대호 간척기 토양의 염농도별 밭작물의 염해 평가

이승헌,류순호,설수일,안열,정영상,이상모 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-

This study was carried out to obtain the basic data for selecting the applicable crops in reclaimed land during desalinization period. A pot experiment was conducted with 5 different electrical conductivities of the saturated extracts (ECe 1, 3, 9, 14, and 16 dS·m^(-1)) of soils taken from the Dae-Ho reclaimed tidal lands. Eight crops (Chinese cabbage, radish, tomato, red pepper, buckwheat, soybean, sesame, and green perilla) were grown for 37days. Plant height and number of leaves were surveyed on 2 and 4 weeks after seeding, and on harvest time (5 weeks). After harvest, dry weights of harvested crops were measured and soil chemical properties were analyzed. Emergence rates of crops were comparatively high except sesame. For sesame, there was no emergence at ECe over 3 dS·m^(-1). Growth and dry weight decreased significantly as increasing ECe. The ECe which decreased 50% of dry weight index were 14.2 dS·m^(-1) for radish, 11.4 dS·m^(-1) for Chinese cabbage, 10.2 dS·m^(-1) for tomato for red pepper, 8.9 dS·m^(-1) for buckwheat and green perilla, 8.6 dS·m^(-1) for soybean, and 8.9 dS·m^(-1) for tomato. At higher ECe that start the growth inhibition, increasing 1 dS·m^(-1) in ECe, 7.7, 6.5, 5.9, 5.6, 5.2, and 4.9% of dry weight decreased for buckwheat, green perilla, Chinese cabbage, radish, soybean, and tomato (red pepper), respectively. The critical value of ECe for crop survival except sesame was 15.4~23.1 dS·m^(-1).

Physical Chemistry Research Articles Published in the Bulletin of the Korean Chemical Society: 2003-2007

Sun, Ho-Sung,Lee, Sun-Yeoul,Lee, Choon-Shil Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.2

The physical chemistry (PC) articles published in the Bulletin of the Korean Chemical Society (BKCS) from 2003 to 2007 are surveyed, and in-depth content analysis was conducted to classify the PC articles into 12 topics used in The Journal of Physical Chemistry (JPC). The PC articles published in the Journal of the American Chemical Society (JACS) in 2007 are also surveyed. The extensive summary of all PC articles in BKCS for the last five years reveals the current trend of physical chemistry research in Korea. The comparison study with the JACS shows that the proportion of PC articles among all articles published in BKCS (16%) is slightly higher than that of JACS (11%), and the non-Korean authorship ratio of BKCS (12%) is very low compared with the non-US authorship of JACS (52%). From the comparison study with articles published in JPC in 2007, it is found that BKCS disseminates various topics of physical chemistry researches adequately. In particular, BKCS most frequently published PC articles in molecular structure and spectroscopy topics, whereas JPC published surface chemistry and nano-chemistry articles most frequently. It is concluded that BKCS should publish more articles to be a leading journal, and it is suggested that the SCI impact factor of BKCS must be increased by improving the electronic version of BKCS.

The p38 MAP Kinase Mediates Iron chelator-Induced Apoptosis and Differentiation of Immortalized and Malignant Human Oral Keratinocytes

Sun Kyung Lee,Hyun Ju Jang,Dae Yeoul Park,Young Soo Hwang,Hwa Jeong Lee,Eun Cheol Kim 대한구강악안면병리학회 2005 대한구강악안면병리학회지 Vol.29 No.5

