cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2006.1808
title: A Comparative analysis of CDO pricing models

description: This study concerns pricing and risk measuring of Collateralized Debt Obligations (CDOs) by using a L'evy distribution/process. The paper provides a framework to price CDOs using an asymmetric depencence structure based on the Meixner distribution since it processes desirable properties such as fat-tail, skewness, and jump component. Moreover, it is relatively simple to implement comparing to other Levy processes. it is shown that the Meixner distribution can be applied to both copula and structural form approaches. Using the prices of CDOs on the CDX NA IG, the performances of the proposed models are examined and compared to those of standard models such as Gaussian copula model, double-t copula model, and correlated Brownian motion structural model. It is found that the Meixner-based models have the edge over the standard models in all cases in terms of the mean absolute pricing errors (MAPEs). Using the paired Z-test also confirms that the proposed models seem to outperform the standard ones. Additionally, the risk measures of the models are examined.
DOI: 10.14457/cu.the.2006.1809
title: Study on economic and environment efficiency of offset and digital printing systems

description: In generally, printing service is classified in small business entity which is located in community area. The environmental impact studied will be a necessary factor for all service providers because of wastes will directly effect to each community area. This research is studied about the environmental impact and cost of printing production by comparing between Offset printing (most favorite in Thailand) and Digital printing (new alternative for printing service). We study the different of four case studies as; 70% of printing page (black & white printing), 100% of printing page (4-color printing), 76 Pages of printing book (black & white printing) and 132 Pages of printing book (4-color printing). According to environmental impact studied by Eco-indicator 99, we can conclude that Offset printing system will effect an environmental in term of plate making system. In average impact per one piece of production, an environmental impact will be changed by increased of printing job. At the next step, we study an environmental impact by changing the chemical element. We use the Vegetable oil instead of Benzene and result in decreasing the impact in term of Carcinogens, Respiratory of organics and Ecotoxicity while increasing an impact of Land use. Finally we compare all aspects of environmental impact between Offset printing and Digital printing system and conclude that Offset printing system can effect higher impact than Digital printing system. Therefore, the Digital printing system is one effective alternative in order to decrease environmental impact. In production cost, Digital printing system will be cheaper than Offset printing system in low level of production. While Offset printing system will be cheaper than Digital printing system in high level of production. Moreover cost of production under Offset printing will be decreased by each production increased.
DOI: 10.21227/nmvt-z148
title: Corona Virus (COVID-19) Tweets Dataset

description: Tweets Counter: 9.1 Million plus (collecting since Feb 1, 2020)Each database (*.db) contain three columns.First column: date and time of the tweetSecond column: tweetThird column: sentiment score for the particular tweet within the range [-1,1] with -1 being the most negative, 0 being the neutral and +1 being the most positive sentiment.The tweets have been collected by the LSTM model deployed here at sentiment.live.To make it easy for the NLP researchers to get access to the sentiment analysis of each collected tweet, the sentiment score out of TextBlob [2] has been appended as the last column. New databases will be added to this dataset every week. Bookmark this page for further updates. [1] https://sentiment.live/ [2] https://textblob.readthedocs.io/en/dev/
DOI: 10.14457/cu.the.2006.1810
title: Real-time traffic signal control for maximizing network throughput

description: To develop an actuated traffic-signal-control method that has ability to efficiently manage traffic, especially oversaturation, by considering not only present situation in only small area but also considering the effect to the whole network in nearly future and to compare effectiveness with some other methods. This method focuses on maximizing overall throughput of the system. The scope of study covers two parts which are developing and testing the method in some different levels of traffic. The method is developed and it is tested on a computer-simulated corridor with four intersections compared to fixed-time method with and without prevention of green-time loss. The tool used in the test is a micro-simulation program, named Paramics. The results, which are number of vehicles containing in the system, average green time given to each link during a peak hour, destination arrival, real-time throughput, real-time average speed in the system, total travel time, and peak throughput, are statistically considered. The results show that the method really gives very high total throughput to the system in the condition of having oversaturated demand. It also works well with the saturated one but this method works inefficiently for the case of having too low demand that is considered to be less than theoretical capacity of the system.
DOI: 10.15468/2k4ykm
title: Taxonomy and distribution of enigmatic " helicoid " Polygyratia Gray, 1847 (Gastropoda, Stylommatophora)

