Assistant Professor Tuptim Angkaew, D.Eng
ผศ. ดร.ทับทิม อ่างแก้ว
Education
- D.Eng. (Electrical Communication Engineering) Osaka University, Japan, 1990.
- M.Eng. (Electrical Communication Engineering) Osaka University, Japan, 1987.
- Certificate in Japanese Language, Osaka University, Japan, 1984.
- B.Eng. (Electrical Engineering) King Mongkut?s Institute of Technology, Ladkrabang, Thailand, 1984.
Email: tuptim.a@chula.ac.th
Research Interest
- Numerical analysis and design of microwave and lightwave guiding components.
- Finite element method and applications in electromagnetic field analysis.
- Boundary element method and applications in electromagnetic field analysis.
- Numerical analysis of optical transmission in optical fiber comunication systems.
Research Cluster
1.
Prapasawasdi, U; Wuttisittikulkij, L; Borompichaichartkul, C; Changkaew, L; Saadi, M
Cultural tourism behaviors: Enhancing the influence of tourists’ perceptions on local thai food and culture Journal Article
In: Open Psychology Journal, vol. 11, no. 1, pp. 184-197, 2018, ISSN: 18743501, (cited By 1).
@article{Prapasawasdi2018,
title = {Cultural tourism behaviors: Enhancing the influence of tourists’ perceptions on local thai food and culture},
author = {U Prapasawasdi and L Wuttisittikulkij and C Borompichaichartkul and L Changkaew and M Saadi},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85056265888&doi=10.2174%2f1874350101811010184&partnerID=40&md5=0b94ad39327c034df02853987de8b70c},
doi = {10.2174/1874350101811010184},
issn = {18743501},
year = {2018},
date = {2018-01-01},
journal = {Open Psychology Journal},
volume = {11},
number = {1},
pages = {184-197},
publisher = {Bentham Science Publishers B.V.},
abstract = {Background: Tourist behavior plays a principle role in preserving the cultural heritage and supporting the economy of the local community. Local food is a significant factor for tourists and an important cultural aspect distinguishing one country from one another. To understand tourists' food decision making, this study investigates tourists’ perceptions of local food. Methods: A mixed-method methodology used a concurrent transformative strategy. Qualitative research comprised in-depth interviews conducted with 15 local food specialists and 10 tourists; quantitative comprised survey structured questionnaires with a sample of 400 tourists travelling in Chiangmai, Thailand. Findings: The result revealed that tourists’ perceptions comprising attitude, subject norm, perceived value and expectation factors positively affected the perception toward local food information. Regression analysis suggested that the four variables contributed 53.4% to the variation of local food. By employing the standardized coefficients as mentioned, the linear regression model was Y = 0.424A-0.201S+0.428E+0.234P. Conclusion: Four factors affected tourists’ perceptions towards local food as follows: (1) expectation towards local food information via media, (2) attitude of tourists towards local food, (3) perceived value of local food with the benefit, belief and nutrition of local food, and (4) subject norm towards local food; local food experts influence to tourists. All the factors lead tourists to perceive in local food and culture. © 2018 Prapasawasdi et al.},
note = {cited By 1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Background: Tourist behavior plays a principle role in preserving the cultural heritage and supporting the economy of the local community. Local food is a significant factor for tourists and an important cultural aspect distinguishing one country from one another. To understand tourists' food decision making, this study investigates tourists’ perceptions of local food. Methods: A mixed-method methodology used a concurrent transformative strategy. Qualitative research comprised in-depth interviews conducted with 15 local food specialists and 10 tourists; quantitative comprised survey structured questionnaires with a sample of 400 tourists travelling in Chiangmai, Thailand. Findings: The result revealed that tourists’ perceptions comprising attitude, subject norm, perceived value and expectation factors positively affected the perception toward local food information. Regression analysis suggested that the four variables contributed 53.4% to the variation of local food. By employing the standardized coefficients as mentioned, the linear regression model was Y = 0.424A-0.201S+0.428E+0.234P. Conclusion: Four factors affected tourists’ perceptions towards local food as follows: (1) expectation towards local food information via media, (2) attitude of tourists towards local food, (3) perceived value of local food with the benefit, belief and nutrition of local food, and (4) subject norm towards local food; local food experts influence to tourists. All the factors lead tourists to perceive in local food and culture. © 2018 Prapasawasdi et al.
