Drowning-out을 이용한 HNIW의 평균 입경 및 결정형 제어

임가은,이재은,김왕수,김재경,한상근,채주승,이근득,구기갑 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

ε-HNIW(Hexanitrohexaazaisowurtzitane)는 6 NO2의 isowurtzitane 구조를 가진 니트라민계 화합물로 HMX, RDX 등의 기존의 추진제보다 높은 밀도와 폭압, 산소함유량을 가지는 차세대 고체 추진제로 각광받고 있다. 최근 HNIW에 대한 연구가 활발히 진행되면서 추진제 조성물의 둔감성 향상을 위해 서브마이크론 수준의 ε-HNIW 입자에 대한 중요한 과제로 대두되고 있다. 본 연구에서는 drowning-out을 이용하여 서브마이크론 수준의 HNIW 입자를 제조하였으며, 반용매 조성, 교반 시간, 포화 온도에 따른 HNIW의 입도 및 결정형 변화를 관찰하였다.

응집을 이용한 코어-쉘 구조 에너지 복합체 제조

임가은,이현주,심홍민,김재경,김현수,구기갑 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

과염소산암모늄(AP)은 고체 추진제의 주원료로 널리 사용되고 있는 산화제로 최근 기존 AP 고체 추진제의 단점을 극복하기 위한 다양한 연구가 진행되고 있다. 그 중에서도 코어-쉘 구조의 복합체의 경우 구성성분 간 열 및 물질전달 속도를 향상시켜 뛰어난 연소 특성을 갖기 때문에 차세대 에너지 구조체로 각광받고 있다. 특히 에너지 물질 중 하나인 1,1-diamino-2,2-dinitroethene(DADNE)는 AP와 복합체로 제조될 경우 민감도가 감소되며 고체 추진제의 열안정성과 밀도 그리고 충격 감도의 성능을 향상시키는 효과가 기대된다. 본 연구에서는 Drowning-out 결정화를 이용하여 미립자의 AP와 DADNE를 석출시키고 가교액을 투입하여 응집을 유도, 코어-쉘 구조의 DADNE/AP 복합체를 제조하였다. 복합체의 입도는 가교액 주입량과 교반 속도에 큰 영향을 받는 것으로 확인되었으며 가교액의 투입 시간을 제어하면 약 2mm 크기의 복합체도 제조할 수 있었다.

COVID-19 감염완화를 위한 환기량 증가 시 에너지소비량 변화 추정

임가은, 서동현 충북대학교 건설기술연구소 2023 충북대학교 건설기술연구소 논문집 Vol.42 No.1

본문참고

COVID-19 감염완화를 위한 환기량 증가 시 에너지소비량 변화 추정

임가은 ( Lim Ga-eun ),서동현 ( Seo Dong-hyun ) 충북대학교 건설기술연구소 2023 建設技術論文集 Vol.42 No.1

It is effective when ventilation is increased to prevent viral infection such as COVID-19 indoors. However, an increase in the amount of ventilation inevitably increases the consumption of heating and cooling energy. In this study, the change in energy consumption was estimated when ventilation was increased to prevent COVID-19 infection using the eQUEST prototypical office building model and typical weather data files developed by Chungbuk National University. As a result of the simulation, when the ventilation rate standard of the building increased by 5%, the rate of increase in energy consumption increased by 3.98% in the Central 1 area, 3.81% in the Central 2 area, 2.76% in the Southern area, and 2.15% in the Jeju area. In the next step, after applying heat recovery ventilator (ERV) to minimize the increase in energy consumption due to the increase in ventilation, when the ventilation rate increases by 5%, 0.99% in the Central 1 region, 0.96% in the Central 2 region, 0.58% in the Southern region, and 0.57% in the Jeju region. According to the experimental results, if the ventilation rate is increased by 5% compared to the existing ventilation rate regulation, the annual energy consumption increases by about 2~4% depending on the climate region. However, if ERVs are installed, it is estimated that the virus infection rate can be reduced by recovering most of the energy due to the increase in ventilation and consuming less than 1% of additional energy per region.

