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이광훈 한국산업조직학회 2004 産業組織硏究 Vol.12 No.1
본 연구는 초고속 인터넷이 보편적인 인터넷 사용 환경이 된 한국에서 수집된 자료를 바탕으로 컨텐츠 서비스 산업에서의 소비자들의 행태를 분석하였다. 특히 인터넷 미디어를 통한 컨텐츠 서비스에 대한 소비지출이 기존의 전통적인 오프라인 컨텐츠 서비스에 대한 소비지출을 대체하는 정도를 결정하는 요인들에 대해 고찰하였다. 이를 위해 오프라인에서의 컨텐츠 소비 대비 인터넷을 매개체로 하는 컨텐츠 소비 비중을 인터넷 컨텐츠 소비지출에 의한 오프라인 컨텐츠 소비의 대체도를 나타내는 대응변수로 보고, 이를 결정하는 소비자 특성들을 토빗(Tobit)모델을 이용하여 분석하였다. 소비자들은 연령이 낮을수록, 직업이 있을수록, 가구소득이 높을수록 그리고 TV 시청 시간과 인터넷 이용 시간이 길수록 인터넷 미디어에 의한 전통적인 오프라인 컨텐츠의 대체도가 높아지는 것으로 밝혀졌다. This paper analyzes consumers' behaviors in the contents service industries, based on the data constructed from the structured survey in Korea where high speed Internet becomes universal type of Internet service. It focuses on the consumers' characteristics that affect the substitution of Intemet contents for traditional offline contents. For this, the degree of the substitution is proxied by the ratio of the expenditure for Internet contents to the expenditure for offline contents. Using Tobit models, younger consumers, consumers with higher household income, consumers with more daily TV watching hours and daily Intemet using hours tum out to substitute more offline contents consumption with the consumption of contents via Internet.
이광훈,백상호,최희경,전호석 한국자원공학회 2014 한국자원공학회지 Vol.51 No.4
This study was carried out for the development of separation process that can produce the ilmenite concentrate of over 48% TiO2 from low grade ilmenite crude ore. In order to reduce treatment cost and increase separation efficiency the magnetic separation at first was applied for recovering the magnetic minerals. Which reground would make the degree of liberation increase. which was treated by gravity separation to reject the gangue minerals from the magnetic product. Because the heavier product contains not only ilmenite but also magnetite and other gangue minerals, the product was treated by further dry magnetic separation to obtain the higher grade ilmenite concentrate. Finally, the high-grade ilmenite concentrate of 50.3% TiO2 could be obtained with recovery of 49.1% through the separation process developed in this study. 저품위 티탄철석으로부터 TiO2 48% 이상인 고품위 티탄철석 정광을 생산 할 수 있는 선별공정 개발 연구가 수행되었다. 선별비용 저감과 선별효율 향상을 위해 먼저 조립 산물에서 자력선별에 의해 자성산물을 회수한 다음, 단체분리도의 향상을 위해 재분쇄 하였다. 이것을 가지고 비중선별법을 적용하여 비중이 낮은 맥석광물들을 제거하였다. 이때 회수된 중광물에는 티탄철석과 비중은 비슷하나 강자성체인 자철광과 약자성 혹은 비자성인 맥석광물들이 함께 수반되어 있어서, 이들의 제거를 위하여 다시 건식 자력선별법을 적용하여 최종 티탄철석 정광을 회수하는 공정을 개발하였다. 본 연구에서 개발된 선별공정을 적용한 실험결과, 최적실험 조건에서 TiO2 품위와 회수율이 각각 50.3%와 49.1%인 최종 티탄철석 정광을 얻었다.
이광훈,주승문,염태준,정상훈 대한간암학회 2017 대한간암학회지 Vol.17 No.2
Background/Aims: To retrospectively compare conventional and drug-eluting beads transarterial chemoembolization (C-TACE and DEB-TACE) for treatment of hepatocellular carcinoma (HCC) at very early and early stages. Methods: We retrospectively compared patients treated with C-TACE (n=115) or DEB-TACE (n=103) from September 2009 to May 2016. All patients were in a very early (stage 0) or early stage (stage A) of the Barcelona Clinic Liver Cancer (BCLC) staging system, and all had Child– Pugh class A and ≤B7 liver status. Approval by the institutional review board was waived because the study was retrospective. The following parameters were evaluated: severe pain and bradycardia during TACE, post-embolization syndrome (PES), liver function change, complications, target tumor response, and conversion to another treatment modality. Numeric differences were assessed by the independent Student’s t-test for continuous variables and by chi-square test for categorical variables. Results: Severe intractable pain and bradycardia during the TACE procedure were significantly more frequent in the C-TACE group than in the DEB-TACE group (P<0.001). The incidence and duration of PES were significantly higher in the C-TACE group than in the DEB-TACE group (P<0.001). The increase in liver enzymes was significantly higher in the C-TACE group than in the DEB-TACE group (P<0.001). The deterioration of the Child-Pugh class was significantly higher in the C-TACE group than in the DEB-TACE group (P =0.006). There was no significant difference in serious complications except localized bile duct dilatation between the groups. There was no significant difference between the groups in tumor response at both immediate and 1-year assessment. The conversion rate to other treatment modalities was significantly higher in the DEB-TACE group than in the C-TACE group (P<0.001). Conclusions: DEB-TACE is better than C-TACE in terms of procedural safety as initial treatment in a very early or early stage of HCC.