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Co, Fe가 diopside 결정색 변화에 미치는 영향
변수민,이병하,Byeon, Soo Min,Lee, Byung-Ha 한국결정성장학회 2014 韓國結晶成長學會誌 Vol.24 No.5
본 연구에서는 도예가들이 경험적으로 제조하여 사용하는 diopside 결정유약에 $Co_3O_4$와 $Fe_2O_3$를 첨가하였을 경우 Co와 Fe이 유약과 diopside 결정의 발색에 미치는 영향을 연구하고자 하였다. 그 결과 diopside 결정유약에 $Co_3O_4$를 넣을 경우 유약의 색상은 blue색을 띠며 결정의 색상은 diopside 결정에 Co가 고용되면서 pastel violet색을 띠었으며 diopside 결정유약에 $Fe_2O_3$를 넣을 경우 유약의 색상은 brown색을, 결정의 색상은 diopside 결정에 Fe가 고용되면서 goldenrod색을 띠었다. 그리고 diopside 결정유약 표면에 석출된 결정은 diopside 결정과 diopside precursor로 이루어져 있었다. 또한 유지시간이 길어짐에 따라 diopside precursor의 량은 줄고 diopside 결정량은 많아졌다. Diopside 결정에는 Fe보다는 Co가 더 잘 고용되었으며, Co가 고용될 경우 diopside 결정성은 더 좋아져 특성 peak의 강도가 높아졌다. 그리고 Fe이 고용되면 특성 peak의 강도는 낮아지면서 diopside 결정은 부분적으로 와해됨을 알 수 있었다. This study was conducted to study the influence of Co and Fe on the color of glaze and diopside crystals in the diopside crystal glaze empirically produced and used by ceramic artists, in case of adding $Co_3O_4$ and $Fe_2O_3$. As a result, the color of glaze was blue when $Co_3O_4$ was added to the diopside crystal glaze and the diopside crystals appeared pastel violet with Co included. When $Fe_2O_3$ was added to the diopside crystal glaze, the color of glaze appeared brown and the color of diopside crystals was goldenrod with Fe included. The crystals precipitated on the surface of diopside consisted of diopside crystals and diopside precursors. With longer retention time, the amount of diopside precursors decreased and the amount of diopside crystals increased. Also, Co was more easily included by the diopside crystals than Fe was and crystallizability of dispside was improved in case of including Co. Including Fe lowered peak intensity of properties and partially dissolved the diopside crystals.
변수민,이병하,Byeon, Soo Min,Lee, Byung-Ha 한국재료학회 2014 한국재료학회지 Vol.24 No.8
Currently, diopside ($MgCaSi_2O_6$) crystal glaze is used frequently for pottery works or in earthen wares, though the process is not straightforward. However, to create and control the positions and sizes of the crystals in desired amounts when making pottery is difficult. To solve this problem, a diopside crystal seed was created at a temperature of $1450^{\circ}C$. After planting this seed in the glaze, a glaze combination and firing process which allows a user to create crystals with the desired position and at the desired size were established. In addition, in order to investigate the creation process of the crystals, the growth patterns of the crystals were observed and examined using Raman spectrography and XRD and SEM analyses. As a result, the optimum synthesis condition of the diopside seed was created by mixing 1 mole of $CaCo_3$, 0.2 mole of $(MgCo_3)_4(MgCoH)_2{\cdot}5H_2O$ and 2 moles of $SiO_2$ and then applying a firing process to the mixture at $1,450^{\circ}C$ for 30 minutes. The optimum glaze content of the seed was 70 % feldspar, 20 % limestone and 10 % $MgCo_3$. For the firing process, it was confirmed that the size of crystal is larger with a longer firing time at $1100^{\circ}C$ by completing a two-hour process at $1280^{\circ}C$. In addition, the diopside crystal has columnar structure and is less than $1{\mu}m$ in size.
김정지,변수민 사단법인 한국조형디자인협회 2023 조형디자인연구 Vol.26 No.4
Today, objects have various semantic systems beyond the purpose of use. In particular, in a consumer society, individuals express their identity through the consumption of objects, of which handbags are deeply related to social images that mainly reveal individual status as a means of showing off. However, handbags form a close relationship with the owner's daily life as a necessity that is widely used in the area of women's lives. Moreover, the fact that it shows different patterns depending on the use or the context of the owner shows the potential as a medium of self-expression that can reflect various aspects of individuals in the trajectory of life rather than being limited to social images. In this regard, it can be seen that the current handbag is closely related to the self in a semantic dimension beyond the functional dimension of simply containing and carrying objects. Thus, this study aims to explore the individual's ego aspect related to handbags through the relationship between self and handbags. In addition, based on this, we want to analyze the formative characteristics of handbags through work cases and consider their artistic value, and present a new perspective as a subject of modern visual art, away from the existing uniform perspective.
