Geo-located Positioning and Counting of Rice Plants in UAV images

( Nasim Reza ),( Xu-hua Dong ),( Sang-eon Oh ),( Kyeonghwan Lee ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.2

Rice plants density in the field has a great impact on it’s final yield and grain quality. Precise and timely estimates of plants position and counting provides better farming to assure highyield. But plant position and counting works are very challenging, time consuming and often rely on labor extensive. Unmanned aerial vehicle based imaging provides fast and accurate solution to check plants position and count. The objective of this study was to evaluate geo-located position and counting of rice plants using low altitude UAV images. We used three Sony alpha 5100L digital camera attached to a DJI S1000 octocopter drone. RGB images were taken from an altitude of 8m using and were used for automated feature extraction and matching to generate orthomosaic image. We designed an algorithm to identify rice plant position with coordinates to monitor during the growing period. We calculated ground sampling distance of orthomosaic image and the pixel size in each image. Then, we calculated the distance of plant from the reference position. Finally, we calculated coordinates for each plant using distance information and verified the position. The results showed high accuracy of plant positions and counting. The proposed method indicated that the plant positioning using aerial images could be an ideal technique to monitor each crop throughout the growing season.

A New Alkene Glycoside from the Leaves of Sasa quelpaertensis Nakai

Nasim Sultana,Nam Ho Lee 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4

The Role of Peroral Cholangioscopy in Evaluating Indeterminate Biliary Strictures

Nasim Parsa,Mouen A. Khashab 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.6

Biliary strictures are considered indeterminate when the initial radiologic evaluation and endoscopic retrogradecholangiopancreatography with brush cytology and/or forceps biopsy do not reveal diagnostic findings. Evaluation of these stricturesis challenging and often requires a multidisciplinary approach and multiple procedures. Peroral cholangioscopy allows directvisualization of these lesions and targeted tissue acquisition using miniature biopsy forceps. In the past decade, there have beensignificant improvements in the field of cholangioscopy. These advances have allowed higher-quality image acquisition, easy setup,operation by a single operator, easy maneuverability, and excellent targeted tissue sampling performance. However, the interpretationof cholangioscopic visual findings remains challenging. In this review, we discuss the role of peroral cholangioscopy in the evaluation ofindeterminate biliary strictures.

An Efficient Method of Vehicle Distance Detection Based on Canny edge detector and Gray value intensity

Nasim Arshad,Won hee Kim,Kwang-Seok Moon,Jong Nam Kim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

In this paper, the wheel detection with distance estimation algorithm is proposed using one camera mounted beside the vehicle of our experimental car, Figure 1. The Canny edge detection and gray intensity are applied for the tire marking and vehicle detection in our work. The side of the vehicles can be easily detected by comparing the gray intensity with the road surface color. The image coordinate model is then utilized for the distance estimation with the still images of the vehicle in different distances. The distances used for this study ranged from 30 ㎝ to 100㎝. This system will be extended in the future for estimation of distance in moving vehicle sequences to give us more efficient result.

Formation of few-layer graphene flake structures from graphite particles during thin film coating using dry spray deposition method

Nasim, M.N.E.A.A.,Chun, D.M. Elsevier Sequoia 2017 THIN SOLID FILMS - Vol.622 No.-

This work demonstrates the formation of few-layer graphene flake structures directly from graphite particles. A nano-particle deposition system, which is a dry spray deposition method generally used for deposition of metals and ceramics, has been introduced to deposit graphite particles at room temperature. In this study, graphite powder was deposited on a Cu substrate without using binders and the deposited thin film was characterized. The deposited thin film contained few-layer graphene flake structures, as observed using field effect scanning electron microscopy and confirmed using X-ray diffraction, Raman spectroscopy and field emission transmission electron microscopy. We also suggested the critical impact velocity for deposition of few-layer graphene flake structured thin film and a mechanism for forming few-layer graphene flake structures during thin film preparation. The suggested mechanism was interlayer separation of micron-sized graphite particles and fragmentation of particles into small pieces during deposition due to the impact of graphite particles on the substrate.

Evaluation of Related Risk Factors in Number of Musculoskeletal Disorders Among Carpet Weavers in Iran

Nasim Karimi,Abbas Moghimbeigi,Majid Motamedzade,Ghodratollah Roshanaei 한국산업안전보건공단 산업안전보건연구원 2016 Safety and health at work Vol.7 No.4

Background: Musculoskeletal disorders (MSDs) are a common problem among carpet weavers. This study was undertaken to introduce affecting personal and occupational factors in developing the number of MSDs among carpet weavers. Methods: A cross-sectional study was performed among 862 weavers in seven towns with regard to workhouse location in urban or rural regions. Data were collected by using questionnaires that contain personal, workplace, and information tools and the modified Nordic MSDs questionnaire. Statistical analysis was performed by applying Poisson and negative binomial mixed models using a full Bayesian hierarchical approach. The deviance information criterion was used for comparison between models and model selection. Results: The majority of weavers (72%) were female and carpet weaving was the main job of 85.2% of workers. The negative binomial mixed model with lowest deviance information criterion was selected as the best model. The criteria showed the convergence of chains. Based on 95% Bayesian credible interval, the main job and weaving type variables statistically affected the number of MSDs, but variables age, sex, weaving comb, work experience, and carpet weaving looms were not significant. Conclusion: According to the results of this study, it can be concluded that occupational factors are associated with the number of MSDs developing among carpet weavers. Thus, using standard tools and decreasing hours of work per day can reduce frequency of MSDs among carpet weavers.

