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범죄 용의자의 거짓말탐지검사의 신뢰도와 타당도에 대한 일관성 채점기준의 효과
한유화 ( Yu Hwa Han ),정재영 ( Je Young Jeong ),박광배 ( Kwang Bai Park ) 한국감성과학회 2009 감성과학 Vol.12 No.4
For scoring polygraph charts, the Prosecutors` Office of the Republic of Korea uses a consistency criterion in which an elevated signal on one physiological channel is scored as a deceptive response only if the signal is also elevated on other channels. In the current study, the effects of this scoring criterion on reliability and accuracy (validity) of polygraph scores were assessed. Polygraph tests on 26 suspects were evaluated twice by the same examiners. The examiners used the consistency criterion in the first evaluation. In the second evaluation, the examiners were prevented from using the criterion; the signals from each physiological channel were separated and randomly arranged before they were rescored by the same examiner. Reliability was assessed by the variation among the scores for each suspect. Accuracy was assessed by establishing a standard, based on a Latent Class Analysis model, using the results of polygraph tests on each of 182 additional suspects. Reliability and accuracy were both improved by the use of the consistency criterion which therefore was recommended.
기억에 대한 오정보의 영향: 숨긴정보검사를 이용한 원기억의 탐지
한유화 ( Yu Hwa Han ),박광배 ( Kwang Bai Park ) 한국감성과학회 2015 감성과학 Vol.18 No.2
This study aimed at examining if the original memory remains after a misinformation is presented, using Event- Related Potential based Concealed Information Test (ERP-based CIT). In the first stage of the study, the participant was presented with either the original information or a misleading information after experiencing an event (Post-information). The second stage was to measure brain wave and reaction time on the original, misleading, and irrelevant information (CIT-Stimulus). P300 amplitude, P300 area, P300 latency, and reaction time were used as dependant variables. In the result, a significant Post-information .CIT-Stimulus interaction effect was found on the P300 area measured at Cz, Pz, and Oz area. This interaction effect implied the possibility that the original information could be partially impaired in memory by misleading information presented afterward. P300 amplitude at Pz area did not differ between the accurate and the misleading stimuli in the condition in which a misleading information was presented. This result can be explained by source monitoring error. In discussion, the limitations of this study and directions of future studies were discussed.
한유화 ( Han Yu Hwa ),이미선 ( Yi Mi Sun ) 한국경찰학회 2023 한국경찰학회보 Vol.25 No.6
This study confirmed the current status of the expert testimony system in the police and the use of the expert report in investigations and trials of sexual abuse cases involving child victims with intellectual disabilities. To achieve this, police statistics on experts and related judgements in child sexual assault cases from 2014-2022 were analysed. The results showed that there is currently an average of four experts belong to each of the 17 city police forces. The average number of cases per expert from January to June 2019 was 18. Of the cases where the expert’s opinion was that the victim’s statement was ‘credible’, approximately 70% of the sending opinions were ‘prosecution’. In 14.3% of cases, the content of the opinion was directly quoted (mentioned) in the judgement. The concordance rate between expert opinions and judgements was 91.6%. There is no statistical significance between the characteristics of the victims and the citation of the expert opinion. However, when the defendant was ‘guilty’, the rate of citation of the opinion tended to be slightly higher than when the defendant was ‘not guilty’. Finally, we suggested reforming the format of expert reports and developing a training program to improve the expertise of experts in statement analysis in order to make better use of expert reports.
