• 대한교통학회지
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• 제26권2호
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• pp.69-78
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• 2008

관광교통은 한정된 시기에 집중적으로 발생되는 특성을 가지고 있으므로 도로확장 및 신설과 같은 하드웨어적인 측면보다는 관광교통 특성을 고려한 새로운 교통시스템 도입 등과 같은 소프트웨어적인 측면의 접근이 필요하다. 따라서 최소의 비용으로 최대의 효과를 얻을 수 있는 관광 교통정책의 방향을 수립하는 것이 무엇보다 중요하다고 볼 수 있다. 이에 본 연구에서는 일반교통과 관광교통에서의 교통정체에 대한 인지특성을 파악하고 환승 교통시스템 도입에 따른 환승 교통수단 선택행동모형을 구축하고 영향 요인을 파악하였다. 그 결과, 응답자들이 평상시 느끼는 교통정체보다 관광지 교통정체의 인지강도를 크게 느끼는 것으로 나타나 관광지 접근성 향상 정책의 도입의 필요성이 있는 것으로 나타났다. 마지막으로 환승 교통수단 선택행동 모형을통해 환승 교통시스템 도입이 관광시즌 집중되는 승용차 교통량을 대중교통으로 전환시킬 수 있음을 간접적으로 확인할 수 있어 관광지 활성화를 위한 관광정책 수립시 교통 측면을 고려한 종합적인 정책 수립이 무엇보다 중요함을 확인할 수 있었다.

• 전자공학회논문지C
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• 제35C권5호
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• pp.17-24
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• 1998

In this paper, we suggested and verified the effective traffic information transfer methods using the GPS (Global positioning system) and voice broadcasting. We suggested four traffic information selection methods with their testing algorithms. A traffic information transfer simulation system is developed for testing the recommended methods. In the result, we compared and analyzed efficiency of suggested methods.

• 대한교통학회지
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• 제25권4호
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• pp.57-66
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• 2007

급속한 경제성장과 직장 근무형태의 변화로 관광 레크레이션(Recreation) 활동이 가중되면서 관광지에서 다양한 교통문제가 유발되고 있는 실정이다. 특히, 관광교통은 일반 교통과 달리 지역내 교통이 아닌 외부에서 접근하는 교통으로 관광지 주변 교통상황을 파악하기 힘들고 한정된 관광시즌에 집중됨으로써 문제 해결의 실마리를 찾기 어렵다는 한계점을 가지고 있다. 이에 본 연구에서는 관광시즌 관광지의 교통정체를 해소하기 위한 환승 교통시스템 도입의 타당성을 파악하기 위하여 평상시와 관광시의 교통정체에 대한 인지특성을 파악하고 환승 교통시스템 도입에 따른 지불의지액 추정 모형을 구축하였다. 그 결과, 셔틀버스 요금에 대한 지불의지금액은 1,430원, 환승 주차요금은 1,651원으로 추정되어 현재 버스 요금보다 약간 높게 나타났으며, 환승 교통시스템 도입이 관광지 접근도로의 교통정체 해소 및 관광자원 개발에 도움을 줄 것이라고 생각하고 있는 응답자들의 지불의지가 높게 나타나고 있음을 알 수 있어 환승 교통시스템 도입이 타당함을 간접적으로 확인할 수 있었다.

• 한국항만학회지
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• 제2권1호
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• pp.29-73
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• 1988

Since the middle of 1950's when sea transportation service by container ship was established, containerization has been rapidly spread over the world with realization of intermodalism, and becomes an index of economy growth of a country. Our country has established Pusan Container Terminal at Pusan harbour in 1978 in step with worldwide trend of containerization, and is constructing New Container Terminal at Pusan outharbour which will be completed in 1990. This paper aims to make a quantitative analysis of the Pusan Container Terminal system through the computer simulation, especially focusing on its subsystems such as ship stevedoring system, storage system and transfer system. First, the capacity of various subsystems are evaluated and it is checked whether the current operation is being performed effectively through the computer simulation. Secondly, the suggestion is presented to improve the operation by considering the throughput that Pusan Container Terminal will have to accept until 1990, when New Container Terminal will be completed. The results are as follows ; 1) As the inefficiency is due to the imbalance between various subsystems at Pusan Container Terminal on the basis of about 1.2 million TEU of container traffic, transfer equipment level must be up to 33% for transfer crane, and free period must be reduced into 4/5 days for export/import. 2) On the basis of about 1.4 million TEU of container traffic, transfer equipment level must be up to $12\%$ for gantry crane, $11\%$ for straddle carrier and $66\%$ for transfer crane, and free period must be reduced into 3/4 days for export/import. 3) On the basis of about 1.7 million TEU of container traffic, transfer equipment level must be up to $25\%$ for gantry crane, $28\%$ for straddle carrier and $100\%$ for transfer crane, and free period must be reduced into 3/4 days for export/import. 4) On the basis of about 2 million TEU of container traffic, transfer equipment level must be up to $25\%$ for gantry crane, $30\%$ for straddle carrier and $110\%$ for transfer crane, and free period must be reduced into 2/3 days for export/import, and it is necessary to enlarge storage yard.

