Barkhausen noise를 이용한 1Cr-1Mo-0.25V강의 열화도 평가

이종민,안봉영,남승훈,이승석,이억섭,남영현,Lee, Jong-Min,Ahn, Bong-Young,Nahm, Seung-Hoon,Lee, Seung-Seok,Lee, Ouk-Sub,Nam, Young-Hyun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7

It is inevitable to evaluate the life of turbine rotor because the operating periods of power plants need to be extended. For the test, seven kinds of specimens with different degradation levels were prepared by the isothermal heat treatment at $630^{\circ}C$. Magnetic methods utilizing Barkhausen noise coercive force($BN_c$) were applied to detect the degradation caused by thermal aging. Magnetic property of material is related with domain dynamics and that is affected by the microstructure of material. Therefore $BN_c$ is very sensitive to the microstructure change of the material. With the increase of degradation, $BN_c$ was decreased and this phenomenon is considered due to precipitations and grain size. The result was compared with Vickers hardness($H_v$) and coercive force($H_c$) to detect the relative variation, and was related with $H_v$ and YS to estimate the change of the mechanical properties with the degradation.

Cone Beam Computed Tomography의 두부계측분석을 통한 골격성 제3급 부정교합 환자에서 악교정 수술 후 입술과 주위 연조직의 수직적 변화

이종민,강주완,이종호,김창현,박재억,Lee, Jong-Min,Kang, Joo-Wan,Lee, Jong-Ho,Kim, Chang-Hyen,Park, Je Uk 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.5

Purpose: The aim of this study is to evaluate the vertical changes of the lip and perioral soft tissue, following orthognathic surgery in skeletal class III patients by a cephalometric analysis of a cone beam computed tomography (CBCT). Methods: A total of 20 skeletal class III patients, who had bimaxillary surgery with Le Fort 1 osteotomy and bilateral sagittal split ramus osteotomy, were included in this study. The surgical plan for maxilla was posterosuperior impaction with the anterior nasal spine, as the rotation center. Further, the surgical plan for mandible was also posterosuperior movement. The soft tissue changes between lateral cephalogram and CBCT were compared. And the correlations between independent variables and dependent variables were evaluated. Results: There were no significant differences of the soft tissues changes between lateral cephalogram and CBCT. Upper lip philtrum length (SnLs), nasolabial angle increased and upper lip vermilion length (LsStms), lower lip length (StmiB'), lower lip vermilion length (StmiLi), lower lip philtrum length (LiB') and soft tissue lower facial height (SnMe') decreased after surgery. Change of SnLs (${\Delta}$SnLs) was influenced by vertical change of menton (${\Delta}$MeV), and change of LsStms (${\Delta}$LsStms) was influenced by upper lip thickness (ULT). Change of StmiLi' (${\Delta}$StmiLi') were influenced by preoperative overjet. Change of StmiB' (${\Delta}$StmiB') were influenced by preoperative overjet, vertical change of lower incisor (${\Delta}$L1V) and horizontal change of posterior nasal spine (${\Delta}$PNSH). Change of LiB' (${\Delta}$LiB') was influenced by ${\Delta}$L1V and ${\Delta}$PNSH. Change of SnMe' (${\Delta}$SnMe') was influenced by ${\Delta}$MeV, horizontal change of upper incisor (${\Delta}$U1H) and horizontal change of lower incisor (${\Delta}$L1H). ${\Delta}$Nasolabial angle was influenced by change of ULT (${\Delta}$ULT). Conclusion: Both soft tissues and hard tissues can be evaluated by CBCT. Posterosuperior rotation of maxillomandibular complex resulted in increase of upper lip philtrum length and nasolabial angle, while the upper lip vermilion length, lower lip philtrum length, lower lip vermilion length, and soft tissue lower facial height showed a decrease.

