• Journal of the Korean housing association
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• v.22 no.2
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• pp.111-120
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• 2011

This study examined significant factors explaining college students' place attachment to their childhood homes, developed the scale of that, and proposed statistically significant models to explain their place attachment to those home environments. We conducted a questionnaire survey with 32 items. Responses from 358 Michigan State University students were analyzed statistically. From the explanatory and confirmatory factor analysis, 31 items under 4 valid factors named Place dependence, Affection, Rootedness, and Place identity were obtained. This study additionally adapted six types of place attachment to childhood homes from Hess (1997), and examined these types. Idealization (Type1), affection (Type3), and transcendence (Type5) were chosen most often. Finally, this study explored the relationships between housing satisfaction and (1) the four place attachment factors and (2) the six types of place attachment. Results showed the four place attachment factors were more strongly related with housing satisfaction.

• Communications of the Korean Mathematical Society
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• v.30 no.4
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• pp.471-479
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• 2015

In this paper, we prove that any stable f-harmonic map ${\psi}$ from ${\mathbb{S}}^2$ to N is a holomorphic or anti-holomorphic map, where N is a $K{\ddot{a}}hlerian$ manifold with non-positive holomorphic bisectional curvature and f is a smooth positive function on the sphere ${\mathbb{S}}^2$with Hess $f{\leq}0$. We also prove that any stable f-harmonic map ${\psi}$ from sphere ${\mathbb{S}}^n$ (n > 2) to Riemannian manifold N is constant.

• Journal of Plant Biology
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• v.39 no.4
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• pp.237-242
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• 1996

Epidermal leaf cell phytoliths of 17 species of Oryza were examined with backscattered electron imaging with scanning electron microscopy to determine the usefulness of phytolith morphology for systematic studies. Many kinds of identifiable phytolith morphology are observed in the leaf blades of Oryza. They are different among species as well as between adaxial and abaxial surface and costal and intercostal strip portions of leaf blades. Distinguishing phytolith characters are useful at the level of the section, such as Angustifoliae, Ridleyanae, and Granulatae. The results of a cluster analysis using 21 qualitative characters of phytoliths reveal many taxonomic characteristics which are compatible with current taxonomy.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.422-423
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• 2019

In accordance with the Carbon-Free Island by 2030 policy of Jeju Special Self-Governing Province, renewable energy sources are increasing in Jejudo Island. Due to the intermittent output characteristics of wind turbines, one of the renewable energy sources, which can cause unbalanced system conditions between the demand load and the power generation of Jejudo Island. The Korea Power Exchange limits the output of wind turbines for stabilizing the Jeju power system. Therefore, this paper proposes a method to supply a limited output of Sangmyeong Wind Farm in Jeju Power system to Energy Storage System(ESS) and Water Electrolysis Device(WED). The voltage and frequency fluctuation of the Jeju power system is checked accordingly. The simulation results are performed using the PSCAD/EMTDC program.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.122-123
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• 2018

본 논문에서는 옥타브(sacle vector, octave)를 0, 시그마(sigma)는 1.6, 간격(intervals)은 3으로 설정하여 검출한 RobHess SIFT 특징들로 데이터 셋을 만들어 딥 러닝 모델인 VGG-16을 기반으로 SIFT 이미지 특징을 검출하는 방법을 제안한다. DIV2K 데이터 셋을 $33{\times}33$ 크기로 잘라서 데이터 셋을 구성하였고, 흑백 영상으로 판별하는 SIFT와는 달리 RGB 영상을 사용 하였다. 영상을 좌 우 반전, 밝기, 회전, 크기를 조절하여 원본 영상을 변형시켜 네트워크 학습 및 평가를 진행하였다. 네트워크는 영상의 가운데에 위치한 픽셀이 특징점인지 아닌지를 판별한다. 검증 데이터의 결과 98.207%의 정확도를 얻었다.

• Bulletin of the Society of Naval Architects of Korea
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• v.18 no.4
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• pp.1-11
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• 1981

A flow problem around a ship hull with the nonlinear free surface boundary condition has been considered within the potential flow assumption. The Green's function based on the hull boundary condition is constructed numerically and used to satisfy the free surface boundary condition. This singularity to be distributed ideally on the undulating free surface is put actually, for practical reasons, on the flat water surface with the assumption of linear variation of velocities between the two positions. The surfaces of singularity distribution are approximated by Hess and Smith type quadrilaterals. The radiation condition is only crudely satisfied and this produced one of the major difficulties arising in the present way of attacking the problem.

