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1회선 분기점을 갖는 병행 2회선 송전선로 고장점 표정 알고리즘
權寧珍,美想熙,李承宰,崔勉松 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
This paper presents a fault location algorithm of a single phase-to-ground fault on a parallel transmission line which contains a teed circuit. The method uses only the local end voltage and current signals. Zero sequence currents of other lines are calculated by distribution factors. Instead of zero sequence current, negative sequence current is used to remove the effect of load current and to calculate the voltage of a fault resistance. There are three distance equations in this algorithm. One of them is to calculate inner part fault location without teed circuit and another equation is for outer part fault location without teed circuit and the other is to calculate inner part fault location with teed circuit. Correct fault distance is selected by the condition of each solution. Extensive simulation studies using EMTP have verified that the proposed algorithm can calculate an accurate fault distance in spite of effects of various error sources.
목조 건축문화재의 화재위험도 평가지표 및 활용방안 연구
강석진(Kang, Seok-Jin),고명환(Ko, Myong-Hwan),김동진(Kim, Dong-Jin) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.7
본 연구는 문화재로 지정된 주요 목조 건축물을 방재(특히 화재예방)의 관점에서 안전하게 보호하고 피해를 최소화할 수 있는 방안마련을 위한 기초연구로서, 목조 건축문화재의 방재현황(화재 위험도)을 평가할 수 있는 지표 와 활용방안 제안을 목적으로 체크리스트를 작성하여 현장조사를 실시하는 방법으로 진행되었다. 체크리스트는 관리· 운영·대응의 관리운영, 배치계획·시설계획의 건축계획, 소방시설·방범시설의 설비계획으로 구성하였다. 내장사와 화엄 사를 대상으로 실시한 현장조사에서는 중요도가 높은 항목들에 여러 가지 문제점이 있는 것으로 나타났다. The purpose of this study was to propose the categorized checklist for fire risk assessment on the wooden cultural properties and to carry out field survey. The survey checklist was composed of categories such as management and administration measures(management, training and countermeasure), architectural planning measures(site plan and facility plan), and equipment measures(fire-fighting and crime prevention facility). In this study, the field survey was carried out in the Nae-jang-sa and Wha-um-sa and it was found that there were some problems in the items which were assessed importantly by experts.
( Ji Oung Kang ),( Hee Jin Kwon ),( Jin Han Cho ),( Jong Young Oh ),( Kyung Jin Nam ),( Seong Kuk Yoon ),( Myong Jin Kang ),( Sung Wook Lee ),( Sang Yeong Han ) 대한소화기학회 2012 Gut and Liver Vol.6 No.3
Background/Aims: The purpose of this study was to as-sess the value of acoustic radiation force impulse (ARFI) for predicting the extent of radiofrequency ablation (RFA) in hepatocellular carcinoma (HCC) by correlating the elastic-ity of HCC and peritumoral parenchyma (as measured by ARFI) with the extent of ablation determined by computed tomography (CT). Methods: From September 2009 to June 2011, 158 patients underwent RFA ablation for HCC (single, ≤3 cm). We evaluated the data of a total of 38 prospectively enrolled patients who underwent both ARFI imaging and contrast-enhanced CT after one session of 12 minutes of RFA without a change in needle position. The ARFI imaging indices, including the mean shear wave velocity (SWV) of HCC, mean SWV of the peritumoral parenchyma and tumor size, were evaluated to determine the statistical correlation with RFA extent after one session of 12 minutes of RFA. Results: A stiffer liver parenchyma in patients with cirrhosis results in a smaller ablation zone. Conclusions: SWV of ARFI in liver parenchyma was well correlated with RFA extent. After evaluating the correlation between ARFI and RFA extent, we suggest that the SWV in liver parenchyma might be a non-invasive supplementary tool for predicting the extent of RFA. (Gut Liver 2012;6:362-367)
지각된 위험과 소비자 특성이 외식소비자의 기술기반 셀프서비스(TBSS) 지속이용의도에 미치는 영향
이진명 ( Lee Jin-myong ),심민용 ( Sim Minyong ),강명수 ( Kang Myeongsu ),강효경 ( Kang Hyogyeong ),장진아 ( Jang Jina ),김다영 ( Kim Dayoung ) 한국소비자학회 2019 소비자학연구 Vol.30 No.1
