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1 ton steam/hr 수관식 보일러에서의 합성가스 혼합 연소 특성 연구
최신영(Sin-Young Choi),양동진(Dong-Jin Yang),방병열(Byung-ryul Bang),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Combustion characteristics of co-combustion of heavy-oil fuel and syngas was investigated by measuring the temperature and gas-species such as CO, NOx, and O₂ in a water tube boiler furnace. Syngas was made up by mixing H₂ and CO in a small mixing chamber to maintain the desired concentrations. Experiments were performed in the condition of 600,000kcal/h heat capacity and 4% O₂ concentration at the exit of the furnace. Though only one experimental case was done in the co-combustion experiments, outstanding effect of adding the syngas as a auxiliary fuel is that the NOx concentration decreases and CO concentration increases because of temperature rising in the furnace and this result is same as the basic conflicting combustion characteristics of NOx and CO due to temperature rising or decreasing.
유기인계 농약 중독환자에서 기계환기 필요성에 대한 예측인자 분석
박동찬 ( Dong Chan Park ),박정배 ( Jung Bae Park ),김윤정 ( Yun Jeong Kim ),신수정 ( Soo Jeong Shin ),문유호 ( You Ho Mun ),박신률 ( Sin Ryul Park ),류현욱 ( Hyun Wook Ryoo ),서강석 ( Kang Suk Seo ),정제명 ( Jae Myung Chung ) 대한임상독성학회 2010 대한임상독성학회지 Vol.8 No.2
Purpose: The purpose of this study is to investigate the factors that predict using mechanical ventilation for patients with organophosphate intoxication. Methods: We retrospectively reviewed the medical records of 111 patients with acute organophosphate intoxication and who were treated in our emergency center from January 2000 to December 2008. We compared the toxicologic characteristics, the laboratory findings and the APACHE II scores between the Mechanical Ventilation group (MV group) and the non-Mechanical Ventilation group (the non MV group). Results: Sixty three patients were in the MV group and 48 patients were in the non MV group. In the MV group, the patients had an older age (p<0.001), a larger amount of ingestion (p<0.001), a lower initial serum cholinesterase level (p=0.003), a higher APACHE II score (p<0.001) and they ingested a more toxic agent (p=0.001). There were no significant differences in gender, the type of visit and the arrival time between the MV group and the non MV group. Conclusion: We suggest that the patient’s age, the amount of organophosphate ingestion, the toxicity of the agent, the initial serum cholinesterase level and the APACHE II score are important factors to determine if mechanical ventilation will be applied for patients with organophosphate intoxication.
무인항공기 이미지 기반 부유사농도 점 관측자료 2D 확장
김선신(Kim, Sun-Sin),김동호(Kim, Dong Ho),유홍렬(Ryu, Hong Ryul),서승철(Seo, Seung Chul),김태균(Kim, Tai-Kyun) 한국연안방재학회 2019 한국연안방재학회 학술발표대회 논문집 Vol.2019 No.1
하천이나 해안으로 유입된 부유사는 수질 및 생태학적으로 많은 문제를 발생시키고 있어 지속적인 모니터링을 수행하고 있다. 본 연구에서는 OBS를 수면에 설치하여 관측하는 방법과 무인항공로 취득한 이미지를 분석하여 점 관측자료를 2D 관측자료로 확장하는 방법을 제시하고 적용성을 확인하였다.
( Jee Young An ),( Jae Sin Lee ),( Dong Ryul Kim ),( Jae Young Jang ),( Hwa Young Jung ),( Jong Ho Park ),( Sue Sin Jin ) 영남대학교 의과대학 2018 Yeungnam University Journal of Medicine Vol.35 No.1
A 75-year-old man with chronic cholangitis and a common bile duct stone that was not previously identified was admitted for right upper quadrant pain. Acute cholecystitis with cholangitis was suspected on abdominal computed tomography (CT); therefore, endoscopic retrograde cholangiopancreatography with endonasal biliary drainage was performed. On admission day 5, hemobilia with rupture of two intrahepatic artery pseudoaneurysms was observed on follow-up abdominal CT. Coil embolization of the pseudoaneurysms was conducted using percutaneous transhepatic biliary drainage. After several days, intrahepatic artery pseudoaneurysm rupture recurred and coil embolization through a percutaneous transhepatic biliary drainage tract was conducted after failure of embolization via the hepatic artery due to previous coiling. After the second coil embolization, a common bile duct stone was removed, and the patient presented no complications during 4 months of follow-up. We report a case of intrahepatic artery pseudoaneurysm rupture without prior history of intervention involving the hepatobiliary system that was successfully managed using coil embolization through percutaneous transhepatic biliary drainage.
