플레이트거더의 전단강도

최취경,김태영,서성연,김정석,김상섭,김규석 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

In the design of plate girder web panels, it is required to evaluate accurately the elastic buckling strength under pure shear. Whether or not the post-buckling strength is accounted for. Currently. Elastic shear buckling coefficients of web panels stiffened by transverse intermediate stiffeners are determined by assuming conservatively that web panels are simply supported at the juncture between the flange and the web. Although the notion of the real boundary condition at the juncture of the web and flanges to be somewhere between simple and fixed has been recognized from early days, the boundary condition has been conservatively assumed. Mainly due to lack of means to evaluate it in a rational manner. In this paper. A series of numerical analyses based on a three-dimensional finite element modeling is carried out to investigate the effects of the geometric parameters on the boundary conditions at the juncture between the flange and the web.

풍하중에 의한 단요철 구조물의 동적특성

최취경 경원전문대학 2000 論文集 Vol.22 No.-

This paper examines dynamic characteristics along wind load for the structure shaped concave section. Wind tunnel test had been conducted with two-degree of freedom aeroelastic model. These results will be helpful to compare with dynamic response of structures which have various section shapes.

Hemann Broch의 "Die Schlafwandler" 硏究

趙哲濟 慶北大學校 師範大學 1976 敎育硏究誌 Vol.18 No.-

국내 조혈모세포이식 환자에서 Human Cytomegalovirus gB 유전형의 분포와 질환과의 연관성 : 예비 보고

최수미,김진희,이동건,박선희,최정현,유진홍,박철민,이종욱,민우성,황응수,신완식,김춘추 대한감염학회 2007 감염과 화학요법 Vol.39 No.2

목적 : 사람 거대세포바이러스(Human cytomegalovirus, 이하 HCMV) glycoprotein B (gB)는 UL55 유전자에 의해 부호화되는 당단백으로, UL55 유전자의 염기서열변화에 따라 4가지 유전형으로 나뉜다. 본 연구에서는 국내 조혈모세포이식 환자들에서 HCMV gB 유전형의 분포와 그 특성을 알아보고, gB 유전형에 따라 특정 HCMV 질환 발생과 연관이 있는지 그 임상적 의미를 분석해 보고자 하였다. 재료 및 방법 : 동종 조혈모세포이식 환자 52명의 혈액검체 94개에 대해, Chou 등이 제시한 방법에 따라, 먼저 UL55 유전자 부위를 nested PCR로 증폭한 후, RsaI과HinfI으로 Restriction fragment length polymorphism(RFLP) 분석을 시행하였다. 결과 : gB type 1은 73.1% (38/52), gB type 2는 13.5%(7/52), gB type 3는 1.9% (1/52), gB type 1과 type 2에 의한 혼합감염은 9.6% (5/52)로 나타났다. gB type 4는 관찰되지 않았다. 1명(1.9%)에서 gB 유전형을 결정할 수 없었는데, RFLP 패턴으로 보아 Trincado 등이 제시한 gB type 7에 해당하는 것으로 생각되었고, 이 새로운 아형에 대해서는 현재 염기서열 분석 중이다. 52명 중 5명(9.6%)에서 HCMV 질환이 발생하였고, 3명에서 HCMV 폐렴, 1명에서 망막염과 위장관염, 나머지 1명에서 망막염이 발생하였다. 5명 중 HCMV 질환과 관련하여 사망한 예는 없었고, 감염된 HCMV는 모두 gB type 1이었다. HCMV gB유전형과 HCMV 질환 발생 사이에 유의한 연관성은 없었고, 단일 주에 의한 감염과 혼합감염에 따른 HCMV 질환발생 사이에도 유의한 연관성은 관찰되지 않았다. 자료 분석 중 gB type 2에 감염되어 있던 환자에서 gB type 1에 재감염 되면서 발열, 간효소 수치 상승 및 pp65 HCMV 항원혈증이 나타난 예가 있었다. 결론 : 연구결과 gB type 1이 아주 우세하고, gB type 4는 검출되지 않았으며, 혼합감염의 빈도가 비교적 낮은 분포를 보였다. 이는 외국의 보고와는 다른 국내 조혈모세포이식 환자에서의 독톡한 감염 양상으로 추정된다. 본 연구에서 HCMV gB 유전형과 질환 발생과의 연관성을 밝힐 수는 없었으나, HCMV 유전형에 대한 연구는 바이러스 감염의 발병기전이나 전파 경로 및 양식과 같은 역학적 연구에 중요한 자료가 될 것이다. 현재 더 많은 수의 조혈모세포이식 환자를 대상으로 연구가 진행 중에 있으며, 앞으로 다른 질환군의 환자나 건강한 잠복 감염자에서의 추가 연구가 필요할 것으로 생각된다. Background : Human cytomegalovirus (HCMV) glycoprotein B (gB) is the major envelope glycoprotein, encoded by the UL55 gene. Based on sequence variation in the UL55 gene, HCMV can be classified into four gB genotypes. Previous studies have suggested an association between HCMV gB genotypes and clinical outcome in the immunocompromised hosts. The goal of this study was to determine the distribution of HCMV gB genotypes and the effect of gB genotype in the developement of HCMV diseases in hematopoietic stem cell transplant (HSCT) recipients in Korea. Materials and Methods : DNA was extracted from 94 blood specimen of 52 allogeneic HSCT recipients with HCMV infection. HCMV gB genotype was determined using polymerase chain reaction to amplify a region of UL55, followed by restriction fragment length polymorphism (RFLP) analysis based on RsaI and HinfI digestion. Results : The distribution of gB types were as follows: gB1, 73.1% (38/52) of patients; gB2, 13.5% (7/52); gB3, 1.9% (1/52) and mixed infection (gB1 and gB2), 9.6% (5/52). While gB4 was not detected, a new genotype (described as gB7 by Trincado et al, 2000) was identified on the basis of their RFLP pattern. During average 708 days’ follow up period, HCMV diseases developed in 5 patients. All of them had gB1 genotype. There was no statistically significant association between the incidence of HCMV diseases and the gB genotypes. Re-infection with gB1 strain was detected in one patient who had been previously infected with gB2. This episode was associated with fever, elevated liver enzyme and positive antigenemia. Conclusion : HCMV gB1 was the dominant genotype and no gB4 was detected in allogeneic HSCT recipients in Korea, which is an unique pattern compared with the previous reports. Although we can not find significant association between the HCMV diseases and the gB genotypes, genotyping of HCMV will serve in the study of pathogenesis and transmission of this virus in transplant patients. Further study is underway with large study population.

