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      • 北漢山의 植物資源調査硏究 : 第1部 管束植物 Resources in Mt. Buk-Han PartⅠTracheophyta

        鄭台鉉,李愚喆 成均館大學校 1962 論文集 Vol.7 No.-

        Mt. Buk-han is located in the northern side of Seoul, Korea; whose flara has been seriously destroyed due to the population increase of the city the constant Mountain climbers. The Plants of this mountain were first collected by Gotlsche, C. in 1883 when he collecetd plants in the entire vicinity of Seoul, and the flora of this mountain has been partly surveyed by several scholars, but no one has ever comprehensively surveyed the flora of this mountain as such. The writers is now presenting the results of their 9 times survey made from 1961 to 1962 as a part I of the entire flora specified as Tracheophyta. The result of this study is as follows: 1) The plants of Mt. Buk-han are composed of 114 families, 228 genera, 347 species, 94 varieties, 9 forma and 450 kind in all. 2) As the population of Seoul City has increased and their footprints got frequent, a disorder of the original flora of this mountain has occurred; Buxus Koreana, Utricularia bifida, Lactuca chelidonifolia, Sasamorpha purpurascens var. borealis have been disappeared consequently. 3) Comparing the flora of Mt. Buk-han with that of other mountains, 262 species were in common with Mt. Hanla (Ir. Querpart), 142 species are with Ir. Dagelet (Ulneung), 226 species with Mt. Sulak, and 18 species with Mt. Baek-doo. These facts show that the sothern floral elements such as Cocculus trilobus, Akebia quinata, Achgranthes japonica, Zelkova serrata, Viburnum erosum var. punctatum are believed to thrive in Mt. Buk-han which is in accord with northern line of temperate zone T. Nakai had named by means of climate of Korea.

      • KCI등재

        Developing a Green Route Model for Dry Port Selection in Vietnam

        Hoang Thai Pham,이향숙 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.2

        The dry port can smooth the movement of cargo and eliminate capacity pressure, natural restriction and externalities faced by seaports. A network of dry ports also can reduce the amount of pollution emitted from logistics activities by allowing the increasing share of environmentally friendly modes of transport. The paper suggests a green routing model for dry port selection to increases the percentage of using rail or inland waterway transportation in the journey through dry port, instead of road transportation. This model reduces the amount of emission from logistics activities, such as carbon dioxide (CO2), nitric oxides (NOx) and particulate matter (PM) with the minimum cost, considering both the emission charge and the shipping charge. A case study is conducted for Samsung Thai Nguyen factory in the North of Vietnam to validate the model application. The results indicate that the smallest total cost route saves up to 51% of CO2 and 36.5% of PM emission exhausted than unimodal road transportation. The research provides a useful guideline for new green transport policies of public agents as well as decision-making processes in private companies.

      • KCI등재

        Temporal and spatial outlier detection in wireless sensor networks

        Hoc Thai Nguyen,Nguyen Huu Thai 한국전자통신연구원 2019 ETRI Journal Vol.41 No.4

        Outlier detection techniques play an important role in enhancing the reliability of data communication in wireless sensor networks (WSNs). Considering the importance of outlier detection in WSNs, many outlier detection techniques have been proposed. Unfortunately, most of these techniques still have some potential limitations, that is, (a) high rate of false positives, (b) high time complexity, and (c) failure to detect outliers online. Moreover, these approaches mainly focus on either temporal outliers or spatial outliers. Therefore, this paper aims to introduce novel algorithms that successfully detect both temporal outliers and spatial outliers. Our contributions are twofold: (i) modifying the Hampel Identifier (HI) algorithm to achieve high accuracy identification rate in temporal outlier detection, (ii) combining the Gaussian process (GP) model and graph‐based outlier detection technique to improve the performance of the algorithm in spatial outlier detection. The results demonstrate that our techniques outperform the state‐of‐the‐art methods in terms of accuracy and work well with various data types.

