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이강명(Kang-Myung Lee),이일화(Il-Wha Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This paper reviewed wave propagation of train vibration based on the study of high speed railway soft ground section with pile slab construction. In a filed of railway concrete track has been adapted in a railway construction. And in order to maintain its track soil improving method was required to control residual settlement. Within many soft ground settlement prevention techniques pile slab method has an effect of minimizing residual settlement of soft ground. This is possible using support embankment load method by construct pile slab or cap the upper soft ground. This paper reviewed vibration wave characteristic of soft ground section with pile slab using numerical analysis application through finite element analysis. Pile slab method is established between high stiffened soft ground and embankment this creates a possibility of vibration block or slab amplification. Thus analyzed of wave propagation was done with roadbed and structure property to confirm application performance of pile slab method of high speed railway structure.
이강명(Kang Meang Lee),이재원(Jae Won Lee) 대한공업교육학회 1991 대한공업교육학회지 Vol.16 No.1
The purpose of the study was to develop the industrial technology teacher education program which has some flexibility to adapt to every revision of national standard curriculum. This study was conducted mainly with literature review and interview with professonal personnel. The teacher education model in general developed consists of general studies and speciality studies. In speciality studies, there are four subdivided areas. They are general pedagogy, subject content, special pedagogy related to subject area and student teaching practice. The credits allocated for each area in the model are: 45 credits for general studies, 105 credits for speciality studies(12 credits for general pedagogy, 79 credits for subject content, 12 credits for special pedagogy and 2 credits for student teaching practice), The total credits required for the model developed are 150 credits. Based upon the above teacher educatiuon model general, industrial technology teacher education model is developed. As the required subject content area, manufacturing, construction, transportation, communication and biotechnology are identified as the structural elements of technology. The special pedagogy for industrial technology education emphases the seminar to discuss the tasks and problems related to the curriculum, teaching method, instructional materials.
이강명(Kang-Myung Lee),이일화(Il-Wha Lee) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
Recently in the field of railway construction as the introduction of concrete track for maintenance of soil improvement methods that can be residual settlement is required. Pile-slab method is one of residual settlement prevention measures of soft soil, pile at the top of the slab construction is a complex structure, slab is act to distribute of the upper embankment load and piles are supported transferred load from slab of the upper slab. Soft ground intend for pile-slab method were investigated applied to actual load of high speed train and impact load according to change of embankment height and natural ground depth for time domain and frequency domain of ground propagation characteristics. 최근 철도건설분야에 콘크리트궤도를 도입함에 잔류침하량을 억지할 수 있는 지반개량 공법이 요구되고 있다. 파일슬래브 공법은 연약지반상에서의 침하방지대책 중 하나로서 지반에 설치된 파일에 슬래브를 시공하는 복합구조체로, 슬래브는 상부의 성토하중을 분산시키는 역할을 하고, 파일은 슬래브로부터 전달된 하중을 지지하여, 연약지반의 잔류침하량을 감소시키는 공법이다. 본 논문에서는 고속철도 연약지반에 적용된 파일슬래브 구간을 대상으로 하중조건별 진동의 전파특성을 검토하였다. 파일슬래브공법이 적용된 연약지반구간을 대상으로 실제 고속열차의 실측하중과 이상화한 충격하중을 적용하여 성토층의 두께와 원지반층의 두께변화에 따른 노반의 시간영역 및 주파수영역의 전파특성을 검토하였다.
이강명(Kang-Myung Lee),이일화(Il-Wha Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
구조물 접속부 구간은 궤도구조의 강성이 변화하는 구간으로, 강성차이에 따른 불균등침하 발생 가능성이 있다. 이러한 문제점은 기존철도에서도 발생하고 있으며, 600km/h 급의 초고속철도에서도 발생할 것으로 예상되지만 현재로서는 발생형태에 대해 예측이 어렵다. 따라서 현 단계에서 초고속철도의 접속부에 대한 이해와 적용성을 확보하기 위해서는 다방면의 접근이 필요하다. 이에 본 연구에서는 호남고속철도 접속부의 표준단면을 기준으로 열차의 속도대역별 변형특성을 파악하고자 하였다. 현재 실험을 통한 연구가 어려우므로 유한요소프로그램인 Abaqus 를 사용하여 이동윤하중 재하방식의 동적 수치해석을 이용하였다. 해석은 진동가속도와 수직변위에 대한 특성을 검토하였고, 진동가속도의 경우 현재 운행중인 300km/h 급 열차보다 약 2.7 배이상 큰 값이 나타났다. 향후 문제 발생이 예상되므로 초고속열차 운행을 위해서는 개선된 접속구조 연구가 필요하다. The transition zone is the section which roadbed stiffness is suddenly varied, it is possible to occur differential settlement because of differences in stiffness. This problem also occurs in a exist railway and also expected to occur even in ultra-high speed railway as 600km/h, but as of now it is difficult to predict of pattern. Thus, at the present stage require to multidirectional approach for understanding and adaptability of ultra-high speed railway transition zone. In this study, to verify this effect deformation characteristics by train speed on the basis of transition zone standard plan in Honam high-speed railway. Currently, it is difficult to use experimental study and take finite element program in Abaqus to dynamic analysis of moving wheel loading type. Study on characteristics of vertical acceleration and displacement, in the case of acceleration, which was more than two times value than 300km/h train. Since the expected future problems, it is require to study in order to improve structure of transition zone for ultra-high speed railway.
아날로그 로그 검출기를 활용한 C-Scan 고주파 초음파 시스템 구현
이강명(Gang-Myung Lee),박상호(Sang-Ho Park),백광렬(Kwang-Ryul Baek) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.4
In this paper, we implement a C-Scan 70 MHz ultrasonic system using an analog log detector, and we conduct experiments with this system. If a system with a 70 MHz ultrasonic system is implemented using conventional methods, the required sampling frequency ranges between 420 MHz to 700 MHz, which is 6 to 10 times the ultrasonic frequency. Instead, we propose a method to detect envelopes using an analog log detector in addition to a double probe structure to create a system with an ultrasonic frequency of 70 MHz. After implementing this system corresponding to the proposed method, we verified the performance of the system through the results. The results indicate that the sampling rate is approximately 0.057 times the ultrasonic frequency, resolving the data collection and storage space problem that is due to the high sampling rate found in high-frequency ultrasonic systems.