• Journal of the Korea Institute of Building Construction
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• v.24 no.3
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• pp.331-341
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• 2024

In this study, the flexural strength and ductility of steel-timber composite beams were evaluated to enhance the structural performance of glued-laminated timber beams. Three specimens were fabricated, including one reference glulam beam and two composite beams. The composite beams were constructed by attaching steel sections to the glulam beam using either liquid adhesive or screws. The experimental results showed that the structural performance of the steel-timber composite beams was approximately 2-3 times higher than the reference glulam beam, indicating that both flexural strength and ductility were sufficiently ensured. Notably, the specimen constructed with liquid adhesive demonstrated superior structural performance compared to the screw-attached specimen.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.9 no.2
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• pp.242-248
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• 2006

Purpose: Neonatal hepatitis is the major cause of neonatal cholestasis and may be divided into infectious, metabolic, genetic, and idiopathic neonatal hepatitis. Non-familial, non-metabolic, and non-A, B, C viral neonatal hepatitis is known to have made satisfactory progress, but little is known about its chronic clinical features. Methods: Clinical and histological assessments were carried out in 34 cases with chronic neonatal hepatitis [elevated serum alanine aminotrasferase (ALT) level for more than 6 months] except for A, B, C viral hepatitis, metabolic, or genetic neonatal hepatitis, who were admitted to the Department of Pediatrics, Pusan National University Hospital, from January 1998 to January 2004. Results: Males were more common (70%). Jaundice (100%) and hepatomegaly (44%) were frequent manifestations. Peak serum ALT levels were most commonly below 300 IU/L in 41.2% of patients and peak serum direct bilirubin levels were most commonly between 1.0~5.0 mg/dL in 50% of patients. Ten cases (34%) of 29 patients had positive serum cytomegalovirus (CMV) IgM or urine CMV polymerase chain reaction. Serum ALT level was normalized within 1 year in 11 (37.9%) of 29 cases, and within 2 years in 9 (69.2%) of 13 cases. Serum ALT level was elevated persistently over 2 years in four (30.7%) of 13 cases. Histologic findings such as portal or periportal activity, lobular necrosis, portal or periportal fibrosis were more severe in patients with persistent ALT elevation over 2 years than in those showing normalization of ALT within 2 years (p>0.05). Conclusion: When the elevation of ALT level sustains over 1 year in non-familiar, non-metabolic, non-A, B, C viral neonatal hepatitis, an assessment of the severity of liver injury and a careful monitoring about chronic liver disease may be required.

• Journal of Life Science
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• v.19 no.11
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• pp.1611-1616
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• 2009

This study was conducted to determine the characteristics in breeding of the little tern Sterna albifrons in Shinja-do and Doyo-Deung in Nakdong estuary. The data was obtained in the middle and late 1990's and in the mid 2000's, which were analysed for the breeding information of the little tern. In Shinja-Do, a total of 638 nests were observed in 1995, and the average numbers of eggs laid per nest were 2.48. In 2004 and 2005, 94 and 456 nests were observed, and the average number of eggs laid per nest was 2.16 and 2.53, respectively. There was a significant difference between the average numbers of eggs laid per nest for the 3 respective years. In Doyo-Deung, a total of 269 nests were observed in 1998, and the average number of eggs laid per nest was 2.16. In 2004 and 2005, 1,023 and 1,123 nests were observed, and the average numbers of eggs laid per nest were 2.33 and 2.52, respectively. There was a significant difference (p<0.001) between the average number of eggs laid per nest as well. Hatching success rate by nesting site in Shinja-Do was calculated in 1995. Type A nest (nest located on dry sand land) showed a 56.8% success rate, and type B nest (nest located on the land with dwarf grass), type C nest (nest located on moist land) and type D nest (nest located on the land with shells) showed 55.3%, 36.6% and 59.3% success rates, respectively. The average hatching success rate in Shinja-Do was 54.5%. The most crucial factor for hatching failure was flood, especially, for the type C nests. The hatching success rate by the nesting site in Doyo-Deung showed an average of 73.2%. It was high in type D nest (83.8%) and type A nest (75.9%), and low in type C nest (59.7%). Again, the most crucial factor for hatching failure was flood, especially, for the type C nests. Nakdong estuary has been through many changes over time, particularly in recent. Therefore, continuous efforts to keep it a breeding place for the little tern are urgently required, including overall management of land, protection of reef and sand, etc.

