심부전 환자 대상 SNS 기반 자기관리증진 프로그램 개발 및 사용성 평가

김 종호,안민정 한국융합과학회 2024 한국융합과학회지 Vol.13 No.2

Purpose The purpose of this study was to develop an SNS-based self-management enhancement program for heart failure patients and to evaluate its usability. Methods This study was a methodological study consisting of the development of a theory-based self-management enhancement program and usability evaluation. Usability evaluation was conducted in two stages: heuristic evaluation and user evaluation. Heuristic evaluation involved assessing the program using a structured questionnaire with three experts. Identified issues were then addressed, and user evaluation involved collecting data through interviews using a structured questionnaire with seven heart failure patients. The collected data were analyzed using descriptive statistics such as frequency, percentage, mean, standard deviation, and content analysis. Results The average age of the research subjects was 67 years, with 71.4% being male. A self-management enhancement program was developed based on literature review results and self-efficacy theory, providing an 8-week program accessible through smartphone SNS. Heuristic evaluation indicated overall usability without significant issues, and user evaluation revealed usability satisfaction at 3.57 points, perceived usability at 81.43 points, and satisfaction at 4.14 points. Conclusion The theory-based self-management enhancement program developed in this study demonstrated usability and usefulness for heart failure patients. It showed potential as an effective strategy for promoting self-management in heart failure patients.

산업장 보건간호 관리가 생산성에 미친 영향에 관한 연구

김모임,종원정 대한간호협회 1978 대한간호 Vol.17 No.5

Preliminary Safety Study of Engineering-scale Pyroprocess Facility

문성인,종원명,유길성,구정호,김호동 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.1

Pyroprocess technology has been considered as a fuel cycle option to solve the spent fuel accumulation problems inKorea. The Korea Atomic Energy Research Institute has been studying pyroprocess technology, and the conceptual design ofan engineering-scale pyroprocess facility, called the Advanced Fuel Cycle (AFC) facility, has been performed on the basis ofa 10tHM throughput per year. In this paper, the concept of the AFC facility was introduced, and its safety evaluations wereperformed. For the safety evaluations, anticipated accident events were selected, and environmental safety analyses wereconducted for the safety of the public and workers. In addition, basic radiation shielding safety analyses and criticality safetyanalyses were conducted. These preliminary safety studies will be used to specify the concept of safety systems forpyroprocess facilities, and to establish safety design policies and advance more definite safety designs.

$New η^3-Allyl-Alkenyl- and η^3-Allyl-Alkynyl-Ir-Cp^* Compounds from Reactions of [Cp^*Ir(η^3-CH_2CHCHPh)(NCMe)]^+ with Alkynes$

진종식,종대성,김미역,이현귀,Jin, Jong Sik,Jong, Dae Seong,Kim, Mi Yeok,Lee, Hyeon Gwi Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.7

Reactions of [Cp*Ir(η3-CH2CHCHPh)(NCMe)]OTf (1) with HC≡CR (R = H, CH2OH) in the presence of bases, B (B=NEt3, PPh3, AsPh3) produce stable Cp*Ir-η3-allyl-alkenyl compounds [Cp*Ir(η3-CH2CHCHPh)(-CH=CH-+B)]OTf (2) and [Cp*Ir(η3-CH2CHCHPh)(-C(CH2OH)=CH- +PPh3)]OTf (3), respectively in high yields. Cp*Ir-η3-allyl-alkynyl compounds Cp*Ir(η3-CH2CHCHPh(-C≡C-R') (4) and Cp*(η3-CH2CHCHPh)Ir-C≡C-p-C6H4-C≡C-Ir(η3-CH2CHCHPh)Cp* (5) have been prepared from reactions of 1 with HC≡CR'(R' = C6H5, p-C6H4CH3, C3H5, C6H9) and HC≡C-p-C6H4-C≡CH in the presence of NEt3.

