Design of the Channel Allocation Procedure of the IEEE 802.11 Ad-hoc Networks for Traffic Control Systems

Tsung-Han Lin,B. C. Wang,Pau-Lo Hsu 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

Design and Implementation of SDN-based 6LBR with QoS Mechanism over Heterogeneous WSN and Internet

( Tsung-han Lee ),( Lin-huang Chang ),( Wei-chung Cheng ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.2

Recently, the applications of Internet of Things (IoTs) are growing rapidly. Wireless Sensor Network (WSN) becomes an emerging technology to provide the low power wireless connectivity for IoTs. The IPv6 over low-power wireless personal area networks (6LoWPAN) has been proposed by IETF, which gives each WSN device an IPv6 address to connect with the Internet. The transmission congestion in IoTs could be a problem when a large numbers of sensors are deployed in the field. Therefore, it is important to consider whether the WSN devices have be completely integrated into the Internet with proper quality of service (QoS) requirements. The Software Defined Network (SDN) is a new architecture of network decoupling the data and control planes, and using the logical centralized control to manage the forwarding issues in large-scale networks. In this research, the SDN-based 6LoWPAN Border Router (6LBR) is proposed to integrate the transmission fromWSNs to Internet. The proposed SDN-based 6LBR communicating between WSNs and the Internet will bring forward the requirements of end-to-end QoS with bandwidth guarantee. Based on our experimental results, we have observed that the selected 6LoWPAN traffic flows achieve lower packet loss rate in the Internet. Therefore, the 6LoWPAN traffic flows classified by SDN-based 6LBR can be reserved for the required bandwidth in the Internet to meet the QoS requirements.

Hydration of DCPD over sulfonic acid-functionalized SBA-15 catalyst

Yu-Cheng Lin,Yu-Wei Huang,Ku-Hsiang Sung,Tsung-Han Lin,Soofin Cheng 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.44 No.-

Sulfonic acid-functionalized SBA-15 materials (SA-SBA-15) with ordered channeling pores weresynthesized by one-pot co-condensation and used to catalyze the hydration of dicyclopentadiene(DCPD). The target product, cydecanol (DCPD-OH) has been used as a modifier for polyester or alkydresin. Propylsulfonic acid functionalized SBA-15 was found to be more efficient than the silica gelcounterpart or arylsulfonic acid functionalized material in catalyzing DCPD hydration to yield DCPD-OH. The DCPD conversion and DCPD-OH yield increased with the decrease in H2O/DCPD ratio. Optimal DCPDconversion and DCPD-OH selectivity were obtained with the molar composition of DCPD:H2O:H+[1TD$DIF]-catalyst = 1:30:0.1.

Simulation and Comparison of the Lighting Efficiency for Household Illumination with LEDs and Fluorescent Lamps

Wen-Shing Sun,Chuen-Lin Tien,Jui-Wen Pan,Tsung-Hsun Yang,Chih-Hsuan Tsuei,Yi-Han Huang 한국광학회 2013 Current Optics and Photonics Vol.17 No.5

The design of the LEDs lighting in general household illumination was proposed and compared with the fluorescent lighting in this study. Using the LED as a light source would promote energy saving lighting for household illumination purposes. We used the LightTools and DIALux software to design and simulate different standards of illuminance, different correlated color temperatures and different color rendering indices for household environments. The power consumption and efficiency of traditional illuminated light sources and an LED light source with the same standard of illuminance for lighting the household environment were analyzed and compared with each other. Finally, our results show the advantages of using white-light LEDs for lighting and household illumination.

Effects of spray operating time on spray cooling heat transfer performance and surface hydrophilicity using Al2O3 -water nanofluid

Tong-Bou Chang,Tsung-Han Lin,Jhong-Wei Huang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6

An experimental investigation is performed into the two-phase spray cooling heat transfer performance of Al 2 O 3 -water nanofluid given three different nanoparticle concentrations (0, 0.001 and 0.05 vol%) and three different spray operating times (10, 20 and 30 hours). The results show that for an Al 2 O 3 concentration of 0 vol% (i.e., pure DI water), the spray operating time has a negligible effect on the heat transfer performance. However, for Al 2 O 3 concentrations of 0.001 and 0.05 vol%, the heat transfer coefficient decreases with an increasing spray operating time. For the nanofluid with 0 vol% Al 2 O 3 , the spray operating time has only a small effect on the surface hydrophilicity. However, for the nanofluids with nanoparticle concentrations of 0.001 and 0.05 vol%, respectively, the surface hydrophilicity increases with an increasing spray operating time. Furthermore, the surface hydrophilicity also increases with an increasing nanoparticle concentration for a given spray operating time. The energy dispersive X-ray spectroscopy (EDS) results reveal the presence of a nanoparticle layer on the sprayed surfaces with a higher heat flux. The thickness of the deposited layer increases with an increasing spray operating time, and leads to a lower heat transfer performance and a higher surface hydrophilicity as a result.

