악하선에 발생한 거대 타석증의 치험례

김민철,민성윤,김지용,안제영,김형곤,박광호,Kim, Min-Chul,Min, Sung-Yoon,Kim, Ji-Yong,Ahn, Je-Young,Kim, Hyung-Gon,Park, Kwang-Ho 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.1

Sialolithiasis is the most common disease caused by calculi in a salivary gland and its duct. The pain and swelling of salivary gland is a chief complaint of patients presenting. Most salivary gland calculi occur in the submandibular gland, but can also occur in the parotid gland and the sublingual gland. One giant sialolith is rarely reported, while the several cases of one or multiple sialolith in the submandibular gland have reported in the literatures. In this case, we have removed the sialolith in which perforated mouth floor along Wharton's duct and report it.

ISP 수립과 ERP 구성요소에 대한 차이 검증

김민철,김종훈,김근형,Kim, Min-Cheol,Kim, Jong-Hoon,Kim, Keun-Hyung 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.10

본 연구는 경영 전략, 조직, 프로세스 분석 재설계 그리고, 정보시스템 구축방안 등과 연계하여 ISP(정보전략계획) 방법론에서 ISP의 이행가능성과 효율성 측면과 관련된 실증분석을 실시하였다. 이를 통해 ISP와 ERP를 중심으로 그 범위 및 추진방안을 상호비교하고 이를 통해 효율적인 프로세스 구축 및 재설계 방안으로서 정보시스템 담당자와 의사결정자로 하여금 IP전략 수립과 프로세스 재설계 리엔지니어링 추진에 따른 체계적인 접근방법에 대한 바람직한 방향을 도출한다. 즉 ISP와 ERP의 공통점과 차이점을 바탕으로 이를 계획(Plan)과 실행(Do)의 과정으로 연계함으로써 기업의 업무프로세스를 개선하고, 정보시스템의 중장기 전략의 수립과 BPR을 함께 추진하는 것이 바람직 한 방안임을 고려하여 그 대안으로 연계모델을 제시할 필요가 있음을 알 수 있었다. This study provides the most simplified ISP method while involving management strategy, organization process analysis, redesign and information system implementation strategy to enhance the feasibility and the efficiency of ISP. So this study compared the scope and the development projects of ISP and ERP. Through this, it provided a ISP connection model as a solution to effective process implementation and redesign and conducted study to provide systematic access method according to IT strategy implementation, process redesign and reengineering.

200 N급 GCH₄/LOx 소형로켓엔진의 형상설계와 성능시험평가 (Part II: 정상상태 지상연소시험)

김민철,김영진,김정수,Kim, Min Cheol,Kim, Young Jin,Kim, Jeong Soo 한국추진공학회 2020 한국추진공학회지 Vol.24 No.1

200 N급 기체메탄/액체산소 소형로켓엔진의 성능시험평가 수행되었다. 산화제 공급압이 증가함에 따라 연소압과 추력이 증가하였으며, 이에 따라 비추력과 특성속도 및 그 효율이 증가하였다. 특성속도는 약 90%의 성능효율로 측정되었다. 시험조건의 연소실 종횡비 변화는 추력성능에 영향을 미치지 않았다. 또한, 시험결과의 신뢰도 확보를 위하여 불확도평가를 수행하였다. A performance evaluation of the 200 N-class GCH₄/LOx small rocket engine was performed through ground hot-firing test. As a result, the combustion pressure and thrust raised with the increase of the oxidizer supply pressure, and thus the specific impulse, characteristic velocity, and their efficiency increased. The characteristic velocity was measured at about 90% performance efficiency. The change of chamber aspect ratio did not affect the performance of the rocket engine in the test condition specified. In addition, uncertainty evaluation was conducted to ensure the reliability of the test results.

유헬스에서의 확장된 기술수용모형 적용 - 자기효능의 영향 중심

김민철,Kim, Mincheol 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.12

본 논문은 스마트 폰 기반의 유비쿼터스 헬스 시스템의 수용 여부에 영향을 미치는 건강 자기효능감 (health self-efficacy) 및 기술 자기효능감 (technology self-efficacy) 요인들의 영향 정도를 확장된 기술수용모형(TAM)을 통하여 분석하는데 목표를 두고 있다. 본 논문에서는 표본의 크기를 고려하여 제시된 연구 모형을 검증하기 위하여 PLS-SEM 방법론을 적용하였다. 분석 결과, 제시된 연구모형의 적합성을 확인하였고, 각 경로 계수의 통계적 유의성 또한 분석이 되었다. 결국, 기술 자기효능감인 스마트 폰 기기의 사용에 대한 쉬운 접근성만 높일 수만 있다면, 사용 의도의 가능성이 높아짐을 확인할 수 있었다. The aim of this study was to search for the effects of health self-efficacy and technology self-efficacy on user's behavioural intention by the extended TAM focused on smartphone base ubiquitous health system. In this research, in view of small sample size, PLS - SEM methodology was applied to this study in order to the proposed research model. As a result of analysis, the statistical fitness of proposed research model was confirmed through GoF value and the path coefficient was calculated for the hypotheses test. Finally, the implications of analysis result showed that when the use of smartphone device could be easily accessed in the side of technology self-efficacy, the possibility of user's behavioural intention also might be higher.