1'0 determine Lhe ll1echanism of cell c1eath incluced by iron chelators. we explored the pathways of the three structurally relatecl ll1 itogen-activatecl protein(MAP) kinase subfami li esduring iron cbelator- inclucecl apoptosis ancl differentiation of oral precancerous ancl cancel‘ cells. The iron chelator c1 eferoxamine(DFO) exertecl potent timeancl c1ose-c1epenclent inhi bitory effects on the growth of IHOK and HN4 cells The major mechanism of growth inhibition following DFO treatment was fOllncl to be apoptosis incluction. as assessecl by annexin V-FITC staining. cell cycle analysis‘ DNA lacldering, a ncl Hoechst staining. We report that DF'O s trongly activates the p38 MAP kinase and extracell ular signal- regu lated kinase(ERK). but c10es not activate the c-Jun N-terminal kin ase/ stl않s-activaLecl protein kinase(JNK/8APK) . Of the three MAP kinase blockers usecl‘ the selective p38 MAP kinase inhibitor 8ß203580 ancl ERK inhibitor PD98059 protected oral premaIignant ancl malignant cells againsL iron chelator- nclllced cell death. which incl icates that the p38 MAP kinase serves as a major mecliator 01' apoptos is induced by this iron chelator DFO also evoked the release of cytochrome c from mitochondria, and incluced the activation of caspase-3 ancl caspase-8 in oral cancer cells, which suggests that apoptosis occurs via the mi tochoncl ri on - mecl iaLed pathway. DFO enhanced the expression of Bax in IHOK ancl HN4 cells. consistent witll thei r p53 status Moreover. DFO downregulatecl the expression 01' Bcl-2 in oral cancer cells. which suggests that DFO- incluced apoptos is 01' oraJ cancer and precancerous cells may be mediatecl by an increase in the ratio of pro-apoptotic to anti-apoptotic proteins. ln terestingJy, trcatmcnt 01' IHOK ancl HN4 cel ls with 8B203580 abolishecl cytochrome c release‘ as wel l as the activation of caspase-3 and caspase-8. DFO suppressecl the expression of epithelial di ffe rentiation markers, such as involucrin, t ransglutaminase II. CK6. and CK19. ancl this suppression was blockecl by p38 ancl ERK MAP kinase ll1hlbltors The oral premalignant(IHOK) ancl malignant cell s(I-lN4) showed differential responses to DFO with respect to the expression of cel l cycle regulatory proteins. cell growth. ancl apoptosis. Coll ectively. the current study reveals that p38 MAP kinase plays an ill1 portant role in iron chela tor-mecliatecl cel l cleath and in the suppression of differentiation of oral premalignantandmalignanLcell s.by activating a c10wnstream apoptotic cascade that executes the ceIl c1eath pathway

Trusted Third Party for Clearing Consumption Tax of Global Electronic Commerce and System Architecture of Global Electronic Tax Invoice (GETI)

Yeoul Hwangbo,Sun-bok Seo 서울행정학회 2004 서울행정학회 학술대회 발표논문집 Vol.- No.-

This study deals with controversial issues surrounding the today’s cyber-taxation and recommends a feasible consumption tax system architecture titled Global Electronic Tax Invoice System (GETI). The GETI is an electronic consumption tax architecture to provide “all-in-one” tax and e-payment services through a trusted third party (TTP). GETI is designed to streamline the overall cyber-taxation process and provide simplified and transparent tax invoice services through an authorized TTP. To ensure information security, GETI incorporates Public Key Infrastructure (PKI) based digital certificates and other data encryption schemes when calculating, reporting, paying, and auditing tax in the electronic commerce environment. GETI is based on the OECD cyber-taxation agreement that was reached in January 2001, which established the taxation model for B2B and B2C electronic commerce transactions. For the value added tax systems, tax invoice is indispensable to commerce activities, since they provide documentations to prove the validity of commercial transactions. As paper-based tax invoice systems are gradually phased out and are replaced with electronic tax invoice systems, there is an increasing need to develop a reliable, efficient, transparent, and secured cyber-taxation architecture. To design such architecture, several desirable system attributes were considered -reliability, efficiency, transparency, and security. GETI was developed with these system attributes in mind.

