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In-situ $MgB_2$ 선재의 소결온도와 SiC 함량에 따른 미세조직 및 초전도 특성 연구
황수민,박의철,박시홍,장석헌,김규태,임준형,주진호,강원남,김찬중,Hwang, Soo-Min,Park, Eui-Cheol,Park, Si-Hong,Jang, Seok-Hern,Kim, Kyu-Tae,Lim, Jun-Hyung,Joo, Jin-Ho,Kang, Won-Nam,Kim, Chan-Joong 한국초전도학회 2007 Progress in superconductivity Vol.9 No.1
We fabricated the in-situ $MgB_2$ wires using the powder-in-tube method and investigated the effects of sintering temperature and SiC contents on the microstructure and superconducting properties. Pure $MgB_2$ wires and 5, 10, 20 wt.% SiC doped $MgB_2$ wires were sintered at $600-1000^{\circ}C$ for 30 minutes in Ar atmosphere. We found that $MgB_2$ phase was mostly formed at the sintering temperature of $700^{\circ}C$ and above, and the critical temperature ($T_c$) increased with increasing sintering temperature. For the $MgB_2$ sintered at $850^{\circ}C$, the highest critical current density ($J_c$) was obtained to be $3.7{\times}10^5\;A/cm^2$ at 5 K and 1.6 T by a magnetic properties measurement system (MPMS). The addition of SiC to the $MgB_2$ wires changed microstructure and critical properties. SEM observation showed that the $MgB_2$ core had considerable micro-cracks in undoped wire and the density of micro-cracks decreased with increasing SiC contents. The critical temperature decreased as the SiC contents increased, on the other hand, the critical current density of SiC doped $MgB_2$ wires in high magnetic field was enhanced compared to that of undoped $MgB_2$ wires.
기계적 합금화 및 in-situ와 ex-situ의 혼합공정을 통한 C 도핑된 ex-situ $MgB_2$ 선재 제조
황수민,이창민,임준형,최준혁,박진현,주진호,전병혁,김찬중,Hwang, Soo-Min,Lee, Chang-Min,Lim, Jun-Hyung,Choi, Jun-Hyuk,Park, Jin-Hyun,Joo, Jin-Ho,Jun, Byung-Hyuk,Kim, Chan-Joong 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
We successfully fabricated C-doped ex-situ $MgB_2$ wires using two different methods such as mechanical alloying(MA) and combined process(CP) of in-situ and ex-situ. In the MA, the precursor powder was prepared with a mixture of $MgB_2$ and 1 at% C powders by planetary ball milling for 0-100 h. In the CP, on the other hand, C-doped $MgB_2$ powder was prepared with Mg, B, and C powders by in-situ process via compaction, sintering, and crushing. The powders prepared by two methods were loaded into Fe tube and then the assemblages were drawn by a conventional powder-in-tube technique. The MA treatment of C-added $MgB_2$ decreased the particles/grains size and resulted in C-doping into $MgB_2$ after sintering, improving the critical current density($J_c$) in high external magnetic field. For the C-doped $MgB_2$ wire by MA for 25 h, the $J_c$ was $4.1{\times}10^3A/cm^2$ at 5 K and 6.4 T, which was 5.9 times higher than that of pure and untreated $MgB_2$ wire. The CP also provided C-doping into $MgB_2$ and improved the $J_c$ in high magnetic field; the C-doped $MgB_2$ wire fabricated by CP exhibited a $J_c$ being 2.3 times higher than that of the ex-situ wire used commercial $MgB_2$ powder at 5 K and 6.0 T($2.7{\times}10^3A/cm^2\;vs.\;1.2{\times}10^3A/cm^2$).
황수민(Soo Min Hwang),김진숙(Jin Sook Kim) 한국인체미용예술학회 2017 한국인체미용예술학회지 Vol.18 No.3
Science technology has developed in modern society, and people’s literary level and aesthetic value standards have not only increased but also become more diverse. This trend has ushered in the advancement of popular culture and both pursues and forms integrated beauty in an interaction with art, culture, film and academic studies. The aesthetic pursuit of modern people has included the search for uniqueness and diversity. In addition, the development of a new genre called ‘hair art’ in the beauty arts offers a new possibility for artistic values. The creation of hair as art work is evolving into a new formative art and recently, hair art has emerged as a field of study with possibilities in the beauty arts. As a result, there have been studies on ‘hair art’ in some colleges. Even though diverse research methods and creative hair art studies have been conducted, however, the expression methods have been limited. In addition, there has been a need to make use of new motifs or other materials in setting the research topic. Therefore, this study attempted to investigate previous hair art-related studies and to suggest a future direction for hair art according to current trends. A total of 104 academic journals and papers on hair art from the National Assembly Library of Korea, RISS and KISS were analyzed and redundant studies were excluded from this survey.
