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이철수,박광렬,Lee, Cheol-Soo,Park, Gwang-Ryeol 대한산업공학회 1998 산업공학 Vol.11 No.2
The letters of the automobile tire are usually engraved on the side-wall. The shape of the side-wall is a sculptured surface generated by the rotational sweeping of a profile curve. The letters laid on the side-wall are usually designed by a 2-dimensional CAD. It is impossible to machine the letters on the surface accurately by 3-axis NC machining, because the axis of cutter should be tilted to align with the normal vector of the surface. In this case. the degree of freedom for the machine is at least four. This paper describes an idea for tool path generation of a 4-axis machine by using the 2-dimensional CAD data of the letters and the surface of the side-wall. This study includes the following procedures; (1) measuring the profile of the side-wall surface and curve-fitting of the measured points. (2) the 'non-parallel projection' of the letters on the side-wall, and (3) an inverse kinematics of the 4-axis lettering machine. Procedures in this paper are programmed in C-language on Windows95 environment. With a PC based CNC controller and a 4-axis lettering machine. these are tested sucessfully for the practical use.
선박용 플랫바의 자동 네스팅 및 가스/플라즈마에 의한 NC 절단
이철수,박광렬,Lee, Cheol-Soo,Park, Gwang-R. 대한산업공학회 1996 산업공학 Vol.9 No.3
The 'flat-bar' is a stiffener which is a component of ships. It is basically a long rectangle and has 'end-cut' shapes at both sides. The paper describes a fast nesting algorithm of the flat-bar, and a procedure to generate cutting path of gas/plasma torch, which is operated by a NC (numerically controlled) gas/plasma cutting machine. Proposed procedures are written in C-language and executable on VAX machine with Open VMS operating system.
Vector Fitting기법을 이용한 필터링 전도체 비발디 안테나의 등가회로 구현
이철수(Cheolsoo Lee),유홍균(Hongkyun Ryu),박범준(Beomjun Park),김인선(Inseon Kim),박주래(Joorae Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
An equivalent circuit model is demonstrated of the wideband metallic Vivaldi array antenna with band notched performance using vector fitting technique (VFT). The metal post placed in the resonator for broadband impedance matching is achieved band stop function. A numerical S11 characteristic of the filtering Vivaldi antenna is calculated using CSTMWS and the rational terms are driven using ‘rational’ function of MATLAB. The results of the reflection of the equivalent circuit using ADS, the frequency response of rational terms of VFT and CST-MWS are agreed well each other.
이철수 ( Chul Soo Lee ),박석천 ( Seok Cheon Park ),정연수 ( Yeon Soo Jung ),류도 ( Do Ryu ),최희선 ( Hee Seon Choi ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2
개인 정보라 함은 생존하는 개인에 관한 정보로서 당해 정보에 포함되어 있는 성명, 주민등록번호 등의 사항에 의하여 개인을 식별할 수 있는 정보를 말한다. 하지만 개인정보의 이용가치에 비해 오·남용시 개인의 인격적·재산적 권익 손상에 대한 심각성 인식은 부족한 실정이다. 따라서 본 논문에서는 개인정보보호 방침의 중요성과 개념을 분석하고 국가별 개인정보관리현황을 조사분석하여 최종적으로 개인정보보호 방침 등록제도 도입방안을 제안한다.