스마트 LED 가로등용 컨트롤러 개발

윤태민,반호영,이찬길 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10

K₂O-CaO-SiO₂-P₂O₅계 유리의 형성 및 용출특성

윤태민,윤영진,이용수,강원호,Yoon Tae Min,Yoon Young Jin,Lee Yong Soo,Kang Won Ho 한국재료학회 2004 한국재료학회지 Vol.14 No.1

The glass-forming conditions are investigated in the $K_2$O-CaO-$SiO_2$ $-P_2$$O_{5}$ system with 10~65 mole% of$ P_2$$O_{5}$. Thermal properties and dissolution properties were investigated according to variation of the SiO and KO contents in selected compositions. The glass formation condition was determined when $K_2$O/$P_2$$O_{5}$ mole ratio 0~0.24, $SiO_2$/($SiO_2$+$P_2$$O_{5}$ ) mole ratio 0~0.29, and CaO/$P_2$$O_{5}$ mole ratio 0~1.00. In the result of the thermal properties, the glass transition temperature($T_{g}$) and softening temperature($T_{s}$ ) were gradually shifted to the lower temperature range with increase of $K_2$O contents. The maximum value of the chemical durability was shown in $K_2$$PO_2$$O_{5}$ mole ratio 0.17 when the $SiO_2$ contents were changed, and $K_2$O was fixed at 10 mole%. Hence the change of the $K_2$O/$P_2$$O_{5}$ mole ratio was found that a new main factor of the chemical durability.

스마트 LED 가로등용 컨트롤러 개발

윤태민(Taemin Yoon),반호영(Hoyoung Ban),이찬길(Chankil Lee) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10

In this paper we have presented a smart LED street lightening system to replace existing traditional lightening system. The proposed system is developed around ZigBee protocol which is an emerging ubiquitous sensor network (USN) technology. In this system a single node consists of an LED mounted on top of a controller, to which a number of sensors are wirelessly connected. Depending upon the illumination of LED. In order to communicate with other smart LED's each controller is connected with all other nodes so that a node can adjust its state according to the state of its surrounding nodes. In order to verify out proposed system in real time we have built the system using mel! and implemented in our institution. Other components of the proposed system arc: LED module, power driver board, main controller board, and ambient sensor board.

K2O CaO P2O5계 유리의 열적특성과 구조분석

윤영진,윤태민,이용수,강원호 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.2

K₂O·CaO·P₂O₅계 유리의 열적특성과 구조분석

윤영진,윤태민,이용수,강원호,Yoon, Young-Jin,Yoon, Tae-Min,Lee, Yong-Soo,Kang, Won-Ho 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.2

$K_2O{\cdot}CaO{\cdot}P_2O_5$를 기본조성으로 하여 용융법에 의해 유리 형성범위를 정의하고자 하였다. TG-DTA와 DSC를 이용하여 열적 특성을 관찰하고자 하였으며, FT-IR과 Raman Spectroscopy를 이용하여 구조를 분석하였다. $K_2O{\cdot}CaO{\cdot}P_2O_5$의 함량이 증가함에 따라 유리전이온도 및 연화온도는 감소하였다. $K_2O{\cdot}CaO{\cdot}P_2O_5$ 유리의 기본 구조는 이웃한 구조와 상호 결합을 위한 $PO_2$와 $PO_4^{3-}$ 구조와 유리의 골격구조를 이루는 P-O-P 결합이며, CaO의 함량이 증가함에 따라, 유리내의 P-O-P의 결합력은 점차적으로 증가하였으며, $PO_2$와 $PO_4^{3-}$의 intensity는 점차적으로 감소하였다. Various composition of $K_2O{\cdot}CaO{\cdot}P_2O_5$ glasses were studied by melting process to identify glass forming region. Thermal properties were observed by DSC and TG-DTA, structural properties were investigated by FT-IR and Raman Spectroscopy. The glass transition temperature (Tg) and softening temperature (Ts) were decreased with increasing $K_2O\;and\;P_2O_5$ contents. The basic structural unit of phosphate glasses is the $PO_2\;and\;PO_4^{3-}$ groups to make a cross-link and P-O-P group to form skeleton structure. As CaO content was increased, the P-O-P field strength in these glass was increased and intensity of $PO_2\;and\;PO_4^{3-}$ stretch was decreased.

인산염계 수용성 유리의 용출 및 구조 분석

윤영진,윤태민,이용수,강원호,Yoon, Young-Jin,Yoon, Tae-Min,Lee, Yong-Soo,Kang, Won-Ho 한국재료학회 2002 한국재료학회지 Vol.12 No.7

Potassium-Calcium-Phosphate glasses in range $XCaO\cdot(50-X)K_2O$ \cdot $50P_2$$O^{5}$were investigated. Glass transition temperature(Tg) of prepared glasses were below $520^{\circ}C$, thermal expansion coefficient from $270.3$\times$10^{7}$ to $604.5$\times$10^{7}$/$^{\circ}C$. The structure of XCaO.(50-X)$K_2$O\cdot$50P_2$$O^{5}$ glasses were examined by FT-IR spectroscopy indirectly. As CaO was increased, Ts, Tg, P-O-P bonding strength and chemical durability were increased. Glass surface change was observed with increasing dissolution time using bulk specimen, weight loss and pH change were measured as function of the dissolution time.

