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Passive Method MASW 방법을 이용한 경산시 도심구간에서의 전단파 속도 분석
이홍규 ( Hong Gyu Lee ),김우혁 ( Woo Hyuk Kim ),장승익 ( Seung Ik Jang ),이석규 ( Seog Kyu Lee ) 대한지질공학회 2007 지질공학 Vol.17 No.4
표면파탐사 방법 중 능동형 다중채널 표면파탐사(active method MASW) 방법은 발진원의 저주파 에너지 부족, 전체 측선 길이의 부족 등의 요인으로 인하여 측정가능 심도가 강성이 약한 풍화토 지층까지로 제한됨으로서 대상 심도까지의 전단파 속도 주상도를 제공하는데 어려움이 있다. 이러한 단점을 극복하고자 신기술로서 제안된 수동형 다중채널 표면파탐사(passive method MASW) 방법을 대구 지하철 과업현장인 경산시 정평동 도심구간에 적용하고 분석을 수행하였다. 상시 미진동을 이용하는 수동형 다중채널 표면파탐사 방법은 파원의 차이에 따른 방향성 보정을 적용함으로써 분해능이 향상 되었고, 능동형 다중채널 표면파탐사 자료를 동일측선(동일배열) 상에서 간단한 병행수행 방법으로 획득할 수 있으며, 각각의 분산 스펙트럼 자료를 통합하여 분산곡선을 획득함으로서 가탐심도의 증대뿐 만 아니라 천부 해상도까지 높일 수 있는 장점이 있다. 이번 경산 도심구간에서는 수동형 다중채널 표면파탐사 방법의 현장 적용에 앞서 최적의 자료취득 변수들을 선정하기 위하여 2 m, 4 m, 6 m 수신기 간격 자료에 대한 분산 스펙트럼 분석을 수행하였고, 선정된 변수들을 적용함으로써 신뢰할 수 있는 전단파 속도 주상도를 작성할 수 있었다. Active method MASW(Multi channel Analysis of Surface Waves), which is one of the surface wave exploration methods, has the difficulties to supply enough shear wave velocity log, caused by short spread length and lack of low frequency energy. To make up this defect, the passive method MASW survey is taked and analysised in Daeku subway construction site, Jungpyung-dong Gyeongsan city. The passive method MASW using the microtremor, improve the quality of the overtone record by applying the azimuth correction caused offline sources. And combing with active overtone record which is acquired by same geometry has the benefits of improve shallow depth resolution and extend possible investigation depth. To take the optimized acquisition parameters, the 2 m, 4 m, and 6 m geophone spacing is tested. And 2 m spacing overtone image could make the reliable shear wave velocity log.
정주리(Jeong Ju-Ri),서규석(Seo Kyu-Seok),이석규(Lee Seog-Gyu),조은자(Jo Eun-Ja),나문수(Na Mun-Su),정진화(Jeong Jin-Hoa),오세일(Oh Se-Il),손명옥(Son Myong-Ok) 韓國營養學會 2009 Journal of Nutrition and Health Vol.42 No.3
This study was carried out to examine the proportion of fatty acids and contents of trans fatty acid in commercial processed foods in Jeon-Buk area. Contents of trans fatty acid in bakery products ranged from 0.2% to 1.0% per 100 g food. Especially garlic bread and pastry contained the highest amount. Popcorns contained trans fatty acid from 0.0% to 13.4%. Among them, instant popcorns for microwave contained the highest amount, while trans fatty acid was hardly detected in popcorns for theater. And trans fatty acid detected in popcorns was mostly in the form of 18:1 trans. The content of trans fatty acid in pizza was nearly 0.2%. Amounts of saturated fatty acid and unsaturated fatty acid were similar between each type of pizza and frozen pizza. Fritters such as fried chickens and vegetables contained trans fatty acid less than 0.2% per 100 g food.
오충석,이석규 金烏工科大學校 2000 論文集 Vol.21 No.-
We constructed a systematic durability analysis procedure in the automotive industry. By using the procedure, we performed an analysis for the lower control arm. We made a FE model and then evaluated the accuracy of the model through comparisons with actual strain measurements and constant amplitude fatigue tests. The cyclic material properties were obtained from low cycle fatigue tests with ASTM standard specimens. The shear strain distribution of the FE model was similar to that of the photo stress analysis in the longitudinal loading direction. The model predicted von Mises stresses measured from actual strain-gage measurements within 5% error. The fatigue life of the model agreed well with the bench test results within a factor of two. The signed bon Mises method showed the better fatigue life prediction than the absolute maximum principal or the signed Tresca method did. The proposed procedure proved to be very reliable quantitatively as well as qualitatively.