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이세원 응용생태공학회 2023 Ecology and resilient infrastructure Vol.10 No.4
대부분의 어류가 생존을 위해 회유 또는 이동하는 특성이 있음에도 불구하고 국내에 설치된 어도는 평상시에 고유속과저수심의 흐름이 발생할 수 있어 어류의 이동에 장애가 되고 있는 실정이다. 또한 어도에 관한 국내 설계기준상 국내 하천에서식하는 다양한 어종별 유영특성을 고려하지 못하는 한계가 있다. 따라서 어도의 기능을 확보하기 위한 설계기준의 마련이필요하며, 이를 위해 국내 회유성 어종의 유영특성과 어도의 수리특성에 대한 연구가 필요하다. 이에 본 연구에서는 붕어를대상으로 증진유속방법과 고정유속방법을 수행하여 가능한 객관적인 어류의 유영특성을 분석하고 한계유영유속을 제시하였다. 증진유속방법 실험을 수행한 결과 붕어는 0.7 m/s ∼ 0.8 m/s로 하는 것이 바람직한 것으로 확인되었다. 고정유속방법 실험을수행한 결과 붕어의 경우는 0.8 m/s 정도로 확인되었다. 따라서 두 실험 방법을 종합적으로 분석한 결과 어도설계를 위한 한계유영유속을 결정하면 붕어의 경우는 약 0.8 m/s로 판단된다. 향후 다양한 회유성 어종에 대해 유영특성의 실험적 연구를 수행하여 어도설계를위한 대상어종별 유영특성을 고려한 어도설계기준 마련이 필요하다. Fishways installed in Korea usually generate high-velocity flows and low water depth that impede fish movement, despite the fact that most fish are migratory or move to survive. Moreover, domestic design standards for fishways fail to consider the swimming ability of various fish species that live in rivers. Therefore, it is necessary to establish design standards for fishways to function properly, which requires research on the swimming performance of domestic migratory fish and the hydraulic characteristics of fishways. Accordingly, in this research, the swimming performance of fish was objectively analyzed by applying the incremental velocity and fixed velocity methods to carp, respectively, and the critical swimming velocity was presented. As the result, it was appropriate to set the critical swimming velocity to 0.7 m/s - 0.8 m/s for incremental velocity and 0.8 m/s for fixed velocity. Comprehensively analyzing the two experimental methods, the critical swimming velocity for designing the fishway for carp can be determined to be about 0.8 m/s. In the future, it will be necessary to analyze the swimming performance of various migratory fish and prepare fishway design standards for each species.
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일량제어정책을 갖는 이산시간 BMAP/G/1 대기행렬의 고객수와 체재시간 분석
이세원 한국산업정보학회 2024 한국산업정보학회논문지 Vol.29 No.1
In this paper, we studied discrete-time BMAP/G/1 queues under the workload control. Group customers(packets) with correlations arrive at the system following a discrete- time Markovian arrival process. The server starts busy period when the total service time of the arrived customers exceeds a predetermined workload threshold and provides service until there are no customers in the system. From the analysis of workload and waiting time, distributions of queue length at the departure epoch and arbitrary time epoch and system sojourn time are derived. We also derived the mean value as a performance measure. Through numerical examples, we confirmed that we can obtain results represented by complex forms of equations, and we verified the validity of the theoretical values by comparing them with simulation results. The results of this study can be used to obtain key performance measures of complex systems that operate similarly in various industrial fields and to analyze various optimization problems.
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이세원 한국아동복지학회 2023 한국아동복지학 Vol.72 No.4
In Korea, the phenomenon of suicide following child murder is termed”companion suicide,” creating a sympathetic view toward perpetrators and often overshadowing the child victims of abuse. Despite recent efforts to compile statistics on children victimized by suicide after child murder, available data remains incomplete. This study aimed to provide a comprehensive review of discussions surrounding suicide after child murder in Korea, which has, until now, been fragmented. By analyzing court decisions in related cases, this study seeks to promote an understanding of suicide after child murder as a distinct form of child abuse death and provide foundational data for preventive approaches. An analysis of court decisions from 11 cases of suicide after child murder over a 5-year period (2018 to 2022) revealed that all defendants were biological parents, with varying ages of victimized children. Incidents were primarily attributed to mental illness, family discord, and economic difficulties, often interacting rather than acting independently. Despite the nature of these cases, all 11 were sentenced for murder, not child abuse murder, showing significant variation in sentencing for each case. Based on these results, suggestions include introducing a Child Death Review(CDR) system for comprehensive examination of all child deaths, establishing an integrated case management system for children in cases of parental mental illness, creating a social safety net for children left behind, and re-categorizing suicide cases after child murder in the annual report on child abuse.
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이세원,허준영,김주영,김진영,한경도,권혁상 대한내분비학회 2023 Endocrinology and metabolism Vol.38 No.6
Background: Limited longitudinal evidence exists regarding the potential association between smoking status and hip fracture among individuals with type 2 diabetes. We investigated this association using large-scale, nationwide cohort data for the Korean population. Methods: This nationwide cohort study included 1,414,635 adults aged 40 and older who received Korean National Health Insurance Service health examinations between 2009 and 2012. Subjects with type 2 diabetes were categorized according to their smoking status, amount smoked (pack-years), number of cigarettes smoked per day, and duration of smoking. The results are presented as hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations between smoking status parameters and risk of hip fracture in multivariable Cox proportional hazard regression analysis. Results: Compared with never-smokers, an increased adjusted HR (aHR) for hip fracture was observed in current smokers (1.681; 95% CI, 1.578 to 1.791), and a comparable aHR for hip fracture was found in former smokers (1.065; 95% CI, 0.999 to 1.136). For former smokers who had smoked 20 pack-years or more, the risk was slightly higher than that for never-smokers (aHR, 1.107; 95% CI, 1.024 to 1.196). The hip fracture risk of female former smokers was similar to that of female current smokers, but the hip fracture risk in male former smokers was similar to that of male never-smokers. Conclusion: Smoking is associated with an increased risk of hip fracture in patients with type 2 diabetes. Current smokers with diabetes should be encouraged to quit smoking because the risk of hip fracture is greatly reduced in former smokers.
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전시참가업체의 전시회 충성도 결정요인에 관한 연구 -관여도 및 사전지식의 세분화를 중심으로-
이세원,김봉석 한국관광학회 2013 관광학연구 Vol.37 No.4
The purpose of this study is to investigate constructing exhibition loyalty factors based on the types of exhibitors and to explore the relationship between exhibition loyalty determinant factors and exhibition loyalty to establish groundwork to set up exhibition management plan. As a result, the Determinant attributes of exhibition loyalty were divided into 5 factors. The exhibition loyalty determinant factors were exhibition service factor, marketing synergy factor, exhibition brand factor, sales generation factor as well as factor of accessibility and convenience of exhibition center. The results also show that more involvement meant more emphasis on exhibition service factor, sales generation factor, and convenience factor; while, lower involvement meant less recognition. Amount of exhibition related prior knowledge was proportional to the awareness of the exhibition loyalty determinant factors. Exhibition loyalty determinant factors were influential to the simple loyalty with convenience factor and exhibition brand factor having huge impact.
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