PSA 공정의 최적화에 관한 연구

이재진 홍익대학교 2001 국내석사

Hydrometer법의 원리를 이용한 혼합 시멘트 분말도 신속품질평가 가능성 분석

이재진 청주대학교 대학원 2019 국내석사

본 연구에서는 실무에서 혼합 시멘트의 분말도 인수검사 시 품질관리 방법에 대하여 종전에 진행되었던 콘크리트 강도 조기추정의 비중계법을 이용한 원리를 혼합시멘트에 적용함으로써 분말도 신속 평가가 가능 할 수 있는지에 대하여 분석하고자 하였다. 또한, 기존의 방법으로 액체밀도계 밀도 값과 분말도의 상관관계로 1차 회귀식을 활용하는 것이 아닌 밀도 값과 혼화재 치환율을 복합한 다중상관관계를 분석하므로서 새로운 혼합 시멘트 분말도 신속 추정 방법을 제안하고자 하였는데, 그 결과를 요약하면 다음과 같다. 1) 입도의 크기가 서로 다른 FA 시멘트 및 BS 시멘트는 분말도가 작을수록(입자가 굵을 수록) 액체밀도계의 침하속도는 빨라짐을 확인할 수 있었고, 동일 시간대에서 분말도 변화에 따라 서로 다른 밀도 값을 나타내었다. 즉, 동일 시간대의 밀도 값과 분말도의 상관관계를 이용할 경우 FA 및 BS 시멘트 분말도 신속 평가가 가능할 것으로 사료된다. 2) 액체밀도계 밀도 값과 분말도의 상관관계에서 FA 시멘트의 경우 전체적인 회귀식을 확인하였을 때 서로 다른 품질의 FA(정분, 원분, Reject) 및 시멘트를 사용하므로 하나의 수렴된 상관관계는 나타나지 않아 밀도 및 혼화재 치환율을 고려한 별도의 다중 상관 회귀식이 필요한 것으로 분석되었다. BS 시멘트의 경우는 대체적으로 1분 ~ 5분의 밀도 값에서 높은 상관계수를 나타냈지만, 정밀도를 고려하였을 때 1차 회귀식이 아닌 다중상관 회귀식이 필요할 것으로 사료된다. 3) 액체밀도계 밀도 값과 FA 및 BS 치환율을 복합한 다중상관관계로 먼저 FA 시멘트의 경우 3분의 밀도 값이 가장 양호한 상관성을 나타내어 3분 밀도 값을 사용하였다. 즉, 회귀식 48642.49x1 –5.939x2 – 47234 (R2= 0.8647)을 활용할 경우 FA 시멘트 분말도를 신속 추정될 수 있는 가능성을 확인하였다. BS 시멘트의 경우 5분의 밀도 값 사용에서 R2= 0.8931으로 가장 양호한 상관성을 나타내었다. 즉, 회귀식 y = 179166x1 + 16.045x2 – 178609 (R2= 0.8931)을 활용할 경우 BS 시멘트 분말도를 신속 추정될 수 있는 가능성을 확인하였다. 이상을 종합하여 볼 때 실무에서 유통되는 혼합 시멘트를 대상으로 분말도 인수검사 시 액체밀도계의 원리를 적용하여 품질관리를 실시할 경우 혼합 시멘트 분말도 품질 신속 평가가 가능할 것으로 판단되는데, 이 경우는 기존의 분말도 측정 방법인 Blaine 공기투과장치(KS L 5106)를 이용하는 것보다 경제적이고, 간단한 방법으로 효율성이 높을 것으로 사료된다. In this study, the purpose of the study was to analyze the possibility of rapid assessment of the powder by applying the principle of hydrometer for early estimation of concrete strength to the mixed cement for quality control testing. and In the existing method, it was suggested that the new mixed cement powder would be quickly estimated by analyzing the relationship between the density value and the compound exchange rate rather than the use of the primary regression as a correlation between the hydrometer density value and powder. 1) FA cement and BS cement with varying degrees of elevation were able to see that the smaller the degree of powder, the faster the settlement rate of hydrometr was, and different density values were shown depending on the variation of the powder at the same time. In other words, FA and BS cement powder can also be quickly assessed if the density value of the same time zone is correlated. 2) The multi-relationship between the hydrometer density values and the FA and BS replacement rates combined indicates the highest correlation of the three-minute density values in the case of FA cement, using a three-minute density value. That is, if regression 48 642.49x1 – 5.939x2 – 47 234 (R2= 0.8647) was used, the possibility of rapid estimation of FA cement powder was identified. For BS cement, R2=0.8931, the best correlation with the use of a density value of 5 minutes was shown. In other words, using regression y = 179 166x1 + 16.045x2 – 178 609 (R2= 0.8931) the possibility of rapid estimation of BS cement powder was found. In this case, if quality control is carried out by applying the principle of hydrometer to mixed cement distributed in practice, it is deemed that mixing cement powder can be measured more quickly than traditional methods.

