가변 ER댐퍼의 유동장 해석에 관한 연구

홍석현(Suk-Hyun Hong),지병걸(Byoung-Kul Ji),이육형(Yuk-Hyung Lee),송준호(Joon Ho Song),박명관(Myeong-Kwan Park) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11

This paper presents study of the flow-field analysis of a semi-active variable eletrorheological(ER) damper. We obtain the data through damper test and two-dimension flow analysis. It have been made a comparison between of the experiment and simulation on the variable ER damper's behavior, so it have been introduced superior to ER damper vibration-control.

가변 ER댐퍼의 유동장 해석에 관한 연구

홍석현(Suk-Hyun Hong),지병걸(Byoung-Kul Ji),이육형(Yuk-Hyung Lee),송준호(Joon Ho Song),박명관(Myeong-Kwan Park) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

2차와 3차 병원에서 외상 치료의 적정성 비교

홍석현 ( Suk Hyun Hong ),한갑수 ( Gap Su Han ),정상헌 ( Sang Hun Jung ),전정민 ( Chung Min Chun ),최성혁 ( Sung Hyuk Choi ),이성우 ( Sung Woo Lee ),홍윤식 ( Yun Sik Hong ) 대한외상학회 2005 大韓外傷學會誌 Vol.18 No.1

본 연구에서는 응급처치 및 중환자 처치 능력의 확충이 중증 외상환자 치료에 미치는 영향을 알아보고자 두 기간 동안 대도시의 3차 병원과 중소도시의 2차 병원에서 외상치료의 적정성을 비교하였다. 응급 및 중환자 처치 능력의 확충 이후, 2차 병원은 타 병원으로의 전원 없이도 중증 외상 환자를 치료할 수 있게 되었으며, 생리학적 외상 치료 능력이 향상되어 보다 정확한 외상 치료가 가능해 졌다. 비록 특별하게 고안된 외상 센터가 아니라 하더라도, 잘 구축된 응급 의료 체계하에서 지역별로 응급 및 중 환자 처치 능력을 강화하면 외상 환자 치료 성적을 향상 시킬 수 있을 것이다. Background: This study compared the performance of trauma care in an urban and a suburban hospital before and after the enhancement of emergency and intensive care. Method: The medical records of patients who were admitted to the intensive care unit following trauma from 1994 to 1995 and from 2002 to 2003 were examined. The standardized W (Ws), the 95% confidence interval (CI) of the Ws, and the predicted survival rate (Ps) were calculated. During each period, each hospital`s actual survival rate was compared with the 95% CI of the Ps according to the revised trauma score (RTS) and injury severity score (ISS). Spell out RTS and ISS. Result: From 1994 to 1995, 225 and 121 records from the urban and the suburban hospitals were reviewed, respectively. The 95% CI`s of the Ws were -2.30 to 2.73 and -11.40 to -5.90, respectively. The actual survival rate of the suburban hospital was significantly lower than the predicted survival rate at all RTS. From 2002 to 2003, 315 and 268 records from the urban and the suburban hospitals were reviewed, respectively. The 95% CI`s of the Ws was -3.56 to 0.24 and -3.73 to 0.26, respectively. There was no difference between the actual survival rate and the predicted survival rate. Conclusion: An enlargement of the capacities of emergency and intensive care may improve the performance of trauma care at a small suburban hospital.

MDCT를 이용한 복부 3-phase검사시 추적검사환자의 피폭선량 감소를 위한 Bolus triggering에 대한 고찰

민철홍(Chul Hong Min),이성현(Sung Hyun Lee),홍석현,강홍규(Hong Gu Kang),정민(Myun Jang),김기원(Ki Won Kim),김창남(Chang Nam Kim),Jang Suk Han 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

Purpose In this study, number of monitoring time is examined when Bolus triggering is applied to determine examination time according to circulation of blood for 3-phase examination to reduce exposure dose during monitoring among CTDIvol to patients. Materials and Methods The research was conducted from January 2007 to May 2007 toward 339 in-patients conducted Liver, Pancreas Protocol CT examination and patients were analyzed by disease, sex and age. 16MDCT (Somatom Sensation 16, Siemens, Germany) and Auto injector(Stellant, Medrad, U.S.A) were used for as experimental equipment and contrast medium was injected through Antecubital vein(elbow). 20G(needle) was used, monitoring location was Thoracic spine 12 by 1 second interval to examine peak time of each individual. 350mg I/ml 120cc contrast medium was injected with 3cc per second and monitoring conditions were 120 kV, 20mAs, detector collimation is 16×0.75mm. Results When analyzed by disease, sex and age, regular monitoring number was unable to find but for identical tracking examination conducted toward 35 people, 17 people had identical monitored number. Among 18 unidentical people, 17 people had ±3 times and only 1 person had 6 times different due to changed IV location and Flow rate. Conclusion Monitored number analysis was applied to experiment result and average was 9.4 times CTDIvol 39.12mGy. As minimum monitored number was 2, monitoring start time was 2 seconds after enhance to reduce CTDIvol to 8.32mGy. Also in case of follow-up patients, as error range is ±3sec, monitoring number data is recorded and managed with OCS Warning System to reduce average numbers from 9.4 times to 6 times resulting reduction of 28.96mGy that is 3 time exposure dose CTDIvol of single phase examination.

