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Partial Connection-Aware Topology Synthesis for On-Chip Cascaded Crossbar Network
Minje Jun,Deumji Woo,Eui-Young Chung IEEE 2012 IEEE Transactions on Computers Vol.61 No.1
<P>The crossbar (also called bus matrix) solution is known as one of the most effective communication architectures for modern high-performance embedded systems. To make it even more effective, several topology synthesis methods have been proposed. They mostly generate a crossbar network in a cascaded fashion under the assumption that each crossbar switch is fully connected (i.e., each input has a connection to every output). This assumption often limits optimizing the area efficiency and/or performance of the network due to the unnecessary connections inside the crossbar switches. Some existing methods marginally improve their synthesis results by eliminating the unnecessary connections after the synthesis step. Such postprocessing approaches make sense since considering partially connected crossbar switches earlier in the synthesis flow can greatly increase the optimal topology search space, thereby increasing the runtime. However, the result from these postprocessing techniques is typically far inferior to that from the exhaustive search. In this work, we tackle such limitations of previous methods by introducing a heuristic method based on iterative switch merging. To the best of authors' knowledge, none of previous methods consider the partial connection of crossbar switches in the middle of the topology synthesis. Our experimental results prove the effectiveness of the proposed method by showing up to 30.35 percent of area saving against those methods that consider the partial connection only in a postprocess. The results also show the superiority of the proposed method against the existing topology synthesis methods, showing up to 49.09 percent area saving and synthesis time reduction by several orders of magnitude.</P>
Topology Synthesis of Cascaded Crossbar Switches
Minje Jun,Sungjoo Yoo,Eui-Young Chung IEEE 2009 IEEE transactions on computer-aided design of inte Vol.28 No.6
<P>Performance requirements of on-chip network increase as system-on-chips (SoCs) are becoming more and more complex. For high-performance applications, crossbar switch-based networks are replacing the traditional shared buses as the backbone networks in SoCs. In this paper, we tackle the topology design of on-chip networks with crossbar switches in a cascaded fashion. We also resolve the unacceptable complexity of our previous method based on mixed integer linear programming by a heuristic method. Experimental results show that the proposed method overcomes the frequency limitation of the single crossbar-based design, particularly when the wire delay effect is considered. The proposed heuristic method also achieves more area reduction (up to 69.5%) over the existing methods, and finds as good solutions as the exact method while the synthesis time is saved by orders of magnitude.</P>
Jo, Minje,Park, Kyung-Min,Park, Jun-Young,Yu, Hyunjong,Choi, Seung Jun,Chang, Pahn-Shick Elsevier 2020 Colloids and surfaces. A, Physicochemical and engi Vol.586 No.-
<P><B>Abstract</B></P> <P>In the present study, mono-dispersed 100 nm-sized liposomes (DPPC:cholesterol = 8:2 (mol)) were produced by a novel microfluidic assembly method with optimized flow rate ratio (non-aqueous phase:aqueous phase = 60.0:6.0 (mL/h)). These liposomes were incorporated with ionic surfactants, such as anionic palmitic acid (PAL) or cationic hexadecylamine (HDA), to enhance their colloidal stability, which was confirmed through TEM and ζ-potential analysis. Moreover, to enhance their intestinal stability, the surfaces of liposomes were modified with biodegradable polymers by electrostatic attraction. Specifically, cationic chitosan was coated onto anionic PAL-incorporated liposomes, whereas anionic pectin was used for cationic HDA-incorporated liposomes. Finally, branched-chain amino acids (BCAAs) were encapsulated into the PAL-incorporated liposomes with surface modifications, showing 31.2 % of encapsulation efficiency. This study could contribute a novel approach for microfluidic assembly of the liposomes, providing deeper insight into surface modifications and enhancement of the colloidal stability.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Han, Minje,Jun, Sun-Hee,Lee, Yun-Jin,Eun, Baik-Lin,Lee, Seung Jun,Seong, Moon-Woo,Park, Sung Sup,Song, Sang Hoon,Park, Hyung-Doo,Song, Junghan The Korean Society for Laboratory Medicine 2015 Annals of Laboratory Medicine Vol.35 No.4
