파워 필름 부착과 인장축 방향 변화에 따른 스포츠웨어용 트리코의 인장특성

최지영,홍경희,Choi, Jiyoung,Hong, Kyunghi 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4

For the optimum performance of compression sportswear, tensile properties of base tricot and power film should be understood in the viewpoint regarding the use condition. However, it is difficult to predict the tensile properties of film-welded tricot, solely from the tensile information of the single layer of tricot or power film itself, especially when the direction of the power film does not follow the wale or course direction of the tricot, which often occurs in the actual design of performance sportswear. In this study, changes in the tensile properties of tricot, power film and film-welded tricot were investigated as the angle of tensile axis and the direction of welding varies from$0^{\circ}$ to $90^{\circ}$. Stress, initial modulus, and tensile energy were obtained up to 33~50% of the extension level, which is often observed in actual use. Results indicate that the area of power film matched to the tensile axis and width of power exertion is the key factor of tensile properties explaining stress, initial modulus and energy required during extension. Moreover, the results obtained in this study can be utilized in the arrangement of pattern piece for tricot and the positioning of power film to achieve the right support and extension level during body movement.

정성적 분석을 이용한 실록호우사상의 평가

최지영,박민규,Choi. Jiyoung,Park. Minkyu 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5

본 연구에서는 조선왕조실록을 중심으로 조선시대의 호우 및 홍수기록의 기술방법에 대해 정성적인 검토를 실시하였다. 조선왕조실록은 조선시대의 큰 호우사상은 모두 포함하고 있기 때문에 이를 일정한 등급으로 나누어 분류한다면 극치 호우사상의 발생특성을 이해하는데 도움이 될 수 있다. 조선왕조실록의 기사를 분류하기 위하여 호우나 홍수에 관한 용어, 관련 기사의 회수, 피해규모, 정부의 대처방식 등과 관련한 용례를 검토하여 상대적으로 이를 구분할 수 있는 기준을 수립하였다. 이를 통해 조선왕조실록에 수록된 주요호우사상 중 피해규모가 큰 홍수를 유발한 경우를 규모별로 상상, 상중, 상하로 구분하였다. 그 결과를 살펴보면 전국적인 측면에서 상상급 호우사상은 약 30년에 1회, 상중급 호우사상은 약 5년에 1회 그리고 상하급 호우사상은 2~3년에 1회 정도로 발생하는 것으로 조사되었다. 물론 이러한 재현기간은 전국적인 발생기간 특성이기 때문에 현대적인 개념의 한 지점에서의 재현기간처럼 고려하려 한다면 보다 큰 값을 가지게 될 것이다. In this study, A qualitative review on recording technology to the heavy rains and floods in Annals of the Joseon Dynasty was conducted. Annals of the Joseon Dynasty that includes all of the big storm in the Joseon Dynasty era, so it could be viewed as divided into a certain category, this will help to understand the nature such as the occurrence of extreme rain. The review was done concerning the recording usage such as the rainfall or flood terminology, the frequency of the article, the damage scale, the response of the government, so it set the standard to classify big rainfall events. Classification results shows that extremely big rain was estimated to occur around one in 30 years, big rain about one in five years and slightly big rain about one in two ~ three years. This return period was based on nation-wide scale, so this value which converted to the return period of a single location has the greater value. The classified extremely big rainfall events were compared with observed rainfall from Cheukwoogi(rainfall measuring device), the relationship between the recorded flood damage and the causing extremely big rain was explored.

