http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Prospects of African Integration in Light of the Theory of Optimum Currency Areas
( Julius Horvath ),( Richard Grabowski ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 1997 Journal of Economic Integration Vol.12 No.1
This paper empirically addresses the question of the prospects of integration among African states in light of Mundell`s theory of optimum currency areas. The symmetry and asymmetry of shocks affecting African countries is measured by a structural vector autoregression decomposition method developed by Blanchard and Quah [1989] and Bayoumi and Eichengreen [1992]. The results indicate that the scope for such integration is quite limited. Asymmetry of supply shocks prevails throughout Africa and especially in its Eastern part. On the other hand, we found that there are groups of countries in Northern Africa, Western Africa and Southern Africa which share symmetric demand shocks. (JEL Classification: F36, O55)
Julius Marvin Flores,Carlo Elipse,Hyun Jong Lee,Kideok Kim 한국도로학회 2018 한국도로학회 학술대회 발표논문 초록집 Vol.2018 No.05
Pavement performance usually depends on the pavement’s material property, traffic and environmental conditions. Current pavement design programs such as the Mechanistic Empirical Pavement Design Guide use these factors in assessing the pavement life and performance in terms of different distresses like rutting and fatigue cracking. Theoretically, the cracking and rutting behaviour of pavements are based on accumulated strains experienced by the pavement which is brought by the weight and loading speed of vehicles. A steady state loading device was used in the field to evaluate pavement deflection’s behaviour in varying loading frequencies. It was observed that the pavement deflection increases as the loading frequency also increases until it approaches a certain frequency wherein the deflection decreases thereafter. In this study, a three-dimensional finite element pavement model was established using ABAQUS wherein the effect of the vehicle’s loading frequencies was analysed. The calculated static deflection and stress from the finite element (FE) model were found to have good correlation with the KENPAVE measured deflection and stress. The deflections of different pavement conditions were further studied and analysed by generating several pavement geometries and strength from the FE model using a frequency sweep response analysis. It was found that the geometric condition and the current modulus of the pavement can amplify the pavement deflection by a factor, β, depending on the loading frequency. The peak deflection was found to be occurring when the loading frequency approaches one of the pavement’s natural frequencies. Based on the finding from this study, the natural frequency is an important factor to be considered in designing pavements. Further study is recommended to understand more on how to minimize the effect of natural frequency to pavement life.
GFDM Frame Design for Low-latency Industrial Networks
Julius Ssimbwa,임병주,고영채 한국통신학회 2022 Journal of communications and networks Vol.24 No.3
This paper proposes a short packet GFDM-basedphysical (PHY) layer for industrial wireless networks to reducelatency. In our proposed PHY layer, the conventional OFDMscheme used in the data field of IEEE 802.11 WLAN standardsis replaced by GFDM. The preamble size is also reduced from 10symbols to 1 symbol. Furthermore, the fields of the overall packetstructure are optimized in terms of total number of subcarriersand cyclic prefix length. Additionally, a noise-free GFDM schemeis subjected to concatenated channel coding to minimize errorrate. Through simulation, packet transmission time is reducedby about 40 ∼ 72% compared to the OFDM-based PHY layerwhile achieving a PER of order 10−3. The obtained results showthat the GFDM-based PHY layer outperforms its counterpart byexhibiting a lower latency and high reliability. This performancerenders the GFDM-based (proposed) PHY layer suitable foradoption in the development of wireless networks for latencyand reliability constrained industrial applications. It should benoted that the simulations presented in this paper express ourfirst step in the direction of using GFDM for industrial wirelessnetworks to achieve low latency and high reliability. We thereforeconsider building a fully functional GFDM based-testbed as partof our future work.
A new fitness function for tuning parameters of Peripheral Integral Derivative Controllers
Julius Beneoluchi Odili,A. Noraziah,Asegunloluwa Eunice Babalola 한국통신학회 2022 ICT Express Vol.8 No.3
In recent years, the need for greater effectiveness and efficiency in industrial processes and procedures has made control system engineering a favored area of scientific investigation, especially the proper tuning of the parameters of Peripheral Integral Derivative (PID) Controllers. This paper critically examines some issues with the present fitness functions being used by different researchers involved in metaheuristic tuning of PID Controllers. It concludes with the introduction of a fitness function called the Inverse Integrated Squared Absolute Error whose experimental outcome using the African Buffalo Optimization algorithm was able to obtain zero (0) steady state error, zero (0) overshoot, 1.77 s rise time and 2.87 s steady time which is quite competitive. The paper opines that further appropriate investigations of the metaheuristic tuning of PID Controllers using this latest fitness function are highly recommended since it is very simple to both implement and use.
Current Approaches to the Treatment of Post-Stroke Aphasia
Julius Fridriksson,Argye Elizabeth Hillis 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.2
Aphasia, impairment of language after stroke or other neurological insult, is a common and often devastating condition that affects nearly every social activity and interaction. Behavioral speech and language therapy is the mainstay of treatment, although other interventions have been introduced to augment the effects of the behavioral therapy. In this narrative review, we discuss advances in aphasia therapy in the last 5 years and focus primarily on properly powered, randomized, controlled trials of both behavioral therapies and interventions to augment therapy for post-stroke aphasia. These trials include evaluation of behavioral therapies and computer-delivered language therapies. We also discuss outcome prediction trials as well as interventional trials that have employed noninvasive brain stimulation, or medications to augment language therapy. Supported by evidence from Phase III trials and large meta-analyses, it is now generally accepted that aphasia therapy can improve language processing for many patients. Not all patients respond similarly to aphasia therapy with the most severe patients being the least likely responders. Nevertheless, it is imperative that all patients, regardless of severity, receive aphasia management focused on direct therapy of language deficits, counseling, or both. Emerging evidence from Phase II trials suggests transcranial brain stimulation is a promising method to boost aphasia therapy outcomes.