양측 내경동맥 무형성증: 증례 보고

이승로,박동우,함창곡,Lee, Seung-Ro,Park, Dong-U,Ham, Chang-Gok 대한영상의학회 2004 대한영상의학회지 Vol.50 No.1

일측성 혹은 양측성 내경동맥 무형성증은 드문 선천성 이상이며,특히 양측성인 경우는 매우드물다.저자들이 경험한 양측성 내경동맥 무형성증 1예를 자기공명영상과 자기공명혈관조영술 소견과 함께 보고하고자 한다. Unilateral or, particularly, bilateral congenital agenesis of the internal carotid artery is a rare anomaly. We report an occurrence of the condition, arising bilaterally, and report the findings of magnetic resonance imaging and magnetic resonance angiography.

$CO_2$ 첨가가 $CH_4$-공기 대향류 확산화염의 구조 및 NOx 생성에 미치는 영향

이승로,한지웅,이창언,Lee, S.R.,Han, J.W.,Lee, C.E. 한국연소학회 1999 한국연소학회지 Vol.4 No.2

This numerical study was to investigate the effect of $CO_2$ addition on the structures and NOx formation characteristics in $CH_4$ counterflow diffusion flame. The importance of radiation effect was identified and $CO_2$ addition effect was investigated in terms of thermal and chemical reaction effect. Also the causes of NOx reduction were clarified by separation method of each formation mechanisms. The results were as follows : The radiation effect was intensified by $CO_2$ addition. Thermal effect mainly contributed to the changes in flame structure and the amount of NO formation but the chemical reaction effect also cannot be neglected. The reduction of thermal NO was dominant with respect to reduction rate, but that of prompt NO was dominant with respect to total amount.

니켈-크롬 합금과 Porcelain laminate의 결합력에 관한 연구

이승로,진태호,동진근,Lee Seung-Lo,Jin Tai-Ho,Dong Jin-Keun 대한치과보철학회 1992 대한치과보철학회지 Vol.30 No.1

The purpose of this study was to evaluate the bonding strength between porcelain laminate and Ni-Cr alloy in the various surface treatments of the bonding faces. For this study the metal surface of specimens were treated : 1) etching only, 2) sandblasting only, and 3) sandblasting and etching. The porcelain laminate were made and bonded to the metal specimens with light curing composite resin cement. Instron testing machine was used to measure their bonding strength : and the result was obtained as follows : 1. The bonding strength of the double treatment of the sandblasting and etching group was higher than that of the single treatment of sandblasting or the etching group. 2. The bonding strength of the sand blasting group was higher than that of the etching group. 3. The debonding were mainly occurred between the Ni-Cr alloy and the composite resin cement.

자발성 흉부 척수 탈출증:1예보고

이승로,박동우,주경빈,Lee, Seung-Ro,Park, Dong-U,Ju, Gyeong-Bin 대한영상의학회 2001 대한영상의학회지 Vol.45 No.4

자발성 흉부 척수 탈출증은 척수가 손상이나 수술적 조작의 기왕력이 없는 경막을 통해 탈출 되는 드문 질환이다.이 질환은 척수병증을 유발하는 질환 중에서 치료가 가능한 경우이나 잘 알려져 있지 않은 질환이므로 적절한 진단이 늦어지는 경우가 많다.저자들은 CT와 MR소견상 흉부 척수가 경막 결손을 통해 전측방으로 탈출되어 있었던 자발적 흉부 척수 탈출증의 증례를 경험하여 보고한다. Spontaneous herniation of the spinal cord is a rare disease entity in which spinal cord substance is herniated through a previously uninjured and/or untouched dura. It is a cause of myelopathy that is treatable but difficult to diagnose. We report the CT and MR findings of a case of spontaneous thoracic spinal cord herniation manifesting as ventrolateral protrusion of thoracic spinal cord through a dural defect.

고효율 친환경 응축형 열교환기 개발

이재박(Jaepark Lee),이승로(Seungro Lee),이창언(Chang-Eon Lee),윤희중(Hee-Jung Yun),이황의(Hwang-Eui Lee),장기현(Gi-Hyun Jang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40

This study was about the development of green high-efficiency condensing heat exchanger which does not need a technical importation from foreign country and is able to produce it by own technology. The efficiency of BAND A, SEBBUK was set more than 90 %, and CO and NOx emissions were targeted less than 50 ppm and 40 ppm, respectively. The pilot unit was made using a heat exchanger Benchmarking of developed countries, and the shape and the position of tube were adjusted to reduce CO and NOx emissions at the same time.

FEM-LSTM 기반의 고압 다이캐스팅 공정 관리방안

이승로(S. R. Lee),이승철(S. C. Lee),김경민(K. M. Kim),김낙수(N. S. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월

