• 한국정보통신학회논문지
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• 제15권7호
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• pp.1613-1620
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• 2011

CSD는 미국 국토안보부(DHS)에서 제시한 IEEE Standard 802.15.4b를 토대로 하는 컨테이너 보안 장치로 ISO 668 표준 규격으로 제작된 컨테이너에 장착되어 컨테이너 도어의 개폐여부를 감지하는 장치이다. 본 연구에서 개발한 CSD(Container Security Device)의 주 기능은 컨테이너 도어 개폐 여부 감지와 컨테이너 내부 환경 상태 및 운송 도중 컨테이너에 가해지는 충격에 대한 이력 조회이다. 본 논문에서는 글로벌 물류 패러다임 변화를 토대로 컨테이너화물 안전수송에 질적 서비스 향상을 위하여 본 연구에서 개발한 ConTracer를 활용하여 구현된 시스템을 한국 일본 간 컨테이너 물류 경로에 시범 운영 테스트를 적용하여 ConTracer의 시스템 성능 평가를 검증하는데 초점을 두었다.

• 한국통신학회논문지
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• 제35권2B호
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• pp.244-251
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• 2010

CSD는 미국 국토안보부(DHS)에서 제안한 Active RFID를 기반으로 하는 컨테이너 보안 장치로 컨테이너 내부에 장착되어 컨테이너 도어의 개폐여부를 감지하는 장치이다. ConTracer는 본 연구에서 개발한 CSD(Container Security Device)로 이 장비의 주기능은 컨테이너 도어 개폐 여부 감지뿐만 아니라 온도, 습도, 충격 센서를 장착하여 컨테이너 내부 환경 상태 및 운송 도중 컨테이너에 가해지는 충격에 대한 이력 조회가 가능하다. 그리고 RFID 동작주파수는 433MHz와 2.4GHz의 두 주파수 대역을 사용하여 각 국가별 주파수 사용제안에 능동적으로 대응 할 수 있도록 하였다. 본 논문에서는 컨테이너 보안 장치의 발전 방향에 대해서 알아본 후 본 연구에서 개발한 ConTracer와 각 회사에서 개발한 CSD를 비교하여 보고, ConTracer를 이용하여 설계 및 구현한 CSD 시스템을 소개한다. 마지막으로 구현된 CSD 시스템은 한국 중국 간 컨테이너 물류에 시범서비스를 실시하여 구현한 CSD 시스템을 검증 하였다.

• Journal of Korean Neurosurgical Society
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• 제64권2호
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• pp.229-237
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• 2021

Objective : Expansion in the spinal canal area (SCA) after laminoplasty is one of the critical factors to relieve the preoperative symptoms. No previous study has compared the increases in SCA achieved by open-door laminoplasty (ODL) and double door laminoplasty (DDL) according to the preoperative lamina angle (LA). This study was designed to clarify the relationship between the laminoplasty opening angle (OA)/laminoplasty opening size (OS) and increases in the SCA following ODL and DDL according to the preoperative LA using a simulation model. Methods : The simulation model was constructed and validated by comparing the clinical data of 64 patients who had undergone C3-C6 laminoplasty (43 patients with ODL and 21 patients with DDL). SCA expansion was predicted with a verified simulation model at various preoperative LAs (from 28° to 32°) with different OAs (40° to 44°) and OSs (10 mm to 14 mm) recruited from patient data. Results : The constructed simulation model was validated by comparing clinical data and revealed a very high degree of correlation (r=0.935, p<0.001). In this validated model, at the same OA, the increase in SCA was higher following ODL than following DDL in the usual LA (p<0.05). At the same OS, the increase in SCA was slightly larger following DDL than following ODL, but the difference was not significant (p>0.05). The difference was significant when the preoperative LA was narrower or much wider. Conclusion : Based on clinical data, a simulation model was constructed and verified that could predict increases in the SCA following ODL and DDL. When applying this model, prediction in SCA increase using the OS parameter was more practical and compatible with clinical data. Both laminoplasties achieved enough SCA, and there was no significant difference between them in the usual range.