Energy Decay for a Von Karman Equation of Memory Type with a Delay Term

Park, Sun-Hye,Park, Jong-Yeoul,Kang, Yong-Han 'Scientific Research Publishing, Inc.' 2017 Journal of applied mathematics and physics Vol.5 No.9

Spontaneous Electrical Activity of Cultured Interstitial Cells of Cajal from Mouse Urinary Bladder

Kim, Sun-Ouck,Jeong, Han-Seong,Jang, Sujeong,Wu, Mei-Jin,Park, Jong Kyu,Jiao, Han-Yi,Jun, Jae Yeoul,Park, Jong-Seong The Korean Society of Pharmacology 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.6

Interstitial cells of Cajal (ICCs) from the urinary bladder regulate detrusor smooth muscle activities. We cultured ICCs from the urinary bladder of mice and performed patch clamp and intracellular $Ca^{2+}$ ($[Ca^{2+}]_i$) imaging to investigate whether cultured ICCs can be a valuable tool for cellular functional studies. The cultured ICCs displayed two types of spontaneous electrical activities which are similar to those recorded in intact bladder tissues. Spontaneous electrical activities of cultured ICCs were nifedipine-sensitive. Carbachol and ATP, both excitatory neurotransmitters in the urinary bladder, depolarized the membrane and increased the frequency of spike potentials. Carbachol increased $[Ca^{2+}]_i$ oscillations and basal $Ca^{2+}$ levels, which were blocked by atropine. These results suggest that cultured ICCs from the urinary bladder retain rhythmic phenotypes similar to the spontaneous electrical activities recorded from the intact urinary bladder. Therefore, we suggest that cultured ICCs from the urinary bladder may be useful for cellular and molecular studies of ICCs.

Development of Commercially Viable Method of Conjugated Linoleic Acid Synthesis Using Linoleic Acid Fraction Obtained from Pork By-products

Sung Yeoul Yoon,Da Young Lee,On You Kim,Seung Yun Lee,Sun Jin Hur 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.4

The purpose of this study was to develop a commercially viable method for synthesis of conjugated linoleic acid (CLA) using the linoleic acid fraction obtained from six pork by-products (liver, lung, heart, stomach, small intestine, and large intestine). The workflow of CLA synthesis from each by-product was as follows: washing→crude fat extraction→fractionation into saturated and unsaturated fatty acids→repeat unsaturated fatty acid fractionation→CLA synthesis. Cis-9, trans-11, and trans-10, cis-12 CLA was synthesized from pork by-products. The yield of CLA synthesis of pork by-products ranged from 1.55 to 11.18 g per 100 g of by-products. The amount of synthesized CLA was the highest in the small intestine and large intestine by-products. Fractionation of pork by-products nearly doubled the yield of CLA. We suggest that commercial fractionation methods could increase the yield of CLA at low cost, reduce waste, and improve the efficiency of by-product utilization.

An AE System Using Fuzzy PI Control for Mobile Digital Camera

Ki-Yeoul Kim,Sun-Ho Cho 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.7

An AE (Auto Exposure) system for a digital camera controls the exposure automatically to optimize the brightness of the output image. Look-up tables and PI control methods are used for conventional AE algorithms. But a mobile digital camera cant control the exposure effectively with a conventional AE algorithm because of the many limitations of a miniaturized module. In this paper, we propose a new AE system that applies fuzzy PI to improve the AE of a mobile digital camera. In the proposed AE system, we compensate for target setting, frame delay, and Gamma Correction to accomplish more effective AE. The proposed AE system was compared with a conventional system and showed improved AE control speed, control stability, and luminance expression.

Smart Card System Architecture for enhancing the security and the applications of Local e-Government

Hwangbo Yeoul,Suh Sun Bok 서울행정학회 2003 서울행정학회 학술대회 발표논문집 Vol.- No.-

This study deals with smart card system issues surrounding the e-government and recommends feasible system architecture for smart card-based e-government As concerns for e-government have been growing in recent years, most of countries have implemented or have the planning to develop the e-government programs. e-Government can provide good opportunities to ensure the efficiency of public services, the transparency of public affairs, and the participation of citizens called as e-democracy. However, it simultaneously poses the risks of security and the lack of public services. Smart card can be considered as an infrastructure component for public service enabler as well as for network security based on Public Key Infrastructure (PIG). Although there have been many studies and trials on smart card system implementation for a long time, smart card-based infrastructure has not been established yet - for its dissemination has been prevented by the obstacles, such as an immature technology, a political resistance, and the lack of application. The system of smart card needs to be focused on the application as well as the technology for the purpose of satisfying a citizen. In this study, we suggest new smart card-based system models; harmonization of the front-office and the back-office, the simple issuance model, and the ubiquitous convergence model. This research result clearly shows that the smart card can be the best solution for satisfying the citizen by supporting the application of e-government as well as the security on cyberspace.

