제강슬래그 아스팔트혼합물의 도로포장 성능 평가

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

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.

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.

R28세포에서 고포도당이 반응성산소종의 생성에 미치는 영향

이종민,김재우,Jong Min Lee,Jae Woo Kim 대한안과학회 2010 대한안과학회지 Vol.51 No.5

Purpose: To investigate the effect of high glucose (HG) on the production of reactive oxygen species (ROS) in retinal precursor R28 cells. Methods: R28 cells were incubated with low glucose (5 mM) or HG (25 mM) for two days. Additionally, the cells were co-exposed to 50 μM N-acetyl cysteine or 100 μM L-arginine. Production of nitric oxide (NO), ROS, and superoxide were assessed by Griess assay, DCFH-DA assay, and modified cytochrome c assay, respectively. Results: HG increased the production of NO, ROS, and superoxide, which were abolished by antioxidants NAC and L-arginine (a substrate for NO production). Conclusions: HG increased ROS production in R28 cells. Thus, HG may cause cellular dysfunction and damage by inducing oxidative stress in retinal ganglion cells. J Korean Ophthalmol Soc 2010;51(5):746-750

말초 정맥주사를 통해 비항암제 발포성 약물을 투약한 성인 환자의 일혈 발생과 위험요인

이종민,이주희,장연수,김연희,Lee, Jong Min,Lee, JuHee,Jang, Yeon Soo,Kim, Yeon Hee 한국중환자간호학회 2018 중환자간호학회지 Vol.11 No.2

Purpose : This study aimed to investigate the incidence of intravenous extravasation and the risk factors associated with the use of peripheral intravenous catheters in adults. Method : This prospective observational study included 203 adult patients admitted to the general ward who received non-chemotherapy vesicant drug infusion treatments. Data were analyzed using frequencies, percentage, means, standard deviations, and odds ratios (ORs) from multiple logistic regressions. Results : The incidence of extravasation was 43.3%. Risk factors for intravenous extravasation included continuous injections (OR=5.35, 95% CI [1.38, 20.83]), and parenteral nutrition (OR=3.53, 95% CI [1.43, 8.73]). Conclusion : The present findings revealed that gastrointernal medicine problems, continuous injection, and parenteral nutrition were related to intravenous extravasation. Further research is necessary to reduce the incidence of extravasation related to peripheral intravenous catheterization in adults, and to prevent secondary complications. Finally, patients should be provided appropriate and continuous care based on the type of intravenous infusion.

개인휴대 통신망에서 공간적 국부성을 이용한 위치추적 방법

이종민,권보섭,맹승렬,Lee, Jong-Min,Kwon, Bo-Seob,Maeng, Seung-Ryoul 한국정보처리학회 2003 정보처리학회논문지 C : 정보통신,정보보안 Vol.10 No.2

무선단말기 사이의 호 연결을 위하여 유휴상태에 있는 무선단말기의 위치정보를 관리하는 위치추적방법이 사용된다. 본 논문에서는 움직임에 기반한 위치추적방법의 성능을 더욱 향상시키기 위하여 공간적 국부성을 이용한 위치추적방법을 제안한다. 제안한 방법은 무선단말기의 실제 이동경로에서 공간적 국부성을 제거하여 가상 이동경로를 생성한 후 이를 이용하여 위치 갱신함으로써 불필요한 위치갱신을 줄일 수 있게 한다. 컴퓨터 모의실험을 통하여 본 논문에서 제안한 방법이 위치추적경비를 많이 줄일 수 있음을 보여준다. Location tracking is used to keep track of the location information of a mobile terminal in an idle state for a call setup between mobile terminals. In this paper, we introduce a new location tracking strategy that utilizes spatial locality to have better performance than a movement based location tracking strategy. We reduce a lot of unnecessary location updates by updating the location information of a mobile terminal using the virtual movement path, which is generated after removing spatial localities in the actual movement path. Simulation results show that the proposed strategy greatly reduces the overall location tracking cost.

