• 한국주거학회논문집
• /
• 제16권4호
• /
• pp.37-44
• /
• 2005

The purpose of this study is to analyze the typological characteristics of super high-rise housings in Hong Kong. The results are as follows; 1) Most of the plan types of the residential building in Hong Kong are tower types and they show lots of curves on the external resident blocks so that each resident families can face maximum open air. 2) Each residential unit is arranged symmetrically and systematically around the central core. 3) The most of core types are central core types which are usually planned to place void light well to improve lighting and ventilation. 4) Rooms are arranged in line from entrance to kitchen, to living & dinning room, and finally bedroom and bathroom. Dinning area is arranged together with living area. 5) At least, more than two sides of the each unit were facing the open air; one side is for the view from a bedroom or a livingroom, the other side is for the ventilation of a kitchen or a bathroom.

• Nuclear Engineering and Technology
• /
• 제50권6호
• /
• pp.829-841
• /
• 2018

An experiment was conducted for the OECD/NEA ROSA-2 Project using the large-scale test facility (LSTF), which simulated a 17% hot leg intermediate-break loss-of-coolant accident in a pressurized water reactor (PWR). In the LSTF test, core uncovery started simultaneously with liquid level drop in crossover leg downflow-side before loop seal clearing, and water remaining occurred on the upper core plate in the upper plenum. Results of the uncertainty analysis with RELAP5/MOD3.3 code clarified the influences of the combination of multiple uncertain parameters on peak cladding temperature within the defined uncertain ranges. For studying the scaling problems to extrapolate thermal-hydraulic phenomena observed in scaled-down facilities, an experiment was performed for the OECD/NEA PKL-3 Project with the Primarkreislaufe Versuchsanlage (PKL), as a counterpart to a previous LSTF test. The LSTF test simulated a PWR 1% hot leg small-break loss-of-coolant accident with steam generator secondary-side depressurization as an accident management measure and nitrogen gas inflow. Some discrepancies appeared between the LSTF and PKL test results for the primary pressure, the core collapsed liquid level, and the cladding surface temperature probably due to effects of differences between the LSTF and the PKL in configuration, geometry, and volumetric size.

• Nuclear Engineering and Technology
• /
• 제32권2호
• /
• pp.108-127
• /
• 2000

Hot leg break LBLOCA(Large Break LOCA) had a potential to be a containment maximum pressure accident in YGN3&4, which was induced from excessive conservatism in the CE analysis methodology of mass and energy release. This study conducted mass and energy release experiment for the hot leg break LBLOCA during post blowdown with an integral test facility, SNUF(Seoul National University Facility). This facility simulated YGN 3&4 with volume ratio of 1/1140 based on Ishii's three level scaling. Experiment showed that SI(Safety Injection) water refilled cold leg first and core later. SI water was vaporized in the core, which resulted in the repressurization of reactor. This increase of pressure drove the water in cold leg to flow up half height of U tubes. However, since the water was drained back soon, the release through the SG side broken section by evaporation was negligibly small. This study also provided experimental assessment of RELAP5 results by KAERI for the release through the SG side broken section.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2014년도 추계학술대회
• /
• pp.390-393
• /
• 2014

현재 정보보호에 대한 중요성이 부각되고 있으며 u-Korea 또는 유비쿼터스 IT 시대에서는 정보보호가 더욱 중요시 되고 있으며, 특히 소형 암호 장치에 있어서 핵심이 되는 암호 알고리즘의 보안성이 중요한 부분이지만 전력분석공격은 암호 알고리즘 자체의 안전성이 높다고 하더라도 암호 알고리즘이 구현된 방법이나 구현된 환경에 따라 적용이 가능한 공격이다. 이에 본 논문에서는 전력분석공격에 대하여 설명하고, 실험환경을 분석 하고자 한다.

• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 1996년도 춘계학술발표회논문집(2)
• /
• pp.405-410
• /
• 1996

New methodology for mass and energy release assessment in LBLOCA post blowdown is needed and, first of all, the phenomenologically improved and quantitative assessments through experiment are essential. For tile experiment of a hot leg break LBLOCA in post blowdown, the test facility was set and its feature is that tile broken hot leg has two broken sections in the tore side and in the SG side respectively and a separation valve between the two in order to measure the release rate dividedly. Specially it was focused on whether the mass release through the SG side broken section happened or not. The mass release through the core side broken section is dependent on tile safety injection flow and that through the SG side broken section varies depending on several factors. The principal factor is the primary system pressure and the subfactors such as SI flow rate, SI temperature and initial primary pressure, may contribute, too.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2008년도 춘계학술대회논문집
• /
• pp.345-348
• /
• 2008

The computer-aided performance simulation can reduce periods for development of products and cut down on the cost comparing with former trial-and-error procedures. This study has developed a simulation program for a vehicle thermal management system integrating an engine cooling system and an air conditioning system considering interactions and arrangement of air side heat exchangers such as power steering oil cooler, air-cooled transmission oil cooler, condenser, and radiator. The program may be also used for the system performance analysis according to the configuration of the engine coolant side heat exchangers such as water-cooled transmission oil cooler, EGR cooler, and heater core. Experiments utilizing an environmental wind tunnel has been conducted to assess the performance of the system according to the arrangement of air side heat exchangers. Some modification of the coolant loop layout can enhance the heat core performance up to 7% according to the results of the simulations.

