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      • Development of Non-Precious Metal Electrocatalysts Based on Mo-Compounds for Electrochemical Hydrogen Production

        윤덕현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

        Development of efficient electrocatalysts for hydrogen evolution reaction (HER) with earth-abundant, non-precious materials is crucial for practical large-scale hydrogen production from electrochemical water splitting. Molybdenum compounds (Mo-compounds) are attracting attention as a promising replacement for Platinum. Here we synthesized molybdenum carbide, nitride, and sulfide nanocrystals on CNT-graphene hybrid support via modified urea-glass route and their electrochemical activities for hydrogen evolution reaction were systematically investigated. Among the prepared catalysts, Mo2C/CNT-graphene (Mo2C/CNT-GR) showed the highest activity for hydrogen evolution reaction (HER) with small overpotential of 62 mV and Tafel slope of 58 mV/dec as well as an excellent stability in acid media. Vastly improved electron transfer characteristics by incorporating CNT-graphene hybrid and low hydrogen binding energy compared to the others are mainly responsible for the excellent activity.

      • 유비쿼터스 러닝 시스템 구현을 위한 기반기술 연구

        윤덕현,주종혁 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.23 No.2

        With the proliferation of Internet and Multimedia technology, standard-based e-Learning systems have been active area of research and development. However, introduction of the emerging technologies - broadband networking, broadcasting/telecommunication convergence, mobile smart devices and GRID computing - induces the development of next generation on-line education system. In this paper, we present that concept of u-Learning system, which is an on-line education system in the ubiquitous computing environments. It can help students more in an ubiquitous education environment to the activation at the study. More high education service is predicted more to consist to students.

      • KCI등재후보

        Effects of Suspended Solids, pH and Salinity on the Chemical Fate of Oxolinic Acid in the Aquatic Environment

        윤덕현,김무찬,Yoon Duk-Hyun,Kim Mu-Chan The Korean Society of Marine Environment and safet 2006 海洋環境安全學會誌 Vol.12 No.2

        해양환경에서 오염물질의 거동은 화학적 특성뿐 아니라 부유물질 표면의 정전하, pH 및 염분과 같은 환경 인자에 크게 영향을 받을 것이다. 이 연구는 해산어 양식장에서 빈번히 사용하고 있는 항생제인 옥소린산의 거동이 여러 종류의 부유물질, 염분 및 pH에 따라 어떻게 변동하는가를 HPLC에 의한 화학적 분석과 bioassay 분석으로 검토하였다. 부유물질의 농도가 증가할수록 옥소린산은 HPLC 분석에 의해서도 저농도로 검출되었고, 생물활성에 의한 bioassay 분석으로도 현저히 감소하는 것으로 나타났다. 이 결과는 부유물질이 옥소린산을 흡착하여 수서환경에서 제거하는 역할을 한다는 것을 알 수 있다. 그리고 옥소린산은 염분 40%o과 pH 7에서 bioassay 분석에 의해 생물활성이 약간 저해되지만 HPLC 분석은 조금 다른 양상을 보였다. The fate of chemical pollutants in the aquatic environment is generally considered to be strongly influenced by environmental factors such as pH, salinity and electrostatic charges on the surface of particles ai well as by the characteristic of chemicals. Oxolinic acid was measured by chemical analysis using HPLC to determine the effect of salinity, pH and suspended solids on chemical binding and by bioassay for measuring bioactivity. The higher contentration of suspended solids in the medium, the lower concentration of oxolinic and was detected in measurements from by both HPLC and biosssay analysis. This indicates particle may have a stronger binding or absorption effect on oxolinic acid. Bioassay analysis showed weaker bioacivity at higher salinity and pH 7.0, but this result of bioassay analysis was different from the result of HPLC.

      • KCI등재후보

        Effects of Oxolinic Acid on Microbial Community under Simulated Marine Fish Farm Environment

        윤덕현,김무찬,Yoon Duk-Hyun,Kim Mu-Chan The Korean Society of Marine Environment and safet 2006 海洋環境安全學會誌 Vol.12 No.2

