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저노현장파쇄 순환골재의 동상방지층 및 빈배합콘크리트기층 정용성평가
김진철,심재원,조규성,Kim Jin-cheol,Shim Jae-won,Cho Kyou-sung 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.4
고속도로 건설 및 유지관리 과정에서 발생되는 폐콘크리트의 현장파쇄 및 재활용을 위하여 파쇄시스템 선정, 순환골재 생산, 도로용 재료의 시방기준 준수여부를 평가하였다. 그 결과 순환골재에 부착된 모르터의 영향으로 천연쇄석에 비하여 낮은 물성값을 나타내었으며, 입도시험결과 임팩트 크러셔 또는 죠, 큰크러셔 조합형은 소요입도에 적합한 순환골재를 생산할 수 있었다. 동상방지층에 적용할 경우 함수비 변동에 의한 건조밀도 변화가 작으므로 천연골재에 비하여 관리가 쉬운 장점이 있으나, 빈배합콘크리트 기층은 시멘트에 의한 미분량 증가로 흡수율의 영향이 감소하였다. 또한 재령 7일 압축강도는 순환골재의 종류에 관계없이 10MPa를 상회하므로 현장적용에는 큰 문제가 없음을 알 수 있었다. In order to recycle the waste concrete from which the reproductive aggregate should be produced in-situ, the applicability of crushers and recycled aggregates, and the compliance with the specification have been evaluated comprehensively. As a result of them, the properties of recycled aggregate particles were inferior to the natural one because of the adherent mortars on the recycled one, and the mobile impact crusher and the eccentric-mounted cone and jaw were superior to the others for the graded aggregates. In the case of anti-frost layer, the recycled one was easily controlled since the dry densities, contrary to natural one, were not largely changed with the moisture contents. It was found that the lean concrete base course is not influenced by absorption as cement dust grows larger, and the 7-day compressive strengths of lean concrete were higher than 10 MPa regardless of the crushing type.
김진철,Kim, Jin-Cheol 에너지절약전문기업협회 2008 esco Vol.51 No.-
최근 유가가 고공행진 중이다. 정부는 고유가 대책으로 안정적인 자원확보와 동등하게 에너지절약에 심혈을 기울인다. 자원확보도 중요하지만 이 자원을 어떻게 효율적으로 이용할 것인가에 대한 해법을 찾고 있다. 이 문제에 대해 이명박 대통령도 지식경제부 업무보고서 에너지절약의 중요성을 강조한 바 있다. 육지에서 바다를 건너야 닿을 수 있는 제주특별자치도(이하 제주도). 묵묵히 에너지절약을 선도하는 기업이있다. 주인공은 (주)도암엔지니어링(이하 도암) 이 회사는 도시계획.건축설게 토목설계 종합감리 등을 중심으로 미래 촉망받는 ESCO사업과 신.재생에너지사업으로 사업영역을 확대하면서 발빠른 행보를 늦추지 않고 있다. 사업분야 다양화와 뭍으로의 사업영역 확대, 제주도에서 불기 시작한 바람이 육지를 강타하고 있다.
김진철,최석철,Kim, Jin-Chul,Choi, Seok-Cheol 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.1
Many advanced countries including the U.S. consider defense standardization as a critical task for the efficient acquisition and effective operation of weapon systems and have implemented the appropriate standardization policy by synchronizing the defense acquisition strategies and nation standardization policy with defense standardization. It is required to develop the long-term defense standardization policy that can cope with the future domestic and international defense environmental changes. Therefore, it is an inevitable task to investigate the standardization trends and strategy in the domestic and international perspectives. The study aims to provide the vision of defense standardization policy, act/regulation, organization/personnel, education/training and information system.
김진철,양성철,조윤호,김남호,Kim, Jin-Cheol,Yang, Sung-Chul,Cho, Yoon-Ho,Kim, Nam-Ho 한국도로학회 2004 한국도로포장공학회 논문집 Vol.6 No.1
The characteristics of concrete strength and fracture parameters of recycled aggregate concrete were investigated to apply to the concrete pavements. As the results, the early strength of recycled aggregate concrete showed to be lower than that of natural coarse aggregate concrete, whereas strength at 28 days showed to be similar. Young's modulus of recycled aggregate concrete was lower than that of natural coarse aggregate concrete due to the difference of aggregate strength. And recycled aggregate concrete contained with ground granulated blast furnace slag seemed to have an effect of strength increasing. The critical stress intensity factor of recycled aggregate concrete at the early age was increased, and converged to be similar, compared to natural aggregate concrete at later age. The reliability of two-parameter fracture model was identified by the good correlation between the theoretical value computed by P-CMOD relationship and experimental results for Young's modulus and tensile strength. 본 연구는 재생골재를 사용한 콘크리트의 강도 및 파괴특성을 고찰하므로써 콘크리트 포장체에 적용성 여부를 검토하기 위해 수행하였다. 재생콘크리트의 초기강도는 낮았으나 재령 증가에 따라 기준콘크리트와 거의 유사한 값을 나타내었으며. 탄성계수는 골재 강성 차이로 인하여 낮게 나타났다. 또한 고로슬래그 미분말을 혼합한 재생콘크리트의 강도개선효과를 확인할 수 있었다. TPFM에 의한 파괴에너지는 초기재령에서 재생콘크리트의 파괴특성이 우수한 것으로 나타났으나, 재령증가에 따라 기준콘크리트와 유사한 값으로 나타났다. 또한 P-CMOD 측정결과로부터 이론적으로 구한 탄성계수 및 인장강도와 실험으로 구한 탄성계수 및 쪼갬인장 강도사이의 상관성은 매우 높은 결과를 나타내어 시험방법의 신뢰성을 확인할 수 있었다.
라식 수술 후 압평안압계와 비접촉성 안압계 측정치간 큰 차이를 보인 1예
김진철,정태영,기창원.Jin Chul Kim. M.D.. Tae Young Chung. M.D.. Chang Won Kee. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.6
Purpose: To report the case of a glaucoma patient with a history of LASIK surgery who presented with a wide discrepancy in intraocular pressure between the Goldmann applanation tonometry and non-contact tonometry. Methods: A 20-year-old male glaucoma patient was referred to our clinic with a chief complaint of blurred vision in his right eye. The patient had a history of uneventful bilateral LASIK surgery. Upon our initial examination, his best-corrected visual acuity in the right eye was 0.04 and his right eye IOP was 14 mmHg by Goldmann applanation tonometry and 40 mmHg by non-contact tonometry. A slit lamp examination showed corneal epithelial edema with diffuse interface opacities. The central corneal thickness in the right eye was 587 ?m. An ultrabiomicroscopy demonstrated an interface fluid accumulation between the LASIK flap and the stromal bed. The patient was diagnosed with juvenile open-angle glaucoma and was scheduled for a trabeculectomy. Results: Seven days after trabeculectomy, the patient`s vision in the right eye improved to 0.7 and his IOP was 12 mmHg by Goldmann applanation tonometry and 14 mmHg by non-contact tonometry. In addition, the corneal epithelial edema, interface opacities, and fluids had all resolved and the central corneal thickness was reduced to 489 ?m. Conclusions: In eyes that have undergone LASIK surgery, the IOP measured by Goldmann applanation tonometry may underestimate the true pressure due to fluid accumulation under the LASIK flap. In such cases, non-contact tonometry can be a convenient and a reliable method for determining treatment plan.