공공기관의 지식관리시스템의 이용 유무의 영향 요인 탐색 - 제주특별자치도 사례를 중심으로 -

김민철,김동욱,Kim, Min-Cheol,Kim, Dong-Wuk 한국과학기술정보연구원 과학기술정보센터 2011 Journal of Information Science Theory and Practice Vol.42 No.1

국내 외의 지식관리와 관련한 연구 대부분은 민간기업을 대상으로 이루어졌고, 공공부문 중에서 지방자치단체의 지식관리시스템 효과나 핵심요인에 대한 구체적인 사례연구는 부족한 상황이고, 그 기존 연구도 대부분 지식관리시스템 만족 요인 탐색인데 반해서 본 연구에서는 지식관리시스템의 이용 정도를 높이기 위해서는 어떤 영향 요인이 중요한지를 탐색하는 데 있다. 본 연구에서는 지식관리시스템이 갖고 있는 어떤 요인이 지식관리시스템 이용 유무에 원인이 되는지 고찰하기 위하여 분석모형에 포함된 지식관리시스템 케퍼빌리티의 구성요소와 개인 및 조직 케퍼빌리티의 구성요소 및 인구 통계학적 요인들을 독립변수로 하여 로짓회귀모형으로 분석 검증한다. '지식관리시스템 이용 유무'에 가장 영향을 미치는 변수는 '지식창조', 다음으로 유의한 변수인 '지식인프라', '부서장의 추진 의지' 요인도 유의하게 산출되었다. Currently, managers and researchers have come to recognize the importance of knowledge as an asset to the organization. Knowledge Management System (KMS) is developed as a tool to manage the organizational knowledge. A significant literature about Knowledge Management in the private, but not public sector. The purpose of the study is to analyze the influencing factors for KMS utilization in a public sector, Jeju Provincial Government Organization. This study performed an empirical research on factors that affect the use of KMS using Knowledge Management system capability and individual & organizational capability criteria. Survey was conducted with 150 employees from Jeju Provincial Government Organization. The Results show that an ability to create knowledge, and knowledge infrastructure are significant factors in determining the level of usage of Knowledge Management system. In particular, the most important factor that influences the usage of Knowledge Management is knowledge creation. and then knowledge infrastructure. The result also shows that the usage of KMS is affected by management's support willingness.

차세대 원전 대형 압력용기용 고강도 SA508 Gr.4N Ni-Cr-Mo계 저합금강 개발

김민철,박상규,이기형,이봉상,Kim, Min-Chul,Park, Sang-Gyu,Lee, Ki-Hyoung,Lee, Bong-Sang 한국압력기기공학회 2014 한국압력기기공학회 논문집 Vol.10 No.1

There is a growing need to introduce advanced pressure vessel steels with higher strength and toughness for the optimizatiooCn of the design and construction of longer life and larger capacity nuclear power plants. SA508 Gr.4N Ni-Cr-Mo low alloy steels have superior strength and fracture toughness, compared to SA508 Gr.3 Mn-Mo-Ni low alloy steel. Therefore, the application of SA508 Gr.4N low alloy steel could be considered to satisfy the strength and toughness required in advanced nuclear power plants. The purpose of this study is to characterize the microstructure and mechanical properties of SA508 Gr.4N low alloy steels. 1 ton ingot of SA508 Gr.4N model alloy was fabricated by vacuum induction melting followed by forging, quenching, and tempering. The predominant microstructure of the SA508 Gr.4N model alloy is tempered martensite having small packet and fine Cr-rich carbides. The yield strength at room temperature was 540MPa, and it was decreased with an increase of test temperature while DSA phenomenon occurred at around $288^{\circ}C$. Overall transition property of SA508 Gr.4N model alloy was much better than SA508 Gr.3 low alloy steel. The index temperature, $T_{41J}$, of SA508 Gr.4N model alloy was $-132^{\circ}C$ in Charpy impact tests, and reference nil-ductility transition temperature, $RT_{NDT}$ of $-105^{\circ}C$ was obtained from drop weight tests. From the fracture toughness tests performed in accordance with the ASTM standard E1921 Master curve method, the reference temperature, $T_0$ was $-147^{\circ}C$, which was improved more than $60^{\circ}C$ compared to SA508 Gr.3 low alloy steels.

