자동화 기법을 적용한 선체 저항 및 자항 해석

전제형,김태훈,권재웅,정영준 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5

본 연구에서는 KCS 선형에 대한 저항 및 자항, 프로펠러 단독 성능 해석의 결과를 시험과 비교하여 CFD 접근의 유용성을 검증하고자 하였다. 씨디어댑코 코리아 에서 제공하는 STAR-CCM+를 사용하여 해석을 진행 하였으며 수행된 해석 기법의 검증을 거쳐 매크로 자동화를 통해 업무의 효율성과 사용자 편의를 향상시키고 사용자의 실수에 의한 데이터 오류를 줄이고자 하였다. 저항해석을 수행함에 있어 Heave와 Pitch 운동을 고려함으로써 자세변화로 인한 선체 저항 및 유동장의 변화를 알아 보았으며, 자항해석을 수행하기 위해 Sliding Mesh를 적용하여 자항점 유추에 있어서의 유효한 결과를 도출하였다.

코로나19 팬데믹 이후 승무원 피로관리시스템 개선방안 연구

전제형,성화영,천수아,정근화 한국항공운항학회 2023 한국항공운항학회지 Vol.31 No.1

The aviation industry has continued to grow despite the influence of external environmental factors such as SARS and MERS. However, this growth has led to a sharp decrease in air traffic and a crisis of flight suspension due to the collapse of the global value chain and the decline of the world economy as the World Health Organization (WHO) declared a COVID-19 pandemic. Due to the decrease in the number of international flights, aviation workers such as pilots and cabin crew were exposed to high psychological stress and fatigue, such as large-scale layoffs, job instability, decrease in income, and increased risk of infection during. Recently, the international community has eased immigration restrictions through quarantine activities, and airlines are taking a step further to recover existing air demand. However, during the crisis period, a significant number of professional workers have been turned off or fired, and the physical and mental fatigue of those who can perform their duties is increasing. Therefore, this paper intends to examine the direction of policy improvement and the identification of problems in aviation safety and fatigue management after the pandemic.

RSARA분석을 통한 양양국제공항 활성화 방안

전제형,송제환,송병흠 한국항공경영학회 2015 한국항공경영학회 추계학술대회 Vol.2015 No.-

도로·철도·항만 등과 같이 생산 활동에 직접적 기여하지 않지만 경제활동을 원활하게 하기위한 사회간접자본 (SOC)은 공공재로서 반드시 필요한 기반시설이다. 주로 사회간접자본은 막대한 예산이 투입되며 대부분 정부나 공공기관이 중심으로 건설되어졌으며 경제성장에 일정수준 기여 하여왔다. 그러나 현재에 이르러 정치권의 포플리즘(Populism)과 지역개발 등의 기대효과를 바라는 지자체의 무리한 투자로 이어지면서 공공재의 성격이 변질되어갔다. 이와 같은 사례로 건설되어진 SOC로 각 지방의 국제공항들을 꼽을 수 있다. 이렇게 건설되어진 각 공항들은 본래의 기능을 하지 못하며 계속된 적자로 인한 세금의 낭비와 고도제한과 같이 지역주민의 재산권에 오히려 악영향을 미치게 되었다. 또한 계속된 적자 운영으로 인하여 항공기의 대형화 및 기술의 고도화에 걸 맞는 최신 항행시설 및 설비를 갖추지 못하게 되었고 이로 인하여 항공사의 유치 및 공항 간의 경쟁에서도 우위를 가질 수 없게 되었다. 따라서 본 연구에서는 공항활성화에 어려움을 겪고 있는 양양국제공항을 중심으로 분석해보았다. 현재 양양공항의 경우 평창동계올림픽으로 인한 항공편의 증대를 안전하게 관리하기 위해 차세대항행시스템의 구축계획으로 다변측정감시시설(MLAT) 설치 방안이 진행 중이다. 이러한 시스템의 구축 게획을 바탕으로 해당공항에 역할 및 규모에 맞는 차세대항행시스템의 적용과 함께 대형기를 수용할 수 있는 활주로 확장을 RSARA평가를 통해 안전성 확대 및 증대로 대형기의 운항, 기착지 및 대체 공항의 역할을 수행할 수 있는 공항으로서 항공 산업 발전 방향을 제시해 보았다.

AHP 분석을 통한 인천국제공항 환승객 증대방안에 대한 연구

전제형,송제환,유수준,이준오,유광의,Jeon, Je-Hyung,Song, Je-Hwan,Yoo, Su-Jun,Lee, Juno,Yoo, Kwang-Eui 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.2

This study deals with transfer passengers in hub airports. The research objective is to derive measures for transfer passenger quantity enhancement at Incheon International Airport by applying Analytic Hierarchy Process. In pursuing the above objective, this study conducted a survey to evaluate various selection criteria for choosing transfer airports and ranked attributes in weight order with Analytic Hierarchy Process. Furthermore, based on the trend analysis of Incheon International Airport's transfer passenger movement, this paper analysed main transit routes of Incheon International Airports against competitor airports among the region. The main result found from the study is flight frequency, ticket price and connecting hour were the most important 3 factors when people choose transit airports. Therefore, it is recommended government, airport authority and airlines to cooperate closely to meet the transfer passengers' needs on frequency, price and transit hour of flights.

