungleichheit in Ostdeutschland. Das Gefu¨hl von Diskrimination und Ungleichheiten stammt aus dem sozialistischen BewuΒtsein. Das dritte Gebiet befasst die Unzufriedenheit in politischen System. Die Probleme in diesem Gebiet kommen aus der Uneinigkeit zwischen den politischen Kulturen der Ostdeutschen und gegenwa¨rtigen politischen Strukturen in vereinigten Deutschland. Diese Gru¨nde sind einfach nicht schnell zu beseitigen, weill die lange Teilung wirtschaftlich und psysisch auf den beiden Deutschen stark beeinfluΒt hat. Besonders erfahren die Ostdeutschen viele UngewiΒtheit im Beruf und psychische Unruhe, weil die Vereinigung ihnen eine Transformation von System und Identita¨t bedeutet. Obwohl die perso¨nlichen materiellen Bedingungen von Ostdeutschen nach der Vereinigung viel verbessert sind, erfahren die Ostdeutsche Anpassungsschwierigkeit an neuen Gesellschaftssystem.
이태규 우송대학교 2003 우송대학교 논문집 Vol.8 No.-
To apply the research results to the design and the construction of the high rise buildings, long-term behavior of reinforced concrete structure has been widely studied. Shoring and reshoring at early ages, however, have not been considered in the most of studies, and the removal of forms and shores was handled one construction sequence. So, the deformation occurred at the early age before the removal of shore has been neglected. This paper deals with two-dimensional frame analysis of reinforced concrete structures considering the time-dependency. In this program, construction sequence including the settlement and the removal of shores is considered to predict axial force variation due to forms, shores, and time-dependent concrete stiffness. Analytical results show that the time-dependent axial force of shores is reduced, and the redistributed axial force of the interior column is greater than the value by elastic analysis and that of the exterior column is smaller. In order to demonstrate the validity of this program, the test frame was constructed in sequence of the placement of concrete, form removal, reshoring, shore removal, and the application of additional load. This program predicts experimental results well.
O_3와 O_3/UV를 이용한 수용액중의 음이온계면활성제의 처리에 관한 연구
김태성,문병현,이택순,서규태 7개 국립대학교 환경연구 논문집 공동발행 위원회 2001 환경연구논문집 Vol.1 No.1
Water pollution by discharging surfactant into receiving water has become serious. One of pollutants widely contained in domestic wastewater is surfactants. To remove these surfactants, ozonation has been used but it doesn't perfectly remove relatively non-degradable organic matter. Recently, an advanced oxidation process using OH radical has been developed and applied for removing such non-degradable pollutants. In this study it was treated Sodium Dodecyl Benzene Sulfonate (DBS) using Ozone and Ozone/UV process. The results showed that removal efficiencies by Ozonation increased as the dissolved ozone concentration, initial temperature and pH increased. The combination process of Ozone/UV for DBS removal resulted in 4 times higher reaction rate than the Ozonation process. The combination process showed higher removal efficiencies for treating laundry wastewater and the removal efficiencies was increased by pretreating particle matters.
金泰麟,崔漢圭 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-
南海 沿岸 地上測後所의 過去風速資料와 麟風 記錄으로 부터 過去의 波浪 資料를 推算(Hindcast-ing)하고 이로부터 얻어진 地域別 波向別 年間 最大波浪의 極植 系列로 부터 確率分析을 通하여 深海 設計波를 決定하는 方法이 提案되었다. 南海 沿岸에 來襲하는 큰 波浪은 麟風과 春夏李 李節風에 의해 生成되며 地域別 波向別로 상당한 差異를 보인다. 再現其間이 100年인 設計 有意波의 波高는 深海에서 4.6m~8.8m, 週期는 8.2sec~12.9sec의 範圍 For determination of the design waves at the seven selected sites in the South Sea, a method of hindcasting the past annual largest significant waves from the records of both the sind speed at the nearby weather stations and the weather charts of typhoons are utilized. The design signifi-cant waves in deep water are determined through the extremal probability analysis for three ma-jor wave directions(SW.S.SE) at each site from the annual extremal series of wave heights. Design significant wave height with the return period of 100 years ranged between 4.6m and 8.8m, with the wave period ranging between 8.2 seconds and 12.9 seconds. Through the analysis of weather maps, both the fetches for the wind directions SW-SE along the South Coast and the relationship between the wind speed at sea and the wind speed at the nearby land weather sta-tions for seasonal winds are determined. The wind speed at sea are found to be 0.8-0.9 times the wind speed at the land stations for U_(L)>15㎧. The ratio of the duration-averaged wind speed to the maximum wind speed varies between 0.7-0.9 as a negative exponential fuction for the dura-tion ranging 2<t<13 hours.
참지식 부직포여과 활성슬러지 시스템의 가정 오수처리 적용 타당성 조사 연구
임태진,서규태,이택순,문병현 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
An experimental study was conducted to investigate the applicability of non-woven fabric filter as an alternative separation material in membrane combined activated sludge process. The most advantage of the fabric filtration activated sludge system is the low operation and maintenance cost resulting from the ready available material and gravity filteration. The system was consisted of two reactors, anoxic and aerobic one with working volume of 0.28㎥ and 0.47㎥, respectively. The non-woven fabric filter module was immersed in the aerobic compartment for separation of activated sludge by gravity filtration. Although the system showed high potential to treat domestic wastewater the initial leakage of bio-solid from the reactor and reduction of permeate flux were main problems of the system. The initial flux of 0.4㎥/㎡/day reduced to 0.2㎥/㎡/day in 12 days operation at 133㎝ water head. During the stable operation period, average SS concentration of effluent was 1.8㎎/L showing 96.4% removal. Organic removal efficiency was 98.3% as COD_Cr and 91.6% as BOD with the effluent concentration, 14.4㎎/L and 1.5㎎/L, respectively. T-N removal efficiency was 60% at C/N ratio 4.5.