중학교 과학교과서, 교사의 인식 및 실험 수업 사례에서 나타난 과학적 탐구 요소 분석
한유화 ( Yu Hwa Han ),전은선 ( Eun Sun Jeun ),백성혜 ( Seoung Hye Paik ) 한국과학교육학회 2014 한국과학교육학회지 Vol.34 No.4
이 연구의 목적은 수업시간에 이루어지는 과학 실험의 의미를 고찰하고 실험 수업의 개선 방향을 알아보는 것이다. 이를 위하여 교과서, 교사 인식, 실제 수업 사례를 분석하여 탐구 요소가 과학 실험 수업에 얼마나 포함되어 있으며 그 수준은 어떠한지 알아보았다. 22명의 교사를 대상으로 한 설문지를 통해 교사의 인식을 알아보았으며, 중학교 3학년 2개 학급의 2차시 수업을 분석하였다. 연구 결과, 문제제시, 증거수집, 현상설명 및 기존 과학지식의 연결은 대부분의 교과서에서 제시되었으나, 의사소통 및 정당화 요소는 많지 않았다. 또한 제시된 수준은 주로 교사 주도적이었다. 교사들은 의사소통 및 정당화 단계가 매우 중요하다고 생각하였으나, 실제 실험 수업에 이를 반영하지는 못하는 것으로 나타났다. 실제 실험 수업에서 학생들은 시간의 대부분을 증거수집에 할애하였으며, 실험 결과인 증거를 기반으로 현상을 설명하거나 기존 지식과 연결하는 활동, 그리고 의사소통 및 정당화의 활동은 거의 하지 못하였다. The purpose of this study is to consider the implications of science experiment in class and to seek a direction for its improvement. For this purpose, Science textbooks, teachers` cognitions, and classroom activities have been analyzed to find out how many and what kind of levels of inquiry elements are included in those. In this study, 22 teachers have participated in the questionnaire to investigate their perception about experiment class, and the two instruction cases in two classes of 9th grade have also been analyzed. Results show that most of the textbooks have included questioning, evidence collecting, explanation of phenomena, and connection with existing scientific knowledge. But the elements of communication and justification have been few. Most levels of the inquiry are teacher-led. Although the teachers thought communication and justification are important, their classroom activities does not coalesce with their thoughts. The students mostly spend their time with connecting evidence, they hardly explain the phenomenon based on the proofs as the results of experiment, and the activities of connection with the existing scientific knowledge, and communication and justification.
한두석(Du Seok Han),한종현(Jong Hyun Han),유화(Hwa Yu),김지주(Ji Ju Kim),강길웅(Kil Ung Kang),백승화(Seung Hwa Baek) 대한약학회 1999 약학회지 Vol.43 No.2
In the present study, we have evaluated cytotoxic effects, antitumor activities and metastasis inhibitory effects of Palsun brewing water NIH 3T3 cells, human oral epitheloid carcinoma cells, and human skin melanoma cells. The light microscopic study showed morphological changes, AG-NOR (argyrophylic nucleolar organizer region) by silver chloride stain, and glycoprotein by PAS (periodic acid stain) reaction of the treated cells. Disruptions in cell organelles were deteminied by colorimetric methods;MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazoliumbromide) and SRB (sulforhodamine B protein) assays. These results suggest that Palsun Brewing Water retains no cytotoxic effects in NIH 3T3 cells and a growth-inhibitory activity in cancer cell lines.
Yu, Jae Keun,Cha, Kwang Yong,Seo, Dong Jun,Han, Joung Su,Jang, Jae Bum,Lee, Yong Hwa,Kim, Dong Hee Materials Research Society of Korea 2014 한국재료학회지 Vol.24 No.6
Using the spray pyrolysis process, nano-sized cobalt oxide powder with average particle size below 50 nm was prepared from cobalt chloride solution. The influences of the raw material solution on the properties of the powder formed examined. When the concentration of Co was low(20 g/L), the average particle size of the powder formed was roughly 20 nm, and the cohesion between these particles was significantly strong. When the concentration of Co increased to 100 g/L, the droplets nearly failed to exist in circular form and reflected a severely divided form. Furthermore, the average size of the particles formed was roughly 40 nm, and the particles reflected a polygonal form. When the solution was increased to nearly saturation level (Co at 200 g/L), the particle size distribution reflected significant unevenness due to severe droplet division while the surface also reflected significant unevenness. Furthermore, the average size of the particles formed increased significantly to 70 nm. The results of XRD analysis showed that the strength of the peaks reflected very little change when the concentration of Co was increased from 20 g/L to 50 g/L. Alternatively, when the concentration was increased to 100 g/L, the strength of the peaks increased compared to when the concentration was 50 g/L. However, when the concentration was increased to 200 g/L, the strength of the peaks failed to reflect significant change compared to when the concentration was 100 g/L. The specific surface area dramatically decreased by 30 % when the concentration of Co was increased from 20 g/L to 50 g/L. Alternatively, when the concentration of Co the solution increased to 100 g/L, the specific surface area decreased by roughly 15 %. Furthermore, when the concentration of Co was increased to nearly saturation level(200 g/L), the specific surface area decreased by roughly 35%.