• Nuclear Engineering and Technology
• /
• 제55권7호
• /
• pp.2395-2406
• /
• 2023

To study the influence of parameter uncertainty in small pressurized water reactor (SPWR) once-through steam generator (OTSG), the nonlinear mathematical model of the SPWR is firstly established. Including the reactor core model, the OTSG model and the pressurizer model. Secondly, a control strategy that both the reactor core coolant average temperature and the secondary-side outlet pressure of the OTSG are constant is adopted. Then, the uncertainty quantification method is established based on Latin hypercube sampling and statistical method. On this basis, the quantitative platform for parameter uncertainty of the OTSG is developed. Finally, taking the uncertainty in primary-side flowrate of the OTSG as an example, the platform application work is carried out under the variable load in SPWR and step disturbance of secondary-side flowrate of the OTSG. The results show that the maximum uncertainty in the critical output parameters is acceptable for SPWR.

• 국제물리치료학회지
• /
• 제10권2호
• /
• pp.1779-1784
• /
• 2019

Background: A number of researchers have attempted to improve the balance of stroke patients, however there is still a question as to whether taping is effective in increasing balance. Objective: To determine the effect of paretic and non-paretic side taping on the balance ability in patients with stroke. Design: A single-blind randomized controlled trial Methods: This randomized single-blind controlled clinical trial with a repeated measures study included 45 subjects who were randomly assigned to paretic side taping groups (n=15), non-paretic side taping groups (n=15), and trunk exercise groups (n=15). Trunk exercise and paretic side taping groups had taping on the paralyzed erector spinae, while the non-paretic side taping group had taping on the non-paralyzed erector spinae. Trunk exercises were performed for 30 minutes to promote core muscles. The balance ability measured the center of pressure movement (paretic side, non-paretic side,forward, backward, limit of stability) in the sitting position. All measurements were evaluated using BioRescue. Results: All three groups showed significant increase in all variables after 4 weeks. The paretic and non-paretic side taping groups had a significant increase in all variables after 30 min of attachment. However, there was no significant difference among the three groups. Conclusions: Paralysis and non-paralysis taping improved the balance ability of patients with stroke in an immediate effect of 30 min. However, after 4 weeks of intervention, taping with trunk exercise did not differ from single trunk exercise. In future studies, various analyses need to be conducted through more diverse evaluations.

• 마이크로전자및패키징학회지
• /
• 제13권2호
• /
• pp.1-7
• /
• 2006

본 논문에서는 솔더 레지스트(solder resist)의 두께와 코어의 물성에 따른 인쇄회로기판의 철의 크기와 형상에 대하여 연구하였다. 인쇄회로기판의 굽힘 변형은 적층되는 재료의 열팽창계수의 차이에 의해 발생한다. 따라서 굽힘 변형의 감소를 위해서는 열팽창계수의 차이가 작은 적층 재료를 사용하는 것이 필요하며, 구조 형상에서도 상면과 하면의 불균일성을 완화시킬 필요가 있다. 또한, 적층 재료에서 코어의 강성을 높여 점의 발생을 억제할 수 있다. 코어를 이루는 복합재료는 적층 순서와 섬유 각에 따른 물성 특성의 방향성에 따라 굽힘과 비틀림이 연성되는 현상을 보이며, 이와 같은 성질을 이용하면 휨을 제어할 수 있다. 본 연구에서는 2층으로 구성된 chip scale package (CSP) 기판의 휨에 대한 연구로, 실험 및 유한 요소해석 툴을 이용하여 개선 결과를 도출하였다.

• Nuclear Engineering and Technology
• /
• 제25권2호
• /
• pp.204-214
• /
• 1993

본 논문은 원자력발전소의 배관설계에 파단전 누설(leak-before-break : LBB) 개념이 적용됨에 따라 새롭게 해석대상이 된 분기관파단에 의한 노심지지배럴의 쉘응답을 계산한 것이다. 앞으로 직경 10인치 이상의 고에너지 배관에 대해 LBB 개념이 적용될 것으로 예상되는 바, 이 경우 LBB 적용대상에서 제외되는 유일한 1차측 배관인 3인치 가압기 분무관의 파단을 가정하였고 이때 노심 지지배럴에 가해지는 쉘응답을 구하였다. 이들 응답을 직경 10인치 이상인 배관파단시의 응답과 비교한 결과 앞으로 직경 10인치 이상의 배관에 대해 LBB 개념이 적용될 경우 배관파단에 대한 노심지지배럴의 쉘응답은 무시할 수 있음을 보였다.