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.

Artificial Neural Network for Modeling the Tensile Properties of Ferrite-Pearlite Steels: Relative Importance of Alloying Elements and Microstructural Factors

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.

터널 라이닝 콘트리트의 물성 평가에 관한 연구

이태규 우송대학교 1997 우송대학교 논문집 Vol.2 No.-

The purpose of this study is to identify the various characteristics of the many years old railway tunnel linning concrete. The nondestructive technique such as the surface hardness method and the ultrasonic method, the extent of carbonation by the phenolphthalein indicator, and the chemical analysis due to XRD/XRF are considered. Also the concrete are was cut in two pieces per tunnel for the exact evaluation of strength. On the basis of the experimental result, it is concluded that the durability and the serviceablity of old tunnel linnig concrete are affected by the initial mixing condition and the environmental effect.

Kerr-Lens 모드-록킹되는 티타늄 사파이어 레이저의 대칭형 공진기의 설계와 안정성에 대한 분석

추한태,윤병운,김규욱,이태동 금오공과대학교 산업기술개발연구원 2001 産業技術開發硏究 Vol.17 No.-

Design and theoretical analysis for the spot size and the Kerr-lens mode-locking(KLM) strength can be represented as explicit function of the position in the cavity, the intracavity laser power, and the stability parameter for symmetrical Z-type laser cavity with a four-mirror. The results indicate that the KLM strength achieves its maximum value at the edge of the stability range. Self-amplitude modulation and group-velocity dispersion compensation can be established by using of the intraprism path length and the separation of a prism pair for beam path in the cavity. Also we have compared above theoretical results with the experimental data for our KLM Ti:sapphire laser system, and can obtain the pulse width of 25.7 fs with the FWHM of 33 nm and the repetition rate of 82 MHZ.

철근콘크리트 단순보 및 연속보의 시간단계 해석

이태규 우송대학교 1999 우송대학교 논문집 Vol.4 No.-

In this paper, the prediction of the time-dependent deflection of cracked reinforced concrete beams is presented. The stiffness matrix of concrete elements considering the axial strain-curvature interaction effect is derived. In order to calculate the cracked sectional properties, the method which is directly used in the axial strain and curvature of the sectional centroid is developed. The creep and shrinkage properties used in the predictions were calculated in accordance with ACI 209, CEB-FIP 1990, and B3 model code. To demonstrate the validity of this algorithm, the prediction of this proposed method are compared with the results of other experimental work considering the unloading condition reported in the literature. The proposed method is shown to be in good agreement with experimental results.

타원편광해석법에 의한 MOCVD-Nb₂O5 박막의 성장과정과 내식특성에 관한 연구

이찬규,윤재홍,김명호,박태곤,杉本克久,이성훈 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-

Nb(OC₂H?)?를 원료로 하여 AP-MOCVD에 의한 N₂O?박막의 성장과정을 기판온도, carrier gas유량, 원료온도, 반응 O₂gas의 함수로 in-situ Ellipsometry에 의해서 조사하였다. 실험결과 얻어진 Δ-Ψ곡선은 투명균질막의 이론적 Δ-Ψ곡선에 잘 일치하였으며 성장과정은 473∼673K의 저온영역에서는 1단계적 직선 성장거동을 나타내었고 673∼753K의 고온영역에서는 2단계의 직선적 성장거동을 나타내었다. 석출된 박막의 밀도를 의미하는 굴절율은 기판온도 673K까지는 증가하나 그 이상의 온도에서는 감소하기 시작했다. 그리고 산소를 첨가하지 않았을 경우는 723K에서 석출된 박막이 가장 뛰어난 내식성을 나타내었는데 이것은 이 온도에서부터 석출박막이 δ-Nb₂O?로 결정화하기 때문이라 사려된다. By the Nb(OC₂H?)? source, Growth process of Nb₂O? films formed by AP-MOCVD has been examined by in-situ Ellipsometry as a function of the substrate temperature, carrier gas flow rate, source temperature and reactant O₂gas flow rate, Δ-Ψcurve obtained in experimental results corresponded to the theorical Δ-Ψcurve of transparant homogenious film, and showed a rectilineal growth behaviour of the one stage at a low temperature range of 473∼673K and indicated a rectilineal growth behaviour of the two stage at the high temperature of 673∼753K. A refractive index meaning density of the deposited film increased until 673K of the substrate temperature but decreased above 673K. In the absence of oxygen, The thin film deposited at 723K showed the most excellent corrosion resistance, because the deposited film was crystallized into the δ-Nb₂O? above 723K.

"하나의 하늘" 槪念을 향하여

이태규 안양대학교 복지행정연구소 1997 福祉行政硏究 Vol.13 No.-

비엔나 協約上 權利移轉과 危險負擔에 關한 硏究

이태규 안양대학교 복지행정연구소 2000 福祉行政硏究 Vol.16 No.-

이 논문은 이른바 비엔나 협약상 권리이전과 위험부담에 대한 내용을 중심으로 소개하고, 이와 관련된 미국 통일상법전(U.C.C.)과 우리 나라 민법상 규정을 비교하고 정리함을 목적으로 하고 있는데, 먼저 하나 밝혀둘 것은 위험부담 이전시기에 대한 협약상 기준은 2차적 내지는 보충적 기능이기 때문에 먼저 당사자간의 의사표시에 따라 그것이 정해지는 것이 일반적이라는 점이다. 다시 말해 협약상 기준은 그러한 의사표시의 기능적 합치 즉 합의가 없는 경우에 비로소 적용되는 것이다. 구체적으로 본 논문에서, 가장 중심이 되는 협약 제 66 조를 일반조항으로 바탕 삼아, 제 67 조는 운송인이 개입한 경우, 제 68 조는 운송 중 물건의 매매행위가 발생한 경우, 그리고 제 69 조는 상기 두 개 조항에 해당되지 않는 일반적 경우에 대한 규율을 정리하고, 마지막으로 주의적 내용으로서 제 70 조에서는 계약의 위반과 위험이전의 문제는 전혀 별개임을 천명하고 있다.

국제사법재판소의 역사적 배경에 관한 연구

이태규 안양대학교 사회과학연구소 1997 社會科學硏究 Vol.5 No.-

ABSTRACT Nowadays when the international relationship has been "renormalized" since the end of the Cold War era, among the means of peaceful settling international disputes, a judicial way of settlement, whIch embodies the pre-fixed judiciary procedures, and an independent and neutral judiciary organ free from any kinds of impacts and influences including the disputed states', has been treated as a favored means despite its most authoritative and final nature. This kind of new tendency in which the pursuit of international disputes settlement through the law rather than politics supported by power leads me in this article to discuss what the Interational Court of Justice is and what its historic backgrounds are really about.