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Effect of Mn and C on Age Hardening of Fe–Mn–Al–C Lightweight Steels
Sung‑Won Park,Jun Young Park,Kyong Mox Cho,Jae Hoon Jang,Seong‑Jun Park,Joonoh Moon,Tae‑Ho Lee,Jong‑Ho Shin 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The effects of Mn and C content on the age hardening of Fe–Mn–Al–C lightweight steels, which have austenitic or duplex(austenite and ferrite) microstructures, were investigated. An increase in Mn content induced a delay of the age hardeningthat is caused by the formation of intra-granular κ-carbides. In order to interpret the effect of Mn content, first-principlescalculations were conducted using the supercells of Fe24Al8C8,Fe24Al8C7,Fe24(Al7Mn)C8, and Fe24(Al7Mn)C7. The calculationsshowed that an increase in Mn content could be the source of the delay of the intra-granular κ-carbide formation bysuppressing C atom’ occupation of the vacancy at the body-centered site of L12. An increase in C content accelerated theformation of intra-granular κ-carbides, which induced the intense age hardening, and coarse inter-granular κ-carbides, whichresulted in significant decrease in impact absorbed energy due to inter-granular fracture.
코아-셀 구조를 가지는 전도성 폴리피롤 나노섬유를 이용한 메탄올 센서 제작
전태선 ( Tae Sun Jun1 ),이성호 ( Sung Ho Lee ),김용신 ( Yong Shin Kim ) 한국센서학회 2014 센서학회지 Vol.23 No.6
Electrically conductive polypyrrole-polyvinylpyrrolidone (PPy-PVP) nanofiber mats with a core-shell structure have been successfully fabricated by a two-step process: the formation of FeCl3-containing PVP nanofiber mat by electrospinning, and the vapor-phase polymerization (VPP) of pyrrole monomer on the mat in a sealed chamber at room temperature. Surface morphology and chemical composition of the PPy-PVP mat were characterized by SEM, EDX and FTIR analyses. The as-prepared nonwoven mat was composed of PPy-PVP nanofibers with an average diameter of 300 nm. The sheet conductivity of the nanofiber mat was measured to be approximately 0.01 S/cm by a four-point probe. We have also investigated gas-sensing properties of PPy-PVP nanofiber mat upon exposure to methanol vapor. The PPy-PVP nanofiber sensors were observed to have excellent methanol-sensing performance. The nanofiberbased core-shell nanostructure could give an opportunity to fabricate a highly sensitive and fast response sensor due to its high surfaceto-volume ratio.
소아 심장 CT 검사시 Dual Source CT의 High pitch mode를 이용한 선량감소에 관한 연구
이예나(Ya Na Lee),강헌효(Heon Hyo Kang),손성실(Sung Sil Son),박찬혁(Chan Hyuk Park),현진경(Jin Kyung Hyun),신명호(Myung Ho Shin),김준혁(Jun Hyuk Kim),강동원(Dong Won Kang) 대한CT영상기술학회 2012 대한CT영상기술학회지 Vol.14 No.1
I. Purpose This study examines if accurate images can be realized with less dose than sequential mode, one of the existing methods applying DSCT’s high-pitch mode in pediatric cardiography. II. Materials and Methods For 20 patients who came to our hospital from Jan. 1 to Jun. 30, 2011, a test was carried out using MDCT 128 channel dual source; Somatom Definition Flash (Siemens Medical System: Germany). As the test method, the veins of the lower limbs of the patients were secured and contrast medium of 7ml was injected at 0.3ml/s anda CT scan was carried out about 36 s. later. Af first, sequential mode was used, and then high-pitch mode was followed as follow-up examination. The DLP (Dose Length Product) provided by the equipment and effective dose were compared for the assessment of the dose exposed to the patients, after the CT scan. The effective does was calculated by multiplying children’s chest index: 0.021 of the effective dose rate of EUR16262 (European Guide) to DLP value. The images scaned in high-pitch method were compared and assessed quantitatively by a heart decoding specialist and 2 radiologists if the typical diseases of pediatric cardiacs such as coarctation of aorta, atresia of the pulmonary artery and Tetralogy of Fallot can be assessed. III. Results When it was compared to sequential mode, one of the existing cardiography, the effective dose exposed to the patient had decrease by 32% in high-pitch mode. As a result of a comparison with imaging assessment, it was also evaluated as a better imaging than sequential mode IV. Conclusion Pediatric Cardiography using high pitch in Dual source MDCT showed superior effects on the reduction of exposed does than sequential mode, which is considered a useful testing method. 목적 본 연구에서는 소아 심장 검사 시 DSCT의 High-pitch mode를 적용하여 기존의 검사방법 중 하나인 Sequential mode보다 적은 선량으로도 정확한 영상을 구현할 수 있는지 알아본다. 대상 및 방법 2011년 1월 1일부터 6월 30일까지 본원에 내원한 20명의 환자를 대상으로 하여 MDCT 128 channel dual source; Somatom Definition Flash(Siemens medical system: Germany) 장비를 사용하여 검사를 시행하였다. 검사방법은 환자의 하지에 정맥을 확보하고 조영제를 0.3 ml/s로 7ml를 주입한 후 36초 후에 CT검사를 하였다. 처음에는 Sequential mode로 검사한 후 추적 검사할 땐 High-pitch mode로 검사한다. 환자가 받은 피폭선량의 평가는 선량평가는 CT검사 후 장비에서 제공하는 DLP(dose length product)와 유효선량(effective dose)를 비교하였다. 유효선량은 DLP 값에 EUR16262(European Guide) 유효선량비 중 소아 흉부 지수 0,021을 곱하여 계산하였다. 검사한 영상을 심장 판독 전문의 1명과 방사선사 2명이 high-pitch mode로 검사한 영상을 소와 심장의 대표적 질환인 대동맥협착증, 폐동맥 폐쇄증, 팔로씨 사증을 평가할 수 있는지 비교하여 정성적으로 평가하였다. 결과 기존의 심장 검사방법 중 하나인 Sequential mode와 비교했을 때 High pitch mode로 검사했을 때에 32%의 선량 감소 효과가 있었다. 또한 영상 평가 비교 결과 Sequential mode 보다 좋은 영상으로 평가되었다. 결론 Dual source MDCT로 소아심장 검사를 할 때 high pitch mode를 이용하면 sequential mode로 검사했을 때보다 환아가 받는 피폭선량은 낮고 더 우수한 영상을 획득하여 심장질환을 진단하는데 유용한 검사법으로 사료된다.