• 한국화재소방학회논문지
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• 제34권2호
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• pp.156-165
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• 2020

본 논문은 주거형태를 가지는 건축물의 성능위주설계 시 수행되는 피난 지연시간(인지 시간 + 개시 시간)의 적용과 세대 내 방화문의 개방 정도가 피난 안전성 평가에 어떠한 영향을 미치는지 파악하고 현실적 대안을 제시하기 위한 논문이다. 본 연구를 수행하기 위해 먼저 2018년 6월까지 시행되었던 광주광역시의 성능위주설계 대상 건축물 중 주거형태를 가지는 건축물(공동주택, 도시형생활주택 등)의 피난 안전성 평가에 대해 선행 조사를 하였다. 그런 다음 선행 조사된 건축물 중 일반적으로 많이 사용되고 있는 2가지 대표적인 Type에 대해 피난 지연시간은 W1, W2를 적용하고 방화문의 개방 정도는 전체개방, 1/4 개방, 누설 틈새를 각각 적용하여 시뮬레이션한 다음 피난 안전성 평가를 수행하였다. 피난 안전성 평가의 수행결과 방화문 개방 정도가 전체개방 및 1/4 개방 상태에서 사생활 침해 등을 고려하여 피난 지연시간 W2를 적용한 경우에는 피난 안전성을 모두 확보하기 어려운 것으로 나타났으며, 누설 틈새를 적용한 경우에만 피난 지연시간 W2를 적용해도 피난 안전성이 확보되는 것으로 나타났다. 따라서, 주거형태를 가지는 건축물이 성능위주설계 대상이 될 때 피난 안전성 평가 수행 시 CCTV 설치 등으로 사생활 침해 등의 우려가 있는 국내 현실을 반영하여 피난 지연시간은 W1보다는 W2의 적용을 검토하고 방화문의 차연성능 확보 및 성능위주 설계의 고도화를 위해 방화문의 개방 정도에 누설 틈새를 적용하는 방안도 함께 검토해 줄 것을 제안하고자 한다. 이를 통해 성능위주 설계 시 좀 더 현실화된 자료로 피난 안전성 평가를 수행함으로써 한 단계 더 발전된 성능위주설계가 될 것으로 기대된다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2546-2551
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• 2007

Weather Strip(W/S) is a rubber part to proof water, sound and dust for opening and shutting devices including vehicle doors. And it requires high dimension precision and durability to proof water, noise, vibration and etc. But ironically it itself makes some wind noise because of some protuberance with glasses. The air flow analysis of door part of vehicle makes it possible to calculate and find out the cause of wind noise. In previous analysis, we focus on the numerical air flow analysis of the automobile side part. We do 2D-C.F.D first and 3D second. Through simulations, we can calculate the amount of sound pressure level at the glass run and find out the effects of glass run to make wind noise. Finally we can improve shape of glass run to reduce wind noise although it is small amounts of sound pressure reduction compared with total vehicle noise level.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.17-20
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• 2006

Korean traditional houses have been developed in sympathy with natural environment and formed comfortable indoor condition by properly using surrounding natural resources including building layout, space construction and material our traditional wooden windows adjusting ambient temperature and humidity have both the functions of window and door, although they are clearly divided in the West. While window paper is attached from the outside in China and Japan, it is attached from the inside in Korea. The opening and closing mode of windows is similar and their dimensions are shown not to he standardized but diverse in terms of the characteristic of wooden furniture and that of components placed between columns. Thus this study is to look into the performance of band-lattice door of a typical traditional one by observing changes in sound absorption characteristics according to difference in thickness and finishing method of window paper and those in sound absorption characteristics with the changed thickness of air layer in traditional windows and doors.

