Uterine Involution and Ovarian Follicular Growth during Early Postpartum Period of Murrah Buffaloes (Bubalus bubalis)

Lohan, I.S.,Malik, R.K.,Kaker, M.L. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.3

Ultrasonographic studies were conducted on eight Murrah buffaloes daily from day 6 postpartum (pp) onwards till day 77 pp to monitor changes in the cervix, uterine horn and ovarian follicular growth and development. The mean size of horn and cervix on day six ($9.07{\pm}0.74$ and $8.58{\pm}0.00cm$) decreased significantly to $4.09{\pm}0.09$ and $3.56{\pm}0.08cm$ by day 27 pp, respectively. Follicles in 50% of the buffaloes ovulated within 24 to 54 days pp and the size of the largest follicle on different days increased to more than 5 mm. The remaining 50 percent of animals ovulated after 65 days postpartum. Large size follicles (>8.5 mm) appeared in six out of eight buffaloes between 10 to 30 days pp and five animals had ovulated during early postpartum period. Waves pattern of follicular growth was observed during early postpartum period. Ovulatory follicles growth rate was more than the anovulatory follicles and increase in size was more as compared to the subordinate follicle. Anovulatory follicles persisted for longer period. Mean size of large follicle was more from day 6 to 41 pp and again from 50 to 65 pp in cyclic animals. Second large follicle were large during early postpartum (18days), thereafter, its size was more in acyclic animals. Small follicles population was less in cyclic animals upto day 50 postpartum. Mean medium size follicle growth pattern did not differ in cyclic and acyclic groups. Large size follicle number was more in cyclic group (5/8) during 14 to 20 days postpartum. Presence of large follicles (>8.5 mm) showed initiation of ovarian activity.

What’s Best for My Kids? An Empirical Assessment of Primary School Selection by Parents in Urban India

Amanish Lohan,Anirban Ganguly,Chitresh Kumar,John V,Farr 환태평양유아교육연구학회 2020 Asia-Pacific journal of research in early childhoo Vol.14 No.1

The purpose of the paper is to identify and prioritize a set of important attributes for school choice for millennial urban Indian parents. Analytic Hierarchy Process (AHP) was applied to data collected from seventy-five millennial parents from the National Capital Region (NCR) of India to identify their prioritization of attributes for school choice. The study found that millennial Indian parents consider the quality and reputation of the schools as the most important attributes for primary school selection for their wards, followed by the overall infrastructure of the school. Further, contrary to the existing literature, tuition fee received a lower attribute ranking, while location was the least important attribute. The findings suggest that lack of policy directive in the education sector has resulted in parents valuing the quality of schools in terms of reputation, infrastructure, etc. as more important attributes while ignoring travel time or tuition fees. The findings are expected to contribute towards helping academicians and practitioners to understand parental decision-making, more so from the Indian or developing country perspective.

Array-based GNSS signal tracking with a reduced state signal model

Lee, Sangwoo,Lohan, Elena Simona,Kim, Sunwoo IEEE 2016 IEEE transactions on aerospace and electronic syst Vol.52 No.3

<P>This paper introduces a reduced state signal model in which interfering signals are suppressed with the help of beamforming. Based on our model, a particle filtering algorithm integrated with beamformer for satellite navigation signal tracking is proposed to increase the computational efficiency and the robustness to the signal model mismatch from unknown interference. Through extensive simulations and flop complexity analysis, we verify the superiority of the proposed algorithm against existing Bayesian filtering algorithms without beamforming.</P>

Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES

Charette, Matthew A.,Lam, Phoebe J.,Lohan, Maeve C.,Kwon, Eun Young,Hatje, Vanessa,Jeandel, Catherine,Shiller, Alan M.,Cutter, Gregory A.,Thomas, Alex,Boyd, Philip W.,Homoky, William B.,Milne, Angela The Royal Society 2016 Philosophical transactions. Series A, Mathematical Vol.374 No.2081