웹기반 수업에서 의지조절능력수준과 교재흥미유발전략이 학업성취도와 만족도에 미치는 효과

이재진 서울대학교 대학원 2004 국내석사

Prognosis accordiing to the extent of tumor resection after pre-operative chemotherapy in C3H/HeJ-SCC VII model

이재진 서울대학교 대학원 2006 국내박사

초등교사의 셀프리더십과 조직신뢰가 직무만족에 미치는 영향

이재진 서울교육대학교 교육전문대학원 2023 국내석사

본 연구는 초등교사의 셀프리더십과 조직신뢰가 직무만족에 미치는 영향을 확인하는데 그 목적이 있다. 이를 확인하기 위해 연구문제를 다음과 같이 설정하였다. 첫째, 초등교사의 셀프리더십, 조직신뢰, 직무만족도는 개인 교사의 특성에 따라 차이가 있는가? 둘째, 초등교사의 셀프리더십, 조직신뢰, 직무만족의 상관관계는 어떠한가? 셋째, 초등교사의 셀프리더십과 조직신뢰는 직무만족에 어떤 영향을 미치는가? 본 연구문제를 해결하기 위해 전국 초등학교에 근무하는 교사를 모집단으로 설정하여 총 253명의 교사 응답을 대상으로 t검정, One-Way ANOVA, 상관관계분석 및 다중회귀분석을 실시하였다. 이를 통해 확인한 주요 연구 결과는 다음과 같다. 첫째, 초등교사의 셀프리더십, 조직신뢰, 직무만족도는 교사 특성에 따라 차이가 있었다. 특히 남성인 경우와 보직을 맡고 있는 경우 위의 3가지 변인 모두에서 유의하게 높은 결과를 나타냈다. 또한 41학급 이상의 학교에 근무하는 교사가 조직 신뢰와 내재적 직무만족이 높았으며, 교직경력이 10년 미만인 경우 동료교사 신뢰가 유의하게 높았다. 둘째, 초등교사의 셀프리더십, 조직신뢰, 직무만족도는 서로 밀접한 상관관계를 보이고 있었다. 배경 변인별 상관관계를 살펴보면 나이와 경력, 성별과 보직 여부가 밀접한 상관관계를 가지고 있었다. 이는 남교사인 경우 부장을 할 가능성이 큰 현 교직문화가 반영된 결과로 볼 수 있으며 교사 특성에 따른 주요 변인의 차이를 분석할 때 반영해야 함을 알 수 있다. 한편 독립 변인인 셀프리더십과 조직신뢰, 종속 변인인 직무만족 모두 통계적으로 유의한 상관관계를 나타냈다. 이는 셀프리더십과 조직신뢰가 직무만족에 영향을 미칠 수 있음을 시사한다. 셋째, 초등교사의 셀프리더십과 조직신뢰 모두 직무만족에 유의한 정적 상관관계를 갖는 것을 확인할 수 있었다. 초등교사의 셀프리더십 전략의 사용 수준이 높을수록 직무만족도가 증가하였으며, 조직신뢰가 높을수록 직무만족도가 증가하는 것을 확인할 수 있었다. 구체적으로 하위요인을 분석하면 내재적 직무만족에는 자기비판 전략, 자연적 보상 전략, 조직신뢰가 모두 영향을 미쳤으며, 외재적 직무만족에는 자연적 보상 전략과 조직 신뢰가 유의한 영향을 미침을 확인할 수 있다. 본 연구의 결론을 정리하면 다음과 같다. 첫째, 일반교사들은 부장교사들과의 상호작용을 통하여 셀프리더십의 전략 사용을 기르기 위한 노하우와 방법을 전수받을 필요가 있으며, 더 나아가 구성원 간 신뢰의 중요성을 느낄 필요가 있다. 일반교사와 부장교사의 이러한 소통의 활성화를 통해 일반교사의 셀프리더십 및 학교 구성원에 대한 신뢰 향상도 기대할 수 있을 것이다. 둘째, 셀프리더십과 조직신뢰가 직무만족에 긍정적인 영향을 주는 중요한 요인이므로 교사들의 직무만족도를 높이기 위해 셀프리더십과 관련된 직무 연수나 프로그램 개발이 필요하며, 조직신뢰를 높이기 위한 교육공동체의 노력과 지원이 필요함을 시사한다. 셋째, 외재적 직무 불만족 요인을 위한 해결 방안으로 행정 업무 경감이나 근무 환경 개선 등과 같은 지원 방안뿐 아니라 교사의 셀프리더십과 조직 신뢰를 중요한 요인으로 고려할 필요가 있다. The purpose of this study is to confirm the effect of self-leadership and organizational trust of elementary school teachers on job satisfaction. To confirm this, the research question was set as follows. First, does the self-leadership, organizational trust, and job satisfaction of elementary school teachers differ depending on the characteristics of individual teachers? Second, what is the correlation between self-leadership, organizational trust, and job satisfaction of elementary school teachers? Third, how do elementary school teachers' self-leadership and organizational trust affect job satisfaction? To solve this study problem, t-test, One-Way ANOVA, correlation analysis, and multiple regression analysis were conducted on a total of 253 teacher responses by setting teachers working at elementary schools nationwide as a population. The main research results confirmed through this are as follows. First, the self-leadership, organizational trust, and job satisfaction of elementary school teachers differed according to the characteristics of teachers. In particular, in the case of men and in the case of positions, the results were significantly high in all three of the above variables. In addition, teachers working in schools with more than 41 classes had high organizational trust and intrinsic job satisfaction, and peer teacher trust was significantly higher when they had less than 10 years of teaching experience. Second, elementary school teachers' self-leadership, organizational trust, and job satisfaction showed a close correlation with each other. Looking at the correlation by background variable, there was a close correlation between age and career, gender and position status. This can be seen as a result of reflecting the current