본 연구는 고압 다이캐스팅 공정에서 결함을 사전에 판단하기 위한 공정 관리방안에 관한 연구이다. 고압 다이캐스팅 공정은 금형 안에 높은 온도에서 소재를 고속, 고압으로 주입하는 주조 방법으로 알루미늄을 활용한 자동차 부품 생산 등에 주로 활용된다. 그러나, 고압 다이캐스팅 공정에서는 게재물, 가스에 의해 수축 결함 등의 문제가 발생한다. 결함이 발생하는 경우, 공정의 특성상 제품을 추출하고 나서 확인해야 하는 문제점이 있으므로 사전에 결함 방지를 위한 공정 조건을 변경하기 힘들다. 따라서, 본 논문에서는 유한요소해석(FEM)을 통해 다양한 상황을 가상으로 시뮬레이션하고, 결과에서 나타난 결함을 장단기 메모리 LSTM) 모델을 통해 사전에 예측할 수 있는 알고리즘을 개발하였다. 알고리즘 적용을 위해 Plate 형태의 간단한 주조 제품과 주조 방안, 금형을 설계하였으며 상용 Software 인 AnyCasting v6.7 을 활용하여 ALDC12 소재에 대한 고압 다이캐스팅 해석을 구현하였다. 주조 해석에서 가장 온도가 크게 변하는 지점에 센서를 설정하여 사이클 공정 해석을 진행하며 사이클에 따른 온도를 확인하였다. 설정된 사이클 해석 완료 후, 냉각 시스템 불량 상태를 가정하기 위해 냉각 채널을 Off 하여 추가 해석을 진행하였다. 수축 결함 발생을 3 Cycle 전에 예측하고자 LSTM 모델을 구현하였다. 센서를 하나만 활용했을 때와 2 개를 활용했을 때 LSTM 모델은 각각 91.7, 94.4%의 사전 예측 정확도를 보였다. 해당 연구는 실제 공정에서 설정 공정 조건 등에 따른 결함 사전 예측으로도 활용될 수 있다.

H₂O-CH₄/Air 대향류 비예혼합화염의 연소 거동에 관한 수치해석 연구

이승로(Seungro Lee),권오채(Oh Chae Kwon) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5

마비말장애 환자의 공기역학적 임상 감별 비교

이승로(Seung-Rho Lee) 한국의료정보교육협회 2017 보건의료생명과학논문지 Vol.5 No.2

본 연구의 목적은 마비말장애 말소리 명료도를 객관적인 척도로 변별하기 위한 음향학적, 기류적 파라미터를 확인하는 동시에 마비말장애의 명료도에 영향을 줄 수 있는 강도와 기류율 그리고 성대진동과 성문기류사이 관계 파라미터를 분석하여 후두, 성문 그리고 성문하압을 음향학적 에너지로 변환시키는 후두의 능력 척도인 발성효율성(vocal efficiency)을 알아보고자 하였다. 연구결과 마비말장애는 강도와 기압에는 차이가 있고 기류는 차이가 발생되지 않았다는 것은 강도의 증가로 기류율은 향상되었지만 아직 후두내근의 약증으로 발성의 효율성 측면에서는 문제점을 내포하고 있었다. The purpose of this study is to analyze acoustic and airflow parameters to identify the acoustical and current parameters of dysarthrias, and the ability to influence the voice of the larynx, the gate and the gate of the vocal cord to the sound of the vocal cord, and the ability to analyze the parameters of the larynx and gate respectively, to determine the sound efficiency of the larynx, the voice of the larynx and the gate. Although the failure of the word paralysis was different from the intensity and atmospheric pressure of the horse, the increase in air flow was improved due to the increase in the intensity of the activity, but the complications of the speech were still present in terms of the effectiveness of the speech.

상업스포츠센터 스포츠소비자의 라이프스타일 성향분석

이승로(Lee Seung Lo),육종술(Yug Jong Sul) 한국사회체육학회 2003 한국사회체육학회지 Vol.20 No.1

The purpose of this study is to present basic data for market segment as to analyze sport consumer of commercial sport center in Seoul city. The data base comprised 528(325 man, 203 woman). In order to examine various factors of sport consumer`s tendency, the questionnaires which was composed of lifestyle as psycho-graphics was used as a measurement device. For lifestyle, the questionnaire by Youk and Jung(1995) was used on the basis of previous studies by Plumer(1975). The questionnaire consisted of 39 items to reflect lifestyle, and 4 items demographic variables like sex, age, education degree and job pattern . The subjects were requested to indicate the extent of their agreement with each item on a 5-point Likert scale ranging from 1(definitely false) to 5(definitely true).In some instance, however, the respondents did not complete all the items in the questionnaire. Consequently, the degree of freedom varied from analysis to analysis due to missing data. The internal consistency estimates(Cronbach’s alpha) were range from .49 to .81 and .69 for entire scale of lifestyle In order to statistical analysis, this study used a SPSS version 7.0 program for windows. Statistical treatment were ANOVA, Duncan range test. The result of this study, which were attained through the process, are as follows. First, there were significant difference fashion, will, self-confidence, and brand in life style by sex. Second, Achievement and brand in life style were influenced by education degree. Third, Weak, vanity, brand and health in life style were influenced by age. Forth, Fashion, will, weak and brand in life style were influenced by job pattern.

[디젤엔진부문] CO₂가 CH₄/Air 대향류 확산 화염의 구조 및 Nox 생성 특성에 미치는 영향

이승로(Seung Ro Lee),한지웅(Ji Woong Han),이창언(Chang Eon Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1

This study is to investigate the effect of CO₂ addition on the structure and NOx formation characteristics in CH₄ counterflow diffusion flame. The effect of CO₂ addition is examined as thennodynamic and chemical reaction effect respectively by introducing the imaginary nonreactive molecule X, whose characteristics is the same as CO₂ except reactiveness. The results show that. In changing flame temperature, the strain rate effect is dominant at high strain rate, but radiation heat loss effect is dominant at low strain rate. This effect are intensified when CO₂ is added. This change is attributed mainly to thermodynamic effect. But partly to chemical reaction effect, which is caused by CO₂ intervention of oxidation. As a result of chemical reaction effect, production rate of CH is reduced and so the N, HCN, which are the sources of prompt NOx, and thus NOx concentration is decreased. But NOx reduction is mainly due to thermodynamic effect of CO₂