냉각제어된 Fe-Si-Mn-P 고장력 강판의 미세조직 및 기계적성질

문원진,김익수,강창용,성장현,김기도 ( Won Jin Moon,Ik Su Kim,Chang yong Kang,Jang Hyun Sung ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.2

Microstructure and mechanical properties of Fe-Si-Mn-P high strength steel sheet have been investigated by controlling the cooling rate. Bainite and ferrite were obtatined by annealing in the ferrite pluse austenite region, and ferrite and austenite were obtatined after annealing in the fully austenite region. Ferrite and pearlite were obtained when the cooling rate was controlled from the annealing temperature above 760℃ and bainite showed with increasing cooling rate, however below 760℃ ferrite and bainite were obtained. Tensile strengths and hardness nearly unchanged with increasing cooling rate after control the cooling rate from the temperature above 760℃, while tensile strengths increased and elongation decreased with increasing cooling rate when the cooling rate was controlled from the tempeature below 760℃. Without regard to annealing temperature, tensile strength increased and elongation decreased with increasing cooling rate. Tensile strengths and elongation values heat treated in the ferrite plus austenite region were higher than those in the fully austenite region. Retained austenite and strength-elongation balance showed the maximum value at 780℃ and decreased with increasing annealing temperature. Strength-elongation balance value was controlled by the retained austenite.

고실 경화증 : 방사선학적 소견과 수술소견의 비교

문원진,박동우,이승로,성진용,송순영,함창곡,김용수,박충기,태경,Moon, Won-Jin,Park, Dong-Woo,Lee, Seung-Ro,Seong, Jin-Yong,Song, Soon-Young,Hahm, Chang-Kok,Kim, Yong-Soo,Park, Choong-Ki,Tae, Kyung 대한영상의학회 1998 대한영상의학회지 Vol.38 No.2

Purpose: Tympanosclerosis is a common problem causing conductive hearing loss accompanied by chronic otitismedia. The purpose of this study was to evaluate the CT findings of tympanosclerosis, and correlate them with thesurgical findings. Materials and Methods: The CT scans of 17 patients with surgically-proven tympanosclerosis andthose of a control group of 34 patients with nontympanosclerotic chronic otitis media were reviewed. According totheir location, they were assigned to one of three groups; tympanic membrane, epitympanum, or ossicles. Results:Tympanosclerosis was found during surgery to be located in the tympanic membrane (n=11), the epitympanum (n=6), oraround the ossicles(n=8). Calcification of the tympanic membrane, ossicular thickening, narrowing of theepitympanum and calcification of the tympanic cavity occurred to a significant extent, and were more often afeature of tympanosclerosis than of nontympanosclerotic chronic otitis media (p<0.05). As an indicater of tympanicmembrane involvement, sensitivity and specificity of calcification of the tympanic membrane were 73% and 83%,respectively. As an indicator of ossicular involvement, the corresponding figures for ossicular thickening were50% and 93% ; as an indicator of involvement of the tympanic cavity (especially the epitympanum) the figures fornarrowing of the epitympanum and calcification of the tympanic cavity were 50% and 50% (respective sensitivities),and 89% and 93%(respective specificities). Conclusion: Tympanosclerosis usually appears on CT as ossicularthickening, narrowing of the epitympanum, calcification of the tympanic membrane and/or tympanic cavity. CT isvery helpful in evaluating ossicular involvement and determining the appropriate surgical treatment oftympanosclerosis.

Fe-Si-Mn-P강판의 초기조직변화가 잔류오스테나이트 형성 및 인장성질에 미치는 영향

문원진,강창용,김한군,김기돈,성장현 ( Won Jin Moon,Chang Yong Kang,Han Goon Kim,Ki Don Kim,Jang Hyun Sung ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.1

This study has been conducted to investigate the effects of initial structure on the microstructure and tensile properties of high strength trip steel sheet. The initial structure before austempering remarkably influenced the second phase. The specimen with normalized initial structure showed mainly bainitic ferrite and retained austenite, while the as rolled specimen and spherodized specimen showed martensite plus retained austenite and martensite plus bainitic ferrite with small retained austenite, respectively. Two type of retained austenite, film type and granual type were observed in all specimens. The as rolled specimen appeared the highest contents of retained austenite owing to the compressive stress by cold rolling. The contents of retained austenite increased with increasing intercritical annealing temperature and austempering time. Tensile strength showed the highest in the as rolled specimen, while the highest elongation were obtained in the normalized specimen. The maximum T.S.×El. Value showed in normalized initial structure and increased with increasing intercritical annealing and austempering time. The highest Value of T.S.×El. obtained at austempering temperature of 400℃ and retained austenite of 12%.