디지털 ER댐퍼에 관한 연구

지병걸(Byoung-Kul Ji),홍석현(Suk-Hyun Hong),이육형(Yuk-Hyung Lee),류춘희(Chun Hea Yoo),박명관(Myeong-Kwan Park) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

하수처리 : 지르코늄페라이트를 이용한 인제거

신정필 ( Jeoung Pil Shin ),전양근 ( Yang Kun Chun ),고인범 ( In Beom Ko ),송종민 ( Jong Min Song ),홍석현 ( Suk Hyun Hong ),윤성동 ( Seoung Dong Yoon ) 한국물환경학회 ( 구 한국수질보전학회 ) 2009 공동 추계학술발표회 Vol.2009 No.-

감염성 슬관절염의 관절경적 치료 이후 예후 인자에 대한 분석

강상우(Sang-Woo Kang),최의성(Eui-Sung Choi),김동수(Dong-Soo Kim),정호승(Ho-Seung Jung),홍석현(Seok-Hyun Hong),고반석(Ban-Suk Go) 대한정형외과학회 2019 대한정형외과학회지 Vol.54 No.1

목적: 관절경적 수술을 시행받은 감염성 슬관절염 환자들에서 성별, 나이, 기저질환, 증상 발생 후 수술까지 걸린 기간, 발병 전 침습적 시술의 시행 여부, 관절 천자액의 세균 배양, Gächter 분류를 통한 세균 감염의 정도가 치료 예후에 미치는 영향에 대해 알아보고자 한다. 대상 및 방법: 2014년 6월부터 2016년 12월까지 감염성 슬관절염으로 관절경적 수술을 시행받은 51명의 환자를 대상으로 하였으며, 평균 추시 기간은 14.2±2.1개월(12-20개월)이었다. 남자가 27명(52.9%), 여자가 24명(47.1%)이며, 평균 나이는 55.1±17.6세(13-84세)였다. 수술 전 시행한 관절 천자검사상 백혈구 수가 50,000개 이상, 다형핵 백혈구 수의 비율이 95% 이상인 환자를 감염성 슬관절염으로 진단하고 수술을 시행하였다. 모든 환자에서 관절경적 수술과 수술 후 지속적인 관절 세척을 시행하였다. 결과: C-반응 단백의 초기 평균 수치는 9.55±6.76 mg/dl (1.51-31.06 mg/dl)에서 최종 평균 수치는 0.74±1.26 mg/dl (0.08-6.77 mg/dl)로 감소하였으며, 평균 C-반응 단백의 정상화 기간은 27.6±18.9일(8-93일)이었다. 관절경적 수술과 항생제 사용 후 발열, 동통, 부종 등의 임상증상이 호전되고 C-반응 단백의 수치가 0.5 mg/dl 이하로 감소하여 감염성 슬관절염의 완치 판정을 받은 환자는 51예 중 44예(86.3%)이며, 최종적으로 두 번 이상의 관절경적 수술을 시행한 환자가 5예, prosthesis of antibiotic-loaded acrylic cement 후 인공관절 치환술로 전환한 환자가 2예이다. 결론: 지금까지 문헌들에서 알려진 것처럼 증상 발생 후 수술까지 걸린 기간과 Gächter 분류에 따른 병기는 감염성 슬관절염의 치료 성공 여부에 유의하게 영향을 주었다. 하지만 이외의 인자들은 통계적으로 유의한 상관관계가 없었다. 단 관절 천자액에서 세균이 배양된 환자군은 대조군보다 유의하게 C-반응 단백의 정상화 기간이 짧아 치료 기간을 반영하는 것으로 보인다. Purpose: This study examined the effects of gender, age, underlying disease, duration after onset of symptoms, preoperative invasive procedures, bacterial culture of joint fluid, and stage of infection by the Gächter classification on the prognosis of patients with infectious knee arthritis who underwent arthroscopic surgery. Materials and Methods: From June 2014 to December 2016, 51 patients who underwent arthroscopic surgery for infective knee arthritis were enrolled in this study. The average follow-up period was 14.2±2.1 months (range, 12-20 months). The subjects were 27 men (52.9%) and 24 women (47.1%), with an average age of 55.1±17.6 years (range, 13-84 years). A preoperative evaluation of the joint aspiration with a count of more than 50,000 leukocytes and a polymorphonuclear leukocyte count of 95% or more was performed. All patients underwent arthroscopic surgery and postoperative continuous joint irrigation. Results: The initial mean value of the C-reactive protein decreased from 9.55±6.76 mg/dl (range, 1.51-31.06 mg/dl) to a final mean of 0.74±1.26 mg/dl (range, 0.08-6.77 mg/dl); the mean duration of C-reactive protein normalization was 27.6±18.9 days (range, 8-93 days). Among the 51 patients who received arthroscopic surgery and antibiotics, 44 patients (86.3%) with infectious knee arthritis completed treatment with improved clinical symptoms, such as fever, pain, and edema, and the C-reactive protein decreased to less than 0.5 mg/dl. Finally, 5 cases were treated with two or more arthroscopic operations, and 2 cases were converted to arthroplasty after prosthesis of antibiotic-loaded acrylic cement. Conclusion: The duration of surgery after the onset of symptoms and the stage according to the Gächter classification are important prognostic factors for predicting the successful treatment of infectious knee arthritis. On the other hand, the other factors were not statistically significant. Nevertheless, patients with bacteria cultured from the joint fluids appear to reflect the treatment period because the period of normalization of the C-reactive protein is shorter than that of the control group.