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Empirical Analysis of Disaggregated Cloud Memory on Memory Intensive Applications
Yeonwoo Jeong,Gyeonghwan Jung,Kyuli Park,Youngjae Kim,Sungyong Park 대한전자공학회 2023 Journal of semiconductor technology and science Vol.23 No.5
Disaggregated Cloud Memory (DCM) is a hypervisor-based solution that allows client node to extend local memory by leveraging underutilized memory from remote node. These two nodes are generally connected through Remote Direct Memory Access (RDMA)-based high-bandwidth InfiniBand networks. DCM has been a viable alternative to mitigate the performance degradation of memory-intensive applications in memory-constrained environments. There has also been a growing interest in developing memory-intensive applications with managed languages (we call managed applications) such as Java and Python. These managed languages are easy to use but introduce unpredictability in memory usage at runtime. Despite the advantage of memory extension in DCM, the empirical studies that analyze the performance impact and overhead of running managed applications in DCM are lacking. This paper presents the results of a comprehensive study of DCM on both managed and unmanaged applications. The experimental results revealed that the performance degradation of unmanaged applications in DCM is only less than 6% due to fast remote paging and optimized page eviction policy. However, Garbage Collection (GC) severely degrades the performance of managed applications when page fault occurs, while DCM mitigates the performance degradation efficiently.
스마트폰 중독 잠재위험군의 어깨 기울기, 목 관절가동범위 및 주관적 통증 정도의 상관관계
정연우 ( Jeong Yeonwoo ) 대한통합의학회 2017 대한통합의학회지 Vol.5 No.2
Purpose : The purpose of this study was to investigate the correlation between shoulder gradient, range of motion of the neck, and subjective pain level of the potential risk group of smart-phone addiction. Methods : The subjects of this study were 90 women`s who had potential risk of smart-phone addiction. VAS was used to measure subjectively pain intensity. Global Postural System was used to measure forward head posture. CROM was used to measure flexion, extension, lateral flexion of cervical range of motion. Results : The results of this study showed that was significant positive correlation between the both shoulder gradient, and cervical range of motion(p<.05). Statistically significant negative correlation between the VAS and left lateral flexion(p<.05). Conclusions : The difference between the gradient of both shoulders increased with the use of smart-phone addiction, and the cervical left lateral flexion decreased as the pain increased. This suggests that recognition on decrease of using smart phone and postural correction is necessary.
교각운동이 월경곤란증으로 인한 허리통증을 가진 여대생에게 미치는 영향
정연우 ( Jeong Yeonwoo ),홍상현 ( Hong Sanghyeon ),이승협 ( Lee Seunghyub ) 대한통합의학회 2016 대한통합의학회지 Vol.4 No.4
Purpose : This study determines the effect and sustainability of the trunk stability exercise program, specifically using the bridge exercise, by measuring Visual Analogue Scale(VAS), Menstrual Distress Questionaire(MDQ) and muscle strength in women university students complaining of low back pain. Methods : The trunk stability exercise program was progressed by 22 women university students, for 4 weeks, (3 times a week, 1 hour per session). At this time, low back pain happened at the period of menstruation and was measured using VAS, Dysmenorrhea using the MDQ tool and abdominal and back muscle strength using HUR. This study was evaluated 4 times (before and after the exercise program, after 4 weeks and 8 weeks) to investigate the effect of time variation after the exercise program. Results : The trends showed a decrease in VAS and MDQ and an increase in abdominal and back muscle strength. Therefore, these results were evaluated positively from a statistical perspective(p<.05). Conclusions : The trunk stability exercise results in a decreased VAS and MDQ, and increases the muscle strength in women university students who complained of low back pain form dysmenorrhea. Therefore, the low back pain from dysmenorrhea could have been avoided and quality of everyday life improved.
정연우(Jeong Yeonwoo) 한국슬라브유라시아학회 2008 슬라브학보 Vol.23 No.3
Based on the grammaticalization theory suggesting that the grammatical morphemes are developed gradually out of lexical morphemes, this article maintains that the diverse Russian modal auxiliaries(modals) not only have been developed or changed in meaning out of lexical items, but also have been gradually shifted to grammat icalstatus, although the stages of the development differs according to the perspectives. Russian modal meanings are expressed by various morphological, syntactic, and lexical categories. While in English and German the modals have specific morpho-syntactic properties and are well established in grammar, in Russian the category of modals is not an established notion and is treated as a lexical phenomenon. It means that the modal system of Russian is not grammaticalized as the Germanic system is. Russian modals exhibit diverse morphological and syntactic manifestations. Russian modal auxiliaries, which are served as predicates in sentence and can be combined with a main verb, can take the forms of verbs, adjectives or adverbs. Personal modals require a subject in the nominative, while impersonal modals require a subject in the dative. Thus, they do not form a closed set and can only be determined by being located on a grammaticalization chain extending from content words with a lexical meaning to function words with a grammatical meaning. In this way, auxiliation can be understood as a partial phenomenon from lexical-syntactic expressions to free-grammatical expressions of a concept. This article tries to examine through the five mechanisms of semantic change, proposed by Bybee et al.(1994); metaphorical extension, inference or the conventionalization of implicature, generalization, harmony, and absorption of contextual meaning. Among the modals only dol?en and mo?’ can express epistemic modality owing to metaphorical extension. The motion verb idti/xodit’ alone could not proceed from spatial meaning to modal auxiliary's meaning, but with the suffix -sja through metonymic inference. The modal predicates dol en and nel’zja lost specific features of meaning and thus show generalization in meaning and specialization in function. Having examined the mechanisms of grammaticalization, this article compiles the results of stages in the following table. 〈표 삽입〉 In conclusion, with the grammaticalization theory we could not only categorize the modal auxiliary system more insightfully, but also explain why these modals are so different from English and German counterparts. The modal system of Russian is not as grammaticalized as these counterparts, but the development of modals in Russian shows very interesting gradual transitional evolution from a lexical status into more or less grammatical status as well as the interference phenomena with diverse levels and types of grammaticality.