[정시우의 이달에 만난 사람] 그의 변화도, 그날의 광장도 현재진행형 : 영화감독 장준환

정시우,주민욱(사진) 메이데이 2018 Paper Vol.248 No.-

[정시우의 이달에 만난 사람] 작고, 크고, 느리고, 다이내믹한 삶의 변화들 : 뮤지션 루시드폴

정시우 메이데이 2017 Paper Vol.247 No.-

[PAPER 십만원 문화상] 올해의 영화인 정가영〈밤치기〉- 유쾌하지만 결코 가볍지 않은 새로운 출현

정시우 메이데이 2018 Paper Vol.251 No.-

콘칼로리미터 실험데이터 기반 BIPV 적용 도서관의 화재 및 피난 시뮬레이션 연구

정시우,박희경,이민철 한국화재소방학회 2024 한국화재소방학회논문지 Vol.38 No.2

태양광 전지의 기능을 갖출 뿐만 아니라 건축물 외장재의 역할도 하는 건물일체형 태양광(building integratedphotovoltaic, BIPV) 시스템에 사용되는 구성요소들 중 일부는 가연성 재질로 되어 있어 화재 위험성 평가가 필요하다. 본 연구에서는 PyroSim프로그램을 이용한 화재 시뮬레이션을 통해 BIPV 설치 전 후의 화재 위험성을 비교하였 ⋅다. 시뮬레이션에 앞서, BIPV 시스템 패널의 콘칼로리미터 실험을 통해 BIPV 연소특성 데이터베이스를 구축하고,이 실험값을 이용하여 화재 시뮬레이션을 구동시켜 결과를 분석하였다. 화재위험성 평가를 진행한 결과 BIPV 설치하였을 때 수직확산으로 인한 화재전파가 빠르며 열 및 연기방출량이 증가하여, BIPV 설치 전 대비 건물중앙부의기준으로 화재발생 후 805 s에 가시거리가 54.94% 감소하는 등 화재 위험성이 증가하는 것을 확인하였다. 본 연구의결과는 BIPV 설치 건물 내 사람들의 피난 및 수동조치의 신뢰성을 확보하고 화재 안전성 증진하는데 기여할 수 있을 것으로 기대된다. A building integrated photovoltaic (BIPV) system can function as a solar cell and as a building exterior material. Assome of its components are made of combustible materials, it is necessary to evaluate the risk of fire. In this study, therisk of fire before and after BIPV installation was compared through fire simulation using the PyroSim program. Prior tothe simulation, a BIPV combustion characteristic database was established via a cone calorimeter experiment with a BIPVsystem panel, and the results were analyzed through a fire simulation using these experimental values as input values. Thefire risk evaluation confirmed that when BIPV was installed, the fire propagation due to vertical diffusion was fast. Additionally, the amount of heat and smoke emitted increased, resulting in an increase in the risk of fire by 54.94% basedon the center of the building at 805 s. Therefore, it is expected that the results of this study will contribute to securingthe reliability of evacuation and manual measures for people in BIPV-installed buildings as well as improve fire safety.

2D CNN 기반 XR 사용자 뇌파 인증 및 BCI Illiteracy 자동 분류 프로토콜 개발

정시우,채민성,김예니,박상인,하지현,배다환,천성현,문성철 한국방송∙미디어공학회 2023 방송공학회논문지 Vol.28 No.5

This study proposed a protocol for simultaneous user authentication and Brain-Computer Interface (BCI) illiteracy detection in eXtended Reality (XR) environments. Selective participant focus was induced by using periodic visual stimuli incorporating target stimulus images. Event-Related Potential (ERP) was utilized for user authentication, while Steady-State Evoked Potential (SSVEP) was utilized to identify BCI illiteracy. Experimental results revealed that the 10 Hz grow/shrink alphabet image stimulus was the most effective, achieving a 99% accuracy in user classification. Therefore, the proposed protocol can be applied to establish a user authentication and BCI illiteracy detection system in XR environments. These findings are expected to serve as a significant foundation for the development of Universal Neural Interface in XR environments.

Is Mediolateral Head Motion during the Seated Hip Flexion Test and Indoor Cycling Test Associated with Core Stability?

