• Journal of Families and Better Life
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• v.9 no.1 s.17
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• pp.241-257
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• 1991

The objectives of this study are : to measure the level of rent burden. to examine the independent influences of the variables related to rent burden. to measure the level of family economic problem perception. to examine the differences in the level of family economic problem perception due to rent burden, household characteristics, housing characteristics and rent incresing. For these purpose, a survey is conducted using questionaires. The data used in this study included 369 renters living in Seoul. Statistics uses for data analysis were Frequency Distribution. Percentile, men, Pearson's Correlation, Partial Correlation, One-way ANOVA, Breakdown and Multiple Regression Analysis. Major findings are as follows : The average score of rent burden was 35.87, Therefore rent burden of large cities, rental households is very heavy. Family income, housing facility quality, rent type, and rent incresing have independent influences on rent burden. The average of family economic problem perception is above the mid-point of the scale. The level of family economic problem perception differs due to rent burden, family income, family life cycle, family size, occupation of household head, education leval of household head and homemaker, rent type, housing type, housing size, housing facility quality and rent increases. If the level of rent burden is below 25, family economic problem perception is adequate.

• Korean Journal of Materials Research
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• v.17 no.7
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• pp.361-365
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• 2007

A deoxidized low-phosphorous copper processed by eight cycles of accumulative roll-bonding (ARB) was annealed at various temperatures ranging from 100 to $400^{\circ}C$. The annealed copper was characterized by transmission electron microscopy (TEM) and tensile & hardness test. TEM observation revealed that the ultrafine grains developed by the ARB still remained up to $350^{\circ}C$, however above $400^{\circ}C$ they were replaced by equiaxed and coarse grains due to an occurrence of the static recrystallization. The hardness of the copper decreased slightly with the annealing temperature up to $350^{\circ}C$, however they dropped largely above $400^{\circ}C$. Annealing characteristics of the copper were compared with those of an oxygen free copper processed by ARB and subsequently annealed.

• Resources Recycling
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• v.9 no.2
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• pp.3-10
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• 2000

Used aluminum beverage can(UBC) is an important secondary resource. Domestic recycling rate of UBC should be increased from the standpoint of resource savings and environmental protection. Aluminum can to can recycling is divided into two steps. The first step was composed of the processes such as collection of used beverage cans, shredding, magnetic separation, de-lacquring, melting and casting. The second is remelting and casting, heat treatment, hot and cold rolling, annealing, and can making. With brief discussion about this recycling technology, this article covers aluminum can consumption, the present state of aluminum can recycling in Korea, Japan, USA, and Europe.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.6
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• pp.693-697
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• 2010

In current e-commerce system, it happens that client's confidential information such as credit card numbers, pin numbers, or digital certificate may pass through a web proxy server or an altered proxy server without client's awareness. Even though the confidential information is encrypted and sent through SSL(Secure Sockets Layer) or TLS(Transport Layer Security) protocol, it can be exposed to the risk of sniffing by the digital certificate forgery at the proxy server, which is called the SSL MITM(Man-In-The-Middle) Proxy attack. In this paper, current credit card web-payment systems, which is weak at proxy information alternation attack, are analyzed. A resolution with certificate proxy server is also proposed to prevent the MITM attack.

• Korean Journal of Materials Research
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• v.19 no.8
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• pp.432-436
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• 2009

A Cu-Fe-P copper alloy was processed by accumulative roll-bonding (ARB) for ultra grain refinement and high strengthening. Two 1mm thick copper sheets, 30 mm wide and 300 mm long, were first degreased and wire-brushed for sound bonding. The sheets were then stacked on top of each other and roll-bonded by about 50% reduction rolling without lubrication at ambient temperature. The bonded sheet was then cut into two pieces of the same dimensions and the same procedure was repeated for the sheets up to eight cycles. Microstructural evolution of the copper alloy with the number of the ARB cycles was investigated by optical microscopy (OM), transmission electron microscopy(TEM), and electron back scatter diffraction(EBSD). The grain size decreased gradually with the number of ARB cycles, and was reduced to 290 nm after eight cycles. The boundaries above 60% of ultrafine grains formed exhibited high angle boundaries above 15 degrees. In addition, the average misorientation angle of ultrafine grains was 30 degrees.

