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Efficacy of VapormateTM, methyl bromide alternative fumigant, against Tetranychus urticae
Hyeon Kyu Jang,Hyun Sik Rho,Byung-Ho Lee,Chung Gyoo Park 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
VapormateTM, the new gas formation of ethyl formate(EF) with carbon dioxide, is an MB(methyl bromide) alternative fumigant for grains and perishable commodities especially to control quarantine pest. To gain systematic efficacies of VapormateTM, vaporized gases in Tedlar bag were collected from liquefied gases in cylinder. Vaporized gases were used for collecting efficacy data to Tetranychus urticae, two-spotted spider mite, for 6hr at 26± 1℃. When applied 25, 51, 77 and 102 ml/L of vaporized gas for 6hr, mortality of T. urticae female adult were 83.3, 97.8, 100, and 100%, respectively, at 24hr after fumigation. Also, at 77 and 102 ml/L of vaporized gas for 4hr treatment at 26± 1℃, the mortality of T. urticae female was 96.7 and 97.8%, respectively. This preliminary result may help to understand further scaled-up VapormateTM fumigation applied with different type of commodities.
Jang, A-Rang,Lee, Young-Woo,Lee, Sang-Seok,Hong, John,Beak, Seong-Ho,Pak, Sangyeon,Lee, Juwon,Shin, Hyeon Suk,Ahn, Docheon,Hong, Woong-Ki,Cha, SeungNam,Sohn, Jung Inn,Park, Il-Kyu Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.17
<P>Chemical doping is one of the most effective methods to tune the electrochemical properties of graphene. We report a simple and relatively low-temperature process for the fabrication of boron doped graphene by using a spin-on dopant (SOD) method. SOD-treated graphene was successfully doped with boron atoms at a temperature lower than 600 °C. The fabricated boron doped graphene exhibits a specific capacitance of 4 mF cm<SUP>−2</SUP>, as well as a high-rate performance of 91.9% at 200 mV s<SUP>−1</SUP> as an electrode material for pseudocapacitors. It also shows excellent oxygen reduction activity and durability with a current retention of 91.4% and methanol-tolerance properties. These features are beneficial for catalyst applications in the oxygen reduction reaction due to well-engineered boron sites with high electrical conductivity and many active sites for electrochemical reactions.</P>
In vitro characterization of human dental pulp stem cells isolated by three different methods
Jang, Ji-Hyun,Lee, Hyeon-Woo,Cho, Kyu Min,Shin, Hee-Woong,Kang, Mo Kwan,Park, Sang Hyuk,Kim, Euiseong The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.4
Objectives: In this study, we characterized human dental pulp cells (HDPCs) obtained by different culture methods to establish the most suitable methodology for dental tissue engineering and regenerative endodontic applications. Materials and Methods: HDPCs were isolated by the outgrowth method (HDPCs-OG), the enzymatic digestion method (collagenase/dispase/trypsin, HDPCs-ED), or the combination of both methods (HDPCs-Combined). The expression of mesenchymal stem cell markers (CD105, CD90, and CD73) was investigated. In vitro differentiation capacities of HDPCs into adipogenic, osteogenic, and chondrogenic lineages were compared. Differentiation markers were analyzed by quantitative reverse-transcription polymerase chain reaction (RT-PCR) and western blotting. Results: Our data indicated that whole HDPCs-ED, HPDCs-OG, and HDPCs-Combined could be differentiated into adipogenic, chrondrogenic, and osteogenic cell types. However, we found that the methods for isolating and culturing HDPCs influence the differentiation capacities of cells. HDPCs-OG and HDPCs-ED were preferably differentiated into adipogenic and osteogenic cells, respectively. Differentiation markers shown by RT-PCR and western blotting analysis were mostly upregulated in the treated groups compared with the control groups. Conclusions: Our findings confirmed that cell populations formed by two different culture methods and the combined culture method exhibited different properties. The results of this study could provide an insight into regenerative endodontic treatment using HDPCs.
Hyeon Jang Jeong,Ji Soo Lee,Young Kyu Kim,Sung-Min Rhee,Joo Han Oh 대한견주관절의학회 2023 대한견주관절의학회지 Vol.26 No.3
Background: The transosseous anchorless repair (ToR) technique was recently introduced to avoid suture anchor-related problems. While favorable outcomes of the ToR technique have been reported, no previous studies on peri-implant cyst formation with the ToR technique exist. Therefore, this study compared the clinical outcomes and prevalence of peri-implant cyst formation between the ToR technique and the conventional transosseous equivalent technique using suture anchors (SA). Methods: Cases with arthroscopic rotator cuff repair (ARCR) between 2016 and 2018 treated with the double-row suture bridge technique were retrospectively reviewed. Patients were divided into ToR and SA groups. To compare clinical outcomes, 19 ToR and 57 SA cases with¬out intraoperative implant failure were selected using propensity score matching (PSM). While intraoperative implant failure rate was analyzed before PSM, retear rate, peri-implant cyst formation rate, and functional outcomes were compared after PSM. Results: The intraoperative implant failure rate (ToR, 8% vs. SA, 15.3%) and retear rate (ToR, 5.3% vs. SA, 19.3%) did not differ between the two groups (all P>0.05). However, peri-implant cysts were not observed in the ToR group, while they were observed in 16.7% of the SA group (P=0.008). Postoperative functional outcomes were not significantly different between the two groups (all P>0.05). Conclusions: The ToR technique produced comparable clinical outcomes to conventional techniques. Considering the prospect of potential additional surgeries, the absence of peri-implant cyst formation might be an advantage of ToR. Furthermore, ToR might reduce the medical costs related to suture anchors and, thereby, could be a useful option for ARCR.
