• Journal of Korean Society of Transportation
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• v.1 no.1
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• pp.10-27
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• 1983

In order to improve the traffic enviroments in the urban streets of Seoul, the computer controlled traffic signal system was installed on 45 intersections at 1980. Afterward, yearly expansion was done to the numbers of 132 intersections and 232 loop detectors. The problems of timing plans were discussed, mainly pedestrian crossing timing as well as the generations of split and offset. The broad urban streets more than 30m require long phasing time of pedestrians, even though the equivalent or correspondent traffic volume is rare. The configuration of computer system for traffic control was disscussed in terms of control strategy. An overview also given. The improvements were measured at every quater. The travel speed improved to 42%, delay time reduced to 41% and number of stops to 43% respectively.

• Proceedings of the IEEK Conference
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• 2000.11b
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• pp.196-199
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• 2000

In this paper has studied an enhanced usage parameter control algorithm, which is one of the preventive traffic control method in ATM networks. The proposed algorithm is based on the CLP(Cell Loss Priority) bit in the ATM cell header. This algorithm can eliminate the measurement phasing problem in cell conformance testing in ATM networks. The proposed algorithm can minimize the cell loss ratio of high priority cell(CLP = 0) and resolve the burstiness of eel]s which may be generated in the multiplexing and demultiplexing procedure. For the performance evaluation, we have simulated the proposed algorithm with discrete time input traffic model and the results show that the performance of the proposed algorithm is better than that of ITU-T usage parameter control algorithm.

• International Commerce and Information Review
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• v.7 no.4
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• pp.245-268
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• 2005

The purpose of this paper is to acquire competitiveness faced with a global business so that Korea and China make them put ICT into practice through industrial policy of regional innovation clustering. In the Chapter 2, overall review of industrial spaces theory and the environment in Global-business is conducted. In the Chapter 3, current main economic issue and West Great Development of China are viewed. Chapter 4 proposes models and strategies for the target of regional innovation clustering and phasing in development. The results of this study is that both country should do more long-term cooperation and collecting intensive knowledge for the property of region and preparatory research of regional innovation clustering than do reckless investment.

• Journal of Korean Society for Atmospheric Environment
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• v.19 no.2
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• pp.113-132
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• 2003

In May 2001, the Stockholm Convention on Persistent Organic Pollutants (POPs) for phasing out and eliminating POPs was signed by 90 countries at the Diplomatic Meeting in Stockholm. In 1998, three years before the Convention, the protocols on POPs and heavy metals were adopted by the United Nations Economic Commission for Europe under the Convention on Long-Range Transboundary Air Pollution. Growing attention on POPs and heavy metals during the past 10 years is primarily due to their toxicity in minute quantities. POPs and some metal compounds are even more toxic because of their bioaccumulation potentials associated with a high lipid solubility. Furthermore, owing to their persistence and semi - volatility, they are widely distributed in the environment, traveling great distances on wind and water currents. Recent international cooperation to address POPs and heavy metals has focused on these issues. Long -range transport of those pollutants are particularly concerned since Korea is located downwind of prevailing westerlies from China. In this paper, a review is provided to assess the properties, sources, emissions, and atmospheric concentrations on POPs and heavy metals.

• Journal of Korean Society for Atmospheric Environment
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• v.9 no.E
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• pp.364-372
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• 1993

The purpose of this study is to analyze traffic patterns by use of TRANSYT-7F Model, and to choose the optimum traffic-light cycle length and cycle splite to improve traffic flow and air quality at Samsung Intersection in Seoul. Emission rates of air pollutants are calculated for three time segments 0700-0900, 0900-1800 and 1800-2000. The traffic volume correlated reasonably well with air pollutants emitted ; however, the phasing and timing of traffic signals was found to equally be important. The results of performance with optimal setting indicate that the best cycle length were 80sec(0700-0900), 95sec(0900-1800) and 90sec(1800-2000), res-pectively. As expected the highest emissions of air pollutants were observed during the evening rush hours (1800-2000). A properly designed signalized intersection can help reduce traffic delay, driver discomfort, fuel consumption, and air pollution by efficiently the capacity of existing intersection.

