LDPC 부호 적용을 위한 Tanner의 최소 거리 바운드의 일반화

신민호,김준성,송홍엽,Shin Min Ho,Kim Joon Sung,Song Hong Yeop 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.10C

LDPC 부호의 검사행렬은 비트노드와 검사노드간의 이분 그래프로 표현된다. Tanner는 그래프상의 인접 행렬 (adjacency matrix) 고유값을 이용하여, 균일 LDPC 부호의 최소 거리 하한식(minimum 야stance bound)을 유도하였다. 본 논문에서는 Tanner의 결과를 일반화하여, 균일 및 블록 구조를 갖는 비균일 LDPC부호에 적용 가능한 두개의 최소 거리 하한식을 유도한다. 첫 번째는 최소 거리 부호어에 인접한 비트노드들의 관계를 통하여 유도되는 비트노드 기반 하한식이고, 두 번째는 최소 거리 부호어와 연접한 검사노드들의 관계에서 얻어지는 검사노드기반 하한식이다. 론 논문에서 유도한 하한식을 통하여 블록 구조를 갖는 비균일 LDPC부호의 거리 특성을 그래프의 고유값들과의 관계로 나타낼 수 있다. LDPC(Low Density Parity Check) codes are described by bipartite graphs with bit nodes and parity-check nodes. Tanner derived minimum distance bounds of the regular LDPC code in terms of the eigenvalues of the associated adjacency matrix. In this paper we generalize the Tanner's results. We derive minimum distance bounds applicable to both regular and blockwise-irregular LDPC codes. The first bound considers the relation between bit nodes in a minimum-weight codeword, and the second one considers the connectivity between parity nodes adjacent to a minimum-weight codeword. The derived bounds make it possible to describe the distance property of the code in terms of the eigenvalues of the associated matrix.

고속철도의 안전운행을 위한 강우시 열차운전규제기준의 제안

신민호,홍만용,이성혁,김현기,김정기,Shin, Min-Ho,Hong, Man-Yong,Lee, Seong-Hyeok,Kim, Hyun-Ki,Kim, Jung-Ki 한국방재학회 2003 한국방재학회논문집 Vol.3 No.2

건설중인 경부고속철도에서는 열차의 운행안전을 확보하기 위하여 다양한 안정시스템을 채택하고 있어 예기치 못한 재해발생으로 인한 인적 물적 피해의 최소화에 만전을 기하고 있으나, 국외규정이 도입되는 과정에서 국내 선로, 기후, 지형 지질학적 특성을 반영한 국내규정으로는 정립되어 있지 않은 현실이다. 따라서, 본 연구에서는 강우시 고속철도의 안전한 운행을 위해 현재 설정되어 운용 예정인 강우시 운전규제를 위한 경계우량의 문제점을 파악하고 보완함으로써 보다 합리적인 경계우량의 재설정이 가능하였다. 또한, 이를 이용하여 CTC 등의 중앙통제기구에서 정상운행 경계발령 열차속도규제 운전정지의 4단계로 강우상황에 따라 열차의 안전을 명확하게 확보할 수 있을 것이며, 자연재해 발생 최소화에 기여할 수 있을 것이라 판단된다. Korea High-Speed Railway has various safety systems to secure safe and stable transportation and makes assurance doubly sure to minimize casualty and property damage caused by natural disasters. But, there is no regulation that reflects domestic railway line, climate, topographical and geological characteristic in introducing the foreign regulations yet. Therefore, it is necessary for us to modify a regulation which is suitable to domestic high-speed railway. In this study, it is possible to establish more reasonable boundary rainfall by grasping and improving the troubles with existing boundary rainfall that is scheduled to be utilized for high-speed rail-transport operation control under rainfall. Also, it is possible to insure the safety of train by four steps such as 'normal operation', 'warning issue', 'train speed control' and 'train stop' using the established boundary rainfall. It will go far toward minimizing the occurrence of natural disasters.

