• 한국자동차공학회논문집
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• 제20권3호
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• pp.58-66
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• 2012

This paper describes a design and a verification of linear state observers for a motorized seat belt system to estimate state information such as angular velocity and load torque. The motorized seat belt system provides functions to protect passengers and improve passenger's convenience. To realize these functions, sensors which can measure an angular velocity and load torque are needed. By use of the linear state observer, state information can be estimated without sensors. The motorized seat belt system is analysed and represented as a state space model which contains load torque as an augmented state. By the developed state space model, a full and reduced order observer are designed and verified by experiments. The full and reduced order observer are also compared from points of view of execution time and noise robustness.

• 한국화재소방학회논문지
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• 제18권4호
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• pp.103-109
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• 2004

지하공간에서의 재난은 많은 인명피해를 가져오고 있어서 지하공간에 대한 위험성평가는 인명피해를 최소화할 수 있는 방안으로 우선되어야 한다. 특히 지하철 역사에서의 피난동선과 연기의 이동경로가 동일하여 발생되는 피해를 최소화하기 위한 수직개구부상의 제연경계벽 설치연구는 필수적이며, 화재시뮬레이션을 통한 평가를 통하여 그 효용성을 분석한 결과 연기제어와 피난여유시간을 확보하고 기존 역사에 설치된 제연설비와의 연계된 작동시 많은 효과가 있을 것으로 확인되었다. 이를 통하여 일부 수도권 지하철 역사에는 수직개구부에 제연경계벽을 설치하였고, 계속적으로 위험성평가를 통한 분석을 진행하고 있다.

• 항공우주정책ㆍ법학회지
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• 제22권2호
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• pp.135-154
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• 2007

The 3 Northeast Asian countries of Korea, Japan and China have been stricter to each other than to other countries of out-region in air liberalization. The prominent reason of this intra-regional protective policy in air transportation seems to be the difference in competitive strength of their national flag carriers. As the 3 countries realize the importance of their mutual cooperation in the region, since China grows to be one of the leading economies in the world and the intra-regional trade and visitors increase tremendously, they are now taking the policy of intra-regional air liberalization more vigorously than before. Especially air cargo liberalization is easier than air passenger liberalization because they realize that the development of open economy is based on free flow of logistics regardless of the competitiveness of their national flag carriers. As Korea is the leading country in the region to promote air liberalization, this paper reviews the importance and growing trend of air cargo, analyzes current air liberalization policy between Korea, Japan and China and the initial effects of open sky in the routes of Shandung-Korea, and suggests the new policies of air liberalization to promote free flow of air logistics.

• 한국실내디자인학회논문집
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• 제39호
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• pp.116-123
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• 2003

The purpose of this study is to demonstrate the relationship between the results of the analysis of the overseas railroad station buildings, which was conducted using the factors of environmental cognition for the purpose of designing an interior environment for the Incheon International Airport Railroad station that will be newly constructed, and the plan that could be applied to the design of interior environment for the airport railroad station. The station with a complex interior space layout and relatively larger space tends to be difficult to predict or forecast passenger's needs or recognition element in approaching stage of intoner environment design since the human's biological memory system is greatly affected by such factors. Cognitive approach at empirical standpoint would possibly create the design, of which elements will Implement the functions of their own as such approach enables necessary information to be structured in a systematical way and manner In implementing interior environment design for such stations to be built for the first time in Korea, behavioral approach based on systematic theory proved to be very crucial. Under such a background, the study was aimed at extracting the assessment elements for interior environment design, then setting the frame of cognitive approach to eventually propose the guideline in approaching to interior environment design.

• 한국자동차공학회논문집
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• 제11권4호
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• pp.68-78
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• 2003

Recently, low speed vehicle (LSV) is beginning to appear for various usages. The body of the LSV is usually made of the aluminum space frame (ASF) type rather than the monocoque or unitary construction type. A pa.1 of the reason is that it is easier to reduce mass efficiently while the required stiffness and strength are maintained. A design flow for LSV is proposed. Design specifications for structural performances of LSV do not exist yet. Therefore, they are defined through a comparative study with general passenger automobiles. An optimization problem is formulated by the defined specifications. At first, one pillar which has an important role in structural performances is selected and the reinforcements of the pillar are determined from topology optimization to maximize the stiffness. At second, the thicknesses of cross sections are determined to minimize the mass of the body while design specifications are satisfied. The optimum solution is compared with an existing design. The optimization process has been performed using a commercial optimization software system, GENESIS 7.0.

• 한국항공우주학회지
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• 제35권4호
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• pp.308-315
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• 2007

연구는 경비행기인 창공-91의 인증 획득을 위한 비행시험의 일부로서 상승성능을 파악하기 위하여 수행되었다. 창공-91은 1993년에 대한민국의 건설교통부로부터 최초로 인증을 취득한 단발엔진을 장착한 일반유형의 5인승 항공기이다. 상승을 위한 비행시험 절차 및 자료는 형식증명을 획득하는데 사용되었다. 톱니형 상승 데이터로부터 양항곡선방법으로 데이터를 처리하여 창공-91의 최대상승률, 최대상승각 속도, 최대상승률 속도, 그리고 절대상승한도를 구하였다. 또한, 상승성능의 결과로부터 양항곡선식을 구함으로써 형상항력계수와 오스왈드 효율계수를 비행기 설계시의 값과 비교하였다.

