Development of Thermal Error Model with Minimum Number of Variables Using Fuzzy Logic Strategy

이진현,이재하,양성한,Lee, Jin-Hyeon,Lee, Jae-Ha,Yang, Seong-Han 대한기계학회 2001 KSME International Journal Vol.15 No.11

Thermally-induced errors originating from machine tool errors have received significant attention recently because high speed and precise machining is now the principal trend in manufacturing proce sses using CNC machine tools. Since the thermal error model is generally a function of temperature, the thermal error compensation system contains temperature sensors with the same number of temperature variables. The minimization of the number of variables in the thermal error model can affect the economical efficiency and the possibility of unexpected sensor fault in a error compensation system. This paper presents a thermal error model with minimum number of variables using a fuzzy logic strategy. The proposed method using a fuzzy logic strategy does not require any information about the characteristics of the plant contrary to numerical analysis techniques, but the developed thermal error model guarantees good prediction performance. The proposed modeling method can also be applied to any type of CNC machine tool if a combination of the possible input variables is determined because the error model parameters are only calculated mathematically-based on the number of temperature variables.

마이오세 포항분지 시추코어의 구성광물과 분포특성

이진현,황진연,손문,손병서,오지호,이효민,Lee, Jinhyun,Hwang, Jinyeon,Son, Moon,Son, Byeong Seo,Oh, Jiho,Lee, Hyomin 한국광물학회 2017 광물과 암석 (J.Miner.Soc.Korea) Vol.30 No.3

이산화탄소 지중저장 실증연구를 위하여 마이오세 포항분지의 연일층군에서 굴착한 2곳의 시추코어 시료에 대해 X-선회절분석을 통하여 구성광물을 분석하였다. 그 결과, 석영, 사장석, 정장석, Opal-CT, 스멕타이트, 운모, 일라이트, 카올린광물, 녹니석, 방해석, 석고, 황철석, 돌로마이트, 능철석 등의 다양한 광물이 나타났다. 스멕타이트는 대부분의 시료에서 산출되고 있으며, 하부에서 비교적 많이 함유되었다. 상부지층에 주로 산출하는 Opal-CT는 비정질 규조의 속성작용에 의한 것으로, 깊이에 따라 크리스토발라이트의 d(101) 값이 $4.10{\AA}$에서 $4.05{\AA}$으로 대체적으로 감소하는 경향이 나타났다. 두 시추공에서 광물성분의 분포가 서로 유사하게 대비되어, 거의 같은 퇴적환경에서 형성된 것으로 생각된다. 스멕타이트가 대부분의 심도에서 상당량 함유되어 있으므로, 이들 지층은 이산화탄소의 지중저장시 덮개암의 역할을 할 수 있을 것으로 판단된다. In order to investigate the geological storage potential of $CO_2$, X-ray diffraction analysis were conducted for drilling core samples collected from the two drilling sites located in Yonil group of the Miocene Pohang Basin. As a result, various minerals were identified such as quartz, plagioclase, orthoclase opal-CT, smectite, mica, illite, kaolin mineral, chlorite, calcite, gypsum, pyrite, dolomite, and siderite. Smectite was detected in almost all of core samples, and relatively large amounts of smectite were observed in the cores from deeper strata. Opal-CT, mainly occurred in the upper interval of cores, was formed by diagenesis of amorphous diatoms. It shows a tendency that d101 value of cristobalite decreases with depth from $4.10{\AA}$ to $4.05{\AA}$. The almost identical variations in mineral composition with depth are observed at the two sites. This fact indicates that rocks distributed at the two sites were probably deposited in the similar depositional environments. It is determined that the strata in the study area can play roles of cap-rock for $CO_2$ storage, because the considerable amounts of smectite were contained in the rocks through the cores.

일제강점기 대구의 토목건축청부업자에 관한 연구

이진현,Lee, Jin-Hyun 한국건축역사학회 2010 건축역사연구 Vol.19 No.6

This article is about the study on construction contractors in Daegu during the Japanese Colonial Rule. The first construction contractors who involved with Kyong-bu railroad work in 1904 personally. But, after they go through the bidding method, changed by the Japanese Government General of Korea in 1922, and the second bid rigging in 1932, contractors was changed gradually the organization into unlimited partnership, limited partnership or stock corporation. The number of them was increased. Most contractors were Japanese, and organized a limited partnership which has been capitalized at 30,000 won. On the other hand, Korean contractors couldn't work at an important part, except for the personal activities of Youngsil Lee(李永實). They were usually employed as consultants or field deputies by Japanese contractors. After the Liberation, Japanese construction contractors returned to Japan, however Tatuoka-kumi(龍岡組), Yasiro-kumi(屋代組) and Sakano-kumi(坂野組) that was leading the business which were took over by Koreans. They were leading architecture field in Daegu.

