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(Nd, Dy)-Fe-B 분말의 소결특성 및 상변화 연구
김세훈,김진우,김영도,Kim, Se-Hoon,Kim, Jin-Woo,Kim, Young-Do 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.2
In this study, the sintering behavior of (Nd, Dy)-Fe-B powder which fabricated by strip-casting was investigated with various sintering temperatures and holding times. The relative density over 99% could be obtained by both sintering at $1070^{\circ}C$ for 1h and sintering at $970^{\circ}C$ for 20h. The grain growth was observed in sintered specimen at $1050^{\circ}C$ compared to one at $970^{\circ}C$. The isothermal sintering process below $1000^{\circ}C$ led to suppress grain growth showing the improved magnetic properties. The phase transformation of Nd-rich was confirmed by X-ray diffraction pattern.
반복 열처리한 Nd-Fe-B 소결 자석의 미세구조 제어 및 자성특성 평가
김세훈,김훈섭,김동환,김영도,Kim, Se-Hoon,Kim, Hoon-Sup,Kim, Dong-Hwan,Kim, Young-Do 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6
Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially for driving motors of hybrid and electric vehicles. The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity. Therefore, a post-sintering process like heat-treatment is required for improving the magnetic properties of Nd-Fe-B sintered magnets. In this study, cyclic heat treatment was performed at temperatures between $350^{\circ}C$ and $450^{\circ}C$ up to 16 cycles in order to control microstructures such as size and shape of the Nd-rich phase without grain growth of the $Nd_{2}Fe_{14}B$ phase. The 2 cycles specimen at this temperature range showed more homogeneous microstructure which leads to higher coercivity of 35 kOe than as-sintered one.
김세훈,우홍정,김영철,이장훈,Kim, Se-Hoon,Woo, Hong-Jung,Kim, Young-Chul,Lee, Jang-Hoon 대한한방내과학회 2009 大韓韓方內科學會誌 Vol.30 No.2
Objectives : This study was performed to investigate the anti-fibrogenic effect of Curcumae Longae Radix on human hepatic stellate cells. Materials and Methods: Hepatic stellate cells (LX-2) were treated with various concentrations of Curcumae Longae Radix extract for 24, 48, and 72 hours. It was extracted with distilled water. After the treatment, cell viability, proliferation, cell cycle analysis, procollagen levels and the mRNA of the ASMA, TIMPl, TIMP2, MMP2, collagen type la, PDGF-receptor-beta and TGF-beta were measured by using MTT assay, BrdU assay, RT-PCR, and procollagen type 1 C-peptide EIA kit. Results : The viability of HSCs decreased in the 48 hours group, and proliferation of HSCs decreased as the concentration increased. In the cell cycle analysis, Curcumae Longae Radix decreased the ratio of M phase, and increased the ratio of apoptosis, G0/G1 and S phase. In the RT-PCR, the mRNA expression of the collagen type la and ASMA decreased with the Curcumae Longae Radix treatment. The production of procollagen by the HSCs was decreased by the treatment of Curcumae Longae Radix with high dose. Conclusion : These results suggest that Curcumae Longae Radix is helpful in the treatment of liver fibrosis as well as liver cirrhosis.
