Introduction to Development of KaVA Digital Filter using GPU

Jae-Hwan Yeom,Se-Jin Oh,Duk-Gyoo Roh,Dong-Kyu Jung,Chung-Sik Oh,Hyo-Ryoung Kim,Jae-Sik Shin,Ju-Yeon Hwang,Min-Gyu Song,Tae-Hyun Jung 한국천문학회 2018 天文學會報 Vol.43 No.1

한일공동VLBI상관기에서 관측 데이터의 동기재생처리를 위한 RVDB 시스템 개발과 성능시험

Oh, Se-Jin,Roh, Duk-Gyoo,Yeom, Jae-Hwan,Chung, Hyun-Soo,Lee, Chang-Hoon,Kim, Kwang-Dong,Kim, Hyo-Ryoung,Oyama, Tomoaki,Kawaguchi, Noriyuki,Ozeki, Kensuke 한국천문학회 2008 天文學論叢 Vol.23 No.2

In this paper, we introduce the performance evaluation and development of Raw VLBI Data Buffer(RVDB) system for the synchronized playback processing of observed data in Korea-Japan Joint VLBI Correlator(KJJVC). The high-speed correlation processing system is under development so that the radio data obtained with 8192 channels and 8 Gbps speed from 16 stations will be able to be processed. When the recorded data of each station are played to correlator, the time synchronization of each station is very important because the correlator should process the data obtained with same time and condition. There are many types of recorder systems in the East Asia VLBI Network (EAVN). Therefore it is required to prepare the special time synchronized playback processing system to synchronize the time tag of observed data. The developed RVDB system consists of Data Input Output(DIO), 10GbE switch, and Disk Data Buffer(DDB). It can record the data with maximum 2 Gbps speed, and can play back the data to correlator with nominal 2 Gbps speed. To enable to play back the data of different playback system to the correlator, we developed the high-speed time synchronized playback processing system. We carried out the experiments of playing back and correlation for gigabit correlator and VCS trial product so as to confirm the performance of developed time synchronized playback processing system. In case of online and offline playing back experiment for gigabit correlator, we confirmed that the online and offline correlation results were the same. In case of playing back experiment for VCS trial product, we verified that the wide band and narrow band correlation results were also the same. Through the playing back experiments of RVDB system, the effectiveness of developed RVDB system was verified. In this paper, the system design, construction and experimental results are shown briefly.

Plasmid-Mediated Quinolone Resistance and Extended-Spectrum Cephalosporin Resistance in Enterobacteriaceae Strains Isolated from Breeder Flocks

Jae Young Oh,Min Su Kang,In Yong Ji,Eun Gyeong Shin,Mi Jin Kim,Byung Ki An,Myo Kyoung Kim,Hye Ryoung Kim,Il Jang,Hee Soo Lee,Yong Kuk Kwon 대한수의학회 2012 대한수의학회 학술대회발표집 Vol.2012 No.-

Apoptotic Effects of Co-Treatment with a Chios Gum Mastic and Eugenol on G361 Human Melanoma Cells

Jae-Beom Jo,Sang-Hun Oh,In-Ryoung Kim,Gyoo-Cheon Kim,Hyun-Ho Kwak,Bong-Soo Park The Korean Academy of Oral Biology 2013 International Journal of Oral Biology Vol.38 No.3

We investigated the synergistic apoptotic effects of cotreatments with Chios gum mastic (CGM) and eugenol on G361 human melanoma cells. An MTT assay was conducted to investigate whether this co-treatment efficiently reduces the viability of G361 cells compared with each single treatment. The induction and augmentation of apoptosis were confirmed by DNA electrophoresis, Hoechst staining, and analyses of DNA hypoploidy. Western blot analysis and immunofluorescent staining were also performed to evaluate expression and translocation of apoptosisrelated proteins following CGM and eugenol co-treatment. Proteasome activity and mitochondrial membrane potential (MMP) changes were also assayed.The results indicated that the co-treatment of CGM and eugenol induces multiple pathways and processes associated with an apoptotic response in G361 cells. These include nuclear condensation, DNA fragmentation, a reduction in MMP and proteasome activity, an increase of Bax and decrease of Bcl-2, a decreased DNA content, cytochrome c release into the cytosol, the translocation of AIF and DFF40 (CAD) into the nucleus, and the activation of caspase-9, caspase-7, caspase-3, PARP and DFF45 (ICAD). In contrast, separate treatments of 40 μ g/ml CGM or 300 μM eugenol for 24 hours did not induce apoptosis. Our present data thus suggest that a combination therapy of CGM and eugenol is a potential treatment strategy for human melanoma.

