• 대한치과보철학회지
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• 제51권2호
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• pp.73-81
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• 2013

연구 목적: 이 연구의 목적은 지르코니아 표면처리에 따른 3종의 레진시멘트와 지르코니아의 전단결합강도를 평가하기 위함이다. 연구 재료 및 방법: 총 143개의 디스크 모양의 지르코니아 블록(HASS Co., Gangneung, Korea) 시편을 제작하고 총 13개군(n=11)으로 나누었다. 그중9개군은 표면처리 방식(1. 알루미나 분사, 2. 알루미나 분사와 지르코니아 라이너의 도포, 3.알루미나 분사와 Rocatec (3M ESPE, Seefeld, Germany) 처리) 및 사용한 3종류의 레진시멘트(Bistite II (Tokuyama Dental Co., Japan), Panavia F2.0 (Kuraray Medical, Japan), Super-bond C&B (Sun Medical, Japan))에 따라 나누어 열순환처리 전 접착강도 실험을 시행하였다. 열순환처리 전 접착강도 실험은 위 3종류의 레진시멘트를 3가지 방법으로 표면처리한 지르코니아 시편에 접착하고, 상온의 증류수에 24시간 동안 보관한 후, 전단결합강도를 측정하였다. 열순환처리 후 접착강도 실험은, 열순환처리 전 접착강도 실험에서 우수한 전단결합강도를 보인 지르코니아 표면처리군(알루미나 분사와 Rocatec 처리를 하고 3종류의 레진시멘트를 접착한 3개의 군)과 대조군으로 알루미나만으로 표면처리 후 Super-bond C&B를 접착한 1개의 군을 대상으로 $5^{\circ}C$와 $55^{\circ}C$사이에서 5,000회 열순환처리를 시행하고 전단결합강도를 측정하였다. 결과: 열순환처리 전 접착강도 실험에서는 알루미나 분사와 Rocatec 처리를 한 지르코니아 표면에 Super-bond C&B를 접착한 군이 가장 높은 전단결합강도를 보였다. Super-bond C&B를 사용한 군이 다른 시멘트 군보다 유의성 있게 높은 전단결합강도를 보였으며, 지르코니아 표면에 Rocatec 처리를 한 군이 다른 표면처리를 한 군보다 유의성 있게 높은 전단결합강도를 보였다. 열순환처리를 한 후에는, Rocatec 처리를 한 지르코니아 표면에 Super-bond C&B를 접착한 군만이 유일하게 전단결합강도가 증가하였으며, 다른 모든 군에서는 전단결합강도가 감소하였다. 결론: 본 실험에서는 Super-bond C&B 시멘트가 가장 높은 전단결합강도를 보였으며, Rocatec 시스템은 레진시멘트와 지르코니아의 전단결합강도를 향상시키는 방법이 될 것이라고 사료된다.

• 한국세라믹학회지
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• 제49권4호
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• pp.380-384
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• 2012

This paper deals with the recent developments of high thermal conductivity silicon nitride ceramics. First, the factors that reduce the thermal conductivity of silicon nitride are clarified and the potential approaches to realize high thermal conductivity are described. Then, the recent achievements on the silicon nitride fabricated through the reaction bonding and post sintering technique are presented. Because of a smaller amount of impurity oxygen, the obtained thermal conductivity is substantially higher, compared to that of the conventional gas-pressure sintered silicon nitride, while the microstructures and bending strengths are similar to each other between these two samples. Moreover, further improvement of the thermal conductivity is possible by increasing ${\beta}/{\alpha}$ phase ratio of the nitrided sample, resulting in a very high thermal conductivity of 177 W/($m{\cdot}K$) as well as a high fracture toughness of 11.2 $MPa{\cdot}m^{1/2}$.