피로를 주소로 내원한 환자의 생활섭생, 허손 및 피로의 상관성에 대한 고찰
김세훈,이장훈,이승보,최미영,김영철,우홍정,Kim, Se-Hoon,Lee, Jang-Hoon,Lee, Seung-Bo,Choi, Mi-Young,Kim, Young-Chul,Woo, Hong-Jung 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.1
Objectives : Consumption is a chronic wasting disease, in oriental medicine concept. Fatigue is a common symptom experienced by many people who have consumption. However, there has been little study about the relationship between consumption and fatigue in the Oriental medicine. For this reason, we attempted to investigate the present status of fatigue of outpatients, and its relation with consumption index, public health practice index, Chalder fatigue scale and Subjective Symptoms of Fatigue Test. Methods : The subjects were 149 outpatients who complain fatigue between Nov. 1, 2006 and Oct. 31, 2007. We measured degree of consumption by consumption index. We measured degree of fatigue by Chalder fatigue scale and Subjective Symptoms of Fatigue Test. Public health practice were investigated by "Breslow's 7 health practice". Results : Studies have shown that a group who disregard public health practices have higher numerical value, in part of $q\grave{i}-x\bar{u}$, $xu\grave{e}-x\bar{u}$, and Physical symptoms than a group more concerned with public health practice. A group who has fatigue for a period over 6 months are more likely to be $q\grave{i}-x\bar{u}$, $y\bar{i}n-x\bar{u}$, Chalder fatigue scale, neuro-sensory symptoms than a group fatigued for less than 6 months. Among the subjects, 81 (55.5%) were considered as 'fatigue patients' by the Chalder scale. Chalder fatigue scale, according to the Subjective Symptoms of Fatigue Test, consumption also, The more increase of Subjective symptoms of fatigue test, the more of consumption scale. Conclusions : This study has shown that there is a link between consumption and fatigue. Moreover, oriental medicine's consumption is more concrete than fatigue scale, so consumption index will have wide application to the study of fatigue.
진공사출금형용 STS316L 금속 다공체 제조 및 기계적 특성
김세훈,김상민,노상호,김진평,신재혁,성시영,진광진,김태안,Kim, Se Hoon,Kim, Sang Min,Noh, Sang Ho,Kim, Jin Pyeong,Shin, Jae Hyuck,Sung, Si-Young,Jin, Jin Kwang,Kim, Taean 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
In this study, porous stainless steel (STS316L) sintered body was fabricated by powder metallurgy method and its properties such as porosity, compressive yield strength, hardness, and permeability were evaluated. 67.5Fe-17Cr- 13Ni-2.5Mo (wt%) powder was produced by a water atomization. The atomized powder was classified into size with under $45{\mu}m$ and over $180{\mu}m$, and then they were compacted with various pressures and sintered at $1210^{\circ}C$ for 1 h in a vacuum atmosphere. The porosities of sintered bodies could be obtained in range of 20~53% by controlling the compaction pressure. Compressive yield strength and hardness were achieved up to 268 MPa and 94 Shore D, respectively. Air permeability was obtained up to $79l/min{\cdot}cm^2$. As a result, mechanical properties and air permeability of the optimized porous body having a porosity of 25~40% were very superior to that of Al alloy.
초미세 결정립을 가지는 몰리브덴의 제조 및 기계적 특성
김세훈,서영익,김대건,석명진,김영도,Kim, Se-Hoon,Seo, Young-Ik,Kim, Dae-Gun,Suk, Myung-Jin,Kim, Young-Do 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.3
Mo nanopowder was synthesized by ball-milling and subsequent hydrogen-reduction of $MoO_3$ powder. To fabricate ultra fine grained molybdenum, two-step sintering and spark plasma sintering process were employed. The grain size of specimen by two-step sintering and spark plasma sintering was around $0.6\;{\mu}m$ and $0.4\;{\mu}m$, respectively. Mechanical properties of ultra fine grained Mo with relative density of above 90% were significantly improved at room and high temperatures comparing to commercial bulk Mo of 99% relative density. This result was mainly explained by the grain size refinement due to diffusion-controlled sintering.
