방탄소재 활용을 위한 SLS 유리 결정화의 효과

심규인,김태윤,최세영,Shim, Gyu-In,Kim, Tae-Yoon,Choi, Se-Young 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.1

For application of transparent bulletproof materials, the SLS(soda-lime-silicate) glass was heated by 2-step crystallization. The DTA curve for SLS glass revealed the nucleation and crystal growth temperature at about $575^{\circ}C$ and $675^{\circ}C$, respectively. The crystallized glass was heated at various conditions(temperature, time). As a result, the maximum nucleation and crystal growth rates were $3.8\times10^5/mm^3{\cdot}hr$ at $575^{\circ}C$ and 20.58nm/min at $680^{\circ}C$, respectively. The bending strength, fracture toughness and vickers hardness were 451.7MPa, $0.9388MPa{\cdot}m^{1/2}$, and $693.9H_v$ which were 201%, 31%, and 22% higher than parent glass, respectively. Surface image and transmittance of crystallized SLS glass were analyzed by optical microscopy and UV/VIS/NIR spectrophotometer. Transmittance of crystallized SLS glass at visible-range(200~800nm) was not changed.

금속유기화학증착법으로 사파이어 기판에 증착된 단층 SiO2, TiO2 저반사막의 광 투과율, 내열성, 기계적 특성에 관한 연구

심규인,엄형우,강형,최세영 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5

To improve sensing capability of infrared, heat-resistance and mechanical properties, the SiO2 and TiO2 antireflectivelayers were coated on sapphire substrate by MOCVD. The standard wavelength was 4,600nm, and thethickness of anti-reflective layers were 379 and 758nm in case of λ/4 and λ/2 of incident angle(65˚), respectively. The SiO2 and TiO2 anti-reflective layers were coated 12.6 and 9.7nm/min of deposition rates by increasing oxygenpressure to set the ideal refractive index of 1.283. In case of SiO2(λ/2) coating, the transmittance increased from55.0 to 62.7%. The transmittance of TiO2(λ/2) anti-reflective layer also increased from 55.0 to 64.8%. The flexuralstrength of SiO2(λ/2) and TiO2(λ/2) layer coated sapphire increased from 337.8 to 362.9 and 371.8MPa,respectively. The flexural strength at 500℃ of these materials also increased respectively to 304.5, 358.2MPa from265.9MPa. From these results, we confirmed these materials can be used as transmission window of infrared light.

금속유기화학증착법으로 사파이어 기판에 증착된 단층 SiO₂, TiO₂ 저반사막의 광 투과율, 내열성, 기계적 특성에 관한 연구

심규인,엄형우,강형,최세영,Shim, Gyu-In,Eom, Hyengwoo,Kang, Hyung,Choi, Se-Young 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5

To improve sensing capability of infrared, heat-resistance and mechanical properties, the $SiO_2$ and $TiO_2$ anti-reflective layers were coated on sapphire substrate by MOCVD. The standard wavelength was 4,600nm, and the thickness of anti-reflective layers were 379 and 758nm in case of ${\lambda}/4$ and ${\lambda}/2$ of incident angle($65^{\circ}$), respectively. The $SiO_2$ and $TiO_2$ anti-reflective layers were coated 12.6 and 9.7nm/min of deposition rates by increasing oxygen pressure to set the ideal refractive index of 1.283. In case of $SiO_2({\lambda}/2)$ coating, the transmittance increased from 55.0 to 62.7%. The transmittance of $TiO_2({\lambda}/2)$ anti-reflective layer also increased from 55.0 to 64.8%. The flexural strength of $SiO_2({\lambda}/2)$ and $TiO_2({\lambda}/2)$ layer coated sapphire increased from 337.8 to 362.9 and 371.8MPa, respectively. The flexural strength at $500^{\circ}C$ of these materials also increased respectively to 304.5, 358.2MPa from 265.9MPa. From these results, we confirmed these materials can be used as transmission window of infrared light.

