• Title/Summary/Keyword: Branch system

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Aluminium Salt of Phosphomolybdic Acid Fabricated by Nanocasting Strategy: An Efficient System for Selective Oxidation of Benzyl Alcohols

  • Aliyan, Hamid;Fazaeli, Razieh;Habibollahi, Nasibeh
    • Journal of the Korean Chemical Society
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    • v.56 no.5
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    • pp.591-596
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    • 2012
  • Preparation of $AlPMo_{12}O_{40}$ (AlPMo) salts, supported on mesostructured SBA-15 silica, by the reaction deposition strategy causes the formation of isolated AlPMo nanocrystals inside the nanotubular channels. The remarkable characteristic of the SBA-15 structure is that all the cylindrical pores are connected by some small channels. This makes the whole pore system in SBA-15 three-dimensional. We have used 2D hexagonal SBA-15 silicas as hard templates for the nanofabrication of AlPMo salt nanocrystal. The oxidation of alcohols occurs effectively and selectively with $H_2O_2$ as the oxidant. AlPMo salt nanocrystal was used as the catalyst.

THE VI CCD PHOTOMETRY OF THE GLOBULAR CLUSTER M22

  • CHO DONG HWAN;LEE SEE-WOO;SUNG HWANKYUNG
    • Journal of The Korean Astronomical Society
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    • v.31 no.1
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    • pp.67-74
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    • 1998
  • The VI CCD photometry is made for stars in the globular cluster M22 down to $V\approx19^m,\;I\approx18^m$. In the color-magnitude diagram (CMD), red giant branch (RGB), asymtotic giant branch (AGB) and blue horizontal branch (BHB) are well defined. The luminosity functions (LF) of RGB, AGB and BHB stars are derived, discussing deficient gaps and bumps in the CMD. The anomalously wide RGB seen in the BV photometric system is found to disappear in the VI photometric system.

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A Study on Voltage Stability Improvement by the Efficient Network Reconfiguration Algorithm

  • Kim, Byung-Seop;Shin, Joong-Rin;Park, Jong-Bae;Shin, Yong-Hak
    • KIEE International Transactions on Power Engineering
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    • v.4A no.2
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    • pp.58-68
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    • 2004
  • This paper presents an optimal routing algorithm (ORA) for maximizing voltage stability as well as for minimizing power loss in radial power systems. In the proposed ORA, a novel voltage stability index (VSI) for real-time assessment is newly introduced based on the conventional critical transmission path framework. In addition, the suggested algorithm can automatically detect the critical transmission paths resulting in voltage collapse when additional real or reactive loads are added. To implement an effective ORA, we have developed an improved branch exchange (IBE) method based on a loss calculation index and tie-branch power flow equations, which are suggested for real-time applications. The proposed algorithm has been tested with IEEE test systems as well as a large-scale power system in Korea to demonstrate its effectiveness and efficiency.

New Evaluation on Correlated MRC Diversity Reception for the Detection of Signals over Wireless Fading Channels

  • Kim, Chang-Hwan;Kim, Hyeong-Kyo
    • Journal of the Institute of Convergence Signal Processing
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    • v.10 no.2
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    • pp.136-140
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    • 2009
  • The performances of M-ary signals using L-branch maximum ratio combining (MRC) diversity reception in correlated Nakagami fading channels are derived theoretically. The coherent reception of M-ary differential phase shift keying (MDPSK), phase shift keying (MPSK), and quadrature amplitude modulation (MQAM) is considered. It is assumed that the fading parameters in each diversity branch are identical. The general formula for evaluating symbol error rate (SER) of M-ary signals in the independent branch diversity system is presented using the integral-form expressions. Until now, results did not extend to the various M-ary case for a coherent reception. The numerical results presented in this paper are expected to provide information for the design of radio system using M-ary modulation method for above mentioned channel environment.

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An Assembly-Type Flowshop Scheduling Problem with Outsourcing Allowed (부품외주를 고려한 조립형 Flowshop 일정계획문제 연구)

  • Juhn, Jae-Ho
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.29 no.4
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    • pp.34-42
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    • 2006
  • This paper considers an assembly-type flowshop scheduling problem in which each job is assembled with two types of components. One type of the components is outsourced with positive lead time but the other type is fabricated in-house at the first stage. The two types of the components should be prepared at the first stage before starting the assembly operation for each job at the second stage. The objective is to schedule the jobs so that the makespan is minimized. Some solution properties and lower bounds are derived and incorporated into a branch and bound algorithm. Also, an efficient heuristic is developed. The performances of the proposed branch and bound algorithm and heuristic are evaluated through computational experiments.

