• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집C
• /
• pp.492-497
• /
• 2001

In the finite element analysis of metal forming processes using general Lagrangian formulation, element nodes in the mesh move and elements are distorted as the material is deformed. The excessive degeneracy of mesh interrupts finite element analysis and thus increases the error of plastic deformation energy. In this study, a remeshing scheme using so-called mesh compression method is proposed to effectively analyze the flash which is generated usually in hot forging processes. In order to verify the effectiveness of the method, several examples are tested in two-dimensional and three-dimensional problems.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2003년도 춘계학술발표논문집 (상)
• /
• pp.479-482
• /
• 2003

비휘발성 메모리인 플래시 메모리는 가볍고, 전력 소비가 적으며, 충격에 대한 저항이 강한 특징이 있다. 그러나 플래시 메모리는 세그먼트당 삭제 횟수가 최악의 경우 10만 번 정도로 제한된다는 단점이 있어서, 만약 삭제가 특정 세그먼트에 집중된다면 전체 수명이 단축되게 된다. 하지만, 플래시 메모리의 모든 세그먼트가 골고루 사용된다면 수명을 연장시킬 수 있다. 이를 위해 저장되는 자료의 유형을 파악하여 Hot, Cold 그리고 Lukewarm 이라는 그룹별로 분리해서 관리한다. 단순한 분리는 사용 횟수의 양극화를 가져오지만, 양극화된 세그먼트에 반대 유형의 자료를 할당하고 관리하면 전체 세그먼트의 사용률을 균등하게 할 수 있다. 이를 위해, 쓰기와 클리닝 작업 외에 양극화의 패턴을 통해 유형을 결정해주는 루틴을 포함하였다.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2005년도 춘계학술대회 논문집
• /
• pp.428-431
• /
• 2005

This paper describes the process design for hot forging of bearing hub. Forging processes of bearing hub are simulated using the rigid-plastic finite element method. In the process called closed die forging without flash, the design of blocker geometry is of critical importance. Forging processes designs are take advantage of computer aided Process planning and experts. But that is difficult to predict metal flow line. So the preform is designed by the expert, and modified through predict metal flow line by CAE. This paper is to approach preform design considered defect such as metal flow and unfitting etc. at the finisher process.

• 정보과학회 컴퓨팅의 실제 논문지
• /
• 제22권6호
• /
• pp.278-283
• /
• 2016

최근 폭발적으로 증가하는 사용자 데이터가 클라우드에 저장됨에 따라 고품질의 일관된 성능으로 클라우드 스토리지 서비스를 제공하는 것이 더욱 더 중요해지고 있다. 하지만 클라우드 관리를 위한 가상머신 이주(migration)로 인해 스토리지 서비스의 품질이 저하될 수 있다. 특히 플래시 캐시를 사용하는 환경에서는 가상머신 이주가 실행 될 경우 기존 서버에 예열된 캐시를 잃고 새로운 머신에서 콜드 스타트하는 문제가 발생한다. 본 논문은 위의 문제를 해결하기 위해 가상머신 이주로 인한 캐시의 콜드 스타트 문제를 시연 및 분석하고 플래시 캐시의 효율적인 핫 스타트를 수행하는 캐시미어 기법을 제안한다.

• 대한임베디드공학회논문지
• /
• 제12권3호
• /
• pp.149-157
• /
• 2017

In this paper, we propose BCMR (Block Classification with Monitor and Restriction) to ensure the isolation and to reduce the interference of blocks between a garbage collection and a wear leveling. The proposed BCMR monitors an endurance variation of blocks during the garbage collection and detects hot blocks by making a restriction condition based on this information. The proposal induces a block classification by its update frequency for the garbage collection and the wear leveling, so we will get a prolonged lifetime of NAND flash memory systems. In a performance evaluation, BCMR prolonged the lifetime of NAND flash memory systems by 3.95%, on average and reduced a standard deviation per block by 7.4%, on average.

• 소성∙가공
• /
• 제12권4호
• /
• pp.340-347
• /
• 2003

In the rigid-plastic finite element simulation of hot forging processes using hexahedral mesh, remeshing of a flash is important for design and control of the process to obtain desirable defect-free products. The mesh compression method is a remeshing technique which enables the construction of an effective hexahedral mesh in the flash. However, because the mesh is distorted during the compression procedure of the mesh compression method, when it is used in resuming the analysis, it causes discretization error and decreases the conversance rate. Therefore, mesh smoothing is necessary to improve the mesh quality. In this study, several geometric mesh smoothing techniques and optimization techniques are introduced and modified to improve mesh quality. Then, the most adaptive technique is recommended for the mesh compression method.

