동북아 피더네트워크의 Win-win전략에 관한 연구

장우준(Woo-jun jang),전찬용(Chan-Yong jeon),김태원(Tae-Won Kim),곽규석(Kyu-Seok Kwak),남기찬(Ki-Chan Nam) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

최근 중국은 양산항을 개장하여 선사 유치를 위한 다양한 혜택을 제공하고, 일본은 "수퍼중추항만 육성계획“을 세워 항만의 효율성을 바탕으로 비용을 낮추려는 노력을 하고 있다. 또한 선박의 대형화에 의한 중심항만(Hub Port) 위주의 기항과 북중국의 대량 물량 발생지역에 대한 직기항 경향으로 동북아 항만간의 경쟁이 더욱더 치열해 지고 있으며 동북아 역내 피더네트워크 강화의 필요성이 제기되고 있다. 따라서, 본 연구에서는 유럽 피더네트워크 전략 사례를 바탕으로 동북아 피더시장 현황을 파악하고 동북아 피더네트워크 구조를 분석함으로써 동북아 역내 항만 및 선사간의 과당경쟁을 지양하고 서로 Win-Win할 수 있는 터미널의 전략적 활용, 선사간 제휴 확대, 항만간 협력 강화를 위한 구체적인 전략을 제시하였다. Recently, China opened Yangshan port and provides a variety of benefits for shipping companies. Japan plans to reduce logistics costs and improve efficiency through the established "super major ports" project. According to the "hub and spokes" system, the number of direct calls toward North-Chinese ports are increasing. This changing environment has negative effects on the amount of transshipment cargos in Korean ports. In order to make a hub port of a domestic port, it is necessary to develop northeast Asian feeder networks. Therefore, this paper analyzes the structure of northeast Asian feeder networks through the case study of European feeder networks strategy. Finally, we suggests the plans to reinforce feeder networks, which are strategic terminal operation, strategic alliances between shipping companies and port co-operation, for win-win strategy in the competitive northeast Asian market.

간세포암과 감별이 어려웠던 악성중피종 치험 1예

김선문,허원석,채경훈,강윤세,정재훈,김연수,박기오,문희석,이엄석,김석현,성재규,이병석,이헌영,신경숙,조준식,송인상,강대영 충남대학교 의학연구소 2003 충남의대잡지 Vol.30 No.2

Malignant peritoneal mesothelioma is a rare neoplasm that arises from the mesothelium of a serosal cavity and is a rapidly fatal disease with a median survival of 4 to 12 months for untreated cases. Recently, we experienced a case with malignant peritoneal mesothelioma who was suspected hepatocelluar carcioma by abdominal CT scan and was confirmed by biopsy including immunohistochemical stain(calretinin) after surgery. We performed tumor excisions and wedge resection of the liver(segment Ⅷ)and inserted Tencoff catheter in abdominal cavity at 25th day of post-operation. We treated with intraperitoneal paclitaxel(25mg/m^(2)/day for 5 days) six courses monthly. She was well tolerable and is still living without any evidence of recurrence for 14th month of post-operation.

탄력과 비탄력 골반압박벨트 적용이 요통군과 비요통군에 고관절 신전근 근력과 다리들기 어려움 수준에 미치는 영향

박석현,김기원,김병태 대전대학교 기초과학연구소 2019 自然科學 Vol.30 No.-

This study compared the effects of two types of pelvic compression belts on hip extensor muscle strength and leg raise heaviness in individuals with and without low back pain. Subjects with (n=15) and without low back pain (n=45) were enrolled in this study. The degree of subjectively perceived heaviness during prone hip extension (PHE) test was measured on a 6-point scale. The isometric strength of the hip extensor muscles was measured with 20°of PHE and the knee in full extension. Muscle strength was measured before the use of the pelvic compression belt, and then after the use of elastic and non-elastic pelvic compression belts in random order. All measurements were made on the side that the subject perceived as having greater difficulty during PHE. Using descriptive analysis and repeated-measures analysis of variance, we compared the effects of pelvic compression belt use on hip extensor muscle strength in individuals with and without low back pain. There were no significant differences in hip extensor strength and leg raise heaviness level between subjects with and without low back pain with the use of the two types of pelvic compression belts. With the use of the two types of pelvic compression belts, hip extensor strength was significantly increased in both subjects (p<.01). There was no significant difference between the two types of compression belts concerning the effect on hip extensor strength. Both elastic and non-elastic pelvic compression belts helped to improve hip extensor strength in individuals with low back pain

