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PLL Equivalent Augmented System Incorporated with State Feedback Designed by LQR
Somsak Wanchana,Tawom Benjanarasuth,Noriyuki Komine,Jongkol Ngamwiwit 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.2
The PLL equivalent augmented system incorporated with state feedback is proposed in this paper. The optimal value of filter time constant of loop filter in the phase-locked loop control system and the optimal state feedback gain designed by using linear quadratic regulator approach are derived. This approach allows the PLL control system to employ the large value of the phase-frequency gain Kd and voltage control oscillator gain K?. In designing, the structure of phase-locked loop control system will be rearranged to be a phase-locked loop equivalent augmented system by including the structure of loop filter into the process and by considering the voltage control oscillator as an additional integrator. The designed controller consisting of state feedback gain matrix K and integral gain kI, is an optimal controller. The integral gain kI related to weighting matrices q and R will be an optimal value for assigning the filter time constant of loop filter. The experimental results in controlling the second-order lag pressure process using two types of loop filters show that the system response is fast without steady-state error, the output disturbance effect rejection is fast and the tracking to step changes is good.
The Prospect of Korean Reunification
Somsak Keawkingkeo 釜山外國語大學 國際問題硏究所 1994 國際問題論叢 Vol.6 No.-
Korea is a nation with a long history, history, dated back over 5,000years. During the course of its long history ancient Korean rulers adopted the policy of such a contented isolation that it was dubbed a "Hermit Kingdom" adamantly closed against the Western demands for diplomatic and trade relation. In the late 19th century, Korea became the focus of intense imperialist competition among China, Japan and the Russia, As a result, China took over Korea for about 500years, while Japan and the Soviet Union tried to prosper on Korean resources during 1895~1910. And Japan ruled over it from 1910 through 1945, totally 35years.
On interval valued intuitionistic fuzzy hyperideals of ordered semihypergroups
Somsak Lekkoksung,Nareupanat Lekkoksung 강원경기수학회 2020 한국수학논문집 Vol.28 No.4
We introduce the notion of interval valued intuitionistic fuzzy hyperideals, bi-hyperideals and quasi-hyperideals of an ordered semihypergroup. We characterize an interval valued intuitionistic fuzzy hyperideal of an ordered semihypergroup in terms of its level subset. Moreover, we show that interval valued intuitionistic fuzzy bi-hyperideals and quasi-hyperideals coincide only in a particular class of ordered semihypergroups. Finally, we show that every interval valued intuitionistic fuzzy quasi-hyperideal is the intersection of an interval valued intuitionistic fuzzy left hyperideal and an interval valued intuitionistic fuzzy right hyperideal.
On hybrid simple ordered hypersemigroups
Nuchanat Tiprachot,Somsak Lekkoksung,Nareupanat Lekkoksung 원광대학교 기초자연과학연구소 2023 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.26 No.2
Hybrid structures, which combine soft sets and fuzzy sets, offer a valuable approach to studying ordered hypersemigroups by utilizing hybrid hyperideals. In this paper, we propose the concept of hybrid interior hyperideals in ordered hypersemigroups. Additionally, we investigate a specific subset of an ordered hypersemigroup and establish its relationship with a hybrid hyperideal. Furthermore, we introduce the notion of hybrid simple ordered hypersemigroups and explore their connection to simple ordered hypersemigroups. To conclude, we characterize simple ordered hypersemigroups in terms of hybrid interior hyperideals.
Anti-hybrid interior ideals in ordered semigroups
Krittika Linesawat,Somsak Lekkoksung,Nareupanat Lekkoksung 한국전산응용수학회 2022 Journal of applied mathematics & informatics Vol.40 No.3
The main theme of this present paper is to study ordered semigroups in the context of anti-hybrid interior ideals. The notion of anti-hybrid interior ideals in ordered semigroups is introduced. We prove that the concepts of ideals and interior coincide in some particular classes of ordered semigroups; regular, intra-regular, and semisimple. Finally, the characterization of semisimple ordered semigroups in terms of anti-hybrid interior ideals is considered.