• 대한한방부인과학회지
• /
• 제31권1호
• /
• pp.1-19
• /
• 2018

Objectives: The purpose of this study was to investigate the changes of early puerperium symptoms and Blood Stasis Index in women during the first two weeks after childbirth. Methods: 38 women staying at Korean postpartum management facilities were studied. Questionnaires were filled out on the date of arrival and departure. Changes in overall physical conditions including neuropsychiatric, circulatory, digestive, musculoskeletal, and urogenital and breast symptoms as well as Blood Stasis Pattern were studied. Results: 1. Neuropsychiatric symptoms were shown in order of Depressed Feeling, Insomnia, Dizziness, Headache, and Easy to Anger and Nervous on arrival. All symptoms showed improvement after two weeks, without significance. 2. Circulatory symptoms were shown in order of Excessive Sweating, Edema, Fatigue, Hot Flash, Anemic Feeling, Alternating Chills and Fever, Cold Hypersensitivity, Chills, Oppression in the Chest, and Palpitation on arrival. Hot Flash, Excessive Sweating, and Edema showed significant improvement after two weeks. 3. Digestive symptoms were shown in order of Dyspepsia, Dry Mouth, Constipation, and Loss of Appetite. All symptoms showed improvement after two weeks, without significance. 4. Pain of Muscles & Joints showed improvement after two weeks, without significance. Pain of Teeth & Gingiva showed slight worsening after two weeks, without significance. 5. Urogenital and Breast symptoms were shown in order of Wound Pain, Fever and Distending Pain in the Breast, and Lower Abdominal Pain on arrival. All symptoms showed significant improvement after two weeks. 6. Blood Stasis Index showed significant improvement after two weeks. Conclusion: Most symptoms were improved in women staying at Korean postpartum management facilities for two weeks. Hot Flash, Excessive Sweating, Edema, Wound Pain, Lower Abdominal Pain, Fever and Distending Pain in the Breast and Blood Stasis Index showed significant improvement.

• 대한한방부인과학회지
• /
• 제24권4호
• /
• pp.114-125
• /
• 2011

Objectives: To understand relations general characteristics, lifestyle habits including smoking, alcohol habit, exercise, eating habit and menopausal symptoms measurement indicators during treatment for hot flush in menopausal women. Methods: The participants were 159 women (45~60 yr) who were not currently on hormone therapy, and had reached hot flash scores of 10 or higher. The evaluating indexes of this trial are hot flush score, hot flush visual analogue scale(VAS), Hot flush consistence time, sweating visual analogue scale(VAS), Menopause Rating Scale(MRS), Menopause-specific quality of life questionnaire(MENQOL), Kupperman's Index. Results: 1. When the participants divided according to body mass index(BMI), overweight group showed a high score in all indicators. Therefore, obesity can aggravate the symptoms of menopause. 2. When the participants divided according to drinking habits, Hot flush consistence time of non-alcohol group showed a statistically significant difference. However, the sample size is uneven. Additional studies will be needed. 3. When the participants divided according to eating habits, Hot flush consistence time of regular group showed a statistically significant difference. However, the sample size uneven. Additional studies will be needed. 4. When the participants was divided depending on whether exercise, non-exercise group showed a high score in all indicators. Thus, exercise will be able to improve menopausal symptoms. Conclusions: Improvement of obesity and exercise will be able to improve menopausal symptoms.

• 대한한방내과학회지
• /
• 제44권2호
• /
• pp.207-215
• /
• 2023

This study reported a case of hot flashes in a patient after coronavirus disease-2019 (COVID-19) infection. The patient in this case was hospitalized for eight days and improved after the administration of Korean medicine, mainly Yangkyuksanwha-tang. We evaluated the patient's subjective discomfort daily, and the patient kept a diary of hot flashes every day. After treatment, the degree and frequency of hot flashes were greatly improved and continued two weeks after discharge. In addition, the accompanying hyperhidrosis improved from Grade 2 to Grade 0. This study suggests that Korean medicine might be effective in combating the hot flashes of soyangin-type patients.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2003년도 춘계학술대회논문집
• /
• pp.331-334
• /
• 2003

In the finite element simulation of hot forging processes using hexahedron, remeshing of a flash is very difficult. The mesh compression method is a remeshing technique to construct an effective hexahedral mesh. However, because mesh is distorted during the compression procedure or the mesh compression method, mesh smoothing is necessary to improve the mesh Qualify. in this study, several geometric mesh smoothing techniques and a matrix norm optimization technique are applied and compared which is more adaptive to the mesh compression method.