        The microbial response after treatment of antibiotics was studied for investigating the resistance pattern under simulated aquaculture environment. A marine microcosm was developed for marine fish farm environment using artificial seawater and sediment. Oxolinic acid, which has been commonly used in aquaculture, was employed for the experiment. Resistance patterns and the changes of microbial community were monitored before. during and after use of oxolinic acid. Vibrionaceae was the dominant bacterial species throughout the experiment, consisting 65-75% of total bacterial number in fish farm environment. However, some gram-positive bacteria, Micrococcos sp. and Bacillus sp. strains in marine farm environment were increased in proportion to their number during the treatment. ETS activity of the bacterial communities in aquaculture environment was reduced to 42-67% during the treatment of oxolinic acid. But recovering trends of bacterial number were also detected immediately after cease of oxolinic acid treatment. Frequent treatment of oxolinic acid under the simulated fish farm environment showed bacterial resistance to increase sharply. 이 연구는 해산어 양식장 환경을 재현한 해양 microcosm을 이용하여, 양식장에서 빈번히 사용하고 있는 옥소린산에 대한 미생물이 나타내는 항생제 내성획득에 관해 알아보고자 하였다. 옥소린산 처리 전과 후의 세균상을 비교한 결과, 비브리오 과 세균은 실험기간 전반에 걸쳐 65-75% 정도로 우점하였으며, 그람양성세균인 Micrococcos sp. 와 Bacillus sp. 는 옥소린산 처리 기간 중에 출현 빈도가 증가하였다. 해산어양식 환경에서 세균의 ETS 활성은옥소린산 처리 기간중 42-67%로 줄어들었지만, 옥소린산의 처리가 종료된 후에 세균은 다시 회복되었다. 해산어 양식장에서 옥소린산의 빈번한 사용은 옥소린산에 대한 세균의 내성을 증가시키는 것으로 관찰되었다.

      • KCI등재

        해산어 양식환경하의 미생물군집에 대한 옥소린산의 영향

        윤덕현,김무찬 해양환경안전학회 2006 海洋環境安全學會誌 Vol.12 No.2

        이 연구는 해산어 양식장 환경을 재현한 해양 microcosm을 이용하여, 양식장에서 빈번히 사용하고 있는 옥소린산에 대한 미생물이 나타내는 항생제 내성획득에 관해 알아보고자 하였다. 옥소린산 처리 전과 후의 세균상을 비교한 결과, 비브리오 과 세균은 실험기간 전반에 걸쳐 65-75% 정도로 우점하였으며, 그람양성세균인 Micrococcos sp. 와 Bacillus sp. 는 옥소린산 처리 기간 중에 출현 빈도가 증가하였다. 해산어양식 환경에서 세균의 ETS 활성은옥소린산 처리 기간중 42-67%로 줄어들었지만, 옥소린산의 처리가 종료된 후에 세균은 다시 회복되었다. 해산어 양식장에서 옥소린산의 빈번한 사용은 옥소린산에 대한 세균의 내성을 증가시키는 것으로 관찰되었다. The microbial response after treatment of antibiotics was studied for investigating the resistance pattern under simulated aquaculture environment. A marine microcosm was developed for marine fish farm environment using artificial seawater and sediment. Oxolinic acid, which has been commonly used in aquaculture, was employed for the experiment. Resistance patterns and the changes of microbial community were monitored before. during and after use of oxolinic acid. Vibrionaceae was the dominant bacterial species throughout the experiment, consisting 65-75% of total bacterial number in fish farm environment. However, some gram-positive bacteria, Micrococcos sp. and Bacillus sp. strains in marine farm environment were increased in proportion to their number during the treatment. ETS activity of the bacterial communities in aquaculture environment was reduced to 42-67% during the treatment of oxolinic acid. But recovering trends of bacterial number were also detected immediately after cease of oxolinic acid treatment. Frequent treatment of oxolinic acid under the simulated fish farm environment showed bacterial resistance to increase sharply.

      • KCI등재

        해양환경에서 부유물질, 염분 및 pH의 옥소린산 화학적 거동에 미치는 영향

        윤덕현,김무찬 해양환경안전학회 2006 海洋環境安全學會誌 Vol.12 No.2

        해양환경에서 오염물질의 거동은 화학적 특성뿐 아니라 부유물질 표면의 정전하, pH 및 염분과 같은 환경 인자에 크게 영향을 받을 것이다. 이 연구는 해산어 양식장에서 빈번히 사용하고 있는 항생제인 옥소린산의 거동이 여러 종류의 부유물질, 염분 및 pH에 따라 어떻게 변동하는가를 HPLC에 의한 화학적 분석과 bioassay 분석으로 검토하였다. 부유물질의 농도가 증가할수록 옥소린산은 HPLC 분석에 의해서도 저농도로 검출되었고, 생물활성에 의한 bioassay 분석으로도 현저히 감소하는 것으로 나타났다. 이 결과는 부유물질이 옥소린산을 흡착하여 수서환경에서 제거하는 역할을 한다는 것을 알 수 있다. 그리고 옥소린산은 염분 40%o과 pH 7에서 bioassay 분석에 의해 생물활성이 약간 저해되지만 HPLC 분석은 조금 다른 양상을 보였다. The fate of chemical pollutants in the aquatic environment is generally considered to be strongly influenced by environmental factors such as pH, salinity and electrostatic charges on the surface of particles ai well as by the characteristic of chemicals. Oxolinic acid was measured by chemical analysis using HPLC to determine the effect of salinity, pH and suspended solids on chemical binding and by bioassay for measuring bioactivity. The higher contentration of suspended solids in the medium, the lower concentration of oxolinic and was detected in measurements from by both HPLC and biosssay analysis. This indicates particle may have a stronger binding or absorption effect on oxolinic acid. Bioassay analysis showed weaker bioacivity at higher salinity and pH 7.0, but this result of bioassay analysis was different from the result of HPLC.