대호 간척지의 제염진해에 따른 초기 식생 변화

류순호,이상모,이승헌,안열 한국환경농학회 2000 한국환경농학회지 Vol.19 No.4

간척지의 식생 천이조사와 토양의 이화학성 분석을 통해 간척지 현장에서 식생과 토양의 제염정도와의 관계를 파악할 수 있는 기초자료를 제공하고자 실험을 수행하였다. 충청남도 대호 간척지내의 식생보전 포장에서 식생별로 A 에서 G 까지 7개그룹으로 구분하여 토양 시료를 채취하여 토양의 이화학성을 분석하였다. A 그룹는 명 나문재, 퉁퉁마디, B 그룹은 갯개미취, 개망초, C 그룹은 강아지풀, D 그룹은 갈대, E 그룹은 갯질경, F 그룹은 토끼풀, G 그룹은 갯잔디, 톨페스큐가 각각 우점종 이었다. 식생 보존구내의 식생 천이과정은 초기에는 A 그룹이 우점하다가 이후 B 그룹이 등장하였고 기타 그룹의 식생은 거의 동시기에 출현하여 경쟁하는 양상을 보였다. 보존구내의 토양은 전채적으로 토성은 미사질양토였고 토양 비옥도는 일반 농경지와 비교하여 매우 낮았다. 토양의 pH는 7.0 ∼ 8.0 범위였고, 전기전도도는 A 그룹을 제외한 나머지 그룹은 모두 표토는 평균 10 dS m^(-1) 이하, 심토는 평균 20 dS m^(-1) 이하였다. SAR 값은 A 그룹이 자라는 토양은 염류-나트륨성 토양의 특징을 나타내었고 기타의 그룹은 염류토양의 특징을 나타내었다. 제염의 진행에 따른 수용성 양이온과 음이온 조성변화는 1가이온 이 감소함에 따라 2가이온의 비중이 점점 높게 되는 경향을 보였다. 간척지에서 식생 천이과정과 토양의 제염정도의 관계는 명아 주과외의 식생의 출현은 전기전도도는 평균 10 dS m^(-1) 이하, SAR은 15 이하에서 이루어지는 것으로 나타났다. In order to obtain the reference data to be used as an vegetation index for degree of desalinization, vegetation successions were surveyed and soil chemical characteristics were analyzed at the naturally maintained plot in Dae-Ho reclaimed land. Seven Groups (A ∼ G group) were classified as major vegetation; A group (Suaeda asparagoides MAKINO etc.), B group (Aster tripolium L. etc.), C group (Stearia viridis L. BEAUV), D group ( Phragmites longivalvis STEUD), E group (Limonium tettagonum THUMB A. A. BULLOCK), F group (Trifolium repens L.), G group (Zoysia sinca HANCE etc.). As desalinization process proceeded, the wild vegetation changed in order of A → B group, D → C group, E → F, G group. Soil texture of the naturally maintained plot was silt loam and soil fertility was very low compared with agricultural cultivated soil. Soil pH ranged from 7.0 to 8.0. Electrical conductivity (ECe) was below 10 and 20 dS·m^(-1) at top and subsoil, respectively, except the plot where A group were growing. Resulting from SAR and ECe, The plot where A group was growing was saline-sodic soil and the others were saline soil. The relation between vegetation sucession and soil desalinization showed that vegation appeared under 10 dS·m^(-1) of ECe and 15 of SAR except A group.