연구발표초록 ( 에너지 / 환경 ) : 석탄 열분해 타르의 Capillary GC 에 의한 특성 분석 연구

백남준,김영천,박원훈 (종) ( Nam Jun Baik,Yeong Cheon Kim,Won Hoon Park ) 한국화학공학회 1990 춘계학술발표회 Vol.- No.-

Exciton Binding Energy in Wurtzite InGaN/GaN Quantum Wells

승환 박,종재 김,화민 김 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2

The inernal eld and carrier density eects on the exciton binding energies in wurtzite (WZ) In- GaN/GaN quantum-well (QW) structures are investigated using the multiband eective-mass theory, and are compared with those obtained from the at-band model and with those of GaN/AlGaN QW structures. The exciton binding energy is signicantly reduced with increasing sheet carrier density, suggesting that excitons are nearly bleached at densities around 1012 cmfor both In- GaN/GaN and GaN/AlGaN QW structures. With the inclusion of the internal eld, the exciton binding energy is substantialy reduced compared to that of the at-band model in the investigated region of the wells. This can be explained by a decrease in the momentum matrix element and an increase in the inverse screening length due to the internal eld. The exciton binding energy of the InGaN/GaN structure is smaller than that of the GaN/AlGaN structure because InGaN/GaN structures have a smaller momentum matrix element and a larger inverse screening length than GaN/AlGaN structures.

AI 기반 모형을 이용한 홍수위 예측 및 홍수피해 예·경보 기법 개발

김동현,이기성,황보종구,김형수,김수전 한국방재학회 2022 한국방재학회논문집 Vol.22 No.4

This study reviewed the applicability of AI-based models to predict flood water level and evaluate flood damage in small rivers with short arrival times. The Namyangju-si (Jingwan Bridge) watershed, where the most flood warnings have occurred, was selected as the target of study. Rainfall and water level data from 2008 to 2020 were collected for the watershed. A total of 40 rainfall events were identified when the water level was 1m or higher from June to September, corresponding to the flood season. Additionally, flood water level forecasting was performed using AI-based models such as deep neural network (DNN), long short term memory (LSTM), and storage function models. Predictive power evaluation revealed the DNN model displayed the lowest normalized root mean square error (NRMSE) with a value of 0.06. This study concludes that there are issues with the existing flood warning and heavy rain warning standards due to rainfall variability, correlation with the occurrence of damage caused by heavy rain, and the application of consistent standards nationwide. To solve this issue, the cause of flood damage was classified and the risk assessment criteria established by linking the water level and rainfall data. To develop an optimal flood damage classification prediction model based on the established criteria, two models were applied: XGBoost and random forest model. Evaluation of model predictive power revealed the F1-score for XGBoost was 0.92, indicating excellent predictive power. Based on the models presented herein, the flood damage assessment technique using the results of flood prediction can be used as basic data for disaster managers’ decision-making. 본 연구에서는 도달시간이 짧은 소하천의 홍수위 예측 및 홍수피해 예·경보 기법을 개발하고자 AI 기반 모형의 적용성을 검토하였다. 대상유역으로는 홍수특보가 가장 많이 발생한 남양주시(진관교) 유역을 대상으로 선정하였다. 유역에 대해 2008년부터 2020년까지의 강우 및 수위 자료를 수집하였고, 홍수기에 해당하는 6월부터 9월까지의 수위가 1 m 이상일 때를 확인하여 40개의 강우사상으로 분류하였다. 그리고 심층신경망(deep neural network, DNN) 및 장단기 메모리(long short term memory, LSTM)과 같은 AI 기반 모형과 저류함수 모형을 이용하여 홍수위 예측을 실시하였다. 예측력 평가 결과, DNN 모형의 평균 제곱근 편차(normalied root mean square error, NRMSE)가 0.06으로 가장 예측력이 좋았다. 기존 홍수특보 및 호우특보 기준은 전국적으로 일관된 기준을 적용하는 문제점이 있다. 이러한 문제를 해결하기 위해, 수위, 강우 자료 및 피해액 자료를 연계하여 홍수피해 예·경보 기준을 설정하였다. 설정된 기준을 바탕으로 최적의 홍수피해 분류 예측 모형을 개발하고자, XGBoost, 랜덤포레스트 모형을 적용하였다. 모형의 적용성 평가 결과 XGBoost의 F1-score는 0.92로 우수한 예측력을 나타냈다. 본 연구에서 제시한 AI 기반 모형을 토대로 홍수위 예측 및 홍수피해에 대한 위험 정보를 제공할 수 있는 홍수피해 예·경보 기법은 재난 담당자들의 의사결정을 위한 기초 자료로 활용될 수 있을 것으로 판단된다.

