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.

컴퓨터 비젼에 의한 PCB 검사를 위한 검사 정보 생성 시스템 개발

이철수,고은희,Lee, Cheol-Soo,Go, Eun-Hee 대한산업공학회 1998 산업공학 Vol.11 No.2

For the PCB inspection by computer vision, in some cases, the MRLC file should prepared. The MRLC file contains a RLC(Run Length Code) and a direction flag. In this paper, a generating method of MRLC is described. It is composed of two procedure as followings; (i) rasterizing Gerber file which is a vectorized image of PCB panel, and (ii) calculating a MRLC that is useful for the inspection as a template image. The suggested procedures are written in C-language and executable on Windows 95 and Windows NT.

자동차 타이어 모델의 곡면 모델링 및 5축 NC 가공

이철수,Lee, Cheol-Soo 대한산업공학회 1996 산업공학 Vol.9 No.2

Recently, the tire mold of a passenger car is made almost via aluminum casting, and it is necessary to prepare a master model of the tire for the casting. Because of the geometrical feature of tire, as well known, the master model must be machined by a 5-axis NC machine. The paper proposes a procedure to model and machine the master model. The approach includes (a) transformation of 2D drawing of tire into 3D geometry, (b) modeling surfaces of tire, and (c) inverse kinematics of a 5-axis NC machine. An implementation of the proposed procedure is also presented.

타이어 사이드판의 문자 가공을 위한 4축 가공 시스템

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.

상호 결합을 이용한 광대역 E-면 H 섹터 혼 위상 배열 안테나 설계

이철수,백정기,Lee, Cheol-Soo,Pack, Jeong-Ki 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.6

H 섹터 혼 안테나는 일정한 빔 커버리지를 가지면서 빔 조향을 하는 광대역 위상 배열 송신기의 복사 소자로 유용하다. 본 논문에서는 상호 결합을 이용하여 3:1 주파수 대역과 ${\pm}60^{\circ}$의 빔 조향 범위를 갖는 광대역 E-면 H 섹터 혼 위상 배열 안테나를 설계하였다. 주자계면에서 반전력 빔 폭이 $30{\sim}50^{\circ}$을 갖는 H 섹터 혼 안테나를 설계하였다. 도파관 시뮬레이터를 이용하여 상호 결합을 포함하는 능동 반사 계수를 계산하였고, 광대역 주파수 범위에서 상호 결합에 의하여 능동 반사 특성이 개선되었다. 이러한 결과를 이용하여 $8{\times}1$ H 섹터 혼 위상 배열안테나를 제작하였다. 주자계면에서의 반전력 빔 폭과 능동 반사 계수의 측정 결과는 시뮬레이션 결과와 잘 일치하였다. 빔 조향된 복사 빔들의 첨두치 패턴은 능동 소자 패턴과 잘 일치하였다. 3:1 주파수 대역과 빔 조향 범위에서 능동 반사 계수는 대부분 0.3 이하로 측정되었다. An H-sector horn antenna has a constant beam coverage characteristic and it can be useful for application to a wide band phased array antenna system. In this paper, we designed a broadband E-plane H-sector horn phased-array antenna, which has a 3:1 bandwidth and ${\pm}60^{\circ}$ beam steering capability. An H-sector hem antenna was designed to have $30{\sim}50^{\circ}$ half-power beam width in the principal H-plane. The active reflection coefficient including mutual coupling was calculated using a waveguide simulator, and the active reflection characteristic was improved by mutual coupling over wide frequency range. Using these results, an $8{\times}1$ H-sector phased array antenna was fabricated. The measurement results for the half-power beam width in the principal H-plane and the active reflection coefficient showed a good agreement with the simulation results. The peak-value pattern in the steered radiation beams also agreed well with the active element pattern. The measured active reflection coefficients within the beam steering range are mostly less than 0.3 over the 3:1 frequency range.

