• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.4
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• pp.407-416
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• 1988

Thick film city gas sensors were fabricated using \ulcornerFe2O3 and \ulcorner-Fe2O3 as raw materials. Their electrical properties and sensitivity characteristics were investigated and the surface conditions for various firing temperatures were analyzed. The fabricated devices exhibited high sensitivity to butane gas(75~80% n 1, 000ppm butane ambient). Also they showed good selectivity and long-term stability. A city gas alarm system using fabricated sensors was made for the practical application.

• Journal of the Korean Institute of Gas
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• v.11 no.2 s.35
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• pp.43-54
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• 2007

Despite the importance of customer satisfaction corresponding to the phenomenal development of the gas industries, supplier-centered management still prevails in the city gas industry due to the monopolistic market environment. However, customer's demands for diverse and higher services are ever growing in the midst of the development and the accelerated competition of the service industries. In this context, customer satisfaction management may be the best style of management for establishing a short, mid and long-term foundation of growth. This paper derives directions for improving customer satisfaction management in such 3 areas as systematic, technological and service improvement from the environmental changes as well as from the customer needs. Based on the survey and comparative analysis of customer satisfaction, we also suggest 5 growth strategies to maintain sustainable development of the gas industry in the midst of competitive environment between city gas companies and among diversified energy businesses and to protect rights of the city gas consumers.

• The Korean Journal of Applied Statistics
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• v.22 no.5
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• pp.1019-1032
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• 2009

The city gas demand data has strong seasonality. Thus, the seasonality factor is the majority for the development of forecasting model for city gas supply amounts. Also, real city gas demand amounts can be affected by other factors; weekday effect, holiday effect, the number of validity day, and the number of consumptions. We examined the degree of effective power of these factors for the city gas demand and proposed a time-series model for efficient forecasting of city gas supply. We utilize the liner regression model with autoregressive regression errors and we have excellent forecasting results using real data.

• Environmental and Resource Economics Review
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• v.9 no.5
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• pp.829-851
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• 2000

This study used the contingent valuation method to determine how much consumers would be willing to pay to improve their city-gas safety and what factors influence consumers' willingness-to-pay (WTP). To elicit this information a mail questionnaire was sent to a randomly selected sample of 2,400 residents who use the city-gas. The survey results showed that individuals were willing to pay $4,750{\pm}342.8$ won per month for the city-gas safety improvement. The aggregate annual WTP was estimated at 121.5~318.0 billion won. To better understand how individual's socio/demographic characteristics affect the WTP, Censored Tobit analysis was used. The results show that higher income, more gas use (cooking and heating), willingness to install a safety instrument significantly increase consumer's WTP.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.7 no.1
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• pp.65-71
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• 2011

Recently, central and local governments of Korea have established and implemented various energy policies such as making energy map of city level and establishment of environment friendly city plan to materialize low carbon green city. To implement effectively these policies, however, conditions of energy consumption by each administrative district and each usage have to be verified exactly. This study is aimed to suggest a basic data for planing energy policy and energy demand prediction of city level by analyzing energy consumption unit and conditions of city gas by borough and usage in Busan.

• Journal of Korean Institute of Industrial Engineers
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• v.39 no.4
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• pp.247-252
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• 2013

Korea gas corporation (KOGAS) is responsible for the whole sale of natural gas in the domestic market. It is important to forecast the daily demand of city gas for supply and demand control, and delivery management. Since there is the autoregressive characteristic in the daily gas demand, we introduce a modified autoregressive model as the first step. The daily gas demand also has a close connection with the outdoor temperature. Accordingly, our second proposed model is a temperature-based model. Those two models, however, do not meet the requirement for forecasting performances. To produce acceptable forecasting performances, we develop a weighted average model which compounds the autoregressive model and the temperature model. To examine our proposed methods, the forecasting results are provided. We confirm that our method can forecast the daily city gas demand accurately with reasonable performances.

• Journal of the Korean Institute of Gas
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• v.20 no.6
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• pp.102-114
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• 2016

Due to the Paris Agreement, city gas is drawing attention as an alternative energy source to reduce greenhouse gases. This study conducts a comparative analysis on the economic effects of city gas between Korea and Japan, using input-output(I-O) tables from the Bank of Korea and from Japan's Ministry of Economy, Trade and Industry. The results show that production-inducing, value-added-inducing and employment-inducing effects of Korea's city gas were greater than those in Japan. But supply-shortage and price-pervasive effects of Korea's city gas were also greater than those in Japan. According to these results, production-inducing, value-added-inducing and employment-inducing effects should be sustained, and the policies vitalizing stabilizing supply-shortage and price-change effects, on the other hand, are recommended.

• 한국가스학회:학술대회논문집
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• 2004.11a
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• pp.201-206
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• 2004

• 한국가스학회:학술대회논문집
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• no.5
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• pp.63-68
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• 2002

• Journal of Advanced Marine Engineering and Technology
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• v.18 no.4
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• pp.84-93
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• 1994

The purpose of this study is to modify the kerosene furnace, which is forced flue type with 15000kcal capacity, to gas furnace satisfying for CITY gas, LNG gas and LPG gas. The gas furnace, a kind of gas appliance, is mainly used for heating houses by combusion of gas. This paper describes briefly the design technology for gas burner which is most important in replacing kerosene fuel with gas fuel. Especially, the design for gas nozzle is constructed by theoretical and experimental method. It is found that the experimental results of the modified gas burner are good agreement with the theoretical results for calorific value and combustion efficiency. The result of this study will contribute in the design skill and of gas burner and similar gas appliance, and the pursuit for reduction of fuel cost as well as atmospheric pollution.