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웰라 컬렉션에 나타난 헤어디자인 트렌드 분석연구2014년에서 2018년까지
황수민,김진숙,손진아 한국인체미용예술학회 2018 한국인체미용예술학회지 Vol.19 No.4
Entering the 21st century, new cultural trends have been formed after changes in social perception and the environment. Social psychologist Erich Seligmann Fromm proposed that ‘the ability to predict the future and express subjects and acts in diverse ideas’ is an attribute that makes humans different from animals. There are very diverse ways and views to predict trends and experts from individual fields can predict trends by studying related laws. These trends can be viewed as a phenomenon that expresses the emotions and personality that exist in people’s consciousness. In modern society, people want to create trendy and unique styles, using diverse elements and design factors by escaping from a conventional concept of beauty. Humans design and develop new tools that are both esthetic and functional through harmony between art and science. In fashion, art and cosmetology, trendy collections are suggested annually by predicting trends in advance. New and diverse trends that differ from past trends are always pursued. With the development of mass media, furthermore, trends have become a large issue around the globe. Hairstyling is closely related to trend so that there should be continued studies on new trends. Therefore, this study investigated hairstyle trends in the Wella Collection from 2014 to 2018. It analyzed these hairstyles by shape, texture and color, and the results are available as basic data for analyzing hair collections. It is hoped that they would be useful in predicting future trends.
황수민,이창민,김원,박근철,주진호,임준형,강원남,박영순,김동호 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.6
We fabricated carbon-doped MgB2 wires by an in-situ reaction route using cellulose acetate (CA) as an organic dopant in order to investigate the correlation between the critical properties and the CA doping level based on the phase formation and lattice changes. The starting B powder was uniformly mixed with 0 wt.% to 7 wt.% CA powders by a liquid mixing technique. The precursor powders were mixed with Mg powder and loaded into Fe tubes, which were drawn into wires and then sintered at 900 °C for 1 h under an Ar atmosphere. The CA doping reduced the critical temperature (Tc), but improved the critical current density (Jc) in the magnetic field, upper critical field (Hc2), and irreversibility field (Hirr). These effects were attributed to the CA doping-induced substitution of C for the B sites, which consequently increased the flux pinning force and the charge-carrier scattering. The Jc value of the MgB2 wire doped with 7 wt.% CA was improved by a factor of 31 (3.46 kA/cm2) as compared with that of the pure wire (0.11 kA/cm2) at 5 K and 6.6 T. This increase suggests that the CA doping via the liquid mixing is an effective way to improve the Jc(B)and Hc2 of MgB2 wire.
LC-HRMS 기반의 표적, 추정 및 비표적 분석기법을 이용한 화포습지 내 미량오염물질 및 대사체 분석
황수민,전준호 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.4
Located in Gimhae, Hwapo is the biggest riverine wetland in the province of Gyeongsangsam-do, Korea, and is a major habitat for various species. However, it is suspected that various pollutants enter the wetlands from agricultural and industrial areas. This study identifies major organic pollutants in this wetland and their sources using high performance liquid chromatography-high resolution mass spectrometry during one summer season. Forty-five substances were selected for quantitative analysis using target screening, and other non-selected compounds were screened using suspect and non-target screening methods. The results were that 21 and 17 targeted substances were detected in July and August, respectively. Major pollutants in July and August were oxadiazon (July: 17-220 ng/L, August: 66-460 ng/L), carbendazim (July: 10-110 ng/L, August: 64-520 ng/L), caffeine (July: 33-1,100 ng/L, August: 56-580 ng/L), and niflumic acid (July: 23-75 ng/L, August: 42-290 ng/ L). Sampling sites S4 in July and S2 in August were the major inflow points. Ten substances (tricyclazole, hexaconazole, diuron, fexofenadine, irbesartan, simetryn, cimetidine, valsartan, tebuconazole, and benzotriazole) and four metabolites (valsartan acid, azoxystrobin acid, TEB_M324c, and 2-aminobenzimidazole) were tentatively identified through suspect and non-target screening, respectively.
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($2.7{\times}10^3A/cm^2\;vs.\;1.2{\times}10^3A/cm^2$).
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.
황수민,양문수 세종연구소 2020 국가전략 Vol.26 No.1
본 연구의 목적은 김정은 시대 실시된 금융개혁을 분석하는 데 있다. 북한의 금융개혁은 재정개혁, 기관·기업소 개혁, 지방 분권화 등을 포괄하고 뒷받침하는 ‘북한식’ 개혁이라는 특징을 갖는다. 이를 분석하기 위해 김정은 집권 이후 제·개정된 관련 법률과 북한의 공식문헌을 활용하였다. 보완적으로 실제 제도의 작동양태를 확인하기 위해 탈북자 인터뷰를 시도했다. 김정은 시대 금융개혁은 화폐순환구조의 회복과 사금융 제도 내 편입, 지방의 자력갱생 이라는 기대효과를 갖는다. 이를 통해 북한 당국은 제재가 강화되는 대외요건 속에서 효율적으로 국내 자금을 동원할 수 있으며, 중앙정부의 재정부담을 경감시킬 수 있다. 이 연구는 김정은 시대 금융개혁을 종합적으로 분석하고 실제 금융개혁의 효과를 분석하는데 시사점을 제공할 수 있다. The purpose of this study is to analyze financial reforms carried out during the Kim Jong-Un era. North Korea’s financial reforms are characterized by “North Korean style” reforms that encompass fiscal reforms, enterprises reforms and governance decentralization. For the analysis, official documents related to relevant laws that have been enacted and revised since Kim Jong-Un took power were reviewed. In addition, interviews with North Korean defectors were conducted to see how the actual system works and complement the analysis. Financial reforms during the Kim Jong-Un era have the expectancy effects of recovery of the currency cycle, integration of the private financial system into the public financial system and self-reliance of local districts. This allows the North Korean authorities to mobilize domestic funds efficiently and ease the central government's financial burden amid toughened external sanctions. The study can provide implications for comprehensively analyzing financial reforms in the Kim Jong-un era and analyzing the effects of actual financial reforms.