7FA G/T 코팅층 크랙 평가를 위한 IR카메라 활용

김재열,심재기,최철준,송경석 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

In this investigation, we evaluated diagnoses of a defect concerning coating of land-base gas turbine using infrared thermography camera. In this camera method has a strong point which is able to save time and costs compared with former method. Because it can be long field acquire temperature distribution by using non-contact method. But it has a week point that method applies thermal load about inspection sample. Presently, Method used widely in detection of crack is ultrasonic inspection. But this method, There is problem in application in place that uneven surface. In order to check cracks on a blade coating of a gas turbine, a part with cracks in a waste blade disposed after having been used in the field was extracted to produce a sample. So we apply the method by a infrared thermography camerato the produced sample, the sample was heated by means of a halogen lamp. In this paper, we want to describe production of land-base turbine sample, a method of applying thermal load at produced sample, infrared thermography camera technique, an analysis technique of thermography, a defect analysis of coating of land-base gas turbine blades.

솔라셀 효율 분석을 위한 IR카메라 활용

김재열,최철준,송경석,최승현 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

After Industrial Revolution, energy has been recognized as an important factor which enhances the motive power for industry in the industrial society. However, recently the excessive consumption of energy pursuant to the rapid expansion of industry created serious problems of the exhaustion of fossil fuels as well as unusual change in the weather due to the mass discharge of carbon dioxide. We can say that after all these proposal will boil down to the development of New & Renewable energy. The most suitable source of energy for this required change is solar energy. The advantages of solar energy are that it is renewable, infinite supplied and environmentally safe energysource, and the method of energy supply is in small scale and is decentralized. However, solar energy related products have the problems such as the limitation for installation, problems in maintenance and insufficient reliability, which have been the barrier to consumers to satisfy the purchase need for solar heat related products. In this research will perform thermodynamic analysis through the application of infrared ray thermal imaging camera and will discuss about the applicability of solar energy system and other fields as well.

손상된 주축 내경 연마를 위한 연삭기 개발에 관한 연구

김재열,정연오,김병호 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Use high definition abrader and practicing is practicing method after disjoint main shaft disjointing headstock of machine tool to grind now main sha ft of machine tool but this method has several controversial points. This research does not disjoint damaged main shaft of machine tool to solvs these problem, and develop spindle exclusive use grinder that can grind main shaft damaged directly attaching exclusive use grinder to bed of machine tool on the spot.

그람양성구균에 대한 Teicoplanin과 Vancomycin의 시험관내 항균력

최태열,김경숙,전용관,서일혜,김정욱,이웅수,안정열,김홍석,정재용,최효선,김덕언,유진우 대한감염학회 1994 감염 Vol.26 No.1

An increasing frequency of methicillin resistant S. aureus(MRSA), methicillin resistant coagulase negative staphylococci(MRCNS) and Enterococcal infection have been observed in recent years. Teicoplanin is a new glycopeptide antibiotic obstained from the Actinoplanes teicomycetius. The molecular structure and spectrum of antimicrobial activity of teicoplanin is simillar to those of vancomycin, and has been reported to have an excellent in vitro and in vivo effect against various gram-positive infections. Therefore, we evaluated the in vitor susceptibility of gram positive cocci, such as, S. aureus, coagulase negative Staphylococci(CNS), and Enterococci to teicoplanin and vancomycin. The total 253 strains consisted of MSSA(40), MRSA(53), MSCNS(47), MRCNS(48), and Enterococci(65). They were assayed by disc diffusion and agar dilution. During the study, 57% of S. aureus and 49% of CNS showed resistance to methicillin. The inhibitory diameter of teicoplanin was 15-20mm in MSSA, 12-19mm in MRSA, 13-24mm in MSCNS, 11-23mm in MRCNS, and 15-22mm in Enterococci respectively, and showed sensitivity in all but 8 strains(3.2%). The range of the minimum inhibitory concentration (MIC) of teicoplanin to MSSA, MRSA, MSCNS, MRCNS and Enterococci were 9.12-2.0㎍/ml, 0.25-2.0㎍/ml, & 0.25-32㎍/ml, 0.12-1.0㎍/ml respectively. One case of S. haemolyticus was resistant to teicoplanin (32㎍/ml) by the agar dilution method. Eight minor (3.2%) and one major(0.4%) error was observed when the MIC and disk diffusion data were correlated with teicoplanin. As for vancomycin the inhibitory diameter was 17-21mm in MSSA, 15-21mm in MRSA, 18-26mm in MSCNS, 18-25mm in MRCNS, and 16-22mm in Enterococci respectively. The range of the MIC of vancomycin to MSSA, MRSA, MSCNS, MRCNS, and Enterococci were 0.25-1.0㎍/ml, 0.25-4.0㎍/ml, 0.5-2.0㎍/ml and 0.5-2.0㎍/ml respectively. One minor error (0.4%) was seen with the vancomycin disk. The MIC90 of MSSA and MRSA exhibited the same results in teicoplanin (1.0㎍/ml, 1.0㎍/ml), and vancomycin(2.0㎍/ml, 2.0㎍/ml). MSCNS and MRCNS exhibited greater MIC90 with teicoplanin(4.0㎍/ml, 8.0㎍/ml) than vancomycin(2.0㎍/ml, 2.0㎍/ml). Incontrase Enterococci were more susceptible to teicoplanin(0.5㎍/ml) than to vancomucin (2.0㎍/ml). Results from this analysis indicated that both teicoplanin and vancomycin were very excellent for gram positive infections, especially those resistant to methicillin.