갑상선 결절의 초음파 진단

문원진 ( Won-jin Moon ) 대한갑상선학회 2008 International Journal of Thyroidology Vol.1 No.1

Thyroid nodules are very common in clinical practice. Ultrasonography has become the first line diagnostic procedure for thyroid nodules whether being palpable or non-palpable. In this review, we discuss ultrasonographic findings to differentiate benign from malignant nodules and suggest recommendations for ultrasonography-based thyroid nodule management.

Enlarged perivascular spaces segmentation in brain MRI with a deep neural network

Shin Won Kang(강신원),Ehwa Yang(양이화),Won-Jin Moon(문원진),Yeonsil Moon(문연실),Hee-Jin Kim(김희진),Jae-Hun Kim(김재훈) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2

Enlarged perivascular space (EPVS) is one of the biomarkers of vascular brain diseases. Quantitative study of EPVS in the brain is important for understanding its associations with the disease, and for clinical diagnosis. Due to their tiny and sparse appearances together with their shared intensities with other types of brain lesions on MRI, automatic methods to detect EPVSs are strongly challenged. In this study, we employ a residual U-Net for the segmentation of basal ganglia EPVS from MRI. To assist the network’s learning in EPVS delineation, we inputted multiple MRI modality sequences to diversify the radiographic features of the EPVS provided for network training. We evaluated our method using the in-house dataset. Results show that the predicted segmentation from our network does not strictly agree with the ground truth on a pixel-by-pixel basis, however, that our method can well identify true EPVSs and has the potential for the clinical purposes of EPVS detection and quantification.

백질 손상을 받은 미숙아의 교정연령 6개월 이후 확산텐서영상

김덕수(Deok-Soo Kim),문원진(Won-Jin Moon) 대한소아신경학회 2011 대한소아신경학회지 Vol.19 No.2

목적 : 확산텐서영상은 뇌에서의 물분자가 확산되는 성질을 이용하여 대뇌백질의 구조적 변화를 평가하는 영상 기법이다. 이미 뇌손상이 있었던 미숙아에서 교정연령 6개월 이후에 시행된 확산텐서영상을 이용하여 분할비등방성과 현성확산계수를 여러 관심영역에서 얻어 이상 소견을 비교 분석하고자 하였다. 방법 : 2004년 3월부터 9월까지 미숙아로 출생하여 뇌 초음파 소견 이상이 지속적으로 관찰된 환아 중 뇌 확산텐서영상을 얻었던 7명을 대상으로 뇌초음파와 자기공명영상 소견, 임상 자료, 분할비등방도와 현성확산계수 등을 검토하였다. 뇌 자기공명영상은 교정연령 6개월에서 14개월 사이에 시행되었고 좌우측의 속섬유막 전각과 후각, 반난형 중심 상부와 하부 및 뇌량 세 영역(팽대부, 체부, 슬부)에 관심영역을 정하고 각 영역에서 분할비등방도와 현성확산계수를 구하였다. 교정연령 20개월 무렵에 평가된 조대운동지연(발달지수 60-75점)이 있는 경우로 임신주수, 자기공명영상 시행 연령과 관심영역에서의 확산텐서영상의 결과와 비교하였다. 결과 : 출생 체중의 중간값은 1,510 g (1,110-2,100 g)이고 임신주수는 27+1 - 35+6주이었다. 교정연령 20개월경에 한국형 영유아 발달검사에 의한 평가로 모두 조대운동 발달지연이 있었다. 뇌 초음파와 자기공명영상에서 상의하 낭종, 뇌실주변백질의 에코발생이나 신호강도 증가, 뇌량두께감소, 뇌실 주변백질연화증이 관찰되었다. 자기공명영상이 시행된 연령에 관계없이 속섬유막 후각이 전각보다 분할비등방도가 컸으며, 반난형 중심의 경우에는 한 명만 제외하고 상부보다 하부의 값이 컸다. 또한 뇌량에서도 한 명을 제외하고 뇌량 팽대부가 체부나 슬부에 비해 큰 분할비등방도를 보였다. 현성확산계수는 속섬유막의 경우 분할비등방도와는 반대의 현상을 보여 후각이 전각보다 값이 작았으며, 반난형 중심의 경우에는 3명을 제외하고 상부의 값이 보다 컸다. 임신주수 30주를 기준으로 이전과 이후에 분할 비등방도나 현성확산계수의 값이 비슷하였으며, 자기공명영상의 시행 연령 10개월을 기준으로 확산텐서영상 자료가 두 군에서 큰 차이가 없었다. 결론 : 대상수가 적어 통계학적인 의미를 부여할수는 없었으나, 확산텐서영상으로 표현되는 백질의 발달이 뇌손상 정도에 따라 영향을 받아 제한적인 발달을 보일 수 있으므로 확산텐서영상을 가능한 이른 시기에 반복적으로 시행할 수 있다면 신경학적이상 징후나 발달 지연을 미리 예측하는데 도움이 되리라 판단된다. Purpose : The aim of this study was to elucidate the fractional anisotrophy (FA) and apparent diffusion coefficient (ADC) of premature infants with white matter injury after six months of corrected age. Methods : Seven infants below 36 weeks of gestational age were included in this analysis. All had undergone at least two ultrasonograms which showed persistent abnormal findings related to brain injury. Brain magnetic resonance imaging (MRI) including diffusion tensor imaging (DTI) was performed after six months of corrected age. We investigated the clinical characteristics and FA and ADC in regions of interest in the seven subjects. Their gross motor function was screened by the Korean infant and child development test at around 20 months of corrected age. Results : The brain ultrasonographic findings included subependymal cyst in three, increased periventricular echogenicity in two, thinning of corpus callosum in two and periventricular leukomalacia in one subject. The conventional MRI showed periventricular leukomalacia in three, increased periventricular signal intensity in two, and thinning of corpus callosum in two subjects. FA was higher in the posterior limb of the internal capsule than in the anterior in all subjects, and in the lower centrum semiovale than in the upper part in all except one subject. ADC was higher in the anterior limb of the internal capsule than in the posterior. There was no difference in FA and ADC according to gestational age. Conclusion : DTI may be useful to detect abnormalities in deep white matter and to predict the developmental progress of the fiber tract in preterm infants with white matter injury.

