• 대한교통학회지
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• 제20권4호
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• pp.83-93
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• 2002

조사비용이 비교적 소요되더라도 추정해의 정확도를 높이기 위해 링크교통량과 target OD 외에 추가정보를 확보하여 OD추정을 하는 연구들이 시도되고 있다. 그러나 추가정보를 이용한 기존 OD추정기법은 대부분 추가정보의 특성 또는 장점을 유지하는 목적함수 구성 및 분석을 수행하지 못하여, 확보된 정보를 효율적으로 이용하지 못하는 문제를 가지고 있다. 본 연구의 목적은 관측교통량과 target OD외에 비용효율적인 추가정보를 이용하여 가능해의 범위를 좁힘으로써 추정OD의 정확도를 증진하는 것으로, 이를 위해 표본링크이용비(sample link use proportion)를 추가정보로 이용하였다. 즉 OD통행량과 링크교통량과의 관계를 target OD의 통행배분에서 구하지 않고, 도로변 면접조사에서 확보가능하며 신뢰성 높은 정보인 표본링크이용비를 이용하여 구하였다. 이에 따라 본 연구에서는 경로기반 비균형 통행배분개념 하에서 링크교통량 보존법칙을 고려할 필요가 없는 OD추정 해도출 알고리즘을 제시하였다. 시험네트워크에 대한 사례분석결과, 표본링크이용비는 추가정보의 정확도가 낮은 경우에도 효율적으로 OD 추정력을 향상시킬 수 있었다. 그리고 표본링크이용비를 이용한 OD 추정기법은 target OD 오차나 관측교통량 오차에 크게 영향을 받지 않아, 링크교통량이나 OD 행렬이 변화된 곳에서도 비교적 안정적인 OD 추정이 가능하였다. 또한 표본링크이용비를 추가정보로 이용할 경우에 이용정보간의 정밀도문제가 발생하기 때문에 다른 이용정보의 정밀도 수준을 고려하여 추가정보의 조사수준을 설정하여야 하며, 관측교통량을 기본정보로 하는 추정기법은 링크교통량을 일정수준까지는 관측하여야 추가정보의 자료활용성을 높일 수 있다는 점을 제시하였다. 마지막으로 링크상의 추가정보는 최적조사위치문제를 고려하여야 하며, 특히 정보의 정밀도 측면에서 볼 때 링크교통량의 최적관측위치문제보다 표본링크이용비의 최적조사위치문제가 추정력 향상에 더 중요한 영향을 미칠 수 있는 것으로 파악되었다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 추계학술대회
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• pp.133-143
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• 2004

컨테이너터미널에서의 시설물배치의 중요한 목표는 단위물류영역별로 각각이 서로 효율적으로 배치되어 전체적인 이동시간의 최소화와 역주행방지, 기존공간의 최적활용, 작업자의 편익과 컨테이너 취급비용의 최소화로 컨테이너 처리가 원활히 이루어지도록 컨테이너터미널시설물의 합리적인 배치가 기본이 돼야 한다. 따라서, 합리적인 배치를 위해서 기존 컨테이너터미널 종사자 및 전문가들이 가지고 있는 현장에서의 경험적인 지식을 이용한 접근방법과 물류흐름의 동선 및 체계의 계량적분석이 가능한 수학적인 체계적 분석방법을 결부 시켜 컨테이너터미널의 시설물배치가 이루어져야 한다. 따라서 본 연구에서는 경험적인 지식과 수학적인 분석 방법이 결합된 시설물배치의 체계적접근방법을 이용한 연구흐름도를 작성하고, 분석절차에 따른 시설물배치과정을 수행했다.

