• 한국콘텐츠학회논문지
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• 제20권6호
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• pp.445-459
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• 2020

본 연구는 관계상실 경험자의 사건중심성이 의미재구성에 영향을 미치는 과정에서 탈중심화의 매개효과를 검증하고자 하였다. 이를 위해 전국 범위로 관계상실을 경험한 20세 이상 성인남녀 295명(남 109명, 여 186명)을 대상으로 상실경험 관련 질문지, 사건중심성 척도, 탈중심화 척도 및 애도에 대한 의미재구성 척도를 사용해 설문 조사를 실시하였고, SPSS 22.0 프로그램을 사용하여 매개효과를 검증하였다. 연구 결과, 첫째로 사건중심성과 탈중심화는 의미재구성과 정적 상관을 보였다. 둘째, 탈중심화가 사건중심성과 의미재구성을 완전 매개하는 것으로 나타났다. 사건중심성에서 의미재구성으로 가는 직접 경로는 유의하지 않았고, 사건중심성이 탈중심화를 매개할 경우에만 의미재구성에 영향을 미치는 것으로 나타났다. 이러한 결과를 바탕으로 본 연구의 제한점과 후속 연구를 위한 제언을 논의하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제18권3호
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• pp.327-349
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• 2009

Traditional keyword-based searching methods suffer from low accuracy and high complexity due to the rapid growth in the amount of information. Accordingly, many researchers attempt to implement a so-called semantic search which is based on the semantics of the user's query. Semantic information can be described using a semantic modeling language, such as Topic Map. In this paper, we propose a new method to map a topic map to a traditional Relational Database (RDB) without any information loss. Although there have been a few attempts to map topic maps to RDB, they have paid scant attention to handling multi-role topics. In this paper, we propose a new storage structure to map multi-role topics to traditional RDB. The proposed structure consists of a mapping table, role tables, and content tables. Additionally, we devise a query translator to convert a user's query to one appropriate to the proposed structure.

• 한국생산제조학회지
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• 제21권4호
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• pp.556-562
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• 2012

Micro electrical discharge machining (${\mu}EDM$) has been used for non-conventional material removal. One drawback of ${\mu}EDM$ is low productivity. In this study, we tried to find the optimal machining conditions to manufacture the micro hole with an optimal machining time without loss of accuracy. Taguchi method was used to figure out the relation between machining parameters and characteristics of the process. It was found that the electrode wear, the entrance and exit clearance gave a significant effect on the diameter of the micro hole when the diameter of the electrode was identical. Grey relational analysis was used to determine the optimal machining condition for minimum machining time without loss of accuracy. The obtained optimal machining condition was the input voltage of 80V, the capacitance of 680pF, the resistance of $500{\Omega}$, the feed rate of $1.5{\mu}m$/s and the spindle speed of 2900rpm. The machining time was reduced to 48% without loss of accuracy under the optimal machining condition.

• Communications for Statistical Applications and Methods
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• 제30권5호
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• pp.501-516
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• 2023

Knowledge distillation (KD) refers to extracting knowledge from a large and complex model (teacher) and transferring it to a relatively small model (student). This can be done by training the teacher model to obtain the activation function values of the hidden or the output layers and then retraining the student model using the same training data with the obtained values. Recently, relational KD (RKD) has been proposed to extract knowledge about relative differences in training data. This method improved the performance of the student model compared to conventional KDs. In this paper, we propose a new method for RKD by introducing a new loss function for RKD. The proposed loss function is defined using the area difference between the teacher model and the student model in a specific hidden layer, and it is shown that the model can be successfully compressed, and the generalization performance of the model can be improved. We demonstrate that the accuracy of the model applying the method proposed in the study of model compression of audio data is up to 1.8% higher than that of the existing method. For the study of model generalization, we demonstrate that the model has up to 0.5% better performance in accuracy when introducing the RKD method to self-KD using image data.

• Korean Chemical Engineering Research
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• 제44권3호
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• pp.270-276
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• 2006

본 연구에서는 전도열손실과 증발에 의한 열손실을 바탕으로 욕조의 자유표면에서 일어나는 온수의 열손실을 해석하고자 한다. 연구결과 욕조의 성능을 평가할 수 있는 식을 열전달 기본식으로 부터 관계식을 도출하였으며 이 식은 매우 시성적이며 정량적이었다. 특히 욕조 내 온수의 냉각은 증발에 의한 열손실이 지배적이었다. 또한, 온수의 온도 냉각 속도는 온수의 온도에는 크게 영향을 받지 않으나 욕실의 습도에 따라 크게 영향을 받는 것으로 확인되었다. 그러므로 욕조의 온도는 $41{\sim}45^{\circ}C$를 유지하며 욕실의 습도가 95％를 유지하는 것이 가장 효과적이라 판단된다.