Social Quality and the Social Harmony Campaign in Hong Kong

CHUI-MAN RUBY CHAU,WAI-KAM SAM YU 서울대학교 사회발전연구소 2009 Journal of Asian Sociology Vol.38 No.2

This paper is a response to the increasing internationalization of the concept of social quality. It is intended to examine whether research projects on social quality reduce or increase the ethnocentric bias in the study of social welfare. To fulfill this objective, it carries out two analytical tasks. The first is to discuss the views of Walker and Wong (2004) on the ethnocentric bias in the study of social welfare. Walker and Wong (2004) argue that overemphasizing the differences between how social welfare is organized and assessed in Western countries and that in non-Western countries causes the bias of excluding the latter in comparative analyses. Hence to deal with this bias, it is necessary to pay attention to the similarities between the social welfare development in western countries and that in nonwestern countries. Secondly, to provide evidence to Walker and Wong’s argument, this paper discusses the relevancy of the social harmony campaign in Hong Kong to research projects on social quality.

Practice of Green life - Carbon Point

Chui-Min Lee 한국환경경영학회 2010 한국환경경영학회 학술대회 Vol.2010 No.-

참깨 開花ㆍ登熟에 關한 硏究11, 草型 別 發育에 따른 光合成 및 關聯 特性 差異

Chui Whan Kang(姜哲煥),Byung Chan Chung(鄭柄贊),Jung Sik Suh(徐貞植) 한국육종학회 1994 한국육종학회지 Vol.26 No.3