알츠하이머병에서 뇌 내 철분 축적과 인지기능과의 연관성: QSMnet+를 이용한 정량적 자화감수성영상 연구

이수빈(Subin Lee),문원진(Won-Jin Moon),문연실(YeonSil Moon),임영희(Yeonghee Yim),이종호(Jongho Lee) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6

Synthesis of Li<SUB>1.6</SUB>[MnM]<SUB>1.6</SUB>O<SUB>4</SUB> (M=Cu, Ni, Co, Fe) and Their Physicochemical Properties as a New Precursor for Lithium Adsorbent

김양수(Kim, Yang-Su),문원진(Moon, Won-Jin),정순기(Jeong, Soon-Ki),원대희(Won, Dae-Hee),이상로(Lee, Sang-Ro),김병규(Kim, Byoung-Gyu),정강섭(Chung, Kang-Sup) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.10

New precursors as a Li adsorbent, Li1.6(MnM)1.6O4 (M=Cu, Ni, Co, Fe), were synthesized by hydrothermal method and their physicochemical properties were discussed. XRD and HRTEM results revealed that the original spinel structure was stabilized by cobalt-doping while Cu-, Ni- and Fe-doping led to structural changes. Such a structural stabilization by Cobalt-doping was maintained after lithium leaching by acid treatment. Li absorption efficiency from seawater was significantly enhanced by using the Cobalt-doped spinel manganese oxide, Li1.6[MnCo]1.6O4, compared to the commercially available Li1.33Mn1.67O4; the adsorbed amount of Li from 1g-adsorbent was 35 and 16 mg by Li1.6[MnCo]1.6O4, and Li1.33Mn1.67O4, respectively.

High Pressure Freezing (HPF)을 이용한 조류 Ptilota filicina의 미세구조 관찰:HPF 고정법과 화학 고정법의 비교

이상희,김윤중,정종만,김진규,김영민,권희석,문원진,이석훈,Lee, Sang-Hee,Kim, Youn-Joong,Jeong, Jong-Man,Kim, Jin-Gyu,Kim, Young-Min,Kweon, Hee-Seok,Moon, Won-Jin,Lee, Seok-Hoon 한국조류학회(藻類) 2006 ALGAE Vol.21 No.4

In preparation of the biological samples for electron microscopy, the chemical fixation by glutaraldehyde, paraformaldehyde, and OsO4 has been generally used for a long time. However, the chemical fixation method has some problems: the infiltration time is a little bit long and the ultrastructure of cell or tissue transforms before complete fixation of sample. So, recently, cryo-fixation is considered more often in biomedical field. In this study, we compared High Pressure Freezing (HPF) method with chemical fixation method using a algal sample (Ptilota filicina J. Agardh), which was difficult to fix using chemical fixation method. In chloroplast, the ultrastructure of thylakoid lamella and phycobilisome can not show clearly by chemical fixation. In this study we could observe the ultrastructure of thylakoid lamella and phycobilisome of chloroplast very clearly using HPF fixation. An improved images of ultrastructures of nucleus, mitochondrion and floridean starch could obtain. These results suggest that HPF method is very useful method in algal specimen for electron microscopy.

나노재료 연구개발 분야의 HVEM 활용

김윤중 ( Youn Joong Kim ),김진규 ( Jin Gyu Kim ),김영민 ( Young Min Kim ),문원진 ( Won Jin Moon ),정종만 ( Jong Man Jeong ) 대한금속·재료학회 2006 재료마당 Vol.19 No.6