• The Journal of the Korea Contents Association
• /
• v.22 no.7
• /
• pp.670-675
• /
• 2022

In the era of the 4th industrial revolution, everything is data-centric. The type and amount of data may be central, and new data may be required in special circumstances. As 3D printers are used in various fields, there are fields that are newly challenged. In particular, in the medical field, new attempts that have not been considered before are taking place. This paper is a study to enable research in fields that require physical properties of the human body. In the meantime, research using human organs has mainly used the materials made of silicon. We measure the physical properties of the human body from cadavers, apply these characteristics to develop new materials, and develop artificial organs with 3D printers. Using the artificial organs made in this way, you can practice surgery with a robot that removes kidney stones. In this paper, we would like to introduce a series of research processes to develop advanced materials similar to human organs.

• Journal of Korean Society of Archives and Records Management
• /
• v.21 no.4
• /
• pp.183-200
• /
• 2021

With the revision of the Public Records Management Act in 2020, it has become possible to appraise long-term records more than 30 years old in the record center. However, there was no discussion on the appraisal process except for the revision of the Public Records Management Act. This study aimed to propose a process for appraisal of long-term records in the record center, focused on the roles and functions of the record center, archives, and central archives. To confirm the status and problems of the records appraisal process, we analyzed record management standards and interviewed 4 archivists who have been working as specialists for over 10 years. Based on the analysis results, the appraisal process for long-term records in the record center was redesigned in consideration of the functions and roles of the record center, archives, and central archives.

• The Journal of the Korea Contents Association
• /
• v.22 no.2
• /
• pp.270-280
• /
• 2022

There has been a stream of literature studying moderators of the relationship between organizational ambidexterity and firm performance, but there remains a lack of research on moderators with a strategic perspective. We examined the effect of organizational ambidexterity on a firm's long-term performance and the moderating effect of a firm's relative exploration and exploitation based on a sample of 8,916 firms. We found a positive relationship between organizational ambidexterity and long-term performance measured by Tobin's q. The results also suggest that a firm's relative exploration positively moderates the relationship between organizational ambidexterity and long-term performance, whereas exploitation negatively moderates this relationship. We contribute to the current ambidexterity literature by integrating it with strategy literature. We found that the positive relationship between organizational ambidexterity and long-term performance is enlarged and long-lasting when a firm is a differentiator. In contrast, this positive relationship is lessened and short-lasting when a firm is a cost-leader.

• Korean Journal of Construction Engineering and Management
• /
• v.24 no.2
• /
• pp.79-87
• /
• 2023

Given that most government contracts are based on a fiscal year, long-term continuing construction contracts require appropriate provisions as significant amounts of budget is supposed to be invested for several years. This study drew problems and improvements of the long-term continuing construction contracts by analyzing the contents of FGI and list of construction order. We found that a number of problems, such as the mismatch between laws and enforcement decrees, difference in calculating overheads due to the extension of construction period, many construction orders that are hard to see as budget efficiency and over investment in the final annual contract, were tangled up in the process. To solve the problems mentioned, we suggested several improvements as follows: (1) effect of total construction period and total amount should be guaranteed by a law, (2) it is suggested that the scope of long-term continuing construction contract is determined by a law, and (3) it should be clear about the calculation of overheads concerned with the extension of construction period as well as the estimation of construction period to prevent over investment in the final contract.

• Korea Trade Review
• /
• v.42 no.4
• /
• pp.49-68
• /
• 2017

This paper investigates the spillover effect of the U.S. Interest on Korea's interest rate as well as the role of exchange rate in the spillover effects, by utilizing a open macro model on the determinants of long-term interest rates. According to the cointegration estimation and the Impulse response function, it is found that, across both long-term and short-term, there exist the spillover effect of the U.S. Interest on Korea's interest rate. The fiscal deficit and expected exchange rate have significantly positive relationship with the Koreas's long-term interest rate. Further, foreign exchange market intervention in Korea did not have significant effect on the spillover effect. Thus, this study suggests that exchange rate flexibility would not be enough to restrain the spillover effects of the U.S. interest rate.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
• /
• v.8 no.2
• /
• pp.555-566
• /
• 2018

