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.

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.

Giant basal cell carcinoma mimicking extramammary Paget’s disease

( Jun Suk Hong ),( Dong Won Lee ),( Moo Kyu Suh ),( Tae Jung Jang ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1

Basal cell carcinoma (BCC) is the most common type of skin cancer. Ultraviolet light is the most important risk factor in lesion development and progression. Additional risk factors include exposure to arsenic, coal tar derivatives, irradiation, scars, burn sites, chronic inflammation, ulcers, and immune deficiency. BCC arises usually on sun-exposed sites such as the head and neck and occurs uncommonly on non-sunexposed sites such as the axilla, buttock, groin, penis, scrotum, vulva. The Giant BCC is defined as a lesion with more than 5 cm at its largest diameter. Especially Giant BCC on the scrotum, penis, vulva, groin, perianal area where extramammary Paget’s disease occurs commonly mimics extramammary Paget’s disease. We report a case of giant BCC in a 69-year-old man. He presented with localized pricking 6.0x6.0 cm sized erythematous patch with erosion and hyperpigmentation on the perianal area for 4 years. Histopathological findings showed basaloid tumor cells budding within upper dermis and variable infiltrate of lymphocyte, plasma cells around tumor cells. Also, palisading and basaloid cell with variable atypia aggregated in the tumor cells and stroma separates from tumor lobules. He was diagnosed with Giant BCC mimicking extramammary Paget’s disease on the perianal area and had no recurrence after complete excision.

The Development of Phasic and Tonic Inhibition in the Rat Visual Cortex

Jang, Hyun-Jong,Cho, Kwang-Hyun,Park, Sung-Won,Kim, Myung-Jun,Yoon, Shin-Hee,Rhie, Duck-Joo The Korean Society of Pharmacology 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.6

Gamma-aminobutyric acid (GABA)-ergic inhibition is important in the function of the visual cortex. In a previous study, we reported a developmental increase in $GABA_A$ receptor-mediated inhibition in the rat visual cortex from 3 to 5 weeks of age. Because this developmental increase is crucial to the regulation of the induction of long-term synaptic plasticity, in the present study we investigated in detail the postnatal development of phasic and tonic inhibition. The amplitude of phasic inhibition evoked by electrical stimulation increased during development from 3 to 8 weeks of age, and the peak time and decay kinetics of inhibitory postsynaptic potential (IPSP) and current (IPSC) slowed progressively. Since the membrane time constant decreased during this period, passive membrane properties might not be involved in the kinetic changes of IPSP and IPSC. Tonic inhibition, another mode of $GABA_A$ receptor-mediated inhibition, also increased developmentally and reached a plateau at 5 weeks of age. These results indicate that the time course of the postnatal development of GABAergic inhibition matched well that of the functional maturation of the visual cortex. Thus, the present study provides significant insight into the roles of inhibitory development in the functional maturation of the visual cortical circuits.

Tinea corporis caused by Trichophyton verrucosum mimicking nummular dermatitis

( Jun Suk Hong ),( Dong Won Lee ),( Moo Kyu Suh ),( Gyoung Yim Ha ),( Tae Jung Jang ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1

Nummular dermatitis presents as a well-demarcated coinshaped annular plaques form from coalescing papules and papulovesicles. In atypical manifestations of tinea corporis such as vesiculopustular lesion, the accurate diagnosis can be missed. Especially, cutaneous lesions caused by Trichophyton (T.) verrucosum which is known to be most common causative pathogen of dermatophytosis caused by cattle are usually characterized clinically by intense inflammation so they are often misdiagnosed as eczema. A 58-year-old female patient who is cattle keeper presents with localized, pruritic, 3.0 X 3.0 cm sized erythematous annular plaque with central clearing and vesicular border on the left upper arm for 1 month. The result of KOH examination on the left upper arm lesion was negative so we cultured and did biopsy for definitive diagnosis. Histopathology showed short septated hyphae in the stratum corneum. Culture from skin biopsy specimens on Sabouraud’s dextrose agar yielded slow growing, folded, heaped, glabrous, white colonies and lack pigment reverse side after 6 weeks. Microscopically, chains of chlamydoconidia were observed in slide culture. The nucleotide sequence of internal transcribed spacer for clinical isolate was identical to that of T. verrucosum strain CBS 562.50. The patient was treated with 100 mg of oral itraconazole daily for 1 month and the skin lesion was improved completely.

