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홍성태,김제우,김형순,Hong Seong Tae,Kim Je-U,Kim Hyeong-Sun 대한음성학회 1998 말소리 Vol.35 No.-
Database segmented and labeled up to phoneme level plays an important role in phonetic research and speech engineering. However, it usually requires manual segmentation and labeling, which is time-consuming and may also lead to inconsistent consequences. Automatic segmentation and labeling can be introduced to solve these problems. In this paper, we investigate a method to improve the performance of automatic segmentation and labeling system, where Spectral Variation Function(SVF), modification of silence model, and use of energy variations in postprocessing stage are considered. In this paper, SVF is applied in three ways: (1) addition to feature parameters, (2) postprocessing of phoneme boundaries, (3) restricting the Viterbi path so that the resulting phoneme boundaries may be located in frames around SVF peaks. In the postprocessing stage, positions with greatest energy variation during transitional period between silence and other phonemes were used to modify boundaries. In order to evaluate the performance of the system, we used 452 phonetically balanced word(PBW) database for training phoneme models and phonetically balanced sentence(PBS) database for testing. According to our experiments, 83.1% (6.2% improved) and 95.8% (0.9% improved) of phoneme boundaries were within 20ms and 40ms of the manually segmented boundaries, respectively.
홍성태,배영호,권순결,이현우,서기영 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.9
This study describes a software-based conrol methodology eliminating low-frequency harmonics from a 3.phi. phase-controlled converter. The converter topology used in the study is capable of the phase current lagging and dealying with respect to the phase voltage. Low order harmonics are eliminated in the dc output voltage by introducing notches. The good agreements between the simulation and experimental resuls show the validity of the proposed scheme. The use of the software-based control scheme results in a simple and flexible realization of the system.
복수공항시스템 현황과 발전 전략 - 동아시아 MAS 분석을 통한 전략 개발을 중심으로 -
홍성태,이용국 한국항공경영학회 2019 한국항공경영학회지 Vol.17 No.3
Multi-airport systems(MAS) have been prevailing to meet global customers’ needs for air transportation. The salience of MARs is driven by many factors such as the increase of customer needs, globalisation, intense competition, regional and political consideration, technology development, the growth of Low Cost Carrier and so on, which make customers’ choice more complex and unpredictable. The purpose of this paper is to identify the growth and current situation of MAS and develop the sustainable strategy of MAS fitting to new turbulent environments. Literature review and some quantitative analysis using secondary data of ITRS are conducted. Results show that airports in East-asia have made every effort to attract much more passengers and increase labor productivity. Differentiative strategies with the decrease of the dominant airline are highly recommended to increase labor productivity by attracting more flights and passengers, which airports in this region might finally gain the competitive edge. Customer-centric approach rather than provider oriented should be taken to meet needs of customers in this intense competition market. Innovative and differentiating strategy should be designed, developed and implemented to gain competitive edge. Positioning strategy with POP and POD and the differentiable airport servicescape providing memorable experiences to passengers should be formulated. The airport is recognized no longer as physical and locational site where passengers and freight exchange between air mode and land transport modes, but the aggregation of all cultures, designs and technologies to provide passengers wonderful experiences. Integrative and harmonizing strategies in MAS are highly recommended to gain a sustainable advantage in MAS ecosystem. 복수공항시스템은 항공운송에 대한 고객 욕구를 충족시키고자 두드러진 현상으로 나타나고 있다. 이는 고객욕구, 글로벌화, 경쟁촉진, 지역과 정치적 고려, 기술발전, LCC 증가 등과 같은 여러 요인에의해 유발되고 있으며, 이는 소비자들의 선택을 복잡하고 예측하기 어렵게 만들고 있다. 본 연구의 목적은 복수공항시스템의 성장과 현황을 파악하고 새로운 격변하는 환경에 적합한 발전전략을 도출하는 것이다. 이를 위해 문헌 연구와 ITRS에서 발표된 이차자료를 가지고 계량적 분석을수행하였다. 분석 결과, 이 지역의 공항들은 대형 기종 투입을 증가하고 노동생산성을 증대하고자 지속적 투자를 전개하고 있다. 노동생산성 증가를 위해서는 주된 항공사의 비중을 낮추는 전략과 항공편당 탑승객수를 증가시키는 차별화된 노력이 필요함을 확인할 수 있다. 항공시장과 같이 극심한 경쟁시장 환경에서는 우선적으로 공급자 지향 사고보다는 고객 중심적 사고가 우선되어야 한다. 공항내지는 MAS(Multi-airport system)의 지속적 경쟁 우위 확보를 위해서는 혁신적이고 차별화된 전략 설계, 개발 및 실행이 우선되어야 한다. Points-of-Parity와 함께 Points-of-Difference 를 가진 포지셔닝 전략과 차별적 서비스케이프와 문화를 가진 공항 분위기를 통해서 고객에게 잊을수 없는 경험을 제공해줄 수 있어야 한다. 공항은 이제 더 이상 사람이나 사물이 교환되는 물리적 장소가 아니라 고객에게 기억할만한 경험을 제공하는 모든 문화, 설계, 기술 및 시스템의 총체로서 발전시켜야 할 것이다. 복수공항시스템의 지속적 경쟁력 강화를 위해서는 복수공항시스템 생태계에서 구성원과 이해관계자간의 통합적이고 조화로운 전략 모색이 시급히 요구된다.