DSP 시멘트를 이용한 중금속 이온의 고화

소정섭,최상홀 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.8

This study was subjected to the stabilization of heavy metals using DSp cement. Heavy metal Cr and Pb ions were mixed with cement paste and hydration behavior and leaching property by heavy metal were exami-ned. It was found that, Cr ion accelerated the early hydration of the cement and has no accelerating effect in later hydration period. However Pb ion retarded the hydration of the cement for a early hydration periods. As a result of leaching test the quantity of leachant has a very low value and the influence of leached heavy metal effected on the environments is very weak.

Easy airway management using the i-gelTM supraglottic airway in a patient with Treacher Collins syndrome

소정섭,최성욱,임춘학,이혜원,신혜원 대한마취통증의학회 2014 Korean Journal of Anesthesiology Vol.67 No.6

DSP시멘트를 이용한 $Cr^{3+}$ 이온의 고화

소정섭,최상흘 한국시멘트협회 1995 시멘트 심포지움 Vol.23 No.-

Magnesium Silicate-Carbonate계에 Mineral 혼합재를 사용한 Carbon negative Cement의 물성 평가

소정섭 ( Soh Jeongseob ),송훈 ( Song Hun ),추용식 ( Chu Yongsik ),이종규 ( Lee Jongkyu ) 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 학술발표회 논문집 Vol.17 No.1

MgCO₃와 사문석을 사용한 마그네시아 시멘트의 무기 첨가제 영향

이종규,소정섭,Lee, Jong-Kyu,Soh, Jung-Sub 한국재료학회 2015 한국재료학회지 Vol.25 No.2

The carbon dioxide($CO_2$) released while producing building materials is substantial and has been targeted as a leading contributor to global climate change. One of the most typical method to reducing $CO_2$ for building materials is the addition of slag and fly ash, like pozzolan material, while another method is reducing $CO_2$ production by carbon negative cement development. The MgO-based cement was from the low-temperature calcination of magnesite required less energy and emitted less $CO_2$ than the manufacturing of Portland cements. It is also believed that adding reactive MgO to Portland-pozzolan cements could improve their performance and also increase their capacity to absorb atmospheric $CO_2$. In this study, the basic research for magnesia cement using $MgCO_3$ and magnesium silicate ore (serpentine) as main starting materials, as well as silica fume, fly ash and blast furnace slag for the mineral admixture, were carried out for industrial waste material recycling. In order to increase the hydration activity, $MgCl_2$ was also added. To improve hydration activity, $MgCO_3$ and serpentinite were fired at $700^{\circ}C$ and autoclave treatment was conducted. In the case of $MgCO_3$ as starting material, hydration activity was the highest at firing temperature of $700^{\circ}C$. This $MgCO_3$ was completely transferred to MgO after firing. This occurred after the hydration reaction with water MgO was transferred completely to $Mg(OH)_2$ as a hydration product. In the case of using only $MgCO_3$, the compressive strength was 3.5MPa at 28 days. The addition of silica fume enhanced compressive strength to 5.5 MPa. In the composition of $MgCO_3$-serpentine, the addition of pozzolanic materials such as silica fume increased the compression strength. In particular, the addition of $MgCl_2$ compressive strength was increased to 80 MPa.

알칼리 활성화 알루미노실리케이트 경화체의 기본물성과 내열 특성

김원기,소정섭,김훈상,김홍주,이원준,이승헌 한국시멘트협회 2005 시멘트 심포지움 Vol.32 No.-

알칼리 활성화 슬래그 경화체의 물성에 미치는 자극제 종류 및 양생 조건의 영향

김원기,소정섭,배동인,김훈상,김홍주 한국시멘트협회 2002 시멘트 심포지움 Vol.29 No.-

MgCO₃와 사문석을 사용한 마그네시아 시멘트의 특성평가

이종규,소정섭,추용식,송훈,박지선,Lee, Jong-Kyu,Soh, Jung-Sub,Chu, Yong-Sik,Song, Hun,Park, Ji-Sun 한국재료학회 2012 한국재료학회지 Vol.22 No.11