2.
Kaewplung, P; Angkaew, T; Kikuchi, K
In: Journal of Lightwave Technology, vol. 21, no. 6, pp. 1465-1473, 2003, ISSN: 07338724, (cited By 16).
@article{Kaewplung2003,
title = {Simultaneous suppression of third-order dispersion and sideband instability in single-channel optical fiber transmission by midway optical phase conjugation employing higher order dispersion management},
author = {P Kaewplung and T Angkaew and K Kikuchi},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041418228&doi=10.1109%2fJLT.2003.812462&partnerID=40&md5=6394e75e2fb991c7a3b00ff1f4863a1b},
doi = {10.1109/JLT.2003.812462},
issn = {07338724},
year = {2003},
date = {2003-01-01},
journal = {Journal of Lightwave Technology},
volume = {21},
number = {6},
pages = {1465-1473},
abstract = {In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband instability (SI) mainly limit the transmission performance. We propose, for the first time, a scheme for simultaneous suppression of both TOD and SI in OPC systems using a periodic higher order dispersion-managed link consisting of standard single-mode fibers (SMFs) and reverse dispersion fibers (RDFs). Computer simulation results demonstrate the possibility of 200-Gb/s data transmission over 10000 km in the higher order dispersion-managed OPC system, where the dispersion map is optimized by our system design strategies.},
note = {cited By 16},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband instability (SI) mainly limit the transmission performance. We propose, for the first time, a scheme for simultaneous suppression of both TOD and SI in OPC systems using a periodic higher order dispersion-managed link consisting of standard single-mode fibers (SMFs) and reverse dispersion fibers (RDFs). Computer simulation results demonstrate the possibility of 200-Gb/s data transmission over 10000 km in the higher order dispersion-managed OPC system, where the dispersion map is optimized by our system design strategies.
3.
Kaewplung, P; Angkaew, T; Kikuchi, K
In: Journal of Lightwave Technology, vol. 20, no. 11, pp. 1895-1907, 2002, ISSN: 07338724, (cited By 14).
@article{Kaewplung2002,
title = {Complete analysis of sideband instability in chain of periodic dispersion-managed fiber link and its effect on higher order dispersion-managed long-haul wavelength-division multiplexed systems},
author = {P Kaewplung and T Angkaew and K Kikuchi},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036875185&doi=10.1109%2fJLT.2002.806365&partnerID=40&md5=e65a676fecc59d379cc4cc3e1d75ccf7},
doi = {10.1109/JLT.2002.806365},
issn = {07338724},
year = {2002},
date = {2002-01-01},
journal = {Journal of Lightwave Technology},
volume = {20},
number = {11},
pages = {1895-1907},
abstract = {We present for the first time a complete theoretical analysis of sideband instability (SI) that occurs when two kinds of fibers with different characteristics are concatenated to form a dispersion-managed fiber link. In the analysis, the following three cases are taken into account: case (a) when a dispersion-management period is larger than an amplification period, case (b) when the two lengths are equivalent, and case (c) when a dispersion-management period is smaller than an amplification period. We find that the SI gain peak appears at frequencies determined by the larger of the two variation periods. Moreover, for all three cases, the magnitude of the SI gain reduces with the increase in strength of dispersion management. Next, we focus on the fiber link using the combination of standard single-mode fiber and reverse dispersion fiber, which is widely used for simultaneously compensating second- and third-order dispersion. By computer simulation, it is shown that in wavelength-division-multiplexed systems, SI still induces significant degradation in channels located at frequencies where SI induced from other channels arises. By reallocating the channel frequency to avoid the SI frequency, the transmission performance is improved significantly.},
note = {cited By 14},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present for the first time a complete theoretical analysis of sideband instability (SI) that occurs when two kinds of fibers with different characteristics are concatenated to form a dispersion-managed fiber link. In the analysis, the following three cases are taken into account: case (a) when a dispersion-management period is larger than an amplification period, case (b) when the two lengths are equivalent, and case (c) when a dispersion-management period is smaller than an amplification period. We find that the SI gain peak appears at frequencies determined by the larger of the two variation periods. Moreover, for all three cases, the magnitude of the SI gain reduces with the increase in strength of dispersion management. Next, we focus on the fiber link using the combination of standard single-mode fiber and reverse dispersion fiber, which is widely used for simultaneously compensating second- and third-order dispersion. By computer simulation, it is shown that in wavelength-division-multiplexed systems, SI still induces significant degradation in channels located at frequencies where SI induced from other channels arises. By reallocating the channel frequency to avoid the SI frequency, the transmission performance is improved significantly.
