• 한국신뢰성학회지:신뢰성응용연구
• /
• 제10권4호
• /
• pp.279-297
• /
• 2010

AQS(Air Quality Control System) is the important part of a car air conditioning system. This device intercepts automatically the influx of harmful waste gas. In this paper reliability assessment criteria for AQS are established in terms of quality certification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.

• 한국항공운항학회지
• /
• 제24권3호
• /
• pp.48-54
• /
• 2016

This paper proposes a prediction model of air traffic controller's take-off clearance under mixed mode runway operations. The proposed model has its purpose on the better prediction of the air traffic controller's clearance on take-offs of departure aircraft by considering various factors. For this purpose, support vector machine classification algorithm is used for the proposed model. The proposed model is applied to real air traffic operations to demonstrate its performances.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2006년도 하계학술발표대회 논문집
• /
• pp.938-943
• /
• 2006

The primary purpose of a computer room of data center and associated infrastructure is to support the operation of critical IT equipment. Traditionally, most owners of large critical data centers have been more than willing to accept a reasonable amount of computer room worker discomfort if necessary to support critical IT systems. All electrical equipment produces heat, which must be removed to prevent the equipment temperature from rising to an unacceptable level. Most information technology equipment and other equipment found in a data center or network room is air-cooled. Sizing a cooling system requires an understanding of the amount of heat produced by the equipment contained in the enclosed space, along with the heat produced by the other heat sources typically encountered.

• 한국항공운항학회지
• /
• 제30권4호
• /
• pp.1-8
• /
• 2022

In this study, we propose trajectory-based arrival management using CDO (Continuos Descent Operations). The operational procedures with TBO (Trajectory-Based Operations) concept were established to allow aircraft and ground system to share the trajectories with each other in real time. The proposed operational concept was validated in the air traffic control simulation environment, which consists of controller working position, pseudo pilot system, air traffic generation system, and controllers' decision support system for arrival management using CDO. Simulation results compared with actual flight data indicate that proposed concept could improve the efficiency of traffic flow management in terms of total descending time and fuel consumption. And it was confirmed that if there is a system that can share and utilize the synchronized trajectory, it can be helpful to control arrival aircraft and apply CDO concept.

• 반도체디스플레이기술학회지
• /
• 제22권1호
• /
• pp.59-63
• /
• 2023

Various devices have been emerging as a means of measuring indoor air quality, and among them, there are devices that support real-time remote monitoring through IoT technology and a cloud environment. To improve indoor air quality, based on the results determined by measuring devices, air purifiers or ventilation systems may need to be operated, and temperature and humidity control may be required. In this paper, we propose a design of indoor air quality measuring devices required for indoor air quality evaluation, and of the system needed to control relevant devices to improve indoor air quality through the interaction with the measuring devices. Currently, the servers for the interaction of indoor air quality devices and IoT devices are divided into conventional server type and serverless type, comparing the differences in response time of IoT devices to changes of indoor air quality.

• Asian Journal of Atmospheric Environment
• /
• 제11권4호
• /
• pp.330-343
• /
• 2017

Climate change is an important issue, with many researches examining not only future climatic conditions, but also the interaction of climate and air quality. In this study, a new version of the emissions processing software tool - Python-based PRocessing Operator for Climate and Emission Scenarios (PROCES) - was developed to support climate and atmospheric chemistry modeling studies. PROCES was designed to cover global and regional scale modeling domains, which correspond to GEOS-Chem and CMAQ/CAMx models, respectively. This tool comprises of one main system and two units of external software. One of the external software units for this processing system was developed using the GIS commercial program, which was used to create spatial allocation profiles as an auxiliary database. The SMOKE-Asia emissions modeling system was linked to the main system as an external software, to create model-ready emissions for regional scale air quality modeling. The main system was coded in Python version 2.7, which includes several functions allowing general emissions processing steps, such as emissions interpolation, spatial allocation and chemical speciation, to create model-ready emissions and auxiliary inputs of SMOKE-Asia, as well as user-friendly functions related to emissions analysis, such as verification and visualization. Due to its flexible software architecture, PROCES can be applied to any pregridded emission data, as well as regional inventories. The application results of our new tool for global and regional (East Asia) scale modeling domain under RCP scenario for the years 1995-2006, 2015-2025, and 2040-2055 was quantitatively in good agreement with the reference data of RCPs.