도시공원 일몰제에 의한 탄소고정량과 경제성 분석에 대한 연구

최지영,이상돈,Choi, Jiyoung,Lee, Sangdon 응용생태공학회 2020 Ecology and resilient infrastructure Vol.7 No.2

In accordance with the implementation of the sunset provision to cancel the designations of urban park sites that remained unexecuted for a prolonged period until 2020, the park sites in the city center, which account for 90% of the long-term unexecuted urban facilities subjected to the provision, are currently on the verge of development. The total area of the 204 park sites that will disappear in Seoul as a result of this provision is 95 ㎢; moreover, 116 of these are privately-owned. It is expected that the possible changes in the use of these park sites could result in reckless development and reduction of green space, which would ultimately affect the ecosystem. This study applied the InVEST model to calculate the changes in the fixed carbon amount before and after the implementation of the sunset provision to estimate the economic value of these changes. The study focused on Jongno-gu in Seoul because it has the most unexecuted park sites subjected to the lifting of the designation. The research findings show that the fixed carbon amount provided by the unexecuted park sites in Jongno-gu was 374,448 mg, prior to the implementation of the sunset provision; however, the amount was estimated to decrease by 18% to 305,564 mg after its execution. When calculated in terms of average value of the real carbon price, this translated into a loss of approximately 700 million won. In addition, considering the social costs including both climate change and the impact on the ecosystem, an economic loss of approximately 98 billion won was projected. This study is meaningful because its predictions are based on the estimation of fixed carbon amount according to the implementation of the sunset provision in Jongno-gu and scientifically calculates the value of ecological services provided by the parks in the city. This study can serve not only as a basis during the decision-making process for policies related to ecosystem conservation and development, but also as an evidentiary material for the compensation of privately-owned land that is designated as urban park sites and was unexecuted for a prolonged period.

최근 북한의 인구구조 평가

최지영(Choi, Jiyoung) 북한대학원대학교 2017 현대북한연구 Vol.20 No.1

대학생의 청소년기 사이버 괴롭힘 피해경험에 관한 사례연구

최지영(Jiyoung Choi),이민혜(Min-Hye Lee) 한국인간발달학회 2019 人間發達硏究 Vol.26 No.2

이 연구의 목적은 대학생을 대상으로 그들이 청소년시기에 경험했던 사이버 공간에서의 피해경험의 특징을 탐색하는 것이다. 연구목적을 달성하기 위해 청소년시기에 사이버 공간에서 괴롭힘을 당했던 경험이 있는 대학생 12명을 연구참여자로 선정하여 심층면담을 실시하였다. 심층면담의 자료는 연속적 비교법과 개방형 코딩법을 활용하여 분석하였다. 분석결과 30개의 개념, 9개의 하위범주, 4개의 범주가 도출되었다. 최종적으로 도출된 4개의 범주는 ‘괴롭힘의 돌림노래’, ‘게임 속 그와 메신저 속 그녀’, ‘사이버 괴롭힘 대처과정에서의 지원군’, ‘초스피드 정서전달자인 스마트폰’ 이다. 첫 번째 범주인 ‘괴롭힘의 돌림노래’는 현실에서의 따돌림과 사이버 상에서의 괴롭힘 경험이 이어지는 것이다. 두 번째 범주인 ‘게임 속 그와 메신저 속 그녀’는 사이버 괴롭힘에서의 성차를 반영한 범주이다. 남학생들은 주로 게임 상황에서 언어적, 관계적 괴롭힘에 시달리는 경험을 하는 반면, 여학생들은 주로 스마트폰이나 컴퓨터 메신저 및 미니홈피에서 자신이 소외되는 경험을 하게 된다. 세 번째 범주인 ‘사이버 괴롭힘 대처과정에서의 지원군’은 스스로 자신을 존중하며 자신의 잘못이 아니라고 인식하는 것과 부모와 가족의 지지와 격려로 인해 사이버 괴롭힘 피해경험을 극복하는 것이다. 넷째, ‘초스피드 정서전달자인 스마트폰’은 스마트폰의 대중화가 사이버 공간에서의 괴롭힘 행동을 포함한 또래관계에 미치는 영향과 관련된 것이다. 마지막으로 이러한 결과를 바탕으로 사이버 괴롭힘 예방을 위한 교육적 시사점을 제시하였다. The purpose of this study is to explore the characteristics of victim experiences in cyber-space as experienced during adolescence. To do this, twelve college students who had experienced bullying in cyber-space during their adolescence were selected as research participants and in-depth interviews were conducted with them. The data derived from the in-depth interviews were analyzed using a continuous comparison method and an open coding method. In the analysis, 30 concepts, nine subcategories, and four categories were established. The four categories are ‘vicious cycle of bullying’, ‘him in the game vs. her in the messenger’, ‘supporters during the process of coping with cyber-bullying’, and ‘smartphone as a speedy emotional transporter’. The first category, ‘vicious cycle of bullying’, refers connection between offline bullying and bullying in cyberspace. The second category, ‘him in the game vs. her in the messenger’, reflects gender differences in cyber-bullying. While boys primarily experience verbal and relational bullying in game situations, girls often experience their own alienation on smartphones, computer messenger applications, and on mini-homepages. The third category, ‘supporters during the process of coping with cyber-bullying’, is related to how the students respect themselves and recognize that they are not to blame, as well as to overcome the cyber-bullying experiences with support and encouragement from parents and other family members. Fourth, ‘smartphone as a speedy emotional transporter’ is related to the influence of the popularization of smartphones on peer relationships, including cyber-bullying behavior. Based on the results of this study, educational implications for cyber-bullying prevention are suggested.

