공중화장실 VR체험을 통한 범죄두려움 요소 도출

차유정,송정화 한국셉테드학회 2023 한국셉테드학회지 Vol.14 No.2

Recently, many women in Korea are afraid of violent crimes and sex crimes in public toilets. The purpose of this study is to specifically and empirically identify the fear of crime factors that can be felt in public toilets. In this study, VR was implemented with actual public toilet elements in order to minimize the risk of actual crime exposure and time and cost problems that could be occurred through field experiences, and fear factors were derived through survey after VR experiment. As a result of this study, respondents were found to have fears about the location of the toilets, all-gender toilets, the brightness, maintenance, management of the public toilets, and specific fear of crime related to sex crimes were high. In addition, it was confirmed that the evaluation of each VR element showed differences depending on the level of fear felt by the individual. Through these results, we would like to provide implications such as the separation of men and women in public toilets, installing CCTV around the public toilets, and attaching notification statements related to emergency bells.

건강한 한국인 자원자에서 나프토피딜(Naftopidil) 단회 경구투여에 의한 약동학적 특성 및 내약성에 관한 연구

차유정,김정원,전혜원,신광희,이승환,장인진,신상구,유경상 대한임상약리학회 2010 Translational and Clinical Pharmacology Vol.18 No.2

Background: Naftopidil is a selective α₁adrenergic receptor antagonist which is used for the treatment of dysuria caused by benign prostatic hyperplasia. We investigated the pharmacokinetic characteristics and tolerability of naftopidil after a single oral dose in healthy Korean male volunteers. Methods: Sixteen subjects were allocated into two groups (8 for naftopidil 50 mg and 75 mg, 8 for naftopidil 25 mg and 100 mg). Serial blood samples for pharmacokinetics were collected up to 24 hours after drug administration. Naftopidil plasma concentrations were determined by HPLC. The pharmacokinetic parameters were calculated by noncompartmental methods. Tolerability assessments including vital signs, 12-lead ECG, clinical laboratory parameters, and adverse events were conducted. Results: The median time of maximum observed plasma concentration (Tmax) was 0.5 h in all dose groups. The maximum plasma concentration (Cmax) of 25, 50, 75 and 100 mg dose group were 44.0 μg/L, 88.9 μg/L, 126.7 μg/L, and 179.5 μg/L, respectively. The area under the concentration-time curve to the last measured concentration over the limit of quantitation (AUClast) of respective dose groups were 71.1 μg*h/L/mg, 178.7 μg*h/L/mg, 316.2 μg*h/L/mg, and 342.6 μg*h/L/mg, respectively. Conclusion: The results of this study indicate that the systemic exposure of naftopidil expressed as AUClast and Cmax was increased dose proportionally, and all doses. Up to 100 mg were well tolerated without serious adverse events in healthy Korean male volunteers.

Na₂Ti₆O₁₃를 도핑한 0.94BaTiO₃-0.06(Bi_0.5Na_0.5)TiO₃ 세라믹스의 미세구조와 Positive Temperature Coefficient of Resistivity 특성

차유정,정영훈,이영진,백종후,이우영,김대준,Cha, Yu-Joung,Jeong, Young-Hun,Lee, Young-Jin,Paik, Jong-Hoo,Lee, Wu-Young,Kim, Dae-Joon 한국재료학회 2010 한국재료학회지 Vol.20 No.11

The microstructure and positive temperature coefficient of resistivity (PTCR) characteristics of 0.1 mol%$Na_2Ti_6O_{13}$ doped $0.94BaTiO_3-0.06(Bi_{0.5}Na_{0.5})TiO_3$ (BBNT-NT001) ceramics sintered at various temperatures from $1200^{\circ}C$ to $1350^{\circ}C$ were investigated in order to develop eco-friendly PTCR thermistors with a high Curie temperature ($T_C$). Resulting thermistors showed a perovskite structure with a tetragonal symmetry. When sintered at $1200^{\circ}C$, the specimen had a uniform microstructure with small grains. However, abnormally grown grains started to appear at $1250^{\circ}C$ and a homogeneous microstructure with large grains was exhibited when the sintering temperature reached $1325^{\circ}C$. When the temperature exceeded $1325^{\circ}C$, the grain growth was inhibited due to the numerous nucleation sites generated at the extremely high temperature. It is considered that $Na_2Ti_6O_{13}$ is responsible for the grain growth of the $0.94BaTiO_3-0.06(Bi_{0.5}Na_{0.5})TiO_3$) ceramics by forming a liquid phase during the sintering at around $1300^{\circ}C$. The grain growth of the BBNT-NT001 ceramics was significantly correlated with a decrease of resistivity. All the specimens were observed to have PTCR characteristics except for the sample sintered at $1200^{\circ}C$. The BBNT-NT001 ceramics had significantly decreased $\tilde{n}_{rt}$ and increased resistivity jump with increasing sintering temperature at from $1200^{\circ}C$ to $1325^{\circ}C$. Especially, the BBNT-NT001 ceramics sintered at $1325^{\circ}C$ exhibited superior PTCR characteristics of low resistivity at room temperature ($122\;{\Omega}{\cdot}cm$), high resistivity jump ($1.28{\times}10^4$), high resistivity temperature factor (20.4%/$^{\circ}C$), and a high Tc of $157.9^{\circ}C$.