투명 방탄소재용 보로실리케이트 유리의 이온교환 강화

심규인,엄형우,최세영,Shim, Gyu-In,Eom, Hyengwoo,Choi, Se-Young 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4

Transparent bulletproof windows play an important role in the munitions industry. The thickness of bulletproof windows including soda-lime silicate(SLS) glass, polyvinyl butyral, poly urethane, main defense(200MD), and safety film was reduced from 40mm to 29mm by adjustment of SLS glass laminated array. Borosilicate glasses generally have lower surface density and more excellent mechanical properties than SLS glass. Borosilicate glass was strengthened by ion exchange in the $KNO_3$ powder. The maximum mechanical properties were observed at $550^{\circ}C$ for 10min. The Vickers hardness, fracture toughness and 3-point bending strength of ion exchanged samples were about $775kg/mm^2$, $1.91MPa{\cdot}m^{1/2}$ and 764MPa each, which are about 27%, 149% and 249% higher than parent borosilicate glass, respectively. The penetration depth of K+ ion at $550^{\circ}C$ for 10min was $59.8{\mu}m$. As a result, the transparent bulletproof windows were predicted to be more lightweight by ion exchange of borosilicate glass. If the SLS glass for bulletproof windows is replaced by ion exchanged borosilicate glass, the bulletproof windows can be expected to be lightweight and thinner.

지르코니아 첨가된 보로실리케이트 유리의 결정화

심규인,김영환,임재민,최세영,Shim, Gyu-In,Kim, Young-Hwan,Lim, Jae-Min,Choi, Se-Young 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6

Borosilicate glass was prepared in the composition of 81% $SiO_2$, 4% $Na_2O$, 2% $Al_2O_3$, 13% $B_2O_3$. The albite phase($NaAlSi_3O_8$) increased with the $ZrO_2$(0~10wt.%) addition. For measurement of glass transition temperature($T_g$), crystallization temperature($T_{c,max}$) measured by differential thermal analysis. The $T_g$ and $T_{c,max}$ were $510{\sim}530^{\circ}C$ $650{\sim}670^{\circ}C$, respectively. The crystallized glass was heated at various conditions(temperature, time). After nucleation at $550^{\circ}C$ for 2hours prior to crystal growth at $650^{\circ}C$ for 4hours, the resulting Vickers hardness, fracture toughness and bending strength were about $736H_v$, $1.0779MPa{\cdot}m^{1/2}$, and 493MPa, which were 17%, 45% and 149% higher than parent borosilicate glass, respectively. Crystal size and transmittance of crystallized borosilicate glass were analyzed by FE-SEM, EDX and UV-VIS-NIR spectrophotometer. Transmittance of crystallized borosilicate glass was decreased with increasing $ZrO_2$(wt%) at visible-range. The results prove that light-weight bulletproof can be fabricated by the crystallization of borosilicate glass.

道德性 發達에 있어서 初期 놀이 活動의 意味

심규장(沈揆璋) 한국도덕교육학회 1990 道德敎育硏究 Vol.4 No.1

Development of Thin and Lightweight Bulletproof Windows Using Strengthened SLS Glass by Ion Exchange

심규인,박중구,김성환,안덕래,최세영 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.2

Soda-lime silicate (SLS) glass was strengthened by ion exchange for application of thin and lightweight bulletproof windows. The optimal conditions for ion exchanged SLS glass (thickness of 3 and 10 mm) at 480oC were 10 and 17 min, respectively. TheVickers hardness values of the strengthened SLS glass samples with thicknesses of 3 and 10 mm were 5.9 ± 0.22 and 6.7 ± 0.17GPa, respectively, which values were about 22% higher than those of parent SLS glass. By laminating a multilayer defense filmand polycarbonate sheet with ion exchanged SLS glass, we were able to make a thin and lightweight bulletproof window (24.25mm, 4.57 kg, 50.06 kg/m2, V50 901.8 m/s). As a result, the thickness of the bulletproof window was decreased by about 39% from40 to 24.25 mm. The light transmittance in the visible range satisfied the standard (over 76%) for bulletproof windows.

