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A Reconfigurable Processor Infrastructure for Accelerating Java Applications
HAN, Youngsun,HWANG, Seok Joong,KIM, Seon Wook The Institute of Electronics, Information and Comm 2008 IEICE transactions on fundamentals of electronics, Vol.91 No.8
<P>In this paper, we present a reconfigurable processor infrastructure to accelerate Java applications, called Jaguar. The Jaguar infrastructure consists of a compiler framework and a runtime environment support. The compiler framework selects a group of Java methods to be translated into hardware for delivering the best performance under limited resources, and translates the selected Java methods into Verilog synthesizable code modules. The runtime environment support includes the Java virtual machine (JVM) running on a host processor to provide Java execution environment to the generated Java accelerator through communication interface units while preserving Java semantics. Our compiler infrastructure is a tightly integrated and solid compiler-aided solution for Java reconfigurable computing. There is no limitation in generating synthesizable Verilog modules from any Java application while preserving Java semantics. In terms of performance, our infrastructure achieves the speedup by 5.4 times on average and by up to 9.4 times in measured benchmarks with respect to JVM-only execution. Furthermore, two optimization schemes such as an instruction folding and a live buffer removal can reduce 24% on average and up to 39% of the resource consumption.</P>
Bolus Transition During Oropharyngeal Swallowing after Unilateral Cortical Stroke
Hyeju Han,Taeok Park,Byung-Mo Oh,Han Gil Seo,Youngsun Kim 한국언어재활사협회 2018 Clinical Archives of Communication Disorders Vol.3 No.3
Purpose: Bolus transition during swallowing represents neuromuscular coordination between oropharyngeal structures and bolus movement. The purpose of this study was to examine the difference between stroke patients with left and right hemisphere lesion in terms of oral and pharyngeal transitions using oral transit time (OTT), pharyngeal transit time (PTT), and duration of upper esophageal sphincter opening (DUESO) during swallowing. Methods: Thirty-four unilateral cortical stroke patients were divided into two groups depending on the hemispheric site of the lesion. Means and standard deviations of OTT, PTT, and DUESO were measured on 2 mL and 5 mL of thin liquid swallows from videofluoroscopic swallowing examinations (VFSEs). Statistical comparison was performed by repeated measurements of analysis of variance (ANOVA). Significance level was set at <0.025. Results: In OTT, PTT, and DUESO, there was no significant difference between left and right hemispheric stroke groups. There was a significant bolus volume effect on OTT and DUESO. Conclusions: The site of the lesion may not affect the transition of bolus during oropharyngeal swallowing. Clinicians should not only examine physiological swallowing disorders of individual patients regardless of hemispheric site of the lesion, but also investigate various volumes during VFSEs in order to find the proper diet recommendation.
Bit Flip Reduction Schemes to Improve PCM Lifetime
Miseon Han,Youngsun Han 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.5
Recently, as the number of cores in computer systems has increased, the need for larger memory capacity has also increased. Unfortunately, dynamic random access memory (DRAM), popularly used as main memory for decades, now faces a scalability limitation. Phase change memory (PCM) is considered one of the strong alternatives to DRAM due to its advantages, such as high scalability, non-volatility, low idle power, and so on. However, since PCM suffers from short write endurance, direct use of PCM in main memory incurs a significant problem due to its short lifetime. To solve the lifetime limitation, many studies have focused on reducing the number of bit flips per write request. In this paper, we describe the PCM operating principles in detail and explore various bit flip reduction schemes. Also, we compare their performance in terms of bit reduction rate and lifetime improvement.
한영선(Youngsun Han),박인호(Inho Park),황석중(Seokjoong Hwang),김선욱(Seon Wook Kim) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅲ
Java's performance is sometimes not acceptable due to interpretation overhead by the Java Virtual Machine(JVM). In this paper, we present a compiler structure of Java-to-C translator for high performance on resource limited environment like mobile devices. Our compiler framework translates Java into C codes to preserve Java's programming semantics such as inheritance, method overloading, virtual method invocation, and so on. Also Our compiler fully supports Connected Limited Device Configuration (CLDC) 1.0 API's. We show that our compiler improves the speedup by up to eleven times more than JVM-only execution in measured benchmarks.