AWS ER70S-6, 1.2mm 솔리드 와이어를 사용하는 가스금속아크용접(Gas Metal Arc Welding)에서 작업자의 용접흄 및 금속 폭로에 영향을 주는 요인

정재열,김정만,김용규 동아대학교 부설 산업의학연구소 1997 산업의학연구소 논총 Vol.- No.3

CO₂용접을 대상으로 용접자세, 용접전류 및 헬멧에서 아크까지의 거리 등에 따라서 작업장에서 발생하는 용접흄과 금속에 대한 폭로농도를 파악하여 폭로에 영향을 줄 수 있는 요인을 밝히고자 본 연구를 수행하였다. 중장비 제조업체에서 직경 1.2mm 솔리드 와이어(AWS ER70S-6, BS A18, JIS YGW12)만을 이용하여 CO₂용접을 하는 작업자 95명(전자세 작업자 34명, 아래보기와 수평자세 30명, 위보기와 수직자세 31명)을 대상으로 수행하였다. 연구결과를 요약하면 다음과 같다. 1. 아래보기와 수평자세에서 용접흄의 폭로농도는 15.83mg/㎥으로 가장 높았고, 용접전류도 257.83암페어로 가장 높았으며 헬멧에서 아크까지의 거리 또한 44.87cm으로 가장 멀었다. 2. 철, 망간, 구리, 아연의 금속 폭로농도는 아래보기와 수평자세에서 각각 5.254mg/㎥, 0.849mg/㎥, 0.072mg/㎥, 0.048mg/㎥으로 가장 높았다. 용접흄의 폭로농도가 높을 수록 용접 와이어 그리고 일부 금속은 모재에 함유되어있는 성분이 금속 폭로에 영향을 주었다. 3. 전자세에서 용접흄의 폭로농도와 용접전류사이의 상관관계가 r=0.93으로 가장 높았고, 아래보기와 수평자세에서 용접흄 폭로농도와 헬멧에서 아크까지의 거리사이의 상관관계가 r=0.39으로 가장 높았다. 용접자세에 따른 용접흄 폭로농도에 있어 헬멧에서 아크까지의 거리보다는 용접시 이용되는 용접전류가 더 큰 영향을 주었다. 4. 아래보기와 수평자세에서 공히 용접흄의 폭로 농도가 높을 수록 용접 와이어의 성분인 철, 망간, 구리, 아연의 폭로농가 높은 경향을 보였다. 5. 용접자세에 따른 금속의 복합영향에 있어서 용접자세에 따라 다소 차이가 있었으나 용접 와이어에 함유되어있는 주성분인 철, 망간, 구리가 복합영향에 대한 기여도가 큰 경향이 있었다. 6. 3 개군 모두에서 용접흄의 폭로농도가 높을 수록 복합영향도 높은 경향이 있는 것으로 나타났다. CO₂welders(n=95) using AWS ER70S-6, 1.2mm diameter solid wire were examined and 95 CO₂welders were consisted of 34 all position, 30 downward & horizontal, and 31 overhead & vertical welders. To measure personal exposure for welding fumes and metals, full-period consecutive sampling was used. The results were as follows : 1. Welding fume exposure of 15.83 ㎎/㎥ , welding currents of 257.83 ampere and helmet-to arc distance of 44.87㎝ in downward & horizontal position was the highest and the longest of the three welding positions. 2. Metal exposures of iron, manganese, copper, zinc in downward & horizontal positions were the highest of the three welding positions and the concentrations were 5.254 ㎎/㎥, 0.849 ㎎/㎥, 0.072 ㎎/㎥, 0.048 ㎎/㎥, respectively. 3. Correlation coefficient of 0.93 between welding fume exposures and welding currents in all position was the highest of the three welding positions and correlation coefficient of 0.39 between welding fume exposures and helmet-to arc distances in downward & horizontal positions was the highest of the three welding positions. According to welding fume exposures by welding positions, welding currents had more effect than helmet-to arc distances. 4. Increasing welding fume exposures in downward & horizontal positions, metal components of iron, manganese, copper in welding wire and especially, zinc of base metal were observed. 5. Combined effects of metals by welding positions were some differences but iron, manganese, copper of welding wire major components were the trend that contributes to combined effects(CE). 6. Increasing welding fume exposures in 3 welding positions, combined effects were also high.