고추 침수 내성 자원 선발을 위한 생육 특성 조사

강석범,양은영,조명철,Takeshi Tajima,Tsung Han Lin,Shih-Wen Lin,Yen-Wei Wang,Cynthia Kung Man Yee,Derek Barchenger,Roland Schafleitner 한국국제농업개발학회 2021 韓國國際農業開發學會誌 Vol.33 No.2

본 연구는 세계채소센터의 고추 유전자원들에 대한 침수조건에서 생육특성을 조사해 침수 저항성 자원을 선발하기 위해 수행하였다. 세계채소센터 유전자원센터에서 보유중인 4종의 고추 8자원을 선발하여 유리온실에서 종자를 파종하여 2개월 간 육묘한 후 본 실험을 위해 비닐하우스로 이동 후 침수시험을 수행하였다. 시험에 이용된 고추는 고온인 여름철에 시험이 수행되어 침수에 대한 반응이 매우 빠르게 나타났다. 1. 침수 처리구에서 생육이 전체적으로 감소 되었으나 저항성 자원들은 대조구와 비교하여 초장에 있어 유의성 있는 차이를 보이지 않았다. 2. 침수 처리 후 고추자원의 엽온 조사에서는 No. 29 (9656-13) 자원을 제외한 모든 침수구에서 엽온이 대조구에 비해 높게 유지되었다. 3. 감수성 자원들은 위조지수가 1.5 이상을 나타냈으나 내침 수성 자원들은 0.5로 낮게 유지되었다. 4. SPAD 값을 조사한 결과에 있어서는 침수로 인해 전체적으로 대조구에 비해 10% 낮은 수치를 나타냈다. 5. Proline 함량에 있어서는 침수구에서 전체적으로 Proline 함량이 높게 나타났으나 내침수성이 강했던 No. 8과 22는 대조구와 유의차가 없이 낮았다. 6. 침수자원들에 대한 침수와 고온에 따른 화분활력 조사에서는 침수에서 일부 자원의 화분활력 감소를 확인하였으며, 고온처리에서 처리구 대부분의 화분 활력이 유의하게 감소하는 결과를 나타냈다. 7. 본 시험을 통해 이번 시험의 고추자원 중 Capsicum bacatum 종인 No. 8 (VI028788), No. 12 (VI044312) 자원 이 침수저항성이 강한 자원으로 판단되어 1차 선발하였다. Chili pepper (Capsicum sp.) is an important crop across tropical, subtropical, and temperate regions of Asia. There is interest in producing pepper in rice-based cropping systems, which are subjected to long periods of waterlogging conditions. The objective of our study was to characterize the response of previously reported tolerant and sensitive Capsicum accessions to waterlogging under subtropical conditions. We tested eight chili pepper accessions from four species (Capsicum annuum, C. baccatum, C. chacoense, and C. frutescens) for their response to waterlogging stress. Plants exposed to stress treatment were subjected to waterlogging in pots for 5 days from July 27, 2020 to July 31, 2020 after transplantation by placing the pots in trays filled with water up to a height of 20 cm, while control plants were normally irrigated. At five days after waterlogging, most accessions showed reduced plant width growth, while some accessions, No. 8 (VI028788) and No. 12 (VI044312) showed slight reduction compared to control plants. Leaf temperatures were significantly higher in flooded plants compared to the control plants, except in accession No. 29 (9656-13). The wilt index of waterlogging sensitive accessions was greater than 1.5, while tolerant accessions had wilt scores of less than 0.5. For all accessions, the soil plant analysis development (SPAD) value was reduced by 10% under stress compared to control plants. Proline content in flooded plants was significantly higher than that in control plants with No. 8 (VI028788) and No. 22 (PBC481) showing the smallest increase. Pollen viability in some accessions was decreased after waterlogging. However, the effect of high temperature was much greater in most accessions as expected. Based on these results, waterlogging stress accessions No. 8 (VI028788) and No. 12 (VI044312) were identified as having the potential for tolerance to waterlogging stress.

