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Linear Accelerator를 이용한 Stereotactic Radiosurgery
정상섭,윤도흠,오성훈,김선호,서창옥,추성실,노준규,김동익,서정호 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.6
A Modified irradiation technique utilizing a linear accelerator for radiation surgery within the brain was performed in 4 patients. Three of them had brain tumors and one small arteriovenous malformation in midbrain. A Hitchcock stereotactic apparatus and a 10 MeV linear accelerator have been adapted and special computer programs for dosimetry were obtained and studied experimentally with a phantom model. Stereotactic radiosurgery is a valuable tool in the treatment of inoperable, deep seated intracranial lesions, the major advantage being high efficacy and smoothness of the procedure, as well as short hospitalization times.
Distraction divice를 이용한 수지연장술 치험례
김수신,주훈성,김우경,정전은 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.2
The goal of reconstructive hand surgery is to maintain the normal mobile and sensory function of the hand while aesthetically be acceptable. In cases of congenital or post-traumatic shortening and loss of the digit, it is very important to achieve sufficient length of the digit with regard to functional and aesthetic aspect. The initial application of the distaction bone lengthening technique to the upper extremity reconstruction was performed by Matev(1967) for the correction of post-traumatic thumb deformities with first metacarpal lengthening. Matev and others have subsequently applied this method to congenital hand malformations and dislocations. The advantages of this method are; first, there is minimal bone resorption to the interpositional bone graft due to “bipolar nutrition”. second, normal sensibility is maintained. third, minimal sacrifice of other tissues as a donor. The authors used the Matev distraction divice to lengthen digits in 2 cases of post-traumatic shortening due to bone resorption and secondary scar contracture. By this method, we were able to maintain sufficient length of the digit so that the results were functionally and aesthetically accertable.
전상훈(Sang-Hoon Joon),추상덕(Sang-Deok Chu):오동진(Dong-Jin Oh),정원규(Won-Kyu Jung),천지현(Ji-Hyun Chun),선화연(Hwa-Yeon Sun):신형호(Hyeong-Ho Shin),한사랑(Sa-Rang Han),김광훈(Kwng-Hun Kim) 대한영상의학기술학회 2017 대한영상의학기술학회 논문지 Vol.2017 No.1
Purpose : On May 20, 2015. A man at the age of 68 was the first to be diagnosed with mers corV in korea. After a month probable 186 MERS cases had been identified in Korea uo to On June 17. and 35 healthcare workers had infected from MERS. 2 Radiographers had been infected by the 17 June. Radiographer could catch infections easily. because they had close contact with probable patients while conducting chest X-ray examinations. Because The department established a MERS infection control team and designed X-ray examination procedures based on the concept of MERS patient s risk grade. The goal of this program was to reduce the infection rate and distribute materials efficiently in the department. This article introduces the infection control and examination procedure of Radiology department during the MERS outbreak and the infection-protection experience of the department staff. Materials and Methods : Duration of MERS, We reallocated human resources in Radiology department and set a criterion of protection and flow of human traffic for operational procedures for radiographers conducting X-ray examinations on MERS patients. Result : Duration of MERS, we had examination 513 cases. but 2 radiographers who was over 37.5 had been isolated for 2 weeks, no one was infected from MERS. that is to say standards was effectiveness. Conclusion : Standards was effectiveness for MERS in National medical center 목 적 : 2015년 5월 20일 한국에서 68세 남자가 메르스 바이러스에 감염된 후 6월 17일 까지 186명의 환자가 한국에서 발생하였다. 이 중 35명의 의료진이 포함되어있고, 2명의 방사선사가 감염되었다. 검사 특성상 방사선사는 portable chest x-ray 검사 중에 환자로부터 감염 될 확률이 높다. 따라서 국립중앙의료원 영상의학과에서는 방사선사의 메르스 감염 방지를 위해 환자의 등급을 나누고 방호 기준을 설정하였다. 이번 기준설정의 목적은 방사선사의 감염 비율을 낮추고, 영상의학과 내에서 이 자료를 효율적으로 배포하기 위함이다. 이 논문은 메르스 창궐 기간 동안 영상의학과에서 감염 방지와 검사 과정 및 검사에 참여한 방사선사의 방호에 대한 경험을 다룬 것이다. 대상 및 방법 : 영상의학과 내 근무인력을 재배치 하였고, 메르스 환자 검사에 관련된 방사선사의 방호기준과 동선을 설정하였다. 결 과 : 메르스 창궐 기간동안 총 513명의 환자를 검사하였으며, 국립중앙의료원 영상의학과에서 설정한 기준에 따라서 검사에 참여한 방사선사 중 체온 37.5도 넘은 의심환자가 2명 발생했지만 감염은 없었다. 결 론 : 국립중앙의료원에서 메르스 검사를 위해 설정한 가이드라인이 직원안전에 적절했음을 알 수 있었다.