호도착기록에 기반한 위치갱신 알고리즘의 성능 분석

이종민,권보섭,맹승렬,Lee, Jong-Min,Kwon, Bo-seob,Maeng, Seung-Ryoul 한국정보처리학회 2003 정보처리학회논문지 A Vol.10 No.4

Location tracking is used to keep track of the location information of a mobile terminal in an idle state for a cail setup between mobile terminals. In this paper, we introduce a location update algorithm based on the call arrival history, which is appropriate for a variable call arrival rate over time. The location tracking strategy which uses the proposed algorithm can find changes in the call arrival rate by maintaining a call arrival history of a mobile terminal, from which a mobile terminal can calculate an appropriate timeout interval for a variable call arrival rate. We show that the proposed scheme is appropriate for a variable call arrival rate by presenting a simple analytical model and analytical results to investigate its performance for both a fixed and a variable call arrival rate. 무선단말기에 도착하는 호의 연결을 위해서 유휴상태에 있는 무선단말기의 위치정보를 관리하는 위치추적 방법이 사용된다. 본 논문에서는 시간이 지남에 따라서 호도착율이 변화할 때에 적합한 호도착기록에 기반한 위치갱신 알고리즘을 제안한다. 이 알고리즘을 사용한 위치추적방법은 무선단말기의 호도착기록을 사용하여 호도착율의 변화를 파악하고, 이를 사용하여 현재의 호도착율에 적합한 타임아웃 주기를 계산한다. 그리고 이 방법에 대한 성능을 평가하기 위하여 고정/가변 호도착율에 대한 분석 모델과 그에 따른 분석 결과를 제시함으로써 호도착율의 변화에 적합함을 보인다.

최소제곱법을 적용한 지적도근점측량 계산의 정확도 분석

이종민,정완석,이사형,Lee, Jong-Min,Jung, Wan-Suk,Lee, Sa-Hyung 한국국토정보공사 공간정보연구원 2015 지적과 국토정보 Vol.45 No.2

도근점측량과 같은 수평위치를 결정하는 방법 중 최소제곱법은 확률이론에 근거하여 잔차의 분산이 최소가 되는 조건을 만족하는 최확값을 산출하는 방법이다. 본 논문에서는 도선법으로 계산되는 현행 지적도근점측량의 성과와 최소제곱법을 적용한 도근점의 계산성과를 비교하고, 네트워크-RTK 측량결과와 각각의 조정방법에 대한 평균오차를 확인하였다. 실험 결과 최소제곱법이 도선법에 비해 폐합오차를 각 측점에 균등하게 배분하는 것을 확인하였으며, 네트워크-RTK 성과와의 평균오차도 도선법은 2.7cm, 최소제곱법은 2.2cm 산출되었다. 또한 과대오차가 발생한 경우 이를 확인하기 위한 방법으로 정방향 초기값과 역방향 초기값을 이용하여 수평각 과대오차를 확인할 수 있었으며, 관측된 측선거리와 계산된 측선 거리의 차이를 이용하여 거리 과대오차가 발생한 측선을 예측할 수 있었다. A least squares method for adjusting the horizontal network satisfies the conditions which is minimizing the sum of the squares of errors based on probability theory. This research compared accuracy of 3rd cadastral control points adjusted by traditional and least square method with respect to the result of Network-RTK. Test results showed the least square method more evenly distribute closure error than traditional method. Mean errors of least square and traditional adjusting method are 2.7cm, 2.2cm respectively. In addition, blunder in angle observations can be detected by comparing position errors which calculated by forward and backward initial coordinates. However, distance blunder cannot offer specific observation line occurred mistake because distance error propagates several observation lines which have similar directions.

표준·시험인증 기술 동향 - 저지연 고효율 실시간 방송을 위한 Mobile MMT(MPEG Media Transport) 기술 표준화 현황

이종민,조성민,박진효,Lee, Jong-Min,Jo, Seong-Min,Park, Jin-Hyo 한국정보통신기술협회 2016 TTA저널 Vol.166 No.-

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.