• 한국조리학회지
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• 제23권6호
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• pp.27-35
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• 2017

The purpose of this study was to examine the causal relationship among restaurant selection attributes and customer satisfaction and recommendation tastes for young people in their twenties who use tickets for Rail-ro. Data collection was conducted to utilize questionnaire survey with online and offline distribution. The collected data were analyzed using a statistical program SPSS 21.0 with frequency analysis, reliability analysis, factor analysis, and regression analysis. The results of the study showed that Internet search is the most common source of information about restaurants during the trip, and restaurant choice attributes have an important impact on customer satisfaction, food quality, employee service and reputation, but hygiene did not have a big effect on customer satisfaction. In addition, customer satisfaction has a significant effect on recommendation intention. Concluding the results from this study, it investigated the significant attributes for customers selection of restaurants and provide meaningful advice for market managers to make useful marketing strategies to attract more clients and augment economic benefits.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.280-281
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• 2011

Special Protection Scheme(SPS) that operates scenarios about faults beyond the normally protective action is wide system protection technology for the purpose of wide areas protection. Therefore, the SPS focuses on the improvement of the power supply capability by protecting the system rather than protecting the system equipments. Since the SPS requires emergency operation, the operation schedule is set up in advance by analyzing various scenarios. Since the SPS's action scheme uses generator tripping and is a classical method it is presently the most powerful one. However, as the setting of SPS is set to the most severe disturbance, the scheme tends to trip more generators than required to prevent fault propagation. It is highly likely that tripping generator units to prevent fault propagation would result in difficulty of system management and possibility of load shedding. Accordingly, it is desirable that generators are connected to the system within the range that ensures system stability and intelligent SPS is currently under development to solve the problem being stated. In this paper, as a part of developing the intelligent SPS, application of the fast-valving and braking resistor scheme to the generators is being proposed and analysed to reduce the number of tripped generators.

• Ocean and Polar Research
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• 제38권3호
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• pp.235-245
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• 2016

The purpose of this study is to estimate the Willingness To Payment (WTP) of sea-anglers regarding the increase in the abundance of fish resources resulting from the Korean vessel buy-back program using the contingent valuation method. Data was collected through sample surveys of 352 sea-anglers across the nation in 2015. If a 20% increase in the abundance of fish resources resulted from the vessel buy-back program, WTP estimates of sea-anglers per recreational fishing trip were 9,570 won on truncated mean, 16,528 won on mean, and 35,830 won on median, respectively. Additionally, when the number of annual total recreational fishing trips in Korea were estimated as 22,700 thousand trips, the annual increase in national welfare through recreational fishing was estimated to be 217.2 billion won on the truncated mean, 375.2 billion won on the mean, and 813.3 billion won on the median, respectively.

• 유통과학연구
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• 제18권6호
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• pp.25-35
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• 2020

Purpose:Travel agencies have use digital tools in order to shift the paradigm in how business is conducted. Online travel agencies provide the same services as a normal travel agency, including hotels, transportation, guided tours, reservations, and related services, but using an "online platform. Travelers planning a trip can use a lot of forms to collect information and have access to a larger amount of information, so the factors that influence the user's behavioral intention are very important. This research has the conducted to find what factors lead to the attitudes of consumers in using OTA using the UTAUT model. Research design, data and methodology: The object of this study were respondents of a google survey using convenient sample extraction method, chosen among consumers who gathered information, or purchased a product. A total of 217 of the 235 questionnaires Google survey answered were used in the final analysis, excluding insincere responses. Using PSS v.21 and AMOS v.21, frequency analysis, feasibility and reliability analysis, path analysis was performed. Results: UTAUT affects OTA use satisfaction and trust, and OTA satisfaction and trust affect behavior intention. Conclusions: Research was conducted using the UTAUT model to explore factors that affect the attitudes of users of online travel agencies (OTA).

