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김수민,여환호,김영균,김수관,서재훈,박인순,박인수,김용욱,Kim, Soo-Min,Yeo, Hwan-Ho,Kim, Young-Kyun,Kim, Su-Gwan,Seo, Jae-Hoon,Park, In-Soon,Park, In-Soo,Kim, Young-Uk 대한악안면성형재건외과학회 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.1
Treatment of infected mandibular fracture is confronted with various difficult problem, e.g. nosocomial wound infection, non-union of fracture, osteomyelitis. Recently, nosocomial infection has become a major health problem because of excessive morbidity, personal distress, and cost. Frequently, isolated causative microorganisms of nosocomial infection were staphylococcus aureus, pseudomonas aeruginosa, klebsiella species. The various manifestation of the disease related to the pathogenesis and the clinical course tend to give a bad prognosis after operation. This is a report of case that post-operative infected mandibular fracture in 53-year-old man was not healed even through aggressive I & D and antibiotic treatment.
광원의 특성에 따른 Boron-doped p-type Cz-Si 태양전지의 광열화 현상 분석
김수민,배수현,김영도,박성은,강윤묵,이해석,김동환,Kim, Soo Min,Bae, Soohyun,Kim, Young Do,Park, Sungeun,Kang, Yoonmook,Lee, Haeseok,Kim, Donghwan 한국재료학회 2014 한국재료학회지 Vol.24 No.6
When sunlight irradiates a boron-doped p-type solar cell, the formation of BsO2i decreases the power-conversion efficiency in a phenomenon named light-induced degradation (LID). In this study, we used boron-doped p-type Cz-Si solar cells to monitor this degradation process in relation to irradiation wavelength, intensity and duration of the light source, and investigated the reliability of the LID effects, as well. When halogen light irradiated a substrate, the LID rate increased more rapidly than for irradiation with xenon light. For different intensities of halogen light (e.g., 1 SUN and 0.1 SUN), a lower-limit value of LID showed a similar trend in each case; however, the rate reached at the intensity of 0.1 SUN was three times slower than that at 1 SUN. Open-circuit voltage increased with increasing duration of irradiation because the defect-formation rate of LID was slow. Therefore, we suppose that sufficient time is needed to increase LID defects. After a recovery process to restore the initial value, the lower-limit open-circuit voltage exhibited during the re-degradation process showed a trend similar to that in the first degradation process. We suggest that the proportion of the LID in boron-doped p-type Cz-Si solar cells has high correlation with the normalized defect concentrations (NDC) of BsO2i. This can be calculated using the extracted minority-carrier diffusion-length with internal quantum efficiency (IQE) analysis.
2단 실린더형 싸이클론의 물 및 오일 액적 제거 성능 분석 연구
김수민,김학준,김명준,한방우,우창규,김용진,Kim, Sumin,Kim, Hak-Joon,Kim, Myungjoon,Han, Bangwoo,Woo, Chang Gyu,Kim, Yong-Jin 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.3
A novel two stage cylindrical cyclone was developed for a 3 phase separator in shale oil production industry. The cyclone performance was compared with a cone type cyclone and multi cyclone at the same experimental condition using water and oil mists generated by a humidifier and atomizer at the flow rate 1 to $2m^3/min$. The removal efficiency of total suspended water droplets by the novel cyclone, calculated using inlet and outlet concentrations measured by an optical particle counter, was 99% which is higher than 90% of oil droplet removal efficiency at $2m^3/min$. It might be due to the evaporation of small water droplets during the tests. The water and oil droplet removal performance of the novel cyclone based on the quality factor which is a function of pressure drop and removal efficiency was the highest among three cyclones. The results indicate that the cyclone could be an economical device to remove water and oil mists from shale gas generation processes where a huge three phase separator is commonly used.
멜라민 화합물을 이용한 산화 그래핀 도핑 및 특성 평가
김수민,김현,김소양,한종훈,Kim, Sumin,Kim, Hyun,Kim, So Yang,Han, Jong Hun 한국재료학회 2019 한국재료학회지 Vol.29 No.11
In this paper, nitrogen-doped reduced graphene oxide(rGO) is obtained by thermal annealing of nitrogen-containing compounds and graphene oxide (GO) manufactured by modified Hummers' method. We use melamine as a nitrogen-containing compound and treat GO thermally with melamine at over $800{\sim}1,000^{\circ}C$ and 1 ~ 3 hr under Ar atmosphere. The electrical conductivity of doped rGO is measured by 4-point probe method. As a result, nitrogen contents on rGO are found to be in the range of 2.5 to 12.5 at% depending on the doping conditions after thermal annealing. The main doping site on graphene oxide is changed from pyridinic-N and pyrrolinic N to the graphitic site as the heat treatment temperature increases. The electrical conductivity of doped rGO increases as the N doping content increases. As the thermal treatment time increases, the change of both total doping contents and doping sites is slight and the surface resistance is remarkably reduced, which is caused by healing effects of doped graphene oxide at high temperature.
