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Effects of Heat Treatment on the Thermoelectric Properties of Yb-filled Skutterudites
박관호,임영수,서원선,김일호 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.9
The p-type Yb-filled skutterudites Yb0.9Fe3CoSb12 were prepared by encapsulated melting andhot pressing, and the effects of heat treatment on the phase transformation, microstructure, andthermoelectric properties were examined. The ingots were melted at 1323 K, cooled in a furnace orin a water bath, and then annealed at 873 K for 24 to 100 h. The ingots were ground into powdersand consolidated by hot pressing at 873 K for 1 h. According to the X-ray diffraction analysis andthe Rietveld refinement, the water-quenched specimen had more Yb-filled skutterudites and fewerYbSb2 phases compared to the furnace-cooled sample. All the specimens were transformed into theskutterudite phases by annealing. The dimensionless figure-of-merit value (ZT) was increased byabout 50% by a subsequent annealing after water quenching. The water quenching suppressed theformation of secondary phases due to the sluggish peritectic reaction for the skutterudite phase.
열간압축성형으로 제조한 Co<sub>1-x</sub>Fe<sub>x</sub>Sb<sub>3</sub>의 열전특성
박관호,어순철,김일호,Park, Kwan-Ho,Ur, Soon-Chul,Kim, Il-Ho 한국재료학회 2006 한국재료학회지 Vol.16 No.7
The hot pressing was employed to prepare Fe-doped $CoSb_3$ skutterudites and their thermoelectric properties were investigated. Single phase ${\delta}-CoSb_3$ was successfully obtained by the hot pressing under 60MPa at 773 K for 2 hrs. Iron atoms acted as electron acceptors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by the appropriate doping. $Co_{0.7}Fe_{0.3}Sb_3$ was found as an optimum composition for the best thermoelectric property in this work.
Bombyx mori b-tubulin Promoter for High-level Expression of Heterologous Genes
박관호,구태원 한국잠사학회 2019 International Journal of Industrial Entomology Vol.39 No.1
We previously isolated 9 clones that show stronger signal compared to Bombyx mori cytoplasmic actin gene (BmA3) by using a dot blot hybridization. In this study, we focused on one clone among these clones which has high amino acid similarity with b-tubulin gene of B. mori. This clone was ubiquitously expressed in all tissues and developmental stage of B. mori. As result of promoter assay using dual luciferase assay system, we found the highest transcription activity region (-750/-1) in the 5’-flanking region of b-tubulin gene, which has about 47 fold more intensive promoter activity than BmA3 promoter. Moreover, the b-tubulin promoter was normally regulated in Bm5, Sf9, and S2 cells. Therefore, we suggest that b-tubulin promoter may be used more powerful and effectively for transgene expression in various insects containing B. mori as a universal promoter.
에너지 하베스팅 센서네트워크에서 데이터의 긴급성을 고려한 QoS기반 MAC프로코콜 설계
박관호,박형근,Park, Gwanho,Park, Hyung-Kun 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.8
에너지 하베스팅 센서네트워크에서는 노드의 전력상황을 고려하여 중계노드를 선택하는 매체접근제어 프로토콜이 요구된다. 기존의 EH-WSN (Energy harvesting wireless sensor network)의 연구들은 전력측면을 강조하다보니 센싱된 데이터의 긴급성과 같은 QoS (Quality of Service)를 크게 고려하지 못했다. 데이터의 긴급성에 따라 요구되는 전력 상황과 전송지연이 달라지도록 하여 데이터의 QoS에 맞는 매체접근이 이루어질 수 있도록 해야 한다. 중계노드의 경우 긴급하지 않은 상황에서 전력에 상관없이 모든 데이터를 중계하게 되면 막상 긴급 데이터가 발생할 경우 전력문제로 인해 지연이 크게 발생하는 상황이 생길 수 있다. 본 논문에서는 데이터의 긴급성에 따라 중계노드에 요구되는 전력상황을 다르게 설정함으로써 긴급데이터 발생 시에 발생할 수 있는 전력부족상황을 최소화하는 매체접근제어프로토콜을 설계하고 시뮬레이션을 통해 그 성능을 분석하였다. 성능분석결과 긴급데이터의 시간지연 및 신뢰성 성능이 향상됨을 확인할 수 있었다. In the EH-WSN (Energy harvesting wireless sensor network), a MAC (medium access control) protocol is required to select a relay node considering the power status of a node. Existing EH-WSN studies emphasize the power aspect, so it does not consider the QoS like the urgency of the sensed data. The required power and transmission delay must be changed according to the urgency so that the medium access control according to the data QoS can be performed. In case of relay node, relaying data without consideration of data urgency and node power may cause delay due to power shortage in case of urgent data. In this paper, we designed a MAC protocol that minimizes the power shortage that can occur during emergency data generation. For this, relay node requirements are set differently according to the urgency of data. The performance was analyzed through simulation. Simulation results show the reduced latency and improved reliability of urgent data transmission.