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Asymmetry-aware load balancing for parallel applications in single-ISA multi-core systems

Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第6期13卷 413-427页

作者： eunsung kim Hyeonsang EOM Heon Y. YEOM School of Computer Science and Engineering Seoul National University Seoul 151-744 Korea

Contemporary operating systems for single-ISA (instruction set architecture) multi-core systems attempt to distribute tasks equally among all the CPUs. This approach works relatively well when there is no difference in CPU capability. However, there are cases in which CPU capability differs from one another. For instance, static capability asymmetry results from the advent of new asymmetric hardware, and dynamic capability asymmetry comes from the operating system (OS) outside noise caused from networking or I/O handling. These asymmetries can make it hard for the OS scheduler to evenly distribute the tasks, resulting in less efficient load balancing. In this paper, we propose a user-level load balancer for parallel applications, called the 'capability balancer', which recognizes the difference of CPU capability and makes subtasks share the entire CPU capability fairly. The balancer can coexist with the existing kernel-level load balancer without detrimenting the behavior of the kernel balancer. The capability balancer can fairly distribute CPU capability to tasks with very little overhead. For real workloads like the NAS Parallel Benchmark (NPB), we have accomplished speedups of up to 9.8% and 8.5% in dynamic and static asymmetries, respectively. We have also experienced speedups of 13.3% for dynamic asymmetry and 24.1% for static asymmetry in a competitive environment. The impacts of our task selection policies, FIFO (first in, first out) and cache, were compared. The use of the cache policy led to a speedup of 5.3% in overall execution time and a decrease of 4.7% in the overall cache miss count, compared with the FIFO policy, which is used by default.

关键词：调度程序负担平衡能力不对称现象 OS 噪音多核心

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Heterogeneous Oxidation of Methylene Blue with Surface-Modified Iron-Amended Activated Carbon

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American Journal of Analytical Chemistry 2013年第7期4卷 115-122页

作者： Jihyun R. kim Branden Santiano Hyosang kim eunsung Kan Department of Molecular Bioscience and Bioengineering University of Hawaii at Manoa Honolulu USA

The present study aims to develop effective adsorption and oxidation of synthetic dye in wastewater by using the newly synthesized iron-amended activated carbon. Recently synthetic dye-containing wastewater has gained more attention due to its mass discharge, high toxicity and low biodegradation. For enhancing adsorption of dye and oxidative regeneration of dye-exhausted activated carbon, the novel amendment of iron-deposited granular activated carbon (GAC) was developed. It was to amend ferrous ion onto the acid-pretreated GAC when pH of iron solution was higher than the pH at point of zero charge (pH, pzc) of the GAC. Methylene blue (MB) in water was adsorbed onto the acid-treated iron- amended GAC (Fe-GAC) followed by single or multiple applications of H2O2. Batch experiments were carried out to study the adsorption isotherm and kinetics indicating adsorption of MB onto the Fe-GAC followed Langmuir isotherm and the pseudo-second order kinetics. The Fe-GACshowed the maximum adsorption capacity (qm) of 238.1 ± 0.78 mg/g which was higher than the virgin GAC with qm of 175.4 ± 13.6 mg/g at 20?C, pH 6 and the initial concentration of 20 - 200 mg/L. The heterogeneous Fenton oxidation of MB in the Fe-GAC revealedthat increasing the H2O2 loading from 7 to 140 mmol H2O2/mmol MB led to enhancing the oxidation efficiency of MB in the GAC from 62.6% to 100% due to the increased generation of hydroxyl radicals. Further enhancement of oxidation of MB in the Fe-GAC was made by the multiple application of H2O2 while minimizing OH radical scavenging often occurring at high concentration of H2O2. Therefore, the acid-treated iron-amended GAC would provide excellent adsorption capacity for MB and high oxidation efficiency of MB in the GAC with multiple applications of H2O2 and optimum iron loading.

