랙크식창고 스프링클러설비의 배관설계방식 검토를 통한 최적설계방안 연구

이유식(Lee, You-Sik),곽지현(Kwark Ji-Hyun),김형석(Kim Hyeong-Seok),유동균(You Dong-Kyun),안영철(Ahn Young-Chull) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.2

The accurate design of the sprinkler system is very important for a rack-type warehouse because it has high fire loads and it is very difficult to suppress the fire due to the high loads. In this study, the hydraulic calculation using the PIPENET program was performed and the results were compared and analyzed to investigate the optimal design method according to the piping design methods for the automatic rack-type warehouse. The design methods are about the design of the pipe schedule system based on the fire safety standard, the design for the efficient construction, and the design using the upper limit value of piping. The design of the pipe schedule system, which adopts a predetermined piping size according to the number of heads, is easy to design, but there is a concern that the quantity of water is increased and the water source is soon exhausted. The design for the efficient construction, which has the diameter of the end portion is largely applied to improve the construction efficiency, increases the construction cost slightly but the required amount of water is decreased. The design using the upper limit value of piping, which limits the maximum size of piping to be less than a certain value, can save the construction cost as well as the quantity of water, so it improves safety and reliability of the sprinkler system.

랙크식 창고의 인식에 관한 연구와 법규개정에 대한 제안

이유식(Lee, You-Sik),안영철(Ahn, Young-Chull) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.2

Currently a rack-type warehouse is defined as “a shelf or something similar that can hold things”. However, there are a lot of disagreements when installing fire-fighting facilities or conducting administrative works against fire stations because of the ambiguous definitions of the regulations. In this study, suggestions for performance improvement were provided through the questionnaire survey which are analyzed based on the KS regulations. As a result, it is proposed to revise the definition as “a pallet rack excluding the lightweight class of racks with a total height of 4 m or more as a construct for three-dimensionally storing unit cargoes”. In addition, as NFPA regulations in the United States, it is necessary to make continuous efforts to change to a performance-oriented design type that installs fire-fighting facilities according to characteristics of fire and warehouse goods.

한국채택국제회계기준(K-IFRS)의 도입과 회계이익의 질에 관한 연구

이유식(Lee, You Sik),홍정화(Hong, Jung Hwa) 한국국제회계학회 2013 국제회계연구 Vol.0 No.47

본 연구에서는 먼저 K-IFRS 조기 도입 기업을 대상으로 하여 회계이익의 질에 대한 평가를 의무 도입 이전 기간에 대해 검토하고, 이어서 의무 도입 기간 이후에 조기 도입 기업과 의무도입 기업을 비교해 봄으로써 K-IFRS 조기 도입효과의 지속성과 의무 도입효과를 검증하였다. 본 연구의 표본은 2009년부터 2011년까지 코스피 및 코스닥시장에 상장된 12월 결산법인으로 하였으며, 이 중 금융업에 속한 기업은 제외하였다. 또한 Kis-value와 Fn-Guide에서 재무자료와 주가관련 자료를 획득할 수 없는 기업, 자본잠식 기업, DA, PDA, CON1, CON2를 측정할 수 없는 기업 및 극단치의 영향을 줄이기 위해 R-Student 절대값이 3을 초과하는 기업을 제거하였다. 이 조건에 따라, 최종적으로 총 3,792개의 표본이 선정되었다. 본 연구의 실증분석결과를 정리하면 다음과 같다. 첫째, K-IFRS를 조기 도입한 기업일수록 의무 도입 이전 기간에 재량적 절대값은 유의하지 않은 것으로 나타나 국내 선행연구의 결과와 동일하게 나타났다. 하지만 조기 도입한 기업일수록 보수적인 회계처리를 한다는 결과로 나타나 다른 선행연구와 결과가 일치하였다. 둘째, K-IFRS를 의무 도입한 이후 조기 도입한 기업과 그렇지 않은 기업간의 재량적 발생액의 절대값과 성과대응 재량적 발생액의 값, 그리고 회계처리의 보수성에는 유의한 차이가 없는 결과로 나타났다. 즉, K-IFRS 의무 도입이후에 모든 기업이 상향평준화된 회계이익의 질을 공유하여 의무 도입이후에는 조기 도입 기업과 의무 도입 기업간의 회계이익의 질의 차이가 없음을 의미한다. The purpose of this study is to examine the earning quality of early K-IFRS adoption corporation before mandatory adoption periods(2009-2010). And comparing the early & mandatory K-IFRS adoption corporation in the mandatory adoption period(2011), we test the effects of the consistency and the mandatory K-IFRS adoption. For the analysis, we chose 3,792 companies which are listed in KOSPI and KOSDAQ markets for 2009-2011 whose fiscal year-end is December. The results of this study can be summarized as follows : First, the companies early adopted K-IFRS did not give significant evidence in ABSDA& ABSPDA before mandatory adoption periods(2009-2010). But the early K-IFRS adoption companies show the result of conservative accounting polish. This result of our empirical research was consistent with the precedent studies. Second, for mandatory K-IFRS adoption(2011), We did not find out the significant difference beween the early adoption companies and mandatory adoption companies in ABSDA, ABSPDA, conservative accounting polish. Namely, it did not show the significant difference beween the early adoption companies and the mendatory ones in the quality of earning.