description: This dataset contains the digitized treatments in Plazi based on the original journal article Salvador, Rodrigo Brincalepe, Cavallari, Daniel Caracanhas (2020): Taxonomy and distribution of enigmatic " helicoid " Polygyratia Gray, 1847 (Gastropoda, Stylommatophora). Zoosystematics and Evolution 96 (1): 91-101, DOI: http://dx.doi.org/10.3897/zse.96.51047, URL: http://dx.doi.org/10.3897/zse.96.51047
DOI: 10.14457/cu.the.2006.1811
title: Acquirers' overconfidence : evidence from analysis' forecast

description: To provide an empirical evidence on the ultimate wealth effect of acquirers' overconfidence. Two important findings emerge. Firstly, merger and acquisition activities are value-creating investments for acquirer shareholders in the short-run as well as in the long-run. Secondly, the results indicate that firms are not overconfident when making the merger and acquisition decisions. This is inconsistent with the famous hypothesis by Roll (1986) that acquirers are overconfident in their ability to extract value from acquisition. Interestingly, there is no evidence of the market's overextrapolation hypothesized by Rau and Vermaelen (1998) either. Moreover, the findings are generally robust to alternative methods for estimating overconfidence.
DOI: 10.14457/cu.the.2006.1812
title: Density functional study of conversions of 2,3-dimethyl-2,3-butanediol and 2,3-dimethyl-2,3-pentanediol in acid-catalyzed systems

description: Conversion reactions of 2,3-dimethyl-2,3-butanediol (DMBDOL) to 2,3-dimethyl-1,3-butadiene (DMBDENE) and 2,3-dimethyl-2,3-pentanediol (DMPDOL) to 2,3-dimethyl-1,3-pentadiene (DMPDENE) in acid-catalyzed system have been investigated using density functional theory method at B3LYP/6-31G(d) and B3LYP/6-311+G(d,p) levels of theory. Activation energies of conversion reaction of 2,3-dimethyl-2,3-butanediol (DMBDOL) and 2,3-dimethyl-2,3-butanediol with molecule of water in acid-catalyzed systems are 55.13(60.17) and 26.21(30.42) kcal/mol, respectively. The activation energy of conversion reaction of 2,3-dimethyl-2,3-pentanediol (DMPDOL) and 2,3-dimethyl-2,3-pentanediol with molecule of water in acid-catalyzed systems is 69.74(67.15) and 20.12(29.05) kcal/mol, respectively (method B3LYP/6-31G(d) is in the parenthesis). The activation energy of the conversion reaction of 2,3-dimethyl-2,3-butanediol and 2,3-dimethyl-2,3-pentanediol are decreased when the water molecule was added. The water molecule is sufficient to affect protonation, can acts as a base to remove the adjacent protons from intermediates.
DOI: 10.14457/cu.the.2006.1813
title: Behavior of diaphragm wall during excavation process using top-down method in Bangkok subsoil