Three-dimensional hierarchical Te-Si nanostructures.

Lim, Jae-Hong,Shin, Gyeong-Jin,Hwang, Tae-Yeon,Lim, Hyo-Ryoung,Lee, Young-In,Lee, Kyu-Hwan,Kim, Sung-Dae,Oh, Min-Wook,Park, Su-Dong,Myung, Nosang V,Choa, Yong-Ho RSC Pub 2014 Nanoscale Vol.6 No.20

<P>Three-dimensional hybrid nanostructures (i.e., Te 'nanobranches' on a Si 'nanotrunk' or Te 'nanoleaves' on a Si 'nanotrunk') were synthesized by combining the gold-assisted chemical etching of Si to form Si 'nanotrunks' and the galvanic displacement of Si to form Te 'nanobranches' or 'nanoleaves.' By adjusting the composition of the electrolyte used for the galvanic displacement reaction, the shape of the Te nanostructures could be changed from nanoleaves to nanobranches. The Si nanotrunks with Te nanobranches showed stronger luminescent emission in the visible region, with their Raman spectrum having a higher wave number, owing to their grain size being larger. This suggested that the optical and photoelectrochemical properties of Te-Si hybrid nanostructures depend on their shape and size. Using this approach, it should be possible to fabricate various hierarchical nanostructures for use in photoelectronic and photoelectrochemical devices.</P>

고효율 습식 아민 CO2 흡수제(KoSol-4)를 적용한 Test bed 성능시험

심재구 ( Jae Goo Shim ),이지현 ( Ji Hyun Lee ),곽노상 ( No Sang Kwak ),이인영 ( In Young Lee ),장경룡 ( Kyung Ryoung Jang ),장세규 ( Se Gyu Jang ),이경자 ( Kyung Ja Lee ),한광수 ( Gwang Su Han ),오동훈 ( Dong Hun Oh ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2

Test bed studies with highly efficient amine CO2 solvent (KoSol-4) developed by KEPCO research institute were performed. For the first time in Korea, evaluation of post-combustion CO2 capture technology to capture 2 ton CO2/day from a slipstream of the flue gas from a coal-fired power station was performed. Also the analysis of solvent regeneration energy was conducted to suggest the reliable performance data of the KoSol-4 solvent. For this purpose, we have tested 5 campaigns changing the operating conditions of the solvent flow rate and the stripper pressure. The overall results of these campaigns showed that the CO2 removal rate met the technical guideline (CO2 removal rate: 90%) suggested by IEA-GHG and that the regeneration energy of the KoSol-4 showed about 3.0~3.2 GJ/tCO2 which was, compared to that of the commercial solvent MEA (Monoethanolamine), about 25% reduction of regeneration energy. Based on these results, we could confirm the good performance of the KoSol-4 solvent and the CO2 capture process developed by KEPCO research institute. And also it was expected that the cost of CO2 avoided could be reduced drastically if the KoSol-4 is applied to the commercial scale CO2 capture plant.