단순 방사선 영상 검사를 통한 추나의학적 진단 방법 - 척추.골반변위 명명체계를 중심으로 -

이진현,김창곤,조동찬,문수정,박태용,고연석,남항우,이정한,Lee, Jin-Hyun,Kim, Chang-Gon,Jo, Dong-Chan,Moon, Su-Jeong,Park, Tae-Young,Ko, Youn-Suk,Nam, Hang-Woo,Lee, Jung-Han 척추신경추나의학회 2014 척추신경추나의학회지 Vol.9 No.1

Objective : The purpose of this study is to offer a new approach to diagnostic X-ray in perspective of Chuna manual medicine for clinical application. Methods : Characteristics of each malposition in X-ray were analyzed comprehensively, based on the listing system. By verifying these results, find out the methods of X-ray diagnosis according to the each malposition. Results : 1. Vertebral malposition can be explained by alignment and relative position of vertebral body in the X-ray. To obtain more accurate estimation of subluxation, features of other structures should be considered, such as spinous process, intervertebral foramen and disc space. 2. Pelvic malposition can be determined by relative location of anterior superior iliac spine (ASIS) and posterior superior iliac spine (PSIS) in the X-ray. Also other pelvic parameters should be utilized to make a diagnosis of sacral malposition. Conclusions : Diagnostic X-ray should be applied to many clinicians for reasonable Chuna manual medicine application. And further studies are needed to use the diagnostic X-ray in the perspective of Chuna manual medicine.

요통 환자의 요천추 및 골반 지표 분석

이진현 ( Jin Hyun Lee ),조동찬 ( Dong Chan Jo ),김창곤 ( Chang Gon Kim ),문수정 ( Su Jeong Moon ),박태용 ( Tae Yong Park ),고연석 ( Youn Suk Ko ),이수경 ( Su Kyung Lee ),송용선 ( Yung Sun Song ),이정한 ( Jung Han Lee ) 한방재활의학과학회 2013 한방재활의학과학회지 Vol.23 No.2

Objectives : The aim of this study was to investigate the characteristic of low back pain(LBP) and lumbosacral-pelvic alignments, and the relationship between them, depending on the presence and the duration of LBP. Methods : Ninety six patients were classified into the no LBP group(n=31), the acute LBP group(n=33) and the chronic LBP group(n=32), based on the presence and duration of LBP. In each group, lumbosacral-pelvic indicators were measured. The data were analysed by one way analysis of variance(ANOVA) and pearson correlation. Results : 1. The chronic LBP group showed the lower mean value in Ferguson angle, Lumbar lordosis angle, Pelvic Incidence and difference between left and right iliac height, being compared to acute LBP group.2. There was not significant correlation between lumbosacral-pelvic alignments and LBP in every group.3. A positive correlation was found among period of LBP and visual analogue scale(VAS), Oswestry disability index(ODI). Conclusions : For presence and duration of LBP, there were different characteristic values in descriptive statistics. And period of LBP is the most important factor for the degree of LBP. These results show that the lumbosacral-pelvic alignments and LBP have distinctive relationships depending on the duration of LBP.

최근 3년간 장애인보조기기 교부사업 수행에 따른 내구연한에 대한 고찰

이진현(J. H. Lee),임성빈(S. B. Yim),이상혁(S. H. Lee),이근민(K. M. Lee) 한국재활복지공학회 2022 한국재활복지공학회 학술대회논문집 Vol.2022 No.11

코로나-19 상황에서 상담전공 학부생의 비대면 집단상담 실습 경험

이진현(Lee, Jinhyun),오민정(Oh, Minjung),이성욱(Lee, Seonguk),이혜진(Lee, Hyejin),김수임(Kim, Sooim) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.8

