• 대한가정학회지
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• 제45권2호
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• pp.63-75
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• 2007

The purpose sof this study was to examine consumer's addictive buying through the TV home shopping, focused on materialism, show host and credit card use consumer. Two hundred four female consumers who had purchased fashion items in TV home shopping had participated for this study. For data analysis, descriptive statistics, factor analysis, t-test, and multiple regression were used for the study with SPSS 12.0 program. The result were as follows. First, the addictive buying group was 13.2% among respondents while non-addictive buying group was 86.8%. Second, materialism was classified into 3 factors: happiness, success and possessiveness. Show host was classified into 3 factors such as visual presentation, image and communication skill. Credit card was classified into 3 factors: sales promotion, late payment and method payment. Results of multiple regression revealed that happiness and possessiveness from materialism, credit card late payment, and show host communication skill were significantly related to addictive buying. Based on these results, this study would provide fashion marketing strategies for reasonable and reasonable consuming culture, since addictive buying has been not only individual problem but also social problem. Based on these results, this study would provide fashion marketing strategies for reasonable and reasonable consuming culture, since addictive buying has been not only individual problem but also social problem.

• Radiation Oncology Journal
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• 제36권2호
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• pp.114-121
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• 2018

Purpose: To explore the feasibility of maximum diameter as a response assessment method for vestibular schwannomas (VS) after stereotactic radiosurgery or fractionated stereotactic radiotherapy (RT), we analyzed the concordance of RT responses between maximum diameters and volumetric measurements. Materials and Methods: Forty-two patients receiving curative stereotactic radiosurgery or fractionated stereotactic RT for VS were analyzed retrospectively. Twelve patients were excluded: 4 did not receive follow-up magnetic resonance imaging (MRI) scans and 8 had initial MRI scans with a slice thickness >3 mm. The maximum diameter, tumor volume (TV), and enhanced tumor volume (ETV) were measured in each MRI study. The percent change after RT was evaluated according to the measurement methods and their concordances were calculated with the Pearson correlation. The response classifications were determined by the assessment modalities, and their agreement was analyzed with Cohen kappa statistics. Results: Median follow-up was 31.0 months (range, 3.5 to 86.5 months), and 90 follow-up MRI studies were analyzed. The percent change of maximum diameter correlated strongly with TV and ETV (r(p) = 0.85, 0.63, p = 0.000, respectively). Concordance of responses between the Response Evaluation Criteria in Solid Tumors (RECIST) using the maximum diameters and either TV or ETV were moderate (kappa = 0.58; 95% confidence interval, 0.32-0.85) or fair (kappa = 0.32; 95% confidence interval, 0.05-0.59), respectively. Conclusions: The percent changes in maximum diameter and the responses in RECIST were significantly concordant with those in the volumetric measurements. Therefore, the maximum diameters can be used for the response evaluation of VS following stereotactic RT.

• Journal of Chest Surgery
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• 제53권6호
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• pp.325-331
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• 2020

Background: We evaluated the association between tricuspid annular dilatation and the development of moderate or severe tricuspid regurgitation (TR). Additionally, we determined the optimal tricuspid annular dilatation threshold to use as an indicator for tricuspid annuloplasty in patients with less-than-moderate functional TR (FTR). Methods: Between August 2007 and December 2014, 227 patients with less-than-moderate TR underwent mitral valve surgery without a tricuspid valve (TV) procedure. The TV annular diameter was measured via transthoracic echocardiography. The TV annular index (TVAI) was calculated as the TV annular diameter divided by the body surface area. The mean duration of echocardiographic follow-up was 42.0 months (interquartile range, 9.3-66.6 months). Results: Eight patients (3.5%) developed moderate or severe TR. The rate of freedom from development of moderate or severe TR at 5 years was 96.2%. TV annular diameter, left atrial diameter, preoperative atrial fibrillation, and TVAI were found to be associated with the development of moderate or severe TR in the univariate analysis. A cut-off TVAI value of 19.8 mm/㎡ was found to predict the development of moderate or severe TR, and a significant difference was observed in the development of TR of this severity based on this cut-off (p<0.001). Conclusion: The progression of TR was not infrequent in patients with untreated lessthan-moderate FTR. An aggressive treatment approach can be helpful to prevent the progression of FTR for patients with risk factors, especially TVAI greater than 19.8 mm/㎡.