Polystyrene Beads를 사용한 경량 폴리머 시멘트 모르타르의 기초적 성질

연규석,신영수,이윤수,이기원,황진하 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-

polystyrene beads를 사용한 경량 시멘트 모르타르의 성질을 개선하기 위해 EVA혼화용 폴리머를 첨가한 모르타르를 제조하여, 물리ㆍ역학적 성질을 살펴보았던 바 polystyrene beads 골재 재부의 공극 때문에 높은 공기량을 보였고, 플로우 값은 폴리머-시멘트비 10%에서 가장 높은 값을 나타냈다. 또한 폴리머-시멘트비가 증가할수록 압축강도와 휨강도는 증가하였고, 시멘트-경량골재비가 낮을수록 압축강도는 증가하였으나, 휨감도에는 크게 영향을 주지 않았다. The objective of this study was to improve performance of lightweight polymer cement mortars by treating with redispersible polymer powders. Lightweight polymer-cement mortars were prepared with respect to different polymer-cement ratios, and tested for water absorption, specific gravity, flexural and compressive strengths, workability and freeze-thaw resistance. Manufactured lightweight polymer-cement mortars in this study showed lower specific gravity and lower thermal diffuseness than ordinary cement mortars. Water absorption, specific gravity, flexural, compressive strengths and workability were measured according to appropriate KS test methods. As a results, the optimum mix ratios for cement-aggregate, polymer-cement, and water-cement were found to be 1:3, 10% and 30%, respectively.

미세 가공된 정전용량형 초음파 탐촉자의 막 운동 모델링 및 분석

김기복,안봉영,박해원,김영주,김국진,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

In this study, theoretical analysis and finite element analysis of the behavior of membrane (such as resonance frequency, membrane deflection, collapse deflection and collapse voltage)in thc capacitive micromachined ultrasonic transducer (cMUT) were performed. The design parameters of the cMUT were estimated and are the dimension and thickness of membrane, thickness of sacrificial layer, thickness and size of electrode, size of active element and so on. The resonance frequency of the membrane increased as the thickness of the membrane increased but decreased as the diameter of the membrane increased. The deflection of the membrane increased as d-c bias voltage increased. The collapse voltage of the membrane was predicted.

5.7GHz에서의 무선 ATM 서비스를 위한 다중경로 전파 특성

송기홍,최석,김원호 동의공업대학 1998 論文集 Vol.24 No.1

In this paper, we propose an analysis of multipath propagation characteristics for a wireless ATM with l00MHz bandwidth at 5.7GHz, by using data coming from measurements and simulations. Multipath propagation characteristics such as excess delay time, rms delay spread, the number of multipath waves, and transmission losses are investigated. The simulations are performed for line of sight(LOS), non line of sight(NLOS) cases, dimensions of buildings, and separation distances between transmitting and receiving antennas by using a ray tracing program. The accuracy of simulations is examined by comparing the results with measurements.

