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.

고랭지 농업 용수확보를 위한 소규모 빗물 이용시설 적용방안

전계원(Kye Won Jun)(全桂元),장창덕(Chang Deok Jang)(張昌德),정승권(Seung Kwon Jung)(鄭承權),전병희(Byong Hee Jun)(田炳熙) 위기관리 이론과 실천 2013 Crisisonomy Vol.9 No.8

최근 기후변화로 지난 2009년과 2012년에 강원도 태백시에서는 가뭄으로 인하여 엄청난 피해를 경험한 적이 있다. 또한 가뭄과 장마의 예측은 점점 더 어려워져 가는 실정이다. 특히 태백시의 87일간의 가뭄과 제한급수에 따른 피해액은 일상생활 134억원, 산업부문 338억원, 공공부문 47억원, 정신적ㆍ사회적 피해 1, 430억원 등 총 1, 949억원에 달하는 것으로 분석되었다. 태백시에 또 다른 큰 문제점은 가뭄으로 인한 고랭지 농업 피해로 인한 손실이다. 고랭지 배추를 생산하는 태백시는 우리나라 유일의 고산지역의 도시로서, 고랭지 농업이 특히 발달한 지역이다. 특히 태백 고랭지 배추는 태백시 농산품의 95.9%, 총 경지면적의 86.6%를 차지하고 있으므로, 배추의 생산성이 태백시 농산품 생산성을 대변한다고 할 수 있다. 본 연구에서는 태백시의 공공기관과 고랭지 농업 지역을 직접 방문하여 소규모 빗물 이용 시설에 대한 현황조사 및 시설의 상태를 점검하고 가뭄발생시 고랭지 농업지역의 피해를 최소화 할 수 있도록 소규모 빗물 이용 시설의 적용 방안 및 효과를 분석하였다. Recently, drought and rainy season are getting more serious. It is getting hard to forecast about drought because drought frequency is getting shorter than before. In 2009(winter) and 2012(summer), Taebaek-si was suffered from enormous damage due to the drought. Particularly, in 2009, cost of damage due to drought and restriction on water supply for 87days were estimated daily life sector 134 billion won, industry sector 338 billion won, the public sector 47 billion won, mental and social damage 1, 430 billion won. The other big issue of Taebaek is decrease in products of Highland Agricultural caused by the drought. Highland chinese cabbage which is the most important agricultural product in Taebaek-si account for 95.9% of all agricultural production of Taebaek-si and account for 86.6% of all gross area. For this reason, chinese cabbage of Taebaek-si is tropical agricultural product and is in charge of supply cabbage definitely. It is considered that if small scale rainwater harvesting system would be installed in highland agriculture area, it could reduce damage of drought at low cost and damage of cabbage would be decrease by system. For this study, We have researched regarding current status of Small Scale Rainwater Harvesting System of Highland Agriculture area in Taebaek-si and have compared with the amount of damage and installation cost in case of drought for the beneficial effects of Small Scale Rainwater Harvesting System, flexible supply of water and damage minimization of agricultural products.

Application of Cerenkov radiation generated in plastic optical fibers for therapeutic photon beam dosimetry.

Jang, Kyoung Won,Yagi, Takahiro,Pyeon, Cheol Ho,Yoo, Wook Jae,Shin, Sang Hun,Jeong, Chiyoung,Min, Byung Jun,Shin, Dongho,Misawa, Tsuyoshi,Lee, Bongsoo SPIE--the International Society for Optical Engine 2013 Journal of biomedical optics Vol.18 No.2

<P>A Cerenkov fiber-optic dosimeter (CFOD) is fabricated using plastic optical fibers to measure Cerenkov radiation induced by a therapeutic photon beam. We measured the Cerenkov radiation generated in optical fibers in various irradiation conditions to evaluate the usability of Cerenkov radiation for a photon beam therapy dosimetry. As a results, the spectral peak of Cerenkov radiation was measured at a wavelength of 515 nm, and the intensity of Cerenkov radiation increased linearly with increasing irradiated length of the optical fiber. Also, the intensity peak of Cerenkov radiation was measured in the irradiation angle range of 30 to 40 deg. In the results of Monte Carlo N-particle transport code simulations, the relationship between fluxes of electrons over Cerenkov threshold energy and energy deposition of a 6 MV photon beam had a nearly linear trend. Finally, percentage depth doses for the 6 MV photon beam could be obtained using the CFOD and the results were compared with those of an ionization chamber. Here, the mean dose difference was about 0.6%. It is anticipated that the novel and simple CFOD can be effectively used for measuring depth doses in radiotherapy dosimetry.</P>