Jang, Ni-Hyeon,Shin, Min-Chul,Kim, Youn-Jung,Kim, Chang-Ju,Chung, Joo-Ho,Seo, Jung-Chul,Kim, Ee-Hwa,Kim, Kyu-Yeol,Lee, Choong-Yeol,Kim, Kyeong-Mi WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-
The protective effect of Acanthopanax senticosus (AS) against ethanol (EtOH)-induced apoptosis of the human neuroblastoma cell line SK-N-MC was investigated via 3-(4,5-dimothylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometric analysis, DNA fragmentation assay, reverse transcription-polymerase chain reaction (RT-PCR), and caspase-3 assay. It was shown that cells treated with EtOH exhibit classical apoptotic features, while cells pre-treated with Acanthopanax senticosus prior to EtOH exposure showed decreased occurrence of apoptotic features. In addition, Acanthopanax senticosus pre-treatment was shown to inhibit EtOH-induced increase in caspase-3 mRNA expression and activity. These results suggest that Acanthopanax senticosus may exert a protective effect against EtOH-induced apoptosis of human neuroblastoma cells.
Comparison of Stress Assessment Tools for Human Error Prevention
Kyu-Jeong Han,Tong-il Jang,Hyeon-Kyo Lim 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.11
Objective: 본 연구의 목적은 사고예방이라는 측면에서, 근로자들의 직무 스트레스를 평가하기 위하여 활용되고 있는 평가도구들이, 휴먼에러예방이라는 측면에서도 활용될 수 있는가를 인간공학적으로 검토하는 것이다. Background: 직무 스트레스는 업무의 생산성을 저하시키고, 휴먼에러의 가능성을 높이며, 나아가 산업재해를 발생시킬 수 있다. 그동안 직무 스트레스는 여러 연구분야에서 연구되었고 여러 평가도구들이 개발되어 왔다. 그러나, 그 대부분들은 산업보건, 또는 산업위생 측면에서 논의되어 온 것이며, 특히 최근에는 정신건강적 측면에서 중요성도 부각되고 있다. 그러나, 산업안전 측면에서는 사고를 야기시킬 수 있는 휴먼에러의 예방을 위해 인간공학적 측면에서 검토해 볼 필요성이 있다. Method: 본 연구에서는 직무 스트레스를 평가하는 데 활용되고 있는 국내외 여러 가지 평가도구들을 수집하였다. 여기에는 HSE가 개발한 Stress Management Competency Indicator Tool (2009)와 Management Standards Indicator Tool(2008), Karasek이 개발한 Job Content Questionnaire (1998), Belkic가 개발한 Occupational Stress Index(2003) 등을 비롯 10여 가지의 평가도구들이 포함되었다. 수집된 도구들은 개발목적, 평가시기, 평가자의 자격, 평가방법, 평가항목, 휴먼에러 가능성의 평가여부 등을 비교를 통해 검토하였다. Results: 평가도구들 간의 비교 분석한 결과, 대부분의 평가도구들이 스트레스의 장기적, 정신건강 영향에 초점을 맞추고 있어 휴먼에러 가능성의 변화를 반영하기에는 무리가 있다고 판단되었다. 다만, 근년에 개발된 평가도구들은 대체로 리스크평가 형식을 갖추고 있었는데, 이것은 유럽의 PRIMA-EF의 영향이라고 생각되었다. 사고발생 가능성과의 연관성을 두고 개발된 평가도구로는 일본의 연구결과가 유일하였다. Conclusion: 휴먼에러 가능성의 변화 여부를 파악하는 데 기개발된 산업보건적 측면의 평가도구들을 직접 활용하는 것은 무리이며, 직무 스트레스 평가도구를 활용하려면 개별적 직무 특성에 기초한 평가도구의 개발이 불가피하다. Application: 휴먼에러 가능성의 변화를 반영하기 위해서 직무특성을 분류하고 평가항목을 도출하는 데에는 기존의 연구결과를 부분적으로 활용할 수 있다. 더욱이, 관리조직 내에 지속적 관리라는 인식을 심어주는 데에는 리스크평가 및 리스크관리 방식의 접근방법이 효과적일 것으로 예상된다.