• 정보와 통신
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• 제26권10호
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• pp.32-39
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• 2009

본고에서는 지상파DMB에서 방송소비자에게 TV/Radio 위주의 단방향 서비스에서 환골탈태하여 그동안 많은 사람들이 발전방향으로 기대하였던 모바일 방송통신 융합 서비스인 DMB2.0 (DMB2.0이란 명칭은 확정된 명칭이 아니라 아직 가칭이지만, 2.0이 의미하는 DMB에 서비스를 접목하는 측면에서 굳이 새 이름이 필요하겠냐는 게 대다수의 의견이다)에 대해서 단순히 데이터방송을 하나 추가하면서 너무 거창한 포장을 하는 것이 아니냐는 생각이 있을 수도 있겠으나, 그렇지 않음을 서비스 기획 측면에서 알아본다.

• 한국항행학회논문지
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• 제15권1호
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• pp.61-68
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• 2011

차세대 유럽형 디지털 지상파 방송 표준으로 알려진 DVB-T2 시스템은 ASO(Analogue Switch Off) 이후, HD급 이상의 고품격 방송 서비스 제공을 위해서 DVB 프로젝트에 의해 개발된 최신 유럽형 지상파 방송 표준이다. 본 논문에서는 DVB-T2 시스템의 전체적인 시스템 구조 및 특징을 대략적으로 기술하고, 다양한 채널환경에서 성능을 분석하였다. 실험에 사용한 채널은 AWGN 채널, 레일리 채널, 라이시안 채널, 0db-echo 채널이며, ETSI EN 302 755 표준에 따라서 제작된 Full 시뮬레이터를 통해 전산실험을 수행한 후, Implementation Guideline에서 제시하고 있는 성능과 비교 평가하였다.

• 한국통신학회논문지
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• 제21권6호
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• pp.1370-1378
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• 1996

A subjective video quality assessment methods are proposed based on CCIR Rec. 500-5 for an evaluation and testing of compressed video quality and performance of video codec to be designed in accordance with the MPEG-2 MP ML specification which is adapted as a DTV standard for Korea digital DBS. Video sequence compressed in compliance with MPEG-2 MP ML encoding parameterswastested by the proposed video quality evaluation procedure. Test sequence were compressed at the bit rate 6Mbps, 7.5Mbps and 9Mbps, repectively. Test results of the 7.5Mbps bitrate showed a satisfactory picture quality at about 4.0 on the 5.0 absolute scale of ITU-R 500-5.

• 한국자기학회지
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• 제26권5호
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• pp.173-178
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• 2016

두경부와 전립선 암 환자에서 CT조영제가 방사선치료계획에 미치는 영향을 확인하고 선량계산 정확성 향상을 위하여 본 연구를 실시하였다. 30명의 환자에 대하여 Pinnacle 8.0 시스템을 이용하여 조영제에 의한 조직의 전자밀도 변화를 측정하였으며 각각의 방사선치료계획을 통한 선량계산을 실시하였다. Pinnacle과 Tomotherapy planning 시스템을 이용하여 각각의 전자밀도와 3D 입체조형방사선치료(3D CRT)와 세기변조방사선치료(IMRT)계획을 수립하였다. 조영제에 의한 전자밀도의 변화는 4%이하로 두경부: 표적용적 2.1%, 이하선 1.9%, 하악선 3.6%, 혀 0.9%, 척수 0.3%, 식도 2.6%, 하악골 0.1%, 전립선: 표적용적 0.7%, 림프절 1.1%, 방광 1.2%, 직장 1.5%, 소장 1.2%, 대장 0.6%, penile bulb 0.8%, 대퇴골두 -0.2%로 나타났다. 선량계산의 차이는 2.5% 이하의 선량 증가가 발생하였다(3D CRT: 두경부 0.69~2.51%, 전립선 0.04~1.14%, IMRT: 두경부 0.58~1.31%, 전립선 0.36~1.04%). 이러한 오차는 임상에서 허용 가능한 오차 이내이지만 영상융합(조영증강 영상과 조영증강 하지않은 영상)이나 ROI import 기능을 활용하여 조영 증강하지 않은 영상에서 선량계산을 실시한다면 1~3%의 방사선치료계획 선량 오차를 줄일 수 있을 것으로 기대된다.

