http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Statistical Evaluation of the Multi-Frequency GPS Ionospheric Scintillation Observation Data
Naveed Ahmed,Jiwon Seo 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
With the growing overdependence on the widely available Global Navigation Satellite System (GNSS) technology, the demand of the secure, reliable and accurate navigation especially for the aviation market has been a major concern of the satellite navigation engineers. The ionospheric scintillation is one of the most dangerous and sophisticated phenomena that not only compromises the accuracy of the receiver’s position, velocity and time (PVT) output but also the reliability of receiver’s performance in such critical situations. The maximum intensity scintillation occurs after every 11 years on average and, therefore, due to lack of available data, there are not enough practical studies to study this phenomenon. In this paper, we study the strong scintillation data collected during the last strong solar maximum event in 2013 at the Ascension Island. The frequency-to-frequency correlation is selected as an important metric to study the fading signals. The observations and the results discussed in the paper are the significant contributions toward the practical study of real ionospheric scintillation data and, hence, provide a strong ground for the future research.
Efficient Soical Network Data Analysis by Utilizing Cloud Computing Infrastructure
Naveed Ejaz,Irfan Mehmood,이정중,백성욱,이명호,안성만 한국차세대컴퓨팅학회 2012 한국차세대컴퓨팅학회 논문지 Vol.8 No.3
소셜 네트워크는 이용자들의 공통적 관심 분야를 기반으로 서로 연결된 개별적 온라인 서비스 구조이다. 소셜 네트워킹 웹사이트의 사용은 온라인 커뮤니케이션과 데이터 공유 및 상호작용 방법을 혁신적으로 바꿔놓았다. 소셜 네트워킹 사이트의 사용량이 증가함에 따라 막대한 양의 사용자 상호작용 데이터가 매일 축적되고 있어 다양한 분야에서의 적용을 위한 대량의 소셜 네트워크 데이터 마이닝 및 분석 방안이 갈수록 주목받고 있다. OLAP데이터 분석은 효과적으로 소셜 데이터를 분석하기 위하여 사용될 수 있는 유용한 데이터 분석방법이지만 계속적으로 가변하는 대량 데이터와 OLAP쿼리의 복잡성 때문에 작업 시간이 오래걸리는 문제점이 있다. 본 논문은 대량의 소셜 네트워크 데이터 분석에 적합한 클라우드 컴퓨팅의 발전이 이루어지면서 효율적이고 빠른 데이터 분석을 위하여 클라우드 컴퓨팅 플랫폼을 사용하는 OLAP기반 소셜 데이터 분석도구에 대해 설명한다.
Optimal Management of Lower Polar Calyceal Stone 15 to 20 mm
Naveed Haroon,Syed M Nazim,M Hammad Ather 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.4
Purpose: To compare the stone clearance rate, efficiency quotient (EQ), and early complications of shock wave lithotripsy (SWL) and percutaneous nephrolithotomy (PCNL)for solitary lower-pole renal stones measuring 15 to 20 mm. Materials and Methods: This was a retrospective matched-pair analysis of 142 patients (78 in the SWL and 64 in the PCNL group). Preoperative imaging was done by use of noncontrast computed tomography (CT kidney, ureter, and bladder [KUB]), intravenous urogram, or plain X-ray and ultrasound KUB to assess the largest dimension of the stones. Only patients with radiopaque stones were included. The stone-free rates were assessed with plain X-ray and ultrasound at 4 weeks. Data were analyzed by use of SPSS ver. 19. Results: The patients’ demographic profiles (age, body mass index) and the stone sizes were comparable in the two groups. The mean stone size was 17.4±2.12 in the PCNL group compared with 17.67±2.04 in the SWL group (p=0.45). At 4 weeks, 83% of patients undergoing PCNL were stone-free compared with 51% in the SWL group (p<0.001). The EQ for the PCNL group was 76% compared with 44% for the SWL group (p<0.001). Ancillary procedures were required by 9% of patients in the PCNL group compared with 15% in the SWL group. The complication rate was 19% in both groups. The SWL complications were minor. Conclusions: Stone clearance from the lower pole of solitary stones sized 15 to 20 mm at the greatest diameter following SWL is poorer. These calculi can be better managed with percutaneous surgery owing to its higher efficacy and acceptably low morbidity.
( Naveed Aslam ),( Muhammad Abdullah ),( Muhammad Fiaz ),( Jalees Ahmad Bhatti ),( Zeeshan Muhammad Iqbal ),( Nasrullah Bangulzai ),( Chang Weon Choi ),( Ik Hwan Jo ) 한국동물자원과학회(구 한국축산학회) 2014 한국축산학회지 Vol.56 No.13
The production performance of multiparous lactating Sahiwal cows (n = 24) was evaluated according to both milking frequency and method. Selected animals were randomly divided into four groups containing six animals each under a completely randomized design. Cows in groups A & B were milked by the hand milking method three times per day, respectively. Similarly, cows in groups C & D were milked by the machine milking method two and three times per day, respectively. All animals were maintained under uniform feeding and management conditions. Dry matter intake was high in animal groups milked three times per day, and it remained unchanged between the hand and machine milking methods. Milk yield was higher (P < 0.05) in cows milked three times compared to those milked twice per day, and it did not differ between hand and machine milking methods. Milk fat percentage was higher (P < 0.05) in cows milked twice per day compared to those milked three times using both machine and hand milking methods. The percentage of total solids showed a similar pattern as the fat percentage. However, percentages of protein, lactose, and non-fat solids in milk were not significantly different(P > 0.05) among the treatment groups. Collectively, the results show that milking three times per day instead of twice at 8-hour intervals can enhance milk yield in Sahiwal cows using both hand and machine milking methods.
Naveed, Abbas,Choi, Bong-Soo,Tran, ThanhTuan,Seo, Dongsun Institute of Korean Electrical and Electronics Eng 2016 전기전자학회논문지 Vol.20 No.4
We demonstrated experimentally a variable optical frequency comb source using a cascaded dual parallel Mach Zehnder modulator (DPMZM) and a phase modulator (PM). With this simple configuration and applying low drive voltages, we generated variable comb source composed of spectral lines 3, 5, 7, 9 and 11 with 10-GHz frequency spacing, also generated 2 and 3 spectral lines with 20 GHz frequency spacing. The generated comb source maintains high spectral coherence across the entire bandwidth with good spectral flatness (within 1-dB for 2, 3, 5, 7 comb lines, within 2-dB for 9-comb lines and within 3-dB for 11 comb lines). The flat and variable comb source is mainly achieved by manipulating 6 operating parameters of DPMZM, setting RF amplifier gain, connected at phase modulator and phase shifters. Hence the method is simple and offers great flexibility in achieving flat and variable comb spectrum, which is experimentally demonstrated. This brings advantages of power efficiency due to low driving voltages, simplicity and cost effectiveness to the system.