• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.161-166
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• 2001

The static characteristics of four-nozzle flapper valves are investigated with both constant flow and constant supply pressure. The ranges, in which linearization of these characteristics would be valid, are discussed. Linearized dynamic model is also derived. Numerical simulations of nonlinear dynamic model are carried out by HyPneu to make an assessment of the effect of input step size in both cases of no-load and blocked-load operation.

• Information and Communications Magazine
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• v.27 no.12
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• pp.24-30
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• 2010

본 고에서는 스마트폰, 스마트TV를 비롯한 통신서비스의 컨버전스 양상과 여타 과학기술과 IT의 융합현상으로 인한 새로운 산업의 등장 등, 가속적인 ICT의 진화로 말미암아 점차로 불거지고 있는 망 중립성에 대한 논의와 관련하여, 진화하고 있는 ICT 환경에서 그 동안 정보통신서비스의 혁신적 발전을 견인해왔던 기존의 망 중립성에 대한 개념에 대한 새로운 시각들을 살펴보고, 향후 소비자들의 망 접근성을 보장할 수 있고, 정보통신서비스는 물론 산업 전반이 지속적으로 성장하기 위한 망 사용에 대한 새로운 원칙의 수립에 대한 고려사항에 대해 알아본다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.94-96
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• 2021

울산광역시 인근 연근해 해저도시 실증사업 후보지들에 대한 후보시설물의 입지선정 및 설계요건을 확인하고 이들 시설물의 개발, 제작, 시공, 운영, 철거 과정을 포함하는 생애 전주기를 대상으로 하는 기후중립성 설계요건을 제시하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.619-620
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• 2023

본 논문에서는 탄소중립 중요성이 증대됨에 따라 일상 배출되는 생활 쓰레기 중 자원으로 재활용 할 수 있는 다양한 요소를 탄소중립실천요소로서 정의하고 각 행위를 자동적으로 분류하고자 한다. 딥러닝과 영상처리의 한 분야인 객체 인식 기술을 활용하여, 실시간으로 탄소중립실천요소를 인식하고 재활용 자원의 결과를 수집, 관리할 수 있는 모바일 앱 개발한다. 아울러, 플라스틱컵, 유리컵, 텀블러, 종이컵, 빨대 등 실제 재활용 자원의 이미지에 적용하여 인식을 수행하고 그 결과를 분석한다.

• Korean Journal of Cognitive Science
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• v.21 no.2
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• pp.387-408
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• 2010

This study examined the effects of emotional content on the encoding process of emotional stimuli and the effects of emotional context on those of neutral stimuli. It was examined whether the superior memory of emotional stimuli is due to attentional resource allocation. This study were performed an emotional picture and a neutral word were presented in succession at every trials. The results of recognition judgement showed superior memory of emotional pictures than neutral pictures, but showed poorer memory of neutral words in emotional context than those in neutral context. LPC(Late Positive Complex) of ERP results showed the similar pattern: higher amplitude by emotional pictures than neutral pictures, and lower amplitude by neutral words in emotional context than those in neutral context. This result is considered to support attention allocation hypothesis.

• The Journal of Korean Academy of Prosthodontics
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• v.54 no.4
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• pp.407-412
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• 2016

The neutral zone technique is an alternative approach for the construction of complete dentures on highly atrophic ridges with history of denture instability. This technique achieves two objectives. First, the teeth will not interfere with the normal muscle function, and second, the force exerted by the musculature against the denture is more favorable for stability and retention. In this case of a 78-years-old female patient with severely atrophic ridges who had been using unstable complete dentures, the neutral zone impression technique was used to increase the stability and the retention of dentures. The neutral zone for both arch was located with modeling compound. After the arrangement of artificial teeth within the neutral zone, the external impression was taken to determine the tissue surface. The final dentures showed enhanced stability and retention and the patient was satisfied with the new dentures with respect to functional and esthetic aspects.

• Communications of the Korean Mathematical Society
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• v.20 no.3
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• pp.411-426
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• 2005

본 논문에서는 상미분방정식, 지연미분방정식, 중립형 지연미분방정식, 그리고 차분방정식 의 안정성에 관한 연구방법과 최근의 연구동향들을 간략하게 소개하였다.

• Journal of Bio-Environment Control
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• v.12 no.2
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• pp.77-82
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• 2003

The effect of the particle size of perlite and irrigation amount on the growth, root activity and mineral competition of tomato was investigated in a recycling system. The particle sizes used were small (SPP, øl∼2 mm), medium (MPP, ø2∼3 mm), (LPP. ø4∼5 mm). Plant height, fresh weight and dry weight of tomato at the earlier growth stage were good at 3.0 L/day in MPP and LPP, but these were not significantly affected by irrigation amount in MPP, Fruit number, weight and yield increased at 1.5 L/day in SPP and 3.0 L/day at MPP or LPP, Deformed fruits tended to increase at higher irrigation amounts regardless of particle size. Root activity increased with increasing particle size with higher irrigation amount during early stage after transplanting, but remarkably decreased at 3.0 L/day in SPP as compared with the others at 100 days. Mineral contents of plants after harvest were higher at MPP and LPP than SPP, but were highest at 3.0 L/day in LPP. In conclusion, it was regarded that tomato growth in a recycling system was optimal at MPP or LPP with irrigation amount of B.0 L/day.

• Journal of Bio-Environment Control
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• v.12 no.2
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• pp.83-88
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• 2003

The effect of vertical stratification of perlite by particle size on the growth and yield of tomato In a recycling hydroponics was examined. Vertical stratifications were composed of mixed form of small medium and large size (MP), divided forms of small and large size (smal1/1arge, DP I), and medium and large size (medium/large, DP II). Tomatoes showed higher growth in divided form, specially in DP II than DP I. Deformed fruits had higher occurrence by 17.8% in the mixed form than divided forms, while they were not significantly different between mixed forms. Root activity tended to increase during 20 days to 50 days after transplanting (DAT) in all treatments, but showed highest value at 50 DAT in DP II. After harvest electric conductivity and pH of stratified perlite were slightly higher in upper zone of DP I, but were not different in the other treatments. Mineral contents in the medium after harvest were higher in lower zone than the upper zone in MP and DP II, but vice versa in DP I.

• The Journal of Korean Academy of Prosthodontics
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• v.61 no.1
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• pp.18-25
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• 2023

We present the case of a 65-year-old man with maxillary and mandibular complete dentures prepared using neutral zone technique after undergoing mandibulotomy due to tonsil cancer 10 years ago. The patient had a short edentulous period; hence, there was minimal absorption of the alveolar ridge and no abnormality in the motor function of the tongue. However, the retromolar pad was located inside the hamular notch, and the posterior alveolar ridge was relatively turned inward. If the artificial teeth would have been aligned conventionally, the functional space of the tongue would have been invaded, which would have moved the tongue posteriorly thereby reducing the stability of the denture. Therefore, applying the concept of the neutral zone can be a good reference point in such cases. The neutral zone was registered using tissue conditioner, and tooth alignment was performed by making a silicone putty index. The biggest advantage of using neutral zone concept is denture stability. In this case, the neutral zone technique was applied to obtain the lingual alignment limit of the posterior teeth to avoid invasion of the tongue space by the left posterior part of the mandible. Particularly, in case of a patient in which denture stability is difficult to obtain due to absorption of the alveolar ridge, it is believed that better results can be obtained using neutral zone technique.