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Study on the Flow Characteristics in the Channel with Corrugated Wall
YongHan Shin(신용한),ZhenHua Jin(김진화),S. Wibowo(위보워),Li XueSong(이설송),HanShik Chung(정한식),HyoMin Jeong(정효민) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In this paper, presented pressure drop characteristics in a channel of plate heat exchanger by experimental method. Plate Heat Exchanger(PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performances, extremely compact design and flexibility of extend or modify to suit changed duty. In the experiment, test section constructed by two corrugated plates with 60 degree of chevron angle. Consequently, experiments carried out the pressure profile along 15 measure points according to mass flow rate. This results provided to investigate flow characteristics of PHE channel flow that highly turbulent even with low Reynolds number. Moreover, numerical simulation was compared with experimental results and present flow behavior in the test section.
신용한(Yonghan Shin),사이드(S.M. Sayeed-Bin-Asad),전영철(YoungChul Jeon),정한식(Hanshik Chung),정효민(Hyomin Jeong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A numerical simulation on the flow field was carried out to improve cylindrical shell with baffle. The steady incompressible 3-D Navier-Stokes solution is obtained with the actual operational condition and geometry of the heat exchanger. The effect of the location of inlet and outlet on the cylindrical shell with baffle is investigated by varying flow rate. The present results show that the pressure drop is dependent on Reynolds number in the inlet area and position of inlet and outlet; i.e., the pressure drop increases with increasing Reynolds number and the pressure drop decreases with increasing angle between baffle cutting part and position of inlet and outlet.
Characteristics of Ultrashallow Hetero Indium–Gallium–Zinc–Oxide/Germanium Junction
Juhyeon Shin,Jaewoo Shim,Jongtaek Lee,Seung-Ha Choi,Woo-Shik Jung,Hyun-Yong Yu,Yonghan Roh,Jin-Hong Park IEEE 2012 IEEE electron device letters Vol.33 No.10
<P>In this letter, we demonstrate an n-indium-gallium-zinc-oxide (IGZO)/i-germanium (Ge) heterojunction diode with an ultrashallow junction depth of ~ 37 nm. X-ray diffraction, atomic force microscopy, and secondary ion mass spectrometry analyses are performed to precisely investigate the n-IGZO and n-IGZO/i-Ge junctions. When the junction diodes are annealed at between 400 °C and 600 °C, a very high on-current density (180-320 A/cm<SUP>2</SUP>), which is comparable to that of a Ti/i-Ge reference junction, is obtained. In particular, after the 600 °C anneal, a fairly high on/ off-current ratio (7×10<SUP>2</SUP>) is also observed.</P>
선진 사례 벤치마킹을 통한 국내 모듈러 건축 시공 프로세스 제안
신현규,안용한,Shin, HyunKyu,Ahn, YongHan 한국건설관리학회 2016 건설관리 : 한국건설관리학회 학회지 Vol.17 No.6
본 연구의 목적은 모듈러 건축 프로젝트를 수행하는데 발생할 수 있는 위험요인을 도출하고, 해외 선진사례 분석을 통해 도출한 관리요소를 벤치마킹함으로써 국내 적용 가능한 모듈러 건축 시공 프로세스를 제안하는 것이다. 본 연구를 수행하기 위해 해외 대표적인 모듈러 건축 사례인 미국 애틀랜틱 야드 B2 프로젝트를 분석하고 내용분석법을 통해 모듈러 건축 시공 단계에서 발생할 수 있는 위험요인을 도출하였다. 본 연구결과인 모듈러 건축 시공 프로세스를 기반으로 모듈러 건축 설계, 제작 단계부터 시공 단계에 발생되는 위험요인을 고려하여 관리한다면, 시공 과정에서 발생할 수 있는 잠재적인 위험요인을 사전에 방지하고, 시행착오를 줄여 모듈러 건축 시공성도 향상시킬 수 있을 것이다. 또한, 모듈러 건축 프로젝트를 효율적으로 관리함으로써 모듈러 공법의 장점인 공기 단축 및 공사비 절감을 실현하고, 결과적으로 시공품질을 확보하여 모듈러 건축 활성화에 기여할 수 있을 것이다. The purpose of this study is to provide a domestic applicable modular building construction process by benchmarking international best practices. In this study, we derive the risk factors that may occur in performing a modular construction projects and the modular construction management factors through case analysis. In order to effectively respond to risks in performing a modular building projects, we propose the modular building construction process which is separated by a transportation, lifting, assembly steps based on the unit module construction sequence. It is the key to providing management information and guidelines for the design, production, construction participants by reflecting the information for each step in the process. This study would prevent a potential hazard which may occur in the construction process. Consequently, It could result in saving the entire cost of modular construction project as shortening the project schedule and could improve workability of modular construction.
