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.

강재 영구거푸집을 사용한 yLRC 합성기둥의 내화성능 연구

김보람,강성덕,김형근,김명한,김상대,Kim, Bo Ram,Kang, Seong Deok,Kim, Hyung Geun,Kim, Myeong Han,Kim, Sang Dae 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.3

yLRC 합성기둥은 기존 합성기둥의 장점과 거푸집 공사의 절감을 가져올 수 있으며, CFT와 비교하였을 때 강재량 감소의 효과와 함께 콘크리트의 충전상태를 육안으로 쉽게 확인할 수 있는 등의 장점을 가지고 있다. 실험결과와 연구를 통하여 yLRC 합성기둥의 구조체로서의 내력은 검증이 되었으나 내화성능에 관한 연구는 수행되지 않았다. 이에 본 논문에서는 yLRC 합성기둥의 내화성능 평가를 위해 콘크리트 면적비, 보강판, 피복유무 등을 변수로 두어 실험과 해석을 수행하였으며, 실험과 해석결과를 비교 고찰하여 내화 성능 평가를 하였다. The main objective of this paper is to study the behaviour of yLRC composite columns at elevated temperatures by experimental test. The effects of load ratios, cross-section size and fire protection for the yLRC columns were investigate d by the test and compared using the heat transfer analysis perfo rmed based on the finite element program ANSYS 10.0 using the ISO834 standard fire curve, following the main guidelines proposed by the EC4 Part 1.2. As heat transfer is the movement of heat by conduction, convection, and radiation, and as temperature inside an object varies by position and time, time. As the steel's thermal conductivity is higher than that of concrete, steel loses its strength rapidly in a high-temperature situation such as a fire. Fire resistance performance of the yLRC composite column under fire conditions was evaluated througheat transfer analysis for parametric study.

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.

대칭성 분석과 레벨셋을 이용한 자기공명 뇌영상의 자동 종양 영역 분할 방법

김보람,박근혜,김욱현,Kim, Bo-Ram,Park, Keun-Hye,Kim, Wook-Hyun 한국융합신호처리학회 2011 융합신호처리학회 논문지 (JISPS) Vol.12 No.4

본 논문은 자기공명 뇌영상을 대상으로 뇌종양 영역을 자동으로 분할하기 위한 방법을 제안한다. 정상적인 뇌영상은 좌우로 대칭인 특징을 지니는 반면에 종양이 존재하는 뇌영상은 종양세포와 부종 및 괴사로 인해 비대칭적인 특징을 가진다. 본 논문에서는 이러한 대칭성을 뇌영상내에 종양영역의 존재 유무를 판별할 수 있는 기준으로 이용한다. 대칭성 분석을 위해서 뇌영역의 윤곽선 정보를 이용해 중심축을 생성하였으며 이는 사전정보를 이용하지 않고 영상의 자체 정보만을 해석해서 중심축을 추출할 수 있다는 점에서 기존의 영상 정합을 통해 해부학적 위치 정보를 추출하고 이를 이용하여 중심축을 찾는 방법과 구별된다. 자기공명 영상에서 정상뇌의 조직은 크게 3가지 클러스터로 분할되며 각 클러스터가 포함하는 영역은 백질과 회백질영역을 포함하는 뇌 실질영역, 뇌척수액(csf)영역, 두개골, 지방 및 뇌막 영역 등으로 나뉜다. 종양이 포함된 영상은 종양과 부종 및 괴사 영역이 추가적으로 존재하며 이는 클러스터링을 이용한 분할을 통해서 구분될 수 있다. 분할된 종양 영역의 중심점은 다음 슬라이스의 종양 영역의 경계를 검출하기 위한 레벨셋 알고리즘에 적용되어 전체 볼륨의 종양 영역의 경계선을 추출하기 위한 초기 시드로 이용된다. 본 논문에서는 3차원 볼륨의 영상(슬라이스)중에서 종양 영역이 존재하는 슬라이스의 종양 영역을 분할하여 이후의 슬라이스에서는 분할작업을 수행하지 않고 영역의 경계선만 추출한다. 자카드 지수와 처리 시간의 비교 분석을 통해 기존의 방법과 비슷한 성능과 빠른 속도로 종양 영역을 분할할 수 있다는 것을 보인다. In this paper, we proposed the method to detect brain tumor region in MR images. Our method is composed of 3 parts, detection of tumor slice, detection of tumor region and tumor boundary detection. In the tumor slice detection step, a slice which contains tumor regions is distinguished using symmetric analysis in 3D brain volume. The tumor region detection step is the process to segment the tumor region in the slice distinguished as a tumor slice. And tumor region is finally detected, using spatial feature and symmetric analysis based on the cluster information. The process for detecting tumor slice and tumor region have advantages which are robust for noise and requires less computational time, using the knowledge of the brain tumor and cluster-based on symmetric analysis. And we use the level set method with fast marching algorithm to detect the tumor boundary. It is performed to find the tumor boundary for all other slices using the initial seeds derived from the previous or later slice until the tumor region is vanished. It requires less computational time because every procedure is not performed for all slices.

