• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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• pp.227-230
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• 2002

In this paper, we designed and made an image processing board that converts analog NTSC CVBS from CCD camera into digital image, stores it in a memory and accomplishes an appropriate digital image processing suitable to our application. And then loaded it on the self-controlled mobile vehicle and verified its performance by controlling the self-controlled mobile vehicle to avoid obstacles and arrive at the destination through various digital image processes. From the result, the self-controled mobile vehicle system avoided obstacles and got the destination correctly. We knew that designed image processing board is enough to realize the real-time control system.

• 드라이브 ㆍ 컨트롤
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• 제9권2호
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• pp.8-14
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• 2012

Electro-hydraulic spring return actuator(ESRA) is utilized for air conditioning facilities in a nuclear power plant. It features self-contained, hydraulic power that is integrally coupled to a single acting hydraulic cylinder and provides efficient and precise linear control of valves as well as return of the actuator to the de-energized position upon loss of power. In this paper, the algebraic equations of ESRA at steady-state have been developed for the analysis of static characteristics that includes control pressure and valve displacement of pressure reducing valve, flow force on flapper as well as its displacement over the entire operating range. Also, the effect of external load on piston deviation is investigated in terms of linear system analysis. The results of static characteristics show the unique feature of force balance mechanism and can be applied to the stable self-controlled mechanical system design of ESAR.

• 한국세라믹학회지
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• 제46권5호
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• pp.472-477
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• 2009

Monodisperse spherical $SiO_2$ particles of various sizes ($\sim$350 nm and $\sim$800 nm) and size distributions were synthesized from TEOS and MTMS. The particle size and size distribution were controlled by changing the volume ratio of water to ethanol and the reaction temperature. Narrow-sized $SiO_2$ particles with $\sim$3% size distribution were obtained. Self-assembly of the $SiO_2$ particles for photonic crystals were performed by the solvent evaporation method. The number of ordered $SiO_2$ layers can be controlled by changing the amount of the dispersed $SiO_2$ volume fraction in the solvent.

• 한국콘텐츠학회논문지
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• 제19권2호
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• pp.450-459
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• 2019

본 연구는 뉴미디어 환경에서 소비자들의 설득적 메시지 소비 행태를 연구하기 위해 '자기 효능감(self-efficacy)'이라는 개념을 광고적 관점에서 어떻게 적용할 것인가에 대한 이론적 검토를 논의하고자 한다. 소비자가 컨트롤하는 미디어 환경, 소비자들의 다양한 광고 태도 및 대응전략 등을 검토하고, '자기 효능감' 개념이 정치, 교육 및 인터넷 분야에서 어떻게 정의되고 적용되는지 살펴보고자 한다. 또한, 광고적 관점에서 '자기 효능감'이 소비자 광고 태도에 어떻게 적용될 것인가를 논의하고자 한다. 마지막으로, '광고 자기 효능감'이라는 개념이 광고 연구 및 광고 산업에 끼치게 될 영향도 살펴보고자 한다. '광고 자기 효능감'이라는 새로운 개념에 대한 활발한 토의를 위해 이론적 정의에 대한 다양한 의견이 수렴되어야 할 것이며, 또한 조작적 정의를 위해 타당성 검증을 위한 척도 개발에 대한 연구도 향후 이루어지길 바란다.

• 동력기계공학회지
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• 제9권1호
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• pp.14-22
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• 2005

This work deals with a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. The fuel is injected indirectly into electrically heated inlet air flow. In order to keep a homogeneous air-fuel mixing, the fuel injector is water-cooled by a specially designed coolant passage. Investigated are the engine performance and emission characteristics under the wide range of operating conditions such as 40 in the air-fuel ratio, 1000 to 1800 rpm in the engine speed, $150\;to\;180^{\circ}C$ in the inlet-air temperature, and $80^{\circ}$ BTDC to $20^{\circ}$ ATDC in the injection timing. A controlled auto-ignition gasoline engine can be achieved that the ultra lean-burn with self-ignition of gasoline fuel by heating inlet air. It can be achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxide had been significantly reduced by CAI combustion compared with conventional spark ignition engine.