한국문학 영어권 번역 소개 연구

이유식(Lee You-Sik) 한국번역학회 2000 번역학연구 Vol.1 No.1

랙크식 자동창고의 화재위험성 및 개선방안에 대한 연구

이유식(You-Sik Lee),안영철(Young-Chull Ahn),남유진(Yu-Jin Nam),유동균(Dong-Kyun You),곽지현(Ji-Hyun Kwark) 한국동력기계공학회 2017 동력시스템공학회지 Vol.21 No.3

과민성 방광의 최신 지견

이유식(You Sik Lee) 대한여성건강학회 2001 여성건강 Vol.2 No.1

V2X 통신을 위한 보안기술

이유식(Lee You Sik),심상규(Sim Sang Gyoo),김덕수(Kim Duk Soo) 한국정보보호학회 2014 情報保護學會誌 Vol.24 No.2

차량간 소통을 통하여 사고를 미연에 방지하고, 운전자의 편의성을 높일 수 있는 V2X는 차세대 자동차 기술 중 하나로 인식되어, 주요 자동차 생산 업체는 물론 미국이나 유럽의 경우 국가적인 차원에서 관심을 가지고 연구 및 기술개발에 힘쓰고 있는 기술이다. 본 고에서는 IEEE 1609.2를 중심으로 V2X 통신 중 보안부분(Security Service)에 대한 설명과 차량을 위한 PKI 시스템 구축 등을 소개하고, 향후 연구 방향에 대하여 논한다.

Isothermal Age-hardening Behavior in the Commercial Dental Au-Ag-Cu-Pd Alloy

김형일,장명익,이유식,Kim, Hyung-Il,Jang, Myoung-Ik,Lee, You-Sik The Korea Society of Medical and Biological Engine 1996 의공학회지 Vol.17 No.2

The relationship between the isothermal age-hardening behavior and the phase transformation in the commercial dental Au-Ag-Cu-Pd alloy was investigated Age-hardening was mostly attributed to the lattice distortions of the supersaturated w phase resulting from the transformation to the metastable phasel which were more distinct at lower aging temperature. The lattice distortions resulting from the transformation of the metastable phases to the equilibrium phases also made a contribution to the age-hardening.

비폐쇄성 무정자증의 치료

서주태,박용석,김종현,이유식,전진현,이호준,손일표,강인수,전종영,Seo, Ju-Tae,Park, Yong-Seog,Kim, Jong-Hyun,Lee, You-Sik,Jun, Jin-Hyun,Lee, Ho-Joon,Son, Il-Pyo,Kang, Inn-Soo,Jun, Jong-Young 대한생식의학회 1997 Clinical and Experimental Reproductive Medicine Vol.24 No.1

Irreparable obstructive azoospermic patients can be treated successfully with microsurgical epididymal sperm aspiration(MESA) or testicular sperm extraction (TESE) by intracytoplasmic sperm injection(ICSI). Obstructive azoospermic patients generally have normal spermatogenesis. The aim of this study was to see if any spermatozoa could be retrieved from non-obstructive azoospermia and to assess the efficacy of ICSI with TESE in germinal failure. 42 non-obstructive azoospermic patients revealed no spermatozoa at all in their ejaculates, even after centrifuge. The histology of 42 patients revealed 15 Sertoli cell only Syndrome, 4 maturation arrest and 23 severe hypospermatogenesis. All patients underwent extensive multiple testicular biopsy for sperm retrieval. These patients were scheduled for ICSI using testicular spermatozoa. In 25 out of 42 non-obstructive azoospermic patients, spermatozoa were recovered from multiple testicular biopsy specimen and 11 ongoing pregnancies were achieved. There are usually some tiny foci of spermatogenesis which allow TESE with ICSI in non-obstructive azoospermia. Also these patients may have sufficient sperm in the testes for ICSI, despite extremely high FSH level and small testes.

여성 요도게실제거술 후 치골질식슬링과 Martius 지방편이식술의 유용성

한거름(Keo Reum Han),이유식(You Sik Lee) 대한임상노인의학회 2002 대한임상노인의학회지 Vol.3 No.4

Purpose: To evaluate the effects of pubovaginal sling (PVS) and Martius labial fat pad interposition (MLFI) upon patients with female urethral diverticulum after diverticulectomy. Materials and methods: Total 23 consecutive cases of urethral diverticulum were reviewed retrospectively. The pre-operative evaluation included a history, physical examination, voiding cystourethrogram, cystoscopy, transperineal ultrasound and urodynamic study to investigate the urethral function and concomitant stress urinary incontinence. Treatment consisted of transvaginal diverticulectomy alone or with PVS only or combined with MLFI. Results: The presenting symptoms were palpable vaginal mass (52.2% of cases), urinary incontinence (52.2%). frequency/urgency (30.4%) and pain (21.7%). All patients were treated with surgical procedure. Transvaginal diverticulectomy alone was performed using a 3-layer closure in nine women (39.1%) and concomitant PVS with diverticulectomy in eight women (34.8%) with stress urinary incontinence. MLFI combined with the above procedure was performed in six women (26.l %) with large defect of urethra after resection of diverticulum. None of the women who underwent diverticulectomy with or without PVS and MLFI had urethrovaginal fistula, recurrent diverticulum or postoperative incontinence. Conclusions: In complicating cases, simultaneous transvaginal diverticulectomy, pubovaginal sling and Martius labial fat pad interposition can be performed safely and effectively.