<P>Continental shelves and shelf seas play a central role in the global carbon cycle. However, their importance with respect to trace element and isotope (TEI) inputs to ocean basins is less well understood. Here, we present major findings on shelf TEI biogeochemistry from the GEOTRACES programme as well as a proof of concept for a new method to estimate shelf TEI fluxes. The case studies focus on advances in our understanding of TEI cycling in the Arctic, transformations within a major river estuary (Amazon), shelf sediment micronutrient fluxes and basin-scale estimates of submarine groundwater discharge. The proposed shelf flux tracer is 228-radium (<I>T</I><SUB>1/2</SUB> = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf <SUP>228</SUP>Ra fluxes are combined with TEI/ <SUP>228</SUP>Ra ratios to quantify ocean TEI fluxes from the western North Atlantic margin. The results from this new approach agree well with previous estimates for shelf Co, Fe, Mn and Zn inputs and exceed published estimates of atmospheric deposition by factors of approximately 3–23. Lastly, recommendations are made for additional GEOTRACES process studies and coastal margin-focused section cruises that will help refine the model and provide better insight on the mechanisms driving shelf-derived TEI fluxes to the ocean.</P><P>This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.</P>

미국 버지니아텍 공대 신입생에 대한 ‘지속가능 에너지 설계’ 프로젝트 수업의 효과

김진수(Jinsoo Kim),Jennifer Mullin,Vinod Lohan 한국공학교육학회 2007 공학교육연구 Vol.10 No.1

이 논문은 미국의 버지니아텍 공과대학 신입생을 대상으로 2006년 가을 학기에 프로젝트 수업을 실시한 실험 연구의 결과이다. 버지니아텍에는 공학교육과가 2004년에 설립되었다. 이 실험에서는 신입생 1200여명을 모집단으로 하여 5개 반을 표본으로 선정하였다. 연구 대상의 과목은 공학탐구이며, 수업의 주제로는 지속가능 에너지 설계이며, 6주 동안에 걸쳐 매주 이론 50분과 웍샵 90분 수업을 각 모듬별로 수행하였다. 이론은 교수가 강의하고 ?p샵은 박사과정의 조교가 수업을 실시하였다. SPSS(버전 15)을 사용하여 통계 분석한 결과는 다음과 같다. 5개 집단의 학업 성취도에 대하여 사전 및 사후 검사 점수로 대응 표본 t 검증한 결과, 혼성 학급인 4개 집단에서는 유의 수준 .05에서 사후 검사가 유의미하게 증가하 였으나, 여성학급에서는 유의미한 증가가 없었다. 5개 집단의 태도에 대하여 대응 표본 t 검증한 결과, 5 개 집단 모두에서 약간씩 감소하였으며 유의미한 값은 아니다. 끝으로 이 프로젝트 수업을 통한 기능 향상의 기대감에 대하여 개방형 질문을 하였으며, 학생들은 팀?p, 디자인 과정, 지식에 대한 응답이 가장 많았다. In this study, the effect of a sustainable energy design project on academic achievement for engineering freshmen at Virginia Tech in fall semester 2006 in the United States was examined by experimental method. The department of engineering education at Virginia Tech was opened in 2004. In this experiment the population was approximately 1200 freshmen, and 5 classes were sampled. Subject name is engineering exploration, a theme of the instruction is sustainable energy design, the project was performed throughout a 6 weeks period with one by 50 minutes lecture conducted by faculty and one 90 minutes workshop conducted by GTAs (Graduate Teaching Assistants) every week. The statistical results using SPSS (ver. 15.0) are as follows: A paired-samples t test analysis was run on the pre- and posttest to determine academic achievement, the results indicated a significant increase in 4 classes of mixed gender at .05 significance level, but there was no significance at 1 group of female class. A paired-samples t test analysis was run on the pre- and posttest to get an attitude score, the results showed, the posttest scores decreased for 5 groups even though it was not statistically significant. Finally, in responses to an open-ended question about students perceptions of their improvement in skills, the 3 most frequently identified skills were teamwork, design process, knowledge.