RF co-sputtering 법을 이용하여 제작된 Ti가 첨가된 In₂O₃ 박막의 광 및 전기적 수송 특성

차유정,황태종,곽진석,김동호,홍태은,김종필 한국물리학회 2012 새물리 Vol.62 No.2

Ti-doped In_2O_3 thin films were prepared by co-sputtering of TiO_2 and In_2O_3 targets on glass substrates at a temperature of 400℃. The sputtering power on the In_2O_3 target was fixed to 30 W while the power on TiO_2 target was varied from 0 to 40 W. The influence of the sputtering power on the TiO_2 target on the structural, electrical, and optical properties of the deposited thin films was investigated. All the films had a polycrystalline nature, but degradation of the crystallinity was observed in films grown at powers higher than 20 W on the TiO_2 target. The average transmittance of the thin films in the wavelength range of 500~1100 nm was over 85 %. A lower resistivity of 2.6 × 10^-4Ω·cm and a higher mobility of 44 ㎠/V·s, compared to the values for pure In_2O_3films,were obtained in Ti-doped I0_2O_3 films. These values are comparable to those of commercial indium tin oxide films, suggesting that Ti-doped In_2O_3 is a good candidate for a transparent conductive thin film. TiO_2 와 In_2O_3 두 개의 타겟을 이용하는 rf co-sputtering 방법으로 400℃에서 유리 기판 위에 Ti가 첨가된 In_2O_3박막을 제작하였다. 이 때 In_2O_3 타겟의 전력은 30 W로 고정하고TiO_2 타겟의 전력을 0 ~ 40 W로 변화시켜 Ti의 상대 농도를조절하였고 이에 따른 박막의 구조, 광 및 전기적 수송특성을조사하였다. 모든 박막에서 다결정 구조가 관측되었으며 TiO$_2$ 타겟의전력이 20 W보다 높아짐에 따라 결정성이 약화되는 현상을 보였다. 모든박막에서 평균 투과율은 500 ~ 1100 nm의 파장 영역에서 85%이상이었고, Ti 첨가로 인해 In_2O_3의 전기전도성이 향상됨이관측되었다. 최소 비저항은 2.6 × 10^-4Ω·cm로순수 In_2O_3 보다 낮았고 최대 홀 이동도는 44 ㎠/V·s로순수 In_2O_3 보다 더 높았다. 이 값들은 상용화된 indium tin oxide와 비슷한 수준이다. 따라서 Ti가 첨가된 In_2O_3박막도투명전도성 박막으로 적합하다고 여겨진다.