关键词： Adsorption Activated Carbon Iron-Amended Activated Carbon Heterogeneous Oxidation Fenton Oxidation Methylene Blue

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Preoperative serum carbohydrate antigen 19-9 levels predict early recurrence after the resection of early-stage pancreatic ductal adenocarcinoma

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World Journal of Gastrointestinal Surgery 2021年第11期13卷 1423-1435页

作者： Sarang Hong Ki Byung Song Dae Wook Hwang Jae Hoon Lee Woohyung Lee eunsung Jun Jaewoo Kwon Yejong Park Seo Young Park Naru kim Dakyum Shin Hyeyeon kim Minkyu Sung Yunbeom Ryu Song Cheol kim Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryAsan Medical CenterSeoul 05505South Korea Department of Surgery Kangbuk Samsung HospitalSungkyunkwan University School of MedicineSeoul 03181South Korea Department of Statistics and Data Science Korea National Open UniversitySeoul 03087South Korea Department of Surgery Uijeongbu St.Mary's HospitalCollege of MedicineGyeonggido 11765South Korea

BACKGROUND Pancreatic ductal adenocarcinoma(PDAC)is a serious disease with a poor *** a minority of patients undergo surgery due to the advanced stage of the disease,and patients with early-stage disease,who are expected to have a better prognosis,often experience ***,it is important to identify the risk factors for early recurrence and to develop an adequate treatment *** To evaluate the predictive factors associated with the early recurrence of earlystage *** This study enrolled 407 patients with stage I PDAC undergoing upfront surgical resection between January 2000 and April *** recurrence was defined as a diagnosis of recurrence within 6 mo of *** optimal cutoff values were determined by receiver operating characteristic(ROC)*** and multivariate analyses were performed to identify the risk factors for early *** Of the 407 patients,98 patients(24.1%)experienced early disease recurrence:26(26.5%)local and 72(73.5%)distant *** total,253(62.2%)patients received adjuvant *** ROC curve analysis,the optimal cutoff values for early recurrence were 70 U/mL and 2.85 cm for carbohydrate antigen 19-9(CA 19-9)levels and tumor size,*** the 181 patients with CA 19-9 level>70 U/mL,59(32.6%)had early recurrence,compared to 39(17.4%)of 226 patients with CA 19-9 level≤70 U/mL(P70 U/mL(P=0.006),tumor size>2.85 cm(P=0.004),poor differentiation(P=0.008),and non-adjuvant chemotherapy(P=0.025)were significant risk factors for early recurrence in early-stage *** Elevated CA 19-9 level(cutoff value>70 U/mL)can be a reliable predictive factor for early recurrence in early-stage *** adjuvant chemotherapy can prevent early recurrence,it should be recommended for patients susceptible to early recurrence.

关键词： Pancreatic ductal adenocarcinoma Early recurrence Upfront surgery Carbohydrate antigen 19-9 Adjuvant chemotherapy

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乐高,在系统中建立创意

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艺术与设计 2023年第7期1卷 118-123页

作者：金真希朴恩星尹美妍(图) 郑佑荣(图) 信勋(图) 刘祖龙(翻译) 不详

在所有砖块的大小和颜色都相同的前提下,六块乐高砖能够创造出多达915103765种组合,两块乐高砖就可以创造出24种不同的组合。换句话说,不同尺寸和颜色的砖块在创造变化方面几乎没有限制。乐高砖块的生产量如今已经达到人均八十块。从193... 详细信息

在所有砖块的大小和颜色都相同的前提下,六块乐高砖能够创造出多达915103765种组合,两块乐高砖就可以创造出24种不同的组合。换句话说,不同尺寸和颜色的砖块在创造变化方面几乎没有限制。乐高砖块的生产量如今已经达到人均八十块。从1932年创立至今,在近百年的时间里,乐高已经成为全球最畅销的玩具大王。

关键词：乐高砖块不同尺寸生产量近百年颜色

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Instagram:创意创造成功

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艺术与设计 2023年第6期282卷 120-123页

作者：金真希朴恩星尹美妍(图) 郑佑荣(图) 信勋(图) 刘祖龙(翻译) 不详

一对夫妇在墨西哥的海滩上散步。妻子说:“我不想拍照,因为我的照片看起来不怎么样,不如你另一个朋友分享的照片好看?”丈夫告诉她,那是因为那位朋友使用了滤镜。然后妻子她说:“既然你这么了解,那你之前肯定有滤镜。”这对夫妇是Instag... 详细信息

一对夫妇在墨西哥的海滩上散步。妻子说:“我不想拍照,因为我的照片看起来不怎么样,不如你另一个朋友分享的照片好看?”丈夫告诉她,那是因为那位朋友使用了滤镜。然后妻子她说:“既然你这么了解,那你之前肯定有滤镜。”这对夫妇是Instagram的首席执行官凯文·西斯特罗姆(KevinSystrom),以及他当时的女友、现在的妻子妮可·舒茨(Nicole Schuetz)。那个滤镜就是X-ProII,Instagram的第一个滤镜。

关键词：滤镜首席执行官照片

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