Write Disturbance Error-reduction Schemes
Miseon Han,Youngsun Han 대한전자공학회 2018 IEIE Transactions on Smart Processing & Computing Vol.7 No.2
As computer systems move to multi-core environments, applications consume a tremendous amount of data, and thus, the need for huge amounts of memory increases. To meet that need, dynamic random-access memory (DRAM), mostly used for main memory, has scaled up using more-developed technology. However, as the DRAM cell gets smaller due to the technology, it only holds a small charge, and needs frequent refresh operations. Therefore, DRAM faces a scaling limitation due to the refresh power needed, and thus phase-change memory (PCM) is emerging as a replacement for DRAM due to its advantages, such as high scalability, low idle power, and so on. However, if the PCM cell is smaller than 20㎚, PCM faces a non-negligible write disturbance problem, and thus, a solution to mitigate write disturbance errors is required for PCM memory. In this paper, we describe write disturbance and why it occurs, and then, we explore various write disturbance error-reduction schemes in detail.
Temporal Characteristics of Oropharyngeal Swallowing in Young Children with Dysphagia
Han Yunju,Kim Youngsun,Yi You Gyoung,Oh Byung-Mo 대한연하장애학회 2024 대한연하장애학회지 Vol.14 No.1
Objective: Aspiration is a major concern for children with dysphagia because aspiration has been known as the primary etiology leading to recurrent pneumonia, and severe impairment of lung function in pediatric populations. This study aimed to examine the differences in each temporal measure between children with and without aspiration and investigate the effect of bolus consistency on the temporal measures. Methods: Forty-two children ranging in age from 1 year to 3 years and 11 months were included in this study. A referral for a videofluoroscopic swallowing study (VFSS) was made. They were divided into two groups according to the presence or absence of aspiration. Sixteen children were aspirators, and twenty-six children were non-aspirators. Oropharyngeal temporal measures were analyzed using frame-by-frame analysis. Results: The delayed initiation of pharyngeal swallowing, delayed laryngeal closure, and poor bolus transition in the pharyngeal stage were associated with the risk of aspiration in children with dysphagia. The bolus consistency did not affect the oropharyngeal temporal measures. Conclusion: The objective temporal data in this study, including the durations and onset of physiological events in relation to bolus movement, can be used for future research to compare the swallowing functions between groups of children with various etiologies and age ranges.
Hyeju Han,Gayoung Shin,Ahyoung Jun,Taeok Park,Do-heungKo,Eunhee Choi,Youngsun Kim 대한재활의학회 2016 Annals of Rehabilitation Medicine Vol.40 No.1
Objective To examine the relation between the presence of penetration or aspiration and the occurrence of the clinical indicators of dysphagia. The presence of penetration or aspiration is closely related to the clinical indicators of dysphagia. It is essential to understand these relationships in order to implement proper diagnosis and treatment of dysphagia. Methods Fifty-eight poststroke survivors were divided into two groups: patients with or without penetration or aspiration. Medical records and videofluoroscopic swallowing examinations were reviewed. The occurrence of clinical indicators of dysphagia between two groups was analyzed with Cross Tabulation and the Pearson chi-square test (p<0.05).Results Poststroke survivors with penetration or aspiration had significantly high occurrences of delayed initiation of the swallow (p=0.04) and reduced hyolaryngeal elevation (p<0.01) than those without penetration or aspiration.Conclusion The results of this study indicate that delayed initiation of the swallow is a strong physiological indicator of penetration or aspiration during the oral stage of swallowing in poststroke survivors. For the pharyngeal stage of swallowing, hyoid and laryngeal elevation is a key event related to occurrence of penetration or aspiration. Clinical indicators should be investigated further to allow appropriate implementation of treatment strategies for stroke survivors.
소셜 네트워크에서 프리겔 기반의 효율적인 링크 예측 기법.
윤영선 ( Youngsun Yun ),홍지혜 ( Jihye Hong ),한용구 ( Yongkoo Han ),이영구 ( Young-koo Lee ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
링크 예측 기법은 소셜 네트워크 분석 중 한 방법으로서 그래프 내에서 추가적으로 발생하는 링크를 어떻게 예측하여 네트워크에 추가하는 가에 대한 문제이며 소셜 네트워크의 친구 추천 서비스, 상관 관계 분석, 테러리스트 네트워크 모니터링 등 여러 분야에서 사용되고 있다. 그러나 데이터가 대용량화 됨에 따라 모든 데이터를 메모리에 적재하지 못하거나 최단경로 알고리즘의 반복 수행 등 많은 수행시간을 요구하기 때문에 분산 처리 환경이 필요하게 되었다. 본 논문에서는 프리겔 기반의 모든 노드들 간의 최단경로를 찾는 알고리즘의 반복 수행을 제거하여 수행속도를 향상시킨다. 다양한 데이터셋에 따른 수행 시간을 측정하여 제안하는 기법의 우수성을 보인다.