전자 자기 공명을 이용한 K2O-B2O3V2O5 반도체 유리계의 구조 연구

차유정,황태종,김기현,김동호,송승기 한국물리학회 2009 새물리 Vol.58 No.2

The structure surrounding the V4+ ion in K2O-B2O3-V2O5 semiconducting glasses has been investigated using electron magnetic resonance (EMR) in the X-band (9.13 GHz) at room temperature for various K2O and V2O5 contents. The parameters, gⅡ, g┴, AⅡ, A┴ of the spin Hamiltonian, the dipolar hyperfine coupling parameter, P, the Fermi contact interaction parameter, K, and the symmetry have been calculated and analyzed for various compositions of the K2O and V2O5. The EMR spectra of K2O-B2O3-V2O5 glasses showed characteristics very similar to those of the hyperfine interaction of the unpaired electron with a 51V nucleus whose spin is 7/2 for various alkali borate glasses containing vanadium. The spectrum of the hyperfine structure decreased with increasing vanadium ratio. The V4+ ions in these samples were found to exist as VO2+ ions in an octahedral coordination with a tetragonal symmetry that belonged to the C4V group. K2O-B2O3-V2O5인 3성분계의 반도체 유리에 내에서 이온의 구조연구를 위해 여러 조성비에서 X-band(9.13GHz)의 EMR (elecron magnetic resonance)을 이용하여 상온에서 연구하였다. K2O 와 V2O5의 조성비의 변화에 따른 스핀 헤밀토니안 파라미터인 gⅡ, g┴, AⅡ, A┴ 와 대칭성 등의 분석을 하였고 실험 공명선은 스핀 7/2 인 51V 핵과 짝짓지 않은 전자와의 상호작용에서 나오는 초미세구조의 선 모양으로 바나듐을 포함한 알칼리-붕소 산화물계 유리에서 볼 수 있는 스펙트럼과 유사하다. 바나듐의 비율이 증가하면서 초미세 구조가 감소하는 경향을 보였고, 이온은 K2O-B2O3-V2O5 시료 내에서 정방대칭을 한 팔면체 VO2+이온으로 존재하며 C4v대칭성을 띄는 것으로 나타났다.

중소형 선박의 SOx/NOx 동시제거를 위한 습식세정시스템

차유정,이주열,하태영,박병현 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.1

In recent years, researchers have put a considerable effort to decrease the emission of harmful gaseous pollutants to the atmosphere. In order to remove simultaneously SO₂ and NOx from the flue gas of small and medium-sized ship, we designed minimal wet scrubber inside a compact multistage modular system. In this study we proceed experiment of elemental technology at each stage of the scrubber. The each stage is oxidation of NO which is the main component of NOx, and removal of SO₂, respectively. NaClO₂ was used to oxidize NO gas, and NaOH was used to remove SO₂gas. The maximum NO conversion efficiency and the SO₂ removal ficiency are both indicate 100%.

공중화장실 범죄 두려움 요소와 CPTED 적용 방안

차유정,송정화 한국셉테드학회 2022 한국셉테드학회지 Vol.13 No.3

This study focuses on identifying the factors affecting fear of crime in public toilets that people may experience through actual crime cases in public toilets and suggesting applicable implications of CPTED. In this study, we examined the number of crimes related to public toilets over the past five years through official crime statistics. In addition, we reviewed specific cases of public toilet crimes through Internet articles and legal precedents. Particularly, through the cases, we examined which specific characteristics of toilets such as the location of men’s and women’s entrances and the absence of emergency bells might have led to crimes. Lastly, we suggested various elements of the fear of crime in public toilets and CPTED application ways.

사회적 차별과 국가안보에 관한 연구: Agnew(2013)의 논의를 바탕으로

차유정,홍명기,장정현 한국테러학회 2020 한국테러학회보 Vol.13 No.1

This Study examined the effects of being discriminated(Objective strain) and cultural adaption stress(Subjective strain) among multicultural adolescents on drugs use and violent delinqeuncy. For this study, 2014, 2015 MAPS data were used. The results shows that Objective strain only significantly influenced Subjective strain. The subjective strain was related positively to negative emotions which were related to violent delinquency not drugs use. In addition, much being bullied by peer groups caused negative emotions and the number of delinquency friends are also related to negative emotions. The number of delinquency friends affect drugs use. As for gender, female felt more negative emotions than male while male used more drugs. Finally, each delinquency were the most strongly related to the previous each delinquency. 본 연구는 우리나라 다문화 가정의 청소년에 대한 사회적 차별과 폭력의 관계를 경험적연구를 통해 검증하고자 하였다. 사회적차별은 국가에 대한 신뢰를 저해하고 나아가 국가안보에 부정적 결과를 초래할 수 있다. 본 연구의 데이터는 한국청소년정책연구원에서 2011년부터 2016년까지 조사한 데이터 중 2014년도와 2015년도의 자료를 사용하였다. 연구결과, 객관적 긴장은 주관적 긴장에만 유의미한 영향을 주며, 주관적 긴장은 부정적 감정에 통계적으로 유의미한 영향을 주었다. 또한, 부정적 감정은 술, 담배의 사용에는 유의미한 영향을 나타내지 않았으나 폭력비행에는 유의미한 영향을 주는 것으로 나타났다. 통제변수로 따돌림을 당한 경험이 많아지면 부정적 감정이 높아지고, 비행친구 수 또한 부정적 감정에 유의미한 영향을 주는 것을 알 수 있었다. 비행친구 수는 술, 담배 사용에 유의한 영향을 주었고 성별의 경우 여성이 더 많이 부정적 감정을 느끼지만 술, 담배의 사용은 남성이 더 많이 하였다. 각 비행의 경우, 가장 영향을 많이 주는 것은 전년도의 각 비행으로 나타났다.