Partial Offloading System of Multi-branch Structures in Fog/Edge Computing Environment (FEC 환경에서 다중 분기구조의 부분 오프로딩 시스템)

  • Lee, YonSik;Ding, Wei;Nam, KwangWoo;Jang, MinSeok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.10
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    • pp.1551-1558
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    • 2022
  • We propose a two-tier cooperative computing system comprised of a mobile device and an edge server for partial offloading of multi-branch structures in Fog/Edge Computing environments in this paper. The proposed system includes an algorithm for splitting up application service processing by using reconstructive linearization techniques for multi-branch structures, as well as an optimal collaboration algorithm based on partial offloading between mobile device and edge server. Furthermore, we formulate computation offloading and CNN layer scheduling as latency minimization problems and simulate the effectiveness of the proposed system. As a result of the experiment, the proposed algorithm is suitable for both DAG and chain topology, adapts well to different network conditions, and provides efficient task processing strategies and processing time when compared to local or edge-only executions. Furthermore, the proposed system can be used to conduct research on the optimization of the model for the optimal execution of application services on mobile devices and the efficient distribution of edge resource workloads.

Synthesis of CuO/ZnO Nanoparticles and Their Application for Photocatalytic Degradation of Lidocaine HCl by the Trial-and-error and Taguchi Methods

  • Giahi, M.;Badalpoor, N.;Habibi, S.;Taghavi, H.
    • Bulletin of the Korean Chemical Society
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    • v.34 no.7
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    • pp.2176-2182
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    • 2013
  • A novel sol-gel method was implied to prepare CuO-doped ZnO nanoparticles. XRD and SEM techniques were used to characterize the CuO-doped ZnO sample. The photocatalytic degradation of Lidocaine HCl was investigated by two methods. The degradation was studied under different conditions such as the amount of photocatalyst, pH of the system, initial concentration, presence of electron acceptor, and presence of anions. The results showed that they strongly affected the photocatalytic degradation of Lidocaine HCl. The photodegradation efficiency of drug increased with the increase of the irradiation time. After 6 h irradiation with 400-W mercury lamp, about 93% removal of Lidocaine HCl was achieved. The degree of photodegradation obtained by Taguchi method compatible with the trial-and-error method showed reliable results.

Branch Algorithm for Phoneme Segmentation in Korean Speech Recognition System (한국어 음성인식 시스템에서 음소 경계 검출을 위한 Branch 알고리즘)

  • 서영완;한승진;장흥종;이정현
    • Proceedings of the Korean Information Science Society Conference
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    • 2000.04b
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    • pp.357-359
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    • 2000
  • 음소 단위로 구축된 음성 데이터는 음성인식, 합성 및 분석 등의 분야에서 매우 중요하다. 일반적으로 음소는 유성음과 무성음으로 구분되어 진다. 이러한 유성음과 무성음은 많은 특징적 차이가 있지만, 기존의 음소 경계추출 알고리즘은 이를 고려하지 않고 시간 축을 기준으로 이전 프레임과 매개변수 (스펙트럼) 비교만을 통하여 음소의 경계를 결정한다. 본 논문에서는 음소 경계 추출을 위하여 유성음과 무성음의 특징적 차이를 고려한 블록기반의 Branch 알고리즘을 설계하였다. Branch 알고리즘을 사용하기 위한 스펙트럼 비교 방법은 MFCC(Mel-Frequency Cepstrum Coefficient)를 기반으로 한 거리 측정법을 사용하였고, 유성음과 무성음의 구분은 포만트 주파수를 이용하였다. 실험 결과 3~4음절 고립단어를 대상으로 약 78%의 정확도를 얻을수 있었다.

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Analytical Models of Instruction Fetch on Superscalar Processors

  • Kim, Sun-Mo;Jung, Jin-Ha;Park, Sang-Bang
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.619-622
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    • 2000
  • This research presents an analytical model to predict the instruction fetch rate on superscalar Processors. The proposed model is also able to analyze the performance relationship between cache miss and branch prediction miss. The proposed model takes into account various kind of architectural parameters such as branch instruction probability, cache miss rate, branch prediction miss rate, and etc.. To prove the correctness of the proposed model, we performed extensive simulations and compared the results with those of the analytical models. Simulation results showed that the pro-posed model can estimate the instruction fetch rate accurately within 10% error in most cases. The model is also able to show the effects of the cache miss and branch prediction miss on the performance of instruction fetch rate, which can provide an valuable information in designing a balanced system.

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A Study on the External System Modeling Using Branch Outage Sensitivity (선로고장감도를 이용한 외부 전력계통 모델링 기법에 관한 연구)

  • Kim, Hong-Rae;Kwon, Hyung-Seok
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.325-327
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    • 2000
  • This paper addresses the issues of the external system modeling and power system state estimation with the external model. A set of significant branches is identified in the external system based on their branch outage sensitivities on the tie-lines. Measurements on these branches are transffered to internal system and updated in real-time. The state estimator is run for different loading conditions by using the actual measurements for the internal system and selected significant external system measurements while keeping the rest of the external system measurements at their base case values. Simulation results are presented using the IEEE 118 bus system as an example.

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