• 한국도로학회논문집
• /
• 제19권4호
• /
• pp.45-52
• /
• 2017

PURPOSES : This study was initiated to estimate the utilities of usage attributes of BRT and Bimodal Trams using a conjoint analysis method in order to identify the important features pertaining to the use of BRT and Bimodal Trams. METHODS : For this purpose, important attributes and those level in the use of BRT and Bimodal Trams in the city of Sejong were identified. Next, a profile questionnaire pertaining to BRT and Bimodal Trams was designed for the conjoint analysis, and a survey was conducted in the city of Sejong. Using SPSS software, conjoint analysis was performed to identify the important attributes vis-$\acute{a}$-vis the use of BRT and Bimodal Trams in the city of Sejong. Finally, the utilities for individual attributes were calculated based on the models estimated by the conjoint analysis. RESULTS : The results of the conjoint analysis were used to identify the important attributes. With regard to the usage of BRT, users indicated that fare was the most important attribute with the highest utility. In the case of Bimodal Trams, the users indicated that the number of seats and internal environment were the most important attributes with the highest utilities. CONCLUSIONS : Based on the results of the conjoint analysis, the important attributes pertaining to the use of BRT and Bimodal Trams in the city of Sejong were identified. Our study indicates that BRT in the city of Sejong needs to be upgraded to improve the utilities of the important attributes. Currently, Bimodal Trams has not been introduced completely in the city of Sejong. However, in the future, when the introduction of Bimodal Trams is completed, the important attributes should be emphasized in order to improve the quality of its service.

• 한국물환경학회지
• /
• 제36권3호
• /
• pp.185-193
• /
• 2020

Bimodal flocculation describes the aggregation and breakage processes of the flocculi (or primary particles) and the flocs in the water environment. Bimodal flocculation causes bimodal size distribution with the two separate peaks of the flocculi and the flocs. Extracellular polymeric substances and ionic species common in the water environment increase the occurrence of bimodal flocculation and flocculi-floc size distribution, under the flocculation mechanisms of electrostatic attraction and polymeric bridging. This study investigated bimodal flocculation and flocculi-floc size distribution, with respect to the extracellular polymeric substance concentration and ionic strength in the kaolinite-containing suspension. The batch flocculation tests comprising 0.12 g/L of kaolinite showed that the highest flocculation potential occurred at the lowest xanthan gum (as extracellular polymeric substances) concentration, under all the ionic strengths of 0.001, 0.01, and 0.1 M NaCl. Also, it was important to note that the higher ionic strength resulted in the higher flocculation potential, at all the xanthan gum concentrations. The bimodal flocculation and flocculi-floc size distribution became apparent in the experimental conditions, which had low and intermediate flocculation potential. Besides the polymeric bridging flocculation, steric stabilization increased the flocculi mass fraction against the floc mass fraction, thereby developing the bimodal size distribution.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.762-768
• /
• 2010

바이모달트램은 접근성과 정시성의 측면에서 철도와 버스의 이점을 모두 갖춘 신 대중교통 시스템이다. '저탄소 녹색성장'의 국가 전략에 부합하는 바이모달트램은, 앞으로 대중교통으로써 중요한 역할을 담당할 것으로 기대된다. 대중교통은 인구통계학적 특성, 이용자의 행태, 재정상태 등 여러 조건의 영향을 받기 때문에, 본 연구에서는 바이모달트램의 도입여부를 결정하기 위해 고려되어야 할 지표들을 정의하고, 도시별 도입수준을 결정하기 위한 BSI(Bimodal Score for Introduction) 값을 산정하도록 한다. 본 연구는 신 대중교통 시스템으로써 바이모달트램의 도입을 추진하려는 도시의 의사결정에 도움을 줄 것으로 기대된다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.1128-1130
• /
• 2008

Bimodal tram is a new public transportation to improve the existing traffic system. The purpose of this study was to investigate the environmental characteristics of the developed bimodal tram through its life cycle. The used tool was life cycle assessment (LCA), which could evaluate environmental loads quantitatively for a product. Based on bill of material (BOM), the environmental impacts of bimodal tram was calculated from manufacturing to operating phase. Among impact categories, photochemical oxidant creation potential (POCP) was the highest, which was resulted from the manufacturing and the combustion of CNG used as a fuel of bimodal tram. In the future, the application of LCA results can enhance increasingly the environment of bimodal tram as an environmental-friendly transportation.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.1930-1935
• /
• 2008

Bimodal tram is able to run both general and special road. It has also the advantages of both public bus and subway which have the charateristics of easiness to approach and punctuality respectively. These advantages are accomplished by the cooperative communication between the control center and bimodal tram which is running with the fleet. This paper have investigated the requirement analysis and designing of the car operating computer system which have the functions of communication, broadcasting and display. car operating computer system communicates between bimodal tram and control center with wireless antenna. It can also transmit the location and status information of bimodal tram to control center for managing the bimodal tram fleet on road efficiently and economically.