Properties of Pepper Accessions under Flooding in Summer Season

Seok-Beom Kang,Seok-Beom Kang,Yun-Young Yang,Takeshi Tajima,Tsung Han Lin,Shih-Wen Lin,Yen-Wei Wang,Derek Barchenger 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.5

Establishment of the Model Widely Valid for the Melting and Vaporization Zones in Selective Laser Melting Printings Via Experimental Verifications

Chang-Shuo Chang,Kuan-Ta Wu,Chang-Fu Han,Tsung-Wen Tsai,Sung-Ho Liu,Jen-Fin Lin 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1

The thermally affected material properties operating in the three phases and porosity variations in the SS316L steel powder have been introduced to the numerical analyses for the transient volumetric heat source (Q) models developed for the solid powder, melting, and vaporization regions in the selective laser melting (SLM). The bulk Q is thus a function of these heat sources and their ratio defined for the liquid and vapor phases. The heat conduction developed for the solid powders with porosity strings the heat convection with Q as the moving heat source to solve two-dimensional temperature distributions efficiently without the confinement of operating conditions and phase presumption. The specimens with single- and multiple-track printings are prepared to investigate the effects of incident energy density (E) and power intensity (I o) on the geometries of single-track printings and the areal surface roughness (Sa) values of the multiple-track printings with 0 and 50% overlap ratios. Laser power and scanning velocity are the controlling factors for the melting pool depth D and width W . D and W become the governing factors for the keyhole with evaporations, which affects the height H of single track after solidification. The W and D results predicted by the theoretical models developed in this study have an error range, 5–20%, compared to the experimental ones, which is much lower than those reported in the literatures (Gusarov et al. in J Heat Transf 131(7):072101, 2009. https ://doi.org/10.1115/1.31092 45 ; Hussein et al. in Mater Des 52:638–647, 2013. https ://doi.org/10.1016/j.matde s.2013.05.070 ; Yin et al. Int J Adv Manuf Technol 83(9–12): 1847–1859, 2016. https ://doi.org/10.1007/s0017 0-015-7609-x ; Andreotta et al. in Finite Elem Anal Des 135: 36–43, 2017. https ://doi.org/10.1016/j.finel .2017.07.002 ). The contact angle ( ϕ * ) is defined as a function of single-track width ( W ) and solidification height ( H ). ϕ * and Sa are significantly reduced as an E is applied beyond its critical value (47.62–57.14 J/mm 3 ). Significant change in Sa is ascribed to the big difference in the morphology and its surface pattern when E or I o reaches its critical value.

Properties of Pepper Accessions under Flooding in Winter Season

Seok-Beom Kang,Myeong-Cheol Cho,Yun-Young Yang,Tsung-Han Lin,Shih-Wen Lin,Yen-Wei Wang,Derek Barchenger 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.5

Properties of Pepper Accessions under Flooding in Summer Season

Seok-Beom Kang,Myeong-Cheoul Cho,Yun-Young Yang,Tsung-Han Lin,Shih-Wen Lin,Yen-Wei Wang,Derek Barchenger,Hyungmin Rho 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10

Pepper (Capsicum sp.) is one of the major vegetable crops in the world. Recently, flooding frequently occurs around the world as climatic change becomes more serious. Especially, damages of flooded pepper continuously increased in poorly drained cultivation areas and paddy upland soil of pepper. This experiment was carried out to investigate the flooding stress tolerance of pepper accessions among the World Vegetable Center collection during the summer growing season. We used 17 pepper accessions from five species, (C. annuum; C. baccatum; C. chacoense; C. Chinese, and C. frutescens) and grew the seedlings for two months in seven-inch pots filled with sterilized garden soil with four replications. After the two-month growth, flooding was imposed for five days by submerging the pots into water. Growth and stress responses were measured to evaluate tolerance to flooding stress of the accessions. Five days after the flooding treatment, the pots were drained and maintained for three days for recovery. Finally, three days after the water drainage, growth and stress responses were reevaluated to assess plant recovery from flooding stress. After five days of flooding, plant height decreased with the exceptions of PBC2029, VI028788, VI029116, VI057807, VI029485, and PBC 934, which were not significantly different from the control. Plant canopy width was significantly depressed by the flooding for all accessions. The number of flowering plants tended to be decreased by the flooding treatment but there was no significant difference. In the summer season, wilting quickly occurred all of the accessions; especially, C. chinense and C. frutescens accessions were sensitive to flooding stress but AVPP9824 (C. annuum), VI029119, and VI044312 (C. chacoense) showed resistant response to the flooding. In all flooded accessions, the leaf temperature of pepper significantly increased at five days compared to the first day of flooding. SPAD index of pepper tended to be decreased in most accessions but, AVPP9824 and VI013286 were not different compared to the control. Pollen viability was variable among the accessions of this experiment. Proline content significantly increased in all of the accessions by the flooding treatment. From the results, we found that AVPP9824 (C. annuum), VI029119, and VI044312 (C. chacoense) accessions exhibited tolerance characteristics to flooding stress in the measured variables, but further research is needed to confirm this finding.