6.1 지방선거 보도를 열심히 모니터링 해봤슈

권나연,김윤아,도효정,송수경,최수아,김주리,최원석 (사)방송기자연합회 2022 방송기자 Vol.67 No.-

K-modes 클러스터링을 활용한 절도범죄 유형화 연구

권나연,권은서,정성원 대한건축학회 2020 대한건축학회논문집 Vol.36 No.8

Data mining is receiving attention as a way to derive useful knowledge and patterns from crime data. Among the data mining techniques,clustering is utilized in the criminal field mainly to analyze hot spots or occurrence patterns. However, most research is concluded at theclustering stage and thus there is a lack of works that examine the relationship between the derived cluster and the surrounding environment. As precedent research has shown that the factors in the occurrence of crimes are not only attributed to individual characteristics but alsoreflect the environmental characteristics of an area, there is a need for research that goes further than simply deriving clusters to analyze therelationships between clusters and other environmental factors. Of these environmental factors, land usage is a basic tool and a result ofurban planning. Therefore, clarifying the relationship between land usage and crime could provide basic data for crime prevention through theimprovement and management of urban spaces from an urban planning perspective. This research uses k-modes clustering to categorizeincidences of theft and then analyzes the derived space and time distribution pattern of crime types by land usage utilizing a geographicinformation system (GIS). Dongjak-gu, which has a relatively low safety level among the areas of Seoul, was selected as the location foranalysis, and data on thefts from 2004 to 2015 were used. Repeating the analysis 1,000 times on each k value from the k-modes clusteringshowed that there were four types of theft cluster in Dongjak-gu. In order to analyze the correlation between each cluster and land usage, aregression analysis was conducted on the land usage variables in Dongjak-gu and the clustering data. The results showed that thefts thatoccurred in Dongjak-gu could be categorized into four types. Cluster1 contained miscellaneous thefts that mainly occurred in commercialfacilities at night and targeted males, and it had the most significant relationship with commercial land. Cluster2 consisted of housebreakingthefts that mainly occurred in the morning and targeted women, and it had the most significant relationship with type 2 general residentialareas. Cluster3 contained street thefts, mainly related to automobiles in the early morning and targeting men, and it had the most significantrelationship with commercial land. Cluster4 was made up of miscellaneous thefts in the afternoon mainly targeting men and it was the onlycluster to have a significant relationship with school and gas station land. These results can be used to contribute to strengthening crimeprevention measures to sufficiently respond to various types of theft, and as theoretical grounds to determine areas vulnerable to crime andset protection spaces in the urban planning and design stages. 본 연구에서는 K-modes Clustering을 활용하여 절도범죄를 유형화하고 도출된 범죄유형의 토지이용별 시·공간적 분포패턴 분석을 목적으로 한다. 서울에서 비교적 안전도가 낮은 A구를 분석대상지로 선정하여 2004~2015년까지의 절도범죄 데이터를 활용했다. 분석결과, A구에서 발생하는 절도범죄는 4가지 유형으로 정의할 수 있다. 이러한 분석결과는 여러 유형의 절도범죄에 충분히 대응할 수 있는 범죄예방대책을 강화하는데 기여할 수 있으며 도시계획 및 설계단계에서 범죄취약지역 및 방어공간 설정에 이론적 근거로 활용할 수 있다.

수족냉증 환자의 월경 특성에 관한 연구

권나연,이동녕 대한한방부인과학회 2019 大韓韓方婦人科學會誌 Vol.32 No.3

Objectives: This study was aimed to analyze clinical characteristics and menstrual pattern of female patients who have cold hypersensitivity on hands and feet. Methods: This study was performed from May, 2018 to April, 2019. We checked the patients’ hand and feet’s temperature and those who diagnosed with cold hypersensitivity filled in survey. Data were collected from 27 participants and we divided data into 2 group; Dysmenorrhea group and Non-dysmenorrhea group. Results: Throughout the study, we found out differences between 2 groups in age, height, weight, VAS score of cold hypersensitivity on hands and feet, menstrual pattern, upper and lower extremity temperature difference, pattern identification, VAS of menstrual pain, and pattern of leukorrhea. Conclusions: By analyzing of study, Dysmenorrhea group’s VAS score of cold hypersensitivity on hands and feet was 6.67±1.73, Non-dysmenorrhea group’s VAS score of cold hypersensitivity on hands and feet was 7.78±1.72 (p-value 0.015). This shows that the degree of hypersensitivity on hands and feet is not necessarily proportional to the degree of menstrual pain.