미래 기후변화로 인해 발생하는 항공기 결항 및 경제적 손실 전망

이호용(Hoyong Lee ),김경훈(Kyunghun Kim),황보종구(Jong Gu Hwang-Bo),김수전(Soojun Kim) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.5

항공운송산업은 국내⋅외 관광뿐만 아니라 항공물류의 발달로 수요가 증가함으로 생활에서 중요한 역할을 하고 있다. 하지만기후변화로 인한 극한기상이 빈번하게 발생하여 항공기의 운항에 막대한 악영향을 주고 있다. 기후변화로 인한 극한기상은더 심각해질 것으로 예상되는 만큼 결항에 대한 피해 대책이 필요하다. 따라서 본 연구에서는 국내선을 운영하는 13개의공항과 6개의 항공사를 대상으로 미래의 결항 횟수와 그에 따른 경제적 손실을 산정하였다. 이를 위해 SSP (Shared Socioeconomic Pathways) 시나리오를 이용하여 공간적 축소기법과 시간적 축소기법을 적용하였다. 공간적 축소는 머신러닝을 활용하였고, 시간적 축소는 최근린 방법과 유전자 알고리즘을 이용하였다. 그 결과 시나리오에 따라 강우강도는 먼 미래(2081~2100년도)에2.02배에서 3.54배 증가하였고, 풍속은 최소 1.16배에서 최대 1.24배의 증가하는 것으로 나타났다. 이에 따라 항공기 결항기준에 따른 결항의 경제적 손실은 최대 약 8.29배의 증가가 발생하는 것을 확인할 수 있었다. 이를 통해서 항공 산업에서의기후변화에 대한 대비 및 대응 대책의 필요성을 제시하고자 하였다. The aviation industry plays an important role in daily life because of the increase of demand attributable to the development of air logistics as well as domestic and foreign tourism. However, the higher frequency of extreme weather caused by climate change has a large adverse effect on the operation of aircraft. As this effect is expected to increase, measures to reduce flight cancellation are needed. Therefore, in this study, the number of future flight cancellations and related economic losses were calculated for 1 3 domestic airports and six domestic airlines. To calculate the future climate of the airports, we used the recently released Shared Socioeconomic Pathways (SSP) climate change scenario. Then, we applied machine learning and the nearest neighbor with genetic algorithm method for spatial and temporal downscaling, respectively. The calculated results were applied to aircraft cancellation criteria and a damage estimation formula. Depending on the scenario, rainfall intensity increased by 2.02 to 3.54 times and wind speed increased by 1.16 to 1.24 times during 2100 to 2081. Economic losses from aircraft cancellations attributable to future climate increased by up to approximately 8.29 times. The results of this study highlight the necessity of preparing for and responding to climate change within the airline industry.