• 한국음향학회지
• /
• 제41권1호
• /
• pp.45-51
• /
• 2022

음질평가는 물리적 음향 자극에 대해 주관적으로 지각되는 음색을 평가한다는 측면에서 심리음향학적 측정과 관련이 있다. 본 논문은 인공와우 사용자의 음질평가를 위한 예비연구로서 바이모달 인공와우 사용자를 대상으로 음질평가를 시행하고 인공와우만 착용했을 때와 바이모달을 착용했을 때의 음질평가 차이를 파악하고자 하였다. 총 13명의 바이모달 인공와우 사용자와 7명의 편측 인공와우 사용자가 연구에 참여하였고 순음 및 어음 청력검사, 보청기 기능이득과 실이삽입이득을 측정하였다. 음질평가에서는 바이올린소리, 남자와 여자 노래소리, 냉장고 소음의 4개 음향자극을 방음실에서 들려주고 6개 음질평가 항목에 대해 0에서 10까지의 척도로 표시하도록 하였다. 검사결과 바이모달 사용자는 편측 인공와우만 착용했을 때보다 바이모달을 착용했을 때 음질평가 5개 항목에서 0.8점 높았고, 바이모달 사용자와 편측 인공와우 사용자 그룹간 비교에서는 두 그룹 사이에 차이를 보이지 않았다. 주관적 측면의 바이모달 혜택 측정을 위해서 좀 더 체계적인 음질평가 도구와 방법에 대한 후속 연구가 필요할 것으로 생각된다.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
• /
• pp.652-655
• /
• 2009

The bimodal porous carbons were synthesized by using imprinting method with templates of SBA-15 particle and silica sphere and applied as supporting materials for the electro-catalyst of polymer electrolyte fuel cell (PEFC). The silica spheres with diameter size of 100 nm and SBA-15 particle having 200 nm -250 nm diameter and 700 nm -900 nm length were synthesized in this work. The bimodal porous carbons (S100) were prepared by using the silica spheres and SBA-15 as templates and mesophase pitch as a carbon source. The PtRu nanoparticle of ca. 1.9 nm were supported on the bimodal porous carbon support and the resulting PtRu/S100 catalysts was tested by the cyclic voltammetry. The use of bimodal porous carbon showed in comparable electro-catalytic activities with commercial catalyst. Though unclear effects of bimodal porosity of supports could be obtained in the scope of this study, morphological advantage in electrical conductivity can be considered on the electro-catalytic activity.

• 한국철도학회논문집
• /
• 제12권1호
• /
• pp.122-128
• /
• 2009

바이모달 수송시스템 연구단에서 개발중인 트램은 자동운전이 가능하고 일반도로와 전용구간을 주행할 수 있는 고무차륜방식의 저상굴절 바이모달 트램으로서, 압축천연가스 엔진과 리튬폴리머 배터리를 사용하는 직렬형 하이 브리드 추진계로 구동된다. 본 논문에서는 바이모달 트램의 직렬형 하이브리드 추진장치의 요구사양을 제시하고 하이브리드 추진제어방식에 관해 설명한다. 하이브리드 차량 시뮬레이션 툴인 ADVISOR를 사용하여 기준 주행사이클과 일본의 10-15 mode에 대한 바이모달 트램의 주행을 모의하고, CNG 하이브리드 추진계에 대한 성능을 분석한다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.784-793
• /
• 2010

바이모달트램은 '저탄소 녹생성장' 이라는 국가 교통정책 패러다임에 따라 향후 대중교통체계에서 중요한 교통수단으로 기대된다. 최근 바이모달트램을 도입하기 위해 여러 지자체에서 검토가 이루어지고 있으나 바이모달트램 서비스 수준에 따른 시설 및 운영요건에 대한 도입 매뉴얼이 없는 것이 현실이다. 본 논문에서는 바이모달트램의 도입수준은 저급, 중급, 고급의 3가지로 구분을 하였으며 시설수준과 운영수준을 기준으로 하여 세부요소별 정의를 하였다. 본 연구는 신교통 수단인 바이모달트램을 도입하려는 지자체에 바이모달트램 도입수준에 따른 시설 및 운영요건을 고려하는데 도움을 줄 것으로 기대된다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.241-248
• /
• 2010

A bimodal low-floor tram can provide the punctuality of trains and the flexibility of bus together to the passengers. Its propulsion system is a series hybrid type using a set of CNG engine generator and Li-polymer battery. This paper presents a development of the measurement equipment for fine-tuning of a series hybrid propulsion system of bimodal low-floor tram. Its configuration schemes are described and certified using the measurement data of bimodal low-floor tram.