A Secure Face Cryptography for Identity Document Based on Distance Measures

Nasim Arshad,Kwang-Seok Moon,Jong-Nam Kim 한국멀티미디어학회 2013 멀티미디어학회논문지 Vol.16 No.10

Effects of vertical component of near-field ground motions on seismic responses of asymmetric structures supported on TCFP bearings

Nasim Partovi Mehr,Faramarz Khoshnoudian,Hamed Tajammolian 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.20 No.6

The effects of vertical component of earthquakes on torsional amplification due to mass eccentricity in seismic responses of base-isolated structures subjected to near-field ground motions are studied in this paper. 3-, 6- and 9-story superstructures and aspect ratios of 1, 2 and 3 have been modeled as steel special moment frames mounted on Triple Concave Friction Pendulum (TCFP) bearings considering different period and damping ratios. Three-dimensional linear superstructures resting on nonlinear isolators are subjected to both 2 and 3 component near-field ground motions. Effects of mass eccentricity and vertical component of 25 near-field earthquakes on the seismic responses including maximum isolator displacement and base shear as well as peak superstructure acceleration are studied. The results indicate that the effect of vertical component on the responses of asymmetric structures, especially on the base shear is significant. Therefore, it can be claimed that in the absence of the vertical component, mass eccentricity has a little effect on the base shear increase. Additionally, the impact of this component on acceleration is remarkable so the roof acceleration of a nine-story structure has been increased 1.67 times, compared to the case that the structure is subjected to only horizontal components of earthquakes.

Seismic response evaluation of concentrically rocking zipper braced frames

Nasim Irani Sarand,Abdolrahim Jalali 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.3

In this study an innovative rocking zipper braced frame (RZBF) is proposed to overcome the deficiencies of common concentrically braced frames. RZBF is an improved rocking concentrically braced frame which is based on combination of rocking behavior and zipper columns. The base rocking joints and post-tensioned bars provide rocking response and restoring force, respectively. Also, zipper columns distribute the unbalance force over the frame height and reduce the damage concentration. To evaluate seismic performance of RZBF, a comparison study is carried out considering concentrically braced frame, zipper braced frame, rocking concentrically braced frame and RZBF. Thereby, a suite of non-linear time history analyses had been performed on four different types of archetypes with four, six, eight, ten and twelve stories. Frames were designed and non-linear time history analyses were conducted in OpenSees. To compare the seismic behavior of the archetypes, roof drifts, residual roof drifts, story drifts, the forces of first and top story braces, PT bars forces, column uplift and base shears were taken in to consideration. Results illustrate that using RZBF, can reduce the damage due to reduced residual drifts. Zipper columns enhance the seismic performance of rocking systems. As the number of stories increase in the RZBF systems, larger top story braces were needed. So the RZBF system is applicable on low and midrise buildings.

Cyclic variations of gonad development of an air-breathing fish, Channa striata in the lentic and lotic environments

Nasim Al Mahmud,Hassan Md. Hafizur Rahman,Golam Mohammod Mostakim,Mohd. Golam Quader Khan,Md. Shahjahan,Nahid Sultana Lucky,M. Sadiqul Islam 한국수산과학회 2016 Fisheries and Aquatic Sciences Vol.19 No.1

The study was conducted to know the cyclic changes in gonadal maturation and to investigate the developmental stages of oocytes and testicular germ cells of an air-breathing fish, Channa striata. Fish were sampled monthly from lentic and lotic environments of three geographical locations of Bangladesh from December to November and the histological analysis of their gonad was done to evaluate the objectives. The highest mean GSI was 5.95 ± 0.20 for female in July and 0.14 ± 0.01 for male also in July showing that the gonadal development reached its peak during this month. The highest mean oocyte diameter was 1257.50 ± 24.17 μm observed in July implying that the oocyte reached maturity in this month. Histological study of ovary revealed the evidence of early yolk granule stage and late yolk granule stage from April to July. In case of male four stages of spermatogenesis were distinguished and spermatozoa were highly abundant in June and July. So the monthly pooled values of GSI and the analysis of gonadal histology indicated that the peak breeding season of C. striata occurred in July in the lentic and lotic environments. Samples collected from lentic and lotic habitats are suggestive of no difference in the development of the gonad. The results of the present study will be useful for selective breeding programme, conservation and sustainable fishery management of C. striata in its natural habitat.