• 한국실내디자인학회논문집
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• 제14권2호
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• pp.153-160
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• 2005

The purpose of this study was to clarify residential satisfaction of the Living Environment according to responses of staffs in the Horsing Homes. For this, the data about residential satisfaction of the Living Environment of elderly with dementia were taken from the staffs in 2 nursing homes in Tokyo by the questionnaire. Additional information was collected by interviews and observation. It was impossible that the elderly with dementia answered their satisfaction and needs of spaces. For this reason, staffs who care the elderly with dementia during 24 hours and interact with the elderly with dementia were selected the subjects of this survey. Survey question asked for the general features of the staffs, satisfaction, dissatisfactory spaces and the reasons about dissatisfaction of the elderly with dementia. The data were analyzed using the frequency, percentage, crosstab, paired t-test with SPSS 11 program. The result of this study was as follows. First, most of the elderly with dementia were unsatisfied with their bedrooms and bathrooms in bedrooms. Second, the unsatisfied spaces among the living environment were bedroom, bathroom in bedroom, dining room, day corner, special activity room, common bathroom with mechanical bath, and dressing room. The reasons of the unsatisfied spaces were size, comfort, non-existence of the space, and noise in the space.

• 한국안전학회지
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• 제25권5호
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• pp.27-32
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• 2010

This study is to investigate and compare domestic hazardous toys with harmful substances with foreign toys so that we can find out management criteria for in cognitive infants. Actually, commercially used toys have been collected and tested to find out more effective management standard. it is tried to produce evaluation criteria of environmentally harmful substance but variety of product is needed for overcoming actual barrier due to lot of difficulty huge cost, time, objectiveness. Therefore, This study does not cover all the above. Establishment of evaluation criteria for product harmfulness made by Government or Local government should be continued to improve. Foreign reference material for toy product in Europe, USA, Japan have been investigated and domestic product have been collected and tested for containing heavy metals, formaldehyde, phthalate in the study. All the test have been made in accordance with KSM ISO 2124 to measure heavy metal transfer into body. Toy product used for the study have been purchased in the real market and some of them contains harmful elements with over standard. Post management system such as RAPEX to control periodically should be established for plastic toy with low quality product.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년 춘계학술발표대회 논문집
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• pp.217-221
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• 2009

With the increase in individual income and leisure time, those urban residents who want to stay in farmland on weekend are being increased. On the contrary, rural economic situation is getting worse due to the lack of labor and income. For this, as a win-win strategy between urban and rural life, a Kleingarten(below 'KG') has been attracted by local government such as Kyunggi prefecture in Korea. This article exam the situation of KG, a weekend farm where one can stay the night in a log cabin, from the perspective of Multi-habitation. For this purpose, this study surveyed four KG areas; two cases at Yangpyung and Yeonchoen in Korea, the rest are at Kasama and Yachiyo in Japan. The findings are as following. First, a standard regulation for the application and management of users in KG should be established as soon as possible. Second, the exchange between users in KG and local residents around KG should be activated in terms of well organized exchange program. Third, a sufficient budget by public sectors or an economic scheme where private sectors can participate in this program should be arranged. Lastly, a use of post occupancy should be well managed by user themselves in KG and well monitored by supervisor of KG simultaneously.

• Journal of Korean Biological Nursing Science
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• 제7권1호
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• pp.15-28
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• 2005

Purpose: With post-Genome Project, nurses must be able to incorporate genetic knowledge into their practice. The purpose of the present study aimed at providing the basic information needed to establish an education program for the training of nurses specialized in genetic counseling by comparing and analyzing the education contents in genetics of the various domestic and foreign nursing education institutions, identifying the problems of the existing programs, and investigating the current state of domestic genetic counseling programs. Result: The results of literature review were summarized as follows: Common curricula contents in Korea, Japan and U.S.A. were basic genetic knowledge, genetic counseling and prenatal diagnosis. However, In Korea the curriculum was not included legal, ethical, and social issues. In U.S.A. the course was focused on health promotion related to genetics. The expanded role of nurses is to provide the genetic counseling for clients and their families. So, this articles provided a sample of the new genetic counseling program for nurses which are included basic genetics, genetic counseling, nurse's role and knowledge, legal, ethical, social issues and practicum. Conclusion: this study suggests that this educational program is to brought up genetic specialized nurses in the master's course in the near future.