복수공항시스템 분석을 통한 제주신공항 운영방안 연구

전제형,박정민,이준오,송병흠,Jeon, Je-hyung,Park, Jeongmin,Oh, LeeJun,Song, Byung-Heum 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.3

In order for the international aviation community to efficiently and safely manage the gradual increase of air passenger demand, direction suggestions of airport traffic prediction based on future airport capacity requirements, airport design and infrastructure establishment is utilized by airport traffic data that is m comparable internationally. It is a global trend to pursue more efficient airport operating system structure to accept air passenger demand through more realistic comparable data in order to escape from the structure of reckless airport establishment and infrastructure composition based on passenger demand predictions referring to simple statistical data that has existed in the past. This study aimed to seek effective operational measures for the New Jeju airport scheduled to be opened in 2025 by time-series analysis. This study also analysed airport operation strategies, air traffic distribution strategies, cargo volume increase rates and its effectiveness of airports adopting the multi-airport system that have similar operational practices and geographical conditions. This study sought the most appropriate multi airport system application measures for New Jeju airport to promote efficiency and international competitiveness.

HFOQA 이벤트 분석과 SMS를 통한 국내 회전익항공기 체크리스트 개발

전제형,송제환,장성규,송병흠,Jeon, Je-Hyung,Song, Je-Hwan,Jang, Sung-Kyu,Song, Byung-Heum 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.4

According to various researches, one of main causes of flight accidents is influence of human factors. It is important to collect and analyze event data in advance to minimize and prevent human errors by developing safety checklist. As a result international aviation industry developed Flight Operations Quality Assurance for commercial airliners, and, upon its proven effectiveness, it is now highly recommended to adopt for helicopter operations. Consequently, S government organization instituted Helicopter Flight Operations Quality Assurance system in 2012. Hence, this study conducted regression analysis of S organization's flight event frequency and applied ICAO SMS Matrix to categorize the severity of the events according to international standards. Based on the analysis, this research derived fundamental checklist factors for helicopter, which can be a proactive measure for safe operation.

자동화 기법을 적용한 선체 저항 및 자항 해석

전제형,김태훈,권재웅,정영준 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5

본 연구에서는 KCS 선형에 대한 저항 및 자항, 프로펠러 단독 성능 해석의 결과를 시험과 비교하여 CFD 접근의 유용성을 검증하고자 하였다. 씨디어댑코 코리아 에서 제공하는 STAR-CCM+를 사용하여 해석을 진행 하였으며 수행된 해석 기법의 검증을 거쳐 매크로 자동화를 통해 업무의 효율성과 사용자 편의를 향상시키고 사용자의 실수에 의한 데이터 오류를 줄이고자 하였다. 저항해석을 수행함에 있어 Heave와 Pitch 운동을 고려함으로써 자세변화로 인한 선체 저항 및 유동장의 변화를 알아 보았으며, 자항해석을 수행하기 위해 Sliding Mesh를 적용하여 자항점 유추에 있어서의 유효한 결과를 도출하였다.

Radical을 이용한 디젤 엔진의 NOx 제거 특성 ( NOx Removal characteristics Using Radical In A Diesel Engine )

전제형,최승환,전충환,장명준,이광학 대한기계학회 2000 대한기계학회 춘추학술대회 Vol.- No.-

항공안전도 향상을 위한 불안정 접근 방지대책

전제형,송제환,정창재,임세훈,송병흠,Jeon, Je-hyung,Song, Jehwan,Jung, Chang-jae,Lim, se-hoon,Song, Byung-Heum 한국항공운항학회 2018 한국항공운항학회지 Vol.26 No.3

Aviation industry is growing rapidly, and this growth is expected to continue. However, aircraft accident rate is still high, and 65 percent of accidents occur during landing phase due to unstable approach. Therefore, this research analyzed causes and countermeasures of unstable approach. In order to derive countermeasures, this study selected P International Airport as an example case. In addition, this research analyzed A airline's FOQA data, regional Standard Operating Procedures, and 5 years of environmental factors to identified correlation of those contributing factors. In conclusion, his research concluded following results. First of all, because of P International Airport's geological features, pilots are required to conduct Circling Approach, and this advanced maneuver increases workload at the final stage of flight. Secondarily, meteorological factors such as crosswind, seasonal rain front, local visibility contributes unstable approach. Lastly, these geological and meteorological factors are interrelated, and this uncommon environment can decrease circumstantial judgement ability of pilots and jeopardize aviation safety. As a consequence, it is recommended to reinforce the Crew Resource Management and Threat & Error Management systems so that pilots can perceive identical safety target.

ID 디젤엔진의 연소 해석과 Radical을 이용한 NOx 제거 특성

전제형(Je-hyeong Jeon),김현규(Hyun-kyu Kim),전충환(Chung-hwan Jeon),장영준(Young-jun Jang) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

It is reported that we are facing the serious environment pollution difficulties such as acid rain, green house effects, etc. The gaseous matter CO, NOx, SOx, VOCs which are regarded as main factors for these current pollutions are mainly emitted from power plants and vehicles. Therefore several leading countries are regulating the related laws strictly, especially exhaust emissions from a Diesel engine without an aftertreatrnent device. The Objective of this study is to analyze the combustion judging from net heat release rate by acquiring each cylinder pressures and to find out NOx removal characteristics focused on emissions of an 101 Diesel engine utilizing radical at each engine speed and load. In addition, the optimum temperature condition to activate reaction by radical is experimentally carried out. Concentration of exhaust emissions is analyzed from the gas anlayzer(KaneMay) and FTIR to estimate by-products.