description: The simple linear elastic-perfectly plastic model with soil parameters s[subscript u], E[subscript u] and v of undrained condition is usually applied to predict the displacement of constructed diaphragm wall (DW) on soft soil during excavation. However, that could not explain the continuous increment of lateral displacement of DW for the large and deep excavation area both during the elapsed time without activity of excavation and after finishing excavation. To study the characteristic behaviors of soil behind the DW during those periods, a series of test on Bangkok soft clay samples was simulated in the same manner as stress condition of soil element happening behind diaphragm wall using triaxial tests. Three kinds of triaxial tests were carried out in this research: K[subscript 0] consolidated undrained compression (CK[subscript 0]UC) and K[subscript 0] consolidated drained/undrained unloading compression with periodic decrement of horizontal pressure (CK[subscript 0]DUC and CK[subscript 0]UUC). The study yields the findings namely the shear strength of series CK[subscript 0]DUC tests is equal to the residual strength of CK[subscript 0]UC tests. The Young’s modulus determined at each decrement step of the horizontal pressure of soil specimen on CK[subscript 0]DUC tests decreases with an increase in deviator stress. The decrement of Young’s modulus (E) with strain level was observed on CK[subscript 0]UC, CK[subscript 0]DUC and CK[subscript 0]UUC tests. The lower bound E values are equal to 46%, 50% and 60% of initial Young’s modulus (E[subscript 0]) on the CK0UC, CK0DUC and CK0UUC tests, respectively. Besides, the slope of Critical State Line of both CK[subscript 0]UC and CK[subscript 0]DUC tests has the same value of 1.5. Moreover, the axial and radial strain rates of each decrement of horizontal pressure step of CK[subscript 0]DUC tests are established with the function of time, slope of critical state line and ratio of deviator and mean effective stress. The test results are beneficial to the prediction of the diaphragm wall deflection during excavation. The 2D-FE analysis for a case study, Bank of Thailand project, was carried out with elastic-perfectly plastic (EPP) and Soft Soil Creep (SSC) models using PLAXIS program. The EPP soil model was applied to predict effectually the lateral displacement of DW on excavation time and elapsed time by the estimated Young’s modulus corresponding to strain level. For the SSC model, the horizontal coefficient of deformation (C[subscript ar]) which could be applied for FE analysis to predict the lateral displacement of DW versus time should be studied further.
DOI: 10.14457/cu.the.2006.1814
title: ปัจจัยที่สัมพันธ์กับเจตคติของครูต่อนักเรียนชายที่มีพฤติกรรมเบี่ยงเบนทางเพศ

description: การวิจัยครั้งนี้ มีวัตถุประสงค์เพื่อศึกษาปัจจัยที่สัมพันธ์กับเจตคติของครูต่อนักเรียนชาย ที่มีพฤติกรรมเบี่ยงเบนทางเพศ กลุ่มตัวอย่างเป็นครูในโรงเรียนระดับมัธยมศึกษา จำนวน 640 คน จากกรุงเทพมหานคร และจังหวัดขอนแก่น คัดเลือกกลุ่มตัวอย่างแบบเฉพาะเจาะจงตามคุณสมบัติ ปัจจัยที่ศึกษามี 21 ปัจจัย แบ่งเป็น 3 กลุ่ม ได้แก่ปัจจัยส่วนบุคคล ปัจจัยทางครอบครัว ปัจจัยทางสังคมและสิ่งแวดล้อม ใช้แบบสอบถามในการเก็บข้อมูล และวัดเจตคติโดยแบบวัดเจตคติต่อบุคคลที่มีพฤติกรรมเบี่ยงเบนทางเพศ วิเคราะห์ข้อมูลด้วยสถิติ Independent Sample t-test และการวิเคราะห์ความถดถอยพหุคูณแบบขั้นตอน ผลการศึกษาพบว่า 1. ครูโรงเรียนระดับมัธยมศึกษาเขตพื้นที่ในเมือง กับครูที่อยู่ในเขตชนบทของจังหวัดขอนแก่น มีเจตคติต่อนักเรียนชายที่มีพฤติกรรมเบี่ยงเบนทางเพศไม่แตกต่างกัน 2. ครูโรงเรียนระดับมัธยมศึกษาในพื้นที่เขตกลางเมืองกับครูที่อยู่ในเขตชาน เมืองรอบนอกของกรุงเทพมหานคร มีเจตคติต่อนักเรียนชายที่มีพฤติกรรมเบี่ยงเบนทางเพศไม่แตกต่างกัน 3. ครูโรงเรียนระดับมัธยมศึกษาในเขตกรุงเทพมหานคร กับครูโรงเรียนระดับมัธยมในเขตจังหวัดขอนแก่น มีเจตคติต่อนักเรียนชายที่มีพฤติกรรมเบี่ยงเบนทางเพศไม่แตกต่างกัน 4. ปัจจัยที่มีความสัมพันธ์กับเจตคติของครูต่อนักเรียนชายที่มีพฤติกรรมเบี่ยง เบนทางเพศอย่างมีนัยสำคัญทางสถิติ (F = 10.427, p &lt; .001) ได้แก่ เพศหญิง ([beta] = .220) การเรียนจบวิชาคหกรรมศาสตร์ ([beta] = -.114) การสอนวิชาวิทยาศาสตร์ ([beta] = .095) การสอนวิชาแนะแนวหรือให้การปรึกษา ([beta] = -.083) และการรับรู้ความสัมพันธ์ระหว่างบิดากับมารดาของครู ([beta] = -.077) โดยทั้ง 5 ปัจจัยนี้ สามารถอธิบายเจตคติของครูได้ร้อยละ 7.0
DOI: 10.14457/cu.the.2006.1815
title: The effect of FDI through local financial market on the economic growth

