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이강문 ( Kang Moon Lee ) 대한소화기학회 2008 대한소화기학회지 Vol.52 No.1
Nutrition, as a definite environmental factor, has been implicated in the pathogenesis of inflammatory bowel disease (IBD). Although low-fiber, high-sugar, and high-animal fat diets have been proposed as a risk factor, the role of nutrition in IBD still needs more conclusive evidence. Nutritional deficiency is a common problem in IBD patients. The goals of nutritional intervention are the prevention and correction of malnutrition, the prevention of osteoporosis, and the promotion of optimal growth and development in childhood. Enteral nutrition is effective in induction and maintenance of the clinical remission in adults and promoting growth in children with Crohn`s disease. The n-3 polyunsaturated fatty acids contained in fish oil may provide short-term benefit to patients with IBD. (Korean J Gastroenterol 2008;52:1-8)
자동차 브레이크용 마찰재 내의 강철섬유, 지르콘, cashew가 creep groan에 미치는 영향
이강선(Kang Sun Lee),조민형(Min Hyung Cho),장호(Ho Jang),김대환(Dae Hwan Kim),정근중(Geun Joong Jeong),송현우(Hyun Woo Song) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
Friction characteristics of a low-steel friction material were examined to investigate creep groan phenomena. The amount of three ingredients (steel tiber. ZrSiO₄, cashew) were changed to produced test specimens using a constrained mixture design. Tribological properties of the friction material specimens were obtained by using a 1/5 scale dynamometer. Results showed that the amount of three different ingredients strongly affected the level of friction coefficient and the difference between the static friction coefficient and the kinetic friction coefficient (△μ). ZrSiO₄ and steel fiber tended to increase the average friction coefficient and aggravated the stick-slip phenomena and creep groan propensity. On the other hand. cashew tended to decrease average friction coefficient and △μ.
자동차 브레이크용 마찰재 내의 강철섬유, 지르콘, 캐슈가 크립 그론에 미치는 영향
이강선(Kang Sun Lee),이은주(Eun Ju Lee),장호(Ho Jang),정근중(Geun Joong Jeong),송현우(Hyun Woo Song) 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.6
Friction characteristics of a low-steel friction material were examined to investigate creep groan phenomena. The amount of three ingredients (steel fiber, ZrSiO₄, cashew) were changed to produce test specimens using a constrained mixture design. Tribological properties of the friction material specimens were obtained by using a 1/5 scale dynamometer. Results showed that the amount of three different ingredients strongly affected the level of friction coefficient and the difference between the static friction coefficient and the kinetic friction coefficient (?μ). ZrSiO4 and steel fiber tended to increase the average friction coefficient and aggravated the stick-slip phenomena suggesting high creep groan propensity. On the other hand, cashew tended to decrease average friction coefficient and ?μ.
압밀도 및 치환율 변화에 따른 미관통 SCP 지반의 압밀해석
이강일(Lee Kang-Il),이재욱(Lee Jae-Wook),임은상(Im Eun-Sang),주경원(Ju Kyung-Won) 한국토목섬유학회 2012 한국지반신소재학회 논문집 Vol.11 No.2
미관통 SCP공법은 개량 대상지반인 연약점토층 밑에 존재하는 지지층까지 모래말뚝을 관통시키지 않고 미관통 상태 그대로 SCP를 지반 중에 조성하는 공법으로 본 연구에서는 저치환율인 경우 압밀도에 따른 미관통 SCP공법과 관통 SCP 공법을 병용한 복합지반의 압밀침하 거동을 수치해석을 통해 비교 하였다. 본 연구결과 관통 SCP지반의 침하특성은 압밀도에 상관없이 거의 일정하나 미관통 SCP지반의 침하특성은 압밀도가 감소하고 관통율(Hd/H)이 감소할수록 상부점토지반의 침하량이 더 크게 증가되었다. 또한 미관통 SCP의 하단부에는 응력집중효과가 발휘되지 않았으며 응력분담비는 압밀도에 관계없이 거의 일정한 양상을 보였다. Partially penetrated SCP method is to install sand compaction piles in a soft clay layer not penetrating to the bed layer. In this study, consolidation behaviors of soft grounds improved by both partially and fully penetrated SCP methods are presented. When the replacement ratio is low, the settlement characteristic of the ground improved by fully penetrated SCP method seems to be consistent regardless the degree of consolidation. On the other hands, the ground improved by partially penetrated SCP method appears to decrease depending on the degree of consolidation. In addition, the settlement of upper clay layer is more increasing as the penetration ratio (Hd/H) is decreasing. No effect of stress concentration at the lower part of the partially penetrated SCP method is developed. The ratio of stress sharing appears to be almost consistent regardless the degree of consolidation.
자동차 브레이크용 마찰재에 사용되는 원료가 크립 그론(creep groan) 특성에 미치는 영향
이강선(Kang Sun Lee),조민형(Min Hyung Cho),이은주(Eun Ju Lee),장호(Ho Jang),정근중(Geun Joong Jeong),송현우(Hyun Woo Song) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Friction characteristics of a low-steel friction material were examined to investigate creep groan phenomena. The amount of ingredients (steel fiber, ZrSiO₄, cashew, natural graphite, artificial graphite, cokes) was changed to produce test specimens using a constrained mixture design. Tribological properties of the friction material specimens were obtained by using a 1/5 scale dynamometer. Results showed that the amount of different ingredients strongly affected the level of friction coefficient and the difference between the static friction coefficient and the kinetic friction coefficient (Δμ). ZrSiO₄, steel fiber and cokes tended to increase the average friction coefficient and aggravated the stick-slip phenomena that determinded creep groan propensity. Cashew and natural graphite tended to decrease average friction coefficient and Δμ. The change of the friction characteristics according to the ingredients suggested that the formation of the friction film on the brake pad was strongly affected the brake performance of the friction materials.
이강일(Lee Kang-Il),강준호(Kang Jun-Ho),김태훈(Kim Tae-Hoon) 한국토목섬유학회 2009 한국지반신소재학회 논문집 Vol.8 No.3
붕적층을 포함하는 복합지반의 경우 역의 최대입자크기가 매우 크고, 붕적층을 구성하는 토질의 입도분포가 지역마다 다양하여 시험을 통한 설계지반정수 산정은 매우 어렵다. 또한 이러한 지층의 응력-변형율 거동은 블록(자갈, 전석 등)과 기질(모래, 실트 등)부 경계면의 공학적 성질에 좌우되지만 통상적으로 강도가 작은 기질부의 특성으로 강도정수가 결정되어 대상지반이 과소평가되기 쉽다. 따라서 본 연구에서는 대상지역에 대한 대규모 트렌치 조사를 실시하고 굴착면에 대한 스캔라인 및 이미지 분석을 통한 역의 분포비율을 결정하고 이들 역의 분포비율과 기질부 강도정수를 BIMROCK 모형곡선에 적용하여 대상지역 붕적층의 강도정수 범위를 추정하였다. 마지막으로 강도정수의 적정성을 대상지층에 대하여 한계평형해석을 통해 검증한 결과 합리적인 전단강도를 평가할 수 있었다. Determination of design parameters of composite ground including colluvial soil layer is far difficult because the maximum particle size of such a soil is remarkably large and particle distribution may vary from area to area. The stress-strain behavior of colluvial soils is in fact dependent upon the engineering characteristics at the boundary between coarse and fine materials. However, strength parameters are in general determined based on the characteristics of fine material, which causes an underestimation of such parameters. In this study, strength parameters of colluvial soil are evaluated by means of BIMROCK model curve. In addition, limit equilibrium analysis is carried out to verify the rational shear strength evaluation.