MgO based cement for the low-temperature calcination of magnesite required less energy and emitted less $CO_2$ than the manufacturing of Portland cements. Furthermore, adding reactive MgO to Portland-pozzolan cement can improve their performance and also increase their capacity to absorb atmospheric $CO_2$. In this study, the basic research for magnesia cement using $MgCO_3$ and magnesium silicate ore (serpentine) as starting materials was carried out. In order to increase the hydration activity, $MgCO_3$ and serpentinite were fired at a temperature higher than $600^{\circ}C$. In the case of $MgCO_3$ as starting material, hydration activity was highest at $700^{\circ}C$ firing temperature; this $MgCO_3$ was completely transformed to MgO after firing. After the hydration reaction with water, MgO was totally transformed to $Mg(OH)_2$ as hydration product. In the case of using only $MgCO_3$, compressive strength was 35 $kgf/cm^2$ after 28 days. The addition of silica fume and $Mg(OH)_2$ led to an enhancements of the compressive strength to 55 $kgf/cm^2$ and 50 $kgf/cm^2$, respectively. Serpentine led to an up to 20% increase in the compressive strength; however, addition of this material beyond 20% led to a decrease of the compressive strength. When we added $MgCl_2$, the compressive strength tends to increase.

무기질 충진재와 폴리우레탄을 활용한 유·무기 복합 단열소재의 특성 평가

이종규,소정섭,노현경,Lee, Jong-Kyu,Soh, Jung-Sub,Noh, Hyun-Kyung 한국재료학회 2012 한국재료학회지 Vol.22 No.11

Recently, inorganic-organic hybrid materials have attracted much attention not only for their excellent thermal conductivity but also for their flame retardant properties. In this study, the properties of organic-inorganic hybrid insulating materials using inorganic fillers and polyurethane foam with different foaming conditions have been investigated. The addition of 1.5 wt% water to polyurethane as foaming agent shows the best foaming properties. The pore size was decreased in the foaming body with increasing of the $CaCO_3$ addition. The apparent density and thermal conductivity were increased by increasing the $CaCO_3$ addition. With an increasing amount of $CaCO_3$ powder, the flame retardant property is improved, but the properties of thermal conductivity and apparent density tend to decrease. When the addition of fine particles of $CaCO_3$, the apparent density and thermal conductivity were increased and, also, with the addition of coarse particles over $45{\mu}m$ in size, the apparent density and thermal conductivity were increased as well. In this study, the adding of $CaCO_3$ with average particle size of $27{\mu}m$ led to the lowest thermal conductivity and apparent density. After evaluation with different inorganic fillers, $Mg(OH)_2$ showed the highest thermal conductivity; on the other hand, $CaCO_3$ showed the lowest thermal conductivity.

In-plane three-step needle insertion technique for ultrasound-guided continuous femoral nerve block after total knee arthroplasty : a retrospective review of 488 cases

신현주,소정섭,임형환,주범준,이혜원,임혜자 대한마취통증의학회 2016 Korean Journal of Anesthesiology Vol.69 No.6

Background: Continuous femoral nerve block (CFNB) improves postoperative analgesia after total knee arthroplasty (TKA). The aim of this study was to investigate the clinical efficacy and complications of our in-plane three-step needle insertion technique that was devised to reduce the risk of direct femoral nerve injury during CFNB in anesthetized patients. Methods: This retrospective study included 488 patients who had undergone TKA. Ultrasound (US)-guided CFNB was performed under general or spinal anesthesia using an in-plane, three-step needle insertion technique. The success rate and difficulties of catheter placement, clinical efficacy of analgesia, and complications were recorded. Results: Femoral catheters were placed with a 100% success rate. In 488 patients, real-time US imaging revealed easy separation of the fascia iliaca and the femoral nerve following injection of local anesthetic through a Tuohy needle. Verbal numerical rating scale pain scores (0–10) were 2.0 ± 1.2, 3.5 ± 1.9, 3.2 ± 1.7, 2.9 ± 1.3, and 2.5 ± 1.1 at 1, 6, 12, 24 and 48 h postoperatively. No femoral hematoma, femoral abscess, or neurologic complications, including paresthesia or neurologic deficits, were observed during the 8-week follow-up period. Conclusions: This retrospective study suggests that an in-plane three-step needle insertion technique for CFNB may reduce the risk of femoral nerve injury in anesthetized patients.