석회화담낭을 동반하는 담낭신경내분비종 1예

이재우 ( Jae Woo Lee ),이상협 ( Sang Hyub Lee ),조영윤 ( Young Yoon Cho ),오수연 ( Soo Yeon Oh ),음영욱 ( Young Ook Eum ),한호성 ( Ho Seong Han ),김혜령 ( Hae Ryoung Kim ),김영훈 ( Young Hoon Kim ) 대한췌담도학회 2013 대한췌담도학회지 Vol.18 No.4

담낭신경내분비종은 드물게 발생하는 일차성 담낭암이며, 전산화단층촬영이나 초음파와 같은 통상적인 영상검사로 쉽게 발견되지 않는다. 석회화담낭 역시 드물기 때문에석회화담낭을 동반하는 신경내분비종은 매우 희귀하다. 명치부위 통증을 주소로 내원한 75세 여자환자가 전산화단 층촬영에서 석회화담낭과 다엽성 종괴가 발견되어 확대 담낭절제술을 시행하였고, 최종 병리소견으로 담낭신경내분 비종과 석회화담낭이 확진되었다. 석회화담낭을 동반하는 담낭신경내분비종은 이전에 보고된 바 없기에 저자들은 이 를 문헌고찰과 함께 보고하는 바이다. Gallbladder neuroendocrine tumor (NET) is a rare cause of primary gallbladder carcinoma, and cannot be easily detected by conventional radiologic study such as computed tomography (CT) or sonography. Porcelain gallbladder is also rare. Therefore, gallbladder NET accompanying porcelain gallbladder is very rare. We report here on a 75-year-old woman with gallbladder NET accompanying porcelain gallbladder, abdominal CT showed a porcelain gallbladder with a multilobulated mass lesion invading liver segment 8. Extended cholecystectomy was performed and the microscopic features of the resected specimen confirmed the diagnosis of gallbladder NET and porcelain gallbladder. Gallbladder NET accompanying porcelain gallbladder has not been reported. We report on this unusual case along with a review of the relevant literature.

Face and Eye Detection Robust to Facial Pose

Won Oh Lee,Kang Ryoung Park,Jae-ho Shin 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

Robust detections of face and eye regions are crucial for various applications such as gaze detection, face recognition, facial expression and age estimation, and so on. But it is difficult to detect face and eyes in case of various facial poses. To overcome this problem, we propose a new method to detect face and eyes regions robust to facial pose by using Adaboost, CamShift, and pyramidal KLT feature tracker. Experimental result showed that the accuracies of face and eye detection with various facial poses were 99.8% and 99.78%, respectively.

치근접촉이 마이크로 임플란트 인접골 응력에 미치는 영향에 대한 유한요소해석

유원재(Won-Jae Yu),김미령(Mi-Ryoung Kim),박효상(Hyo-Sang Park),경희문(Hee-Moon Kyung),권오원(Oh-Won Kwon) 대한치과교정학회 2011 대한치과교정학회지 Vol.41 No.1

