• 한국화재소방학회논문지
• /
• 제21권2호
• /
• pp.30-35
• /
• 2007

고분자 물질의 화재 위험성 및 화재시 인명 피해의 감소를 위한 기초자료로 제시하고자 난연제 및 금속분말의 첨가에 의한 난연성 평가를 수행하였다. 본 연구를 위하여 중량감소율,한계산소지수 및 탄화층 생성량 측정, 연기 중량 농도 및 일산화탄소 발생량 측정의 실험을 수행하였다. 금속분말과 난연제를 함유한 acrylonitrile butadiene styrene은 낮은 중량감소율을 나타내었고, 한계산소지수 및 탄화충 생성량은 증가하였으며, 연기 중량 농도 및 일산화탄소의 발생량도 감소하는 결과를 나타내었다. 또한 가장 효과적인 복합체는 tricresyl phosphate-Mo 복합체로 나타났다.

• 천문학회보
• /
• 제37권2호
• /
• pp.140.2-140.2
• /
• 2012

The silicate carbon star IRAS 09425-6040 shows very conspicuous crystalline silicate dust features and excessive emission at far infrared. To investigate properties of dusty envelopes around the object, we use radiative transfer models for axisymmetric and sphericallly symmetric dust distributions. We perform model calculations for various possible combinations of dust shells and disks with various dust species. We compare the model results with the observed spectral energy distributions (SEDs) including the IRAS, ISO, AKARI, MSX and 2MASS data. We find that a model with multiple disks of amorphous and crystalline silicate and multiple spherical shells of carbon dust can reproduce the observed SED fairly well. This supports the scenario for the origin of silicate carbon stars that oxygen-rich material was shed by mass loss when the primary star was an M giant and the O-rich material is stored in a circumbinary disk. Highly (about 75 %) crystallized forsterite dust in the disk can reproduce the conspicuous crystalline features of the ISO observational data. This object looks to have a detached silicate and H2O ice shell with a much higher mass-loss rate. It could be a remnant of the chemical transition phase. The last phase of stellar winds of O-rich materials looks to be a superwind.

• Gut and Liver
• /
• 제12권6호
• /
• pp.633-640
• /
• 2018

Background/Aims: Obesity is a risk factor for gastroesophageal reflux disease (GERD), with several studies demonstrating positive associations between body mass index (BMI) and GERD symptoms. However, little is known about the effect of BMI changes on erosive esophagitis (EE). In this study, we investigated whether BMI reduction could resolve EE. Methods: A retrospective cohort study was performed to assess the natural course of EE according to changes in BMI. Participants undergoing health check-ups from 2006 to 2012 were enrolled, and 1,126 subjects with EE were included. The degree of esophagitis was measured by upper endoscopy and serially checked over a 5-year follow-up. Logistic regression and Cox proportional hazards models were used to investigate the association between BMI reduction and EE resolution. Results: Substantial weight loss is associated with EE resolution. The adjusted odds ratio for EE resolution was 1.44 (95% confidence interval [CI], 1.09 to 1.92) among participants with a decrease in BMI compared to those with no decrease in BMI. The EE resolution rate was related to the degree of BMI reduction. The effect of weight loss on EE resolution was higher among subjects who lost more weight. Compared with subjects with no decrease in BMI, the hazard ratios for EE resolution were 1.09 (95% CI, 0.89 to 1.35), 1.31 (95% CI, 1.01 to 1.72) and 2.12 (95% CI, 1.44 to 3.12) in subjects with BMI reductions of ${\leq}1$, 1-2, and >$2kg/m^2$, respectively. Conclusions: EE resolution is associated with a decrease in BMI, and weight loss is potentially an effective GERD treatment.

• 천문학회보
• /
• 제12권
• /
• pp.10.2-10.2
• /
• 1987

• 천문학회보
• /
• 제13권
• /
• pp.9.1-9.1
• /
• 1988

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2001년도 제21회 학술발표회 초록집
• /
• pp.110-110
• /
• 2001

• 대한기계학회논문집B
• /
• 제30권12호
• /
• pp.1147-1154
• /
• 2006

An experimental investigation was conducted to enhance the heat/mass transfer for impingement/effusion cooling system when the initial crossflow was formed. For the improvement of heat transfer, the circular guide is installed on the injection hole. At the fixed jet Reynolds number of 10,000, the measurements were carried out for blowing ratios ranging from 0.5 to 1.5. The local heat/mass transfer coefficients on the effusion plate are measured using a naphthalene sublimation method. The result presents that the circular guide protects the injected jet from the initial crossflow, increasing the heat/mass transfer. The heat transfer of stagnation region is hardly changed regardless of the blowing ratio. The secondary peak is obviously formed by flow transition to turbulent flow. At high blowing ratio of 1.5, the circular guide produces $26{\sim}30%$ augmentation on the averaged heat/mass transfer while the case without circular guide leads to the low and non-uniform heat/mass transfer. With the increased heat/mass transfer, the installation of circular guide is accompanied by the increase of pressure loss in the channel. However, the pressure drop caused by the circular guide is lower than that for other cooling technique with the circular pin fin.