• The Magazine for Energy Service Companies
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• s.26
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• pp.62-66
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• 2004

전미ESCO협회는 현재 미국 내에서 ESCO에 의해 사용되고 있는 M&V방식에 대해 질의하였다. 오늘날 측정평가(M&V)에 있어서 가장 기본적인 방법은 에너지 결정 변수 중의 하나가 측정되는 또는 어쩌면 하나도 측정되지 않는 ''A형 옵션''일 것이다. 이러한 프로젝트에서 절약 보증을 결정하는 데는 사전 설치분석법이 사용되고 있다. 그러나 요구 절감 가치에 대한 분쟁이 발생하는 상황에서 ''A형 옵션''은 상황을 ''조용히'' 해결하는 데 불충분한 정보를 제공할 수 있다. 계약에 충실히 따르는 인기있는 접근법은 설비별 계산서 분석 소프트웨어를 사용하여 건물 전체의 에너지를 분석하는 ''C형 옵션''이다. M&V를 단순화하는 이유는 조명프로젝트의 절약에 대한 이해가 클수록, 신규 설비 위주 프로젝트를 선호하는 고객과 에너지절감 위주 프로젝트를 선호하는 고객간의 대립으로 인한 M&V를 실행하는 비용과 위험성을 감안한 듯 하다.

• Korean Journal of Agricultural Science
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• v.30 no.1
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• pp.59-65
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• 2003

To investigate the relationship of endogenous retroviruses in peccaries and pigs, a set of degenerate primers was used in this study to amplify peccary retroviral sequences. The sequences of two putative retroviral clones showed close homology to mouse and pig retroviral sequences. The peccary endogenous retroviral sequences are significant in that they are the first such sequences reported in peccary species and repudiate old claims in the literature that peccaries do not have C-type retroviral sequences.

• 대한예방의학회:학술대회논문집
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• 1995.10a
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• pp.123-124
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• 1995

• 대한예방의학회:학술대회논문집
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• 1995.10a
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• pp.141-142
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• 1995

• Journal of the Korean Society for Precision Engineering
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• v.23 no.6 s.183
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• pp.160-165
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• 2006

We have designed a high-transmission nano aperture in a perfect electric conductor film with the incident beam of 532 nm wavelength. The aperture basically has a C-shape and is known to produce a bright spot nearby the aperture in small size less than diffraction limit. The bright spot is strongly coupled with the local plasmon excited through the aperture hole. The characteristics of transmission and peak power of the aperture output were calculated using finite differential time domain (FDTD) technique, and the geometry of the aperture was determined to get a maximum transmission and peak power. To find the effect of the surface plasmon induced near by the aperture, we calculated the variations of the transmittance and the beam sizes by changing the size of the input beam irradiated on the aperture.

• Journal of the Korean Society for Precision Engineering
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• v.29 no.5
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• pp.538-544
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• 2012

In this paper, design optimization of C-frame of a precision drilling and autorivet machine has been performed. The machine, Autoriveter has been developed by Korea Aerospace Industry (KAI), For current autoriveter, it is hard to achieve high efficiency because of heavy weight of the machine. In this paper, we suggest new structure of the current C-frame, a part of autoriveter, by optimization. The result of the study can give much profit for mass-production of the machine.

• Information and Communications Magazine
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• v.30 no.8
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• pp.20-28
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• 2013

M2M 관련 업체별 또는 응용분야별 자체적으로 제공되던 M2M 플랫폼의 상호운용을 위한 표준화에 이어 최근에 지능형 M2M 서비스 등 C2C형 서비스를 통한 M2M 서비스의 확산을 위한 기술 개발의 필요성이 점차 증대되고 있으며 이와 더불어 인지 컴퓨팅 (Cognitive Computing) 및 하드웨어 기술의 발전으로 단순히 데이터 전송을 위한 M2M 단말의 역할에서 다양한 M2M 데이터를 기반으로 한 지능형 M2M서비스를 제공할 수 있는 지능형 M2M 단말에 대한 요구도 커지고 있다. 소셜 M2M 서비스는 지능형 M2M 플랫폼을 내장한 M2M 단말들이 자율적으로 소셜 네트워크 기반의 협업을 통해 창출된 지능형 M2M 융 복합 서비스로서 모다정보통신이 중심이 되어 소셜 M2M 서비스를 위한 지능형 M2M 플랫폼의 연구 개발과 함께 개발 기술의 선행표준화와 표준특허의 확보를 추진하고 있다. 연구 결과물은 향후 신규 융 복합 M2M 서비스의 발굴의 촉진 및 관련 산업 활성화에 크게 기여할 것으로 예상된다.