      • SCISCIESCOPUSKCI등재

        Temporal and spatial outlier detection in wireless sensor networks

        Nguyen, Hoc Thai,Thai, Nguyen Huu Electronics and Telecommunications Research Instit 2019 ETRI Journal Vol.41 No.4

        Outlier detection techniques play an important role in enhancing the reliability of data communication in wireless sensor networks (WSNs). Considering the importance of outlier detection in WSNs, many outlier detection techniques have been proposed. Unfortunately, most of these techniques still have some potential limitations, that is, (a) high rate of false positives, (b) high time complexity, and (c) failure to detect outliers online. Moreover, these approaches mainly focus on either temporal outliers or spatial outliers. Therefore, this paper aims to introduce novel algorithms that successfully detect both temporal outliers and spatial outliers. Our contributions are twofold: (i) modifying the Hampel Identifier (HI) algorithm to achieve high accuracy identification rate in temporal outlier detection, (ii) combining the Gaussian process (GP) model and graph-based outlier detection technique to improve the performance of the algorithm in spatial outlier detection. The results demonstrate that our techniques outperform the state-of-the-art methods in terms of accuracy and work well with various data types.

      • Safety assessment of an underground tunnel subjected to missile impact using numerical simulations

        Duc-Kien Thai,Duy-Liem Nguyen,Thanh-Tung Pham,Thai-Hoan Pham 사단법인 한국계산역학회 2021 Computers and Concrete, An International Journal Vol.27 No.1

        This work presents a safety assessment of an underground tunnel subjected to a ballistic missile attack employing the numerical approach. For the impact simulation, a box shaped reinforced concrete (RC) structure with a cross section dimension of 8.0×10.0 m under a soil layer that was attacked by a SCUD missile was modeled using finite element (FE) software LS-DYNA. SCUD missile is one of a series of tactical ballistic missiles developed by Soviet Union during the Cold War, which is adopted for a short-range ballistic missile. The developed FE simulation for the penetration depth of the missile impacting into the soil structure was verified from the well-known formula of the penetration prediction. The soil-structure interaction, the soil type, and the impact missile velocity effects on the penetration depth of the missile into the different soil types were investigated. The safety assessment of the underground tunnel was performed with regard to the different depths of the underground tunnel. For each missile velocity and soil type, a specific depth called the unsafe depth was obtained from the analysis results. The structure beneath the soil beyond this depth remains safe. The unsafe depth was found to be increased with the increasing missile velocity.

      • KCI등재

        The Influence of Responsibility Shift on Warehousing Performance: The Case of Australia

        Vinh V. THAI,Vinh V. THAI,Zaheed HALIM 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.1

        Although there have been extensive efforts to eliminate the use of warehousing due to its large requirement of resources, the need to connect manufacturing with end consumers will be difficult to coordinate without it. In Australia, the rapid advance of warehousing has facilitated the challenging demands of customers. In the literature, the challenges of increasing reliability, space utilisation, and reducing waste have been managed through improved warehousing processes and technology; however, the important role of employees through responsibility shift in enhancing warehousing performance has not yet been fully explored. This study therefore examines the relationship between the employment of Responsibility Shift (RS) and Warehousing Performance (WP) in Australia within the processes of Inbounding and Storage through the usage of a survey conducted with department supervisors and managers of warehousing companies which were members of the Chartered Institute of Logistics and Transport in Australia (CILTA) and Supply Chain and Logistics Association of Australia (SCLAA). It was found that RS positively causes a statistically significant influence on warehousing performance. This research contributes to enrich the literature on RS as it is perhaps the first study which examines the effects of RS on warehousing performance in Australia while also enables warehousing managers to explore ways to improve warehousing performance from the human resource management perspective. Although being significant both in terms of managerial and academic implications, the generalizability of this research is limited from a small sample size. Future research, therefore, needs to look into a wider population as well as further investigation into the effects of Responsibility Shift in the rapidly developing warehousing business environment elsewhere in the world.

