2018 평창동계올림픽 핵심교통시설, 원주∼강릉 철도 개통 의미와 효과

노병국 한국철도학회 2017 철도저널 Vol.20 No.5

사질성 지반에서 이수식 쉴드 TBM 적용시 굴진면으로의 이수 침투특성에 대한 해석적 고찰

노병국,고성일,추석연,Roh, Byoung-Kuk,Koh, Sung-Yil,Choo, Seok-Yeon 한국터널지하공간학회 2012 한국터널지하공간학회논문집 Vol.14 No.3

본 논문은 이수식 쉴드 TBM 굴착시 굴착면 안정에 큰 영향을 미치는 굴착면의 이수 침투에 따른 이막형성여부에 대하여 해석적 고찰을 수행하였다. 이러한 해석적 접근은 이수식 쉴드 TBM의 계획 및 설계시 최적 장비 형식 선정 및 시공계획 수립에 참고가 될 수 있으나, 이제까지 이에 대한 효과적인 해석적 방법에 대하여 제안된 것이 없는 상황이다. 따라서 본 논문에서는 사질토 입자의 모델링에 효과적인 $PFC^{2D}$의 Fluid Coupling simulation을 이용하여 해석을 수행하였으며, 해석결과, 이수침투 특성은 굴착 대상지반의 투수성과 이수특성(비중, 점성계수등)에 따라 변화됨을 파악할 수 있었다. 본 해석적 접근방법을 통하여 이수식 쉴드 TBM의 계획 설계단계에서 대상지반 특성을 고려한 이수 점도관리 방안 수립과 함께 시공중의 초기굴진단계에서의 최적 이수점도의 재검증을 통하여 안전한 터널시공에 도움이 될 것이라 판단된다. This paper presents numerical analysis of the mud cake infiltration behaviour which is influenced tunnel face stability during excavation by slurry shield TBM. This analysis method can make useful data to select proper shield TBM type and to set up the construction plan. But effective analysis did not proposed until now. In this paper, we carried out numerical analysis using by $PFC^{2D}$ fluid coupling simulation which is suitable for sandy soil modelling. As a analysis result, we checked that the slurry infiltration behaviour varied with soil permeability and slurry characteristic(specific weight, viscosity etc). This analysis method is helpful safety excavation through anticipating the proper slurry viscosity at the design stage and verifying the slurry quality at initial excavation stage.

Smartphone-based O₂ Deficiency Monitoring Device

노병국,Loh, Byoung Gook The Korean Society of Safety 2015 한국안전학회지 Vol.30 No.6

$O_2$-deficiency related accidents occur every year and the most effective way to prevent them is to measure $O_2$ concentration in air with a properly-calibrated $O_2$ monitoring device before entering low-$O_2$ areas. An electro-chemical sensor, Texas Instrument gas platform, and iPhone are used to construct a smartphone-based $O_2$ monitoring device. The smartphone based $O_2$ measuring approach offers advantages of small size, accessibility, internet-connectivity, and programmability in comparison to conventional $O_2$ measuring devices. Multiple gas sensors can be conveniently interfaced to single smartphone, allowing for creating a network of gas sensors distributed across workplaces and remote monitoring via existing mobile communication network. To check proper function of the $O_2$ monitoring device the sensor was exposed to shallow and deep human breaths. The readings decreased immediately after being exposed to exhalation and recovered during inhalation to a calibrated level of 20.9%. When readings decreased below a preset warning value of 19.5%, a low $O_2$ warning was successfully activated on the smartphone.

Kinematic Analysis of 7 Degrees of Freedom Upper-limb Exoskeleton Robot with Tilted Shoulder Abduction

노병국,Jacob Rosen 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.

An exoskeleton robot is a hybrid between human and robot where the two are mechanically integrated to function as one intelligent as well as powerful robot. This study presents a kinematic analysis of 7degrees of freedom (DOF) exoskeleton robot with its base rotational axis skewed to avoid singularity within workspace and to maximize ease of movement in all directions. The tilt of the base rotational axis configures the exoskeleton robot into an initial posture to which it is difficult to identify a geometric transformation from a kinematical model with all joint angels set to zero. When the limbs of the exoskeleton robot are configured either vertical or parallel to the ground, the resulting configuration can be initialized and then, ensuing kinematic analysis can be more conveniently performed from this nominal configuration. An analytical relationship defining a geometric transformation from the skewed configuration to the user-defined nominal configuration is developed and an explicit closed-form inverse kinematic solution for the 7 DOF exoskeleton robot is also presented.