역사에 심은 참된 대화 - 성 프란치스코와 술탄 알 말릭 알 카밀의 만남 800주년

심규재 우리신학연구소 2019 가톨릭 평론 Vol.23 No.-

논문 : 보호지역 관리정책 수립을 위한 국민 환경의식 및 실천 행동수준 분석 -허베이 스피리트호 유류유출사고를 중심으로-

심규원 ( Kyu Won Sim ) 한국임학회 2012 한국산림과학회지 Vol.101 No.2

본 연구는 허베이 스피리트호 유류유출사고 이후 일반 국민의 환경의식과 환경보호를 위한 실천행동수준 분석을 통해 보호지역 관리정책 수립을 위한 기초자료를 도출하는데 그 목적이 있다. 이를 위해 2011년 5월부터 6월까지 5대 광역시(서울, 부산, 대구, 대전, 광주)에서 일반 국민 987명을 대상으로 현지조사를 실시하였다. 분석 결과 태안해안국립공원을 유류유출사고로 인한 피해복구지역으로 인지하거나, 자원봉사활동, 환경보호 및 보존 단체 및 교육프로그램에 참여한 경험 등과 같은 환경적 관심이 있을수록 환경에 대한 긍정적이고 적극적인 태도를 갖는 것으 로 나타났다. 따라서 본 연구의 결과는 생물학적 보전과 이용의 균형을 고려한 보호지역 관리에 기여할 것으로 판단된다. The purpose of this study intends to suggest a basic information to establish protected area policy by analyzing environmental consciousness and environmental protection behavior of citizen after Hebei Spirit oil spill. During May-June of 2011, a total of 987 respondents completed at 5 major cities (Seoul, Busan, Daegu, Daejeon, Gwangju) in Korea. The result showed that more previous experience of environment as recognition of oil spill damaged area, volunteer activity experience, participation in the organization for environmental conservation, and participation in education program led to more positive attitude to environment. Therefore, the result of this study will contribute to manage protected area in balancing ecological conservation and utilization.

위암 환자에서 복강 세척액의 CEA, CA19-9 측정의 임상적 의의

심규범,박지훈,구태영,민현식,Shim, Gyu-Beom,Park, Ji-Hun,Koo, Tea-Young,Min, Hyun-Sik 대한위암학회 2006 대한위암학회지 Vol.6 No.3

목적: 위암 환자에서 복강 내 파종은 대부분 장막을 침범한 원발성 암에서 떨어져 나온 복강 내 유리 암세포에 의해 이루어지는 것으로 가장 흔한 재발의 형태이다. 수술 중 이러한 유리 암세포의 존재를 직접 또는 간접적으로 확인할 수 있는 방법이 있다면 위암의 치료 전략을 정하는데 유용할 것이다. 이에 수술을 시행 받은 위암 환자를 대상으로 복강 세척액에서 CEA와 CA19-9의 검출 정도와 종양의 침윤도, 림프절 전이 및 병기 등과의 연관성을 알아보고자 연구를 시행하였다. 대상 및 방법: 2004년 5월부터 2006년 1월까지 건양대학교병원 외과에서 위암을 진단받고 수술을 시행한 130명의 환자를 대상으로 하였고, 모든 환자에서 복강 세척액을 채집하여 CEA, CA19-9를 측정하였다. 위의 비선암종 환자 14명을 대조군으로 하여 복강 세척액을 분석하였다. 결과: 위암 환자의 복강 CEA, CA19-9의 측정치는 종양의 침윤도, 림프절 전이 및 병기와 상관 관계가 있었으며(P<0.05) 복강 CEA 측정치는 비선암종 환자군과도 유의한 차이를 보였다. 결론: 복강 CEA, CA19-9의 증가는 TNM 병기와 부분적으로 평균치의 차이가 있고 복강 CEA는 다른 측정치에 비해 가치 있는 복막 전이 예측인자로서의 가능성을 확인하였다. Purpose: Free cancer cells exfoliated from cancer-invaded serosa contribute to peritoneal dissemination, the most frequent pattern of recurrence in patients with gastric cancer. To detect free cancer cells, CEA and CA19-9 were introduced as the markers of gastric cancer, and many methods, such as cytology, immunoassay, and reverse transcription polymerase chain reaction (RT-PCR), exist for detecting them. The aim of this study is to define the clinical significance of using immunoassay to measure the levels of CEA and CA19-9 in the peritoneal washings in patients with gastric cancer. Materials and Methods: The peritoneal washing fluids were obtained from 130 patients with gastric cancer who received a curative gastrectomy, palliative gastrectomy or open and closure. The pCEA and pCA19-9 levels were measured by using immunoassay and cytology. The results were compared with the clinicopathological data. Results: The pCEA and pCA19-9 levels were correlated with tumor invasion, lymph-node metastasis, and stage (P<0.05). Conclusion: A correlation was found between elevated pCEA and pCA19-9 levels measured by immunoassay and the TNM stage. Therefore, a combined pCEA and pCA19-9 assay could be a sensitive detector of peritoneal dissemination, as well as a predictor of postoperative prognosis. pCEA and pCA19-9 may also determine the adjuvant management strategy.