장기간 지속성 외래 복막투석을 시행 받은 환자의 임상적 특성
노현정(Hyun Jung Roh),류동렬(Dong Ryul Ryu),유태현(Tae Hyun Yoo),박형천(Hyeong Cheon Park),신석균(Suk Kyoon Shin),강신욱(Sin Wook Kang),최규헌(Kyu Hun Choi),이호영(Ho Yung Lee),한대석(Dae Suk Han) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.2
지속성 외래 복막투석은 도입 된지 20여년이 경과되어 현재 널리 쓰여지는 신대체 요법으로 혈액투석과 비교하여 사망률 면에서는 별 차이가 없으나 낮은 기술적 생존률로 인해 장기간 시행하기가 어려운 것으로 되어 있다. 본 연구에서는 국내의 장기 복막투석 환자들을 대상으로 장기 복막투석을 위한 요건과 투석 중 임상 양상의 변화를 조사하고자 하였다. 1981년 11월부터 1999년 3월까지 연세의료원에 내원하여 복막투석을 시행 받은 환자 중 10년 이상 복막투석을 시행 받은 환자 23명을 장기투석군으로 설정하였고, 이와 대조군인 단기투석군으로는 복막투석을 시행 받은 환자 23명을 장기투석군으로 설정하였고, 이와 대조군인 단기투석군으로는 복막투석 시작 후 4년 이내에 혈액투석으로 전환한 환자 22명과 4년 이내에 사망한 환자 41명을 대상으로 하여 후향적으로 분석하였다. 모든 환자에서 복막투석 시작 당시와 복막투석 시작 후 18개월간의 임상적 특성 및 체중, 생화학적검사 결과를 조사하였다. 장기 복막투석환자를 대상으로는 2년마다 추적 검사한 체중, 생화학적검사 결과를 조사하였다. 1) 평균 투석기간은 장기투석군 129.9±8.3개월, 혈액투석 전환군 20.2±11.1개월, 사망자군 18.9±14.7개월이었다. 2) 투석 시작 연령은 장기투석군 39.7±12.4세, 혈액투석 47.7±12.2세, 사망자군 60.9±13.8세로 장기 투석군의 연령이 낮았다. 당뇨병의 유병률은 장기 투석군 4.3%(1/23명), 혈액투석 전환군 31.8%(7/22명), 사망자군 61.0%(25/41명)으로 혈액투석 전환군과 사망자군에서 높았으며, 심혈관계 질환의 합병률은 장기투석군 4.3%(1/23), 혈액투석 전환군 4.5%(1/22), 사망자군 34.1%(14/41)로 역시 사망자군에서 높았다. 성과 체중에 따른 차이는 없었다. 3) 투석 시작 당시 혈청 creatinine은 장기투석군 16.7±6.2mg/dL, 사망자군 8.4±3.6mg/dL였고, 혈청 알부민은 장기투석군 3.5±0.6g/dL, 혈액투석 전환군 3.3±0.6g/dL, 사망자군 3.2±0.6g/dL, 로 장기투서군에서 유의하게 높았다. 4) 18개월간 세 군의 체중은 큰 변화가 없었으나 남자 사망자군은 18개월경 급격한 체중 감소가 있었고, 혈청 크레아티닌과 알부민은 세 군에서 모두 증가하였으나 장기투석군에서 더 현저하였다. 5) 10년간 장기 투석 환자를 추적 검사한 결과 체중은 여자 환자에서 처음 2년간 급속히 증가하였고 그 이외는 남녀 모두에서 큰 변화가 없었다. BUN, 혈청 크레아티닌, 알부민은 투석시작 후 2-4년까지 증가하다가 그 이후부터 서서히 감소하는 양상을 보였다. 결론적으로 단기 투석 환자군과 비교하여 장기 투석 환자는 젊은 연령에서 투석을 시작하였고 당뇨병, 심혈관계 질환력이 적으며 투석 시작 당시 영양학적 지표가 양호하였다. 또한 장기간 복막투석을 시행할 경우 투석 시작 후 4-6년경부터 영양학적 지표가 서서히 악화되기 시작하여 이시기부터 영양 상태의 개선을 위한 노력이 필요할 것으로 생각된다. Although CAPD has become firmly established as an effective mode of renal replacement therapy, it's technique survival rate is much inferior compared to hemodialysis. To date, few patients have been main- tained on this therapy for more than 10 years. To gain insights into clinical features of patients who had maintained over 10 years on CAPD in Korea, we retrospectively compared 23 patients who survived more than 10 years on PD(Long-term survivors, LTS) and 63 patients who died(Short-term survivors, STS-died, 41 patients) or changed to hemodialysis(STS-HD, 22 patients) within 4 years of initiating PD. For all patients, age, sex, diabetic history, prior cardiac events, body weight and biochemical profiles were analyzed. 