• 산업공학
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• 제18권3호
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• pp.333-342
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• 2005

In this paper, we propose an efficient forecasting methodology of the mid and long-term frequency demand in Korea. The methodology consists of the following three steps: classification of basic service group, calculation of effective traffic, and frequency forecasting. Based on the previous studies, we classify the services into wide area mobile, short range radio, fixed wireless access and digital video broadcasting in the step of the classification of basic service group. For the calculation of effective traffic, we use the measures of erlang and bps. The step of the calculation of effective traffic classifies the user and basic application, and evaluates the effective traffic. Finally, in the step of frequency forecasting, different methodology will be proposed for each service group and its applications are presented.

• 대한임베디드공학회논문지
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• 제5권1호
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• pp.7-17
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• 2010

ITS(Intelligent Transport System) as things are used for Broadcast service using TDMB/TPEG/NAVI rather than personal seamless service. It is attaching weight to Traffic information gathering, Charging, Settlement service. This research is applied to improve DCCP(Datagram Congestion Control Protocol) which has function as protecting data and preserving message boundary. The improving method is like that we solve data trust in UDP because Connection and Transmission overhead in UDP is less than in TCP. We fix the data loss which is generated from unordered delivery section of IP base wireless service by using DCCP protocol. We guarantee of connection with OBE(On-Board Equipment) and reliance about transmission of data by complement to mapping table and multi-hoping. Finally, We evaluate the performance about transmission of IP based data. We constructed a test-bed near research center for this test.

• 한국통신학회논문지
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• 제22권5호
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• pp.1007-1017
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• 1997

본 연구에서는 생존 트래픽의 비율로 정의되는 생존도가 아닌 트래픽의 중요도에 따라 통신재난의 영향을 평가할 수 있는 척도로서 새로운 통신만 생존도 평가모형을 제시한다. 제시하는 생존도 평가척도에 근거하여 장애발생시 우회경로를 발견하고 복구 트래픽을 할당하는 최적화 모형을 수립한다. 최적화 모형은 신호복구수준과 트래픽 분할에 따라 구분되면 이들은 모두 정확한 해를 구하기 어려운 혼합정수계획문제로 표현된다. 따라서 모형별로 휴리스틱 해법을 제시하고 노드 10개, 링크 17개의 망에 적용하여 결과를 비교한다.

• 한국컴퓨터정보학회논문지
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• 제6권4호
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• pp.131-137
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• 2001

본 논문은 ATM망에서 ATM계층의 셀 전달 트래픽에 대해 실시간으로 측정하고 측정을 통해 수집된 데이터를 토대로 트래픽 특성을 분석하기 위한 도구 설계에 관한 것으로 설계된 도구를 현장에 적용, real-ATM트래픽을 측정하고 분석하여 도구의 효율성을 확인하였는데, 분석 결과 망 자원의 효율을 약 20％～50％ 까지 개선시킬 수 있을 것으로 확인되었으며 분석 파라메터는 현장에 적용하였고, 적용된 파라메터는 품질을 보장하면서 망 자원 효율을 높일 수 있는 것으로 확인되었다. 따라서, 가입자별 트래픽 유형을 일별 주별, 월별, 분기별로 분석할 수 있도록 향후 많은 raw data를 기반으로 데이터베이스 구축이 필요하며 이를 토대로 망 확장 및 신규 망 구축을 위한 설계 분야 및 ATM망의 트래픽 수요 예측에 활용될 수 있을 것이다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.1049-1052
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• 1999

As the Internet traffic increases, the demand for higher performance routers continues to grow, and it makes switch chips more complex. To make matters worse, these chips also need to handle high-level services. In this paper, we introduce an efficient verification methodology that can support real network traffics to satisfy the verification requirement of real complex situation even at the early design phase of switch chips.

• 기술사
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• 제40권6호
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• pp.53-58
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• 2007

The government announced to launch tours to the Mt.Baekdu that use a direct air route through the 2007 South-North Korean leader joint declaration. The Mt.Baekdu tourism is large symbolism to the Korean people. Government and Hyundai Asan speak that propel Mt.Baekdu tourism using existent Samjiyeon airport in early time. But, air traffic and airport operation must consider safety preferentially. Present condition investigation and facility improvement of the Samjlyeon airport should be enforced first. And need facility expansion by increased demand hereafter. Compose South-North Air traffic network system to this opportunity and basis research and phase investment may have to be propelled.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.7-10
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• 1998

In implementing real time video on demand(VOD), the increase of user on internet causes a network traffic congestion. In this paper, we programmed a CGI able to login in VOD home for limiting the number of user in solving the problem, and also applied and adaptive multimedia synchronization technique for controlling video and audio data in a network. In addition, a real time multimedia player was designed and implemented in a personal computer operating at Window95/98/NT.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.884-888
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• 2005

The interests of the government and civil business owner against the Light rail transit are increasing, it may be caused by the enterprise conception which does not consider a city circumstance that the construction plan is insensitively performed. This article present the forecast method of minimum transportation demand which secures a profitability. If It is in advance investigated the number of passenger using the existing traffic system of the area, it will be possible that the LRT project is planned on a realistic basis.

• 한국콘텐츠학회논문지
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• 제10권12호
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• pp.254-266
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• 2010

본 연구는 천안시를 대상으로 도시교통문제를 다루었다. 본 연구는 문헌조사와 실증조사를 병행하였다. 회수된 설문지 394부를 SPSS 15.0버전으로 빈도분석을 실시하였다. 천안시의 도시교통문제는 출 퇴근시의 교통체증 현상, 대중교통의 불편, 주차문제, 자동차로 인한 대기오염, 교통사고로 인한 불안 등을 들 수 있다. 교통문제의 개선방안으로는, 첫째, 합리적 교통수요의 관리에 따른 교통체계의 개선방안이 마련되어야 한다. 둘째, 천안시는 대중교통의 이용대상인 대학생이 많으므로 대학생을 대상으로 할인을 적용 대중교통 이용률을 높여야 한다. 셋째, 대중교통중심체제의 강화 및 개선을 통한 교통체증의 해결이 필요하다. 넷째, 도로 등 교통시설의 공급확대, 가로망체계 정비 및 신호운영체계의 개선을 적극적으로 추진해 나가야 한다. 특히 천안에는 오래된 도로의 정비가 필요하고 도로망이 복잡하게 얽혀있는데 이를 간단하게 개선함으로써 보다 접근성이 좋아질 것이다. 다섯째, 주차문제의 해결과 이용자들의 교통질서 의식함양 등 선진 교통문화의 정착이 필요하다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.2309-2318
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• 2010

It is a plan the government increases a railroad section SOC investment, and to activate railroad construction while a railroad wins the spotlight with green transportation. But an error of the demand forecast that is a base of a railroad investment evaluation follows in occurring big, there is it with an operation with an obstacle of a railroad investment. Case of the Incheon International Airport Railroad which went into operation recently, While a present transportation demand showed about 10% than a demand forecasted in a past conference, it was magnified in a social problem. A lot of research was gone on in road project about traffic demand forecast and error, a study to find out the error cause is an insufficient situation although errors of a railroad occurs big. So, this study looked for errors and causes about trip generation model and modes sharing model of railroad demand forecast but it was defined causes so that it can occur similar problems in the future. Especially it investigated causes after comparing rate of development plan for the realization and O/D size in trip generation model and after comparing rate of modes sharing of past and current and conducting a survey for airport users. In conclusion, it suggested method to reduce errors of railroad demand forecasting in the future.