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

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.

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.

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,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.

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.

An Analysis of Less-able Students’ Motivation in their English Learning in the Primary Schools

심규남 한국초등영어교육학회 2010 초등영어교육 Vol.16 No.1

This small-scale study aims to analyze how less-able students in the primary schools perceive certain components of motivation with regard to their English language learning. Thus, it examines the less-able students’ current perception of their English language learning. In order to conduct this research, a close-ended questionnaire was adopted and quantitative data of 81 participants were obtained from ten primary schools; then factor analysis and multiple regression analysis were carried out. The results of the study reveal that generally there are two major components which have an effect on the participants’ motivation with respect to their English language learning: intrinsic motivation and parents. While having relatively low intrinsic motivation, the participants are generally encouraged to learn English in order to meet their parents’ expectations. A number of significant minor components were also found to be responsible for the participants’ motivation such as the participants’ self-efficacy and teachers. Tentative implications and recommendations for the development of the less-able students’ motivation regarding English language learning are discussed in the towards the end of the study.

무선랜 신호감도의 인식센서화를 이용한 방향 인식 연구

심규창,임승철 한국인터넷방송통신학회 2012 한국인터넷방송통신학회 논문지 Vol.12 No.5

스마트폰과 같은 무선랜이 내장된 포터블 디바이스의 보급으로 누구나 무선랜을 사용하고 있다. 하지만 이 러한 무선랜서비스는 인터넷의 접속과 위치 측위에 한정되어 있어 양질의 무선랜 서비스를 제공하는데는 한계가 있 다. 따라서 무선랜의 센서화를 통해 적외선 센서방식과 같은 다른 대체방식으로 무선랜의 기능을 응용하여 자동적으 로 위치를 인식할 수 있는 대체 인식 센서로서의 응용 방안을 제안하고자 한다. 센서화에는 무선랜과 엑세스포인트간 의 신호감도를 사용하며, 무선랜 안테나 무지향성 신호출력으로의 조작을 가하고 이를 인식센서로 가정하여 방향을 인식하는 본 논문에서 제안한 알고리즘을 통하여 포토 커플러 등의 직접적인 센서가 없이도 인식센서와 같은 기능을 무선랜과 엑세스 포인트 간의 연결감도를 활용하여 그 기능을 수행할 수 있었다. Portable devices such as smartphones with built-in wireless LAN to the prevalence of anyone using. But the wireless Internet connection and positioning services are limited to high-quality wireless service, they may not be available. Thus, wireless LAN infrared sensor in the same way as with angry alternative way wireless capabilities of the application automatically identify the location of the Sensor application as an alternative method is proposed. Thus, wireless LAN, such as infrared sensors and other alternzative methods of wireless features in a way where the application can recognize and automatically recognize the sensor application as an alternative method is proposed. Sensor is signals between wireless LAN and access points using the sensitivity, WLAN antenna with omni-directional signal output operation of the sensor is assumed to be recognize this by putting a direction to obtain through the proposed algorithm, Sensors such as photo-coupler without direct recognition sensor, wireless LAN and access points, the same function as the connection between the sensitivity to perform its function was to utilizing.

Development of the Mountain Search and Rescue System(MSRS) based on Ubiquitous Sensor Network

심규원,이주희 한국산림과학회 2007 한국산림과학회지 Vol.96 No.5