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Shim, Jongmin,Lee, Jaehyuk,Ye, Youngjin,Hwang, Jongkook,Kim, Soo-Kil,Lim, Tae-Hoon,Wiesner, Ulrich,Lee, Jinwoo American Chemical Society 2012 ACS NANO Vol.6 No.8
<P>This study describes the one-pot synthesis and single-cell characterization of ordered, large-pore (>30 nm) mesoporous carbon/silica (OMCS) composites with well-dispersed intermetallic PtPb nanoparticles on pore wall surfaces as anode catalysts for direct formic acid fuel cells (DFAFCs). Lab-synthesized amphiphilic diblock copolymers coassemble hydrophobic metal precursors as well as hydrophilic carbon and silica precursors. The final materials have a two-dimensional hexagonal-type structure. Uniform and large pores, in which intermetallic PtPb nanocrystals are significantly smaller than the pore size and highly dispersed, enable pore backfilling with ionomers and formation of the desired triple-phase boundary in single cells. The materials show more than 10 times higher mass activity and significantly lower onset potential for formic acid oxidation as compared with commercial Pt/C, as well as high stability due to better resistivity toward CO poisoning. In single cells, the maximum power density was higher than that of commercial Pt/C, and the stability highly improved, compared with commercial Pd/C. The results suggest that PtPb-based catalysts on large-pore OMCSs may be practically applied as real fuel cell catalysts for DFAFC.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-8/nn301692y/production/images/medium/nn-2012-01692y_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn301692y'>ACS Electronic Supporting Info</A></P>
아웃소싱 데이터베이스에서 집계 질의를 위한 효율적인 인증 기법
신종민(Jongmin Shin),심규석(Kyuseok Shim) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.7
Outsourcing databases is to offload storage and computationally intensive tasks to the third party server. Therefore, data owners can manage big data, and handle queries from clients, without building a costly infrastructure. However, because of the insecurity of network systems, the third-party server may be untrusted, thus the query results from the server may be tampered with. This problem has motivated significant research efforts on authenticating various queries such as range query, kNN query, function query, etc. Although aggregation queries play a key role in analyzing big data, authenticating aggregation queries has not been extensively studied, and the previous works are not efficient for data with high dimension or a large number of distinct values. In this paper, we propose the AMR-tree that is a data structure, applied to authenticate aggregation queries. We also propose an efficient proof construction method and a verification method with the AMR-tree. Furthermore, we validate the performance of the proposed algorithm by conducting various experiments through changing parameters such as the number of distinct values, the number of records, and the dimension of data.
2포트 VNA를 이용한 멀티포트 S-parameter 변환에 관한 연구
김종민(Jongmin Kim),황보훈(Hoon Hwangbo),심민규(Minkyu Shim),설병수(Byungsoo Seol),이종성(Jongsung Lee),이형석(Hyungsuk Lee),나완수(Wansoo Nah) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, we study the algorithm for the multiport measurements using the 2port VNA(Vector network Analyzed. We explain the conversion algorithm which the open impedance to the matched impedance(50 ohm), and then we apply this algorithm to the 4 port VNA measurement. Finally, we discuss the reliability of this algorithm.
4포트 마이크로스트립 인터커넥트 회로 파라미터 추출에 대한 연구
심민규(Minkyu Shim),황보훈(Hoon Hwangbo),김종민(Jongmin Kim),나완수(Wansoo Nah),설병수(Byungsoo Seol),이종성(Jongsung Lee),이형석(Hyungsuk Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
본 논문에서는 4포트 마이크로스트립 인터커넥트에 대한 새로운 등가모델을 제시하였다. 제시된 방법에서는 마이크로스트립 인터커넥트 중 선로의 방향이 변하는 부분에서 등가회로 파라미터인 커패시터 성분을 모델화하여 최적화 과정을 통해 그 값을 추출하였고, 시뮬레이션 결과와 측정치를 비교함으로써 등가회로모델의 유효성을 확인하였다.
문화적 환경조성을 위한 옥외광고물 제도의 개선방안 연구
박종민(Park Jongmin),이명희(Lee Myunghee),김영배(Kim Youngbae),심성욱(Shim Sunguk) 한국옥외광고학회 2005 OOH광고학연구 Vol.2 No.1
우리나라의 옥외광고물등관리법에 대한 논란은 초기 법 시행에서부터 논란이 있어왔는데, 이는 우리나라의 옥외광고물등관리법과 그 시행령이 일본의 것을 그대로 옮겨 왔기 때문이다. 그러나 문제는 일본에서조차 쓰지 않는 법을 그대로 가지고 왔다는 데 있다. 따라서 이를 우리나라의 현실에 그대로 적용하기에는 무리가 따른다. 따라서 본 연구에서는 일반 시민을 비롯, 다양한 관계자들을 대상으로 우리나라 옥외광고물에 대한 이들의 인식은 어떠한지, 옥외광고물과 옥외광고물법에 대한 문제는 무엇인지를 조사하였다. 현행 옥외광고물등관리법의 문제점을 개선하기 위하여, 이를 개정한 ‘개정법령안’에 대해서도 지적할 수 있다. ‘개정법령안’을 살펴보면 이전의 법률보다 옥외광고물의 제한을 더 느슨하게 하는 경향이 있는데, 이는 오히려 개정법령안이 옥외광고물의 난립을 더 부추길 수 있다. There have been controversies over the Outdoor Advertisements. etc. Control Act in Korea since the beginning of the law. It was because the Outdoor Advertisements. etc. Control Act and its enforcement decree in Korea were drawn up exactly after those in Japan. Accordingly. it is unreasonable to apply these laws as they are to the realities in Korea. Thus the present study investigated how outdoor advertisements in Korea are perceived by various parties concerned including ordinary citizens and what problems are in outdoor advertisements and laws related to outdoor advertisements. In order to solve problems in the current Outdoor Advertisements. etc. Control Act, 'the proposed amendment' may need to be reviewed. 'The proposed amendment' rather tends to relax restrictions on outdoor advertisements compared to the previous law. which may encourage the disorderly proliferation of outdoor advertisements.
Metamatrial Resonator를 이용한 K-Band 저위상 잡음 Push Push OSC 설계
심우석(Wooseok Shim),이종민(Jongmin Lee),서철헌(Chulhun Seo) 大韓電子工學會 2012 電子工學會論文誌-TC (Telecommunications) Vol.49 No.2
In this paper, a push-push oscillator at K-band with a double H-shape metamaterial resonator (DHMR) based on high-Q is proposed with metamaterial structure to improve the phase noise and output power. The proposed oscillator shows low phase noise and high output power. DHMR is designed to be high-Q at resonance frequency through strong coupling of E-field. oscillators which are combined in push-push structure improve output power. The propose push-push oscillator shows the output power of 3.1 ㏈m, the fundamental signal suppression of -23.7 ㏈c and phase noise of -116.28 ㏈c at 100 ㎑ offset frequency and 20.20 ㎓ center frequency