• 조명전기설비학회논문지
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• 제16권4호
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• pp.101-107
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• 2002

본 논문은 종래형 전해수 발생장치의 평판전극을 슬릿형 평행평판전극 구조로 함으로써 고효율의 강전해수 발생장치를 제안하였다. 염화나트륨이 용해된 수도수와 일반 수도수를 본 강전해수 발생장치에 인입하였을 때 전해수 생성공간내의 공간전하제한작용을 크게 감소시키면서 또한 이 전해수 생성공간내의 전계분포를 집중시킬 수 있는 슬릿형 평행평판전극을 설정하고, 이러한 슬릿의 형태와 개수증가가 수중 이온분리집속성능에 미치는 영향과 산화성물질 생성에 미치는 영향을 연구 검토하였다. 실험결과 수중 강전해수 발생장치내에 슬릿을 형성함으로써 전해수 발생공간내의 전계를 집중시키고 분리집속된 고농도의 이온들에 의한 공간전하 제한작용을 크게 감소시켜 저전력에서 기존의 전해수 발생장치보다 훨씬 고농도의 강전해수와 산화성물질 용존수를 얻을 수 있었다.

• Journal of Power Electronics
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• 제16권6호
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• pp.2243-2257
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• 2016

This paper presents a two stage three-phase proton exchange membrane fuel cell (PEMFC) generation system. When the system is connected to a three-phase load, it is very sensitive to the characteristics and type of the load. Especially unbalanced three-phase loads, which result in a pulsating power that is twice the output frequency at the inverter output, and cause the dc-link to generate low frequency ripples. This penetrates to the fuel cell side through the front-end dc-dc converter, which makes the fuel cell work in an unsafe condition and degrades its lifespan. In this paper, the generation and propagation mechanism of low frequency ripple is analyzed and its impact on fuel cells is presented based on the PEMFC output characteristics model. Then a novel method to evaluate low frequency current ripple control capability is investigated. Moreover, a control scheme with bandpass filter inserted into the current feed-forward path, and ripple duty ratio compensation based on current mode control with notch filter is also proposed to achieve low frequency ripple suppression and dynamic characteristics improvement during load transients. Finally, different control methods are verified and compared by simulation and experimental results.

• 전기학회논문지
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• 제63권1호
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• pp.18-26
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• 2014

A microgrid can play a significant role for enlargement of renewable energy sources and emission reduction because it is a network of small, distributed electrical power generators operated as a collective unit. In this paper, an application of optimization method to economical operation of a microgrid is studied. The microgrid to be studied here is composed of distributed generation system(DGS), battery systems and loads. The distributed generation systems include combined heat and power(CHP) and small generators such as diesel generators and the renewable energy generators such as photovoltaic(PV) systems, wind power systems. Both of thermal loads and electrical loads are included here as loads. Also the emissions trading scheme to be applied in near future, the cost of unit start-up and the operational characteristics of battery systems are considered as well as the probabilistic characteristics of the renewable energy generation and load. A mathematical equation for optimal operation of this system is modeled based on the mixed integer programming. It is shown that this optimization methodology can be effectively used for economical operation of a microgrid by the case studies.

• 대한건축학회연합논문집
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• 제21권5호
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• pp.161-168
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• 2019

The use of various digital tools makes freeform modeling possible. At the same time, with the development of structural and construction technologies, Free-Form Architecture are beginning to be implemented realized, as the desired data extraction such as the size and coordinate points of the members is possible. Currently, in many cities around the world, Irregular-Shaped High-rise Buildings, which express the dynamic symbolism, are recognized for their landmark values. In order to realize the Irregular-Shaped High-rise Buildings, it is necessary to understand various fields such as the characteristics of digital tools, digital technique logic, design process, and construction method. In particular, it is important to plan Irregular-Shaped High-rise Buildings so that the various types of efficiency can be reviewed together, while generating understanding and formations from the initial design stage. Therefore, this study uses conceptual and parametric design tools related to form generation in digital architecture to analyze the details, methods, and characteristics of the Irregular-Shaped High-rise Buildings form generation process. In this paper, the parametric design tool is applied to study the various types of design and the process characteristics that can be considered in the initial design stage of the unstructured skyscraper.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2214-2216
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• 2005

This paper is researched discharge and ozone generation characteristics of ozonizer using $Al_2O_3$ Ceramic dielectric. The discharge characteristics with variation of the discharge electrode area is studied. The characteristics of ozone concentration. ozone generation and ozone yield were measured to discharge power, discharge electrode area and supplied gas flux for oxygen and air. The solubility of ozone for water concentrations and ozone generations proportional to discharge power and discharge electrode area. Ozone yield has slowly increase with Increasing discharge power at high flow-rate. As the result, the maximum values of ozone characteristics ozone generation and ozone yield, can be obtained 5817[ppm] and 36[g/kWh]. We make enough the ozone concentration as the air in the home. An electric discharge electrode area is apt to shrink gradually into a miniaturization trend of the ozonizer but the enlargement of the occurrence flight of the electric discharge area gives the characteristic enhance the aid in the identity condition through the structure improvement.

• 패션비즈니스
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• 제27권4호
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• pp.1-20
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• 2023

This study proposes the practical design elements of sustainable fashion by understanding the values of the MZ generation and analyzing the design characteristics that can extend the life of clothing. The theoretical concept of sustainable fashion through previous studies was reviewed and in-depth interviews were conducted with the MZ generation on "design characteristics of clothes that they have actually used for a long time." The result was drawn by approaching the constant comparison method through the qualitative methodology. As a result of the study, the design characteristics of clothes that can be worn for a long time are as follows. First, simple design pursues simplicity that is not excessive to the essential characteristics of clothes. Second, sturdy material is durable and not easily damaged. The clothing storage method and laundry method were also factors that could extend the life of the garment. Third, emotional design is a design that fits well with your mood and body type and gives a special meaning to your emotions. This study is meaningful in suggesting elements necessary for extending the life cycle of clothing and providing basic data that can be applied to the practical design steps of the fashion industry.