Detectability Test of H2 Lyman-Werner Band Emission for Far-Ultraviolet Imaging Spectrograph, FIMS

선광일,경욱 민,광선 유,대희 이,수종 박,승한 오,용선 박,용하 김,욱원 남,한원용,인수 육,장현 박,종호 신,호진,Eric J. Korpela,Jerry Edelstein,Kaori Nishikida 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42

Molecular hydrogen (H2) is excited by far-ultraviolet (far-UV) photons and emits uorescent emission in the far-UV bands and in the near- and the mid-infrared bands. Observations of H2 in these photodissociation regions (PDRs) are important in tracing star-forming molecular clouds and in understanding the interaction between newly born stars and molecular clouds. We use the typical PDR model of Sternberg to estimate the observing time (or integration time) required to detect PDRs with the Far-ultraviolet IMaging spectrograph (FIMS) onboard KAISTSAT-4, the rst Korean scientic satellite. The observing time is calculated using a formula based on a rigorous hypothesis testing for the detection limit, in contract to the often-used signal-to-noise ratio. The estimated observing time is also compared with the expected exposure time from one-year all-sky survey.

AHP를 통한 모바일 GUI의 사용성 평가 항목 분석

김 종 희,이 화 세 한국디자인트렌드학회 2023 한국디자인포럼 Vol.28 No.1

Background In order to systematically evaluate various mobile applications in the rapidly changing smartphone market, usability evaluation criteria suitable for the characteristics of the latest devices must be prepared. Accordingly, this study aimed to develop a usability evaluation factors suitable for the characteristics of the latest mobile service. Methods In the preliminary investigation stage, a literature study on usability was conducted, and items with a high proportion in common were selected first. At this time, usability principles were largely divided into principles for product/software evaluation and principles for mobile evaluation. In this study, the priorities among factors were investigated and derived using the AHP hierarchical decision-making method. Result The items selected in the preliminary survey were efficiency and aesthetics. In this study, as a result of the AHP survey, consistency was evaluated as the most important factor, followed by understandability, controllability, intuitiveness, flexibility, visibility, readability, error prevention, conciseness, and standardity. Intuition was evaluated as the most important factor in product/software, consistency was evaluated as the most important factor in mobile, and consistency was evaluated as the most important factor in overall. Conclusion Items derived from the preliminary survey and items derived from the AHP analysis in the main survey were integrated to select items suitable for mobile GUI. It is proposed to designate the final usability evaluation factors selected through this analysis method as intuitiveness, visibility, consistency, understandability, controllability, efficiency, and aesthetics. 연구배경 급격히 변화하는 스마트폰 시장에서 다양한 모바일 애플리케이션을 체계적으로 평가하기 위해서는 최신 디바이스의 특성에 적합한 사용성 평가 기준이 마련되어야 한다. 이에 따라 본 연구는 최신 모바일 서비스의 특성에 적합한 사용성 평가 척도를 개발하는 것을 목적으로 하였다. 연구방법 먼저 예비조사 단계에서 사용성에 관한 문헌 연구를 시행하여 공통으로 높은 비중을 차지하는 사용성 평가 항목을 우선 선정하였다. 이때 사용성 원칙을 크게 제품·소프트웨어 평가를 위한 원칙과 모바일 평가를 위한 원칙으로 구분하였다. 본 조사에서는 AHP 계층적 의사 결정법으로 사용성 요인들 간의 우선순위를 조사하여 도출하였다. 연구결과 예비조사에서 선정된 항목은 효율성, 심미성으로 나타났다. 본조사에서는 AHP 조사 결과, 일관성이 가장 중요한 요인으로 평가되었으며, 다음으로 이해성, 제어성, 직관성, 유연성, 가시성, 가독성, 오류방지, 간결성, 표준성 순으로 중요하게 평가되었다. 제품·소프트웨어에서는 직관성이 가장 중요하게 평가되었고 모바일에서는 일관성이 가장 중요하게 평가되었으며 전체에서는 일관성이 가장 중요한 요인으로 평가되었다. 결론 앞서 예비조사에서 도출된 항목과 본조사에서 AHP 분석을 통해 도출된 항목을 통합하여 모바일 GUI에 적합한 항목을 선정하였다. 이러한 분석 방법을 통해 선정된 최종 사용성 평가 척도를 직관성, 가시성, 일관성, 이해성, 제어성, 효율성, 심미성으로 지정할 것을 제안하였다.