The aim of the study was to explore the mediating effect of meaning in life on the relationship between meaning making about process of achieving long term goals and happiness. 180 college students completed the open questionnaire about personal long life goal, also rated the scales of meaning making, meaning in life and subjective well-being. The correlation analysis, hierarchical regression analysis, and sobel test were examined. The results as followed. First, meaning making, meaning in life and happiness were positive correlated. Second, the relationship between meaning making about process achieving long term goals and happiness was completely mediated by meaning in life. The finding suggested that meaning making and meaning in life can help to enhance happiness in college students. Also the results supported that meaning in life was important factor that affects subjective well-being in Koran college students. Finally, the limitations were suggested for future research.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2021.06a
• /
• pp.359-359
• /
• 2021

기후변화로 인한 강수량의 지역별, 계절별 불균형은 홍수로 인한 하천 범람피해뿐만 아니라 하천의 건천화로 인한 수생태, 수질, 경관 저해 등의 피해를 야기하고 있다. 이와 같은 기후변화로 인한 수자원의 영향을 평가하기 위해 기상 현상을 재현하고 예측하기 위한 기후모형과 이와 연계하여 지표의 수문 순환과 에너지 순환과정을 모의할 수 있는 지표수문모형의 필요성이 대두되고 있다. 그러나, 하천유출에 대한 모니터링시스템 체계를 구축하기 위해 지표수문모형을 사용하여 하천의 장기유출을 모의하는 시도는 국내에서는 아직 일반화되지 않고 있다. 따라서, 본 연구에서는 횡방향 유출흐름 모의가 가능하도록 개선된 격자형 지표수문모형인 Common Land Model(CoLM)의 우리나라 하천유역에 대한 장기하천유출 모의 적용성을 확인하고자 한다. 이를 위하여 4대강(한강, 낙동강, 금강, 섬진강)의 자연유역을 대상으로 주요 댐 상류유역에 대하여 CoLM이 필요로 하는 지표경계조건자료와 기상입력자료를 구축하고 모형의 주요 매개변수에 대한 검보정을 수행하여 각 지점별 최적의 장기하천유출 모의결과를 도출하고자 한다. CoLM의 지표경계조건자료 구축을 위해서는 고해상도의 인공위성자료 및 지점측정자료를 수집하고, 기상입력자료 구축을 위해서는 기상청에서 제공하는 기상자료를 수집하여, 모형의 계산시간 및 지역예보모델에 많이 사용되고 있는 공간해상도를 고려한 모형의 입력자료는 30km 계산 격자망 자료로 구축될 예정이다. CoLM의 모의성능 평가 및 결과분석을 위해 총 30년(1990-2019) 기간에 대한 모의결과 중, 초기 10년은 초기조건 수립을 위한 안정화 기간으로 제외하고, 다음 10년(2000~2009)은 보정기간으로 설정하고 마지막 10년(2010~2019)은 검정기간으로 설정하여 지표수문모형의 장기하천유출모의 적용성이 평가될 예정이다. 본 논문의 결과는 향후 우리나라 주요 유역에 대해 이상기후로 인한 하천 수자원 및 수생태의 영향을 분석하고, 하천의 건천화 대책 수립 등에 대한 기초정보를 제공할 수 있을 것이라 기대한다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2021.06a
• /
• pp.82-82
• /
• 2021