Potential nonmonotonous association between di(2-ethylhexyl) phthalate (DEHP) exposure and atopic dermatitis in Korean children

Won-Jun Choi(최원준),Ho-Jang Kwon,Soyoung Hong,Wan Ryung Lim,Hyunjung Kim,Jeonghoon Kim,Chaebong Kim,KyooSang Kim 대한직업환경의학회 2013 대한직업환경의학회 학술대회 논문집 Vol.2013 No.11

High-dose stereotactic body radiotherapy correlates increased local control and overall survival in patients with inoperable hepatocellular carcinoma

Jang, Won Il,Kim, Mi-Sook,Bae, Sun Hyun,Cho, Chul Koo,Yoo, Hyung Jun,Seo, Young Seok,Kang, Jin-Kyu,Kim, So Young,Lee, Dong Han,Han, Chul Ju,Kim, Jin,Park, Su Cheol,Kim, Sang Bum,Cho, Eung-Ho,Kim, Youn BioMed Central 2013 Radiation oncology Vol.8 No.-

<P><B>Background</B></P><P>Recent studies using stereotactic body radiotherapy (SBRT) for hepatocellular carcinoma (HCC) have reported high tumor response and local control. However, the optimal SBRT dose remains unknown, and it is still not clear whether a dose response relationship for local control (LC) and overall survival (OS) exist or not. We performed this study to determine whether a dose response relationship for LC and OS is observed in SBRT for inoperable HCC.</P><P><B>Methods</B></P><P>Between 2003 and 2011, 108 patients with HCC were treated with SBRT. All patients were unsuitable for surgery or local ablation and had incomplete response to transarterial chemoembolization. Eighty-two patients with a longest tumor diameter (LD) less than or equal to 7.0 cm who were treated with 3-fraction SBRT and were analyzed. This cohort comprised 74 Child-Turcotte-Pugh (CTP) class A patients and 8 CTP class B7 patients. The median LD was 3.0 cm (range, 1.0–7.0 cm), and the median dose was 51 Gy (range, 33–60 Gy).</P><P><B>Results</B></P><P>LC and OS rates at 2 years after SBRT were 87% and 63%, respectively, with a median follow-up duration of 30 months for all patients. The 2-year LC/OS rates for patients treated with doses of > 54, 45–54, and < 45 Gy were 100/71, 78/64, and 64%/30%, respectively (p = .009/p < .001). Multivariate analysis revealed that the SBRT dose (p = .005) and Barcelona Clinic Liver Cancer stage (p = .015) were significant prognostic factors for OS. Correlation analysis revealed a positive linear relationship between the SBRT dose and LC (p = .006, R = .899)/OS (p = .002, R = .940) at 2 years. Based on the tumor-control probability model, a dose of 54.8 Gy provides 2-year LC with a 90% probability. Five patients experienced grade 3 or higher gastrointestinal toxicity, and 6 had deteriorating of CTP score by greater than or equal to 2 within 3 months of SBRT.</P><P><B>Conclusions</B></P><P>This study demonstrated a dose response relationship for LC and OS with SBRT for HCC. Higher LC rates resulting from an increased dose may translate into survival benefits for patients with HCC.</P>

Well-to-Wheel Analysis (WTW) on Greenhouse Gas Emissions of Transportation Fuels in South Korea

Won Jae Choi,Eunji Yoo,Jae Jun Jang,Eunsu Seol,Myoungsoo Kim,Han Ho Song(송한호) 한국자동차공학회 2018 한국자동차공학회 Workshop Vol.2018 No.8

Gene expression and DNA methylation status of chicken primordial germ cells.