• Journal of ILASS-Korea
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• v.23 no.1
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• pp.1-8
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• 2018

In this study, the effects of variation in cam phasing and valve lift of exhaust valves by using Cam-in-Cam system on combustion and emission characteristics for diesel engine were investigated under GT-POWER simulation environment. This paper showed analytic result of combustion characteristics and diesel exhaust valve's control with GT-Power 1-D detail model. As a result, it was found that volumetric efficiency and IMEP were decreased as the exhaust valve opening and closing timing is advanced due to its internal EGR effects. Also, it was found that NOx emission were decreased as EVC timing was retarded. These show that the retarding the exhaust valve closing and opening while keeping the duration at constant can be effective for controlling AFR and mixing rate in diffusion combustion of diesel engine.

• Proceedings of the KOR-KST Conference
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• 2002.02a
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• pp.143-159
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• 2002

The performance of two single-barrier three-phase actuated control systems at diamond interchanges was evaluated for various traffic conditions. To emulate the actuated signal control, hardware-in-the-loop system combined with CORSIM simulation program was used. Two performance measures, average delay and total stops, were used for the evaluation process. Results showed that the two three-phase systems gave similar performance in terms of average delay, but not stops. The delay performance of each phasing system was generally dependent on the traffic pattern and ramp spacing. The total stops decreased as the spacing increased, and it was the most sensitive variable that can differentiate between the two three-phase systems. It was also shown that the hardware-in-the-loop control could provide a good method to overcome the limitations of current simulation technology.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1997.11a
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• pp.564-572
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• 1997

Following the ratification of Vienna Convention for Ozone Layer Protection and Montreal Protocol, Indonesia will implement the phasing-out of to halon at end 1996. Questions are increasing especially from the users where halon has used for many years as the most effective fire extinguishing agent, concerning halon substitutes, alternative systems as well as the handling and utilization of the existing halon. Halon can still be used for critical and essential uses, however, such usage has been gradually eliminated, due to the emergence of halon-like replacement. A concept of halon banking system is proposed to considered, taking into account several aspects such as enforced regulation, institutional involvement technology as well as financing. This paper gives a general overview regarding phase-out implementation, alternative extinguishing systems and concept on halon banking system with special reference to Indonesian case.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.41-44
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• 2015

하플로타입 페이징이란 상동 염색체의 DNA 염기 서열로부터 hetero SNP만을 읽어 들여 프래그먼트들을 만들고 이 프래그먼트들을 조합하여 하플로타입을 결정하는 것을 말한다. 하플로타입 페이징 과정에서 프래그먼트들의 조합은 무수히 많이 존재하며 때문에 하플로타입을 결정하기 위한 효율적인 알고리즘이 필요하다. 본 논문에서는 하플로타입 페이징 알고리즘들의 정확도 비교를 위해 제공되고 있는 데이터들을 가지고 탐욕적 알고리즘을 사용하여 하플로타입 페이징을 했을 경우 얼마나 정답과 유사한 하플로타입을 얻을 수 있는지를 분석하였다. 실험 결과 모든 데이터에 대하여 약 80%의 꽤 높은 정답률을 보였다. 더 나아가, 정답률이 저조한 구간에 대한 원인 분석을 한다.

• Proceedings of the KIEE Conference
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• summer
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• pp.304-306
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• 2004

Recently, operating equipment with the high quality is necessary as technology is developing rapidly and equipment becomes more accurate. Therefore, the importance of diagnosis has been rising in modem industries. This paper presents that the induction motor is driven by invertor. We were using EMTP (Electromagnetic Transient Program) to study different characteristics of induction motor caused by faults; single phasing and the short circuit fault. After having the fault occurred in feeder cable, motor current, flux and torque waveform are analyzed