Universal Polymeric Hole Transporting Material for Solution-Processable Green and Blue Thermally Activated Delayed Fluorescence-OLEDs

권나연,제현두,박수홍,박진영,강민지,박채영,곽하은,조민주,최동훈 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

도시공원 면적이 유아 행복감에 미치는 영향에 대한 인과관계 연구

권나연,김찬민 한국통계학회 2023 응용통계연구 Vol.36 No.1

Many existing studies have found significant correlations between green spaces, including urban parks, and children's happiness. Furthermore, it was implied that the area/proximity of the urban park would be effective in enhancing infancy happiness. However, inferring causal effects from observed data requires appropriate adjustment of confounding variables, and from this perspective, the causal relationship between the area of urban parks and children's happiness has not been well understood. The causal effect of urban parks on children's happiness was estimated in this study using data from the panel study on Korean children. As methods for adjusting confounding variables, regression adjustment using a regression method, weighting method, and matching method were used, and key concepts of each method were described before the analysis results. Confounders were chosen for the analysis using a directed acyclic graph. In contrast to previous research, the analysis found no significant causal relationship between the size of the city park and children's happiness.

텅스텐 산화물의 환원을 이용한 나노/마이크로 크기 텅스텐 혼합분말 제조

권나연,정영근,오승탁,Kwon, Na-Yeon,Jeong, Young-Keun,Oh, Sung-Tag 한국재료학회 2017 한국재료학회지 Vol.27 No.10

An optimum route to fabricate a hybrid-structured W powder composed of nano and micro size powders was investigated. The mixture of nano and micro W powders was prepared by a ball milling and hydrogen reduction process for $WO_3$ and W powders. Microstructural observation for the ball-milled powder mixtures revealed that the nano-sized $WO_3$ particles were homogeneously distributed on the surface of large W powders. The reduction behavior of $WO_3$ powder was analyzed by a temperature programmed reduction method with different heating rates in Ar-10% $H_2$ atmosphere. The activation energies for the reduction of $WO_3$, estimated by the slope of the Kissinger plot from the amount of reaction peak shift with heating rates, were measured as 117.4 kJ/mol and 94.6 kJ/mol depending on reduction steps from $WO_3$ to $WO_2$ and from $WO_2$ to W, respectively. SEM and XRD analysis for the hydrogen-reduced powder mixture showed that the nano-sized W particles were well distributed on the surface of the micro-sized W powders.

Camphor-Naphthalene 동결제 조성이 Cu-Ni 다공체의 기공구조에 미치는 영향

권나연,석명진,오승탁,Kwon, Na-Yeon,Suk, Myung-Jin,Oh, Sung-Tag 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.5

The effect of sublimable vehicle composition in the camphor-naphthalene system on the pore structure of porous Cu-Ni alloy is investigated. The CuO-NiO mixed slurries with hypoeutectic, eutectic and hypereutectic compositions are frozen into a mold at $-25^{\circ}C$. Pores are generated by sublimation of the vehicles at room temperature. After hydrogen reduction at $300^{\circ}C$ and sintering at $850^{\circ}C$ for 1 h, the green body of CuO-NiO is completely converted to porous Cu-Ni alloy with various pore structures. The sintered samples show large pores which are aligned parallel to the sublimable vehicle growth direction. The pore size and porosity decrease with increase in powder content due to the degree of powder rearrangement in slurry. In the hypoeutectic composition slurry, small pores with dendritic morphology are observed in the sintered Cu-Ni, whereas the specimen of hypereutectic composition shows pore structure of plate shape. The change of pore structure is explained by growth behavior of primary camphor and naphthalene crystals during solidification of camphor-naphthalene alloys.

1P-572 보리순 유래 항산화 추출물 미립자 제조를 위한초임계 유체 정제/건조 공정 연구

권나연,김은진,김종원,홍진희,임교빈,유종훈 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

보리순에는 강력한 항산화 효능을 갖는 플라보노이드계(flavonoid) 항산화 성분들이 함유되어 있으며, 이러한 유효성분들을 효율적으로 추출하기 위해서는 극성 유기용매 추출법을 사용해야 한다. 널리 사용되고 있는 수용성 알코올 추출의 경우 복잡한 혼합물 형태로 유효성분이 추출되어 순도가 낮고, 추출물 내 잔류 유기용매가 존재할 수 있어 식품, 의약품 및 화장품 분야에 바로 사용할 수 없다. 따라서 추출된 유효성분의 제품화를 위해서는 분리-정제-건조 등의 추가적인 공정이 요구되어 생산 비용이 증가하게 된다. 이러한 문제점을 해결할 수 있는 환경친화적 방법으로 초임계 이산화탄소를 이용한 공정이 연구되고 있으나, 초임계 이산화탄소의 경우 물과의 친화력이 매우 낮아 물을 포함하고 있는 용액을 건조할 수 없다. 본 연구에서는 일반적인 초임계 유체 공정의 단점을 극복하기 위해 수용성 알코올을 이용해 얻은 보리순 추출 용액에 공용매로 변형된 초임계 유체 정제/건조 공정을 적용하여 클로로필 등의 색소를 제거하는 동시에 잔류 용매 없이 항산화 추출물을 미립자 형태로 제조하였다.