• 한국주거학회논문집
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• 제5권2호
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• pp.29-40
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• 1994

The purpose of this study is to survey the transition of the type of openings in korean traditional archiectures. To do this, various types of openings at the backside of Daechung of 23 Hyang-Gyo Myung-Ryun-Dangs were investigated. After the classification in some groups according to their types and their periods of constuction, the tasnsition of the type of openings was analysed. Results are as follows. (1) The openings constructed form 16th to 17th century, the earliest form, is a ledged and battened panel window(or framed and ledged panel window) whose mullion is built on the frame of window. It is presumed that these types were widely used before 17th century. (2) The next type is ledged and battened panel window(door) (or framed and ledged panel window) which lacks a mullion. These types were thought to be customed after 18th century. (3) The lastest type, which is appeared from 19th to 20th century, is an characteristic backside opening(ledged and battened panel window or framed and ledged panel window) that among 3 column spacings the central one is enlarged in comparison with the right and left ones. Through this transition pattern of the openings, can be menifested that the trend of 20th century is to enlarge convenience of usage by constuctiong door and eliminating some windows.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.1147-1150
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• 2007

Korean traditional houses have been developed in sympathy with natural environment and formed comfortable indoor condition by properly using surrounding natural resources including building layout, space construction and material. Or traditional wooden windows adjusting ambient temperature and humidity have both the functions of window and door, although they are clearly divided in the West. While window paper is attached from the outside in China and Japan, it is attached from the inside in Korea. The opening and closing mode of windows is similar and their dimensions are shown not to be standardized but diverse in terms of the characteristic of wooden furniture and that of components placed between columns. Thus this study is to look into the performance of band-lattice door of a typical traditional one by observing changes in sound insulation characteristics according to difference in thickness and finishing method of window paper and those in sound insulation characteristics with the changed thickness of air layer in traditional windows and doors.

• 한국기계가공학회지
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• 제19권2호
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• pp.81-88
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• 2020

The damping hinge of a built-in refrigerator was examined in terms of its stress and fatigue life. Analysis of the initial design showed that stress concentration occurred at the concave surface of the hinge lever, which was broken during the door opening-and-closing endurance test of the prototype. The maximum von Mises stress at this location exceeded the yield strength. In addition, Goodman fatigue analysis of the initial design showed that the fatigue life at this location was consistent with the failure observed during the endurance test. Based on these results, an improved design for the damping hinge was derived. Analysis of this improved design showed that the stress concentration in the hinge lever of the initial design was eliminated. In this case, the maximum stress occurred at the position where the hinge lever was in contact with the door stopping pin, and the maximum von Mises stress was smaller than the yield strength. Goodman fatigue analysis of the improved design indicated that the fatigue life of the entire damping hinge was infinite. It was therefore concluded that the improved design does not suffer from fatigue damage during the endurance test.

• 대한안전경영과학회지
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• 제19권2호
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• pp.95-100
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• 2017

In this study, the bacterial contamination level of equipments and devices in the nuclear medicine department of a university hospital was investigated. CNS was detected from the sample collected from the door opening button of the nuclear medicine department. Bacillus sp. was detected from the table and CNS with Bacillus sp. were detected from the control button at the PET-CT room no.1. Also, CNS was detected from the table and the control button at the PET-CT room no.2. In the distribution room no.1, CNS and Bacillus sp. were detected while CNS being detected from the distribution room no.2 and CNS with Bacillus sp. being detected from the distribution room no.3. In the injection room, Enterrococcus faecium and Pontoea sp. were detected. On the table of the ecsomatics room, Pontoea sp. was detected. Bacillus sp. was detected from the inside of the syringe Pb shield and CNS was detected from the outside. Enterrococcus faecium was detected from the Gamma camera table and Bacillus sp. was detected from the door grip. On the chair at the patient waiting room, Pseudomonas aeruginosa abd Bacillus sp. were detected. Therefore, it was understood that infection should be prevented by securely sterilizing examination devices after each examination, maintaining cleanliness by regular sterilization of waiting chairs and such objects with a number of direct contacts with patients, and infection education for the features of nuclear department.