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TTF(COO^-)_4 음이온이 삽입된 층상형 이중수산화물(LDH)
노동윤,서은미,한상미 서울여자대학교 자연과학연구소 1997 자연과학연구논문집 Vol.9 No.-
본 연구에서 마그네슘과 알루미늄 LDH에 C_3S_3(COO^-)_2와 TFF(COO^-)_4를 음이온 교환은 통한 삽입(intercalation)하여 합성하고 적외선 분광과 x-선 회절 분석법에 의해 분석하였다. C_3S_3(COO^-)_2의 경우 적외선 분석에 의해서는 카르복실기의 존재가 확인되었지만 x-선 회절 분석에 의하면 층 자체가 깨어짐을 볼 수 있다. Mg^2+/Al^3+/NO_3^-에서 한 층의 간격이 7.7Å 인데 비해 Mg^2+/Al^3+/TTF(COO^-)_4의 한 층의 간격이 7.87Å로 음이온 교환에 의해 층 간격이 넓어졌음을 알 수 있다. 그러나 이 층의 간격이 TTF(COO^-)_4가 층에 수직인 상태로 삽입될 정도로 넓지 않아 층에 평행인 상태로 들어가 있음을 알 수 있다. 만약 M^2+/M^3+의 비를 조절하여 합성한다면 TTF(COO^-)_4가 수직인 상태로 삽입될 수 있음을 예측할 수 있다. New layered double hydroxide(LDH) intercalation complex of the type [Mg_l-xAl_x(OH)_2s][TTF(COO-)_4]_x/4g·zH_2O has been prepared by the direct method. According to the XRD measurement, interlayer space of the TTF(COO-)_4-intercalated complex(7.84A˘ ) is larger than that of NO_3 (7.7A˘). From these data we propose that TTF(COO-)_4 anions be lying in LHD layer, which is identified from the calculation of the charge density.
이진옥,지동현 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2
Seismic inelastic analysis was carried out to braced and non-braced fifteen-story steel frame designed based on SC-WB concept. EI Centro ground motion was applied with peak ground acceleration 02.g. 0.3g and 0.4g. Step by step integration method was used to solve dynamic equilibrium. The result of dynamic inelastic analysis in the case of 04.g was compared with that of elastic analysis. By the comparison of the linear elastic analysis and inelastic analysis, relatively smaller displacement in the case of inelastic analysis than linear elastic analysis was found and the fact that the formation of the plastic hinge has the effects of stress dispersion make economical design possible at the strong earthqauke.
Cambodia’s Foreign Policy Choice during 2010 to 2020: From Strategic Hedging to Bandwagoning
Doung Chandy,Kang William,김재천 한국국제정치학회 2022 The Korean Journal of International Studies Vol.20 No.1
This research traces the ways in which Cambodia has handled the escalating contention between the United States and China in Southeast Asia from 2010-2020 and the dynamics that shaped Cambodia’s foreign policy during that period. The existing literature has tended to view Cambodia’s foreign policy choices as monolithic and consistently pro-China. This research challenges this conventional assessment about Cambodia’s foreign policy. The analyses in this research indicate that the changes in Cambodia’s foreign policy choices toward the United States and China have been driven by domestic political dynamics to a substantial extent, along with the other exogenous variables such as economic, security, and diplomatic factors. In addition, internal factors are not always stable, as most observers of Cambodia’s foreign policy have claimed. Due to the unstable nature of internal factors, Cambodia’s foreign policy has not always tilted towards China continuously. Cambodia’s foreign policy has been in flux and swung between the United States and China. To drive this point home, this research adopts and applies the returns-maximizing and risk-contingency options of the strategic hedging model to demonstrate Cambodia’s foreign policy shift from hedging to bandwagoning.
Doung Chankhihort,Byung-Muk Lim,Gyu-Jung Lee,Sungsu Choi,Sun-Ock Kwon,Sang-Hyun Lee,Jeong-Tae Kang,Aziz Nasridinov,Kwan-Hee Yoo 한국콘텐츠학회(IJOC) 2017 International Journal of Contents Vol.13 No.2
Abnormal data in the manufacturing process makes it difficult to find useful information that can be applied in data management for the manufacturing industry. It causes various problems in the daily process of production. An issue from the abnormal data can be handled by our method that uses big data and visualization. Visualization is a new technology that transforms data representation into a two-dimensional representation. Nowadays, many newly developed technologies provide data analysis, algorithm, optimization, and high efficiency, and they meet user requirements. We propose combined production of the data visualization approach that uses integrative visualization of sources of abnormal pattern analysis results. The perceived idea of the proposed approach can solve the problem as it also works for big data. It can also improve the performance and understanding by using visualization and solving issues that occur in the manufacturing process with a calendar heat map.
Sorting by Sound-Arbitrary Lexical Ordering for Transcribed Thai Text
( Doung Cooper ) 한국언어정보학회 1995 국제 워크샵 Vol.1995 No.-
When either Thai or transcribed (RomanizedJ Thai is sorted alphabetically, words that sound very much alike usually end up far apart. maay and may are thrown to opposite ends of the letter m entries, even though mistaking one for the other causes problems for both foreign students who cannot speak clearly, and Thais who can``t spell. This paper explains how and why the difficulty occurs, and shows why both Thai and transcription are inherently difficult to sort by sound. It introduces a method of preprocessing - deriving phonemic signatures - that lets us define improved lexical or dictionary orders, yet does not require anything but standard sorting code. The method can be applied to other languages - Lno, Khmer, and Burmese - that, like Thai, distinguish words on the basis of vowel length and/or tone.
Piseth Doung,Eiichi Sasaki 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.2
This study provides a simplified method for the evaluation of shear lag stress in rectangular box T-joints. The occurrence of shear lag phenomenon in the box T-joint generates stress concentration localized at both web-flange junctions of the beam, which leads to cracking or failure in the weld region of the joint. To prevent such critical circumstance, peak stress at the weld region is required to be checked during a preliminary design stage. In this paper, the shear lag stresses in the T-joints were evaluated using least-work solution in which the longitudinal displacements of the beam flange and web were presumed. The evaluation process considered particularly the effect of column flange flexibility, which was represented by an axial spring model, on the shear lag stress distribution. A simplified method for stress evaluation was provided to avoid solving complex mathematical problems using a stress modification factor βs from a parametric study. The results showed that the proposed method was valid for predicting the shear lag stress in the box T-joints manually, as well compared with finite element results. The results are further summarized, discussed, and clarified that more flexible column flange caused higher stress concentration.