Mg이 흡착된 Si(111)7×7 표면 재배열 구조

안기석,여환욱,이경원,이순보,박종윤 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1

Si(111)7×7 위에 Mg을 흡착시켜 표면 구조의 변화를 RHEED(Reflection High Energy electron Diffraction)와 XPS(X-ray Photoelectron Spectroscopy)를 이용하여 연구하였다. RT∼200℃까지의 기판온도에서 증착량의 증가에 따라 표면구조는 7×7에서 diffused 1×1, 그리고 2√3/3×2√3/3-R30° 구조로 변화하였다. 이를 thermal annealing하여 3-Domain 3×1 구조를 관측하였고, 이 결과는 J. Quinn등의 결과와 일치함을 알 수 있다. 또한, 기판온도를 증가시킴에 따라 diffuse 1×1, Single domain 3×1구조(450℃)에 대하여 Mg(KLL)/Si(2p) peak intensity ratio를 증착량 증가에 따라 측정하여 각기 다른 온도에서의 Mg 흡착에 대한 mechanism을 제시하였다. Change of the Si(111)7×7 surface structure upon Mg adsorption was studied by RHEED(Reflection HI호 Energy Electron Diffraction) and XPS(X-ray Photoelectron Spectrocopy). The RHEED patterns of Si(111)7×7 were changed to the diffuse 1×1 and 2√3/3×2√3/3-R30° patterns with increasing the deposition times of Mg at RT. The diffuse 1×1, 3-domain, and single domain 3×1 structures appeared successively at the adsorption temperature of 300, 350 and 450℃, respectively. We could find the relative coverages of these structures by measuring Mg(KLL)/Si2p XPS intensity ratio.

Aspergillus awamori와 Zymomonas mobilis로 구성된 고정화혼합 배양계의 에탄올 생산에 미치는 Triton, PVA 및 PEG의 영향

이상원,서권일,박석규,손봉수,김홍출,성찬기 순천대학교 기초과학연구소 1995 基礎科學硏究誌 Vol.6 No.-

The effects of triton-X 100, PVA and PEG on the ethanol production and raw starch hydrolysis by co-immobilized A. awamori and Z. mobilis (A-Z system) were investigated. When gel beads containing A. awamori(1.25 × 10 exp (9) spores/ℓ - gel) and Z. mobilis(0.5g cell/ℓ - gel) were cultured in 2% raw starch solution at 30℃ for 120 hours, ethanol concentration, ethanol yield (Y_p/s) and pH of culture broth were 2.8g/ℓ, 0.16 and 3.8~4.0, respectively. Ethanol production and starch hydrolysis by addition of PVA was efficient, compared to that of PEG and ethanol concentration in culture broth with 0.2% PVA was 3.56g/ℓ. At A-Z 36 culture system with changing silicon check valve for cotton plug at 36 hours in A-Z culture system, ethanol yield on glucose, Y_p/s = 0.36, showed 2 times higher than that of control culture system(cotton plug culture). Ethanol production and productivity by cultivating 85g gel beads at 30℃ in a 1ℓ jar fermentor(220rpm) of medium 500㎖ were 32g/ℓ and 1.8g/ℓ/day, respectively. After 12 hours of cultivation, gel beads were distinguished oxygen-rich surface for A. awamori from oxygen-deficient central part for Z. mobilis.

미세가동 정전용량형 초음파 탐촉자 개발(Ⅱ) : 미세공정기술 분석 Analysis of Microfabrication Process

김기복,안봉영,박해원,김영주,김국진,이승석 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.6

본 연구는 cMUT 제작을 위한 미세공정기술을 개발하기 위하여 수행되었다. 이를 위하여 외국의 관련 제조공정 연구결과들을 분석하였다. cMUT 제작의 주요 공정인 미소 진동 박막 형성, 희생층 형성, 식각 공정에 대한 실험을 수행하여 적절한 공정조건을 찾고자 하였다. 각 제작 공정조건들을 변화시켜 가면서 증착된 실리콘 질화막의 두께, 균일도, 잔류응력을 측정하였다. 희생층으로서 실리콘 산화막의 공정조건을 변화시켜 가면서 산화막의 성장률을 분석하였다. 마지막으로 희생층 식각을 위한 최적 식각공정을 얻기 위한 실험을 수행하였다. 본 연구에서 얻어진 주요 미세공정 조건은 추후 cMUT 제작에 적용될 예정이다. The main goal of this study was to develop a micro-fabrication process for the capacitive micromachined ultrasonic transducer (cMUT). In order to achieve this goal, the former research results of the micro-electro-mechanical system (MEMS) process for the cMUT were analyzed. The membrane deposition, sacrificial layer deposition and etching were found to be a main process of fabricating the cMUT. The optimal conditions for those microfabrication were determined by the experiment. The thickness, uniformity, and residual stress of the Si₃N₃ deposition which forms the membrane of the cMUT were characterized after growing the Si₃N₃ on Si-wafer under various process conditions. As a sacrificial layer, the growth rate of the SiO₂ deposition was analyzed under several process conditions. The optimal etching conditions of the sacrificial layer were analyzed. The microfabrication process developed in this study will be used to fabricate the cMUT.