Studies were performed to investigate the difference in photosynthesis and related characteristics according to different plant types;growth stage and leaf position in sesame. Three different plant-type varieties were selected from Korean recommended sesame cultivars and used as materials. Average photosynthesis during whole growing period was 1.64 CO₂ ㎎/d㎡/hr. Few-branched type variety “Kwangsankkae” showed 2.006 CO₂ ㎎/d㎡/hr which was the highest one among three plant types. Upper part leaves at maturing stage showed the highest photosynthesis and the next followed with the order of middle part leaves at maturing stage;and leaves of seedling stage. Average chlorophyll content of single leaf through the whole growing period was 3.31 ㎎ per 100㎠ of leaf area(LA) and was highest in few-branched type variety “Kwangsankkae”. Upper part leaves at maturing stage showed the highest chlorophyll content of 4.39 ㎎/100 LA. Average area of single leaf through the whole growing period was 16.5㎠. Middle part leaves at maturing stage in branched type variety “Hansumkkae” showed the highest chlorophyll content among plant types and growing stages. Average specific leaf weight(SLW) during the growing period was 0.0033. The upper part leaves at maturing stage in branched type variety “Hansumkkae” revealed the heaviest one. Average specific leaf area(SLA) during whole growing period was 275 and was highest in the leaves of non-branohed type variety “Danbaeckkae” at seedling stage. Dry weight ratio;SLW and chlorophyll content were positively associated with photosynthesis;while leaf area;fresh and dry leaf weight were negatively correlated with photosynthesis.

Use of the Fix and Flap Approach to Complex Open Elbow Injury: The Role of the Free Anterolateral Thigh Flap

Chui, Christopher Hoe-Kong,Wong, Chin-Ho,Chew, Winston Y.,Low, Mun-Hon,Tan, Bien-Keem Korean Society of Plastic and Reconstructive Surge 2012 Archives of Plastic Surgery Vol.39 No.2

Background : Complex elbow injuries with associated nerve, muscle, or joint injury commonly develop post-inury stiffness. In order to preserve function, joint congruency, elbow stability and durable wound coverage must be achieved in a timely manner. Methods : A retrospective review of patients who underwent orthopaedic fixation followed by free anterolateral thigh (ALT) flap soft tissue coverage was performed. Five patients were identified and included in this study. Results : We present a series of 5 cases managed with this principle. Soft tissue defects ranged in size from $4{\times}9cm$ ($36cm^2$) to $15{\times}30cm$ ($450cm^2$) and were located either posteriorly (n=4) or anteriorly (n=1). Associated injuries included open fractures (n=3) and motor nerve transection (n=2). Wound coverage was achieved in a mean duration of 18.8 days (range, 11 to 42 day). There were no flap failures and no major complications. The mean postoperative active elbow motion was $102^{\circ}$ (range, $45^{\circ}$ to $140^{\circ}$). Conclusions : In our small series we have highlighted the safety and utility of using the free ALT flap in complex elbow injuries. The ALT flap has many advantages which include abundant skin and subcutaneous tissue; vascularised vastus lateralis muscle that was used in our series to obliterate dead space, provide a vascular bed for nerve grafts and combat infection; and, access to fascia lata grafts for reconstruction of the triceps tendon.

Development of a Comprehensive Instrument for Measuring Individual IT Competency in an Enterprise IT Environment

Chui-Young Yoon(윤취영) 한국인터넷전자상거래학회 2013 인터넷전자상거래연구 Vol.13 No.4

정보기술의 발전과 함께 대부분의 기업은 효율적 경영활동과 성과 향상을 위해 정보기술(IT)을 기반으로 한 경영환경을 구축해 왔다. 이러한 정보화환경에서 개인의 효율적 업무수행을 위해 개인의 정보기술(IT) 역량을 측정하고 관리하는 것은 기업의 업무성과 향상과 경쟁력 강화에 매우 중요하다고 할 수 있다. 그러나 기존연구에서는 특정관점의 개인 IT 능력을 측정하는 툴의 개발에 대한 연구는 수행되었으나 총체적인 관점에서 개인 IT 능력을 측정하는 도구에 대한 연구는 이루어지지 않았다. 본 연구는 기업 정보기술(IT) 환경에서 근무하는 개인의 정보기술(IT) 역량을 총체적인 관점에서 효율적으로 측정할 수 있는 포괄적인 도구를 개발한다. 이를 위해 기존 연구에서 개인 정보기술(IT) 역량을 측정하기 위한 최초 25 개의 측정항목을 개발하며, 개발된 측정항목을 기반으로 요인분석, 신뢰성 분석, 그리고 구조적 타당성 분석 등을 통하여 적합한 15 개의 측정항목, 4 개의 측정요인, 그리고 측정도구의 구조를 제시한다. 개발된 측정도구는 실제 정보기술 환경의 기업에 근무하는 인력에 적용하여 그 분석 결과를 제시함으로써 그 활용성을 확인한다.