• 한국통신학회논문지
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• 제21권2호
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• pp.394-408
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• 1996

In this paper, we classify the transfer method of overflowed traffic from microcell to macrocell in micor/macro overlaid PCS system using CDMA technology, and analyze the traffic characteristics of traffic transfer methods. Soft-handoff is charaterized by communications with a new bastation on the same CDMA frequency assignment before terminating communications with the old basestation. Therefore, soft-handoff is superior to hard-handoff with respect to Grade Of Service, but it decreases the carried traffic of system. Therefore, we analyze the effect of soft-handoff with respect to handoff area variation. In order to analyze soft-handoff effect, we resolve the probability of dewelling time in soft-handoff area, and calculates the carried traffic of microcell using this result.

• 한국응급구조학회지
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• 제4권1호
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• pp.63-71
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• 2000

Exceptive clause of ambulance stated in Road Traffic Laws of ambulance car accidents is not properly applied and emergency staffs who transfer over 85% of emergency cases are to be forced to start out to the emergency field with unstable conditions which they may be punished on the criminal and civil laws. Hereby this study makes the following suggestions to activate the duties of transferring emergency cases by emergency staffs, promote their morale and diminish the victim of emergency staffs due to traffic accidents. 1) It is prescribed that ambulance car drivers should be protected legally by applying the exceptive clauses thoroughly regulated in special case clauses because ambulance cars are used for the purpose of saving the human life. 2) On the traffic accidents occurred during the transfer of emergency cases, the special insurance system is created for treating the ambulance car accidents, not to bind the emergency staff's mistake to traffic law and the victims are compensated by the nation on the basis of insurance system and emergency staffs have the systematic security. 3) On the road over six lanes, emergency lane is set on the center and ambulance car should be used as the exclusive lane. 4) Ambulance car drivers must have the habit of transferring emergency cases rapidly within the range of legal operation.

• 전자공학회논문지S
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• 제34S권11호
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• pp.25-33
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• 1997

The end-to-end rate-based control mechanism is used for the flow control of the ABR service to allow much more flexibility in ATM switching system. To accommodate the ABR service effciently many algorithms such as EFCI, EPRCA, ERICA, and CAPC2 have been proposed for the switch algorithm. ABR cells and related RM cells are received at the ATM switch fabric transparently without any processing. And then cells received from the traffic source are queued in the ABR buffer of switching system. The ABR buffer usually has some thresholds for easy congestion control signal transmission. Whatever we use, therefore, these can be many ABR traffic control algorithms to implement the ABR transfer capability. The genertion of congestion indicate signal for ABR control algorithms is determined by ABR buffer satus. And ABR buffer status is determined by ABR cells transfer ratio in ATM switch fabrics. In this paper, we presented the functional structures for control of the ABR traffic capability, proposed the readout scheduling, cell slot allocation of output link and the buffer allocation model for effective ABR traffic guranteeing with considering CBR/VBR traffics in ATM switch. Since the proposed readout scheduling scheme can provide more avaliable space to ABR buffer than existing readout scheduling scheme, generation rate of a SEND signal, that is, BCN signal in destination node can be increased for ABR call connection. Therefore, the proposed scheme, in this paper, can be appropriate as algorithm for effective ABR traffic service on output link of ATM switching node.

• 한국정보처리학회논문지
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• 제6권11호
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• pp.3116-3123
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• 1999

Current disk systems are generally designed to reduce read traffic more effectively. Hence, write traffic of the I/O workload could potentially become a bottleneck of the disk system performance. In order to overcome this problem without much cost, this paper presents using outermost-zone track of multi-zoned recording disk as a secondary disk cache. The proposed disk cache improves the disk system performance by following exploitations: speed difference between block transfer and track transfer, difference in transfer rate between outermost-zone tracks and inner tracks, reduction in the seek time caused by decreasing the number of disk cache tracks, and idle period during burst accesses. In addition, it does not waste the disk space because it allocates the caching space by the cylinder unit. The simulation results show that the proposed system improves 2.54∼3.11 times better in terms of average response time for write operations than existing disk systems..

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2956-2958
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• 2000

This paper describes the design of a real time traffic data acquisition system using loop detector and piezzo sensor. Loop detector is the cheapest method to measure the speed and piezzo is used to detect the vehicle axle information. A ISA slot based I/O board is designed for data acquisition and PC process the raw traffic data and transfer the data to the host system. Simulation kit is designed with toy car kits. simulated loop detector and piezzo sensor. The data acquisition system collects up to 10 lane highway traffic data such as vehicle count. speed. length axle count. distance between the axles. The data is processed to generate traffic count, vehicle classification, which are to be used for ITS. The system architecture and simulation data is included and the system will be tested for field operation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2499-2502
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• 2005

Universal Serial Bus (USB) is one of the most popular communication interfaces. When USB is used in more extended range, especially configuring home network by connecting multiple digital devices each other, USB interface uses the bandwidth in the way of Time Division Multiplexing (TDM) so that the bottleneck of bus bandwidth can be brought under the heavy traffic. In this paper, the more effective usage of bus bandwidth to overcome this situation is introduced. Basically, in order to realize the system for transferring real-time moving picture data among digital information devices, we analyze USB transfer types and descriptors and introduce the method to enhance the detailed performance of isochronous transfer that is one of USB transfer types.