정시우,박규남 KEMA학회 2022 근골격계과학기술학회 Vol.6 No.2

Background Appropriate evaluation of core stability is needed to efficiently evaluate the rehabilitative effectiveness of various training programs. Symmetry in mediolateral head motion during the cycling test depends on the core stability status. The seated hip flexion test requires one of the cycling motions. Purpose The aim of this study was to investigate whether symmetry in mediolateral head motion during the seated hip flexion and cycling tests depends on core stability. Study design A cross-sectional study Methods A total of 75 subjects with poor (n=27) or good (n=48) core stability participated in the study. We measured the symmetry in mediolateral head angle during seated hip flexion and cycling tests, and then compared the results between individuals with good and poor core stability. Results There was no significant difference in head motion symmetry during the seated hip flexion test, although the poor core stability group showed greater asymmetry during the cycling test. Conclusions Our findings imply that the indoor cycling test can be used to estimate core stability; however, the seated hip flexion test is not appropriate for evaluating core stability. Proper resistance to lower extremity movements is needed to invoke core stability-dependent head motion in the frontal plane, considering the differences between the seated hip flexion and cycling tests.

규범윤리학으로서의 덕윤리 : 허스트하우스(Hursthouse)의 견해를 중심으로

정시우 ( Jeong Si-woo ) 경상대학교 교육연구원 2023 현대교육연구 Vol.35 No.2

본 연구의 목적은 의무론자, 공리주의자가 덕윤리에 제시하는 비판에 대해 허스트하우스가 펼친 설득력 있는 주장을 검토하고자 한다. 세부적으로는 ‘덕윤리는 옳은 행위에 대한 지침을 제시하지 못하는가?’, ‘덕윤리는 도덕적 갈등을 해결할 수 없는가?’, ‘덕윤리는 딜레마를 해결할 수 없는가?’에 대해 살펴볼 것이다. 이 세 가지 세부주제를 살피기에 앞서 허스트하우스가 논의하고 있는바가 무엇인가를 짚어보기 위해 ‘규범윤리학이란 무엇인가?’, ‘덕윤리학은 무엇인가?’에 대해 간략히 살펴본 후 덕윤리학이 규범윤리학으로 충분히 기능하는지를 옳은 행위에 대한 허스트하우스의 글과 함께 살펴보고자 한다. The purpose of this study is to examine the persuasive arguments made by Hursthouse in response to the criticisms presented to virtue ethics by deontologists and utilitarians. In detail, we will look at ‘Can’t virtue ethics provide guidelines for right behavior?’, ‘Can’t virtue ethics resolve moral conflicts?’, and ‘Can’t virtue ethics resolve dilemmas?’ Before looking at these three detailed topics, we will briefly look at 'What is normative ethics?' and 'What is virtue ethics?' to see what Hursthouse is discussing. Afterwards, we will discuss virtue ethics as normative ethics. Let's look at whether it functions sufficiently along with Hursthouse's writings on right behavior.

공감능력 상실 시대의 문학과 문학교육

정시우 ( Si-woo Jeong ) 청람어문교육학회(구 청람어문학회) 2016 청람어문교육 Vol.58 No.-

본고는 지금의 시대가 공감능력을 상실한 시대라고 보고 이러한 시대의 문학과 문학교육의 관계를 살펴보고자 하였다. 우리 문학은 의사소통의 부재에서 오는 공감능력 상실의 시기마다 수신되지 않는 발신자들을 위한 공감 기반의 대리 발신을 하였다. 이러한 측면에서 문학은 스스로가 지니고 있는 공감능력을 증명하였다고 할 수 있다. 그러나 문학교육은 표면적으로는 공감능력 신장을 지향하면서도 그러한 모습을 보여주지 못하였다. 이와 같은 상황은 국어과가 기본적으로 도구 교과임에도 불구하고 문학 과목을 지나치게 내용 과목처럼 여기는 문제, 교과서 구성 문제, 국어과 시수 부족 문제, 평가 문제 등에서 비롯되었다고 할 수 있다. 이를 위해 역사적으로 사건의 순간마다 문학이 그 스스로의 공감능력을 증명하여 새로운 존재 방식을 선택하는 것처럼 문학교육도 공감능력을 보다 최우선의 지향점으로 내세우는 새로운 모습을 보여주어야 한다. This paper judges these days as an empathic ability loss periods and examines the relation between literature and literature education. Literature does a role of agent addresser which based on the empathy for who can not be received. The origin of this situation is that this periods which we live in is a empathic ability loss periods which came from the absence of communication. To overcoming this situation and this periods, literature speaks about other persons story. So, it can be told that in these days, literature proves its own empathic ability. Otherwise, literature education does not prove that, even if literature education aims growth of that ability. This situation occurs from excessive regarding as a content subject about literature subject, composition of the textbook, time shortage, problem of evaluation, etc. So literature education has to show new aspect which imposes the empathic ability like literature proves its own empathic ability as a choice of new way of its exist when historical accident occurs.