마이크로 임플란트 시술의 중요한 위험요인 중 하나로 치근접촉 문제가 있으나, 관련 연구는 결과 분석에 치중되어 있고, 치근접촉이 마이크로 임플란트 안정성 상실로 이어지는 기전에 대한 연구는 아직 미흡한 것으로 보인다. 이에, 본 연구에서는 생역학적 측면에서 그 영향을 분석하였다. Absoanchor 마이크로 임플란트(SH1312-7, Dentos Inc., Daegu, Korea) 첨부가 치근에 접촉되어 있을 때, 저작압 전달에 의한 마이크로 임플란트 변위가 인접골에 가하는 압축응력을 축대칭 유한요소모델을 사용하여 계산하였다. 요소별 응력이 해면골의 최대압축강도나, 치밀골의 비정상 골개조 임계응력을 넘을 경우 해당 요소를 순차적으로 해석모델에서 제거하며 실행한 6단계해석의 결과, 마이크로 임플란트에 인접한 해면골의 전체적인 파절과 과부하에 따른 치밀골의 비정상 골개조가 임플란트 지지력 상실에 주요인이 될 것으로 평가되었다. 치밀골의 과부하 영역은 초기에는 치밀골판의 하부에 존재하였으나 상부로 확장되었고, 응력 재분포로 인한 감소효과 없이 양성 되먹임(positive feedback)으로 결국 치밀골 전 두께로 확대됨을 관찰하였다. 본 연구를 통해 치근접촉된 마이크로 임플란트가 인접골을 훼손시켜 안정성 상실로 이어지는 과정을 모사할 수 있었으며, 이로부터 치근접촉에 따른 마이크로 임플란트의 불량한 예후에 대한 생역학적 측면의 원인을 파악할 수 있었다. (대치교정지 2011;41(1):6-15) Objective: The aim of this study was to evaluate the biomechanical aspects of peri-implant bone upon root contact of orthodontic microimplant. Methods: Axisymmetric finite element modeling scheme was used to analyze the compressive strength of the orthodontic microimplant (Absoanchor SH1312-7, Dentos Inc., Daegu, Korea) placed into inter-radicular bone covered by 1 mm thick cortical bone, with its apical tip contacting adjacent root surface. A stepwise analysis technique was adopted to simulate the response of peri-implant bone. Areas of the bone that were subject to higher stresses than the maximum compressive strength (in case of cancellous bone) or threshold stress of 54.8MPa, which was assumed to impair the physiological remodeling of cortical bone, were removed from the FE mesh in a stepwise manner. For comparison, a control model was analyzed which simulated normal orthodontic force of 5 N at the head of the microimplant. Results: Stresses in cancellous bone were high enough to cause mechanical failure across its entire thickness. Stresses in cortical bone were more likely to cause resorptive bone remodeling than mechanical failure. The overloaded zone, initially located at the lower part of cortical plate, proliferated upward in a positive feedback mode, unaffected by stress redistribution, until the whole thickness was engaged. Conclusions: Stresses induced around a microimplant by root contact may lead to a irreversible loss of microimplant stability. (Korean J Orthod 2011;41(1):6-15)

Early detection of cardiac involvement in Miyoshi myopathy: 2D strain echocardiography and late gadolinium enhancement cardiovascular magnetic resonance

Choi, E Ryoung,Park, Sung-Ji,Choe, Yeon Hyeon,Ryu, Dong Ryeol,Chang, Sung-A,Choi, Jin-Oh,Lee, Sang-Chol,Park, Seung Woo,Kim, Byoung Joon,Kim, Duk-Kyung,Oh, Jae K BioMed Central 2010 Journal of cardiovascular magnetic resonance Vol.12 No.-

<P><B>Background</B></P><P>Miyoshi myopathy (MM) is an autosomal recessive distal myopathy characterized by early adult onset. Cardiomyopathy is a major clinical manifestation in other muscular dystrophies and an important prognostic factor. Although dysferlin is highly expressed in cardiac muscle, the effect of dysferlin deficiency in cardiac muscle has not been studied. We hypothesized that early myocardial dysfunction could be detected by 2D strain echocardiography and late gadolinium enhancement (LGE) cardiovascular magnetic resonance (CMR).</P><P><B>Method</B></P><P>Five consecutive MM patients (3 male) in whom we detected the DYSF gene mutation and age-matched healthy control subjects were included. None of the patients had history of cardiac disease or signs and symptoms of overt heart failure. Patients were studied using 2D strain echocardiography and CMR, with 2D strain being obtained using the Automated Function Imaging technique.</P><P><B>Results</B></P><P>All patients had preserved left ventricular systolic function. However, segmental Peak Systolic Longitudinal Strain (PSLS) was decreased in 3 patients. Global PSLS was significantly lower in patients with MM than in control subjects (p = 0.005). Basal anterior septum, basal inferior septum, mid anterior, and mid inferior septum PSLS were significantly lower in patients with MM than in control subjects (P < 0.0001, < 0.0001, 0.038 and 0.003, respectively). Four patients showed fibrosis by LGE. The reduced PSLS lesion detected by 2D strain tended to be in the same area as that which showed fibrosis by LGE.</P><P><B>Conclusions</B></P><P>Patients with MM showed subclinical involvement of the heart. 2D strain and LGE are sensitive methods for detecting myocardial dysfunction prior to the development of cardiovascular symptoms. The prognostic significance of these findings warrants further longitudinal follow-up.</P>