전 세계적으로 가뭄은 농업·식량안보·수자원관리·생태계 등 다양한 분야에서 부정적인 영향을 미치고 있다. 일반적으로 가뭄은 강수량의 부족으로 발생하고, 지표수와 지하수의 가용성이 제한됨에 따라 작물생산 및 사회·경제적으로 피해가 발생한다. 이러한 영향은 특정 가뭄 모니터링 및 조기 경보와 관련하여 가뭄 지표를 결정할 때 중요한 고려사항이다. 가뭄을 분석하기 위해서는 가뭄 지표를 적용하여 정확하게 반영하고 나타내는 것이 중요하다. 가뭄의 특성을 객관적으로 정량화하기 어렵기 때문에 다양한 지표와 계산을 통한 가뭄 모니터링 및 분석 기술이 필요하며, 강수량, 토양수분, 증발산량 및 식생과 관련하여 가뭄 지표가 개발되었다. 본 연구에서는 혼합 가뭄 지표 (Drought Indicator Blends) 활용하여 우리나라의 가뭄을 분석하였다. 혼합 가뭄 지표는 NOAA (National Oceanic and Atmospheric Administration)의 기후 예측 센터 (Climate Prediction Center, CPC)에서 여러 가뭄 지수를 단기 또는 장기로 구분하여 통합, 개발되었다. 단기 및 장기 혼합 제품은 PDSI (Palmer Drought Severity Index), Z-Index, SPI (Standardized Precipitation Index)를 결합하여 가뭄을 추정한다. 혼합 가뭄 지표는 해당 지역의 단기 및 장기 가뭄을 이해하는데 유용하게 활용할 수 있으며, 현재까지 미국에서 활발하게 연구가 진행되고 있다. 단기 지표는 비관개 농업, 토양수분 등 강수량에 밀접한 관련이 있는 가뭄과 관련되어 평가하며, 장기 지표의 경우 관개 농업, 지하수위 등 장기간 가뭄과 연관성을 가지고 있다. 단기 및 장기 혼합 가뭄 지표를 우리나라에 적용함으로써 기존 단일 가뭄 지수를 활용한 가뭄 분석 이상으로 다방면에서 효율적인 가뭄 모니터링을 할 수 있을 것이라 판단된다.

• Journal of Korea Society of Industrial Information Systems
• /
• v.28 no.6
• /
• pp.11-20
• /
• 2023

The cost of medical treatment for motor vehicle accidents is increasing every year. In this study, we created a model to predict long-term hospitalization(more than 18 days) among minor patients, which is the main item of increasing traffic accident medical expenses, using five algorithms such as decision tree, and analyzed the factors affecting long-term hospitalization. As a result, the accuracy of the prediction models ranged from 91.377 to 91.451, and there was no significant difference between each model, but the random forest and XGBoost models had the highest accuracy of 91.451. There were significant differences between models in the importance of explanatory variables, such as hospital location, name of disease, and type of hospital, between the long-stay and non-long-stay groups. Model validation was tested by comparing the average accuracy of each model cross-validated(10 times) on the training data with the accuracy of the validation data. To test of the explanatory variables, the chi-square test was used for categorical variables.

• Progress in Medical Physics
• /
• v.16 no.2
• /
• pp.89-96
• /
• 2005

In this study, we investigated the effect of time gating threshold on the delivered dose at a organ with internal motion by respiration. Generally, the internal organs have minimum motion at exhalation during normal breathing. Therefore to compare the dose distribution time gating threshold, in this paper, was determined as the moving region of target during 1 sec at the initial position of exhalation. The irradiated fields were then delivered under three conditions; 1) non-moving target 2) existence of the moving target in the region of threshold (1sec), 3) existence of the moving target region out of threshold (1.4 sec, 2 sec). And each of conditions was described by the moving phantom system. It was compared with the dose distributions of three conditions using film dosimetry. Although the treatment time increased when the dose distributions was obtained by the internal motion to consider the TGT, it could be obtained more exact dose distribution than in the treatment field that didn't consider the internal motion. And it could be reduced the unnecessary dose at the penumbra region. When we set up 1.4 sec of threshold, to reduce the treatment time, it could not be obtained less effective dose distribution than 1 sec of threshold. Namely, although the treatment time reduce, the much dose was distributed out of the treatment region. Actually when it is treated the moving organ, it would rather measure internal motion and external motion of the moving organ than mathematical method. If it could be analyzed the correlation of the internal and external motion, the treatment scores would be improved.