• 한국항공운항학회지
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• 제31권2호
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• pp.55-65
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• 2023

Due to extreme urbanization, ground transportation in the city center is saturated, and problems such as the lack of expansion infrastructure and traffic congestion increase social costs. To solve this problem, a 3D mobility platform, Urban Air Mobility (UAM), has emerged as a new alternative. A vertiport is a physical space that conducts a similar role to an airport terminal. Vertiport consists of take-off and landing facilities (TLOF, Touchdown and Lift-Off area), space for boarding and disembarking from UAM aircraft (gates), taxiways, and passenger terminals. The type of vertiport (structure, number of facilities) and concept of operations are key variables that determine the number of UAM aircraft that can be accommodated per hour. In this study, a capacity calculation method was presented using an optimization technique (Deterministic Integer Linear Programming). The absolute capacity of the vertiport was calculated using an optimization technique, and a sensitivity analysis was also performed.

• 한국산학기술학회논문지
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• 제13권11호
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• pp.5525-5533
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• 2012

최근의 건축물은 초고층화 또는 지하 공간의 심층화되어감에 따라 과도한 수직 거리 이동으로 인하여 체력이 부족한 사람들이 피난층 비상구에 이르기 전에 지쳐서 쓰러질 가능성이 있다. 화재 발생 인접 구역으로부터의 초기 피난에는 계단을 사용한 후에 나머지 거리는 승강기를 이용하여 안전한 공지나 도로로 탈출하는 방법을 요구하고 있다. 이에 따라 서울특별시 초고층 건축물 가이드 라인에서 피난용승강기에 대해 제정되었다. 최근 층수는 지하 7층 지상53층, 바닥면적 $6,800m^2$ 연면적 $127,050m^2$, 용도는 문화 및 집회시설 판매시설 업무시설 숙박시설(호텔) 공동주택(아파트)의 건축물을 설계하면서 피난용승강기를 별도로 설치하기에는 효율적이지 못하다는 판단하에 승용승강기의 설치기준에 따라 설계된 승강기를 피난용으로 사용하기로 결정하였다. 그러나 이에 대한 세부 설계지침내용이 아직까지 마련되어 있지 않아 국내법과 해외 설치기준을 근거로 승용승강기를 피난용으로 이용하기 위한 설계방법을 정리하였으며, 실제 설계된 도면으로 ELVAC+와 PathFinder의 피난프로그램으로 승강기수와 승강기를 이용한 피난자수의 적정성에 대해 연구하였다.

• 한국소음진동공학회논문집
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• 제26권2호
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• pp.195-202
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• 2016

In this study, a concept of active sound enrichment (ASE) control system was implemented and demonstrated for improving engine sound quality inside the cabin of a passenger car during acceleration. Unlike the active noise control cancels the noise for disturbance rejection, the ASE adds additional sound to the noise for tracking control. This approach requires a new algorithm to provide additional artificial sound to the original engine sound using active control strategy to achieve a target sound profile, which is predefined to satisfy required interior sound quality. The ASE algorithm was implemented in a digital controller dSPACE DS1401 and real-time control experiment was accomplished in an actual car. The ASE control results show that the actively enriched sound of each engine order against RPM tracks the target profiles precisely and quickly and improves the discontinuity, the level ratios and the sound pressure level of each engine order. Thus it is anticipated the ASE system can be applied for the improvement of the engine sound quality inside the cabin during acceleration.

• 한국항해항만학회지
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• 제44권1호
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• pp.1-9
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• 2020

본 연구는 국내 연안여객선 중 로팍스(Ro-Pax)여객선을 대상으로 거주구 실내디자인의 문제점을 파악하고 개선방안을 제시하는데 목적이 있다. 먼저 기존 연구 및 문헌 조사를 통하여 거주구 특성에 대해 고찰한 후 현재 운항하고 있는 로팍스여객선 7척에 대하여 현장 조사를 실시하였다. 현장조사를 통해 나타난 문제점을 바탕으로 여객선 전문가 38명을 대상 설문조사를 실시하였으며 그 결과 거주구 실내디자인에서 공용시설이 가장 불만족한 것으로 나타났다. 실내디자인 만족도에 미치는 영향을 검증하기 위해 다중회귀분석 결과 색채 만족도가 거주구 사용자 만족도에 가장 높은 영향을 미치는 것으로 나타났으며 거주구 실내디자인지침의 필요성이 높게 나타났다. 연구결과 공용시설의 종류 및 배치, 색채디자인 개선, 거주구 실내디자인지침 마련 등을 실내디자인 개선방안으로 제시하였다.