물류산업과 화물자동차운송산업의 비용구조와 효율성 분석에 관한 연구

권혁구,하헌구 한국교통연구원 2016 交通硏究 Vol.23 No.1

This study aims to analyze the cost structure and efficiency of the logistics and trucking industries of Korea. For this purpose, the basic data framework of the logistics sector was composed of input-output with micro-data from the freight sector. Analysis methodologies used the translog cost function and the stochastic frontier model. The former analyzes economies of scale, demand elasticity, and cross-elasticity, while the latter identifies the relative inefficiency. Economies of scale exist in the logistics industry but not in the trucking industry. In addition, the cross-elasticity of the logistics industry has substitution characteristics, but the trucking industry has complementary characteristics in some input items. In the efficiency analysis, the logistics industry is influenced by the international and domestic economy but the trucking industry is more efficient because of the domestic demand oriented market structure and regulatory aspects barring market entry. 화물자동차운송산업은 물류산업에서 가장 많은 비중을 차지하는 분야로서, 비용구조와 효율성분석을 통해 두 산업을 비교하고자 한다. 물류산업에 대해서는 산업연관표 자료를 이용하였고, 화물자동차운송산업은 운수업조사보고서 자료를 활용하였다. 분석방법론은 비용함수를 이용하여 규모의 경제, 수요탄력성, 교차탄력성 등을 분석하였고, 확률적 프론티어 모형을 활용하여 상대적 비효율성을 파악하였다. 비용함수에서 물류산업은 규모의 경제가 있는 반면에 화물자동차운송산업은 규모의 경제가 없다고 나타났다. 또한 물류산업의 교차탄력성은 모두 대체재의 특성을 지니고 있으나 화물자동차운송산업은 일부에서 보완재 특성을 나타내 대조를 보이고 있다. 효율성 분석에 서는 물류산업의 경우 경쟁구조 심화에 따른 효율성 개선보다는 대내외 경제의 영향을 받아 비효율성이 증가하는 구조이나 화물자동차운송산업은 시장진입규제와 더불어 내수 중심의 시장구조로 효율성이 향상되는 것으로 나타났다.

Rhodotorula rubra의 항원특성에 관한 연구

권혁구,이장훈,염곤 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.5

Antigenicity of Rhodotrula rubra isolated from pulmonary tissue of pulmonary tuberculosis patients was studied by means of agglutination reaction with R. rubra whole cell antiserum. And the serological reactivity of crude polyfac charide from R. frubra, Candida albicans, Candida tropicalis, Candida, glabrata, and Saccharomyces cerevisiae ATCC 26603 with antiserum to R. rubra whole cell was studied by means of immunodiffusion test. R. rubra showed stationary phase after 48h when it was cultured in GYEP broth. While agglutinogen titer was 1:64 at lag phase, agglutinogen titer was 1 :256 after 20h. After growth of R. rubra on different 11 media, nutritional environment showed similar agglu-tination reartivity. The agglutinogen titer of C. albicans, C. tropicalis, C. giabrata, which were isolated from patient s expectoration, to R. rubra antiserum by means of agglutination reaction were 1:16, respectively. But, Sacch. cervisiae ATCC26603 was negative. Those results were lower than that of R. rubra agglutinogen titer 1:256. As a result of immu-nodiffusion test with crude polysaccharide extracted from cell wall of R. rubra, C. albicans, C. tropicalis, C. glabrata, Sacch. cervisiae ATCC26603, precipitin line was found only with R. rubra, of which antibody titer was 8.

ECM 모형을 이용한 지역별 도로교통사고 비교분석

권혁구,국우각(Guk, U-Gak),강경우 대한교통학회 2001 대한교통학회 학술대회지 Vol.40 No.-

항진균성 활성물질을 생성하는 토양방선균의 분리

권혁구,강병곤,이장훈 한국환경독성학회 2003 환경독성보건학회지 Vol.18 No.2

Anti-fungal materials producing bacteria were isolated from soil by bennett's agar and actinomycete isolation agar medium. The bacteria were identified as synonym of Actinomycetes. Based on the data obtained from its morphological and colony characteristics. The medium for production of anti-fungal materials was YEME (yeast extract 4g, malt extract 10g, glucose 4g, D.W 1l, pH 7.0±0.2). The culture conditions were 30℃, 7 days and 200 rpm in shaking incubator. No.13, No.15 and No.28 strains were produced anti-fungal materials against fungal plant pathogens. Specially, The No. 28 strain showed a powerful biopesticide activity and broad spectrum effects of anti-fungal materials on Collectrichum coccodes, Botrytis cinerea, Ciadosporium cucumerinum, Didvmella bryoniae,.

도시첨단물류단지 개발과 물류경쟁력 강화 방안

권혁구,Gwon, Hyeok-Gu 대한교통학회 2016 교통 기술과 정책 Vol.13 No.3

유기성 폐기물의 발생 악취 제거를 위한 Delftia sp.의 성장조건 최적화

권혁구,정준오,추덕성,이장훈,Kwon, Hyuk-Ku,Jung, Joon-Oh,Chu, Duk-Sung,Lee, Jang-Hoon 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.5

We isolated and identified a microorganism which was excellent for ammonia oxidation in the biological control of ammonia gas in odor producing materials from organic composting. The isolated strain was tested for growth characteristics and ammonia elimination efficiency under various conditions of temperature, pH, carbon concentration and ammonia concentration. The strain was isolated from a culture broth used in a $NO_2$ producing test with Griess-Ilosvay reagent. The results of 16S rRNA sequence from the isolated strain by using BLANST (Basic Local Alignment Search Tool) and confirming RDP (Ribosomal Database Project II) and ERRD (The European Ribosomal RNA Database) indicate that the strain is related to Delftia sp. UV-Spectrophotometer (Shimadzu, UVmini-1240) was used as a microbial growth test by measuring turbidity on OD660nm and ammonia concentration was measured by Spectrophotometer (HACH, DR-4000). The optimum growth culture conditions of the ammonia oxidizer Delftia sp. were $30^{\circ}C$, pH 7, glucose concentration 1.00% and $(NH_4)_2SO_4$ 0.5 g/l. Ammonia elimination efficiency was over 94% under the same conditions.

