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정재현(Jung JaeHyun),윤혁진(Yun HyukJin),고석민(Koh SeokMin) 한국방재학회 2018 한국방재학회 학술발표대회논문집 Vol.2018 No.-
최근 수변구조물(댐, 교량, 보 등)은 재해, 노후화, 시공오류 등으로 손상 발생이 증가하고 있다. 수변구조물의 손상은 구조물 자체와 더불어 연관피해(도로차단, 제한 등)가 일어날 수 있어 긴급복구가 필요하다. 반면 수변구조물에 피해 발생시 담당공무원(토목관련)의 업무량 폭주, 복구관련 기술매뉴얼 부족, 의사결정 및 예산집행의 지체 등으로 인하여 신속한 대응에 어려움이 있다. 본 연구에서는 긴급복구 시나리오을 피해가 발생된 모의교량, 모의제방, 옹벽 등의 구조물에 적용하고 검토하였다. 긴급복구공법을 도출하기 위해서 구조물의 피해원인, 피해부재, 긴급공사기준, 환경조건, 피해형태를 긴급복구 시나리오에 입력하였다. 손상 발생시 긴급복구를 시행하면 균열, 파손 등 작은 피해단계에서 복구를 하게 되어 추가 피해 확산을 줄일 수 있다. 이에 개발된 긴급복구 시나리오를 모의 교량, 제방 및 지진 피해 옹벽 등 3개소에 적용하고 그 도출공법의 적정성을 판단하였다. 본 시나리오는 전산 자동화가 가능한 체계로 만들어졌기 때문에 시스템 출력으로 그 결과를 확인하였다. 향후 더 많은 피해 구조물에 긴급복구시나리오를 적용하여 현장 적용성을 확장할 예정이다.
저온 외기조건에서 케스케이드 급탕열펌프의 성능특성에 관한 해석적 연구
송재현(Jaehyun Song),정해원(Haewon Jung),박재우(JaeWoo Park),강훈(Hoon Kang),김용찬(Yongchan Kim) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.5
Heat pump systems have been widely adopted in buildings for cooling and heating, due to their higher energy efficiency. Recently, the demand for hot water supply from the heat pump system has been increasing. To increase the water supply temperature with higher system efficiency and reliability, a heat pump water heater adopting cascade cycle was investigated in this study. The cascade heat pump water heater consisted of a low-stage cycle using R410A, and a high-stage cycle using R134a. A simulation program for the cascade heat pump water heater was developed, and verified by comparison with experimental data. The performance of the cascade heat pump water heater was optimized, by varying the compressor rotating speeds of the low- and high-stage cycles. At low ambient temperatures, the performance of the cascade cycle was compared with that of the single-stage cycle. The system efficiency of the cascade cycle was higher than that of the single-stage cycle, showing a lower compression ratio and compressor discharge temperature.
최재현(Jaehyun Choi),공용구(Yong?Ku Kong),정명철(Myung?Chul Jung) 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.4
This study evaluated the short message service (SMS) and multimedia message service (MMS) usability of mobile phones and wireless internet services by performance failure rates and flowcharts that adopted the concept of state diagrams. Forty-eight participants who had an experience of using mobile phones were recruited by posting an advertisement on websites for the experiment. They carried out both SMS and MMS tasks with the mobile phones of LG Cyon and Samsung Anycall as well as the wireless internet services of LGT ez-i, KTF magicN, and SKT NATE. In general, Cyon had the lower performance failure rate than Anycall for SMS, and ez-i had the lowest performance failure rate than the other services for MMS. More specifically through the workflow analysis, most participants used hot keys to take 7~8 steps to send a SMS including a symbol and had a difficulty in typing the symbol. They also took 10~11 steps to send a MMS after taking and attaching two pictures. Anycall, magicN, and NATE had significantly large error and failure rates due to the limited option of the menu paths that users could take and poor compatibilities of menu names and between menu and navigation keys. This study showed the possibility of use of flowcharts for systematic and specific usability evaluation methods and found the causes of performance errors and failures with mobile phones and wireless internet services to provide insight into their design.