description: This paper examines how financial development will facilitate FDI in order to promote economic growth. This is, the better-developed financial markets economies are able to benefit more from FDI to accelerate economic growth. This study applies regression analysis to quantitatively measure how the response of growth to FDI varies with the level of development of the financial markets over 1980-2004 periods. This paper uses OECD countries and NON-OECD countries and NON-OECD countries to represent the well and poor functioning financial market, respectively. From the regression results, we can conclude that the different structure of economic development and financial development leads to different ways in order to promote the economic growth. For the OECD countries, which financial markets are well-functioning, comparing with the NON-OECD countries, the financial market development in both banking sector and capital market can stimulate economic growth. Moreover, higher value of market capitalization (CAP) accelerates economic growth by attracting FDI inflows. For the NON-OECD countries, the financial market development and the interaction between financial market and FDI do not have any effect on economic growth. However, one-period lagged FDI plays a major role for accelerating economic growth. Therefore, in order to accelerate the economic growth, the policy maker should investigate whether a country is an OECD country or a NON-OECD country, and apply the appropriate policy. That is, if the country is an OEDC country, the policy maker should pursue the financial market development policy in order to accelerate the economic growth. Conversely, if the country is a NON-OECD country, the policy maker should pursue attracting FDI policy in order to accelerate the economic growth.
DOI: 10.14457/cu.the.2006.1816
title: The empirical analysis of returns predictability of financial rations in Asia-Pacific markets

description: This study investigates predictive ability of financial ratios; namely the dividend to price ratio (D/P) and earnings to price ratio (E/P), in ten Asia-Pacific markets. The sample used in this study covers the period January 1990 through December 2005. Return preductability is also analyzed separately the pre-crisis period (January 1990-June 1997) as well as the post-crisis period (January 2000-December 2005). This study found significant predictive power of the D/P and E/P ratios in Asia Pacific. For D/P, consistent predictive powers are found in both pre and post-crisis period in several countries. There is a likelihood that certain country-specific effects may partly influence the predictability of D/P. Comparing among countries that exhibit D/P predictability, D/P plays an important role in predicting returns in developed markets more than in emerging markets. In comparison to D/P, E/P is a less successful variable. Evidence of E/P predictability is inconsistent and varies across countries and periods. Over the full sample period, evidence of predictive power is stronger for developed markets than for emerging markets.
DOI: 10.14457/cu.the.2006.1817
title: การเก็บกลับคืนโลหะแพลทินัมจากเศษปูนหล่อเครื่องประดับ