피스톤의 형상 모델링 및 CNC 가공 데이터 산출용 소프트웨어 개발

이철수,이제필,김성복,Lee, Cheol-Soo,Lee, Je-Phil,Kim, Seong-Bok 대한산업공학회 1999 산업공학 Vol.12 No.1

A noncircular cutting such as a piston cutting has depended on the copy-machining because of its complex shape. But the copy-machining needs a master model and brings about a low quality of the piston caused by being worn out of the master model. And the lower cutting speed reduces the productivity. In this paper, for solving these problems, a specialized software system and its subsequent procedure are presented. The shape of a piston consists of an oval, an offset, recesses, and eccentricities. The paper describes these shapes as a consistent equation that is a function of the rotational angle and the position of longitudinal direction(Z-axis). It is simple to define the characteristic geometry of a piston and to generate a tool path for CNC machining. This paper proposes the a proper structure of a 4-axes CNC(Computerized Numerical Control) lathe for machining the piston. As well as X-axis and Z-axis, are attached to the machine a C-axis for rotation and a Y-axis for higher speedy prismatic motion parallel to X-axis.

방전드릴링에서 홀 관통 평가 방법

이철수(Cheol-Soo Lee),최인휴(In-Hugh Choi),허은영(Eun-Young Heo),김종민(Jong-Min Kim) 대한산업공학회 2012 대한산업공학회지 Vol.38 No.3

실시간 제어에 의한 개방형 CNC 소프트웨어 모듈의 설계 및 구현

이철수(Cheol-Soo Lee),이제필(Je-Phil Lee) 한국공작기계학회 1999 한국공작기계학회지 Vol.8 No.5

This paper describes the design and implementation of a PC(personal computer) based open architecture machine tool controller. The hardware of open architecture CNC has generally a motion control board on a PC for controlling a servo motor. But this paper describes open architecture hardware that consists of a PC, a counter board, a DAC board, and a DIO board only. This makes it easy to generate CNC software module in a hardware-independent way. The proposed open architecture CNC software runs on the MS-Windows NT. The paper describes a method of con-trolling servo motors using a real-time timer of MS-Windows NT and a commercial real-time operating system on the MS-Windows NT. An open and reconfigurable software module is made up of an object and an API(application programming interface). Using the object and the API, a new CNC system can be quickly configured to control different machine tools. The proposed open architecture CNC system is applied to 4-axis lettering center.

등가 모델을 이용한 광대역 수신용 능동 다이폴 안테나 설계

이철수(Cheol-Soo Lee),백정기(Jeong-Ki Pack) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.1

VHF 대역에서 능동 안테나는 작은 크기로 인하여 많이 사용되고 있다. 능동 안테나는 안테나와 증폭기가 직접 연결되어 있으며, 수신 시스템의 초단부에 위치하고 있으므로, 능동 안테나의 이득 및 잡음 지수 특성은 좋은 감도를 위하여 중요하다. 본 연구에서는 5:1 대역폭(100~500 ㎒)에서 동작하며, 다이폴과 P-HEMT 증폭기로 구성되는 능동 다이폴 안테나를 개발하였다. 능동 다이폴 안테나의 요구된 성능을 얻기 위하여, 안테나와 증폭기를 동시에 설계되어야 한다. 이를 위하여, 1-포트 다이폴 안테나를 등가의 2-포트 시스템으로 모델링하는 등가 포트 개념을 도입하였다. 이러한 제안된 등가 포트를 이용하여 ADS로 능동 다이폴 안테나의 성능에 대한 시뮬레이션 하였다. 안테나의 이득과 잡음 지수 특성을 측정하기 위하여, 2-포트 등가 임피던스 모델을 이용하였다. 제작된 능동 다이폴 안테나의 측정된 평균 이득, 잡음 지수 및 VSWR은 각각 8 ㏈i, 9 ㏈, 1.7:1이다. 방사 패턴은 다이폴 안테나와 같은 특성을 얻었다. 시뮬레이션 결과와 측정된 결과를 비교 시, 제안된 방법의 타당성을 확인하였다. In the VHF range, active antennas are widely used for wideband applications due to their small size. Active antenna consists of antenna elements and amplifiers, which are directly connected to each other. Gain and noise-figure characteristics are very important for good sensitivity performance, because it is located at the front end of a receiving system. In this study, we developed an active dipole antenna with 5:1 bandwidth(100~500 ㎒), which consists of a dipole antenna and a P-HEMT amplifier. To obtain required performances, the antenna and the amplifier should be designed simultaneously. In order for that, we introduced an equivalent port concept to model the 1-port dipole antenna as an equivalent 2-port system. Using the proposed equivalent port, the performance of the active dipole antenna was simulated by the ADS. In order to measure the gain and noise-figure characteristics of the antenna, we utilized the same concept of the two-port equivalent impedance model. The measurement results for typical gain, NF and VSWR in the required frequency band were 8 ㏈i, 9 ㏈ and 1.7:1, respectively. The radiation patterns at the principal planes were same as the typical radiation pattern of a dipole antenna. By comparing the simulation results with measured ones, it is confirmed that the proposed methods works well.