실용음악 전공 학생들의 발성치료 전후 성대 및 음성 특성 비교
황연신,심미란,김철준,최용석,김상연,최찬호,선동일,Hwang, Yeon Shin,Shim, Mi Ran,Kim, Chul Jun,Choi, Yong Suk,Kim, Sang Yeon,Choi, Chan Ho,Sun, Dong Il 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.2
Background and Objectives : Many students major in applied music singing have various difficulties in phonation when they sing or perform. But the studies about this cause are lack. The purpose of this study is whether singing voice therapy based on vocal music is effective or not to applied music singing students that have difficulties in phonation. Materials and Methods : Singing voice therapy program had been done to 8 students major in applied music singing during 7 weeks. We did laryngeal stroboscope, perceptual, acoustic and aerodynamic examination before and after singing voice therapy to this students. And we studied post examination results have differences or improvements compared to pre examination results. Results : Four male students don't have effective improvement after singing voice therapy but they shows slight improvement in aerodynamic examination values compared to pre examination values. Four female students shows improvement in aerodynamic examination values and pitch range increasing. Above all, one student's vocal nodules disappeared after singing voice therapy. Conclusion : Singing voice therapy based on music singing is very effective to the students major in applied music singing. Above all, their curriculum in applied music singing should include phonation training based on music singing before training perform and technic practices.
Detection of BCR/ABL mRNA by Polymerase Chain Reaction in Hematologic Diseases
Shin, Sang Won,Kim, Byung Soo,Kim, Yeul Hong,Kim, Jun Suk 고려대학교 의과대학 1996 고려대 의대 잡지 Vol.33 No.2
The BCR/ABL translocation characteristic of chronic myelogenous leukemia (CML) was detected by polymerase chain reaction (PCR) modified to use as mRNA as the starting materials. Amplification of a sequence spanning the BCR/ABL junction was obtained by using peripheral blood cells from 12 patients with CML, 4 patients with acute myelogenous leukemia, 4 patients with acute lymphocytic leukemia, 2 patients with myelodysplastic syndrome, and K562 cell line. The presence of BCR/ABL mRNA was determined from the size of the amplified sequence and it was present in all 12 patients with CML. We could not detect BCR/ABL mRNA in other hematologic diseases. One leukemic cell per 1,000 nonleukemic cells could be detected, thus indicating the great sensitivity of the method. This technique is a useful tool in CML both for diagnosis and detection of minimal residual disease.
A survey of patients' perspectives of steroid injection (ppyeojusa) in Korea
Shin, Bo-Mi,Hong, Sung Jun,Lim, Yun Hee,Jeong, Jae Hun,Moon, Ho Sik,Choi, Hey Ran,Park, Sun Kyung,Han, Richard Jin Woo,Kim, Jae Hun The Korean Pain Society 2019 The Korean Journal of Pain Vol.32 No.3
Background: Steroid injections are commonly used in pain clinics to relieve pain and treat inflammation. In Korea, these steroid injections are well known as 'ppyeojusa', which means to inject into the bone in Korean. Some patients often have a negative perception of this treatment method due to inaccurate information about the treatment and side effects of steroids. The purpose of this study is to investigate patients' perception and knowledge of ppyeojusa. Methods: A questionnaire about ppyeojusa was completed by patients who visited one of the pain clinics in nine university hospitals, from August 1 to September 10, 2017. Results: Three-hundred seventy-four patients completed the survey. Eighty-five percent of patients had had ppyeojusa, and 74% of the respondents had heard of ppyeojusa from the mass media, friends or relatives. Only 39% of the patients answered that this injection was safe without side effects if properly spaced. Of the patients surveyed, 21% responded that ppyeojusa are "injections into the bone"; while 15% responded that ppyeojusa are "terrible injections that melted 'the bone if used a lot'". Half of the patients did not know what the active constituent is in ppyeojusa. If steroid injections are advised by the pain specialists, 89% of the patients would consent. Conclusions: Most pain clinic patients have heard of ppyeojusa. Most patients obtained information about ppyeojusa from mass media, rather than their physicians. Therefore, it is likely that most patients have inaccurate knowledge.