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강희정(주저자) ( Hee Jung Kang ),강희정(교신저자) ( Hee Jung Kang ) 디자인융복합학회 2015 디자인융복합연구 Vol.14 No.6
세계적으로 창업의 중요성이 강조되고 있지만, 국내 디자인 분야의 경우 디자인전문회사의 공급과잉 상태로 가격 경쟁 격화, 저가 수주 만연 등 다양한 문제들이 발생하고 있다. 본 연구는 디자인창업자들의 현실적인 문제점을 파악하여 국내 디자인창업 현황에 대한 이해를 확장하고자 하였다. 연구목적을 달성하기 위하여 첫째, ``디자인창업 동기는 무엇인가.`` 둘째, ``디자인창업을 하는데 있어 애로 사항은 무엇인가.``로 연구 문제를 설정하였다. 연구 방법으로는 질적 연구 방법 중에서 내러티브 탐구 방법에 근거하여 자료 수집하였고, 분석 과정은 귀납적 분석 위주로 하고 해석적 분석을 추가하였다. 연구 결과, 연구 참여자들은 자아실현을 위해 창업을 하게 되었고,창업 성공의 기준을 높은 매출액에 두지 않았다. 또한 참여자들은 규모 경제 실현, 유통 개척, 자금 조달의 다양화, 제품의 선택과 집중에 어려움을 겪고 있었다. While there is a worldwide emphasis on the importance of startups, the Korean design industry suffers from an over supply of design companies, increased price competition and widespread low costs contracts etc. This study aims to expand the understanding of the current states of design based start-ups in Korea by determining related practical issues. To achieve the research objective, the research questions were set to first, "what is the motivation for the design based start-up" and second, "what are the difficulties in setting up a design based start-up." To collect data, the qualitative narrative inquiry method was used, and this data was analyzed using inductive analysis supplemented by interpretive analysis. The results of this study showed that the participants founded companies to realize their own visions and did not base the success of their startup on high revenues. The research also confirmed that the founders had difficulty in achieving economies of scale, opening distribution channels, diversifying sources of funding, selecting and focusing on a particular design service to offer.
류마티스 관절염에서 항Cyclic Citrullinated Peptide 항체의 진단적 유용성
강희정 ( Hee Jung Kang ),서영일 ( Young Il Seo ),이영경 ( Young Kyung Lee ),조현찬 ( Hyoun Chan Cho ) 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.2
Objective: Rheumatoid arthritis (RA) is the most common rheumatic disease but its diagnosis primarily relies on clinical disease manifestations. The serologic support is restricted to the determination of rheumatoid factor (RF), of which diagnostic ability is far from satisfaction. We compared the usefulness of a new serologic test, anti-cyclic citrullinated peptide antibodies (anti-CCP) for the diagnosis of RA with RF. Methods: Anti-CCP antibodies were determined in 220 serum samples; 134 from RA patients and 86 from controls including 33 healthy controls and 53 patients with other diseases. Of 33 sera of the healthy controls, 12 were RF positive, which were intentionally included for the better analysis of specificities. Anti-CCP was done with the enzyme-linked immunosorbent assay (ELISA). RF was also assayed in every sample, and results were compared to anti-CCP for sensitivity and specificity. Results: On each receiver operating characteristic curve, the area of under the curve was 0.843±0.028 for anti-CCP and 0.741±0.033 for RF. At each optimum cut-off value, the sensitivity of anti-CCP was comparable to that of RF (76.1% vs 67.2%) and the specificity of anti-CCP was better than that of RF (94.2% vs 74.4%, p 0.001). Importantly, 18 of 38 (47.4%) sera from RA patients negative for RF were positive for anti-CCP. Only one of 12 sera from healthy controls positive for RF was positive for anti-CCP. Conclusion: The anti-CCP ELISA showed high sensitivity even in RF negative RA patients, and very high specificity in healthy controls and disease control groups. The anti-CCP ELISA appeared a very useful new diagnostic test for RA.