지역별 옹기의 특성분석 및 발효와의 상관관계 분석 : (1) 지역별 옹기의 물성 및 특성
김수민,노형구,김응수,조우석,Kim, Soomin,No, Hyunggoo,Kim, Ungsoo,Cho, Woo Seok 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.1
Onggi, described as a 'breathing' type of pottery' has significantly influenced the traditional food culture of Korea. It is known that Onggi is an optimal type of storage for fermented foods such as soy sauce, salted seafood, and Kimchi, as air or liquid can penetrate through the body of this material. These foods gain flavor due to the breeding of aerobic bacteria at the beginning of the fermentation process. In this study, Onggi materials from five regions, Gangjin, Yeoju, Ulsan, Yesan, and Jeju, were collected and analyzed to determine their chemical and physical properties before and after sintering. The differences in the raw materials of other mining regions are examined in terms of their chemical and mineralogical compositions, specific surface area, particle size, and particle distribution. Among them, the Gangjin raw material has the greatest mean particle size of $92.29{\mu}m$, as well as the widest particle size distribution. Differences in the levels of $SiO_2$ and $Fe_2O_3$ are shown among Onggi raw materials. However, the crystalline phases formed after sintering are identical, except for the Jeju samples. At all sintering temperatures tested here, Gangjin Onggi showed the greatest porosity, leading to complete air permeation through the body within 90 minutes. These results taken together indicate that air permeation is strongly related to the pore structures in the Onggi body. This is assumed to affect the fermentation behavior.
고상반응법에 의한 TiO<sub>2</sub>-SnO-ZnO의 주황 안료 합성에 관한 연구
김수민,김응수,조우석,Kim, Soomin,Kim, Ungsoo,Cho, Woo Seok 한국결정성장학회 2016 韓國結晶成長學會誌 Vol.26 No.5
본 연구에서는 납이나 크롬이 함유되지 않은 친환경적인 물질의 새로운 주황 무기 안료를 개발하고자 하였다. 고상반응법을 이용하여 LPG와 Air를 이용한 환원분위기에서 $TiO_2-SnO-ZnO$계 주황색 무기 안료를 합성하였다. 합성 된 안료들의 특성을 분석하기 위하여 표색계 값인 $L^*a^*b^*$ 값을 측정 후, XRD를 이용하여 결정 상을 분석하였고, SEM을 이용하여 미세구조 관찰하였으며, XPS를 이용하여 원소들의 산화가 상태를 분석하였다. 고상 반응법으로 합성 후 열처리한 $TiO_2-SnO-ZnO$ 안료는 yellow에서 orange-red 사이의 색을 가진다. $TiO_2-SnO-ZnO$ 안료의 결정상 분석 결과, 5가지의 결정상이 혼재하는 것을 볼 수 있는데, $SnO_2$가 cubic과 tetragonal 구조 중 어떤 결정 구조를 가지는지가 발색의 가장 중요한 요인으로 작용하는 것을 확인하였다. XPS를 이용하여 원소들의 산화가 상태를 분석한 결과, $Sn^{4+}$의 비율이 높을수록 안료가 rYR에 가까운 색을 가지는 것을 확인할 수 있다. In this study, new composition of orange color pigment was developed by replacing formerly used lead and chromium with environment-friendly elements. $TiO_2-SnO-ZnO$ composite was synthesized using the solid state reaction under the reducing atmosphere with the LPG and air mixture gas. The synthesized pigments were characterized by spectrophotometer, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The colorimetric analysis of pigments exhibited color values ranging from yellow to orange-red. Five different crystalline phases were formed after the heat treatment for 4 and 6 hours. The color of pigments was strongly influenced by the crystalline structure of $SnO_2$, having either cubic or tetragonal structure. The oxidation state study of elements revealed that the color of pigment is getting close to rYR with the increase of $Sn^{4+}$ ratio.
자가 재활운동이 장애노인의 일상활동 수행능력에 미치는 영향
김수민,Kim, Soo-Min 대한물리치료과학회 2010 대한물리치료과학회지 Vol.17 No.1
Background: It's very important method of treatment to improve physical activity for Activities of Daily Living(ADL) disability elder. So, We educated them Self rehabilition exercise and they did it by themselves, Then studied the influence in ADL disability elder. Methods: The participants of this study consited of 185 ADL disability elder in 18 located in Pusan & Kyungnam of elderly care hospital. We provided them 4 weeks of rehabilitation exercise training, and 4 weeks later we collected The state of ADL. Results: The ADL disability elder Who was educated and practiced Self rehabilition exercise, showed improvement on the several items of ADL, especially in Bathing. Conclusion: Self rehabilition exercise proved that it can improve ADL for disability elder I thank the system of Self exercise program has to be progressed.
도자기와의 물성 비교를 통한 옹기의 기공 형성 원인 분석
김수민,노형구,김응수,조우석,Kim, Soomin,No, Hyunggoo,Kim, Ungsoo,Cho, Woo Seok 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.1
Onggi, which is described as a breathing pottery, has strongly influenced the traditional food culture in Korea. In this study Onggi is compared to porcelains including celadon and white porcelain to analyze the sources of pore formation. The differences in starting materials are examined for chemical and mineralogical compositions, particle size and distribution. The gas permeability of the fired samples is correlated to the matrix microstructure. The broad particle size distribution and high iron oxide content of Onggi are revealed as the major cause for the pore formation. Open pores are formed with large particles in the Onggi body while closed pores have a high iron oxide concentration. The Onggi body with increased open pores leads to the high gas permeability.