반개착식 터널 공법에 관한 수치 해석적 연구

노병국,박종관,백승규,Roh, Byoung-Kuk,Park, Jong-Kwan,Baek, Seung-Kyu 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.2

최근 터널 갱구부와 저토피 구간에 대한 환경 친화적인 터널공법에 대한 관심이 증가하고 있다. 콘크리트 슬래브를 이용한 반개착식 터널공법을 적용한 연구 및 시공사례가 증가하고 있으나, 하중조합 및 아치콘크리트의 단면에 대한 별도의 적용 기준이 없다. 따라서 본 연구에서는 반개착식 공법에 대한 기준을 제시하기 위하여 지반조건과, 터널 상부 지층 두께, 되메움 두께, 상부지반 지표면의 경사 각도를 변화시키는 등의 다양한 조건들에 대하여 수치해석을 수행하였다. 수치해석 결과들을 회귀분석법으로 분석하고, 유도된 회귀 분석식을 분류하고 정리하여 합리적이고, 경제적이며, 안전한 반개착식 터널 굴착 공법의 기준을 제안하고자 하였다. Recently there has been increased interest for the portal and shallow tunnel for an eco-friendly tunneling method. Semi cut & cover tunnel excavation techniques applied to concrete slab and construction and a growing number of cases, but there is no load combinations and arch concrete cross section for the applicable standards. Therefore, in this study, ground conditions and tunnel overburden thickness, thickness of backfill, overburden surface slope angle changes to a variety of conditions in order to propose standards for the semi cut & cover method was performed numerical analysis. Regression analysis method to the analysis of the results of numerical analysis, and linear regression equations derived to classify and organize a rational, economical, and safe semi cut & cover tunneling method based proposed.

HMR제품의 선택속성이 고객만족 및 타인추천에 미치는 영향 연구

노병국 (사)한국관광레저학회 2019 관광레저연구 Vol.31 No.2

This study looked at the effect of the choice attributes of HMR products on customer satisfaction. In addition, the company identified the relationship between consumers' recommendations for others after purchasing them and analyzed them effectively and presented the desired direction. This study was conducted for about a month from December 1, 2018 and 376 effective questionnaires were used as final analysis for customers who continued to use HMR products. The choice attribute of HMR product, an independent variable in this study, was divided into four sub-factors: health, product quality, price and convenience, and looked at how it affects customer satisfaction and others' promotion. It was analyzed that health, product quality, price and convenience all had significant positive effects among the four factors as sub-factors of HMR selection attributes, but they had no effect on health factors. It was also analyzed that the results of a regression analysis by setting the independent variable to customer satisfaction and setting the dependent variable, other factors, to the variable had a significant positive effect.

흰쥐 늑연골의 조직학적 구조와 5FU의 영향

노병국,유양석,김준영 高麗病院 1987 高醫 Vol.10 No.-

입자 영상 유속계를 이용한 초음파 수직진동에 의해 유도된 공진상태에서의 음향유동에 관한 연구

노병국,이동렬 한국음향학회 2004 韓國音響學會誌 Vol.23 No.5

28.5 ㎑의 초음파의 미세 수직진동에 의해서 유도된 음향유동 (acoustic streaming)을 레이저를 이용한 입자 영상. 유속계에 의하여 고정 유리 평판과 초음파 진동자의 사이에서의 공기 유동을 가시화 하였다. 음향유동에 의한 공기의 유동 속도의 증가를 측정하기 위해 고정 유리 평판과 초음파 진동자의 사이에서의 속도변화를 실시간으로 측정하였다. 진동자와 고정 평판의 사이의 gap에 따른 음향유동의 세기의 변화를 정량적인 공기의 유동 속도의 변화에 의해 관찰되었고 고정판과 초음파 진동자 사이의 gap에서 공진 상태를 야기시키는 공진 Gap (H=18, 24, 30, 36㎜)중에서 공진 Gap (H)이 18m일 때 최대의 음향속도가 존재함을 알 수 있었고 진동자 표면부근에서부터 고정평판사이까지의 국소 최대 난류강도의 축 방향 위치에 따른 변화는 gap의 크기에 따라 8%∼70% 이었다. 전단응력값은 반경방향 위치의 중심영역에서 최대전단응력을 가지며 와도 분포도 반경방향 위치에서 진동자 중심영역에 최대 및 최소와도 값을 가짐을 알 수 있었다. Acoustic streaming induced by the microscopic longitudinal ultrasonic vibration at 28.5 ㎑ is visualized between the quiescent glass plate and ultrasonic vibrator by particle imaging velocimetry(PIV) using laser. To investigate the augmentation of air flow velocity of acoustic streaming. the velocity variations of air streaming between the stationary plate and ultrasonic vibrator are measured in real-time. It is experimentally investigated that the magnitude of the acoustic streaming dependent upon the gap between the ultrasonic vibrator and stationary p1ate results in the variations of the average velocity fields as a outcome of the bulk air flow caused by the ultrasonic vibration. In addition. maximum acoustic streaming velocity exists at resonant gap. 18mm that is one of the resonant gaps (H=18, 24, 30, 36㎜) at which resonance occurs. The variation of the local maximum turbulent intensity with axial direction appear to reveal the value of 8%∼70% dependent upon the gap between the quiescent glass plate and ultrasonic vibrator. Shearstress is also maximized at the center region of the vibrator and the vorticity is also maximum and minimum in the neighborhood of the center of the vibrator at which the local maximum turbulent intensity and shear stress exist.

태백정선철도

노병국 한국철도학회 2013 철도저널 Vol.16 No.3

쇄골에 발생한 만성 화농성 골수염 1예

노병국,강병권,최영안,김준영 高麗病院 1987 高醫 Vol.10 No.-