<P>Metachromatic leukodystrophy (MLD) is an autosomal recessive disease caused by a deficiency in arylsulfatase A (ARSA). However, decreased ARSA activity is also observed in pseudodeficiency (PD). To distinguish between MLD and PD, we performed gene mutation and sulfatide analyses by using dried blood spots (DBSs) from seven Korean individuals who underwent an analysis of ARSA activity. DNA was extracted from DBSs, and PCR-direct sequencing of <I>ARSA</I> was performed. The cDNA obtained was analyzed to confirm a novel mutation. Of the seven subjects, three were confirmed as having MLD, one was confirmed as having MLD-PD, one was confirmed as having PD, and the remaining two were obligate heterozygotes. We verified the novel pathogenic variant c.1107+1delG by performing familial and cDNA analyses. Sulfatide concentrations in DBSs were analyzed and were quantified by using ultra-performance liquid chromatography and tandem mass spectrometry, respectively. Total sulfatide concentration was inversely correlated with ARSA activity (Spearman's coefficient of rank correlation, <I>P</I>=0.929, <I>P</I>=0.0025). The results of this mutational and biochemical study on MLD will increase our understanding of the genetic characteristics of MLD in Koreans.</P>
확률적 은닉 성분 분석에 기반한 드럼 Onset 검출 방법
한병준 ( Byeong-jun Han ),김연주 ( Yunjoo Kim ),이장우 ( Jangwoo Lee ),김민제 ( Minje Kim ),이교구 ( Kyogu Lee ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.2
특정 시간에 동시 연주된 다수 음원의 onset 을 검출하기 위해서는 음원 분리 문제가 선결되어야 한다. 특히, 드럼과 같은 조음(噪音) 악기 신호 검출 문제를 해결하기 위해서는 음원 분리 방법의 성능이 중요하다. 이에 본 연구에서는 효과적인 음원 분리 방법으로 알려진 확률적 은닉 성분 분석(PLCA) 방법에 기반한 주요 악기 신호의 onset 검출 방법을 제안한다. 효과적인 onset 검출을 위해, 첫째, 확률적 은닉 성분 분석으로 훈련 된 비음수 주파수 성분 중 최적의 성분을 선택하는 방법을 적용하고, 둘째, 드럼 악기 신호의 정확한 onset 검출을 위해 고안된 비음수 시계열 신호 threshold 방법을 적용한다. 실험에서는 제시된 방법을 이용하여 드럼의 주요 악기 신호 onset 검출 성능이 향상됨을 보인다.
Mixed Integer Linear Programming을 이용한 온칩 크로스바 네트워크 토폴로지 합성
전민제,정의영,Jun, Minje,Chung, Eui-Young 대한전자공학회 2013 전자공학회논문지 Vol.50 No.9
SoC내의 IP 개수 및 데이터 통신량이 증가함에 따라 온칩 크로스바 네트워크가 SoC의 중추 연결망으로서 널리 사용되어지고 있다. 온칩 크로스바 네트워크는 여러 개의 크로스바 스위치들과 이들간의 연결로 이루어지는데, 시스템의 복잡도가 증가함에 따라 IP들과 스위치들간의 연결 형태를 결정하는 것, 즉 토폴로지를 결정하는 것이 점점 복잡해지고 있다. 이 문제를 해결하기 위해 본 논문에서는 목표 시스템의 칩내 통신 특성을 고려하여 최적의 온칩 크로스바 네트워크의 토폴로지를 찾아주는 방법을 제안한다. 제안하는 토폴로지 합성 방법은 mixed integer linear programming(MIILP)를 이용하여 다른 휴리스틱 합성 방법과 달리 전역 최적점(global optimum)을 찾을 수 있는 장점이 있다. 또한, 기존에 제안 되었던 MILP를 이용한 토폴로지 합성 방법들이 토폴로지를 표현하는데 IP 노드들과 스위치들 간의 인접 행렬들을 이용했던 것과 달리, 본 논문에서는 IP들 간통신을 표현하는 엣지들을 기본으로 하는 새로운 표현 방식을 제안한다. 실험 결과 본 논문에서 제안하는 새로운 MILP 표현 방식을 이용할 경우 기존 MILP 표현 방식을 이용했을 때보다 4개의 예제들에 대해 합성 속도가 평균 77.1 배 향상되었다. As the number of IPs and the communication volume among them have constantly increased, on-chip crossbar network is now the most widely-used on-chip communication backbone of contemporary SoCs. The on-chip crossbar network consists of multiple crossbars and the connections among the IPs and the crossbars. As the complexity of SoCs increases, it has also become more and more complex to determine the topology of the crossbar network. To tackle this problem, this paper proposes an on-chip crossbar network topology method for application-specific systems. The proposed method uses mixed integer linear programming to solve the topology synthesis problem, thus the global optimality is guaranteed. Unlike the previous MILP-based methods which represent the topology with adjacency matrixes of IPs and crossbar switches, the proposed method uses the communication edges among IPs as the basic element of the representation. The experimental results show that the proposed MILP formulation outperforms the previous one by improving the synthesis speed by 77.1 times on average, for 4 realistic benchmarks.