Classification Model to Discriminate People with and without Pain in the Lower Back and Lower Limb using Symmetry Data

김시현,정시우,박규남 KEMA학회 2021 근골격계과학기술학회 Vol.5 No.2

Background Multiple factors are associated with lower back and lower limb (LB & LL) pain, such as impaired muscle strength, balance, endurance, and motor control, and altered movement patterns. Symmetry of motion, strength and balance are goals for rehabilitation in patients with LB & LL pain. When classifying patients before or during on- and offline assessment, it is necessary that an easy to use functional test be available for clinicians. Purpose To establish a classification tree model for discriminating people with and without LB & LL pain during walking using symmetry values from side plank endurance test, hip abductor strength test, one-leg standing time tests and walking tests. Study design Cross-sectional study Methods A total of 100 subjects with and without LB & LL pain during walking participated. We measured the side plank endurance time, hip abductor strength and one-leg standing time with eyes open and closed, and the sagittal and frontal head angles at comfortable and fast walking speeds using a wearable wireless earbud sensor and calculated the symmetry index (SI) for each test. Classification and regression tree analysis with 10-fold cross validation was used to develop the classification model. Results The classification tree had 83% accuracy for discriminating people with and without LB & LL pain during walking. The most important factor for classification was the SI of the one-leg standing time with eyes closed; the second-most important factor was the SI of the frontal head angle during fast walking. Conclusions The present classification model can differentiate people with and without LB & LL pain during walking based on symmetry data acquired during functional tests, such as one-leg standing time with the eyes closed and fast walking test using the wearable device. Based on the present results, clinicians can classify patients before and during on- and offline assessments using cutoff values of the SI of the one-leg standing test with eyes closed of 63.88%, and of frontal head motion during a fast-walking test of 63.31%.

복합화력발전소 내 수소연료 저장설비의 안전관리 체계 구축을 위한 Bow-tie 기법을 활용한 반정량적 위험성 평가

박희경,정시우,최유정,이민철 한국안전학회 2024 한국안전학회지 Vol.39 No.2

- Hydrogen has been selected as one of the key technologies for reducing CO2 emissions to achieve carbon neutrality by 2050. However, hydrogen safety issues should be fully guaranteed before the commercial and widespread utilization of hydrogen. Here, a bow-tie risk assessment is conducted for the hydrogen fuel supply system in a gas turbine power plant, which can be a mass consumption application of hydrogen. The bow-tie program is utilized for a qualitative risk assessment, allowing the analysis of the causes and consequences according to the stages of accidents. This study proposed an advanced bow-tie method, which includes the barrier criticality matrix and visualized maps of quantitative risk reduction. It is based on evaluating the importance of numerous barriers for the extent of their impact. In addition, it emphasizes the prioritization and concentrated management of high-importance barriers. The radar chart of a bow tie allows the visual comparison of risk levels before/after the application of barriers (safety measures). The risk reduction methods are semi-quantitatively analyzed utilizing the criticality matrix and radar chart, and risk factors from multiple aspects are derived. For establishing a secure hydrogen fuel storage system, the improvements suggested by the bow-tie risk assessment results, such as ‘Ergonomic equipment design to prevent human error’ and ‘Emergency shutdown system,’ will enhance the safety level. It attempts to contribute to the development and enhancement of an efficient safety management system by suggesting a method of calculating the importance of barriers based on the bow-tie risk assessment.