description: เศษปูนหล่อที่ได้จากการขึ้นรูปอัญมณีและเครื่องประดับ ย่อมมีโลหะมีค่า เช่น ทองคำ แพลทินัมและเงินหลงเหลืออยู่ หากเป็นชิ้นส่วนที่มีโลหะมีค่าหลงเหลืออยู่ปริมาณมากพอ ก็จะมีการส่งต่อไปยังอุตสาหกรรมรีไซเคิลเพื่อเก็บกลับคืนโลหะมีค่าต่างๆ ต่อไป สำหรับชิ้นส่วนที่มีโลหะมีค่าหลงเหลืออยู่ปริมาณน้อย ก็จะถูกเก็บกองไว้ เป็นภาระในการจัดการ หากสามารถนำเทคโนโลยีการแต่งแร่ทั้งทางกายภาพและทางเคมีมาประยุกต์ใช้ร่วม กันอย่างเหมาะสม จะสามารถเก็บกลับคืนโลหะมีค่าจากชิ้นส่วนเศษปูนหล่อที่มีปริมาณโลหะมีค่าหลง เหลืออยู่ปริมาณน้อยได้อย่างคุ้มค่า การศึกษาครั้งนี้ได้ทดลองนำเทคโนโลยีการแต่งแร่ทั้งทางกายภาพและทางเคมีมา ประยุกต์ใช้เชิงผสมผสานเพื่อนำกลับคืนโลหะแพลทินัมจากเศษปูนหล่อ โดยเริ่มต้นจากการนำเศษปูนหล่อไปอบแห้ง แล้วบดละเอียดจนวัสดุเกิดการแยกตัวกัน จากนั้นทำการคัดแยกด้วยมือ แล้วตามด้วยการคัดขนาดด้วยตะแกรงมาตรฐาน และการคัดแยกด้วยโต๊ะสั่น ตามลำดับ จากนั้นจึงเลือกใช้เฉพาะส่วนหนักและส่วนคละ โดยนำทั้งสองส่วนมารวมกัน แล้วนำไปกำจัดมลทินเหล็กด้วยเครื่องแยกแม่เหล็ก แล้วจึงนำส่วนที่ไม่ติดแม่เหล็กไปทำการละลายในสารละลายกรดกัดทองเพื่อแยก สกัดโลหะแพลทินัมออกจากเศษปูนหล่อ แล้วจึงเก็บกลับคืนโลหะแพลทินัมจากสารละลายด้วยเทคนิคการแทนที่ด้วยโลหะ สังกะสี เปรียบเทียบกับการตกตะกอนด้วยกรดฟอร์มิก ผลการศึกษาพบว่าสภาวะที่เหมาะสมสำหรับการแยกสกัดโลหะแพลทินัมด้วยสารละลาย กรดกัดทอง คือ ใช้กรดกัดทองเข้มข้น 100% ที่อุณหภูมิ 60 [องศาเซลเซียส] เป็นเวลา 12 ชั่วโมง โดยมิได้ทำการกวน สามารถแยกสกัดโลหะแพลทินัมด้วยประสิทธิภาพ 94.32%, 97.71%, และ 99.25% โดยน้ำหนัก เมื่อใช้เศษปูนหล่อเข้มข้น 20%, 10% และ 5% Solid ตามลำดับ โดยพบว่าประสิทธิภาพการแยกสกัดลดลงเหลือเพียง 88.74% เมื่อเพิ่มความเข้มข้นเศษปูนหล่อเป็น 33.5% Solid ดังนั้นจึงควรทำการแยกสกัดโลหะแพลทินัมด้วยสารละลายกรดกัดทองที่ความเข้มข้น ไม่เกิน 20% Solid สำหรับการทดลองเก็บกลับคืนโลหะแพลทินัมจากสารละลายแพลทินัมในกรดกัดทอง ได้ทดลอง 2 เทคนิคเปรียบเทียบกัน ผลการทดลองพบว่าการเก็บกลับคืนด้วยเทคนิคการแทนที่ด้วยโลหะสังกะสี จะได้ผลิตภัณฑ์โลหะแพลทินัมที่มีความบริสุทธิ์สูงกว่า (95.03%Pt) ด้วยประสิทธิภาพการเก็บกลับคืนสูงถึง 93.6% จึงควรเลือกเทคนิคนี้สำหรับการเก็บกลับคืนโลหะแพลทินัมจากสารละลายแพลทินัม ในกรดกัดทอง กล่าวโดยสรุปคือ การนำเทคโนโลยีการแต่งแร่ทั้งทางกายภาพและทางเคมีประยุกต์ใช้ร่วมกันอย่าง เหมาะสม เป็นแนวทางหนึ่งสำหรับการเก็บกลับคืนโลหะมีค่าจากวัสดุเหลือทิ้งที่มีองค์ประกอบโลหะมีค่าปริมาณค่อนข้างต่ำได้ เป็นการส่งเสริมให้เกิดการบริโภคทรัพยากรธรรมชาติอย่างคุ้มค่าและลดปริมาณขยะในเวลาเดียวกัน
DOI: 10.14457/cu.the.2006.1818
title: The understanding and application of the communicative language teaching approach of secondary school teachers in Nakhonpathom Educational Service Area