Percutaneous transhepatic biliary drainage catheter fracture

Jia Rui Kwan,Keith Sheng Hng Low,Rahul Lohan,Vishal G Shelat 한국간담췌외과학회 2018 Annals of hepato-biliary-pancreatic surgery Vol.22 No.3

Percutaneous transhepatic biliary drainage (PTBD) is safe treatment for biliary decompression given certain indications. However, this is temporary until definitive drainage is established. We report on a 76-year-old lady with recurrent pyogenic cholangitis and PTBD catheter fracture. She had hepatitis B virus-related Child-Pugh class A liver cirrhosis, hypothyroidism, hyperlipidaemia, and previous atrial fibrillation with a background of mild mitral, tricuspid and aortic valvular regurgitation. She had history of laparoscopic cholecystectomy in the past. She was deemed to be a high operative risk and declined hepatic resection. She had undergone multiple endoscopic and percutaneous biliary interventions to control sepsis and stone burden. A bilateral PTBD catheter was left in situ with plans for 3-monthly change. However, she defaulted follow-up and presented 11 months later with complaints of pain over the drain site and inability to flush the right catheter. Abdominal X-ray and computed tomography scans detected right catheter fracture at two places, making three fragments. She underwent percutaneous removal of the proximal fragment by an interventional radiology team. A temporary 4 Fr catheter was inserted to maintain biliary access. Endoscopic removal of the intra-biliary fragments was done the next day. Complete removal was confirmed on fluoroscopy. Finally, the 4 Fr catheter was replaced by a new 12 Fr catheter. The patient was discharged well.

Changes in Plasma Levels of Inhibin and Follicle Stimulating Hormone in Buffaloes Superovulated with eCG

Singh, Baljit,Dixit, V.D.,Dixit, V.P.,Singh, P.,Georgie, G.C.,Lohan, I.S. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.9

The present study was undertaken to investigate the effect of stimulation of follicular development with eCG on the peripheral levels of inhibin and FSH in Murrah buffaloes. Estrus was synchronized in five normally cycling females by insertion of Crestar (Intervet, Boxmeer, Holland) implants for nine days. Estradiol valerate was administered i.m. on the day of implant insertion. On the 10th day of the induced estrous cycle a single dose of 3000 IU eCG (Folligon, Intervet, Boxmeer, Holland) was given, followed by treatment with 25 mg of $PGF_2$ alpha (Lutalyse, Upjohn, Belgium) 48 h later. Blood samples were obtained during the induced estrus, on cycle day 10 (luteal phase), at the superovulatory estrus (43 h after PGF) and during the periovulatory period (64 h after PGF). Ultrasonography was done daily to monitor follicular development. Plasma concentrations of inhibin and FSH were determined by specific radioimmunoassays. Differences between $mean{\pm}SEM$ values of different phases of the cycle were compared by ANOVA. The mean number of small (2-5 mm), medium (6-9 mm) and large (>10 mm) follicles observed two days after eCG treatment and on the day of superovulatory estrus was $2.8{\pm}0.31$, $5.2{\pm}0.30$ and $1.4{\pm}0.09$ and $1.9{\pm}0.21$, $2.8{\pm}0.40$ and $5.0{\pm}0.83$, respectively. The mean number of ovulations was $3.6{\pm}0.37$ and the mean number of unovulated follicles was $6.1{\pm}0.47$. Most of the follicles >10 mm in diameter had ovulated (72%). The mean ${\pm}SEM $ of plasma inhibin concentration $(2584.15{\pm}17.92pg/ml)$ during the superovulatory estrus was significantly higher $(p{\leq}0.05)$ than during the induced estrus $(749.87{\pm}17.29pg/ml)$, the luteal phase $(1099.54{\pm}24.98pg/ml)$ and periovulatory period $(1682.71{\pm}29.88pg/ml)$, respectively. $Mean{\pm}SEM$ plasma FSH concentration during the induced estrus $(10.35{\pm}0.41ng/ml)$ was not different from that during the superovulatory estrus $(8.52{\pm}0.39ng/ml)$, but was significantly higher $(p{\leq}0.05)$ than during the luteal phase $(2.81{\pm}0.42ng/ml)$ and periovulatory period $(5.7{\pm}0.28ng/ml)$. These data indicate that treatment with eCG in buffaloes for inducing superovulation results in a significant elevation in plasma inhibin levels and a decrease in plasma FSH levels during the superovulatory estrus. Thus, we suggest that the elevated plasma inhibin coming from fully developed follicles continued for a long time which results in inhibition of FSH leading to poor ovulation in the remaining follicles, which may be the cause of suboptimal superovulatory response.