變斷面 部材의 應力解析

김경찬,장대식 영남이공대학 1972 論文集 Vol.1 No.-

Structural members are frequently given profiles widening toward the endes to enable the members to better resist the negative bending moment prevailing at the joints, and design calculations are usually made on the assumption that they are of uniform section, ignoring the potential effect of variation in sectional demensions. This paper considers the extent of such effect and experimentally definess the limit of the size of some such thickening of sections within which such approximate design procedures may result with sufficient engineering practicability.

合成 Prestressed Concrete 道路橋보의 應力狀態 : 建設部 標準斷面의 解析

金炅燦 慶北工業專門大學 1964 論文集 Vol.1 No.-

The theory of prestressed concrete with the aid of supporting experimental results has developed into a great many structures constructed in the practice thereof. And our government followed this world-wide trend to include in its 1963 edition of Ministry of Construction(MOC) standard plans for Highway Bridge Superstructure a series of Class 1 and 2 composite prestressed concrete bridges of 14-to 30-meter span. Materials comprising prestressed concrete structures are under highly stressed condition even in the absence of live loads and are more sensitive than conventionally reinforced counterparts to the meteorological and geographical change of the site where the structures are to be placed. This paper considers under certain assumptions the stress condition of the beam and analyzes the merit of the forementioned standard plan with some resulting recommendations as to the design and practice thereof.

Extraction of Endobronchial Tooth by Flexible Bronchoscopy Using Fishnet Basket in Patients of Intensive Care Unit with Artificial Airway

김경찬 대한중환자의학회 2014 Acute and Critical Care Vol.29 No.1

Foreign body aspiration into the tracheobronchial tree can cause serious problems. Tooth aspiration can occur during emergency endotracheal intubation. However, removal of a tooth from the airway is difficult because of the round shape and smooth surface of the tooth. Here, I report extraction of a tooth from the airway by flexible bronchoscopy using fishnet basket in intensive care patients. The procedure was performed in six patients. All patients were critically ill with an artificial airway (n = 4; endotracheal tube, n = 2; tracheostomy tube). The tooth location was right bronchial tree in three patients and left bronchial tree in three patients. Tooth extraction failed in two patients because the teeth were impacted in the distal bronchus during bronchoscopy. There was no complication such as life threatening arrhythmia or hypoxemia during the procedure. Using flexible bronchoscopy with a fishnet basket, we were able to extract aspirated teeth from patients with an artificial airway.

木月詩의 韻律論的 考察

金景贊 제주대학교 사범대학 국어교육과 국어교육연구회 1988 白鹿語文 Vol.5 No.-

經濟性을 고려한 桁橋의 徑間算定

金炅燦 嶺南大學校 工業技術硏究所 1975 연구보고 Vol.3 No.1

Employing an extended number of relevant factors, a generalized formula is derived that defines the economical span lengths of given girder bridges: where C: Portion of cost per span of the superstructure regarded independent of span lengths, such as the cost of bearings and expansion joints P: Cost per site of foundation works, including a well or piles(if any) and a pier r : Unit cost of variable components of the superstructure, such as the cost (material, fabrication and handling) of concrete, steel, form and tendons c : Constants comprising a set of linear equation ) that approximate the quantities of variable components m: Number of variables The values of the factors appearing in the formula can be readily obtained: C and P from a trial design using a proposed (preliminary) span length and the current unit costs r , and a matrix of a by least-square fitting the variations of variables with regard to span lengths using the data from three or more of existing (if available) or trial designs of similar design characteristics and different span lengths. Where a design even of a multiple-span bridge of considerable length is summarily developed around a randomly chosen type and span length and "finalized" with no serious efforts made at comparative cost analyses involving the potential alternatives of different types and span lengths, the generalized formula as herein introduced (and applied to sample, modified real-life designs) will hopefully serve the designers and analysts alike.

