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이규헌,김학선 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1
This paper outlines the key RF design parameter for Code Division Multiple Access(CDMA) protocol based PCS Mobile Handsets. Technical challengers pertaining to the receiver and transmitter are discussed. Linearity requirements and characterization for digital wireless communication are discussed with emphasis on CDMA environments. A receiver's dynamic range and sensitivity in the presence of jammers are determined mainly by the linearity of the front-end low noise amplifier and mixer. In the transmitter, the power amplifier is operated in the large signal mode such that the RF current and voltage excursions sweep over active as well as cut-off and saturation regions of the transistors and cause baseband waveform distortion and RF spectral spreading.
차량경로문제(VRP)의 최적루트 설계를 위한 알고리듬 개발에 관한 연구
이규헌 한국경영과학회 1994 한국경영과학회지 Vol.19 No.1
This paper is concerned with the development of tree-search algorithm for the exact solution to the vehicle routing problem (VRP), where set of vehicles of known capacity based at depot, have to be routed in order to supply customers with known requirements. What is required is to design routes, so that the total cost (i. e. total route length or time duration, ect. ) is minimized. For obtaining the exact solution, the most important factors are the value of bound and branching strategy. Using the bound based on with bound ascent procedures from subgradient and state-space ascents, the incorporation of bounds into tree search algorithm to solve the problem is shown. Computational results of the corresponding algorithm show that VRPs with up to 40 customers can be solved optimally with this algorithm.