Chu, Won-Shik,Jeong, Suk-Yong,Pandey, Jitendra Kumar,Ahn, Sung-Hoon,Lee, Jae-Hoon,Chi, Sang-Cheol Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.2
The Rapid Prototyping (RP) technology has advanced in many application areas. In this research, two different types, cylinder and scaffold, of implantable Drug Delivery System (DDS) were fabricated using Nano Composite Deposition System (NCDS), one of the RP systems. The anti-cancer drug (5-fluorouracil, 5-FU), biodegradable polymer (PLGA(85: 15)), and bio ceramic (Hydroxyapatite, HA) were used to form drug-polymer composite material. Both types of DDS were evaluated in vivo environment for two weeks. For evaluation, the cumulative drug release and shape stability were measured. Test results showed that the scaffold DDS provide higher cumulative drug release and has better stability than cylinder DDS.
Smart conducting polymer composites having zero temperature coefficient of resistance.
Chu, Kunmo,Lee, Sung-Chul,Lee, Sangeui,Kim, Dongearn,Moon, Changyoul,Park, Sung-Hoon RSC Pub 2015 Nanoscale Vol.7 No.2
<P>Zero temperature coefficient of resistance (TCR) is essential for the precise control of temperature in heating element and sensor applications. Many studies have focused on developing zero-TCR systems with inorganic compounds; however, very few have dealt with developing zero-TCR systems with polymeric materials. Composite systems with a polymer matrix and a conducting filler show either a negative (NTC) or a positive temperature coefficient (PTC) of resistance, depending on several factors, e.g., the polymer nature and the filler shape. In this study, we developed a hybrid conducting zero-TCR composite having self-heating properties for thermal stability and reliable temperature control. The bi-layer composites consisted of a carbon nanotube (CNT)-based layer having an NTC of resistance and a carbon black (CB)-based layer having a PTC of resistance which was in direct contact with electrodes to stabilize the electrical resistance change during electric Joule heating. The composite showed nearly constant resistance values with less than 2% deviation of the normalized resistance until 200 C. The CB layer worked both as a buffer and as a distributor layer against the current flow from an applied voltage. This behavior, which was confirmed both experimentally and theoretically, has been rarely reported for polymer-based composite systems.</P>
Chu, Kyoung Hoon,Fathizadeh, Mahdi,Yu, Miao,Flora, Joseph R. V.,Jang, Am,Jang, Min,Park, Chang Min,Yoo, Sung Soo,Her, Namguk,Yoon, Yeomin American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>Functionalized graphene oxide (GO), derived from pure graphite via the modified Hummer method, was used to modify commercially available ceramic ultrafiltration membranes using the vacuum method. The modified ceramic membrane functionalized with GO (ceramic(GO)) was characterized using a variety of analysis techniques and exhibited higher hydrophilicity and increased negative charge compared with the pristine ceramic membrane. Although the pure water permeability of the ceramic(GO) membrane (14.4-58.6 L/m(2) h/bar) was slightly lower than that of the pristine membrane (25.1-62.7 L/m(2) h/bar), the removal efficiencies associated with hydrophobic attraction and charge effects were improved significantly after GO coating. Additionally, solute transport in the GO nanosheets of the ceramic(GO) membrane played a vital role in the retention of target compounds: natural organic matter (NOM; humic acid and tannic acid), pharmaceuticals (ibuprofen and sulfamethoxazole), and inorganic salts (NaCl, Na2SO4, CaCl2, and CaSO4). While the retention efficiencies of NOM, pharmaceuticals, and inorganic salts in the pristine membrane were 74.6%, 15.3%, and 2.9%, respectively, these increased to 93.5%, 51.0%, and 31.4% for the ceramic(GO) membrane. Consequently, the improved removal mechanisms of the membrane modified with functionalized GO nanosheets can provide efficient retention for water treatment under suboptimal environmental conditions of pH and ionic strength.</P>