어린이 보호구역 내에서 발생한 6-14세 어린이들의 보행 중 교통사고에 대한 역학적 조사

신민호,권순석,Shin, Min-Ho,Kweon, Sun-Seog 대한예방의학회 2005 예방의학회지 Vol.38 No.2

Objectives: Pedestrian traffic injuries have been an important cause of childhood mortality and morbidity for decades. The aim of this study was to describe the epidemiological characteristics of child pedestrian traffic injuries that occurred during 2000 in one metropolitan city and its school-zones, and to determine the factors associated with those accidents. Methods: A cross-sectional study was performed in 2001. Police records were used to identify the cases of pedestrian injury. Children aged between 6 and 15 years, injured during road walking, were included in this study. A direct survey of the environmental factors within the school-zones in study area (n=116) was also performed. Self-administered questionnaires, via mail and telephone surveys, were used to assess the safety education programmes. The schools were divided into two groups according to the occurrence of pedestrian traffic injuries in their school-zone. Results: Pedestrian injuries (n=597) were found to account for 3.2% of all traffic injuries in the subject area. The epidemiological characteristics were not significantly different between genders. There were some significant risk factors within the environmental factors, such as local road (OR: 2.3, 95% CI=1.05-5.35), heavy traffic volume (OR: 2.2, 95% CI=1.00-5.04), poor visibility of speed-limit signs (OR: 2.8, 95% CI=1.25-6.42), no separation of pedestrian routes from cars (OR: 2.6, 95% CI=1.02-6.75) and barriers on the pedestrian routes (OR: 2.2, 95% CI=1.01-5.08). Only one factor, that of education in a safety-park (OR: 0.3, 95% CI=0.09-0.96), was significantly associated in the traffic and pedestrian safety education factors. Conclusion: Significant associations with pedestrian injury risk were identified in some of the modifiable environmental factors than in the educational factors.

일부 농촌지역 주민의 혈청 leptin 농도와 비만지표의 관련성

신민호,박경수,최진수,김상용,Shin, Min-Ho,Park, Kyeong-Soo,Choi, Jin-Su,Kim, Sang-Yong 대한예방의학회 2000 예방의학회지 Vol.33 No.2

일부 농촌지역 주민을 대상으로 혈청 leptin농도와 비만지표의 관련성을 파악하고자 하였다. 역학조사에 참여한 주민 1036명 중 단순무작위표본추출하여 혈청 leptin 농도를 측정한 209명을 연구대상으로 하였다. 체질량지수, 체지방량 등의 비만지수는 신체계측, 생체전기저항분석법으로 측정하였으며 혈청 leptin농도는 면역 방사계수측정 법으로 측정하였다. 혈청 leptin농도는 비만지표인 체질량 지수, 체지방률, 체지방량, 허리둘레, 엉덩이둘레와 유의한 양의 상관관계가 있었다. 혈청 leptin농도는 과체중 또는 비만인에서 저체중 또는 정상인보다 유의하게 더 높았다. 혈청 leptin농도는 남자보다 여자에서 더 높았는데 체질량지수를 보정한 상태에서도 남자보다 여자에서 더 높았다. 혈청 leptin 농도는 남자에서는 허리둘레, 여자에서는 엉덩이둘레와 더 관련이 있어 높은 혈청 leptin농도는 남자에서는 복부형 비만, 여자에서는 둔부형 비만과 관련이 있는 것으로 나타났다. 본 연구에서 혈청 leptin 농도는 비만지표들과 양의 상관관계가 있었고, 정상인보다 비만인, 남자보다 여자에서 더 높았으며, 복부형 비만보다 둔부형 비만과 더 관련이 있었다. 이러한 결과는 비만이 leptin결핍보다는 leptin 저항성과 더 관련이 있다는 가설을 지지하는 것이다. Objective : To evaluate the relationship between serum leptin concentration and obesity indices in a rural population. Methods : Two hundred and nine subjects were randomly sampled from 1036 residents who had participated in the survey. Their obesity indices were measured by bioelectrical impedance analysis and anthropometry. Serum leptin concentrations were measured by immunoradiometric assay. Results : Serum leptin concentrations were positively correlated with body mass index, percent of body fat, fat mass, waist circumference, and hip circumference. Serum leptin concentrations were higher in obese or overweighted subjects than normal or thin subjects(8.5[0.9-31.4] compared with $2.7[0.1-12.0]{\mu}g/L$, p<0.01). Serum leptin concentrations were higher in women than men, even after an adjustment to body mass index$(\beta=4.183,\;p<0.01)$. According to body composition, serum leptin concentrations were more related with waist circumference in men, hip circumference in women. Conclusions : Serum leptin concentrations are positively correlated with obesity indices. Serum leptin concentrations are higher in obese subjects, in women, and more related with peripheral obesity. These findings support the hypothesis that human obesity is associated with leptin-resistance rather than leptin-deficiency.