모듈러 공법의 시공 프로세스 기반 시공 오차 관리 의사 결정 모델
신현규,김수영,안용한,Shin, HyunKyu,Kim, SuYoung,Ahn, YongHan 한국건설관리학회 2017 한국건설관리학회 논문집 Vol.18 No.6
최근 모듈러 공법을 활용한 중 고층 건축 기술이 개발되면서 현장 시공 오차 관리의 중요성이 부각되었다. 모듈러 공법은 공장 생산 특성 때문에 현장에서 시공 오차를 조정하는 것이 매우 제한적이다. 따라서 시공 오차를 사전에 예방하기 위해서는 모듈러 공법 특성을 반영한 관리 방안이 필요하며 각 단계별 공사 참여자의 의사 결정이 중요하다. 이에 본 연구에서는 모듈러 공사 시공 오차 요인을 분석하고, 시공 프로세스 기반의 시공 오차 관리 방안 의사 결정 지원 모델을 제안하였다. 본 연구의 결과물은 모듈러 공사 참여자가 시공 오차 관리 방안을 도출하는데 가이드라인 역할을 할 수 있을 것이라 기대한다. Recently, the development of middle and high-rise building technology using modular construction method has emphasized the importance of site construction error management. The modular construction method is very limited to adjust the construction error in the field because of the factory production characteristics. Therefore, in order to prevent the construction error in advance, a management plan reflecting the characteristics of the modular construction method is required, and it is important to make the decision of the construction participant at each stage. This study analyzed the factor of construction error of modular construction and suggested a decision support model for construction error management based on construction process. The result of this study is expected to be a guideline for the modular construction participant to derive the construction error management plan.
정효민(Hyomin Jeong),신용한(Yonghan Shin),사이드(S.M. Sayeed Bin Asad),박진관(Chenkuan Park),정한식(Hanshik Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
LNG(Liquified Natural Gas) must be vaporized to be used as fuel in the industries, home application and soon. The cold energy generated about latent heat of 120 ㎉/㎏ and 80 kca/㎏ of sensible heat, while the vaporization process. Because air type vaporizer can't effect its vaporization performance properly due to the condensation of moisture in air outside the vaporization of moisture in air outside the vaporizer, 2~3 vaporizers are used alternately. To prevent freezing on the surface of vaporizer and solve the low performance, The heating source of gasification will use the geothermal energy. In this study, as the fundamental investigation to develop the highly efficient LNG vaporizer, When cold energy (Heat Flux : -100, -200, -300 W/m2) is connected to the ground, The soil temperature have been investigated numerically by the unsteady heat conduction equation.
조사로봇의 재난현장 활용을 위한 다중센서모듈 개발 및 성능평가에 관한 연구
정용한,홍준우,한수희,신동윤,임언택,김성삼,Jung, Yonghan,Hong, Junwooh,Han, Soohee,Shin, Dongyoon,Lim, Eontaek,Kim, Seongsam 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Disasters that occur unexpectedly are difficult to predict. In addition, the scale and damage are increasing compared to the past. Sometimes one disaster can develop into another disaster. Among the four stages of disaster management, search and rescue are carried out in the response stage when an emergency occurs. Therefore, personnel such as firefighters who are put into the scene are put in at a lot of risk. In this respect, in the initial response process at the disaster site, robots are a technology with high potential to reduce damage to human life and property. In addition, Light Detection And Ranging (LiDAR) can acquire a relatively wide range of 3D information using a laser. Due to its high accuracy and precision, it is a very useful sensor when considering the characteristics of a disaster site. Therefore, in this study, development and experiments were conducted so that the robot could perform real-time monitoring at the disaster site. Multi-sensor module was developed by combining LiDAR, Inertial Measurement Unit (IMU) sensor, and computing board. Then, this module was mounted on the robot, and a customized Simultaneous Localization and Mapping (SLAM) algorithm was developed. A method for stably mounting a multi-sensor module to a robot to maintain optimal accuracy at disaster sites was studied. And to check the performance of the module, SLAM was tested inside the disaster building, and various SLAM algorithms and distance comparisons were performed. As a result, PackSLAM developed in this study showed lower error compared to other algorithms, showing the possibility of application in disaster sites. In the future, in order to further enhance usability at disaster sites, various experiments will be conducted by establishing a rough terrain environment with many obstacles.