도로 비점오염 해석을 위한 ROADMOD개발 및 적용: 도로청소 효과 분석
강희만 ( Heeman Kang ),전지홍 ( Ji-hong Jeon ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.2
In this study, an Excel-based model (ROADMOD) was developed to estimate pollutant loading from the road and evaluate BMPs. ROADMOD employs the Chezy-Manning equation and empirical expression for estimating surface runoff, and power function for pollutant buildup, and exponential function for pollutant washoff in SWMM. The results of model calibration for buildup and washoff using observed data revealed a good match between the simulation results and the observed data. The long-term surface runoff and sediment simulated by ROADMOD demonstrated a good match with those by SWMM with 2 ~ 14% of relative error. The shorter sweeping interval (within 8 days) remarkably decreased sediment loads from the road. It was found that the effect of reducing sediment loads from the road was greatly affected not only by the sweeping interval but also by sweeping on the day before a rainfall event. The 48% of removal efficiency of sediment loads from the road was achieved with 26 times of road sweeping per year when sweeping was performed on the day before the rainfall event. A 4-day sweeping interval showed similar removal efficiency (48%) with 96 times of sweeping per year. It is considered that the road sweeping on the day before a rainfall event could maximize the effect of reducing the non-point source pollution from the road with minimization of the number of road sweeping. So, the road sweeping on the day before a rainfall event can be considered as one of the useful and best management practices (BMPs) on road.
강희천(Hui-Cheon Kang),한병기(Byeong-Gi Han),김정대(Joung-Dae Kim),서승원(Seung-Won Seo),신철호(Chul-Ho Shin),박준석(Joon-Seok Park) 한국청정기술학회 2017 청정기술 Vol.23 No.3
본 연구는 오염현장에서 채취한 유류오염토양을 in situ 토양세정법으로 정화시 기술 적용성을 평가하기 위한 컬럼식 실험이다. 실험에 사용한 오염토양의 토성은 사토(sand)이었으며, 초기 TPH 오염농도는 9,369 mg kg<SUP>-1</SUP>이었다. 세정용액으로 0.1% Tween-80을 사용하였으며, 반응기로는 아크릴 원형컬럼과 유리 시린지컬럼을 사용하였다. 아크릴 원형컬럼 실험에서 0.1% Tween-80을 1 PV 주입하였을 때 토양 TPH의 35%가 제거되었고 이후 5 PV까지도 제거효율이 약 40% 정도로 큰 증가가 나타나지 않았으나 7 PV 주입하였을 때 약 60%가 제거되었다. 아크릴 원형컬럼 대신 유리 시린지컬럼을 사용하여 체류시간을 증가시키자 5 PV까지는 아크릴 원통컬럼을 사용한 경우보다 제거효율이 전반적으로 약 3 ~ 12% 높았으나 7 PV을 모두 주입하였을 때의 제거효율은 약 60%로 서로 차이가 없었다. 단독 alum과 alum+polymer 혼합응집제를 사용하여 폐세정액을 응집처리한 결과 최적 주입농도는 두 경우 모두 150 mg L<SUP>-1</SUP>인 것으로 나타났다. 응집처리한 Tween-80 폐세정액에 Tween-80을 0.1% 농도로 새로 용해하여 재사용 세정을 실시한 결과의 제거효율은 41.0%로 재사용하지 않은 0.1% Tween-80의 32.0% 보다 약 9% 높게 나타났다. This study was conducted to evaluate the feasibility of in situ soil flushing for TPH-contaminated soil remediation with column test. The soil texture of the soil was sand and the initial TPH concentration was 9,369 mg kg<SUP>-1</SUP>. 0.1% Tween-80 was selected as surfactant solution. And the acrylic and the glass syringe columns were used as reactors. In the acrylic column test, 35% of the initial TPH was removed in 1 PV of flushing and approximately 40% in 5 PV and finally 7 PV showed about 60%. The glass column test showed 3 ~ 12% higher removal efficiency than that of acrylic test until 5 PV of flushing. However, there was no difference in TPH removal efficiency when 7 PV of surfactant was finally flushed. Both of alum only and alum+polymer mixed surfactants showed also the best coagulation efficiency in 150 mg L<SUP>-1</SUP> of concentraion. When Tween 80 was newly dissolved in 0.1% to the recovered solution after the coagulation treatment, the removal efficiency was increased from 32.0% to 41.0% in comparison to the new 0.1% Tween 80 solution without reuse by coagulation treatment.