기술기반 셀프서비스(Technology-based Self Service; TBSS)의 활용범위가 넓어지며 소매유통을 비롯한 서비스업계 전반에 무인화가 빠르게 진행되고 있다. 본 연구의 목적은 TBSS에 대한 소비자의 지각된 위험을 탐색하고, 지각된 위험과 기술에 대한 소비자 특성으로서의 혁신성과 자기효능감이 TBSS 지속이용의도에 미치는 영향을 규명하는 것이다. 이를 위해 외식업체에서 무인주문기기를 이용한 경험이 있는 일반 소비자 17명을 대상으로 심층면접을 실시하여 지각된 위험의 양상과 하위요인을 탐색하고, 정성조사 결과와 문헌고찰을 토대로 구조화된 질문지를 개발하여 온라인 설문조사를 시행하였다. 총 343명의 응답 자료를 SPSS 24.0 프로그램을 활용하여 분석하였다. 본 연구의 주요 결과를 요약하면 다음과 같다. 첫째, TBSS 이용에 있어서 소비자들이 지각하는 위험은 시간 위험, 프라이버시 위험, 기능 위험, 서비스 위험, 인간가치상실 위험의 다섯 가지 하위차원으로 분류되었고, 이중 시간 위험과 기능 위험을 상대적으로 높게 지각하는 것으로 나타났다. 둘째, 다중회귀분석 결과, 기능 위험, 서비스 위험, 인간가치상실 위험은 외식소비자의 TBSS 지속이용의도에 유의한 부정적 영향을 미치는 것으로 나타났고, 소비자의 혁신성과 자기효능감은 TBSS 지속이용의도에 유의한 긍정적 영향을 미치는 것으로 나타났다. 반면, 시간 위험과 프라이버시 위험의 영향력은 유의하지 않았다. 본 연구의 결과는 외식업체를 비롯하여 TBSS 적용을 검토하는 산업계에 유용한 실무적 시사점을 제공하며, 기술과 소비자 간 상호보완적 관계의 형성과 발전의 필요성을 논의한다는 점에서 학문적 의의를 가진다. The growth in self service options based on technology has been remarkable. Service providers, including restaurants, are rapidly employing various kinds of technologies to encourage consumers to perform services for themselves. However, it is necessary to consider whether today's consumers are ready to embrace technology-based self-service (TBSS) wholeheartedly.This study aims to explore consumers’ perceived risk of TBSS and to investigate the effects of perceived risk, consumer innovativeness and self-efficacy on the intention to use TBSS continuously. For this purpose, we designed a study combining qualitative and quantitative methods. Firstly, we explored sub-factors of consumers' perceived risk to TBSS through in-depth interview with 17 general consumers who have used self service ordering system in restaurants. Second, online survey was conducted using questionnaires developed on the basis of qualitative research and literature review. A total of 343 samples were analyzed using SPSS 24.0 software.The results of this study are summarized as follows. First, the perceived risks of consumers in TBSS use were classified into five sub-factors: time risk, privacy risk, functional risk, interaction risk, and loss of humanity risk. Among them, time risk and functional risk were perceived relatively high. Second, multiple regression analysis revealed that functional risk(β=-.101), interaction risk(β=-.164), and loss of humanity(β=-.186) had a significant negative impact on the intention to use TBSS continuously. While, consumers' innovativeness(β=.104) and self-efficacy (β=.376) had a significant positive effect on the intention to use TBSS continuously. The influence of time risk and privacy risk was not significant.This study provides practical implications for service practitioners considering or planning the application of TBSS including restaurants. In addition, this study has an academic significance in that it discusses the necessity of development and mutual complementary relationship between technology and consumer.
Radiofrequency Ablation Treatment for Renal Cell Carcinoma: Early Clinical Experience
Park, Seong-Hoon,Yoon, Seong Kuk,Cho, Jin Han,Oh, Jong Young,Nam, Kyung Jin,Kwon, Hee-Jin,Kim, Su-Yeon,Kang, Myong Jin,Choi, Sunseob,Sung, Gyung-Tak The Korean Radiological Society 2008 KOREAN JOURNAL OF RADIOLOGY Vol.9 No.4
<P><B>Objective</B></P><P>To evaluate the early clinical experience associated with radiofrequency (RF) ablation in patients with renal cell carcinoma (RCC).</P><P><B>Materials and Methods</B></P><P>The RF ablation treatment was performed on 17 tumors from 16 patients (mean age, 60.5 years; range, 43-73 years) with RCC. The treatment indications were localized, solid renal mass, comorbidities, high operation risk, and refusal to perform surgery. All tumors were treated by a percutaneous CT (n = 10), followed by an US-guided (n = 2), laparoscopy-assisted US (n = 2), and an open (n = 2) RF ablation. Furthermore, patients underwent a follow-up CT at one day, one week, one month, three and six months, and then every six months from the onset of treatment. We evaluated the technical success, technical effectiveness, ablation zone, benign periablation enhancement, irregular peripheral enhancement, and complications.</P><P><B>Results</B></P><P>All 17 exophytic tumors (mean size, 2.2 cm; range, 1.1-5.0 cm) were completely ablated. Technical success and effectiveness was achieved in all cases and the mean follow-up period was 23.8 months (range, 17-33 months). A local recurrence was not detected in any of the cases; however, five patients developed complications as a result of treatment, including hematuria (n = 2), mild thermal injury of the psoas muscle (n = 1), mild hydronephrosis (n = 1), and fistula formation (n = 1).</P><P><B>Conclusion</B></P><P>The RF ablation is an alternative treatment for exophytic RCCs and represents a promising treatment for some patients with small RCCs.</P>