Combined effects of p73 and MDM2 polymorphisms on the risk of lung cancer

Jun, Hee Jung,Park, Sun Ha,Lee, Won Kee,Choi, Jin Eun,Jang, Jin Sung,Kim, Eun Jin,Cha, Sung Ick,Kim, Dong Sun,Kam, Sin,Kim, Chang Ho,Kang, Young Mo,Jung, Tae Hoon,Park, Jae Yong Alan R. Liss, Inc 2007 Molecular carcinogenesis Vol.46 No.2

<P>p73, a structural and functional homologue of p53, plays an important role in modulating cell-cycle control and apoptosis. MDM2 represses the transcriptional activity of p73 and thus attenuates its activity. Based on the interaction between p73 and MDM2 in cell-cycle control and apoptosis, we investigated the association between p73 G4C14-to-A4T14 and MDM2 309T > G polymorphisms, alone and in combination, on the risk of lung cancer in a Korean population. The p73 and MDM2 genotypes were determined in 582 lung cancer patients and in 582 healthy control subjects who were frequency-matched for age and gender. The p73 AT/AT and MDM2 309 GG genotypes were associated with a nonsignificant increased risk of lung cancer (adjusted odds ratio [OR] = 1.37, 95% confidence interval [CI] = 0.83–2.24; and adjusted OR = 1.29, 95% CI = 0.92–1.80, respectively), compared with their wild-type genotypes, respectively. When the p73 and MDM2 polymorphisms were combined, the risk of lung cancer increased in a dose-dependent manner as the number of variant alleles increased (P<SUB>trend</SUB> = 0.01). Subjects with three or four variant alleles were at a significantly increased risk of lung cancer (adjusted OR = 1.74, 95% CI = 1.11–2.74, P = 0.02) compared to subjects with zero variant allele. These results suggest an additive effect of the p73 and MDM2 variant alleles on an increased risk of lung cancer. © 2006 Wiley-Liss, Inc.</P>

Dramatic enhancement of the saturation magnetization of a sol-gel synthesized Y₃Fe₅O₁₂ by a mechanical pressing process

Jang, Min-Sun,Roh, Im-Jun,Park, Jungmin,Kang, Chong-Yun,Choi, Won Jun,Baek, Seung-Hyub,Park, Sung Soo,Yoo, Jung-Woo,Lee, Ki-Suk Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.711 No.-

<P><B>Abstract</B></P> <P>We fabricated polycrystalline yttrium-iron-garnet (Y<SUB>3</SUB>Fe<SUB>5</SUB>O<SUB>12</SUB>, YIG) samples using the sol-gel synthesis method to develop an energy harvesting material based on the spin Seebeck effect. We confirmed that crystallization occurred during calcination at 850 °C and that only the polycrystalline YIG structure was formed. We found that a sintering process at 1400 °C not only increased the size of the YIG particles and the densification of their microstructure but also enhanced their saturation magnetization (M<SUB>s</SUB>) and dramatically reduced their coercivity (H<SUB>c</SUB>). A mechanical pressing process was carried out between the calcination and sintering treatments to prepare a free-standing YIG fillet sample. We found that M<SUB>s</SUB> was enhanced by almost three times without an associated reduction in H<SUB>c</SUB>. We found that mechanical pressing assists the oxidation reaction during the subsequent sintering process by increasing the surface energy and densification before the heat treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Yttrium-iron-garnet (YIG) was prepared using sol-gel process without an expensive GGG substrate. </LI> <LI> Optimal calcination and sintering temperatures were determined. </LI> <LI> Substrate-free YIG was fabricated by mechanical pressing. </LI> <LI> Sintering and pressing treatments improved significantly the saturation magnetization (M<SUB>s</SUB>) of YIG. </LI> <LI> The role of mechanical pressing in the enhancement of M<SUB>s</SUB> is addressed clearly. </LI> </UL> </P>

H<SUB>2</SUB> and CO production from CO<SUB>2</SUB> reforming of methane over Ni-MgO-Ce<SUB>0.8</SUB>Zr<SUB>0.2</SUB>O<SUB>2</SUB> catalyst

Won-Jun Jang,Dae-Woon Jeong,Jae-Oh Shim,Hak-Min Kim,Kyung-Won Jeon,Won-Bi Han,Hyun-Suk Na,Hyun-Seog Roh 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05

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>

Local Electronic Structures of Graphene Probed by Scanning Tunneling Spectroscopy

Won-Jun Jang,Eui-SupLee,HowonKim,JongKeonYoon,YunheeChang,Yong-Hyun Kim,Se-JongKahng 한국진공학회 2013 한국진공학회 학술발표회초록집 Vol.2013 No.8