Crosslinkable Conjugated Donor and Acceptor Polymers Bearing Vinyl Moieties in the Side-Chain for Improving the Stability of All-Polymer Solar Cellsall-polymer Solar Cell

권나연,박수홍,김영언,Hong Diem Chau,조승욱,조민주,최동훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

All-polymer solar cells(all-PSCs) have recently been designed and synthesized because of their advantages such as their film-forming properties and the mechanical stability of their active layers. However, even well-mixed polymer blend films can cause phase separation when placed in high temperature environment for a long time. To improve these problems, crosslinkable polymer blend system have been studied recently. In this study, random terpolymers, PBDBT-BV20 and N2200-TV10, were successfully synthesized by introducing vinyl functional groups in the side-chain. In addition, the power conversion efficiency (PCE) of polymer solar cells (PSCs) containing the crosslinked blend films recorded 5.12%. As was expected, the PSCs with the crosslinked blend film displayed excellent shelf-life over 52 days and thermal stability of the PCE. It also showed excellent mechanical stability in flexible PSCs using plastic substrates, resulting in outstanding sustainability of PCEs under bending stress.

아동기 대략적 수 민감도가 비-상징적 곱셈 추론에 미치는 영향

권나연,김제중,김소연 한국인지및생물심리학회 2018 한국심리학회지 인지 및 생물 Vol.30 No.3

Approximate Number Sense (ANS) is an intrinsic intuition and innate cognitive function. It helps children to roughly determine if a quantity is larger or smaller than another. In the current study, we examined relative roles of ANS and intelligence on early arithmetic development in children aged 4-6. Our purpose was 1) to examine whether children aged 4-6 can solve non-symbolic multiplication problems and 2) to examine effects of ANS on early arithmetic development after controlling out effects of intellectual ability. Twenty one young children (4-6 years old) performed non-symbolic multiplication tasks (i..e, multiplication 2 and 4) and a ANS task. Results showed that children as young as 4 years old can solve both non-symbolic multiplication problems above chance level. Also, we found that the efficiency of ANS measured by ANS RTs played a critical role for non-symbolic multiplication 2 task performance even after controlling out effects of IQ. Overall, we conclude that preschoolers as young as 4 years old who don't have prior learning experience of multiplication problems can solve non-symbolic multiplication problems, which might be explained by children's ANS functions. 대략적 수 민감도(Approximate Number Sense; ANS)는 대략적으로 수량이 많은 지, 적은 지를 파악하는 능력이다. 본 연구에서는 21명의 만 4-6세 아동을 대상으로 비-상징적 곱셈 추론 문제를 해결하는 능력을 검증하고, 아동의 ANS와 지능, 그리고 비-상징적 곱셈 추론 능력 간의 관계를 살펴보았다. 이를 통해 1) 만 4-6세 아동들이 비-상징적으로 제시되는 곱셈 문제를 해결 할 수 있는 지를 알아보고자 하였으며, 2) 아동의 지능을 통제하고도 ANS가 초기 산술 능력을 유의미하게 설명할 수 있는지를 검증해보고자 하였다. 그 결과 만 4-6세 아동들은 비-상징적으로 제시되는 곱하기 2 조건과 곱하기 4 조건 모두에서 우연 수준보다 유의미하게 높은 수행률을 보였으며, 이는 곱셈에 대한 정규 교육을 받지 않은 어린 아동의 경우에도 비-상징적인 곱셈의 추론이 가능함을 시사한다. 또한, 비-상징적 곱셈 추론 정확도, 대략적 수 민감도의 정확도와 반응시간, 그리고 전체지능(FSIQ) 간의 관계를 살펴본 결과, 곱하기 2 추론 정확도는 ANS 과제에서의 반응시간과 유의미한 부적상관을 보였으며 이러한 결과는 아동의 지능을 통제하였을 때에도 유의하였다. 즉, 곱하기 2 추론의 경우, 만 4-6세 아동이 ANS 과제에서 더 빠르게 반응할수록 비-상징적 곱셈 추론의 정확도가 높았으며, 이러한 관계는 아동의 지능과 관계없이 나타났다. 그러나 곱하기 4 추론 정확도와 ANS, 그리고 지능 간의 관계는 유의미하지 않았다. 본 연구의 결과는 비-상징적 곱셈 추론 능력이 최소 만 4세 연령에서도 가능함을 시사하며, 아동의 ANS가 비-상징적 곱셈 추론 능력을 설명할 수 있음을 시사한다.