• 한방비만학회지
• /
• 제15권1호
• /
• pp.33-37
• /
• 2015

Objectives: The purpose of this study is to report the effectiveness of Korean medicine treatment on 254 patients visited obesity clinic. Methods: Two hundred fifty-four patients, who had visited obesity clinic from May 2013 to November 2014, were analyzed by bioelectrical impedance analysis. We analyzed changes of weight, skeletal muscle mass, fat mass, body mass index (BMI) and body fat percentage after treatment, also investigated differences of weight and fat mass loss according to age, BMI and body fat percentage. Results and Conclusions: Male and female percent of the study group was 3.5% and 96.5%. All patients were constituted with 50.0% of 20~29-year-old group, 34.1% of 30~39-year-old and 15.9% of 40 and more year-old. In BMI, $21kg/m^2$, $21.0{\sim}22.9kg/m^2$, $23.0{\sim}29.9kg/m^2$, above $30kg/m^2$ were 20.5%, 30.3%, 42.1%, 7.1%, respectively. In Body fat percentage, under 25%, 25.0%~29.9%, 30.0%~34.9%, above 35% were 11.4%, 23.2%, 30.7%, 34.6%, respectively. 96.1% of patients were showed weight loss compared with baseline, the decrease of body weight was $2.96{\pm}1.86$ kg, that of BMI was $1.13{\pm}0.70kg/m^2$ and that of body fat percentage was $2.43%{\pm}2.06%$ after 1 month treatment. We observed a decline of weight and fat mass with higher BMI and body fat percentage at the baseline.

• 한방비만학회지
• /
• 제22권1호
• /
• pp.47-53
• /
• 2022

Objectives: The purpose of this study was to observe the effect of improving obesity after 4 week complex Korean medicine treatment in obese patients by retrospectively analyzing. Methods: A retrospective chart review was conducted on 44 patients who received obesity treatment at 23 Korean medicine clinics in Daejeon city. We analyzed weight, body mass index (BMI), body fat percentage, body fat mass, muscle mass, hip and waist circumference, EuroQol-5D (EQ-5D), Korean version of obesity-related quality of life scale (KOQOL), and satisfaction surveys at 4 and 8 weeks after treatment. Results: The weight, BMI change after 4 weeks and 8 weeks was decreased significantly. In addition, there were significant differences in fat mass, muscle mass, waist circumference, and hip circumference. Life quality scale EQ-5D and KOQOL showed decreased significantly. In the evaluation of overall satisfaction, safety, help level, recommendation intention, and revisit intention, more than 89% answered positively that they were satisfied. There were no serious side effects. Conclusions: It was significant effect on weight loss and obesity improvement after complex Korean medicine. And quality of life evaluation and satisfaction survey also show positive results.

• Fisheries and Aquatic Sciences
• /
• 제26권6호
• /
• pp.406-422
• /
• 2023

Sarcopenia is an age-related, progressive skeletal muscle disorder involving the loss of muscle mass and strength. Previous studies have shown that γ-aminobutyric acid (GABA) from fermented oysters aids in regulatory T cells (Tregs) cell expansion and function by enhancing autophagy, and concomitantly mediate muscle regeneration by modulating muscle inflammation and satellite cell function. The fermentation process of oysters not only increases the GABA content but also enhances the content of branched amino acids and free amino acids that aid the level of protein absorption and muscle strength, mass, and repair. In this study, the effect of GABA-enriched fermented sarco oyster extract (FSO) on reduced muscle mass and functions via Treg modulation and enhanced autophagy in aged mice was investigated. Results showed that FSO enhanced the expression of autophagy markers (autophagy-related gene 5 [ATG5] and GABA receptor-associated protein [GABARAP]), forkhead box protein 3 (FoxP3) expression, and levels of anti-inflammatory cytokines (interleukin [IL]-10 and transforming growth factor [TGF]-β) secreted by Tregs while reducing pro-inflammatory cytokine levels (IL-17A and interferon [IFN]-γ). Furthermore, FSO increased the expression of IL-33 and its receptor IL-1 receptor-like 1 (ST2); well-known signaling pathways that increase amphiregulin (Areg) secretion and expression of myogenesis markers (myogenic factor 5, myoblast determination protein 1, and myogenin). Muscle mass and function were also enhanced via FSO. Overall, the current study suggests that FSO increased autophagy, which enhanced Treg accumulation and function, decreased muscle inflammation, and increased satellite cell function for muscle regeneration and therefore could decrease the loss of muscle mass and function with aging.