SWAT 모델을 이용한 강우특성 변화에 의한 퇴적물-유출량 간의 관계 평가

김지수,김민석,조용찬,Kim, Jisu,Kim, Minseok,Cho, Youngchan 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.6

The sediment transportation caused by soil erosion due to rainfall-discharge in the large watershed scale plays critical role in human society. The relationship between rainfall-discharge-sediment transportation is depending on the start time of rainfall and end of rainfall but, the studies related with rainfall characteristics are insufficient. In this study, The Soil and Water Assession Tool (SWAT) model was used to study the relationship between rainfall-discharge-sediment transportation at the Sook river watershed which is monitored by the Ministry of Environment. To do this, first of all, the sensitivity analysis about model attributes was performed using monitored data. The accuracy analysis of SWAT model was conducted using the model's efficiency index (Nash and Sutcliffe model efficiency; NSE) and the coefficient of determination (R²). After that, it was studied what results could be obtained according to changes in rainfall timing and end points. In the result of discharge simulation, the modified rainfall values (sum of total rainfall starting time and end time) showed more high accuracy values (R²:0.90, NSE: 0.8) than original rainfall values (R²:0.76, NSE: 0.72). In the result of sediment transportation simulation, during calibration had more resonable results(R²:0.87, NSE: 0.86) than compared with original rainfall values (R²:0.44, NSE: 0.41). However, validation results of sediment transportation simulation showed low accuracy values compared with calibration results. This results maybe cause monitoring periods of sediment flow compared with discharge monitoring periods. Nevertheless, since rainfall characteristic plays critical rule in model results, continuous research on rainfall characteristic is needed.

단열 페인트 첨가제로써 중공형 실리카 나노입자의 크기에 따른 효과

김지수,김영훈,Kim, Jisue,Kim, Younghun 한국청정기술학회 2022 청정기술 Vol.28 No.1

에너지 절약을 위한 연구 중 단열 기술 분야에서는 공기의 낮은 열전도도를 활용한 연구가 이뤄지고 있으며 널리 상용화 되고 있다. 본 연구에서는 입자 내부에 공기층을 갖는 중공형(hollow) 형태의 실리카 나노 입자를 제조하여 공기층 크기가 단열 성능에 미치는 영향에 대해 고찰하였다. Polystyrene 주형법을 이용하여 졸-겔공정을 통해 속이 빈 중공형 실리카 나노 입자(Hollow silica nanoparticles)를 제조하였고, 입자를 5 wt %로 도료에 첨가한 후 열전달 실험을 통해 단열 성능을 확인하였다. 기존 페인트에 입자를 혼합하여 약 15 %이상의 단열효율을 나타냈으며, 내부 공기층의 크기가 큰 입자가 작은 입자에 비해 5% 높은 단열 성능을 나타냈다. 이번 연구를 통해 내부 크기에 따른 단열효과의 차이를 보여줌으로써, 중공형 형태의 입자를 첨가제나 도료 제조에 사용하는 경우 단열효과를 높이기 위해 매질 내에서 입자가 공기층을 최대로 이룰 수 있도록 입자의 크기를 고려해야함을 제시한다.

SWAT model과 기후변화 자료를 이용한 산사태 예측 기법 제안과 평가: 지리산 국립공원 중산리 일대 사례연구

김지수,김민석,조용찬,오현주,이춘오,Kim, Jisu,Kim, Minseok,Cho, Youngchan,Oh, Hyunjoo,Lee, Choonoh 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.6

The purpose of this study is prediction of landslide occurrence reflecting the subsurface flow characteristics within the soil layer in the future due to climate change in a large scale watershed. To do this, we considered the infinite slope stability theory to evaluate the landslide occurrence with predicted soil moisture content by SWAT model based on monitored data (rainfall-soil moisture-discharge). The correlation between the SWAT model and the monitoring data was performed using the coefficient of determination (R²) and the model's efficiency index (Nash and Sutcliffe model efficiency; NSE) and, an accuracy analysis of landslide prediction was performed using auROC (area under Receiver Operating Curve) analysis. In results comparing with the calculated discharge-soil moisture content by SWAT model vs. actual observation data, R² was 0.9 and NSE was 0.91 in discharge and, R² was 0.7 and NSE was 0.79 in soil moisture, respectively. As a result of performing infinite slope stability analysis in the area where landslides occurred in the past based on simulated data (SWAT analysis result of 0.7~0.8), AuROC showed 0.98, indicating that the suggested prediction method was resonable. Based on this, as a result of predicting the characteristics of landslide occurrence by 2050 using climate change scenario (RCP 8.5) data, it was calculated that four landslides could occur with a soil moisture content of more than 75% and rainfall over 250 mm/day during simulation. Although this study needs to be evaluated in various regions because of a case study, it was possible to determine the possibility of prediction through modeling of subsurface flow mechanism, one of the most important attributes in landslide occurrence.