HL-60 세포에서 $TNF-{\alpha}$에 의한 MCP-1 발현에 미치는 Betulinic Acid의 효과

김경찬,이추희,Kim, Kyung-Chan,Lee, Chu-Hee 대한약학회 2008 약학회지 Vol.52 No.1

Betulinic acid, a naturally occurring pentacyclic triterpenoid, is found in abundance in the outer bark of white birch (Betula alba). In this study, we investigated if betulinic acid affects cytokine expression from activated macrophage cells. ELISA result showed that stimulation of HL-60 cells with proinflammatory cytokine such as $TNF-{\alpha}$ resulted in MCP-1 release into culture medium. In addition, transcriptional upregulation of MCP-1 in response to $TNF-{\alpha}$ was observed by RT-PCR analysis. However, incubation of HL-60 cells with betulinic acid prior to $TNF-{\alpha}$ treatment abrogated MCP-1 expression in transcription and translational level. Consistent with a number of studies which reported requirement of ERK activation for $TNF-{\alpha}$ expression, Western blot analysis showed that $TNF-{\alpha}-induced$ ERK activation was suppressed by pretreatment of HL-60 cells with betulinic acid. Taken together, our data indicate that betulinic acid exerts its anti-inflammatory effect through inhibition of $TNF-{\alpha}-induced$ ERK activation which is required for the subsequent MCP-1 release.

일반화 가법모형을 이용한 인천 지역 오존과 초미세먼지가 천식 악화에 미치는 영향 연구

김경찬,이혜원 한국데이터정보과학회 2022 한국데이터정보과학회지 Vol.33 No.4

We aimed to investigate the association between short-term exposure to air pollution and acute exacerbation of asthma requiring emergency departments (EDs) visit. We identified from the National Health Insurance Service environmental database of Korea 55,961 patients who visited EDs with asthma as a primary cause in Incheon during the period of 2013 and 2017. We estimated exposure to ozone (O3), particulate matter < 2.5 m (PM2.5), particulate matter <10 m (PM10), nitrogen dioxide (NO2), sulfur dioxide (SO2) and carbon monoxide (CO). We conducted a quasi Poisson regression as a time series analysis using generalized additive models to examine the association between air pollution exposure and EDs visit for asthma. We provide evidence that exposure to air pollution may increase the risk of EDs visit for asthma in Incheon. Given our findings, public health interventions to reduce levels of air pollutants including O3 and PM2.5should be conducted.