4.
Kaewplung, P; Angkaew, T; Kikuchi, K
In: IEEE Photonics Technology Letters, vol. 13, no. 4, pp. 293-295, 2001, ISSN: 10411135, (cited By 7).
@article{Kaewplung2001a,
title = {Feasibility of 100-Gb/s 10000-km single-channel optical transmission by midway optical phase conjugation incorporated with third-order dispersion compensation},
author = {P Kaewplung and T Angkaew and K Kikuchi},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035305138&doi=10.1109%2f68.917829&partnerID=40&md5=333c54a3c0dae3cf2ba90cb413edf8c1},
doi = {10.1109/68.917829},
issn = {10411135},
year = {2001},
date = {2001-01-01},
journal = {IEEE Photonics Technology Letters},
volume = {13},
number = {4},
pages = {293-295},
abstract = {In optical phase conjugation systems, the third-order dispersion of fibers almost linearly accumulates along the transmission distance, and the distortion induced from the third-order dispersion can be perfectly compensated by using a linear third-order dispersion compensator placed at any point of the system. We demonstrate by numerical simulations that 100-Gb/s single-channel transmission can be achieved over a 10,000-km distance in midway optical phase conjugation transmission systems by compensating the third-order dispersion.},
note = {cited By 7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In optical phase conjugation systems, the third-order dispersion of fibers almost linearly accumulates along the transmission distance, and the distortion induced from the third-order dispersion can be perfectly compensated by using a linear third-order dispersion compensator placed at any point of the system. We demonstrate by numerical simulations that 100-Gb/s single-channel transmission can be achieved over a 10,000-km distance in midway optical phase conjugation transmission systems by compensating the third-order dispersion.
5.
Matsuhara, M; Angkaew, T
Vector basis functions in mixed-potential integral equation method Journal Article
In: Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi), vol. 79, no. 10, pp. 49-55, 1996, ISSN: 8756663X, (cited By 0).
@article{Matsuhara1996,
title = {Vector basis functions in mixed-potential integral equation method},
author = {M Matsuhara and T Angkaew},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030258241&doi=10.1002%2fecjb.4420791006&partnerID=40&md5=b7d0be843513c1c5f9d55b396d34a946},
doi = {10.1002/ecjb.4420791006},
issn = {8756663X},
year = {1996},
date = {1996-01-01},
journal = {Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)},
volume = {79},
number = {10},
pages = {49-55},
publisher = {John Wiley and Sons Inc.},
abstract = {The mixed potential integral equation (MPIE) is one of the principal numerical analysis methods used for the computer-aided design of microwave and millimeterwave integrated circuits. In this paper, a systematic method for constructing the vector basis functions used in the MPIE is described and application examples are presented. A systematic technique for constructing the first- and second-order vector basis functions is presented. This method is applied to the MPIE for numerical analysis of a patch antenna; the results demonstrate the validity and the effectiveness of the vector basis functions.},
note = {cited By 0},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The mixed potential integral equation (MPIE) is one of the principal numerical analysis methods used for the computer-aided design of microwave and millimeterwave integrated circuits. In this paper, a systematic method for constructing the vector basis functions used in the MPIE is described and application examples are presented. A systematic technique for constructing the first- and second-order vector basis functions is presented. This method is applied to the MPIE for numerical analysis of a patch antenna; the results demonstrate the validity and the effectiveness of the vector basis functions.