한글 배리어블 폰트의 개발 과정과 효용성에 관한 연구 –‘가로산스’개발 사례를 중심으로-

이철권,박윤정 한국기초조형학회 2023 기초조형학연구 Vol.24 No.5

This study is based on the development of a sans-serif variable Hangeul font, focusing on the development of a font family with weight, shape changes using variable font production technology. The purpose of this study is to expand the range of user choices through possibilities and efficient development of expanded Hangul variable fonts called ‘letterform shape variation that change depending on weight’. With the proliferation of personal devices such as PC’s and smart-phones, the use of screen-based fonts has increased. These fonts have been applied as a means of self-expression, reflecting user’s personalities, preferences and demands. Like traditional font families, variable fonts have fundamental design axes such as weight, width, slant, and optical size, but they possess the unique feature of allowing users to modify and select variations according to their particular needs. ‘Garosans’, developed by the researcher, is an example of applying interpolation by adding morphological change elements using the wide space of consonants based on the transformation axis of the font family. The focus is on formative experiments through morphological changes in weights of four font families, while maintaining functionality as letters. This is done by understanding the anatomical structure of the basic Hangeul characters and considering the characteristics of each part of the letters. Through interpolation between Light and Bold master fonts, 2,780 Korean characters, 94 Latin alphabets and punctuation marks in Regular and Medium were automatically derived. ‘Garosans’, has since been recognized and picked up by a font foundry, awaiting commercialization. As it is the first variable font that emphasizes horizontal strokes, we plan to expand the highly useful variable font by utilizing the vertical axis in the future as Garosans 2.0. We hope that the possibility of variable fonts will be verified through the formative experiments and development Garosans and that it will contribute to production of Hangeul-based variable fonts, further expanding and developing the scope of Hangeul fonts.

원전 이차계통 파이프 감육상태 분석를 위한 적응 콘-커널 시간-주파수 분포함수

이철권,김정택,이상정 대한전기학회 2006 전기학회논문지 D Vol.55 No.3(D)

- The secondary system of nuclear power plants consists of sophisticated piping systems operating in very aggressive erosion and corrosion environments, which make a piping system vulnerable to the wear and degradation due to the several chemical components and high flow rate (~10 m/sec) of the coolant. To monitor the wear and degradation on a pipe, the vibration signals are measured from the pipe with an accelerometer. For analyzing the vibration signal the time-frequency analysis (TFA) is used, which is known to be effective for the analysis of time-varying or transient signals. To reduce the interferences (cross-terms) due to the bilinear structure of the time-frequency distribution, an adaptive cone-kernel distribution (ACKD) is proposed. The cone length of ACKD to determine the characteristics of distribution is optimally selected through an adaptive algorithm using the normalized Shannon’s entropy. And the ACKD’s are compared with the results of other analyses based on the Fourier Transform (FT) and other TFA’s. The ACKD shows a better signature for the wear/degradation within a pipe and provides the additional information in relation to the time that any analysis based on the conventional FT can not provide.

원전 계측제어시스템 사이버보안 기술동향

이철권(Lee Cheol Kwon) 한국정보보호학회 2012 情報保護學會誌 Vol.22 No.5

원자력발전소(원전) 계측제어시스템은 원전을 안전하게 운전하기 위해 계측, 제어 및 보호, 감시 기능을 수행하는 설비로서, 2000년대에 들면서 아날로그 기술에서 컴퓨터와 데이터통신망을 기반으로 하는 디지털 기술로 변하고 있다. 디지털 기술의 도입은 원전에 많은 이점을 부여하였지만 한편으로는 최근 이란 핵시설 및 중국에서 발생한 사이버 사고를 통해 디지털 계측제어시스템이 사이버공격으로부터 취약함이 입증되었다. 이에 따라 사이버보안 기술을 도입하여 원전의 안전성을 확보하기 위한 방안이 요구되고 있다. 하지만 원전 계측제어시스템의 최상위 설계요건으로 요구되는 안전성 확보는 복잡한 기기검증 절차와 긴 시간이 요구되는 인허가 과정 등으로 인해 사이버보안 기술을 적용하는데 많은 어려움이 따른다. 본 논문에서는 원전 계측제어시스템의 특성을 살펴보고 현재 국내외에서 개발 및 적용중인 원전 사이버보안 기술동향을 소개한다.

원전 이차계통 파이프 감육상태 분석을 위한 적응 콘-커널 시간-주파수 분포함수

李喆權(Cheol-Kwon Lee),金楨宅(Jung-Taek Kim),李相禎(Sang-Jeong Lee) 대한전기학회 2006 전기학회논문지 D Vol.55 No.3

The secondary system of nuclear power plants consists of sophisticated piping systems operating in very aggressive erosion and corrosion environments, which make a piping system vulnerable to the wear and degradation due to the several chemical components and high flow rate (~10 m/sec) of the coolant. To monitor the wear and degradation on a pipe, the vibration signals are measured from the pipe with an accelerometer. For analyzing the vibration signal the time-frequency analysis (TFA) is used, which is known to be effective for the analysis of time-varying or transient signals. To reduce the interferences (cross-terms) due to the bilinear structure of the time-frequency distribution, an adaptive cone-kernel distribution (ACKD) is proposed. The cone length of ACKD to determine the characteristics of distribution is optimally selected through an adaptive algorithm using the normalized Shannon's entropy. And the ACKD's are compared with the results of other analyses based on the Fourier Transform (FT) and other TFA's. The ACKD shows a better signature for the wear/degradation within a pipe and provides the additional information in relation to the time that any analysis based on the conventional FT can not provide.

