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김상명(Kim, Sang-Myung),프레드 에드먼드 보아포(Fred Edmond Boafo),김진희(Kim, Jin-Hee),김준태(Kim, Jun-Tae) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1
Recently to reduce energy consumption in the building sector, insulation regulation of the building envelope has been strengthened more and more. The strengthened regulation on insulation results in thicker building envelope and the thicker envelope makes inner space become narrow. One of the solutions to meet strengthened insulation regulation is using high efficient insulation for the building envelope. Vacuum Insulation Panel (VIP) is one of high efficient insulation which has 8~10 time lower thermal conductivity than existing insulations. By installing VIPs for building insulation, meeting the strict insulation regulation and maintaining large inner space are both possible. Generally, the lifetime of buildings is more than 50 years. However, the study on the long-term performance of VIPs is insufficient. In this paper, the performance and durability of VIPs were investigated. For the performance evaluation, VIPs from 5 companies were investigated. 4 types of VIPs based on fumed silica and 2 types of VIPs based on the glass fiber were tested. To analyze the performance of VIPs the thermal conductivity and inner pressure of VIPs were measured. For the analysis of the long-term performance for VIP, the accelerated aged test based on ISO standard was conducted. The accelerated test was done for 180 days and the test condition was kept at temperature of 50℃ and relative humidity of 70%. This paper compared the performance of VIP depending on the core material. Also, it showed the performance changed according to time and the estimated long-term performance of VIPs based on the accelerated aging test result was discussed. This paper would be a foundational research to help apply VIPs for the building industry.
알루미늄 서브프레임용 Die-cast재의 기공 조건별 가공재와의 MIG용접조건 실험연구
김상명(Sang Myung Kim),조철환(Chul Hwan Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
There are difficulties in the recent automotive market because of world economic crisis. Automotive industries are demanding low-cost car-production and fuel efficiency improvement with light weight materials. The trend in aluminum application for sub-frame has been focused on parts unification, flexible feature and low-cost production. This research proposes the experimental welding development for the aluminum vacuum-diecast and wrought material by controlling pulse wave with porosity diminishing effect.
이상명(Sang Myung Lee),김세준(Say June Kim),이경근(Kyung Keun Lee),김동구(Dong Goo Kim) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.1
Purpose: The aim of this study is to evaluate the significance of tumor size as a predictor of biological tumor behavior and to get some information to decide on the proper operative modality by assessing the survival rate for HCC patients. Methods: Between January 1995 and September 2006, 278 patients with hepatocellular carcinoma (HCC) underwent liver surgery at our hospital. Of the 278 cases, 176 cases (63.3%) underwent liver resection and 102 cases (36.4%) underwent liver transplantation (LT). All the patients were divided into 4 groups according to their tumor size; <2 ㎝, 2∼5 ㎝, 5∼10 ㎝ and >10 ㎝. We analyzed the pathologic outcomes, survival rates and the outcome of each operative modality, as related to the tumor size. Results: The incidence of vascular invasion increased with the tumor size (<2 ㎝: 4.6%, 2∼5 ㎝: 23.3%, 5∼10 ㎝: 32.6%, >10 ㎝: 50.0%)(P<0.005). For the less than 2 ㎝ sized tumor group, the Edmonson-Steiner (E-S) grade III or IV was present in 40.7% of the patients, as compared with 78.9% in the group of patients with a tumor larger than 10 ㎝ (P=0.005). The patients with a larger tumor showed a poorer survival rate. Liver transplantation showed the longer disease free survival compared to liver resection, though there was no significant benefit in the survival rate. Patients with a small sized tumor showed a better outcome when they underwent liver transplantation and patients with a large sized tumor did better when they underwent liver resection. Conclusion: Tumor size can be used as a preoperative predictor of the pathologic outcome when considering that the larger size of tumor the patients had, the more prevalent was vascular invasion, the tumor cell grade was more advanced and the survival rate was poorer. For patients with small sized HCC, liver transplantation can be considered the appropriate treatment modality.
RSA분석과 자율신경기능을 평가하는 호흡주기 설정에 관한 연구
이상명,이성준,안재목,김점근,Lee, Sang-Myung,Lee, Sung-Jun,Ahn, Jae-Mok,Kim, Jeom-Keun 대한의용생체공학회 2007 의공학회지 Vol.28 No.4
Heart rate variability(HRV) is the clinical consequence of various influences of the autonomic nervous system(ANS) on heart beat. HRV can estimate the potential physiologic rhythm from the interval between consecutive beats(RR interval or HRV data), but cardiovascular system governed by ANS is in relation to respiration and autonomic regulation. It is known as RSA representing respiration-related HR rhythmic oscillation. Because the mechanism linking the variability of HR to respiration is complex, it has so far been unknown well. In this paper, we tried to evaluate 5-min RR interval segments under control of respiration in order to find out a proper respiration rate that can estimate the ANS function. 10 healthy volunteers were included to evaluate 5-min HRV data under 4 different respiration-controlled environments; 0.03Hz, 0.1Hz, 0.2Hz, and 0.4Hz respiration. HRV data were analyzed both in the frequency and the time domain, with cross-correlation coefficient(cross-coeff.) for HRV and respiration signal. The results showed maximum cross-coeff. of 0.84 at 0.1 Hz and minimum that of 0.16 at 0.4Hz respiration. Cross-coeff was decreased at a faster rate from 0.1Hz respiration. All mean SDNN, RMSSD, and pNN50 of time domain measures were 108.7ms, 71.85ms, and 28.47%, respectively, and LF, HF, and TP of frequency domain measures were $12,722ms^2,\;658.8ms^2$, and $7,836.64ms^2$ at 0.1Hz respiration, respectively. In conclusion, 0.1Hz respiration was observed to be very meaningful from time domain and frequency domain analysis in relation to respiration and autonomic regulation of the heart.