강호원,변수민,김대유,조윤재,경민규,이동연 대한족부족관절학회 2024 대한족부족관절학회지 Vol.28 No.1
Purpose: Foot pressure measurement devices are used widely in clinical settings for plantar pressure assessments. Despite the availability of various devices, studies evaluating the inter-device reliability are limited. This study compared plantar pressure measurements ob- tained from HR Mat (Tekscan Inc.) and EMED-n50 (Novel GmbH). Materials and Methods: The study involved 38 healthy male volunteers. The participants were categorized into two groups based on the Meary’s angle in standing foot lateral radiographs: those with normal feet (angles ranging from –4° to 4°) and those with mild flatfeet (angles from –8° to –15°). The static and dynamic plantar pressures of the participants were measured using HR Mat and EMED-n50. The reliability of the contact area and mean force was assessed using the interclass correlation coefficient (ICC). Furthermore, the differ- ences in measurements between the two devices were examined, considering the presence of mild flatfoot. Results: The ICC values for the contact area and mean force ranged from 0.703 to 0.947, indicating good-to-excellent reliability across all areas. EMED-n50 tended to record higher contact areas than HR Mat. The mean force was significantly higher in the forefoot region when measured with EMED-n50, whereas, in the hindfoot region, this difference was observed only during static measurements with HR Mat. Participants with mild flatfeet exhibited significantly higher contact areas in the midfoot region for both devices, with no con- sistent differences in the other parameters. Conclusion: The contact area and mean force measurements of the HR Mat and EMED-n50 showed high reliability. On the other hand, EMED-n50 tended to record higher contact areas than HR Mat. In cases of mild flatfoot, an increase in contact area within the midfoot region was observed, but no consistent impact on the differences between the two devices was evident.
김아람(A-Ram Kim),김동현(Dong-Hyun Kim),변수민(Soo Min Pyeun),정강원(Gangwon Jeong),권재환(Jae Hwan Gwon),여충원(Chung Won Yeo),이정석(Jung-Seag Lee),정귀택(Gwi-Taek Jeong) 한국생물공학회 2014 KSBB Journal Vol.29 No.6
In this study, the antioxidant activities of fractions (methanol, hexane, methylene chloride, butanol, ethyl acetate and water) of Solanum nigrum L. extract was investigated. The contents of total phenolic compounds of each fractions of methanol, butanol, methylene chloride, ethyl acetate, hexane and water are 4.41±0.23%, 5.57±0.35%, 9.89±0.19%, 9.86±0.19%, 1.89±0.04%, and 3.18±0.06%, respectively. For assay of antioxidant activity, 1,1-diphenyl-2-picryhydrazyl (DPPH) radical scavenging activity, reducing power and nitrite scavenging activity are evaluated. In DPPH radical scavenging activity, the highest effect was obtained from the fraction of ethyl acetate. Reducing power is ordered as ethyl acetate > methylene chloride > methanol. In nitrite scavenging activity, the highest activity was 5.5% (butanol fraction), whereas hexane fraction did not detected. Overall, antioxidant activities are closely related the content of phenolic compound in extracts of S. nigrum L.
변항룡 ( Byun Hang-ryong ),김준성 ( Kim Jun-seong ),변수민 ( Byun Su-min ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Generally, the case of which the non-equivalence subsidence happen is the great part of the column which is damaged due to the basis ground lacks. This study is the paper about the strengthening method of the column which is damaged by tensioning force. The possibility that the damage is enlarged is very high if we apply at the basis reinforcement with existing ground reinforcement method which accompanies a excavation and vibration. Because we disturb the basis ground by excavation and vibration. And strengthening method of column with carbon paper sheets or steel plates by bonding can make the durability increases. But we have the defect of the column which can not restore originally to the texture or form. We remove the cover of column which is damaged due to shear and tensile. And we covered to a non-shrinkage mortar after we were a which restriction low with T-shape steel plate and to wire rope by bolt tension method. The basis which is subsided were reinforced by steel pile with raising at the same time. And the column is strengthened which is damaged. We restored the texture and form originally of the column’s so that the column were neat and tidy.