description: To examine English teachers' understanding and application of communicative language teaching. The population of the study was 242 English secondary school teachers in schools in Nakhonpathom educational service area. The study consisted of two phases: survey and observation, the participants of the study were divided into two groups as well. In the survey, all 242 teachers completed the communicative language teaching knowledge and understanding test. The test was adapted from Uraiwan Saringkanan (1983). It consisted of 22 multiple choice items. The test was used to assess the participants' understanding of communicative language teaching in six aspects: objectives, content, teaching and learning activities, teachers' and learners' roles, materials and assessment. Then, the researcher observed four classes of four participants from the survey phase. COLT was used as an observation checklist. An interview was conducted after each observation. The observation and interview were used to examine the participants' application of communicative language teaching in their classes. The test results showed that teachers in Nakhonpathom understood the concept of communicative language teaching well. The average score was 17.63 (S.D. = 2.53). The total score was 22 points. The participants appear to understand the objective of communicative language teaching the best whereas they understood the aspect of teachers' and learners' roles worst. The results from the observations showed that the participants who had better understanding of communicative language teaching applied the approach more than those who had poorer understanding.
DOI: 10.14457/cu.the.2006.1819
title: Business English oral communication (BEOC) for customer services staff at international banks : translating needs analysis to a course development

description: The study proposed, designed and evaluated a methodology for developing an English course for business oral communication of customer-services staff in international banks by translating the actual learners' needs into course development. The objectives of the study were to identify learners' needs and issues in using English in order to develop a specific English course, and, to evaluate the effectiveness of the course whether it could enhance learners' English oral proficiency, banking vocabulary knowledge and self-confidence in speaking English. The instruments for needs analysis included 174 questionnaires, 14 interviews with customer-services staffs in international banks, 6 interviews with the management in charge and 22 site observations. The course has been validated by 5 experts and the piloted with a group of learner having similar characteristics of the main study group. Both quantitative data were collected for course evaluation. Instruments for quantitative analysis included an oral/speaking test, the use of observed banking vocabulary in context measured by a number of observed vocabulary items used during the oral pre- and post-tests self-assessment of learners' confidence levels and teacher's class observations. Each test and assessment was performed twice i.e. at the beginning of the course and at the end of the course. The teacher's class observation regarding participants' confidence level was conducted in every class. Instruments for qualitative analysis were teacher's log and learners' logs. Both teacher and learners kept records in their logs at the end of each class. The analytical results from t-test revealed that learners gained higher levels of English oral proficiency, increased use of observed banking vocabulary in context, and increased confidence in speaking English at a significant level of 0.05. It was also observed that motivation had a significant role in enabling learners to achieve higher levels of English proficiency. Learners and their management demonstrated positive attitudes towards the learning and the course.
DOI: 10.14457/cu.the.2006.1820
title: Effect of stress-induced anisotropy on elastic shear modulus of sands using bender elements

description: The elastic shear modulus G[subscript max] is a required parameter for analyses of the dynamic and small strain geotechnical problems. The objective of this research was to evaluate the effect of stress-induced anisotropy on elastic shear modulus of a sand specimen by using bender element technique. A number of isotropically and anisotropcally consolidated drained triaxial compression tests were conducted on loose and dense sand specimens. These specimens were prepared by air-pluviation method. In this study, the measurement of shear wave velocity was performed in two phases, i.e., during consolidation and shearing. It was fund that the elastic shear modulus mainly depended on the mean effective stress and void ratio and rather independent of the level of the deviator stress. The elastic shear modulus was affected by consolidation stress ratio K (stress-induced anisotropy) slightly. This was observed for both loose and dense specimens. The results also showed that the paths of G[subscript max] p' during shearing were almost similar to the one that was obtained during consolidation in both isotropic and anisotropic tests. Based on this experimental data, the empirical equation was proposed to express G[subscript max] as a function of the void ratio and the mean effective stress p' for the sand tested.