1) The LTS were younger(39.7±12.4 vs. 47.7± 12.3 vs. 60.9±13.8 years) compared with STS-HD and STS-died. 2) The LTS had less cases of DM(4.3% vs. 31.8 % vs, 61%), and had less cases of prior cardiac events(4.3% vs. 4.5% vs, 34.1%) compared with STS-HD and STS-died. Sex ratio and body weight were comparable in three groups. 3) At the initiation of PD, the LTS had higher serum creatinine(16.7rng/dL vs. 12.4mg/dL vs, 8.4mg/ dL), albumin(3.53g/dL vs. 3.27g/dL vs, 3.20g/dL) lev- els compared with STS-HD and STS-died. 4) During 10 year CAPD treatment, LTS showed relatively stable body weight except the increase of body weight for the first 2 years in female. BUN, creatinine, protein, albumin constantly increased for the first 4 years, and then started to decline by 4 th to 6 th years. In conclusion, young age, non-diabetic history, less prior cardiac events and good nutritional status can predict the long-term survival on peritoneal dialysis. The evaluation of nutritional status and nutritional support by 4 th to 6 th years may be important in maintaining long-term survival in CAPD patients.
Comparison of Different Vehicles on Human Embryonic Stem Cells using Vitrification
Lee, Jae-Ho,Kim, Gi-Jin,Kim, Sin-Ae,Lee, Won-Woo,Lee, Hey-Jin,Lee, Dong-Ryul,Chung, Hyung-Min The Korean Society of Animal Reproduction 2006 Reproductive & developmental biology Vol.30 No.4
Vitrification has been suggested to be an effective method for the cryopreservation of human ES cells. However, the efficiency of vitrification with different vehicles remains a matter of ongoing controversy. The objective of this study was to assess the efficiency of cryopreservation in human ES cells by vitrification using different vehicles. A human ES cell line and a variety of vehicles, including micro-droplet (MD), open-pulled straw (OPS) and electron microscopic grid (EM-grid), were employed in an attempt to assess vitrification efficiency. In order to evaluate the survivability and the undifferentiated state of the post-vitrified human ES cells, we conducted alkaline phosphatase staining and characterization via both RT-PCR and immunofluorescence assays. The survival rates of the post-vitrified human ES cells using MD, OPS and EM-grid were determined to be 61.5%, 66.6% and 53.8%, respectively. There also exist significant differences between slow-freezing and vitrification (p<0.01). However, no significant differences were detected between the vehicle types. Finally, the pluripotency of human ES cells after thawing was verified by teratoma formation. Cryopreservation using vitrification is more effective than slow-freezing, and the efficiency of vehicles proved effective with regard to the preservation of human ES cells.