• Transactions on Electrical and Electronic Materials
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• 제3권3호
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• pp.8-13
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• 2002

Controlled precipitation of quasi-binary semiconductor system is newly proposed as an effective and reliable technique for the formation of well-defined and crystallographically aligned semiconductor nanostructures. Using HgTe-PbTe quasi-binary semiconductor system, self-aligned HgTe nanocrystallites distributed three dimensionally within PbTe matrix were successfully formed by the simple three step heat treatment process routinely found in age hardening process of metallic alloys. Examination of the resulting nano precipitates using conventional transmission electron microscopy (CTEM) and high resolution TEM (HRTEM) reveals that the coherent HgTe precipitates form as thin discs along the (100) habit planes making a crystallographic relation of {100}$\_$HgTe///{100}$\_$PbTe/ and [100]$\_$HgTe///[100]$\_$PbTe/. It is also found that the precipitate undergoes a gradual thickening and a faceting under isothermal aging up to 500 hours without any noticeable coarsening. These results, combined with the extreme dimension of the precipitates (4-5 nm in length and sub-nanometer in thickness) and the simplicity of the formation process, leads to the conclusion that controlled precipitation is an effective method for preparing desirable quantum-dot nanostructures.

• 동력기계공학회지
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• 제10권1호
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• pp.19-24
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• 2006

This work treats a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. The fuel was injected indirectly into electrically heated inlet air flow. In order to keep a homogeneous air-fuel mixing, the fuel injector was water-cooled by a specially designed coolant passage. The engine performance and emission characteristics were investigated under the wide range of operating conditions such as 40 in the air-fuel ratio, 1000 to 1800 rpm in the engine speed, 150 to $180^{\circ}C$ in the inlet-air temperature, and $60^{\circ}$ BTDC in the injection timing. The ultra lean-burn with self-ignition of gasoline fuel by heating inlet air was achieved in a controlled auto-ignition gasoline engine. It could be also achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxide significantly reduced by CAI combustion compared with conventional spark ignition engines.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제30권2호
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• pp.169-190
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• 2023

In this paper, we introduce an extension of rectangular metric spaces called controlled rectangular metric spaces, by changing the rectangular inequality in the definition of a metric space. We also establish some fixed point theorems for self-mappings defined on such spaces. Our main results extends and improves many results existing in the literature. Moreover, an illustrative example is presented to support the obtained results.

• International Journal of Advanced Culture Technology
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• 제7권4호
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• pp.187-193
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• 2019

In this study, we attempted to identify the personality traits that influence one's likelihood to stalk an ex-partner on Facebook. Specifically, we focused on self-concept-related traits, given that the motivations for using social network sites (SNS) are highly associated with the concept of self. These include self-esteem, narcissism, and self-efficacy. To assess these factors, we controlled for extraneous variables while assessing the predictive power of personality traits, such as Facebook usage, length of the relationship, and time since the break-up. The results of a self-administered, web-based survey (N=207) showed that self-esteem, narcissism, and self-efficacy are all traits that can predict the stalking of an ex-partner on Facebook. More specifically, we showed a negative association between self-esteem and one's likelihood to stalk an ex-partner on Facebook, while it showed positive relationships between Facebook stalking and both narcissism and self-efficacy.

• 대한치과교정학회지
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• 제47권1호
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• pp.11-20
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• 2017

Objective: This randomized controlled trial aimed to compare the stability of mandibular arch orthodontic treatment outcomes between passive self-ligating and conventional systems during 6 months of retention. Methods: Forty-seven orthodontic patients with mild to moderate crowding malocclusions not requiring extraction were recruited based on inclusion criteria. Patients (mean age $21.58{\pm}2.94years$) were randomized into two groups to receive either passive self-ligating ($Damon^{(R)}$ 3MX, n = 23) or conventional system (Gemini MBT, n = 24) orthodontic treatment. Direct measurements of the final sample comprising 20 study models per group were performed using a digital caliper at the debonding stage, and 1 month, 3 months, and 6 months after debonding. Paired t-test, independent t-test, and non-parametric test were used for statistical analysis. Results: A significant increase (p < 0.01) in incisor irregularity was observed in both self-ligating and conventional system groups. A significant reduction (p < 0.01) in second interpremolar width was observed in both groups. Mandibular arch length decreased significantly (p = 0.001) in the conventional system group but not in the self-ligating system group. A similar pattern of stability was observed for intercanine width, first interpremolar width, intermolar width, and arch depth throughout the 6-month retention period after debonding. Comparison of incisor irregularity and arch dimension changes between self-ligating system and conventional system groups during the 6 months were non-significant. Conclusions: The stability of treatment outcomes for mild to moderate crowding malocclusions was similar between the self-ligating system and conventional system during the first 6 months of retention.