귀밑샘의 기무라병의 세침흡인 세포학적 소견 -세포학적 검사로 예측할 수 없었던 1예 보고-
김세훈,김혜령,김성은,양우익,이광길,홍순원,Kim, Se-Hoon,Kim, Hae-Ryoung,Kim, Sung-Eun,Yang, Woo-Ick,Lee, Kwang-Gil,Hong, Soon-Won 대한세포병리학회 2003 대한세포병리학회지 Vol.14 No.2
Kimura's disease is a chronic inflammatory disorder of unknown cause and is most prevalent among Asians. The cytologic findings of Kimura's disease are significant numbers of eosinophils in a background of lymphoid cells, occasional fragments of collagenous tissue, proliferation oi vessels, and Warthin-Finkeldey polykaryocytes. Among these features, the most important cytologic feature of Kimura's disease is a significant numbers of eosinophils. We experienced a case of Kimura's disease in the parotid gland which we fatted to recognize on cytology due to the apparent paucity of eosinophils. On careful retrograde reviewing of the cytologic findings, a few scattered leukocytes, previously interpreted as polymorphous leukocytes, had bilobed nuclei and coarse green but granular cytoplasm on Papanicolaou preparation. These leukocytes showed obvious orange-red intracyloplasmic granules as in eosionophils on Giemsa stain. The paucity of eosinophils may be due to the thick fibrosis around lymphoid follicles or any technical error during aspiration. Whereas the Warthin-Finkeldey type giant cell is not a sensitive cytologic marker of Kimura's disease, it may be a helpful cytologic feature. To reach a correct cytologic diagnosis of Kimura's disease, It is important to keep in mind that searching for Warthin-Finkeldey type giant cells and evaluation of Giemsa stain for detection of eosinophils would be helpful.
고에너지 볼밀링으로 제조된 나노구조 Fe-20 wt.%Si 합금 분말의 자성 특성에 미치는 결정립 크기의 영향
김세훈,이영중,이백희,이규환,김영도,Kim, Se-Hoon,Lee, Young Jung,Lee, Baek-Hee,Lee, Kyu Hwan,Kim, Young Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.5
The structural and magnetic properties of nanostructued Fe-20 ;wt.%Si alloy powders were investigated. Commercial Fe-20 wt.%Si alloy powders (Hoeganaes Co., USA) with 99.9% purities were used to fabricate the nanostructure Fe-Si alloy powders through a high-energy ball milling process. The alloy powders were fabricated at 400 rpm for 50 h, resulting in an average grain size of 16 nm. The nanostructured powder was characterized by fcc $Fe_{3}Si$ and hcp $Fe_{5}Si_3$ phases and exhibited a minimum coercivity of approximately 50 Oe.
김세훈,강휘진,Kim, Se-hoon,Kang, Hwi-jin 한국방재안전학회 2020 한국방재안전학회 논문집 Vol.13 No.1
전문건설 업체의 안전보건경영시스템 도입·구축·운용은 안전시스템 도입과 운영 과정에 소요되는 비용이 발생하는 문제가 있다. 그리고 건설 안전 분야 기술 인력을 보유하지 못한 열악한 환경에서 안전시스템 구축 및 인증 취득 및 정착으로의 선순환 체계 구축이 쉽지 않은 실정이다. 이 논문의 목적은 건설업 안전보건경영시스템 관련 문헌을 조사·검토하고 실태 등 다양한 연구 동향을 분석하는 데 있다. 이를 통하여 건설업 안전보건경영시스템 구축 및 인증을 취득하고자 하는 전문건설 업체와 인증 취득 후 사후심사 및 연장심사를 이행 중인 전문건설업체의 안전보건경영시스템 수준 향상을 위한 방안을 모색하는데 있다. The introduction, construction, and operation of the safety and health management system of specialized construction companies have a problem incurred in the cost of introducing and operating the safety system. In addition, it is difficult to establish a virtuous cycle system to build a safety system, obtain a certification, and settle in a harsh environment that does not have technical personnel in construction safety. The purpose of this paper is to investigate and review the literature related to the safety and health management system of the construction industry and to analyze various research trends such as the actual situation. Through this, it is to find ways to improve the safety and health management system level of specialized construction companies that want to build and obtain the safety and health management system of the construction industry and specialized construction companies that are carrying out the post-assessment and extension examination after obtaining the certification.