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Structure, Alpha and Beta Diversity of Natural Forest Areas in Eco-Zones of Taraba State, Nigeria
Dau Henry Japheth,Bunde Bernard Meer 강원대학교 산림과학연구소 2023 Journal of Forest Science Vol.39 No.1
To understand the health conditions and growth patterns of forest estate for environmental resilience and climate change mitigation, assessment of structure and species diversity is paramount. This study aimed at assessing the structure, alpha, and beta diversities of tree species in three ecological zones in Taraba, Nigeria for management purposes. In recent time, no research has been reported on the structure and beta diversity of the study areas. A systematic sampling design was used for data collection. Five sample plots of 50×50 m were laid in each of the six natural forest areas. The result showed a mean DBH (42.5 cm) and a tree height (15.0 m) from the forests. The forests have a structure of an inverse “J-shape,” which is typical of natural forests in the tropics. The southern Guinea savanna zone had the highest mean Shannon-Weiner diversity index (2.8). The least beta diversity index (0.02) was between Baissa and Jen Gininya forest areas. Baissa and Bakin Dutse Protected Forest Areas (PFAs) contained 76.5% of the tree species. There is a high chance of all tree species to be found in these 2 forest areas. Proximity to a location influences how similar two tree species are, according to the least beta diversity index (0.02) recorded. The Federal Government’s method of management for the forest, known as Gashaka Gumti National Park, may be responsible for the high beta diversity index in the Montane ecozone. Therefore, it should be strongly encouraged to practice strict oversight of natural areas, as their contributions to reducing climate change in Taraba State, Nigeria, cannot be overstated.
Dau, Pham Thi,Sakai, Hiroki,Hirano, Masashi,Ishibashi, Hiroshi,Tanaka, Yuki,Kameda, Kenji,Fujino, Takahiro,Kim, Eun-Young,Iwata, Hisato Academic Press 2013 Toxicological sciences Vol.131 No.1
<P>The constitutive androstane receptor (CAR) not only displays a high basal transcriptional activity but also acts as a ligand-dependent transcriptional factor. It is known that CAR exhibits different ligand profiles across species. However, the mechanisms underlying CAR activation by chemicals and the species-specific responses are not fully understood. The objectives of this study are to establish a high-throughput tool to screen CAR ligands and to clarify how CAR proteins from the Baikal seal (bsCAR) and the mouse (mCAR) interact with chemicals and steroid receptor coactivator 1 (SRC1). We developed the surface plasmon resonance (SPR) system to assess quantitatively the interaction of CAR with potential ligands and SRC1. The ligand-binding domain (LBD) of bsCAR and mCAR was synthesized in a wheat germ cell-free system. The purified CAR LBD was then immobilized on the sensor chip for the SPR assay, and the kinetics of direct interaction of CARs with ligand candidates was measured. Androstanol and androstenol, estrone, 17β-estradiol, TCPOBOP, and CITCO showed compound-specific but similar affinities for both CARs. The CAR-SRC1 interaction was ligand dependent but exhibited a different ligand profile between the seal and the mouse. The results of SRC1 interaction assay accounted for those of our previous in vitro CAR-mediated transactivation assay. In silico analyses also supported the results of CAR-SRC1 interaction; there is little structural difference in the ligand-binding pocket of bsCAR and mCAR, but there is a distinct discrimination in the helix 11 and 12 of these receptors, suggesting that the interaction of ligand-bound CAR and SRC1 is critical for determining species-specific and ligand-dependent transactivation over the basal activity. The SPR assays demonstrated a potential as a high-throughput screening tool of CAR ligands.</P>
The Doctrine of Exclusive Representation in the United States
Kenneth Glenn Dau-Schmidt,Ryan Hamilton Vann 한국고용노사관계학회 2006 産業關係硏究 Vol.16 No.1
The question of whether to determine employee representation through exclusive representation or plural unionism is a one that touches on the fundamental issues of equity in bargaining power and promoting industrial peace in the development of a system of industrial relations. In this essay we examine the policy choice between a system of industrial relations based on exclusive representation and one based on plural unionism. We undertake this examination by presenting the American law and experience with respect to exclusive representation, and discussing the relevance of that experience to the question of plural unionism in the Republic of Korea.
Lifetime estimation of harmonic reducer for manufacturing robot using accelerated life test
Joo-Hong Lee,You-Hee Cho,Dau-Sik Kim,Jong-Won Park 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
We present a calibrated accelerated life test to predict the operational lifetime of newly manufactured harmonic reducers for robots. To this end, a framework based on torque as the accelerating stress is proposed, and a step-stress test is performed to determine the highest stress level. Furthermore, the failure mode and corresponding failure mechanisms of the primary components of the harmonic reducer, and the effect of stress due to the applied load are analyzed. Accordingly, the lifetime of the harmonic reducer under its rated condition is estimated by extrapolating the acceleration test data at three stress levels and analyzing the same using statistical methods. The results obtained include such measures of reliability as the shape and scale parameters of the Weibull distribution, acceleration index for torque, and various estimates of the harmonic reducer’s lifetime.
Influence of Corporate Governance on Dividend Policy in Vietnam
NGUYEN, Ha Viet,DANG, Hung Ngoc,DAU, Hung Hoang Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.2
The paper examines the impact of corporate governance (CG), on dividend policy (DP) of enterprises in Vietnam. The paper studies the impact of CG on DP of businesses listed on Vietnam's stock exchange in the period 2008-2018 with 2,937 observations. The data of these companies is collected from the financial statements of businesses and Vietstock data sets, as well as aggregated from the data published on some reputable securities websites. The study used GLS regression method for data collected at listed companies in Vietnam in the period of 2008-2018. The research results have found that CG, the chairman of the board of directors (BOD), and the managing director have a negative effect on the DP. Specifically, companies with strong BODs tend to pay low dividends. At the same time, research shows that factors such as profitability, financial leverage, firm size, and investment opportunities affect DP. This result underscores the importance of corporate governance (both internal and external) to the income distribution decision and provides policy implications for investors and company executives. The study finds solid evidence that alternative theory explains better the relationship between corporate governance and dividend policy. Accordingly, companies with weak corporate governance will pay more dividends.
Deep learning-based smith predictor design for a remote grasping control system
김동언,Ailing Li,Mai-Ngoc Dau,Hyun Hee Kim,Wan-Young Chung 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
In this study, a robotic hand control system was designed based on data gloves, aiming to provide more intuitive control and improved operational performance for a remote robotic hand. Compensation measures were proposed for the time lag effect on the remotecontrol system to address the input and feedback time delays of the remote robot system. A Smith predictor structure was modified by replacing the linear estimator with a recurrent neural network. A convolutional neural network was applied to the long short-term memory (LSTM) model, as it had a better convergence time and learning performance than the multi-layer perceptron model during training. The experimental results demonstrate that the control effect of this scheme is approximately 0.5 s faster than the normal Smith predictive control, proving its effectiveness.