조직형태학적 분석을 통한 아래이틀신경 내 턱끝가지의 형태학적 배열

이철권 ( Chul Kwon Lee ),이명화 ( Myoung Hwa Lee ),모신엽 ( Shin Yeob Mo ),이동설 ( Dong Seol Lee ),유선경 ( Sun Kyoung Yu ),조광희 ( Kwang Hee Cho ),김흥중 ( Heung Joong Kim ) 조선대학교 치의학연구원 2013 Oral Biology Research (Oral Biol Res) Vol.37 No.2

Purpose: The inferior alveolar nerve (IAN) is vulnerable to injury from implant placement and surgical procedures in the mandibular region. The purpose of this study was to measure and assess the relative areas, bundle numbers, and locations of the mental branch (MB) and dental branch (DB) within IAN. Materials and Methods: Twenty dentulous hemimandibles were examined (eight males and two females, mean age: 58.2 years). Hemimandibles were decalcified for 10 days, after which the specimens were embedded in paraffin and cut at a thickness of 8 μm. The sections were then stained with hematoxylin & eosin and then observed by light microscopy. The areas, bundle numbers, and locations of the MB and DB were measured using image analysis software applied to histological photographs. Results: The MB showed a tendency to maintain its area, whereas the area of the DB, which gave off branches to each tooth traveling within the mandibular canal, decreased toward the anterior tooth. The MB usually comprised four nerve bundles, each wrapped in the perineurium. Based on the location of the MB, the DB was located superobuccally in the molar region and traveled superolingually in the premolar region. Conclusion: These results show that the IAN consists of two major nerve bundles in which the MB and DB are separately enveloped in the perineurium, and the area of the MB is larger in comparison with that of the DB. Therefore, more careful surgical procedures in the mandibular region are needed to avoid nerve injury.

IAEA 주관 원자력시설 사이버사건 분석 및 대응능력 강화에 관한 국제공동연구

이철권(Lee, Cheol Kwon) 한국정보보호학회 2019 情報保護學會誌 Vol.29 No.2

이 글에서 IAEA 핵안보(정보보안) 부서의 원자력시설에 대한 사이버보안 활동과 함께 2016년부터 13개국 17개 기관이 협력하여 수행중인 “원자력시설 사이버사건 분석 및 대응 능력 강화에 관한 국제공동연구”에 대해 소개하고자 한다.

3-dimensional reconstruction of mandibular canal at the interforaminal region using microcomputed tomography in Korean

전용현,이철권,김희중,정재헌,김흥중,유선경 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.6

PURPOSE. The purpose of this study was to identify the complex course of the mandibular canal using 3D reconstruction of microCT images and to provide the diagram for clinicians to help them understand at the interforaminal region in Korean. MATERIALS AND METHODS. Twenty-six hemimandibles obtained from cadavers were examined using microCT, and the images were reconstructed. At both the midpoint of mental foramen and the tip of anterior loop, the bucco-lingual position, the height from the mandibular inferior border, the horizontal distance between two points, and position relative to tooth site on the mandibular canal were measured. The angle that the mental canal diverges from the mandibular canal was measured in posteriorsuperior and lateral-superior direction. RESULTS. The buccal distance from the mandibular canal was significantly much shorter than lingual distance at both the mental foramen and the tip of anterior loop. The mandibular canal at the tip of anterior loop was significantly located closer to buccal side and higher than at the mental foramen. And the mental canal most commonly diverged from the mandibular canal below the first premolar by approximately 50º posterior-superior and 41º lateral-superior direction, which had with a mean length of 5.19 mm in front of the mental foramen, and exited to the mental foramen below the second premolar. CONCLUSION. These results suggest that it could form a hazardous tetrahedron space at the interforaminal region, thus, the clinician need to pay attention to the width of a premolar tooth from the mental foramen during dental implant placement.

SMART MMIS 개발을 위한 설계현안 정보시스템

박근욱,이철권,구인수,차경호,장문희 대한산업공학회 1998 대한산업공학회 추계학술대회논문집 Vol.1998 No.10

KNICS 개발 개념

김동훈,이철권,신재활,김영백,권순만,송성일 대한전기학회 2003 전기의 세계 Vol.52 No.9

3D-reconstruction and anatomical analysis of the mental canal using MicroCT in the interforaminal region

유선경,이철권,김흥중 대한체질인류학회 2016 대한체질인류학회 학술대회 연제 초록 Vol.59 No.-