화물기반모형과 트럭통행기반모형의 통행거리분포 분석에 관한 연구

권혁구,임홍상,김건영,강경우 대한교통학회 2002 大韓交通學會誌 Vol.20 No.2

도시화물수요예측모형에는 화물기반모형과 트럭통행기반모형이 있는데 화물기반모형은 화물체계가 기본적으로 화물운송과 관계가 있다는 개념에 기초를 두고 있으며, 차량이 아닌 화물의 움직임을 주요 분석 대상으로 삼고 있다. 반면에, 트럭통행기반모형은 집합화된 독립변수를 이용하여 각 죤(Zone)에 유 · 출입하는 트럭의 통행을 분석하는 것이다. 본 연구의 목적은 트럭통행기반모형의 O-D 추정시 화물통행과 트럭통행 사이의 관계식을 산출하고 이를 설명할 수 있는 통행거리분포함수(Trip Length Distribution : TLD)를 추정함에 있다. 본 연구의 자료는 교통개발연구원에서 수행한 ‘서울시 물류조사 및 물류종합계획수립구상(1998)’의 화물 물동량 조사자료를 이용하였으며, 이를 통해 통행거리분포에 따르는 화물 및 차량의 비율을 함수로서 나타내었다. 본 연구를 통하여 트럭통행기반모형에서 트럭통행거리분포를 이용하여 화물기반모형에서 도출할 수 있는 화물의 통행거리분포를 추정할 수 있었으며, 또한 각각의 통행거리분포는 감마분포를 이용하여 함수식으로 도출하고 상기한 두 가지 분포모형을 하나의 관계식을 통해 재산정할 수 있는 이론적인 틀을 제공하였다는데 의의가 있다고 하겠다. 트럭통행거리분포, 화물통행거리분포 모두 통계적인 검증을 통해 적합한 것으로 분석되었으며, 전체화물의 통행거리분포와 매개함수를 통해 재산정된 모형의 결과 값 또한 통계적으로 유의하였다. 품목별 적용에서는 잡공업품과 화학공업품은 본 연구의 매개함수식을 통해 화물거리분포 모형이 적합하였으나, 금속공업품과 경공업품은 다소 차이가 있는 것으로 분석되었다.

가축 분변중의 항생제 내성균주의 분포에 관한 연구

권혁구,이장훈,김종규,Kwon, Hyuk-Ku,Lee, Jang-Hoon,Kim, Jong-Geu 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.2

Objectives: To estimate the multi-antibiotic resistant bacterial contaminant load discharged from livestock farms, we randomly selected livestock farms specializing in cattle, swine, and fowl and collected bacterial strains from domesticated animal feces and compost samples. Problems with resistance to antibiotics are becoming worldwide issues, and as the consumption of antibiotics appears to be excessive in Korea as well, the emergence of antibiotic resistant bacteria shows the possibility to cause potentially serious social problems. Methods: To monitor multi-antibiotic resistant bacterial constituents, aerobic bacteria and Escherichia coli were isolated from domesticated animal feces and compost. Antibiotic resistance testing was performed by the disc diffusion method using 13 different antibiotics. Results: Examining the degree of sensitivity to antibiotics of the aerobic bacteria originating from domesticated animal feces, fowl feces showed the highest distribution rate (35.5%), followed by swine feces compost (23.1%), swine feces (18.2%), cattle feces (14.9%), and cattle feces compost (8.2%). Antibiotic resistance tests of aerobic bacteria and E. coli originating from domestic animals feces resulted in 83.6% and 73.5% of each strain showing resistance to more than one antibiotic, respectively. Conclusions: These results suggest that increasing multi-antibiotic resistant bacteria in the environment has a close relation to the reckless use of antibiotics in livestock.

암모니아산화세균 Brevundimonas diminuta의 분리 및 암모니아 산화 특성

권혁구,정준오,Kwon, Hyuk-Ku,Jung, Joon-Oh 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4

The microorganism for ammonia gas removal was isolated from composting product. This was identified as Brevundimonas diminuta by morphological, biochemical characteristics study and 16S rDNA sequence analysis. Optimal incubation temperature for cell growth and oxidizing ability of $NH_4-N$ was $30^{\circ}C$ and optimal initial pH was 7. Glucose affected the growth of cell and the removal of $NH4^+$. The growth rate of the isolates were increased when grown in the presence of 0.05-1%(w/v) glucose in the selective medium and lurker increases in glucose concentration to 2% caused significant decreases in the cell growth and oxidizing ability of $NH4^+$.

시계열 자료를 이용한 교통사고 분석

권혁구,방현석,강경우 대한교통학회 2000 대한교통학회 학술대회지 Vol.38 No.-