사지 재건에 있어 서혜부 유리 피판술의 적응증 및 예후 인자

김보람,한수봉,강호정,최윤락,김선용,Kim, Bo-Ram,Hahn, Soo-Bong,Kang, Ho-Chung,Choi, Yun-Rak,Kim, Sun-Yong 대한미세수술학회 2009 Archives of reconstructive microsurgery Vol.18 No.2

There are several advantages for groin flap, but its small and unpredictable vessels of pedicle have made it to lose its initial popularity. Although it would be ideal flap when it is focused on its useful advantages such as relative larger size, low donor site morbidity and possible bone graft, there have been few studies for prognostic factors for successful groin flap. Authors intended to determine prognostic factors which are relative with success of free groin flap. From January 1985 to December 2007, 107 patients who underwent groin flap for reconstruction of extremities were selected consecutively. Univariate and multivariate analysis were performed to determine prognostic factors which were related with success of groin flap. Eighty of 107 (74.8%) flaps survived. There was significant difference in success rate according to the recipient site. Nineteen of 20 cases (95%) survived in upper extremities, but 61 of 87 cases (70.1%) survived in lower extremities, which was statistically significant (p=0.022). Univariate analysis showed that mean diameter of donor veins was significantly larger in success group (p=0.021). Groin flap is recommended for reconstruction of upper extremities than lower extremities. It is thought to be critical that surgeons try to match vessel diameters between donor and recipient site.

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.

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.

POE를 통한 친환경건축물 인증 공동주택 인공환경 녹화 관리 실태 및 개선방안 연구

김보람,안동만,Kim, Bo-Ram,Ahn, Tong-Mahn 한국조경학회 2012 韓國造景學會誌 Vol.40 No.6

본 연구는 친환경건축물 인증 공동주택의 지속가능성 증진을 위한 연구로서, 2007년 6월부터 2008년 6월 사이에 한국토지주택공사 토지주택연구원에서 친환경건축물 본인증을 획득한 서울 경기지역 공동주택 8곳을 선정하여 "생태환경을 고려한 인공환경 녹화기법 적용여부(이하, 인공환경 녹화)" 평가항목의 거주후 평가(POE)를 수행하였다. 연구 목적은 친환경건축물 인증 공동주택의 인공환경 녹화 부문 관리 실태와 문제점을 파악하여 향후 재인증 규정 및 사후관리에 시사점을 제공하는 것이다. 이를 위하여 현장관찰조사와 관리자 면담 및 거주후 평가를 실시하였고, 분석 결과 도출한 문제점은 다음과 같다. 첫째, 친환경 인증 공동주택 단지에 도입된 생태환경을 고려한 인공환경 녹화 계획요소의 사후관리가 제대로 이루어지지 않고 있다. 둘째, 인공환경 녹화에 대한 만족도는 전반적으로 낮았으며, 옹벽대체녹화가 담장녹화, 옥상녹화, 벽면녹화에 비해 만족도가 높았다. 평가항목별 만족도는 질적 수준, 설계목적 부합 여부, 식생 관리상태, 식생 생육상태가 평균보다 낮은 만족도를 보였다. 셋째, 인공환경 녹화 만족도는 질적 수준에 대한 만족도에 가장 큰 영향을 받으며, 나머지 요인들도 만족도와 통계적으로 유의미한 관계에 있음을 알 수 있었다. 현 인증 제도는 유지관리 평가기준이 미비하여 관리상태가 소홀하고, 이는 전체적인 인공환경 녹화 만족도 저하에 영향을 미친다. 따라서 인증심사와 별도로 운영되는 사후관리 제도의 도입이 요구되며, 인증 취소나 벌점부과와 같은 적극적인 관리 규제 확충방안이 모색되어야 할 것이다. This study aims to suggest ways to improve sustainability on housing complexes. This study sampled eight housing projects in Seoul and GyeongGi-Do in Korea, which were completed in June 2007 and June 2008. Then, are retention and maintenance on "constructed greens for ecological environment" including "green structures substitutes retaining walls", "green roofs", and "green walls." Study methods are field investigations of the sampled sites, and Post Occupancy Analysis. Major findings were; 1) "constructed greens" are not well retained in more sites and and this implies the GBCS(Green Building Certification System) does not meet its objectives well, 2) User showed lower user satisfaction to "constructed greens". User satisfaction concerning "green structures substitute retaining walls" was higher than the satisfaction on the other constructed green type. Satisfaction Assessment Criteria lower 1han average were "level of quality", "meet the design objectives", "vegetation management status", "vegetation maintenance". 3) User satisfaction was strongly correlated on the level of quality factor of "constructed green". In addition, tue other factors are the significant correlations between the satisfactions. The present GBCS has inadequate assessment standards for maintenance, which lead to lower the entire satisfaction. Therefore, periodic recertification system, education and information providing for the managing personals, and incentives for good maintenance or disincentive for poor maintenance of the "constructed greens" are suggested to improve the GBCS.

