부정교합 모델을 적용한 가상현실 시뮬레이션에 대한 인식조사

김보람,류지헌,김선미,최남기,Kim, Boram,Ryu, Jeeheon,Kim, Seonmi,Choi, Namki 대한소아치과학회 2021 大韓小兒齒科學會誌 Vol.48 No.3

이 연구의 목적은 부정교합 모델을 적용한 프로토타입 가상현실(Virtual Reality, VR) 시뮬레이션을 개발하고, 치과 전공의와 치과대학생 간의 수행 결과 및 만족도 설문 비교를 통해 VR 시뮬레이션의 치의학 교육에의 응용 가능성을 평가하는 것이다. 참가자들은 가상 부정교합 모델을 관찰한 후 부정교합의 유형을 진단하고, 가상 부정교합 모델에 나타나는 임상 소견과 적절한 치료계획을 결정하는 세 가지 과제를 수행하였고, 총 5문항으로 구성된 만족도에 관한 설문을 작성하였다. 전공의 집단의 부정교합 평가에 관한 수행능력은 학생 집단과 비교해 유의하게 높았으며(p < 0.01), 두 집단 모두에서 첫 번째 증례를 수행하는 시간보다 두 번째 증례를 수행하는 시간이 유의하게 감소하였다(p < 0.01). 만족도 설문에서는 모든 문항에 대해 보통 이상의 긍정적인 반응을 보였다. 추후 VR 시뮬레이션의 지속적인 개발이 이루어진다면 가치 있는 교육 도구로 응용될 수 있을 것이다. The purpose of this study was to develop prototype of virtual reality(VR) simulation with malocclusion models and evaluate its applicability. Task abilities, task completion time, and a satisfaction survey were compared between dentist trainees and dental students. Participants were instructed to observe virtual malocclusion models and then performed three tasks to diagnose the type of malocclusion, determine clinical findings and develop treatment plans. Their satisfaction with the simulation experience were evaluated using a questionnaire containing five questions. Task abilities of trainees related to clinical features and treatment plans were significantly higher than that of students(p < 0.01). In both groups, the task completion time for the second case was significantly reduced compared to that for the first case(p < 0.01). The satisfaction survey showed high scores and positive responses for this simulation in both groups. If the prototype of VR simulation is continuously advanced, it will be applicable for orthodontic education in pediatric dentistry.

열처리에 의한 폐 인쇄회로기판의 물성변화

김보람,박승수,김병우,박재구,Kim, Boram,Park, Seungsoo,Kim, Byeongwoo,Park, Jaikoo 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.1

Physical property changes of printed circuit board (PCB) according to heat treatment conditions were investigated. The heat treatment was carried out in air and nitrogen atmosphere at temperature range from $200^{\circ}C$ to $325^{\circ}C$. Thermogravimetric analysis showed that the PCB was pyrolyzed in two steps. The thickness of PCB expanded by 11~28% at about $300^{\circ}C$ in both air and nitrogen atmosphere as layer disintegration occurred. Mechanical strength of PCB decreased from 338.4 MPa to 20.3~40.2 MPa due to the delamination caused by the heat treatment. The heated printed circuit boards were crushed and sieved for analysis of density distribution and liberation degree of copper according to particle size. As a result of the density distribution measurement, non metallic particles and copper particles were concentrated into different size range, respectively. The liberation degree of copper was improved from 9.3% to 100% at size range of $1,400{\sim}2,000{\mu}m$ by heat treatment.

폐리튬이차전지 스크랩 재활용을 통한 양극활물질 전구체 합성 연구

김보람,김대원,김태헌,이재원,정항철,한덕현,정수훈,양대훈,Kim, BoRam,Kim, Dae-Weon,Kim, Tae-heon,Lee, Jae-Won,Jung, Hang-chul,Han, Deokhyun,Jung, Soo-Hoon,Yang, Dae-Hoon 한국결정성장학회 2022 한국결정성장학회지 Vol.32 No.2

A metal salt solution was prepared from valuable metals (Ni, Co, Mn) recovered from a scrap of waste lithium secondary batteries, and an NCM811 precursor was synthesized from the solution. The effect on precursor formation according to reaction time was confirmed by SEM, PSA, and ICP analysis. Based on the analysis results, the electrochemical properties of the synthesized NCM811 precursor and the commercial NCM811 precursor were investigated. The Galvano charge-discharge cycle, rate performance, and Cycle performance were compared, and as a result, there was no significant difference from commercial precursors.