• Journal of Korean Neurosurgical Society
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• v.30 no.6
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• pp.717-723
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• 2001

Objective : Subarachnoid hemorrhage(SAH) is still one of the most serious disease with high morbidity and mortality in the neurosurgical field. Clipping of the aneurysmal neck is the gold standard of the surgical treatment of aneurysmal SAH. The purpose of this study was to investigate the role of the postoperative angiography and to assess the risk factors related to the incomplete clipping. Materials and Methods : From July 1995 to June 1998, the pre- and postoperative angiography were performed in 50 patients among total 81 patients who have underwent the aneurysmal surgery. We reviewed the various contributing factors including age, sex, Hunt-Hess grade, Fisher grade and the premature rupture of aneurysm during operation retrospectively. Careful evaluation of pre- and postoperative angiography focusing on the size, shape, and remnant neck of the aneurysms and vasospasm was performed. According to the angiographic findings, the patients were divided into two groups ; a complete clipping group and an incomplete clipping group. The data were analyzed by using unpaired independent sample t test after F-test to compare the significance between two groups. Results : Incomplete clipping of aneurysms was found in 6(12%) patients through the evaluation of postoperative angiography. Among them, three cases were located on the middle cerebral artery territory. Whereas the patient age, sex, Hunt-Hess grade, and Fisher grade were not significant(p>0.05), an intraoperative premature rupture had a statistical significance(p<0.05). A severe vasospasm occurred in 24(48%) cases and one patient with anterior communicating aneurysm was reoperated due to residual sac. Conclusion : According to our experience, the surgeons' judgement is the most reliable factor in deciding the postoperative angiography. During the aneurysmal surgery, the premature rupture always disturbs a complete clipping of aneurysms. Therefore, the temporary clipping of parent arteries is considered essential for a successful clipping. We believe that the postoperative angiography has a role in decreasing the re-bleeding risk due to clip migration and an inaccurate clipping only in the selected cases.

• Journal of Broadcast Engineering
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• v.23 no.4
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• pp.559-573
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• 2018

Recently, one of the most actively applied image media in the most fields such as virtual reality (VR) is omni-directional or panorama image. This image is generated by stitching images obtained by various methods. In this process, it takes the most time to extract keypoints necessary for stitching. In this paper, we analyze the parameters involved in the extraction of SIFT keypoints with the aim of reducing the computation time for extracting the most widely used SIFT keypoints. The parameters considered in this paper are the initial standard deviation of the Gaussian kernel used for Gaussian filtering, the number of gaussian difference image sets for extracting local extrema, and the number of octaves. As the SIFT algorithm, the Lowe scheme, the originally proposed one, and the Hess scheme which is a convolution cascade scheme, are considered. First, the effect of each parameter value on the computation time is analyzed, and the effect of each parameter on the stitching performance is analyzed by performing actual stitching experiments. Finally, based on the results of the two analyses, we extract parameter value set that minimize computation time without degrading.

• Journal of Christian Education in Korea
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• v.70
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• pp.267-302
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• 2022

Digital transformation, which is accelerating in each area of society due to the COVID-19 pandemic, is also having a profound effect on Christian education. A representative example of digital transformation is the emergence of a digital world called the metaverse. This study understands the metaverse as an expanded space for Christian education and explores digital storytelling as a method for faith formation. It is argued that the characteristics of digital storytelling through metaverse spaces are characterized by interactivity, agency, audiovisuality, sociality, and openness, and that modification through Christian educational frames is necessary in order for this approach to be appropriated to Christian educational practice. To this end, this study examines Anne Wimberly's story-linking approach, and Mary Hess' approach on digital storytelling, which is understood as a way of faith formation for the liberation and Christian vocation through storytelling in a digital space, focusing on authority, authenticity, and agency. It is argued that Christian education on the Metaverse should be a place for change in the Christian life and formation of vocation, and a space where participants' active responses to God's grace be practiced in a digital space in a reciprocal way. This means that learners are encouraged to participate in expressive and relational education that is practiced in the form of play and creation, responding to God's initiative in the metaverse. This study argues that for digital storytelling through the metaverse to become a process of faith formation, it is necessary to connect stories of participants with the story of God's Kingdom in the expanded digital world, aim for a reciprocal space through hospitality and listening, and promote immersive participation and holistic reflection.

• Journal of the Korean Society of Radiology
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• v.83 no.4
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• pp.887-897
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• 2022

Purpose To evaluate the safety and efficacy of stent-assisted coil embolization (SAC) in acutely ruptured cerebral aneurysms without severe symptoms, and thus, the usefulness of the stent itself in patients with subarachnoid hemorrhages. Materials and Methods From January 2017 to June 2019, 118 patients were treated with coil embolization for acutely ruptured cerebral aneurysms without severe symptoms (Hunt & Hess grade ≤ 3). The periprocedural complications, six-month modified Rankin scores (mRS), and six-month radiologic outcomes were compared between 56 patients with SAC and 62 patients without SAC (non-SAC). Results The rate of good clinical outcomes (mRS ≤ 2), as well as the rate of hemorrhagic and ischemic complications, showed no significant difference between the SAC and non-SAC groups. Moreover, compared to the non-SAC group, the SAC group showed a lower recanalization rate on the six-month follow-up angiogram (20% vs. 39.3%, p = 0.001). Conclusion Although stent use was not significantly associated with clinical outcomes in coil embolization of ruptured cerebral aneurysms with non-severe symptoms (Hunt & Hess grade ≤ 3), it significantly decreased the rate of recanalization on follow-up cerebral angiograms.