철도인프라 BIM 성과관리를 위한 업무 및 성과기록 표준 템플릿 개발

신민호,김환용,최영우,한상천,Shin, Min-Ho,Kim, Hwan-Yong,Choi, Young-Woo,Han, Sang-Cheon 한국BIM학회 2020 KIBIM Magazine Vol.10 No.4

Recently, the government has actively promoted the introduction of BIM at the national level to improve the efficiency and productivity of the construction industry, and private interest in the application of BIM has also increased. However, despite the large amount of references and information, not much research has been done in quantitative ways to accurately measure the performance of BIM projects. The purpose of this study is to review performance measurement cases using ROI, investment effect analysis, and queue model analysis using domestic and overseas BIM guideline research and to present standard templates that can quantitatively measure BIM performance records according to domestic conditions based on this. Performance measurement trends and cases according to the application of BIM were analyzed, and nine quantification elements were derived from this, and based on this, a performance measurement data collection template at the BIM life cycle stage was prepared. Detailed items and contents were prepared for the nine quantification elements, and the final template consisted of a total of 43 questions, divided into the entire stage (15), the beginning (8), the middle (8), and the latter (12) areas. It is expected that by using the standard template of railway BIM performance records developed in this study, the BIM design stage will be diagnosed and the deficiencies will be supplemented, which will be the basic data for measuring actual quantitative performance in all life cycle performance of future BIM projects.

덱사메타손 임플란트 주입술 치료 후 재발된 점상내측맥락막병증 1예

신민호(Min Ho Shin),강현지(Hyun Ji Kang),정인영(In Young Chung) 대한안과학회 2017 대한안과학회지 Vol.58 No.11

목적: 점상내측맥락막병증에서 전신 스테로이드 부작용으로 유리체강 내 덱사메타손 임플란트 주입술로 치료하고 이를 문헌고찰과 함께 보고하고자 한다. 증례요약: 양안 고도근시인 23세 여자 환자가 우안에 발생한 점상내측맥락막병증으로 전신 스테로이드 치료 중 호전되는 경과를 보였 으나 안면부종, 수면장애 등 부작용으로 전신 스테로이드를 중단하고 덱사메타손 임플란트 유리체강 내 주입술을 시행하였다. 주입술 3개월 후 우안의 급격한 시력저하를 호소하였다. 당시 우안 최대교정시력은 안전 수동이었고, 빛간섭단층촬영에서 우안 맥락막신생혈 관이 관찰되었으며 인도시아닌그린안저혈관조영에서 후기에 다발성의 저형광병변들이 첫 방문 때보다 현저히 증가하였다. 전신 스테 로이드 치료와 유리체강 내 베바시주맙 주입술을 시행하였다. 6개월 후 우안 시력이 회복되었고, 맥락막신생혈관도 호전되었다. 결론: 점상내측맥락막병증에서 전신 스테로이드 부작용으로 유리체강 내 덱사메타손 임플란트 주입술 치료를 시행하였으나 3개월만에 합병증과 함께 재발하였기에 관련 치료 경험을 보고하고자 한다. Purpose: To report a case of punctate inner choroidopathy (PIC) treated with an intravitreal dexamethasone implant due to side effects of systemic steroid treatment. Case Summary: A 23-year-old highly myopic female who presented with PIC in her right eye was treated with an intravitreal dexamethasone implant due to side effects of systemic steroid treatment including facial edema and sleep disturbances. Three months after the implant she complained of severe acute visual disturbances in her right eye. Her visual acuity was classified as hand movement. Choroidal neovascularization (CNV) was observed on optical coherence tomography and indocyanine green angiography revealed more multiple hypofluorescent lesions compared to the initial visit. Six months after the systemic steroid and intravitreal bevacizumab injection treatments, visual acuity in right eye improved and the CNV disappeared. Conclusions: This report describes a case of PIC after, treatment with an intravitreal dexamethasone implant due to the side effects of systemic steroid treatment, which recurred with complications. J Korean Ophthalmol Soc 2017;58(11):1282-1288