• 조명전기설비학회논문지
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• 제16권6호
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• pp.51-59
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• 2002

논문은 가전기구의 사용으로 발생하는 유도전압 및 자장의 측정과 분석에 대한 것으로 본 실험에 사용한 유도전압과 자장 측정회로는 유도코일, 선행증폭기, 그리고 능동적분기로 구성하였다. TV와 퍼스널 컴퓨터용 모니터는 스위칭소자로 동작하는 전원장치를 사용하므로 고조파 성분을 많이 포함하는 강한 자장과 유도전압을 발생시켰다. 14"TV 주변에서 큰 자장과 높은 유도전압이 나타났고, 그 값은 측정거리 0.4 ［m］에서 각각 2.1 ［$\mu$Tp-p］와 140［mVp-p］이었다. 그러나 동일한 측정거리에서 단위 자장의 세기에 대한 유도전압은 17"모니터에서 약560 ［mV/$\mu$T］로 가장 크게 나타났다.장 크게 나타났다.

• International journal of thyroidology
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• 제11권2호
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• pp.137-142
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• 2018

Background and Objectives: Radioactive iodine therapy (RAI) is an important treatment modality of Graves' disease (GD), but there is still not a consensus on the optimal dosage regimen. We studied the treatment success rate of different RAI doses, and examined which clinical markers were useful for determining the optimal RAI dosage for successful therapy in Korean patients. Materials and Methods: We retrospectively studied 123 patients with GD treated with RAI between 2004 and 2014 at Chonnam National University Hwasun Hospital. The responder group was defined as patients who developed hypothyroidism requiring levothyroxine replacement following RAI, regardless of the RAI dosage. Results: A total of 54 patients (43.9%) became hypothyroid after the first dose, and 31 needed two to four additional doses to achieve hypothyroidism. In the responder group as a whole (85 patients), the mean total dose of RAI was $15.5{\pm}7.0mCi$ and the mean thyroid volume (TV) was $35.4{\pm}23.4mL$. When divided into low dose (<15 mCi, n=46) and high dose (${\geq}15mCi$, n=39) responder groups, TV was significantly lower in the low-dose responder group ($25.7{\pm}11.4$ vs. $48.4{\pm}31.3$, p<0.001). The optimal cut-off TV for the low-dose responder group was <32.37 mL (sensitivity 80.9%, specificity 76.7%). Conclusion: TV had significant effects on the outcome of RAI in GD patients. The optimal fixed RAI dose for Korean GD patients with a large goiter (${\geq}33mL$) should be at least 15 mCi to achieve the best outcome.

• 정보와 통신
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• 제29권3호
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• pp.26-32
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• 2012

본 고에서는 최근 스마트폰의 활성화와 더불어 새로운 융합 서비스로 자리잡은 스마트 TV를 바탕으로 차세대 스마트 TV로 발전하기 위하여 필요한 네트워크 요소 기술에 대해 간단히 알아보고, IPTV2.0 기술을 응용하여 차세대 스마트 TV를 제공하는 방안과 더불어 양방향 N-스크린 서비스를 실현하기 위한 네트워크 기반의 제공 구조에 대하여 알아본다. 또한, 세계적으로 환경 보호 정책이 기술적인 이슈로 등장함에 따라 유무선 네트워크에서도 이를 수용하기 위한 전략이 큰 관심사로 떠오르고 있다. 따라서, 그린 IT 실현을 위한 미래 네트워크에 대한 고찰로써, 에너지 네트워크의 모델링, 네트워크 기기의 효과적인 활용과 가상화 관점에서 고려되어야 할 이슈들을 분석해 봄으로써 향후 미래 네트워크에서 요구하는 기술들에 대하여 알아본다.