teaching culture, which is likely to be a manager in the case of male teachers, and it can be seen that differences in major variables according to teacher characteristics should be reflected when analyzing. On the other hand, self-leadership, organizational trust, and job satisfaction, which are independent variables, all showed statistically significant correlations. This suggests that self-leadership and organizational trust can affect job satisfaction. Third, it was confirmed that both self-leadership and organizational trust of elementary school teachers had a significant positive correlation with job satisfaction. It was confirmed that the higher the level of use of the self-leadership strategy of elementary school teachers, the higher the job satisfaction, and the higher the organizational trust, the higher the job satisfaction. Specifically, when analyzing sub-factors, self-criticism, natural compensation, and organizational trust all affected intrinsic job satisfaction, and natural compensation strategies and organizational trust had a significant impact on external job satisfaction. The conclusions of this study are summarized as follows. First, general teachers need to receive know-how and methods to develop the use of self-leadership strategies through interaction with department head teachers, and furthermore, they need to feel the importance of trust among members. Through the activation of such communication between general teachers and department head teachers, self-leadership of general teachers and improvement of trust in school members can also be expected. Second, since self-leadership and organizational trust are important factors that positively affect job satisfaction, it is necessary to develop job training or programs related to self-leadership to increase teachers' job satisfaction, and the educational community's efforts and support to increase organizational trust. Third, as a solution for external job dissatisfaction factors, it is necessary to consider teachers' self-leadership and organizational trust as important factors as well as support measures such as reducing administrative work or improving the working environment.

가치흐름지도(VSM) 기반의 린 6시그마를 활용한 항공산업 프로세스 혁신에 관한 연구

이재진 공주대학교 산업과학대학원 2009 국내석사

Recently, most management innovation tools have broken their boundaries. Lean 6 Sigma is one of them which combines strong points of Lean and 6 Sigma. The powerful effect of the tool has been proven by the successful cases of Lockeed Martin and Boeing aircraft company. There are some case studies of Lean 6 Sigma practiced in foreign countries, on productivity and quality innovation, but it is difficult to find application and assessment on Korean aircraft industry. For that reason, the purpose of this study is to verify that the tool fit to improve the productivity and quality on the aircraft industry process, and then to offer application method according to precedent. This study begins from the investigation of Lean 6 Sigma theory. The first chapter, 6 Sigma and Lean 6 Sigma consist of outline, requisite and application. But the second section, Lean principle, is had the constitution added the method of drawing a Value Stream Map which all Lean improvement projects are based on. The value stream of the aircraft industry flows through designing, development, assembling, selling, operation and depot. Chapter Ⅲ consists of a case study of 82nd Aircraft Maintenance Depot located at the end stream of the aircraft industry. In the last chapter, fourth, it finishes this study with summary, conclusion and proposal.