제강슬래그 아스팔트혼합물의 도로포장 성능 평가

이종민,이윤모,이진우,Lee, Jong-Min,Lee, Yun-Mo,Lee, Jin-Woo 한국건설순환자원학회 2021 한국건설순환자원학회지 Vol.16 No.2

${\beta}-Lactamase$ 억제작용이 기대되는 7-Arylidene Cephalosporanate 유도체의 합성

이종민,임철부,임채욱,Lee, Jong-Min,Yim, Chul-Bu,Im, Chae-Uk 대한약학회 2008 약학회지 Vol.52 No.4

The synthesis of 7-arylidene cephalosporanates for ${\beta}-lactamase$ inhibitor was described. The reactions of substituted benzyl halides $[1]{\sim}[3]$ with triphenylphosphine gave triphenylphcsphonium chlorides $[4]{\sim}[6]$. These phosphonium salts were treated with n-butyllithium to give ylides, which were reated with 7-oxocephalosporanate [7] by Wittig reaction to afford the 7-exomethylene cephalosporanates $[8]{\sim}[10]$. These cephalosporanates were oxidized to cephalosporanate sulfones $[11]{\sim}[13]$ with mCPBA. The deprotection of benzhydryl cephalosporanate $[8]{\sim}[13]$ with $AlCl_3$ and $NaHCO_{3}$ gave sodium salts of 7-arylidene cephalosporanates $[14]{\sim}[19]$.

원거리 화학영상탐지시스템의 시야각에 대한 연구

이종민,강영일,김주현,Lee, Jong-Min,Kang, Young-Il,Kim, Ju-Hyun 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1

Remote fourier transform infrared(FTIR) chemical imaging detection system allows detection and identification of gases in the atmosphere from long distances. In this paper, the appropriate field of view(FOV) of the FTIR imaging system was examined and the main performance of the system for the interferometer was described. For the determination of the FOV, simulations of gas dispersion range were performed with the NBC reporting and modeling software(NBC-RAMS) developed by ADD. As a result, minimum 192 mrad of FOV was required for the remote FTIR imaging system to visualize chemical warfare agents dispersed in several hundred meters. At the same time, 0.75 mrad of instantaneous field of view(IFOV) for a linear interferometer proper to take a FOV for the chemical agent imaging.

국내 중소기업 전자상거래 현황 및 활성화 방안에 관한 연구

이종민,Lee, Jong-Min 한국산학경영학회 2005 산학경영연구 Vol.18 No.1

전자상거래가 경제활동의 새로운 장으로 부각됨에 따라 이의 활용이 기업의 중요한 현안으로 등장하였다. 이에 따라 본 연구는 취약한 국내 중소기업의 전자상거래 활성화 방안 마련을 목적으로 현재 중소기업의 정보화 수준, e-비즈니스 활용 실태를 조사하였다. 조사결과 국내 중소기업의 PC, 인터넷 보급 등 기본적인 인프라는 만족한 수준이지만, 이들은 주로 사무자동화와 같은 기초적인 정보화 활용 수준에 그치고 있었다. 전자상거래 시스템 도입 등 본격적인 정보시스템 활용이 부진한 이유로는 중소기업의 정보화 인력, 기술, 자금 부족이 가장 큰 문제로 지적되었다. 이러한 상황을 고려할때 패키지 소프트웨어나 웹 호스팅 서비스의 보급에 의한 정보화 지원이 가장 적절할 것으로 판단되며, 정책적인 차원에서의 웹 기반 ASP(Application Service Provider)의 개발 및 보급과 자금지원, 교육, 자문을 구체적 방안으로 제시하였다. 또한 정보화 투자대비 효익에 대한 기업의 우려에 대해 우수사례 발굴과 홍보, BSC(Balanced Scorecard)를 통한 경영성과 측정지표의 개발이 필요하며, 이를 기반으로 효율성이 높은 분야에 대한 집중적 지원이 요구된다. This study attempts to investigate the IT utilization and e-business level of the small and medium companies in order to facilitate their e-commerce efforts. Results show that they have basic IT infrastructures such as internet and PC, but they use their IT resources mainly for office automations. Major problems with such low level of IT utilization are in their lack of manpower, skill, and fund. Considering above issues, web hosting service is believed as a good measure to alleviate their problems. Hence, this paper suggests that utilization of the web-based ASP can be a viable solution for the currently revealed issues. Also, development of creative IT application(business) cases and their advertizement can lead small and medium finns to more productive IT investments, which requires more diverse IT performance measurements such as BSC(balanced scorecard), other than traditional ROI.