한복과 한푸의 차이점 분석에 관한 연구

김지수,나영주,Kim, Jisu,Na, Youngjoo 대한가정학회 2022 Human Ecology Research(HER) Vol.60 No.2

(K)Hanbok, which is Korea's traditional clothing, differs from the Chinese Hanfu or Japanese Kimono. This study aims to understand the fundamental differences between (K)Hanbok and Hanfu. The Goryeo Dynasty (K)Hanbok, which was particularly popular in China, was established because the Ming Dynasty Hanfu and Chinese fashion were considerably influenced by the 'Koryo Yang'. Firstly, while (K)Hanbok is bulky, Hanfu of the Han Dynasty is characterized by forming a slim silhouette. Due to the climate of the Northern Hemisphere, (K)Hanbok shows a rich silhouette comprising multiple layers of inner pants and a pleated skirt over a voluminous underskirt. On the other hand, the Han's Hanfu creates a straight silhouette in the form of a wrap, revealing the contours of the body. The pleated skirt of the (K)Hanbok can use six to twelve width fabrics, depending on the social position; however, the Hanfu of the Han is a skirt without any pleats. Secondly, the clothing patterns, which have various shapes, are totally different in how they are made and sewn. The Korean (K)Hanbok is a two-piece separate, whereas the Chinese Hanfu style is a one-piece with a skirt. The short length of the (K)Hanbok jacket has a Sup which is cut and pasted allowing the front closure to overlap. Nevertheless, the Hanfu of the Han does not have this Sup because it is of a wrap-around, one-piece style and has an exceptionally large front, and wraps around at the waist which extends to the sides. Thirdly, the (K)Hanbok jacket has separate string Gorums for fastening, and an additional belt around the waist; however, in the case of Gorum, it is unnecessary for a wrapping style of Hanfu. Fourthly, Koreans as an agricultural horse-riding people, basically wore the trousers attached a comfortable gusset, while the Chinese Hanfu had no pants, but the Chinese wore Gaedanggo pants which exposed the hips, inevitably during the Warring States period.

패션 인스타그램 해시태그가 소비자 태도에 미치는 영향

김지수,정다은,조민주,나영주,Kim, Jisu,Jeong, Da Eun,Jo, Minjoo,Na, Youngjoo 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.2

Recently, the number of Instagram users is increasing and the marketing strategy of fashion brands to utilize hashtags (#) is rapidly growing. This study investigates the effects of hashtags in fashion-Instagram on consumer attitudes. The purpose of this study is to investigate the effect of the number, language, and relevance of the hashtags used in fashion-Instagram on the cognitive, emotional, and behavioral factors of consumer attitudes. The results of this study are as follows: First, a lesser number of hashtags has a positive effect on these factors. Second, when the language of the hashtag is English rather than Korean, it has a positive effect on the abovementioned factors. Third, when there is a relationship between the hashtag and the post, the consumers showed significantly more positive attitudes. Therefore, this study can help fashion brands to more effectively utilize hashtags in marketing using Instagram. In addition, this study will likely lead to the development of methods for utilizing hashtags as a more specific means of marketing through future studies.

LED 등기구에 사용되는 도광판 패턴에 따른 광특성 분석 연구

김지수(Jisu Kim),김해규(Haegyu Kim),김재연(Jaeyeon Kim),유소영(Soyoung You),강수빈(Subeen Kang),백운회(Woonhoi Baek),김진선(Jinsheon Kim) 한국조명·전기설비학회 2023 한국조명·전기설비학회 학술대회논문집 Vol.2023 No.11

IoT 펌웨어 보안을 위한 FOTA 시스템 구성

김지수 ( Jisu-kim ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2

다양한 산업과 환경에서 IoT 기술이 사용되는 만큼 보안에 대한 위협도 증가하고 있다. IoT 서비스를 제공하는 디바이스와 시스템이 보안 공격을 당해 중단되는 경우 그에 따른 피해가 막대하기 때문에 IoT 의 보안 중요성은 날로 커지고 있다. IoT 디바이스 보안을 강화하기 위한 방법으로 FOTA 시스템를 통한 펌웨어 업데이트를 하는 것이 필요하다. 본 고에서는 IoT 디바이스 펌웨어 업데이트를 위해 필요한 FOTA 시스템에 대한 아키텍처와 구성 등을 제언한다.

유가의 효윤리와 현대적 계승 방안

김지수(Jisu Kim) 전남대학교 종교문화연구소 2010 종교문화학보 Vol.7 No.-

개인주의와 가족해체로 말미암아 외로운 노인들이 급증하는 현대사회에서, 안전망을 유지하는 방안으로 전통 효윤리가 떠오른다. 본 논문은 유가의 효윤리와 전통법의 불효죄를 간추려 정리하고, 효윤리를 현대적으로 계승 발전시키는 방안을 고민하고 모색해 본다. 부모 자식 간의 관계도 다른 일반 인간관계처럼 상대적 쌍방윤리다. 자식의 효도는 부모의 자애에 대한 보은의 윤리다. 사랑이 물처럼 내리받이라서 치받이 사랑인 효도가 인간의 감정상 어렵기 때문에, 동서고금의 역사문화가 효도를 당위적 도덕규범으로 강조한다. 이러한 효도의 본질을 밝히고 일깨우면서, 慈悲軍을 포함하여 다양한 방안을 강구해 현대적으로 계승 발전시킴으로써, 우리 가족과 사회가 한결 포근하고 행복한 공동체가 되길 바란다. Because of individualism and disintegration of family, the lonely old have rapidly increased and become a dangerous and difficult burden to solve in modern society. This paper summarizes Confucian traditional ethics of filial piety and crimes against them in traditional law, and tries to find out some probable plan to develope them succeedingly in modern prospect. The relation between parents and children is bilateral relative ethics, and children's filial piety to parents is the repayment ethics for parents' love to children, and fulfillment of it is very difficult like a boat sailing against the current, therefore all human religions and philosophies in ancient or in modern times have strongly emphasized filial piety as children's moral duty and ought norm. Through the insight into the nature of filial piety ethics and the diverse plans to develope them modernly including the Compassion Army, I hope our families and societies become more warm and happy communities.