반복 스프린트 훈련과 스피드 지구력 훈련이 대학 축구선수의 체력 및 경기 퍼포먼스에 미치는 영향

이재진 인천대학교 대학원 2023 국내석사

본 연구는 U리그 기간 중 실시하는 6주간의 반복 스프린트 훈련과 스피드 지구력 훈련이 대학 축구선수의 체력 및 경기 퍼포먼스에 미치는 영향을 비교, 분석하는 것을 목적으로 하였다. 16명의 대학 축구선수들이 연구에 참여하였으며, 개입 훈련 전 연속된 3경기의 U리그 출전 시간을 기준(15분 미만, 30-60분, 60분 이상)으로 반복 스프린트 훈련(Repeated Sprint Training, RST) 그룹과 스피드 지구력 훈련(Speed Endurance Training, SET) 그룹으로 무선 배정하였다. 각 그룹에 배정된 선수들을 대상으로 같은 이동거리(세트당 160m)로 구성된 RST 훈련과 SET 훈련을 주 2회씩 6주간 실시하였으며, 개입 전과 후 축구 관련 체력 테스트를 실시하였으며, 동시에 개입 직전 및 직후 연속된 3경기를 대상으로 경기 퍼포먼스를 분석하였다. 연구 결과, SET 그룹에서 유・무산소성 운동 수행능력의 향상과 더불어 무산소성 운동 수행능력을 나타내는 40m 스프린트 중 20m 통과 기록 및 윙게이트 테스트의 최대 및 평균 파워의 개선이 나타났다. 반면 훈련 전후의 경기 퍼포먼스의 변화를 분석한 결과에 따르면, 훈련 그룹에 관계없이 분당 총 뛴 거리 및 최대 속도에 변화는 없었다. 경기력과 밀접한 연관이 있다고 알려진 분당 고강도로 달린 거리가 RST 그룹에서는 변화가 없었지만, SET 그룹에서 유의하게 감소한 것으로 나타났다. 따라서, 본 연구의 결과는 대학 축구선수들을 대상으로 시즌 중 실시된 6주간의 고강도 간헐 훈련 프로그램(RST, SET)이 시즌 중 나타날 수 있는 축구선수의 유・ 무산소성 체력 저하를 예방하고, 경기력 향상을 도모할 수 있는 훈련으로 적용 가능함을 시사한다. The purpose of this study was to examine the effects of six weeks of repeated sprint training (RST) or speed endurance training (SET) on the physical fitness and match performance of university soccer players during a season. Sixteen soccer players participated in the study and were divided into three groups based on their average playing time (less than 15 minutes, 30-60 minutes, and 60 minutes or more) as determined during three consecutive university-league matches before the study. Next, we randomly assigned players from each of the groups to either the RST condition or the SET condition, ensuring that all three playing-time categories were equally represented in the training conditions. For training sessions, one set of RST consisted of participants sprinting all out for 40 m and recovering for 20 sec. One set of SET consisted of participants running 160 m and resting for 2 min. Training sessions were conducted twice a week for six weeks. The number of sets were gradually increased from 4 to 6 sets per session over the course of the six-week program. Soccer-related physical fitness field tests, including the Yo-Yo intermittent recovery test Level 2 (YYIRT-L2), the repeated sprinting ability test, and the Wingate test, were administered and match-performance analyses for three consecutive games were performed before and after the training program. Studies have shown that both types of training significantly improve indices of soccer-specific aerobic capacity both on the YYIRT-L2. As for anaerobic capacity, faster 20-m speed results were produced by SET participants during the 40-m sprint test and SET participants exhibited significant improvements in peak and average power during the Wingate test. In addition, there was no reduction in total distance per minute for maximum velocity regardless of the training group. However, although overall distance per minute with high-intensity running remained unchanged in the RST group, it was significantly decreased in the SET group. Taken together, the current results suggest that a six-week high-intensity intermittent training program (RST, SET) conducted during the season for university soccer players can be applied not only to prevent mid-season decreases of soccer-related physical fitness, but also to improve match performance.