투렛장애 (Tourette syndrome)의 침 치료에 대한 중의학 임상 연구 고찰

김보람,최일신,김기봉,천진홍,Kim, Boram,Choi, Il Shin,Kim, Ki Bong,Cheon, Jin Hong 대한한방소아과학회 2022 대한한방소아과학회지 Vol.36 No.2

Objective This study aimed to analyze randomized controlled trials of the effect of acupuncture on Tourette syndrome and to evaluate the efficacy of the treatment. Methods Based on the China National Knowledge Infrastructure (CNKI) and Pubmed search with the key search terms of 'Tourette syndrome, acupuncture', dated from 2000 to 2021, ten randomized controlled trials were identified and analyzed for this study. Results 1. The most commonly used acupoints were Taechung (LR3), Sinmun (HT7), Hapgok (LI4), Pungji (GB20) and Backhoe (GV20). 2. The most commonly used meridians were Bladder Meridian, Stomach Meridian and Gallbladder Meridian. 3. Acupuncture treatment was found to be significantly more or equally effective than western medicine such as haloperidol and tiapride. Conclusions Based on the results of the randomized controlled trials analyzed in this study, acupuncture was found to be effective in the treatment of Tourette syndrome. However, more clinical studies are needed to prove the effectiveness of acupuncture in Tourette syndrome.

저급 탄산리튬의 재결정화를 통한 고순도 탄산리튬 제조에 대한 연구

김보람,김대원,황성옥,정수훈,양대훈,Kim, Boram,Kim, Dae-Weon,Hwang, Sung-Ok,Jung, Soo-Hoon,Yang, Dae-Hoon 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.1

리튬이차전지 제조 공정 중 발생한 폐액으로부터 회수된 탄산리튬의 경우, 이차전지 양극재의 원료인 코발트, 니켈 및 망간의 중금속이 함유되어 있다. 본 연구에서는 탄산리튬의 재결정화를 통하여 순도 98.28 %의 저급 탄산리튬 분말에 함유된 중금속을 제거하고 탄산리튬의 순도를 높이고자 하였다. 먼저 염산 수용액을 이용하여 탄산리튬의 침출 효율을 살펴보았으며, pH 5 조건으로 침출 후 탄산나트륨의 당량 및 농도의 탄산리튬 재결정에 대한 영향을 확인하였다. 리튬의 함량 기준 대비 탄산나트륨 1 당량에서 1.5로 증가할수록, 농도 1.4 M에서 2.8 M로 증가할수록 회수율은 향상되었으며, 탄산나트륨의 투입 조건이 달라짐에 따라 결정 형상이 달라지는 것을 SEM 분석을 통해 확인할 수 있었다. 재결정된 탄산리튬 분말은 수세하여 순도 99.9 % 이상의 고순도 탄산리튬을 회수할 수 있었다. Lithium carbonate recovered from the waste solution generated during the lithium secondary battery manufacturing process contains heavy metals such as cobalt, nickel, and manganese. In this study, the recrystallization of lithium carbonate was performed to remove heavy metals contained in the powder and to increase the purity of lithium carbonate. First, the leaching efficiency of lithium carbonate according to pH in the aqueous hydrochloric acid solution was examined, and the effect on the recrystallization of lithium carbonate according to the equivalent and concentration of sodium carbonate was confirmed. As the equivalent and concentration of sodium carbonate increased, the recovery rate of lithium carbonate improved. And the SEM image showed that the crystal shape was changed depending on the reaction conditions with sodium carbonate. Finally, the high purity lithium carbonate of 99.9% or more was recovered by washing with water.

폐니켈수소전지에서 회수된 희토류복합 침전분말로부터 세륨 회수에 대한 연구

김보람,안낙균,이상우,김대원,Kim, Boram,Ahn, Nak-Kyoon,Lee, Sang-Woo,Kim, Dae-Weon 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.6

In order to recover the cerium contained in the spent nickel metal hydride batteries (NiMH battery), the recovered rare earth complex precipitates from NIMH were converted into rare earth hydroxides through ion exchange reaction to react with NaOH aqueous solution at a reaction temperature of 70 ℃, for 4 hours. Rare earth hydroxides were oxidized by injecting air at 80 ℃ for 4 hours to oxidize Ce³⁺ to Ce⁴⁺. The oxidation rate of cerium was confirmed to be about 25 % through XPS, and the oxidized powder was separated from the rest of the rare earth using the difference in solubility in dilute sulfuric acid. The finally recovered powder has a crystal phase of cerium hydroxide (Ce(OH)₄). The cerium purity of the final product was about 94.6 %, and the recovery rate was 97.3 %.