Light Intensity 및 명암비 향상을 위한 마이크로 LED의 사파이어 기판 형상 변화 연구

차유정,곽준섭,Cha, Yu-Jung,Kwak, Joon Seop 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1

Micro-LEDs can be applied to various parts of a product. However, it has disadvantages compared to general LEDs in large displays such as low efficiency, intensity, and contrast ratio, among others, owing to their short history of study. The simulations were carried out using ray-tracing software to investigate the change in light intensity and light distribution according to pattern shapes on the sapphire substrate of the flip-chip micro-LED (FC μ-LED) array. Three patterns-concave square patterns, convex square patterns, and Ag coated convex patterns-which existed on the opposite side of FC μ-LEDs (115 ㎛ × 115 ㎛) array, were applied. The intensity of FC μ-LEDs on the center of the receivers depends on the pattern depth with shape. The concave square patterns having FC μ-LEDs arrays show that decreasing intensity as the patterns depth. On the contrary, the convex square patterns having FC μ-LEDs arrays shows that increasing intensity as the patterns depth. In addition, the highest intensity shows that FC μ-LEDs having Ag-coated convex patterns on the opposite side of sapphire lead to a reduction in light crosstalk owing to the Ag film.

테러발생에 영향을 미치는 국가수준의 요인: 국제 테러자료를 활용한 발달궤적모형을 중심으로

차유정,황의갑 한국테러학회 2017 한국테러학회보 Vol.10 No.4

This study examined the international factors affecting terrorism incidents based on rational choice theory and situational crime prevention theory. The results of group- based trajectory modeling analysis showed some interesting patterns. In the time-varying covariate analysis, GDP had a significant effect on the high- terror nations group. As well, political instability had a significant effect on the increasing-terror nations group. Level of violent crime had a significant effect on the increasing-terror nations group as well as the high-terror nations group. Displaced people index had a significant effect on the low-terror incidents nations group as well as the increasing-terror nations group. Interestingly, accessibility to weapons had a significant effect on the change of later-terror increasing nations group. On the other hand, police index had no significant effect on all trajectory groups. Implications for the policies and future research were discussed based on the results. 본 연구는 전 세계의 국가들을 대상으로 하여 테러 발생여부에 영향을 미치는 요인들에 대하여 합리적 선택이론과 상황적 범죄예방이론을 적용하여 진행하였다. 테러발생에 대하여 테러가 한 번이라도 발생한 나라와 그렇지 않은 경우를 구분하였고, 집단기반 발달궤적 모형(Group-based Trajectory Modeling)의 방법을 사용하여 ‘저테러발생국가집단’, ‘테러발생상승국가집단’, ‘고테러발생국가집단’으로 3개의 가장 최적화 된 집단모형을 도출하여 분석을 진행하였다. Time-varying Covariate 분석을 통하여 그 독립변수가 테러발생에 대한 발달궤적에 영향을 어떻게 미치는 지를 살펴본 결과, GDP의 경우 ‘고테러발생국가집단’에 유의미하게 영향을 미치는 것으로 나타났고, 정치적 불안정성의 경우 ‘테러발생상승국가집단’에 유의미한 영향을 주는 것으로 나타났다. 폭력범죄수준의 경우 ‘테러발생 상승국가집단’과 ‘고테러발생국가집단’에 유의미하게 영향을 주었다. 아울러, 이주민지수는 ‘저테러발생국가집단’과 ‘테러발생상승국가집단’에 대하여 유의미한 영향을 주는 것으로 나타났다. 흥미롭게도, 무기획득용이성의 경우 새롭게 발달궤적이 추정되어 ‘후기테러발생국가집단’에 유의미하게 영향을 주는 것으로 나타났으며, 경찰지수는 어떠한 집단에도 유의미한 영향을 주지 못하였다.