高等學校 共通社會(韓國地理) 敎科書 分析

李在辰 東國大學校 敎育大學院 1998 국내석사

Development of a Drift-Flux Model Based Pinwise Whole Core Thermal-Hydraulics Analysis Code Aiming at Highly Parallelized Execution

이재진 서울대학교 대학원 2016 국내석사

In order to improve the parallel computation efficiency of neutronics/thermal-hydraulics (T/H) coupled reactor core calculations, a core T/H analysis code ESCOT, that can handle pinwise flow channels in the whole core calculation, is developed based on the drift-flux model and a SIMPLE-like numerical solution scheme. The governing equations are formulated and discretized from a three-dimensional 4-equation model to derive the pressure equation coupled with the equations of scalar variables. The initial verification and validation are performed for single-phase flow conditions to assure the accuracy of the code. The calculated results are comparing with the analytic solutions, experiments, and the results of other codes such as CUPID, CTF and MATRA. The selected problems deal with the following phenomena: pressure drop by gravity acceleration and spacer grids, turbulent mixing, crossflow by friction-flow-split and asymmetric flow inlet, reverse flow by recirculation, and simplified main steam line break (MSLB) accident. It turns out that ESCOT is about 3 times faster than CTF while retaining comparable accuracy. In order to establish an effective linear solver for the pressure equation on parallel computing platforms, the efficiency of various linear solvers is examined. The selected linear solvers are a direct solver, SuperLU, and two Krylov subspace algorithms, GMRES and BiCGSTAB. The BILU3D preconditioner is applied to accelerate the Krylov subspace algorithms, and the Krylov subspace calculation modules are parallelized with OpenMP. The incomplete domain decomposition is applied to forward and backward substitutions to solve the preconditioner equation in parallel. Parallel performance tests are carried out with sample problems, and it is shown that the unpreconditioned BiCGSTAB yields the best performance in terms of computing time and speedup.

뇌졸중 발생 후 급성기 뇌졸중환자들의 초기 반응과 뇌졸중 지식이 병원 도착 전 시간 지연에 주는 영향

이재진 조선대학교 대학원 2009 국내석사

Backgrounds : Majority of stroke patients are still unable to receive thrombolytic therapy because they do no not reach a hospital within 3 hours from onset. The aims of this study were to know factors including knowledge of stroke which could affect pre-hospital time and the association between first actions of patients after stroke onset and pre-hospital time. Methods : From May 2007 to December 2007, consecutive ischemic stroke patients presented within 3 days from onset and their relatives were interviewed about knowledge of stroke (stroke warning sign, thrombolytic therapy, the three-hour time limit, and use of emergency medical service)and first actions (self-treated, wait and see, seek advice, seek medical advice) at stroke onset. Clinical data of patients were collected from medical records. Results : One hundred fifty three patients were included finally. Thirty seven patients (24.2%) were reached to our hospital within 3 hours from symptom onset. In univariate and multivariate analysis, factors independently associated with presentation within 3 hours were age (odds ratio [OR]0.95, 95% confidence interval [CI] 0.91-0.99, p=0.008), atrial fibrillation (OR 5.02 CI 1.35-18.70, p=0.016), NIHSS at admission (OR 1.09, CI 1.01-1.18, p=0.028), and to know ‘the three-hour time limit’ (OR 3.55, CI 1.45-8.72, p=0.006). In the patients with NIHSS >4 points, to know ‘the three-hour time limit’was only an independent factor associated with presentation within 3 hours. This knowledge was significantly associated with background with completed high school (p=0.038). Patients who sought medical advice were more early arrived to the hospital. The main factors related with seek medical advice were NIHSS (OR 1.13, CI 1.048-1.213, p=0.001) and atrial fibrillation (OR 3.01 CI 1.009-8.948, p=0.048). Conclusions : Knowledge of ‘the three-hour time limit’ was only a modifiable factor which was able to influence on arrival within 3 hours. Initial actions of patients including call emergency medical service affect the pre-hospital time. The public education about stroke knowledge about ‘the three-hour time limit’ and ‘call emergency medical service’ may give a more chance of thrombolysis to acute stroke patients. Key words : Stroke, Thrombolysis, Emergency medical services, Education