창구단일화·전임자 문제를 둘러싼 사회적 대화 과정과 결과

이철수(Cheol Soo Lee) 한국고용노사관계학회 2010 産業關係硏究 Vol.20 No.2

본 논문은 최근 핫이슈로 재논의되고 있는 창구단일화와 전임자급여지급을 둘러싼 법제도적 쟁점들을 정리해 보고 이를 둘러싼 사회적 대화의 현대적 의미를 재해석해 보기 위해 쓰여졌다. 본 논문은 인접사회과학과의 종합적 토론을 위해 작성된 관계로 법해석학적 도그마틱보다는 법사회학적 접근을 선호한다. 따라서 제도적 이해와 대안 개발에 유의미한 부분에 한정하여 법률적 쟁점을 정리·분석하고 있다. 창구단일화는 여전히 국내적으로 위헌성의 시비로부터 자유로울 수 없다는 점을 전제로 하면서 국제노동기준에의 저촉 여부를 검토하고 필자 나름의 바람직한 제도상을 제시하고 있다. 전임자급여 제도와 관련하여 노사의 주장이 어느 쪽도 원리적 우월성을 가진다고 볼 수 없음을 전제로 국제적 노동기준을 존중하면서도 한국적 풍토에 적합한 모델을 제시하고 있다. 이 문제는 향후 한국의 노사관계의 지형을 바꾸어 놓을 수 있는 위력을 지니고 있고 합리적인 법제도 형성 못지않게 현장에의 소프트 랜딩을 위한 노사관계 이해당사자(stakeholder)의 지혜가 요구되는 사항이기 때문에, 그간의 사회적 대화 과정을 자세히 묘사하면서 사회공학적 차원에서 그간 시도된 사회적 조합주의 모델의 유의미성을 강조하고 있다. This article discusses and analyzes the main legal issues of two-fold question of single channel bargaining system and a full-time union official, on which the Korean society has underwent more than a decade of hot debate. It is important to interpret and understand its modern implications. The article aims to facilitate conversation between diverse branches of sociologic studies, so that a multi-dimensional solution can be reached regarding the debated systems. The author prefers a legal-sociologic approach to the problems, rather than using dogmatic interpretations of black letter laws. The readers are advised to be reminded that the discussion is limited to several legal points that are relevant to drawing practical solutions. On the first issue of the single channel bargaining, despite its evolvement in recent years, the current Korean system still poses unconstitutional aspects. The author analyzes whether it also violates international labor standards, and then suggests an alternative to the current system. On the second issue of a full-time union official system, the author points out that neither the employer nor the employee’s argument deserves meritorious claim. The author emphasizes compliance to international standards, while proposing an adaptable model to Korean labor culture. These issues are extremely important in the aspect that it can bring out a total change of Korean labor relations matters. In order to achieve a smoother application to real-life labor disputes, a prudent attitude from the stakeholders is desperately required. This is the reason why the author analyzes in details how previous social dialogues have evolved in the past, using the notion of social corporatisms a recurring theme of the debates.