Jang, Hyun-Jun,Seo, Hee Won,Lee, Bo Ram,Yoo, Min,Womack, James E,Han, Jae Yong Humana Press 2013 Molecular biotechnology Vol.54 No.2

<P>DNA methylation reprogramming of primordial germ cells (PGCs) in mammals establishes monoallelic expression of imprinting genes, maintains retrotransposons in an inactive state, inactivates one of the two X chromosomes, and suppresses gene expression. However, the roles of DNA methylation in chickens PGCs are unknown. In this study, we found a 1.5-fold or greater difference in the expression of 261 transcripts when comparing PGCs and chicken embryonic fibroblasts (CEFs) using an Affymetrix GeneChip Chicken Genome Array. In addition, we analyzed the methylation patterns of the regions ~5-kb upstream of 261 sorted genes, 51 of which were imprinting homologous loci and 49 of which were X-linked homologous loci in chicken using the MeDIP Array by Roche NimbleGen. Seven hypomethylated and five hypermethylated regions within the 5-kb upstream regions of 261 genes were found in PGCs when compared with CEFs. These differentially methylated regions were restrictively matched to differentially expressed genes in PGCs. We also detected 203 differentially methylated regions within imprinting and X-linked homologous regions between male PGCs and female PGCs. These differentially methylated regions may be directly or indirectly associated with gene expression during early embryonic development, and the epigenetic difference could be evolutionally conserved between mammals and birds.</P>

Alkali resistant Ni-loaded yolk-shell catalysts for direct internal reforming in molten carbonate fuel cells

Jang, Won-Jun,Hong, Young Jun,Kim, Hak-Min,Shim, Jae-Oh,Roh, Hyun-Seog,Kang, Yun Chan Elsevier 2017 Journal of Power Sources Vol.352 No.-

<P><B>Abstract</B></P> <P>A facile and scalable spray pyrolysis process is applied to synthesize multi-shelled Ni-loaded yolk-shell catalysts on various supports (Al<SUB>2</SUB>O<SUB>3</SUB>, CeO<SUB>2</SUB>, ZrO<SUB>2</SUB>, and La(OH)<SUB>3</SUB>). The prepared catalysts are applied to direct internal reforming (DIR) in a molten carbonate fuel cell (MCFC). Even on exposure to alkali hydroxide vapors, the Ni-loaded yolk-shell catalysts remain highly active for DIR-MCFCs. The Ni@Al<SUB>2</SUB>O<SUB>3</SUB> microspheres show the highest conversion (92%) of CH<SUB>4</SUB> and the best stability among the prepared Ni-loaded yolk-shell catalysts. Although the initial CH<SUB>4</SUB> conversion of the Ni@ZrO<SUB>2</SUB> microspheres is higher than that of the Ni@CeO<SUB>2</SUB> microspheres, the Ni@CeO<SUB>2</SUB> microspheres are more stable. The catalytic performance is strongly dependent on the surface area and acidity and also partly dependent on the reducibility. The acidic nature of Al<SUB>2</SUB>O<SUB>3</SUB> combined with its high surface area and yolk-shell structure enhances the adsorption of CH<SUB>4</SUB> and resistance against alkali poisoning, resulting in efficient DIR-MCFC reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni yolk-shell catalysts are synthesized by a simple spray pyrolysis process. </LI> <LI> Ni yolk-shell catalysts on various supports are applied to DIR-MCFC. </LI> <LI> Ni@Al<SUB>2</SUB>O<SUB>3</SUB> shows the highest CH<SUB>4</SUB> conversion even on exposure to alkali hydroxide. </LI> <LI> Catalytic performance is strongly dependent on acidity and partly on reducibility. </LI> <LI> Acidic nature with yolk-shell structure enhances resistance to alkali poisoning. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Considerations for patient selection: Prepectoral versus subpectoral implant-based breast reconstruction

Jun Young Yang,Chan Woo Kim,Jang Won Lee,김승기,이승아,Euna Hwang 대한성형외과학회 2019 Archives of Plastic Surgery Vol.46 No.6