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.

화장품 소재로서 줄풀뿌리 추출물의 생리활성 연구

김보람,유은주(Bo-Ram Kim,Eun-Ju You) 한국뷰티산업학회 2016 뷰티산업연구 Vol.10 No.2

현대사회의 화장품은 항산화 작용, 미백, 주름개선 등 다양한 기능이 강조된 화장품의 수요가 크게 증가하고 있으며 친환경적인 제품에 대한 소비자의 선호도 증가와 안전성 측면에서 천연물로부터 유효성분을 추출, 정제하여 효능을 검증하는 소재개발 연구가 활발히 이루어지고 있다. 본 논문에서는 줄풀뿌리의 MeOH 추출물과 용매분획물의 항산화 활성을 측정하기 위하여 DPPH 소거활성을 측정하였으며 미백화장품으로서의 검증을 위해 tyrosinase 저해활성, 주름개선 화장품으로서의 검증을 위해 elastase 저해활성을 측정하였다. DPPH radical 소거활성을 측정한 결과, 줄풀뿌리 MeOH 추출물은 100 μg/mL 농도에서 83.47%, 50 μg/mL 농도에서는 53.93%, 25 μg/mL 농도에서는 27.71%로 농도의존적인 저해활성을 나타냈으며 n-hexane 분획과 물 분획에서 MeOH 추출물과 유사한 소거활성을 나타내었다. Tyrosinase 저해활성을 측정한 결과 n-hexane 분획으로 활성이 이행됨을 확인할 수 있었으며 elastase 저해활성을 측정한 결과 줄풀뿌리 MeOH 추출물은 100 μg/mL 농도에서 67.43%, 50 μg/mL 농도에서 53.28%, 25 μg/mL 농도에서 23.60%의 저해활성이 나타났으며 n-Hexane, 물 분획으로 활성이 이행되는 것으로 나타났다. 따라서 줄풀뿌리 추출물은 항산화 활성, 미백 기능성, 주름 개선 기능성 화장품 소재로서 의 응용가능성이 높음을 나타냈다. In the present study, we evaluated on the antioxidant activity, tyrosinase and elastase inhibitory activity of MeOH extract and its solvent fractions of the root of Zizania-latifol(Z. latifol). The free radical scavenging activities of the MeOH extract and its solvent fractions of Z. latifol were assessed by methods using 2,2-diphenyl-1-picrylhydrazyl (DPPH). The antioxidant activities of the MeOH extract of Z. latifol were 83.47% at 100 μg/mL, 53.93% at 50 μg/mL and 27.71% at 25 μg/mL. In addition, n-Hexane layer and water layer of antioxidant activities were very similar to MeOH extract. Tyrosinase inhibition by the MeOH extract of Z. latifol was not proportional to the concentration. Tyrosinase inhibitory activity of n-Hexane layer was similar to that by MeOH extract of Z. latifol, which means the tyrosinase inhibitory activity of the MeOH extract may be metastasized from MeOH to n-Hexane. Elastase inhibition by the MeOH extract of Z. latifol was increased in proportion to MeOH concentration. Elastase inhibitory activity of n-Hexane layer and water layer was similar to that by MeOH extract of Z. latifol, which means the elastase inhibitory activity of the MeOH extract may be metastasized from MeOH to n-Hexane and water. Accordingly, the MeOH extract and its solvent fractions of the root of Z. latifol can be evaluated to satisfy necessary and sufficient condition as the plant-origin multi-functional material that is pursued in this research and is thought to be suitable as the functional material for multi-functional cosmetics in future.