      • KCI등재

        Percutaneous Management of a Bronchobiliary Fistula after Radiofrequency Ablation in a Patient with Hepatocellular Carcinoma

        윤덕현,심주현,이욱진,김표년,신지훈,김강모 대한영상의학회 2009 Korean Journal of Radiology Vol.10 No.4

        Radiofrequency ablation (RFA) is a minimally invasive, image-guided procedure for the treatment of hepatic tumors. While RFA is associated with relatively low morbidity, sporadic bronchobiliary fistulae due to thermal damage may occur after RFA, although the incidence is rare. We describe a patient with a bronchobiliary fistula complicated by a liver abscess that occurred after RFA. This fistula was obliterated after placement of an external drainage catheter into the liver abscess for eight weeks.

      • KCI등재

        성인 T세포림프구성림프종에 시행한 VPDL 항암화학요법: 단일기관에서 시행한 자가조혈모세포이식과의 비교

        윤덕현,손병석,이욱진,임성남,김은경,박인근,김경민,장근두,김신,이대호,허주령,서철원 대한혈액학회 2008 Blood Research Vol.43 No.3

        Background: Treatment of T-cell lymphoblastic lymphoma (T-LBL) with CHOP or CHOP-like chemotherapy has resulted in poor long-term outcomes. High-dose chemotherapy followed by ASCT has been applied for this dreaded disease. However, the efficacy is still controversial. T-LBL is considered the nodal/extranodal presentation of acute lymphoblastic leukemia. Favorable results with VPDL chemotherapy have been reported in the setting of adult lymphoblastic leukemia. We, therefore, treated T-LBL patients with modified VPDL chemotherapy and compared the outcomes with those achieved using upfront ASCT. Methods: We retrospectively reviewed the outcomes of 24 T-LBL patients treated either with upfront ASCT (n=11) or VPDL chemotherapy without ASCT (n=13) between January 1996 and October 2005. Results: The median follow-up duration for surviving patients was 17 months (range, 5∼109 months). The two-year event-free survival (EFS) rates were 83.1% in the VPDL group and 27.3% in the upfront ASCT group (P=0.008). The two-year overall survival (OS) rates were 83.9% in the VPDL group and 27.3% in the upfront ASCT group (P=0.006). Conclusion: This study suggests that VPDL chemotherapy is very effective and may be superior to upfront ASCT in the treatment of T-LBL patients.

      • Induction Chemotherapy with S-1 and Cisplatin in Patients with Locally Advanced Squamous Cell Carcinoma of the Head and Neck : A Single Center Experience

        윤덕현,조유진,김지연,김상윤,남순열,최승호,노종렬,이상욱,이정현,김재승,조경자,김성배,Yoon, Dok-Hyun,Cho, Yoo-Jin,Kim, Ji-Youn,Kim, Sang-Yoon,Nam, Soon-Yuhl,Choi, Seung-Ho,Roh, Jong-Lyel,Lee, Sang-Wook,Lee, Jeong-Hyun,Kim, Jae-Seung,Cho, The Korean Society for Head and Neck Oncology 2011 대한두경부 종양학회지 Vol.27 No.2

        서 론: 5-FU와 cisplatin 병용항암화학요법은 국소진행성 두경부편평상피암의 유도화학요법으로 널리 사용되고 있는 요법이다. 저자들은 5-FU 대신 경구제재인 S-1을 cisplatin과 병용하는 복합항암요법의 효과와 안전성에 대해 연구하였다. 대상 및 방법: 저자들은 2007년 2월부터 2008년 12월까지 S1과 cisplatin의 복합유도화학요법을 시행받은 3/4기 구인두, 하인두, 후두, 구강 편평상피세포암 환자 52명의 치료결과를 후향적으로 분석하였다. 유도항암화학요법은 제 1일에 cisplatin(75 또는 60mg/$m^2$), 제1일부터 14일까지 S-1(40mg/$m^2$)을 1일 2회, 21일 간격으로 투여하였고 가능한 경우에는 항암방사선동시요법 또는 수술을 뒤이어 시행하였다. 결 과: 전체 52명 중 37명(71.2%)에서 부분반응을 보였으나 완전반응은 관찰되지 않았다. 2년 무진행생존율은 56.9%, 2년 전체생존율은 68.2%였다. 유도항암요법과 관련된 유해반응으로는 호중구감소증(71.2%) 및 빈혈(63.5%) 등과 같은 혈액학적 부작용이 가장 흔했다. 결 론: S-1과 cisplatin의 복합항암화학요법은 국소진행성 두경부편평상피암 환자를 대상으로 한 유도화학요법으로 적용이 가능한 것으로 판단된다.

      • KCI등재

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