• Corrosion Science and Technology
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• 제10권1호
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• pp.1-5
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• 2011

The major purpose of the present study is to evaluate the performance of various galvanized (GI) or galvannealed (GA) mild steels and AHSS in stamping applications. Finite Element Analysis (FEA) of selected stamping operations was conducted to estimate the critical pressure boundary conditions that exist in practice. Using this information, laboratory tribotests, e.g. Twist Compression (TCT), Deep Drawing (DDT) and Strip Drawing (SDT) Tests, were developed to evaluate the performance of selected lubricants and die materials/coatings in forming galvanized steels of interest. The sheet materials investigated included mild steels and AHSS (e.g. DP600 GI/GA, DP780 GI/GA, TRIP780 GA and DP980 GI/GA). Experimental results showed that galvanized material resulted in more galling, while galvannealed material showed more powdering and flaking. The surface roughness and chemical composition of galvanized sheet materials affected the severity of galling under the same testing conditions, i.e. lubricants and die materials/coatings. The results of this study helped to determine the critical interface pressure that initiates lubricant failure and galling in stamping selected galvanized sheet materials. Thus, to prevent or postpone the critical interface conditions, the results of this study can be used to select the optimum combination of galvanized sheet, die material, die coating and lubricant for forming structural automotive components.

• 한국정보시스템학회지:정보시스템연구
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• 제27권3호
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• pp.203-225
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• 2018

Purpose This study investigated the impact of review language style (affective vs. cognitive) on review helpfulness and the moderating effects of the types of attractions in the relationships between the review language and its helpfulness. Design/methodology/approach This study investigates the impact of review language style (affective vs. cognitive) on review helpfulness and the moderating effects of the types of attractions in the relationships between the review language and its helpfulness. This study selected two hedonic and utilitarian attractions (Hedonic: Brandenburg Gate, Utilitarian: Peragamon Museum) located in Berlin. A total of 3,320 reviews was collected from TripAdvisor. We divided online reviews posted for these places into reviews with more affective language and with more cognitive language by using the LIWC. Then, we investigated the impact of language effect on review helpfulness across the attraction type. Findings The findings suggest that peers tend to judge more helpful toward cognitive language in attraction reviews regardless of attraction type. This study found that peers tend to perceive more helpful toward cognitive review in utilitarian attractions. Even though there was an interaction effect between review language and attraction type, in hedonic attractions, the influence of cognitive language was reduced, but still cognitive reviews would get more helpful votes.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제28권3호
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• pp.423-429
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• 2014

초행길 인생인 우리들이 시행착오를 줄이려면, 인류가 이룩한 인생살이의 교훈과 노하우를 미리미리 교육을 통해 깨닫는 것이 필요하다. 교육현장에서 미시적 탐구 위주의 수학교육 연구영역을 삶에 관계되는 영역까지 확장하여, 인생살이를 효율적으로 통찰하고자 한다. 본 연구는 인생살이를 살피는 방법들을 크게 네 가지로 분류하고, 인생살이 통찰에 필요한 수학적 모델을 경험 가능한 일상영역에서 찾을 수 있도록 설계하였다. 이렇게 만들어진 모델세계로 인생살이를 통찰하는 예를 통해, 수학적 모델링으로 인생살이를 통찰하는 방법을 새롭게 소개한다.

• 가정과삶의질연구
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• 제20권4호
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• pp.53-60
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• 2002

The purpose of this study was to comprehend the cognition of Korean tradition and the required basic educational contents among interior architects. The survey had been made 277 designers and the major findings of this study are as follows. First. It is revealed that only a half of interior architect have been taught about Korean tradition in university and their level of knowledge is entry level. Therefore it is found that the education in university on the Korean tradition was not sufficient enough Second, it is believed that one ideal way of expressing Korean tradition is re-interpreting traditional motive with modern views and another way is to express abstractly about Korean traditional space arrangement, composition and space concept. It is found that substantial knowledge and information is required to express Korean tradition effectively. Third. it is found that a lot of interior architect has faced difficulties in carrying out projects because of not having sufficient knowledge related to Korean tradition. Therefore it is recommended to educate basic theory about Korean tradition first and then reinforce the program by including field trip In university curriculum. Fourth. it is necessary to re-educate to current Interior architect because of lacking knowledge about Korean tradition. The recommended area in priority order is traditional Interior space, traditional architecture, traditional color, traditional pattern and traditional furniture