• 한국환경보건학회지
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• 제38권6호
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• pp.503-509
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• 2012

Objectives: This study was performed in order to evaluate the generation characteristics of airborne bacteria and fungi while operating a household humidifier, in consideration of user habits. Methods: Microbial samples were collected in a closed chamber with a total volume of 2.76 $m^3$, in which a humidifier was operated according to experimental strategies. A cultivation method based on the viable counts of mesophilic heterotrophic bacteria and fungi was performed. Experimental strategies were divided into three classes: the type of water in the water reservoir (tap water, cooled boiled water); the frequency of filling the reservoir (refill every day, no refill); and the sterilization method (sterilization function mode, humidifier disinfectants). Results: Significant increases in the concentration of airborne bacteria were observed while the humidifier was in operation. The concentration had increased to 2,407 $CFU/m^3$ by 120 hours when tap water filled the reservoir without any application of sterilization, while for cooled boiled water, it was merely 393 $CFU/m^3$ at a similar time point. Usages of disinfectant in the water tank were more effective in decreasing bioaerosol generation compared to sterilization function mode operation. Generation characteristics of airborne fungi were similar to those of bacteria, but the levels were not significant in all experiments. Calculated exposure factor can be used as an indicator to compare biorisk exposure. Conclusion: This study identified the potential for bioaerosol generation in indoor environments while operating a household humidifier. User practices were critical in the generation of bioaerosol, or more specifically, airborne bacteria. Proper usage of a humidifier ensures that any biorisks resulting from generated bioaerosol can be prevented.

• 조명전기설비학회논문지
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• 제16권6호
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• pp.119-125
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• 2002

무성방전형 오존발생장치에서 고농도의 오존을 발생시키기 위해서는 방전공간의 온도를 낮게 유지시켜주는 것이 중요하다. 이때, 방전공간에서 발생된 열을 외부로 전달하기 위한 유전체장벽과 전극간의 접착물질과 접착방법은 전기적, 열적 관점에서 볼 때 방전에 큰 영향을 미치게 된다. 따라서 접착물질과 접착방법은 오존발생에 중요한 변수가 될 수 있다. 본 연구는 접착물질과 방법이 오존발생에 미치는 영향을 조사한 실험적인 결과이다. 접착물질의 종류로는 방열재료로 사용되는 실리콘 화합물질, 전기적인 도전성을 가지는 수지를 사용하였으며 이들의 물성변화를 위해 첨가물질로 차콜(charcoal)을 사용하였다. 결과적으로 접착물질(실리콘 화합물)이 사용되었을 때가 사용하지 않았을 때보다 같은 전압에서 많은 오존발생량을 보여주었다. 또한 접착물질이 사용되었을 때는 순수한 실리콘 화합물이 사용된 경우가 도전성을 가지는 접착물질이 사용되었을 때보다 많은 오존발생량을 보여주었다.

• 한국융합학회논문지
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• 제12권12호
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• pp.177-183
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• 2021

새로운 소비 주체로 떠오르는 MZ세대는 기성세대의 가치 중심적인 성향과 달리 소비를 일종의 놀이로 인식해 개인의 행복과 만족감을 중요시하며 타 세대에 비해 유희적 특성이 명확하게 드러나는 세대이다. 이에 본 연구는 MZ세대의 보편적인 유희 활동 중 하나인 음악 스트리밍 앱의 핵심 기능인 재생화면의 유희적 자극을 줄 수 있는 인터랙션 요소에 대한 사용자들의 니즈를 파악했다. 선행 연구를 통해 MZ세대의 유희적 특성뿐만 아니라 인간의 유희적 특징과 유희와 예술의 관계성을 파악하고 유희적 요소로 활용할 수 있는 마이크로인터랙션과 게이미피케이션의 개념과 특징을 정리하였다. 또한 기존 음악 앱의 재생화면 사례 분석을 통해 현황을 파악하고 맥락적 조사 방법을 통해 사용자 인터뷰를 진행하였다. 이후 사용자 행동 패턴 분석을 바탕으로 재생화면에 유희적 요소를 적용하는 것에 대한 긍정적인 니즈를 파악하고 이를 바탕으로 유희적 인터랙션을 통한 몰입감 있는 음악 감상 경험제공에 대한 가능성을 확인했다.

• 문화기술의 융합
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• 제10권4호
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• pp.105-109
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• 2024

본 연구는 저출산과 사회 변화로 인해 점점 더 심각해지고 있는 군간부 인력 충원 문제를 분석하고, MZ세대의 특성을 고려한 인력 충원 전략을 모색하고자 한다. 군은 북한의 지속적인 군사적 위협 속에서 안보를 지키기 위해 노력하고 있으나, 저출산으로 인해 병역 자원이 급감하고 있어 인력 충원에 직접적인 영향을 미치고 있다. 또한, MZ세대의 가치관 변화와 군 조직 문화의 괴리로 인해 우수 인재 유치에도 어려움을 겪고 있다. MZ세대는 일과 삶의 균형, 수평적 관계, 자아실현 등을 중시하며, 권위적이고 수직적인 군 조직 문화는 이들에게 매력적으로 다가오지 않는다. 이에 본 연구는 군의 인력 충원 문제점을 진단하고, MZ세대의 특성을 반영한 맞춤형 인력 충원 전략을 제시하여, 미래 군의 지속가능한 발전 방향을 모색하는 것을 목적으로 한다.