독일통일을 통해 본 남북한 인구통합 전망

최지영 ( Choi-jiyoung ) 북한연구학회 2020 北韓硏究學會報 Vol.24 No.2

This study introduces various scenarios of changes in fertility rates and life expectancy of North Korea after Korean reunification, and compares the development of population aging by scenario based on demographic projections calculated by the cohort component method. These scenarios are set up in consideration of the demographic changes in Germany, observed after its Reunification: the fertility rate of East Germany dropped by half right after unification; and its life expectancy converged to the level of West Germany. Therefore, the fertility shock and the convergence of life expectancy are reflected in the scenarios of North Korean population after unification. Besides, this study assumes a scenario where the fertility rate of the North could increase due to an improvement in child-care environment and public health, considering the distinct features of the inter-Korean unification. The main finding of this study is as follows. The population integration of the two Koreas may alleviate the burden of population aging of South Korea. This positive impact, however, may be gradually reduced if the North’s fertility rate sharply drops and life expectancy converges to the level of the South. Yet, the level of population aging may be continuously reduced in case the fertility rate of the North raises even though its life expectancy converges to the level of the South.

모바일 매니퓰레이터를 이용한 가변형 선형 객체의 모델 예측 제어

최지영(Jiyoung Choi),홍아영(Ayoung Hong) 대한기계학회 2024 대한기계학회 춘추학술대회 Vol.2024 No.4

시진핑 시기 ‘시파이(習派)’의 형성과 정치적 함의

최지영(Choi, Jiyoung) 21세기정치학회 2018 21세기 정치학회보 Vol.28 No.4

고분자전해질형 연료전지의 공기 채널 내에서의 액적 거동에 대한 수치적 연구

최지영(Jiyoung Choi),손기헌(Gihun Son) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

The water droplet motion in an air flow microchannel with pores through which water emerges is studied numerically by solving the equations governing the conservation of mass and momentum. The gas-liquid interface is tracked by a level set method which is based on a sharp-interface representation for accurately imposing the matching conditions at the interface and is modified to implement the contact angle conditions on the wall and pores. The numerical results show that the droplet growth and detachment pattern depend significantly on the contact angle and inlet air velocity. Also, the dynamic interaction between the droplets growing on multiple pores is investigated. The pore arrangement subject to droplet merging is found to be not effective for water removal.

재한(在韓) 중국 유학생의 한국에 대한 의식과 민족주의 성향 연구

최지영(Jiyoung CHOI) 한국국제정치학회 2011 國際政治論叢 Vol.51 No.1