• Journal of the Korean housing association
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• v.23 no.1
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• pp.1-8
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• 2012

The purpose of this study is to evaluate the supply plan of public rental housing under the Lee Myung-bak government. According to the supply plan, the government will supply public rental housings by 80,000 unit every year from 2009 to 2018, and achieve 12% as stock ratio in 2018. To evaluate the supply plan, this study analyzed housing needs of tenants in private rental housing by using the raw data of Korea Welfare Panel Survey (2008). The results are as follows: (1) It is difficult for the supply plan to meet the housing needs of tenants in private rental housing. (2) The link between supply plan and stock ratio target is weak. (3) To meet the housing needs, it is necessary to supply public rental housings by 107,000 unit every year for 10 years, and, in this case, the stock ratio will be 10% in 2018. In conclusion, this study proposed that the supply plan of public rental housing should be redesigned.

• JOURNAL OF ELECTRICAL WORLD
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• s.302
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• pp.64-70
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• 2002

현재 미쓰비시(삼릉)전기를 비롯한 빌딩관련업계에서는 빌딩의 재건축이나 설비투자는 감소되고 건물$\cdot$설비의 장(長)수명화가 도모되고 있으며, 전체수명에 걸친 경제적 부담을 종합적으로 억제함으로써 러닝코스트를 최적화하려는 경향은 더욱 높아질 것으로 예측된다. 빌딩의 기획$\cdot$설계단계에서부터 폐기까지의 라이프사이클에서 러닝코스트가 점하는 비율은 라이프사이클 코스트(LCC)전체의 $70\%$에서 $80\%$가 된다. 이것을 억제하는 것은 중요한 과제로서, 그 지원시스템으로 고도의 빌딩매니지먼트 시스템(BMS)이 필요하게 된다. 개발한 BMS는 중$\cdot$대규모 빌딩시스템 확대판매를 위한 새로운 시스템이지만 종합관리서비스를 위한 수탁용 지원시스템이기도 하다. 빌딩 라이프사이클의 전(全)단계(기획$\cdot$설계$\rightarrow$건설$\rightarrow$운용관리$\rightarrow$처분)에서 대응하게 되어 있다. 동사그룹(미쓰비시전기 및 미쓰비시전기 빌딩테크노서비스)은 빌딩오너의 경영적 시각에서, 활동이 가능하며 메이커와 서비스회사의 구분없이 다방면에 걸쳐 역할을 담당하고 있다. 또 고객에게 가치를 제공하는 기술과 전국적인 대응체제는 BMS 개발에 큰 힘이 되고 있다. 개발한 BMS의 특징은, 지금까지의 설비관리시스템의 실적을 베이스(경험, 노하우 등)로 다시 보완하여 장치함으로써 임차인관리시스템, 나아가 에너지 절약 요구에 응한 에너지관리까지 확대하여 유기적(관련정보와 연계를 갖도록 한다는 의미)으로 구축한 시스템을 완성한 점이다.

• Journal of Satellite, Information and Communications
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• v.12 no.2
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• pp.15-20
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• 2017

A conventional TV relay broadcast is a method of transmitting a program by means of a microwave, a leased wire, or a satellite. With the latest advances in LTE network, a relay approach using LTE mobile communications network has become increasingly competing with the traditional TV relay broadcast method. Since 2012, TV Chosun has been using the LTE network for marathon production, and channel A has also broadcast a marathon production broadcast using the LTE network. Therefore in this paper, we investigated the marathon relay method using LTE mobile communications network and compared with the traditional TV marathon relay method, and then suggested the optimum method for the marathon relay.

• Journal of the Korean Institute of Gas
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• v.3 no.3 s.8
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• pp.17-22
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• 1999

This study established management system integrated Safety$\cdot$Health, Management System(SHMS) and Environment Management System(ISO 14000) which satisfy all the systems through analyzing the PSM, SMS, BS 8800 and ISRS. Also, this study presented the guideline model which can make regular document forms in the integrated Safety, Health and Environment Management System. Furthermore, integrating management system developed in this study can reduce the duplication and inefficiency of materials and human resources in chemical industries

• Korean Journal of Materials Research
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• v.15 no.9
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• pp.555-559
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• 2005

An oxygen free copper severely-deformed by eight cycles (an equivalent strain of $\~6.4$) of accumulative roll-bonding (ARB) was annealed at various temperatures ranging from 100 to $300^{\circ}C$. The annealed copper was characterized by transmission electron microscopy (TEM) and tensile & hardness test. TEM observation revealed that the ultrafine grains developed by the ARB still remained up to $150^{\circ}C$, however above $200^{\circ}C$ they were replaced by equiaxed and coarse grains due to an occurrence of the static recrystallization. Tensile strength and hardness of the copper decreased slightly with the annealing temperature up to $150^{\circ}C$, however they dropped largely above $200^{\circ}C$. Annealing characteristics of the copper were compared with those of a commercially pure aluminum processed by ARB and subsequently annealed.