IC칩 기반모바일뱅킹 서비스에 있어서 기술수용모형의 구조관계 분석

김민철,김민수,Kim, Min-Cheol,Kim, Min-Su 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.12

The objective of this study is to get an implication through the application of Technology Acceptance Model (TAM) focused on Mobile Banking Service based on IC Chip. Thus firstly, this study reviewed the related literatures and materials. After this, this parer analyzed this TAM model with covariance structural method to search the factors influencing technology acceptance of Mobile banking service. In conclusion, the proposed model showed that 'innovation factor' influenced 'perceived usefulness' and 'user's acquaintance' influenced 'perceived ease of use'. And this 'perceived usefulness' influenced 'perceived ease of use' and this 'perceived ease of use' influence 'attitude toward use'. 본 연구는 IC 칩 기반의 모바일 뱅킹 서비스를 대상으로 기술수용모델에서의 적용을 통해 정책적 시사점을 얻고자 하였다. 따라서 모바일 뱅킹의 현황 및 기술수용모형에 관한 선행 연구를 살펴보고 이를 통해 모바일 뱅킹 서비스의 수용에 영향을 미칠 수 있는 요인들 간의 관계를 구조관계분석을 통해 살펴보았다. 본 연구에서 제시한 모형에서 혁신성이 지각된 유용성에 영향을 미치며, 사용자 친숙성이 지각된 용이성에 영향을 미침을 알 수 있었다. 그리고 이러한 지각된 사용 용이성은 지각된 유용성에 영향을 미치고 이러한 영향은 태도에 영향을 미친다는 것을 알 수 있었다.

통신사업자 관점에서의 유비쿼터스 헬스 시장 규모 추정

김민철,김동수,Kim, Min-Cheol,Kim, Dong-Soo 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.12

현재 유비쿼터스 헬스 시스템의 기술을 뒷받침할 수 있는 비즈니스 수익 모델의 개발 및 사업 유형화의 개발은 현실적으로 필요하며, 현재는 이러한 모델 개발을 시작하는 단계라 할 수 있다. 이러한 모델 개발과 관련하여 본 연구는 통신사업자 관점에서의 u-헬스 시장 규모 추정을 실시하였다. 이를 위해 가상시장 평가법(CVM)을 이용하여 유비쿼터스 헬스 시스템의 전체 시장에서 통신사업자 추정 비율을 적용하였다. 결론적으로 유비쿼터스 비즈니스 모델이 모바일에 근거한다는 가정 하에 유비쿼터스 시장에서는 통신사업자가 초기에 다른 시장의 참여자와의 전략적 제휴를 통해 계속적으로 시장점유율을 높일 수 있을 것으로 예측할 수 있다. This paper is to estimate the market potentiality of ubiquitous health(u-health) from a viewpoint of communication companies. For this estimation, we used the CVM and adopted the ratio of ovum(2000) in overall market of u-health. That is, firstly, we assumed the u-business model was based on mobile business approach. Through this estimation, we conclude that communication companies at the initial stage of the u-health market can continuously promote the market share ratio via strategic alliance with the players participating.

토양정화 공법 및 단위공정에 따른 토양건강성 평가

김민철,천미희,김정선,박민정,Kim, Mintchul,Chun, Mihee,Kim, Jungsun,Park, Minjeong 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.6

The Soil Health Index (SHI) developed by Park et al. (2021) is used to evaluate soil health on remediated soils collected from several remediation project sites and monitored the changes of SHI during the remediation process of land farming, soil washing, and thermal desorption. In the case of land farming, the soils remediated below a legal standard didn't show any significant changes in indices of SHI except the downgrade of available phosphate from medium to a low level. The SHI scores were ranged from 52 to 56 in the contaminated soil and 54 to 57 in the remediated soil. With soil washing, bulk density changed from high to a low level, and available phosphate was lowered from medium to low level. As the SHI scores were evaluated as 58 to 63 for contaminated soil and 38 to 42 for remediated soils. For thermal desorption, soil respiration rate was reduced from high to low level and SHI was scored as 50 to 51 for contaminated soils and 43 to 47 for remediated soils. Even though any abrupt changes of the SHI in remediated soils were not identified in the soils used in this study, it is expected that soil in different conditions such as types and concentrations of contaminant and soil characteristics would result in distinguished changes of the SHI. There is a room for more studies collect diverse information on SHI across the country.

Optical Characterization of Ge Quantum Dots Grown by Using Rapid Thermal Chemical Vapor Deposition

김민철,Suk-Ho Choi,C. J. Park,H. T. Oh,H. Y. Cho,Kyu Il Han,Sung Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6

The optical properties of multi-stacked Ge quantum dots (QDs) grown on Si (100) by using rapid thermal chemical-vapor deposition have been studied by using photoluminescence (PL), high-resolution transmission electron microscopy (HRTEM), and atomic force microscopy (AFM). The HRTEM images demonstrate vertically ordered Ge QDs and full contrast between the Si spacer and the Ge QDs. With increasing growth temperature, the size and the height of the dots increase, but the dot density decreases, as confirmed by using AFM. The Ge QDs had a bimodal shape distribution with domes and pyramids coexisting at specific growth conditions. The two major emission bands observed in the PL spectra are attributed to non-phonon (NP) and transverse-optical (TO) phonon replica of the Ge QDs and they are blue-shifted with decreasing thickness of the Si spacer. The interdiffusion or intermixing effects of Ge QDs have been studied by annealing the samples at various temperatures. As the excitation power increases, the NP energy of the Ge QDs is shifted to higher energy, and a plot of PL intensity vs excitation power shows a sublinear behavior with powers of 0.68 and 0.75 for the NP and the TO PL peaks, respectively. The experimental results are discussed with reference to possible emission mechanisms of Ge QDs/Si.#?