Background In recent years, breast implants have been frequently placed in the subcutaneouspocket, in the so-called prepectoral approach. We report our technique of prepectoralimplant-based breast reconstruction (IBR), as well as its surgical and aesthetic outcomes, incomparison with subpectoral IBR. We also discuss relevant considerations and pitfalls in prepectoralIBR and suggest an algorithm for the selection of patients for IBR based on our experiences. Methods We performed 79 immediate breast reconstructions with a breast implant and anacellular dermal matrix (ADM) sling, of which 47 were subpectoral IBRs and 32 were prepectoralIBRs. Two-stage IBR was performed in 36 cases (20 subpectoral, 16 prepectoral), and direct-to-implant IBR in 43 cases (27 prepectoral, 16 subpectoral). The ADM sling supplementedthe inferolateral side of the breast prosthesis in the subpectoral group and covered the entireanterior surface of the breast prosthesis in the prepectoral group. Results The postoperative pain score was much lower in the prepectoral group than in thesubpectoral group (1.78 vs. 7.17). The incidence of seroma was higher in the prepectoralgroup (31.3% vs. 6.4%). Other postoperative complications, such as surgical site infection,flap necrosis, implant failure, and wound dehiscence, occurred at similar rates in both groups. Animation deformities developed in 8.5% of patients in the subpectoral group and ripplingdeformities were more common in the prepectoral group (21.9% vs. 12.8%). Conclusions The indications for prepectoral IBR include moderately-sized breasts with athick well-vascularized mastectomy flap and concomitant bilateral breast reconstructionwith prophylactic mastectomy.

Design and scale-up of a Cr-free Fe-Al-Cu catalyst for hydrogen production from waste-derived synthesis gas

Jang, Won-Jun,Shim, Jae-Oh,Jeon, Kyung-Won,Na, Hyun-Suk,Kim, Hak-Min,Lee, Yeol-Lim,Roh, Hyun-Seog,Jeong, Dae-Woon Elsevier 2019 Applied Catalysis B Vol.249 No.-

<P><B>Abstract</B></P> <P>Herein, we have prepared a series of Cr-free Fe-Al-Cu catalysts by the homogeneous one-step co-precipitation method and examined their ability to promote the water gas shift (WGS) reaction and thus facilitate the production of hydrogen from waste-derived synthesis gas. The prepared catalysts are confirmed to possess γ-Fe<SUB>2</SUB>O<SUB>3</SUB>, which can be more easily transformed into Fe<SUB>3</SUB>O<SUB>4</SUB> than α-Fe<SUB>2</SUB>O<SUB>3</SUB>. The surface area, Fe<SUB>3</SUB>O<SUB>4</SUB> crystallite size, reducibility, and Cu dispersion of these catalysts significantly depend on the concentrations of metal precursor. The catalysts effectively promote the WGS reaction without facilitating undesirable side reactions, achieving efficient hydrogen production and high CO conversion. The characteristics of the best-performing sample are preserved when the production is scaled up by a factor of 40 and thus obtained large-scale Fe-Al-Cu catalyst exhibits excellent reducibility and high CO conversion. Both commercial Fe-Cr and large-scale Fe-Al-Cu catalysts achieve close-to-equilibrium CO conversions at a gas hourly space velocity (GHSV) of 3000 mL g<SUP>−1</SUP> h<SUP>−1</SUP>, but the latter showed a higher conversion than the former at a GHSV of 40,057 mL g<SUP>−1</SUP> h<SUP>−1</SUP> owing to the promotional effect of Cu on the easier reducibility of Fe species and the formation of additional Cu active sites. Thus, we demonstrate the possibility of finding Cr-free alternatives and show that the reducibility, Fe<SUB>3</SUB>O<SUB>4</SUB> crystallite size, and Cu dispersion of the best-performing catalyst could be maintained upon upscaling, which made this catalyst well suited for converting waste-derived synthesis gas into H<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe-Al-Cu catalysts were prepared by homogenous one-step co-precipitation. </LI> <LI> Precursor concentrations were systematically varied at optimized composition. </LI> <LI> Obtained catalysts promoted the recovery of H<SUB>2</SUB> from waste-derived synthesis gas. </LI> <LI> Efficient H<SUB>2</SUB> recovery and high CO conversion were achieved. </LI> <LI> Properties of the best catalyst were preserved when production was upscaled. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>