구조물의 비접촉 비파괴 검사를 위한 레이저 초음파법 적용

김재열,송경석,양동조,김유홍 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

The defects evaluation of the interior and the surface would be considered as vital characteristics in predicting the total life span of the steel structure. More importantly, the understandings in the interior composite of welding zone and the notifications in the presence, the formation, and the positioning of the non-metallic inclusion are necessary as well, since there were signs of relatively high defect frequency presented in the welding zone. The ultrasonic testing is a highly recommended technique chosen from among other techniques because of variety of advantages in conducting the non-destructive testing for the welding zone. However, the ultrasonic testing had technical disadvantages referred as followings; the problems due to the couplant between the PZT and the specimen, the formations that were miniature and complex, the moving subject, and the high temperature surrounding the specimen. This research was conducted to resolve the technical disadvantages of the contact ultrasonic testing by studying the non-contact ultrasonic testing where the ultrasonic waves were transferred by the laser, and revealing the specimen defects at its interior part and its surface part. The ultimate goal of this research was to develop a non-destructive evaluation applying the laser manipulated ultrasonic method for the steel structure

확률신경망을 이용한 반도체 패키지의 결함검출 알고리즘 개발

김재열,송경석 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

Measuring defects on the inside and on the surface of a steel structure are very important technology in order to predict the life span of the structure. In particular, a place with a high probability that it may contain defects are a welded part and it is very important to check defects in the part. absence/presence of non-uniform substances, its shpae , and the location. Many non-destructive tests can be applied, but the ultrasonic flow detection test is widely used with some advantages. However, The ultrasonic flow detection test cannot be appplied when there is a problem by a contact medium between PZT and a specimen, in case of a small and complicated shape or a moving object or when the specimen is hot. In this study, to solve the problems of the contact ultrasonic flow detection test, the non-contact ultrasonic flow detection test for sending/receiving ultrasonic waves using lasers was described. I intended to develop a non-destructive detection system applying the laser application ultrasonic test to a steel sutrcutre by detecting the defects inside of and on the surface of the specimen.

國民學校 兒童의 또래集團에서의 人氣度와 自我槪念 및 社會成熟度間의 關係

이항재,성열호 순천향대학교 1993 논문집 Vol.16 No.3

The study is to investigate the relationship of popularity in group, self-concept, and social maturity of 6th graders. The problems to investigate were as follow. 1. The relationship of popularity and self-concept of popular, rejected and isolated groups. 2. The relationship of popularity and social maturity of popular, rejected and isolated groups. 3. The relationship of self-concept and social maturity. The subjects were 114 6th graders selected as popular, rejected or isolated children by popularity test. The instruments were Test of Popularity, developed by Mihee Shin based on Moreno's Test, Shiffler's Test of Self-concept, and Social Maturity Test developed by Seung-kuk Kim and Ok-ki Kim. The data were analyzed by One-way ANOVA and Tukey Test. The results were as follow. 1. There was positive relationship between popularity and self-concept. The popular group had higher positive self-concept than the rejected or isolated groups. There were also significant difference between the rejected and isolated groups. 2. The popular group had significantly higher social maturity than the rejected group. 3. There was no statistically significant difference between the social maturity of popular and isolated groups. There was also no significant difference between the social maturity of the rejected and isolated groups. 4. There was significant relationship between self-concept and social maturity.

초음파 결함신호 영상화를 이용한 레이저 용접부 비파괴 평가

김재열,송경석,한재호,김훈조 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

This paper aims to study that the defect exploration method to specimen's thickness, using an characteristic of an ultrasonic wave generating in ablation area and thermo elasticity area, has been applied to using a way of receiving it by Air-Coupled Transducer and transmitting it by an ultrasonic wave and a way of noncontact receiving and transmitting ultrasonic wave using a laser. The longitudinal, transverse waves have been used in 60mm thickness specimen and Lamb wave in 3mm to run artificial defect detection test. In this way, the usefulness of noncontact laser ultrasonic wave has been verified. To confirm the possibility of implementation on natural defect existing at real welding part, thickness in 3mm SM45C and STS304 artificial defect specimen has been made and defect detection test using Lamb wave has been executed. Detected signal by signal treatment has been expressed in visual not RF signal. By doing so the convenience of defect detection has been attempted and the effectiveness of defect signal visualization using Lamb wave has been confirmed compare with defect image through SAT.

실전배치된 중환자용 구급차의 운영초기 문제점과 대책 : 김천소방서 중심으로

백열선 ; 이재욱 김천대학교 2011 김천대학교 논문집 Vol.32 No.-

The new ambulance for critical patient system that was introduced, in order to increase the recovery of the critical patient, shows a leap in “Pre-hospital Emergency Medical Service System". In 2007, the National Emergency Management Agency put the advancement in medical care into action and actualized the critical patient system', there-fore leading to introduce foreign ambulances. The first placing of this was in 2009 at Seoul where there were 139 ambulances, 12 in Gyeongsangbuk-do, and is being utilized in emergency situations. Despite the great impact, in reality there are several problems in management that needs to be improved. In current research, the problems in management of this system must be confronted with an effective improvement method, therefore, pub-licizing the emergency medical treatment system with effect. Through this, I wish to establish this concrete measure of medical treatment.