목적 본 연구는 코로나-19 상황에서 상담전공 학부생들의 비대면 집단상담 실습 경험을 탐구하고, 비대면 집단상담 실습수업의 가능성과 한계를 살펴보고자 한다. 방법 이를 위하여 경기도 소재 대학교 집단상담을 수강하는 상담전공 학부생 31명을 대상으로 비대면 집단상담 매회기 경험 보고서를 수집하였다. 수집된 269개의 자료는 Elo와 Kyngäe(2008)의 귀납적 내용분석 방법을 적용하여 개방코딩, 그룹화, 추상화의 총 3단계 과정을 통해 분석하였다. 결과 분석 결과 비대면 집단상담 실습 경험은 109개의 핵심개념으로 드러났으며, 각각의 개념은 25개의 하위범주와 7개의 범주로 나타났다. 그리고 연구참여자들의 경험을 잘 제공하기 위해 7개의 범주를 다시 4개의 영역으로 분류하였다. 7개의 범주로는 ‘타인의 시선과 자기개방에 대한 두려움’, ‘자기 이해의 촉진’, ‘집단원들과의 긍정적인 정서 경험’, ‘실질적인 변화의 경험’, ‘상호작용을 통한 성장’, ‘예비상담자로서의 배움’, ‘비대면 상담 환경에 기인한 경험’으로 나타났다. 4개의 영역은 ‘집단 경험에서의 어려움’, ‘성장집단의 치료적 요인’, ‘학습 경험’, ‘비대면 상담 경험’으로 분류되었다. 결론 연구결과를 바탕으로 상담 전공 학부생들의 비대면 집단상담 실습 경험의 특징과 시사점을 논의하였다. 본 연구가 비대면 교육 현장에서 상담전공 학부생들에게 질 높은 실습 수업을 위한 다양한 시사점을 제공할 것으로 기대한다. Objectives This study explores the experiences of non-face-to-face group counseling practice for undergraduate counseling majors in COVID-19 situations, and examines the possibilities and limitations of non-face-to-face group counseling practice. Methods To this end, 31 undergraduate students who took a group counseling at a university in Gyeonggi-do collected a non-face-to-face group counseling experience report. The 269 data collected were analyzed in a total of three steps: open coding, grouping, and abstraction by applying the inductive content analysis methods of Elo and Kyngäe(2008). Results As a result of the analysis, 109 core concepts were revealed in the non-face-to-face group counseling practice experience, and each concept was divided into 25 subcategories and 7 categories. And to provide a good experience for the study participants, 7 categories were further divided into 4 areas. The seven categories are ‘fear of others’ gaze and self-opening’, ‘promotion of self-understanding’, ‘positive emotional experience with group members’, ‘experience of substantial change’, ‘growth through interaction’, ‘learning as a preliminary counselor’, and ‘experience due to non-face-to-face counseling environment’. In the four domains, ‘difficulty in group experience’, ‘therapeutic factors of growth group’, ‘learning experience’, and ‘non-face-to-face counseling experience’ were classified into four domains. Conclusions Based on the research results, implications for the experience of non-face-to-face group counseling practice of undergraduate counseling majors were discussed.

대용량 전력변환기의 파워모듈 수명 향상을 위한 제어로직 관한 연구

이진현(Jin Hyun Lee),이상혁(Sang Hyeok Lee),신덕식(Duck Shick Shin),이상택(Sang-Taek Lee) 전력전자학회 2023 전력전자학술대회 논문집 Vol.2023 No.7

지체장애인의 컴퓨터접근 향상을 위한 보조공학 평가 도구에 관한 연구

이진현(J. H. Lee),이근민(K. M. Rhee) 한국재활복지공학회 2008 한국재활복지공학회 학술대회논문집 Vol.2008 No.11

This research is about assessment tools of computer access that people with physical disabilities get to approach environment for using computer. There are 10 assessment tools that was compared various advantages to weaknesses of tool each other.

이코노마이저 시스템의 급기 온도에 따른 에너지 절감효과 분석

이진현(Lee, Jin-Hyun),김효준(Kim, Hyo-Jun),조현(Cho, Hyun),조영흠(Cho, Young-Hum) 한국건축친환경설비학회 2017 한국건축친환경설비학회 논문집 Vol.11 No.5

The economizer is one of the energy saving methods through the operation of HVAC system. When the economizer is applied, the energy is saved as compared with the case without it. Currently, it is suggested as a recommendation of the energy saving design standard of the building, which is a domestic regulation. However, In Korea, it is not applied universally compared to other countries and it is applied to some skyscrapers but it is not operated properly because it is not operated or operated passively by manager"s experience. The conventional control method of the economizer system presented the supply air temperature constantly, but it is considered that additional energy saving is possible compared with the previous control method as the supply air condition is changed according to the load condition. Therefore, in this study, we evaluated the energy saving effect by changing the supply air temperature according to the outdoor condition in the economizer dry bulb temperature and enthalpy control method of CAV and VAV systems. For this, BIN method was used and the cooling, fan, and heating energy were analyzed. Based on the results, the supply air temperature according to the outside temperature was derived. The derived supply air temperature methods and the existing economizer control methods were analysed by evaluating the energy. As a result, it was confirmed that both the dry-bulb and enthalpy economizer can save energy compared to the existing method in CAV and VAV systems.