      • KCI등재

        Compact Wideband Internal Antenna Using Epsilon Negative Zeroth‑Order Resonator With CPWG‑Fed for UHD‑TV Applications

        Thai Van Trinh,이병제,Chang Won Jung 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1

        A compact wideband internal antenna based on an epsilon negative (ENG) zeroth-order resonator (ZOR) is proposed to operate in the ultra-high frequency (UHF) band (470–771 MHz) for ultra-high-defnition television (UHD-TV) applications. The antenna having a compact size of 9×220 mm2 is placed on the top edge of the 49-inch TV model. The bezel frame of the TV model is used as the substrate of the antenna. The antenna is fed by a coplanar waveguide with a ground plane (CPWG). A shorting plate was added to expand the ground plane of the CPWG structure to achieve resonance at lower frequencies. The ENG structure is formed by a meander line that generates zero-order resonances at higher frequencies in the UHF band. Based on analysis, the proposed antenna is fabricated and tested. The measurement results show that the refection coeffcient (S11) is under −6 dB in a wide frequency range from 440 to 910 MHz covering the entire UHF band. The fractional bandwidth is extended up to 69% with a peak gain of 4.8 dBi, and the average radiation efciency of the antenna is 75%.

      • KCI등재

        Estimating Stability of MTDC Systems with Different Control Strategy

        Thai-Thanh Nguyen,Ho-Ik Son,Hak-Man Kim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.2

        The stability of a multi-terminal direct current (MTDC) system is often influenced by its control strategy. To improve the stability of the MTDC system, the control strategy of the MTDC system must be appropriately adopted. This paper deals with estimating stability of a MTDC system based on the line-commutated converter based high voltage direct current (LCC HVDC) system with an inverter with constant extinction angle (CEA) control or a rectifier with constant ignition angle (CIA) control. In order to evaluate effects of two control strategies on stability, a MTDC system is tested on two conditions: initialization and changing DC power transfer. In order to compare the stability effects of the MTDC system according to each control strategy, a mathematical MTDC model is analyzed in frequency domain and time domain. In addition, Bode stability criterion and transient response are carried out to estimate its stability.

      • KCI등재

        Internal Reconfgurable Dipole–Loop Antenna Array for High Reception Rate of Wideband UHD‑TV Applications

        Thai Van Trinh,이병제,박태준,정창원 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6

        An internal reconfgurable Dipole–Loop antenna array, covering the entire ultra-high frequency (UHF) band for ultra-high defnition television (UHD-TV) applications is presented. The internal antenna array is used to overcome the infuence of electromagnetic interference when integrating the antenna element inside the TV model and to increase the gain and reception rate of receiving signals for television broadcasting. The antenna array is designed based on the Dipole–Loop antenna elements, placing on substrate material PC-ABS (polycarbonate-acrylonitrile butadiene styrene: εr=3.5, tan δ=0.005) of the bezel frame in the TV model. By simultaneously switching PIN diodes with two ON/OFF states, the antenna array can be frequency reconfgured to achieve a wide operating bandwidth for UHF (470–771 MHz) band. The spacing between the antenna elements in the array at each mode is chosen as 0.5λ0 (λ0 represents the free space wavelength of the highest frequency in the operating band). The proposed antenna array is designed, fabricated, and tested for experimental verifcation. Measurement results show that the antenna array is good for high reception rate of UHD-TV applications, with a −6 dB impedance bandwidth of 51.6% (460‒780 MHz), covering the whole UHF band. The 3 dB gain bandwidths of 42.5% and 54.6% are obtained with peak realized gains of 9.6 dBi and 8.5 dBi for the horizontal and vertical polarizations, respectively. In addition, the diversity performance parameters are obtained and evaluated using the mean efective gains of the elements, and the diversity gain using both simulation and measurement results. It shows that the proposed antenna array can receive multi-side signals, applied in diversity and MIMO systems.

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