Preparation of the spherical nano-Fe2O3/NH4ClO4 composites by reactive crystallization and their characterization

심홍민,임가은,김재경,김현수,구기갑 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-

A lot of attention has been given to incorporation of nano-sized oxides including Fe2O3 in ammonium perchlorate (NH4ClO4, AP)-based solid propellants to enhance their final performance. In the present work, spherical nano-Fe2O3/AP composites were successfully produced by crystallization/agglomeration of AP combined with reactive crystallization of nano-Fe2O3. The synthesized nano-Fe2O3 particles were confirmed to be hematite by XRD, FTIR and Raman. The SEM image showed that the nano-Fe2O3 particles with an average size of 46 nm are deposited on the surface of AP. The catalytic effect of nano-Fe2O3 particles on the thermal decomposition of AP may be explained by TGA data: a majority of the nano-Fe2O3/AP composites are completely decomposed at lower temperature and their decomposition rate of AP is shown to be remarkably enhanced. Furthermore, the activation energy indicates that the existence of nano-Fe2O3 particles is able to reduce the energy barrier associated with an autocatalytic reaction from 130.3 to 86.7 kJ/ mol, which ultimately leads to a decrease in the onset temperature of decomposition of AP.

음파를 이용한 수박 선별: 머신러닝을 활용하여

민승희,임가은,신연우,이태윤,이승환,조대기 한국과학영재교육학회 2023 과학영재교육 Vol.15 No.1

The purpose of this study is to predict the ripeness of watermelon by the hitting sound. It was found that the reverberation time, the thickness of the skin, and the volume of the pulp were significantly correlated with ripeness. The hitting of watermelon can be explained as a damped oscillation, and this was verified through experiments and simulations, and correlation analysis between reverberation time and ripeness. As a result, the reverberation time was selected as an important variable. CNN was used to develop a model that predicts ripeness through the hitting sound of watermelon, which showed 99% accuracy. 4-layer perceptron model using the reverberation time which was selected as an important variable for predicting ripeness was developed. This showed 95.7% accuracy, in conclusion proposing an objective and non-destructive method to determine watermelon ripeness. 본 연구는 수박의 타격음을 통해 수박의 숙도를 예측하는 데 목적이 있다. 이를 위해 숙도별로 미숙과, 적숙과, 과숙과, 피수박로 나뉜 일곱 종류의 수박을 3 set, 총 21개의 실험용 수박을 선정하여 숙도에 따른 타격음과 물리량을 측정했다. 이를 분석한 결과 잔향시간과 과피의 두께, 과육의 부피가 숙도와 유의미한 상관이 있음을 파악하였다. 수박의 타격을 감쇠진동을 이용하여 설명하고 이를 실험 및 시뮬레이션, 잔향시간과 숙도와의 상관관계 분석을 통해 검증하였다. 그 결과 수박을 타격한 후 잔향시간을 중요 변인으로 선정하였다. 수박의 타격음을 통해 숙도를 예측하는 모델 개발을 위해 CNN을 이용하여 학습시킨 결과 99%의 정확도를 보였으며, 수박 숙도 예측의 중요한 변수로 선정한 잔향시간을 이용하여 4-layer perceptron model로 학습을 진행한 결과 95.7%의 정확도를 나타내는 결과를 얻어 수박의 숙도를 예측하는데 잔향시간이 매우 중요한 변인임을 제시하였다.