급수가열기 동체 감육 현상 규명을 위한 유동해석 연구

신민호(Min Ho Shin),황경모(Kyeong Mo Hwang),김경훈(Kyung Hoon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4

There are multistage preheaters in the power generation plan to improve the thermal efficiency of the plant and to prevent the components from the thermal shock. The energy source of these heaters comes from the extracted two phase fluid of working system. These two-phase fluid can cause the so-called Flow Accelerated Corrosion(FAC) in the extracting piping and the bubble plate of the heater for example, in case of point Beach Nuclear Power Plant and in the Wolsung Nuclear Power Plant. The FAC is due to the mass transport of the thin oxide layer by the convection. FAC is dependent on many parameters such as the operation temperature, void fraction, the fluid velocity and pH of fluid and so on. Therefore, in this paper velocity was calculated by FLUENT code in order to find out the root cause of the wall thinning of the feedwater heaters. It also includeed in the fluid mixing analysis model are around the number 5A feedwater heater shell including the extraction pipeline. To identify the relation between the local velocities and wall thinning, the local velocities according to the analysis results were compared with distribution of the shell wall thickness by ultrasonic test.

배터리 온도를 고려한 병렬형 LDC 시스템의 방전 제어 기법

신민호(Min-Ho Shin),엄태호(Tae-Ho Eom),김준모(Jun-Mo Kim),이정(Jeong Lee),김성훈(Sung-Hoon Kim),이용석(Yong-Seok Lee),이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.3

This paper proposes paralleled structure of LDC for an electrical vehicle, unlike conventional integral structure, paralleled structure of LDC controls each module of battery independently to solve the temperature unbalance problem among each module during discharging period. Temperature balance control between modules was performed by controlling the amount of discharging current for its corresponding temperature of each module of HVBAT, and temperature fluctuation was confirmed through a thermal camera. Data was collected by experiment about characteristic fluctuation of a battery according to temperature and validity of proposed control method is also proved by experiment.

강우시 철도 성토사면의 안정성 평가에 관한 연구

신민호(Shin Min-ho),박영곤(Park Young-kon),이성혁(Lee Seong-Hyeok),김현기(Kim Hyun-ki),김경태(Kim Kyoung-tae) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-

In order to evaluate the stability of railway embankment under rainfall, explanatory variables and subordinate variables were selected for multivariate analysis. Furthermore the site which had occurred failure due to rainfall was investigated, and by executing multivariate analysis for 121 cases, critical rainfall was defined by the case that had high value of correlation factor. The maximum hourly rainfall during 24 hours before failure caused the collapse of railway embankment and could be used estimate the stability of railway embankment. From the result of application to a collapse example, the evaluaton method by critical rainfall curve is satisfactory.

미분탄 스월버너에서 PKS와 석탄 혼소가 화염 구조에 미치는 영향

신민호(Minho Shin),성연모(Yonmo Sung),최민성(Minsung Choi),이광수(Gwangsu Lee),최경민(Minsung Choi),김덕줄(Duckjool Kim) 한국연소학회 2016 한국연소학회지 Vol.21 No.4

Flame structure of co-firing coal and palm kernel shell (PKS) was investigated in a pulverized coal swirl burner by particle image velocimetry (PIV). The pulverized coal swirl flame is operated with a PKS blending ratio of 10%, 20%, and 30%. For all operating conditions, flame structures such as internal recirculation zone (IRZ), outer recirculation zone (ORZ), and exhaust tube vortex (ETV) were observed. In the center of flame, the strong velocity gradient is occurred at the stagnation point where the volatile gas combustion actively takes place and the acceleration is increased with higher PKS blending ratio. OH radical shows the burned gas region at the stagnation point and shear layer between IRZ and ORZ. In addition, OH radical intensity increases for a co-firing condition because of high volatile matter from PKS. Because the volatile gas combustion takes place at lower temperature, co-firing condition (more than 20%) leads to oxygen deficiency and reduces the combustibility of coal particle near the burner. Therefore, increasing PKS blending ratio leads to higher OH radical intensity and lower temperature.