설악산에서 폭우에 의한 거력질 선상지의 형성

김지수(Jisu Kim),손영관(Young Kwan Sohn) 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10

설악산은 매우 가파른 경사면을 가진 기복이 심한 화강암질의 산으로, 강한 계절적 강우는 주로 낙석과 하천의 흐름에 의한 지형 변화와 기반암 노출을 촉진시킨다. 설악산은 선상지의 형성에 적합하지 않은 환경이지만, 2006년 여름에 발생한 폭우로 하룻밤 사이에 길이 170 m, 폭 330 m의 거력질 선상지가 형성되었다. 선상지의 퇴적물은 입도, 퇴적 지형, 그리고 기복 등을 바탕으로 거력질 마운드, 자갈질 사주 및 시트, 그리고 하도로 구분할 수 있으며, 이들은 충적 종렬 사주와 유사한 패턴으로 배열되어 있다. 이들 선상지 퇴적층은 일시적으로 고농도 홍수류의 성질을 가지는 높은 운반능력을 지닌 난류성 판류에 의해 형성된 것으로 해석된다. 한번의 일상적인 수문-기상학적 사건에 의해 선상지가 형성된 것은 퇴적물을 공급하는 근원지가 한계조건(threshold condition)에 도달하였기 때문에 가능한 것으로 추론된다. 즉, 근원지가 한계점에 도달하기 전에는 큰 영향을 미치지 못했을 강우 사건이 계곡 바닥에 있는 거대한 거력질 퇴적물을 재이동시키고 선상지의 형성을 야기하였을 수 있다. 집수역의 한계 조건이 제거된 후 발생한 몇몇의 강렬한 강우 사건은 선상지 표면의 형태 변화만을 야기하였을 것이다. 설악산 선상지는 집수역의 수문학적 기능의 극적인 변화를 만드는 지형적 한계의 역할을 보여준다. 또한 설악산 선상지는 판류가 우세한 선상지의 현대적 예시를 제공한다.

메시지의 생생함과 권고 구체성이 확산과 설득에 미치는 영향

김지수(Jisu Kim),김현석(Hyun Suk Kim) 한국언론학회 2021 한국언론학보 Vol.65 No.6

This study examined how message vividness and recommendation specificity affect the virality and persuasiveness of online police promotional videos that feature police officers arresting criminals or rescuing citizens. Specifically, the present study tested how (a) the vividness of the testimonials of police officers or citizens and (b) the specificity of recommendations to call 112 for police shape the extent to which such narrative-based police promotional videos facilitate people’s transportation into the videos, thereby heightening intentions to engage in interpersonal conversation about and social sharing of the videos (i.e., diffusion), and increasing perceived effectiveness of the videos and trust in the police (i.e., persuasion). The study further investigated how prior attitudes toward the police and transportability moderate the indirect effects of message vividness and recommendation specificity on diffusion and persuasion via narrative transportation. An online experiment (N = 532) was conducted with a 2 (message vividness [between-subjects]: high vs. low [audiovisual vs. text testimonial]) × 2 (recommendation specificity [between-subjects]: high vs. low [detailed vs. brief information about how to call 112 for police]) × 2 (video topic [within-subjects]: arrest vs. rescue) mixed design. Participants were randomly assigned to one of the four between-subjects conditions and watched two videos with different topics (i.e., arrest vs. rescue) in random order. To reduce the potential of case-category confounding, the current study used a multiple-message design approach by creating four videos for each experimental condition and showing one randomly selected video to the participants. The results indicated that prior attitudes toward police interacted with message vividness to indirectly influence diffusion and persuasion by shaping narrative transportation. Specifically, participants who watched more vivid police promotional videos, as compared to those exposed to less vivid videos, experienced greater transportation, which in turn led them to (a) have higher intentions to talk about and share the videos with their social networks, and (b) perceive the videos as more persuasive and show greater trust in the police, but only among those who had unfavorable prior attitudes toward the police. Such indirect effects of message vividness were not found among those who had more favorable prior attitudes. Message vividness did not significantly interact with recommendation specificity or transportability to affect the level of transportation. Recommendation specificity did not impact transportation, either independently or in combination with prior attitudes toward the police or transportability. The findings are discussed in light of their theoretical and practical implications for message effects research on viral and persuasive communication, and for social media-based public communication campaigns.