소셜커머스와 패키지여행을 결합한 Tour Social Commerce 어플리케이션

유연주(Yeon Ju Yoo),임가은(Ga Eun Lim),권영만(Young man Kwon) 한국IT마케팅학회 2015 한국IT마케팅학회 논문집 Vol.1 No.1

In some of the reasons for all the people to enjoy for the first time to people and travel the travel, package travel is an attractive commodity. Since the 1990s, for overseas travel liberalization of government, these packages goods, was released efficiently and economically be able to travel, to the consumer, became more limelight so. However, travel companies that provide package products because it is a company for the purpose of profit creation, by expanding the package option is only toward the high demand travel, have the disadvantage of only having a narrow travel selection. Therefore, in this paper, for people who want a variety of cultural experiences, and try to provide a wide travel information of more width and the concept of social commerce, combining the concept of a travel company that offers convenient travel planning services referred to as "Tour Social Commerce"We've developed an application. This complements the shortcomings of the existing package travel, and offer a wide travel information of more width, is expected to help travelers who have been frustrated to the existing package travel.

현관문용 스마트 보안시스템 구현

유연주(Yeon Ju Yoo),임가은(Ga Eun Lim),권영만(Young man Kwon) 한국IT마케팅학회 2015 한국IT마케팅학회 논문집 Vol.1 No.1

Recently, South Korea types of furniture due to a change in the society has become diverse. Even though a trend that a growing number of one person households among them, these one-person households, the trees are one of the era, naturally crimes aimed at single home has increased. In this way, it has become increasingly have more and more big crime anxiety 1 or ward that increased, more of the home is not a safe place, is urgent measures for one or ward safety. Therefore, in this paper, these one-person households using Arduino for socially vulnerable, was the design and implementation of entrance door security system.. In other words, it is a smart security system that can sound the alarm sound while watching the distance between the people who are standing in front of the front door in conjunction with Ado~uino and mobile phone. Through these systems as well as psychological threats one-person households, and are expected to also help physical threats, Further we expect also that the number of contributions to lower crime rate country. In addition, you can add such as the future to 112 features and notification function, even to try to give an effective support to users of crime prevention.

현관문용 스마트 보안시스템 구현

유연주(Yeon Ju Yoo),임가은(Ga Eun Lim),권영만(Young man Kwon) 한국IT마케팅학회 2015 한국IT마케팅학회 학술대회 Vol.2015 No.1

Recently, South Korea types of furniture due to a change in the society has become diverse. Even though a trend that a growing number of one person households among them, these one-person households, the trees are one of the era, naturally crimes aimed at single home has increased. In this way, it has become increasingly have more and more big crime anxiety 1 or ward that increased, more of the home is not a safe place, is urgent measures for one or ward safety. Therefore, in this paper, these one-person households using Arduino for socially vulnerable, was the design and implementation of entrance door security system.. In other words, it is a smart security system that can sound the alarm sound while watching the distance between the people who are standing in front of the front door in conjunction with Ado~uino and mobile phone. Through these systems as well as psychological threats one-person households, and are expected to also help physical threats, Further we expect also that the number of contributions to lower crime rate country. In addition, you can add such as the future to 112 features and notification function, even to try to give an effective support to users of crime prevention.

소셜커머스와 패키지여행을 결합한 Tour Social Commerce 어플리케이션

유연주(Yeon Ju Yoo),임가은(Ga Eun Lim),권영만(Young man Kwon) 한국IT마케팅학회 2015 한국IT마케팅학회 학술대회 Vol.2015 No.1

In some of the reasons for all the people to enjoy for the first time to people and travel the travel, package travel is an attractive commodity. Since the 1990s, for overseas travel liberalization of government, these packages goods, was released efficiently and economically be able to travel, to the consumer, became more limelight so. However, travel companies that provide package products because it is a company for the purpose of profit creation, by expanding the package option is only toward the high demand travel, have the disadvantage of only having a narrow travel selection. Therefore, in this paper, for people who want a variety of cultural experiences, and try to provide a wide travel information of more width and the concept of social commerce, combining the concept of a travel company that offers convenient travel planning services referred to as "Tour Social Commerce"We've developed an application. This complements the shortcomings of the existing package travel, and offer a wide travel information of more width, is expected to help travelers who have been frustrated to the existing package travel.