Relevance of Sources of Finance to Patent

Chui, Ah Ram(최아람) 한국국제회계학회 2021 국제회계연구 Vol.- No.99

[연구목적] 4차 산업혁명 시대에 기술혁신은 기업의 장기적 성공을 위한 가장 중요한 요소 중 하나로 간주되고 있다. 기술혁신을 측정하는 지표로는 기업의 연구개발비 투자가 다수의 선행연구에서 사용되어져 왔다. 하지만, 이러한 기업의 연구개발 비용의 지출은 매출향상이나 이윤의 증가로 이어지기기까지 장기간 관찰이 필요하거나 이 둘의 경제적 상관관계를 판단하는 것은 어렵다. 따라서, 본 논문은 기업의 혁신활동 측정을 미국의 상위 300대 특허등록 기업 리스트 선정 여부로 사용하고 기업의 외부 및 내부의 금융조달이 특허등록에 미치는 영향을 연구하고자 하였다. [연구방법] 본 연구를 위해 2017년부터 2019년까지 미국 NYSE와 NASDAQ 상장회사의 재무자료를 Osiris 데이터베이스에서 수집하여 로지스틱 회귀분석을 실시하였다. 나아가 기업규모에 따라 금융조달이 특허등록에 미치는 영향이 다를 것을 예상하여 기업규모를 나누어 분석을 실시하였다. [연구결과] 본 연구의 결과를 요약하면 기업의 특허취득활동은 내부 금융 및 외부 자금 조달 상황에 의해 유의한 영향을 받는 것으로 나타났다. 먼저 내부 금융조달을 살펴보면, 기업의 제한된 내부 현금 상황은 특히 규모가 작은 기업에서 기술혁신 성과가 유의하게 높게 나타나는 음(-)의 상관관계를 나타냈다. 이는 기업의 혁신활동의 산출물인 특허를 통해 미래에 유입될 기업의 이익을 취득하려는 노력이 반영된 것으로 간주된다. 또한, 기업들은 일반적으로 외부 금융(대출 등)을 활용하여 혁신활동을 조달하는 것으로 나타나 외부금융과 특허취득은 유의한 양(+)의 상관관계를 보였다. [연구의 시사점] 본 연구는 최근 기술혁신에 대한 연구가 활발히 진행되는 가운데 기술혁신의 측정치로 특허등록 기업 리스트를 사용했다는 점과 금융조달 방법에 따라 특허등록에 미치는 차별적인 영향을 제시했다는 점에서 의의가 있다. 그러나, 정보부족으로 기업의 혁신 활동의 질적 특성이 고려되지 못하였다는 점과 제한된 표본의 크기는 본 연구의 한계로 간주된다. [Purpose] Innovative performances are once of the most critical factors for a firm"s long-term prosperity. R&D expenditures are used as an indicator to measure a firm"s innovated activities in many previous researches. However, due to the time lag exist between the incurrence of R&D expenses and increases in profit, it has been difficult issue to judge the economic outcome of R&D expenses. For that reason, this paper aimed to measure a firm"s innovative performances with U.S utility patents granted and tried to exam the relevance of sources of finance (external and internal) to patent probability. [Methodology] Accounting data of NYSE and NASDAQ traded U.S. firms as well as for sub-samples of small and large firms divided by the size, taken from the BvD"s Osiris database, are collected over the 2017 to 2019. We performed a logistic regression analysis for the sample groups. [Findings] Empirical evidence explained that firms’ propensity to patent is significantly affected by both internal and external financing. As for an internal finance, limited operating cash flow of the sample firms resulted in higher innovative performances as measured by patents granted. This result indicates that firms with lower level of operating cash flows have high incentives to fund innovative projects to generate future profits. On the other hands, positive correlation was exhibited between external financing and patents signaling that companies utilize debt (bank loans, trade credits, etc.) financing to back their innovative projects with an exception of small firms which have limited ability to access external finance resources. [Implications] This study contributes to the recent studies by utilizing U.S. top 300 utility patents list as a measurement of firm"s innovative output and conducted empirical researches using internal/external financing as contributing factors of innovation. However, the fact that considering only quantitative aspect of innovative performance (i.e. number of patents granted) and presenting a limited sample sizes are considered as limitations for this study.