차세대 네트워크에서의 이동성 제공 방안 비교

이종민,유명주,최성곤,Lee, Jong-Min,Yu, Myoung-Ju,Choi, Seong-Gon 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.12

현재 ITU-T, 3GPP, IETF 등에서 차세대 네트워크에 대한 연구가 활발히 진행되고 있다. 차세대 네트워크(NGN)에서 seamless service를 제공해주기 위해 mobility의 제공은 필수요소가 되었다. 이러한 mobility 기술로는 MIPv6, IP2, Q.MMF등이 있으나 아직 각 기술들이 갖는 이동성지원관련 성능을 분석하고 비교한 연구는 이루어지지 않고 있다. 따라서 각 성능 파라미터에 따른 제안된 방안들의 성능 비교가 요구된다. 이 논문은 MIPv6, IP2, Q.MMF의 mobility 과련 동작을 살펴보고, 각 메커니즘들의 위치등록 과정 동안 소요되는 시간과 비용을 조사하고 비교한다. 또한 NS-2를 이용한 시뮬레이션을 통해 각 프로토콜에서 핸드오버 시 발생하는 지연을 비교한다. 그 결과 위치등록 과정 동안 소요되는 시간과 비용 면에서 IP2가 다른 메커니즘들보다 좋은 성능을 보였다. 시뮬레이션을 통해 알아본 핸드오버 지연시간 면에서도 IP2가 가장 좋은 성능을 보였다. Various schemes for mobility are currently studied in ITU-T, 3GPP, IETF, and so on. Mobility support in NGN for seamless service is necessarily required. Currently proposed mechanisms are MIPv6, $IP^2$, and Q.MMF. However the performance comparison of all existing schemes is not examined as yet. That is, the existing methods need to be compared according to each performance parameter. So, in this paper, we investigate and compare the performances of MIPv6, $IP^2$, Q.MMF to location registration. In addition, this paper presents the performance comparison of handover latency times. For this, we use NS-2 simulator. As a result of analysis, $IP^2$ shown the best performance as it is measured the minimum time and cost. And it has low handover latency time in comparison with other mechanisms.

측두하악관절장애(TMD)환자의 기능적 회복을 위한 온열적용과 도수관절운동치료(Mobilization)의 비교연구

이종민,김헌면,문순주,윤정규,Lee, Jong-Min,Kim, Hun-Myun,Moon, Soon-Ju,Yoon, Jung-Gyu 대한물리치료과학회 2000 대한물리치료과학회지 Vol.7 No.2

A single experimental design (alternating treatment design) was used to compare the effects of the mobilization and heat therapy on the pain and mouth opening in patient with temporo-mandibular disorder (TMD). In the mobilization sessions, the physiotherapist performed two methods of the mobilization on the temporo-mandibular joints. In the heat therapy sessions, the patient received infrared and ultrasono on the temporo-mandibular joint. The mobilization and heat therapy were performed on alternate days during 10 days. Pain was measured by visual analogue scale (VAS) and mouth opening was measured by caliper. The results showed that mobilization and heat therapy were effective in pain reduce and mouth opening increase, and mobilization was superior to heat therapy in mouth opening increase and pain reduce.

순환유동층 발전설비를 이용한 바이오매스 연소 기술

이종민,Lee, Jong-Min 대한전기협회 2012 전기저널 Vol.- No.429

자기부상열차용 분기장치 개발현황

이종민,Lee, Jong-Min 재료연구소 2006 機械와 材料 Vol.18 No.2