벌금형 집행 관련 문제점과 개선방안 - 특히 효율적인 벌금형 집행기구의 필요성과 이른바 ʻ벌금형 집행법ʼ 제정과 관련하여 -

김경찬 대검찰청 2021 형사법의 신동향 Vol.- No.72

The aim of this thesis is for the reformation of the system of the monetary penalty through the analysis of the side effect of it in Korea. The object and purpose of the monetary penalty in Korea are not only for the punishment of the minor offense but also it has the function for the confiscation and additional collection including illegal asset recovery. There are some policies for the economical weak about the monetary penalty in Korea. The first, a stay of execution of the monetary penalty under certain conditions. The second, the conversion of the fine to the community service. The third, the divided payments of the monetary penalty. Nevertheless, it is not so much activated for the weak to have a stay of execution of the monetary penalty including the conversion of the fine to the community service or public work in Korea. It is necessary to revise the related laws for the efficient enforcement by evaluating the function of the monetary penalty and establish the effective authority for the fine enforcement. It is also requested to legislate the basis law for the reformation of the monetary system like day-fine system and enact the fine enforcement law for strengthening the law enforcement through the assessment and computation of the property reflected the economic conditions including the mutual assistance of the related authority for the fine enforcement. 한국의 벌금제도는 9가지 형벌 중 가벼운 형벌의 한 종류로 규정되어 있다. 그러나배수 벌금이나 징벌적 성격의 벌금 그리고 범죄수익 박탈이나 환수 성격의 벌금은가벼운 형벌로서의 성격을 잃어버렸다. 또한 개인의 경제적 사정이 어떠한가에 따라벌금은 당사자에게 자유형보다 무거운 형벌이 되거나 또는 가벼운 형벌로서의 기능도사실상 하지 못하는 무의미한 형벌로 변질이 되기도 하였다. 벌금형 집행에서 상당수의 금액이 몰수와 추징에 해당하는 금액으로서 벌금으로표현되어 집행되기도 하고 상당수의 금액이 실제 현금 납입과 같은 금전적 납부보다는 노역장 유치로 대체 집행되거나 또는 순미제액으로 남기도 한다. 따라서 자신의 재산 상황이나 경제적 사정에 부합하는 적절한 금액의 벌금이 부과되고 납부될 필요가 있다. 그러기 위하여서는 벌금제도의 개혁이나 개선과 함께 벌금형집행과 관련하여 보다 투명하고 효과적이며 효율적인 집행이 가능할 수 있는 기구와체계마련이 요청된다. 이와 관련하여 보다 명확한 법적 근거로서 이른바 ‘벌금형 집행 법’이 필요하다. 벌금형 집행유예의 활성화 문제, 황제노역을 막는 문제, 노역장 유치보다는 사회봉사나 공공근로를 확대하는 문제, 대체자유형을 가급적 줄이거나 폐지하는 문제 등이자신의 경제적 상황과 관련하여 벌금부과절차나 집행절차에서 소명되거나 확인될필요가 있다. 이는 국민의 권리와 의무에 직접적인 영향을 미칠 수 있는 것으로 관련법적 근거를 명확하게 마련하고 이를 수행할 수 있는 기구와 체계를 정비할 필요가있다.

중부권역의 겨울철 및 여름철 대기 중 HONO, HOx, NOx, O₃의 분포특성

김경찬,이상준,최다영,엄지원,이수빈,김정호,한진석 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10

대기 중에 분포하는 HONO는 이른 오전 시간에 광분해하여 OH 라디칼을 생성하는 주요 공급원이다. 생성된 OH 라디칼로 인해 오존은 HONO가 광분해되는 시점부터 그 농도가 상승하여 늦은 오후에 피크점을 나타내는 특성이 있다. HONO의 측정에는 PPDS-IC시스템을 이용하였다. PPDS (Parallel Plate Diffusion Scrubber)는 기체-액체의 농축비가 매우 높아 대기중 수 pL/L의 낮은 농도까지 검출이 가능하며, 기체만 선택적으로 측정할 수 있는 장점을 갖고 있다. 측정은 약 1개월 동안 진행하였고, 측정 데이터는 1시간 간격으로 연속측정하였다. OH 라디칼은 LIF (Laser-Induced Fluorescence) 스펙트로메터를 사용하여 직접 측정이 가능하지만, 측정 장비가 고가이고 운영의 어려움이 있어, 본 연구에서는 OH 및 HO₂ 라디칼을 F0AM 모델을 이용하여 계산하였다. F0AM(Framework for 0-dimension Atmospheric Modeling) 모델은 주로 산림지역 식생에서 배출되는 VOCs의 산화반응을 모사하기 위한 구조를 사용하는 0차원 상자 모델(Box model)이며, 도시지역에서 발생하는 광화학 반응의 모사 또한 가능한 도구이다. 중부권역에서 측정한 대기 중 HONO, 질소산화물(NOx), O₃ 데이터와 F0AM모델을 사용하여 계산한 HOx 라디칼 농도수준을 통하여 일반적 농도수준과, 겨울철과 여름철의 계절적 농도분포특성을 파악하였다.

InAs 양자점 구조 변화에 대한 레이저 다이오드 선폭 증가 요소 연구

김경찬,장동기,김태근,이정일,한일기 한국진공학회 2009 한국진공학회 학술발표회초록집 Vol.37 No.-