톤 온 톤&톤 인 톤 배색기법을 적용한 헤어 디자인 작품 연구 : O.M.C 헤어 월드 종목 중심으로
황수민(Soo-Min Hwang) 한국인체미용예술학회 2021 한국인체미용예술학회지 Vol.22 No.4
In terms of the meaning of hairstyling competitions, the creativity and color of new hairstyle can be analyzed from the perspective of cosmetology industry. Through creative activities, then, it is possible to promote cosmetology culture according to the globalization of hair trends along with hair salon practices. One of the most popular and trending hairstyling competitions is Organization Mondiale de la Coiffure (O.M.C) HAIR WORLD. In hairstyling, color is crucial in determining the images of hairstyles. According to contemporary and annual trends, diverse color combinations have been used for hair coloring. In hairstyling competitions, color has a considerable influence on hairstyles and images and is important from a visual aspect. Therefore, this study investigated and analyzed the images of the hairstyles from the O.M.C HAIR WORLD from 2014 when Korean hairdressers started to participate and win the championship to 2018. Then, it suggested hairstyles and color matches, using tone-on-tone and tone-in-tone combinations which are most common coloring combinations. It is anticipated that the study results would be available as the data which are needed in analyzing hair collections and predicting color combination trends.
주영호,황수민,박상헌,정광윤,Ju, Young Ho,Hwang, Soo Min,Park, Sangheon,Jung, Kwang-Yoon 대한기관식도과학회 2013 大韓氣管食道科學會誌 Vol.19 No.1
Foreign bodies in the oral cavity and pharyngolarynx are frequently observed accidental cases in the otolaryngological fields. Most foreign bodies can be recognized and removable with the manipulation of endoscopes and various instruments. However, foreign bodies that penetrate the oral cavity and oropharynx to appear as a tongue mass are rare. Therefore, such cases easily can be misconceived as tongue tumor at first, so it must involve a more thorough search utilizing such aids as computed tomography. Depending on their location and size, their removal may involve surgical intervention. The authors experienced such a rare case of an elderly male patient, presenting as tongue mass. We hereby report this case along with the relevant literature.
Additive 공정을 이용한 미세 피치용 니켈 메탈마스크의 제조 및 특성평가
박의철,임준형,김규태,박시홍,황수민,심종현,정승부,김봉수,주진호,Park, Eui-Cheol,Lim, Jun-Hyung,Kim, Kyu-Tae,Park, Si-Hong,Hwang, Soo-Min,Shim, Jong-Hyun,Jung, Seung-Boo,Kim, Bong-Soo,Joo, Jin-Ho 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
We successively fabricated the Ni metal mask by additive method and evaluated the effects of wetting agents addition on the microstructure, hardness, and friction coefficient. In the process, the additive patterns with fine hole and pitch were made by photolithography technique and subsequently Ni plate was electroformed on the patterns. We found that the microstructure and mechanical properties were significantly varied when the different combinations of the wetting agents were used. When the wetting agents of both SF-1 and SF-2 were added, the microstructure consisted of crystal and amorphous phases, the grain size reduced to 5-40 nm, the RMS value decreased to 11.4 nm and the wear resistance improved. In addition, the hardness was as high as 638 Hv which is higher than that of commercial stainless steel mask and this improvement is probably due to the presence of amorphous Phase and fine grain size. The improvement of the wear resistance can provide a higher reliability and a longer service life.
TFA-MOD법으로 제조된 다층 YBCO 박막의 미세구조 관찰
장석헌,임준형,이창민,황수민,최준혁,심종현,주진호,김찬중,Jang, Seok-Hern,Lim, Jun-Hyung,Lee, Chang-Min,Hwang, Soo-Min,Choi, Jun-Hyuk,Shim, Jong-Hyun,Joo, Jin-Ho,Kim, Chan-Joong 한국초전도학회 2008 Progress in superconductivity Vol.9 No.2
We fabricated $YBa_2Cu_3O_{7-x}$(YBCO) films on (00l) $LaAlO_3$ substrates prepared by metal organic deposition(MOD) method using trifluoroacetate(TFA) solution. The films with various thicknesses were prepared by repeating the dip-coating and calcining processes. The effects of film thickness on phase formation, microstructures, and critical properties were evaluated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The microstructure and resultant critical current($I_C$) and critical current density($J_C$) varied remarkably with film thickness: The ($I_C$) value increased from 39 to 160 A/cm-width as the number of coatings increased from one to four, while the corresponding $J_C$ was measured to be in the range of $0.84-1.21\;MA/cm^2$. Both the $I_C$ and $J_C$ decreased when an additional coating was applied due to microstructural degradation, indicating that the optimum thickness is in the range of $1.1-1.8\;{\mu}m$. The possible cause for the decrease in the $I_C$ and $J_C$ value for film thicker than $1.8\;{\mu}m$ include non-uniform thickness, increased surface roughness, and the poor formability of the YBCO phase and texture arising from the insufficient heat treatment time with respect to the increased thickness.
박상헌(Sangheon Park),황수민(Soo Min Hwang),박민우(Min Woo Park),정광윤(Kwang-Yoon Jung) 대한두경부종양학회 2013 대한두경부 종양학회지 Vol.29 No.2
Thymoma is the most common anterior mediastinal mass in adult, and arises from thymic epithelial cells which includes consists various proportions of epithelial and lymphocytic aspect. Thymic epithelial cell arises from the ventral wings of the third and fourth branchial pouches in the embryo, and these cells are considered tumorous condition of thymoma. Surgical resection is main treatment of thymoma. And adjuvant chemotherapy or radiation is considered due to postoperative pathologic diagnosis. We experienced a tumor which located from left anterior neck along superior mediastinum on chest radiograph incidentally and diagnosed parathyroid adenoma clinically. After surgical removal, final pathologic report was thymoma. Here, we present the case with a review of the relat-ed literatures.