자가 면역성 간염에서 자가항체의 발현 양상과 스테로이드 치료의 효과

박기오,채경훈,허원석,강윤세,정재훈,김연수,문희석,이엄석,김선문,이병석,김남재,이헌영 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

목적 : 최근 8년간 본원에서 경험한 자기면역성 간염의 혈액학적 특징과 스테로이드의 치료효과를 알아보고자 본 연구를 시행하였다. 방법 : 1996년 이후부터 2002년까지 충남대학교 병원에서 1999년 International Autoimmune Hepatitis Group(LAHG)에서 제시한 수정 진단 기준안에 의거하여 총 진단점수가 probable 이상에 해당하는 환자들을 대상으로 임상적 특징, 검사실 및 조직 소견과 스테로이드와 azathioprine의 치료 효과를 후향적으로 조사하였다. 결과 : 9예의 환자들은 여성이 78%, 40대가 많았고, 급성 발병이 33.3%, 피로감, 식욕부진 및 황달 등이 나타났으며, 항핵항체가 55.6%에서 그리고 항평활근 항체가 77.8%에서 양성이었고, 동반 질환은 류마치스 관절염이 2예, 특발성 혈소판 감소증 1예, Henoch-Sch nlein 자반증 및 그레브스병이 각각 1예 씩이었다. 7예에 대해서 스테로이드와 azathioprine으로 치료하여 생화학적 임상적 완해가 이루어져서 유효한 치료 결과를 얻었다. 결론 : 자가면역성 간염은 우리 나라에서 원인을 찾을 수 없는 만성 간질환의 경우, 특히 중년여성에서 다른 자가면역성 질환이 동반되었을 때 자가면역성 간염을 의심하여 자가항체 선별검사를 시행해 보아야 할 것으로 생각된다. 향후 다기관 연구를 통하여 좀 더 많은 증례를 모으고 전향적인 연구를 시행하여야 할 필요가 있다. Although autoimmune hepatitis(AIH) is common in western contries, some studties have been reported in Korea. The aim of the study was to analyze the clinical and histological features and expression pattern of the autoantibody and to examine clinical course of AIH in Korea. For 9 patients diagnosed as having AIH in our hospital since 1996, we reviewed medical records and analyzed clinical and laboratory findings retrospectively. They had a probable or definite AIH according to the revised criteria of International AIH group. The mean age was 42.7(21∼68)years and 7(77.8%) were female. Three of them(33.3%) showed acute hepatitis and five of them showed cirrhosis. Fatigue and anorexia were the most frequently complained symptoms(55.6%). Four patients(44.4%) were accompanied with other autoimmune diseases. Antinuclear antibody was detected in 5(55.6%) and anti-smooth muscle antibody was detected in 7(77.8%). Three patients showed focal picemeal necrosis and four showed periportal fibrosis. Among 7 patients who received immunosuppressive therapy, six patients(85.7%) showed initial response. and biochemical and serologic remission were achived in 5(71.4%) and 3(42.8%) patients, AIH seems to be partly responsible for chronic liver disease of unknown etiology in Korea. AIH should be suspected in female patients with unknown chronic liver disease of unknown etiolgy, especially accompanied with other autoimmune disease. The clinical characteristics of AIH may not be quite different from those of Western countries.