• Earthquakes and Structures
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• 제7권6호
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• pp.1187-1221
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• 2014

The uplifting and rocking of slender, free-standing structures when subjected to ground shaking may limit appreciably the seismic moments and shears that develop at their base. This high-performance seismic behavior is inherent in the design of ancient temples with emblematic peristyles that consist of slender, free-standing columns which support freely heavy epistyles together with the even heavier frieze atop. While the ample seismic performance of rocking isolation has been documented with the through-the-centuries survival of several free-standing ancient temples; and careful post-earthquake observations in Japan during the 1940's suggested that the increasing size of slender free-standing tombstones enhances their seismic stability; it was George Housner who 50 years ago elucidated a size-frequency scale effect that explained the "counter intuitive" seismic stability of tall, slender rocking structures. Housner's 1963 seminal paper marks the beginning of a series of systematic studies on the dynamic response and stability of rocking structures which gradually led to the development of rocking isolation-an attractive practical alternative for the seismic protection of tall, slender structures. This paper builds upon selected contributions published during this last half-century in an effort to bring forward the major advances together with the unique advantages of rocking isolation. The paper concludes that the concept of rocking isolation by intentionally designing a hinging mechanism that its seismic resistance originates primarily from the mobilization of the rotational inertia of its members is a unique seismic protection strategy for large, slender structures not just at the limit-state but also at the operational state.

• 한국인터넷방송통신학회논문지
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• 제12권5호
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• pp.169-175
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• 2012

동일본대지진은 재난정보전달체계에 여러 가지 시사점을 제공하였다. 특히 재난정보전달에 소셜미디어가 유용할 수 있다는 사례가 나타났다. 본 논문에서는 소셜미디어 중 한 유형인 마이크로블로그를 통해서 지진정보를 전달하는 시스템을 개발하였다. 다양한 소셜미디어의 유형을 분석하면 트위터, 미투데이와 같은 마이크로블로그가 재난정보전달에 가장 적합한 것으로 나타났다. 이를 바탕으로 기상청의 지진통보시스템과 연계하여 지진정보를 트위터와 미투데이에 게시하는 프로그램을 구현 및 실험하였다. 이 시스템으로 지진정보를 쉽게 확인할 수 있고, 지진에 대한 국민들의 반응을 확인할 수 있다. 향후 다른 유형의 재난이나 다른 유형의 소셜미디어를 이용한 재난정보전달 시스템 개발에 활용될 수 있을 것이다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.947-956
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• 2005

In this paper, I scrutinize what Korea has achieved from the KTX(Korea Train Express) project for the past one year of operation since it was open to public in April 2004 while looking into some improvement measures for better services in the future. I tried to compare the clements with those of the Tokaido Shinkasen in Japan. As things may turn at its premier operation, the KTX has been suffering from a small number of passengers, low in demand. However, when I compared the previous year with the post KTX operation of one year, demand of the passenger has increased $40\%$ on Kyong-bu line. I figured the first one year of the KTX operation pretty much followed in the footstep of the Tokaido Shinkansen's. For example, the rate of the each train to be on time as the timetable was equivalent while KTX went through less technical problems than the Tokaido Shinkansen. I have come up with some ideas for improvement, which I believe will lead to the development growth of KTX. First, I suggest that we complete the construction of laying new rails on Kyong-bu line at the earliest possible time. Second, we need to extend the high speed network as well as the rail modernization. Last, I have no doubt that we should secure high technology before we forge in the overseas markets.

• 대한한방내과학회지
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• 제34권2호
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• pp.147-154
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• 2013

Objectives : The aims of this study was to find out whether Jichul-hwan (JCH) extract has an effect on gastric contractility in conscious rats by using a force transducer implanted in the body of the stomach. Methods : The force transducer (model: F-081S, Starmedical, JAPAN) was implanted to the exterior wall of the stomach body in rats. The gastric contractility was measured 30 minutes before and after administration of JCH (110.1 mg/kg). The control group was administrated with normal saline instead of JCH to compare the effect of JCH. The gastric contractility of the control group (normal saline: NS) was also measured 30 minutes before and after administration of NS. Results : The ratio of gastric contractility between before and after medication by JCH was $1.707{\pm}0.731$, and with NS was $0.701{\pm}0.541$. The gastric motility increased by JCH was significantly higher than NS. Conclusions : JCH extract increases gastric contractility in conscious rats. We could expect that this drug would be effective in the treatment of functional dyspepsia or post-surgical gastroparesis.