• 전기학회논문지
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• 제58권9호
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• pp.1681-1688
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• 2009

This paper proposes a new fault restoration method which adopts the recloser as top agent to release the problems of the data concentration and fault processing delay of the existing DAS(distribution Automation System) under the ubiquitous distribution system. In proposed method, top agent collects the data based on the multi-casting communication with the tie switches of the interconnection point, and then selects a closed switch(tie switch) to transfer the sound outage load to other feeders based on the heuristic search strategy step by step until the load transfer work is finished. Here, a new heuristic rule is developed which can guarantee the relational load balancing and line loss from the collected voltage data. Finally, the several faults are simulated for typical multi-section and multi-interconnection distribution system to prove the effectiveness of the proposed strategy, in particular, for each simulation cases, the load balancing index and line loss index of the obtained solution from the proposed method is compared with those of all of feasible solutions.

• 한국정밀공학회지
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• 제14권8호
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• pp.101-107
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• 1997

In general, grinding is one of the final machining processes which determines the surface quality of machined products. Since the ground surface is affected by the states of grains and voids on the grinding wheel surface, the wheel should be dressed before the machined surface deteriorates over a quality limit This paper describes a systematic approach to decide a proper dressing chance and an optimal dressing depth for the working grinding wheel. An eddy current sensor and a laser displacement sensor are used to measure the loading on the working wheel surface and the topography of the dressed wheel surface respec- tively. The dressing chance can be properly decided through the relational locus between the amount of handing and the machined surface roughness. An optimal dressing depth to guarantee the less wheel loss and the higher wheel surface quality is decided through the analysis of the variance of topography for the dressed wheel surface, which decreases at three different rates according to the accumulated dressing depth.

• 한국직업건강간호학회지
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• 제26권1호
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• pp.19-29
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• 2017

Purpose: The purpose of this study was to define and clarify the concept of reality shock in new graduated nurses. Methods: The hybrid model was used to develop the concept of reality shock. The model included a field study. The participants were 9 newly graduated nurses with a nursing career spanning less than a year. Results: The reality shock in newly graduated nurses was identified to have three dimensions and seven attributes. Specifically: 1) the dimension of performance included two attributes (conflict between theory and practice, and being overwhelmed by the workload), 2) the dimension of relationship included three attributes (loss of support, embarrassment from interference, and relational withdrawal), 3) the dimension of expectations included two attributes(value confusions and incongruity in personal life). Conclusion: Newly graduated nurses' reality shock was defined as a state of incongruence in their entire life that the new nurses experienced owing to value confusions that occurred due to the conflicts between theory and practice in an unfamiliar work environment, getting overwhelmed by the workload, and withdrawing establishing relationships with others due to the loss of support and excessive interference. These findings could help develop intervention strategies to decrease reality shock in newly graduated nurses.

• 한국산학기술학회논문지
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• 제5권1호
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• pp.38-43
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• 2004

We designed and implemented a medical image query system, including a relational database and DBMS (database management system), which can visualize image data and can achieve spatial, attribute, and mixed queries. Image data used in querying can be visualized in slice, MPR(multi-planner reformat), volume rendering, and overlapping on the query system. To reduce spatial cost and processing time in the system. brain images are spatially clustered, by an adaptive Hilbert curve filling, encoded, and stored to its database without loss for spatial query. Because the query is often applied to small image regions of interest(ROI's), the technique provides higher compression rate and less processing time in the cases.

• 아동학회지
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• 제18권2호
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• pp.163-176
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• 1997

Using survey data collected from 275 adolescent children of widowed or divorced single mother families, this study investigated the characteristics of family coping resources, including individual, financial, social, and mother-child relational resources and their effects on the psychological wellbeing of these adolescents. After controlling background variables of the family, higher depression among adolescents was associated with low grade point average, mother's high exposure to negative experiences after loss of father, low attachment to mother, and low sense of self-control. Furthermore, higher grade point average, strong attachment to mother, and high self-control in problem solving were factors predicting higher self-esteem of adolescents. Social network resources were not related to the psychological well-being of the adolescents. Discussion included recommendations for future research. Implications for policy and parent-child relations were discussed with a view to enhancing family functioning of adolescents in single-mother families.