급변류에 의한 하상변동 예측을 위한 수심적분 수치모형

김보람,김대홍,Kim, Boram,Kim, Dae-Hong 한국수자원학회 2014 한국수자원학회논문집 Vol.47 No.11

천이류와 같은 급변류에 의한 하상변동을 예측하기 위한 이차정확도의 유한체적법 모형을 제시하였다. 부정류 조건하에서의 유사이송과 하상변동문제에 적용하기 위하여 유사이송모형을 천수방정식과 연계하였다. 지배방정식은 MUSCL 기반의 유한체적법을 이용하였고, 계산요소간 흐름률은 HLLC approximate Riemann solver를 이용하여 계산하였다. 일차원과 이차원 수로에서의 댐붕괴파에 의한 하상변동문제와 월류로 인한 하류부 댐사면의 침식문제에 적용한 결과, 적정한 매개변수를 이용하는 경우에 전반적으로 정확한 수치모의 결과를 얻을 수 있었다. 또한 전반적인 계산결과는 수치적으로 안정적이고 물리적으로 타당한 결과를 나타내었고, 이로부터 제시된 수치모의 기법이 상류와 사류조건하에서의 하상변동 문제에 적용이 가능할 것으로 판단된다. A stable second-order finite volume method was proposed to predict sediment transport under rapidly varied flow conditions such as transcritical flow. For the use under unsteady flow conditions, a sediment transport model was coupled with shallow water equations. HLLC approximate Riemann solver based on a monotone upstream-centered schemes for conservation laws (MUSCL) reconstruction was used for the computation of the flux terms. From the comparisons of dam break flow experiments on erodible beds in one- and two-dimensional channels, good agreements were obtained when proper parameters were provided. Lastly, dam surface erosion problem by overtopped water was simulated. Overall, the numerical solutions showed reasonable results, which demonstrated that the proposed numerical scheme could provide stable and physical results in the cases of subcritical and supercritical flow conditions.

중국인 싱글족의 식생활 유형별 편의식품 소비와 삶의 질과의 관계

김보람,주나미,Kim, Boram,Joo, Nami 한국식품영양학회 2016 韓國食品營養學會誌 Vol.29 No.5

In this study, we analyzed the dietary style of Chinese singles; in addition, the effect of convenience food consumption on the quality of life of singles was evaluated through construct model development on the relationship between the frequency of consumption and satisfaction with convenience food and quality of life. A statistical analysis of 153 surveys from Tianj was conducted using SPSS 12.0 for Windows and SEM using AMOS 5.0 statistics package. The reliability of the data was confirmed by an exploratory factor analysis and Cronbach's alpha coefficient. The measurement model was confirmed as appropriate by a confirmatory factor analysis of the measurement model in conjunction with AMOS. The results of a factor analysis were as follows. Dietary style was categorized into four factors. The level of satisfaction with convenience food was categorized into seven factors and quality of life was categorized into four factors. The reliability of these findings was supported by a Cronbach's alpha coefficient of 0.6 and higher for all the factors. For the level of satisfaction with convenience food based on dietary style and the quality of life of singles, a structural equation model was constructed and analyzed. The results of all tests indicated that the model satisfied the recommended level of goodness of fit index and thus, the overall research model was appropriate. The current study highlights the increased interest in eating habits of singles and is necessary for further improvement in nutrition education.

지방자치단체의 협력적 물 거버넌스 구축을 위한 네트워크 분석: 제주특별자치도의 물관리 사례를 중심으로

김보람,양원석,안종호,Kim, Boram,Yang, Wonseok,Ahn, Jongho 한국수자원학회 2020 한국수자원학회논문집 Vol.53 No.9

본 연구는 네트워크 접근을 통해 지역 물관리의 구조적 특징과 주요 행위자를 밝히고 지방자치단체 차원의 협력적 물 거버넌스 구축을 위한 함의를 도출한다. 이를 위해 본 연구는 사회연결망분석(social network analysis)을 활용하여 제주특별자치도 물관리 네트워크의 주요 행위자와 이들의 역할 및 관계를 실증적으로 분석하고 소시오그램(sociogram)으로 도식화한다. 연구결과, 제주지역의 행정부서 간 물관리 업무 네트워크와 민·관 정책네트워크(정보 공유 및 협의), 전체 네트워크와 이수 및 수질 영역별 네트워크의 구조적 특징과 중심 행위자가 상이한 것으로 나타났다. 향후 지방자치단체의 협력적 물 거버넌스 구축을 위해서는 이수 및 수질 담당 행정부서 간 협업관계를 개선하고, 공공·민간 부문을 포함한 전체 이해관계자 간 정보 공유 및 협의가 활성화되어야 한다. 이처럼 지역 물관리 이해관계자 간의 공식적·비공식적 네트워크를 관리하기 위한 정책적 노력이 중요하다.

국제해운 탈탄소화에 따른 선원의 정의로운 전환(Just transition)

김보람(Boram Kim),박한선(Han-seon Park),정민지(Min-ji Jeong),김지호(Ji-ho Kim) 한국해양환경·에너지학회 2023 한국해양환경·에너지학회 학술대회논문집 Vol.2023 No.05