K₂O-CaO-MgO-SiO₂-P₂O₅계 유리의 제조 및 용출특성

이용수,윤태민,강원호 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.11

환경친화적인 유리비료로서의 응용을 위해 인산염계 유리의 용출특성에 대한 연구를 진행하였다. 0.1K₂O-0.1SiO₂-0.6P₂O/sub 5/계 유리를 기본조성으로 하고, CaO와 MgO의 함량변화를 준 다양한 유리조성에 대한 유리 형성 조건을 확인하고자 하였다. 또한 CaO 및 MgO의 함량변화에 따른 열적특성 및 용출 특성 변화를 확인하였다. MgO 함량의 증가에 따라 유리 전이온도 및 연화온도는 증가하였으며, CaO 및 MgO의 함량변화에 따라 용출특성에 큰 영향을 미치는 것을 확인하였다. For the application of environment conscious glass-fertilizer, dissolution characteristics of phosphate glass was investigated. In 0.1K₂O-0.1SiO₂-0.6P₂O/sub 5/ glass system, the compositions were designed according to variation of CaO & MgO contents, and glass formation region was confirmed. From the glass composition, the confirmed glasses were investigated to figure out thermal and dissolution properties. It was detected that glass transition & softening temperature of the glasses increased with increasing MgO contents. The dissolution properties of the glasses was affected by CaO and MgO content ratio.

K2O-CaO-MgO-SiO2-P2O5계 유리의 제조 및 용출특성

이용수,윤태민,강원호 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.11

환경친화적인 유리비료로서의 응용을 위해 인산염계 유리의 용출특성에 대한 연구를 진행하였다. 0.1K2O-0.1SiO2-0.6P2O5계 유리를 기본조성으로 하고, CaO와 MgO의 함량변화를 준 다양한 유리조성에 대한 유리 형성 조건을 확인하고자 하였다. 또한 CaO 및 MgO의 함량변화에 따른 열적특성 및 용출 특성 변화를 확인하였다. MgO함량의 증가에 따라 유리 전이온도 및 연화온도는 증가하였으며, CaO 및 MgO의 함량변화에 따라 용출특성에 큰 영향을 미치는 것을 확인하였다. For the application of environment conscious glass-fertilizer, dissolution characteristics of phosphate glass was investigated. In 0.1K2O-0.1SiO2-0.6P2O5 glass system, the compositions were designed according to variation of CaO & MgO contents, and glass formation region was confirmed. From the glass composition, the confirmed glasses were investigated to figure out thermal and dissolution properties. It was detected that glass transition & softening temperature of the glasses increased with increasing MgO contents. The dissolution properties of the glasses was affected by CaO and MgO content ratio.

K₂O·CaO·P₂O_5조성의 구조와 용출특성에 관한 연구

윤영진,윤태민,이영수,강원호 단국대학교 2001 산업기술연구 Vol.2 No.-

Various composition of K_2O·CaO·P_2O_5 glasses were studied by melting process to identify glass forming region. Thermal properties were observed by DSC and TG-DTA, structural properties were investigated by FT-IR and Raman Spectroscopy. Dissolution mechanism was observed by pH meter and Optical Microscopy. The glass transition temperature(Tg) and softening temperature(Ts) were decreased with decreasing CaO content. Tgand Ts was increased from 318℃ to 536℃, Ts was from 350℃ to 563℃ respectively with increasing CaO content, α was decreased from 201.5×10 exp (7) to 90.1×10 exp (7), as CaO content was increased, dissolution properties was decreased, pH has been changed acid as the times.

교정용 미니스크류의 디자인에 따른 식립 및 제거 토오크

차정열,윤태민,황충주 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.1

교정용 미니스크류의 원추 형태가 식립 후 시기별 안정성에 미치는 영향을 알아보기 위해, 시기별 제거 토오크 및 동요도와 조직시편분석을 시행하였다. 성견 6마리의 하악 협측골에 원통형과 원추형 교정용 미니스크류(Biomaterials Korea, Seoul, Korea) 48개를 식립하고, 식립 시 식립 토오크와 동요도를 측정하고 3주, 12주 동안 교정력을 부여한 후, 제거 시 제거 토오크와 동요도를 측정하였다. 식립 토오크는 원통형 미니스크류에서 13.6 Ncm, 원추형 미니스크류에서 22.3 Ncm로 원추형 미니스크류에서 높은 식립 토오크가 측정되었다 (P < 0.001). 식립 3주째 제거 토오크는 원통형 미니스크류에서 5.7 Ncm, 원추형 미니스크류에서 9.1 Ncm로 유의한 차이가 관찰되었다(P < 0.05). 식립 12주째 원추형 미니스크류의 제거 토오크는 3.6 Ncm로 유의하게 감소하여(P < 0.05) 원통형 미니스크류의 4.2 Ncm와 유의한 차이를 보이지 않았다. 이상의 결과로 미니스크류의 원추 구조는 식립 토오크를 유의하게 증가시켜 식립 후 3주간 안정성에 도움이 되었으나, 12주 후 안정성에 있어서는 원통형 미니스크류와 유사하였음을 시사한다. Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (P < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (P < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.