• 한국대기환경학회지
• /
• 제16권4호
• /
• pp.381-388
• /
• 2000

Ceramic foam prepared with cordierite as a starting material by foam method was tested to evaluate the feasibility as a filter for the dust collection in hot gas. Two different types of agents Benzethonium chloride (BZTC, C27H42NO2Cl) and Sodium Lauryl Sulfate(SLS, CH3(CH2)11OSO3Na) were used as foaming agents in foaming process. Porosityof ceramic foam was about 80% and mean pore size were 100${\mu}{\textrm}{m}$ for SLS agent and 200 ${\mu}{\textrm}{m}$ for BZTC. It was observed that ceramic foam was composed of continuous macro-pore structure with opening windows interconnecting macro-pores. The surface of ceramic foam support of was coated with cordierite particles ranged from 20${\mu}{\textrm}{m}$ to 50${\mu}{\textrm}{m}$ Meso-pore size in the coating layer on ceramic foam was below 10${\mu}{\textrm}{m}$. While air permeability of the support increased with increasing macro-pore size coated ceramic filters showed a constant permeability without regard to the macro-pore size of the support. The permeabuilities of support varied in the range of 600$\times$10-13m2 to 1000$\times$10-13m2. For the case of coated ceramic filter it was about 200$\times$10-13m2. As a result of particle trapping test by using fly ash the particle removal efficiency was over the 99.9%.

• 디지털융복합연구
• /
• 제11권4호
• /
• pp.139-145
• /
• 2013

본 논문은 우리나라 항공화물 상용화주제도의 활성화를 위해 물류정책 및 제도를 알아봄으로서 일반화주의 상용화주 전환 및 확대에 필요한 제도 활용을 제안하는데 목적이 있다. 2012년에 "항공안전 및 보안에 관한 법률" 및 2011년 "상용화주 항공화물 보안기준"이 개정되었으나 그 목적이 항공안전과 보안, 항공화물의 보안통제 절차를 규정한 것이어서 상용화주제 활성화 방안은 포함되어 있지 않다. 따라서 상용화주제 활성화를 위하여 2012년 개정된 "물류정책기본법"의 물류보안 지원제도와 물류공동화 제도, 컨설팅 지원에 대한 활용방안을 제안한다.

• 한국정보통신학회논문지
• /
• 제25권2호
• /
• pp.320-326
• /
• 2021

비행체 점검장비는 기본적으로 항공기 임무수행을 위해 비행 전/후 탑재장비의 정상유무와 상태를 점검하기 위한 장비이다. 본 논문에서는 비행체 점검장비 내 무인항공기 운용 지원을 위한 기능을 식별, 설계 및 구현하고, 최초로 비행체 점검장비의 무인항공기 운용을 위한 추가적인 활용 방안을 제시한다. 제안하는 비행체 점검장비는 항공기의 임무 계획에 따라 변화하는 임무 및 영상 탑재장비의 초기설정 및 주요 정보를 통제하고, 주요 장비의 장착 및 위치보정 을 별도 지상 운용 장비 없이 수행할 수 있다. 또한 임무 간 비상상황 발생 시 착륙 후 이를 확인할 수 있는 영상 및 고장이력 역시 비행체 점검장비를 통하여 손쉽게 다운로딩 할 수 있다. 향후 타 무인기 체계 개발 시 본 논문에서 제시한 비행체 점검장비의 운용 지원 설계 방안을 적용하면 다수의 지상 운용 지원장비를 대체하여 추가적인 설계비용 및 운용 인력을 줄이고 항공기 정비사의 편의성을 획기적으로 향상 시킬 수 있을 것으로 기대한다.

• 소성∙가공
• /
• 제24권6호
• /
• pp.387-394
• /
• 2015

Air springs are designed to support loads using the volume elasticity in a cylindrical shaped air bag made of a composite material with a rubber matrix and two plies of reinforced fibers. Recently, applications of these springs have been expanded from railway vehicles to passenger cars. The current study presents a finite element analysis of a manufactured air spring for a passenger car. The analysis was conducted including the mounting steps of the air bag using a static loading condition. A method for controlling the internal pressure and displacements during the mounting step was developed. The characteristic load curve and the shape of the air bag were in good agreement with the experimental data with respect to the design height, the bump height and the rebound height. Results indicate that ply angles of fibers vary from 38 degrees to 56 degrees during static loading.