• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2019년도 학술발표회
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• pp.163-163
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• 2019

The rapidly growing global population increases the awareness of water, energy, and food security worldwide. The concept of Water, Energy, and Food nexus (hereafter, WEF nexus) has been widely introduced as a new resources management concept that integrate the water, energy, and food in a single management framework. Recently, WEF nexus analyzes not only the interconnections among the resources, but also considers the external factors (such as environment, climate change, policy, finance, etc) to enhance the resources sustainability by proper understanding of their relations. A nation-level resources management is quite complex task since multiple regions (e.g., watersheds, cities, and counties) with different characteristics are spatially interconnected and transfer the resources each other. This study proposes a multiple region WEF nexus simulation and transfer model. The model is equipped with three simulation modules, such as local nexus simulation module, regional resources transfer module, and optimal investment planning module. The model intends to determine an optimal capital investment plan (CIP), such as build-up of power plants, water/waste water treatment plants, farmland development and to determine W-E-F import/export decisions among areas. The objective is to maximize overall resources sustainability while minimize financial cost. For demonstration, the proposed model is applied to a semi-hypothetical study area with three different characterized cities. It is expected the model can be used as a decision support tool for a long-term resources management planning process.

• 무역학회지
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• 제44권4호
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• pp.1-17
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• 2019

The purpose of this paper is to suggest strategies for Korean companies to overcome the limitation of the international trade structure between Korea and Vietnam. This study examined foreign multinational distribution companies, Korean distribution companies and domestic distribution companies in Vietnam. A SWOT analysis conducted to propose effective strategies revealed that Saigon Mart, Vietnam's largest regional mart company, needs an O/W strategy and to capture market opportunities quickly through strategic alliances with foreign distribution companies, in order to gradually complement their core competencies internally. Lotte mart in Vietnam, one of Korea's three largest marts, needs to establish a T/S strategy in order to overcome the crisis situation in Vietnam market and succeed in business. BIG C Mart has over 40,000 diverse products needs to use a T/S strategy in order to effectively overcome the crisis situation in the Vietnamese market and to increase the possibility of business success. From the study findings and conclusions, various implications are derived. Vietnam is still very strong in socialism and regional characteristics, so it needs to build up close cooperation such as joint venture with local partners in the region and strategic alliances to increase the possibility of investment success.

• 대기
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• 제20권4호
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• pp.415-426
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• 2010

A Land cover map over East Asian region (Kongju national university Land Cover map: KLC) is classified by using support vector machine (SVM) and evaluated with ground truth data. The basic input data are the recent three years (2006-2008) of MODIS (MODerate Imaging Spectriradiometer) NDVI (normalized difference vegetation index) data. The spatial resolution and temporal frequency of MODIS NDVI are 1km and 16 days, respectively. To minimize the number of cloud contaminated pixels in the MODIS NDVI data, the maximum value composite is applied to the 16 days data. And correction of cloud contaminated pixels based on the spatiotemporal continuity assumption are applied to the monthly NDVI data. To reduce the dataset and improve the classification quality, 9 phenological data, such as, NDVI maximum, amplitude, average, and others, derived from the corrected monthly NDVI data. The 3 types of land cover maps (International Geosphere Biosphere Programme: IGBP, University of Maryland: UMd, and MODIS) were used to build up a "quasi" ground truth data set, which were composed of pixels where the three land cover maps classified as the same land cover type. The classification results show that the fractions of broadleaf trees and grasslands are greater, but those of the croplands and needleleaf trees are smaller compared to those of the IGBP or UMd. The validation results using in-situ observation database show that the percentages of pixels in agreement with the observations are 80%, 77%, 63%, 57% in MODIS, KLC, IGBP, UMd land cover data, respectively. The significant differences in land cover types among the MODIS, IGBP, UMd and KLC are mainly occurred at the southern China and Manchuria, where most of pixels are contaminated by cloud and snow during summer and winter, respectively. It shows that the quality of raw data is one of the most important factors in land cover classification.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.257-258
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• 2012

The SERS spectra of 4-aminobenzenethiol (ABT) have served as the "probe" molecule, which have helped spectroscopists to build up the electromagnetic (EM) and chemical (CHEM) enhancement mechanisms. In particular, the b2-peaks (9b, 3, and 19b) of the SERS spectra of ABT have been attributed to arise from the vibronic charge-transfer (CT) between Au or Ag surface and the ABT. Quite recently, however, Tian and co-workers [1] claimed that the b2-peaks are not the CT-enhanced spectra of ABT. Instead, these peaks arise from the 4,4'-dimercaptoazobenzenes (DMABs) that are produced by the oxidative coupling of two ABTs. Their claim is under intense debate currently. Herein, we studied spatially and temporally resolved SERS spectra of ABTs on Ag thin film (thickness of 10 nm), to investigate such claim. Herein, we present a series of additional evidences that strongly support that the b2 intensities of ABTs do not arise from the CT-enhancement: (1) the b2-peaks can be locally "activated" (i. e. turned on) irreversibly with focused laser radiation; (2) the TOF-SIM spectrometry on the activated region show depletion of ABT-Ag+ ions; and finally (3) the spatially resolved FT-IR spectra of the activated region show two pronounced peaks at 1377 cm-1 and 1460 cm-1, both of which can be assigned to the stretching mode of N=N bond. While the result does not disprove the existence of CT or CHEM enhancement in general, the results do show that previous interpretations of the spectra of ABTs should be re-interpreted.

• 한국경제지리학회지
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• 제25권1호
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• pp.1-22
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• 2022

본 연구의 목적은 Entrepreneurial Ecosystems의 핵심 개념을 분석하고 경제지리학 연구에서의 시사점을 제시하는 것이다. 기업가정신과 지리를 결합한 Entrepreneurial Ecosystems이 중요한 개념과 이론으로 부상하였는데, '행위자와 요인', '생산적', '영역'이라는 핵심 개념을 중심으로 고찰하였다. Entrepreneurial Ecosystems에서는 개인적·조직적·제도적 구성요소인 기업가, 스타트업, 기존 기업, 제도와 문화적 요소들이 상호연결되어 '기업가적 재순환'을 통해 커뮤니티를 형성하는 것이 중요하다. 이를 통해 로컬 지역에서 기업가적 문화를 기반으로 혁신적인 고성장 신생기업을 창출하는데 기여한다. 개념적 한계에도 불구하고 생산적 기업가정신(혁신창업)의 지리적·공간적 프로세스를 밝히고 지역기반 스타트업 생태계에 대한 정책적 시사점을 제시하기 위해 경제지리학 관점에서 이론적, 실증적 분석이 이루어져야 한다.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제11권1호
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• pp.29-34
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• 2022

모바일 디바이스 화면상의 클릭 가능한 객체를 인지하기 위한 데이터셋을 구축하고 새로운 네트워크 구조를 제안한다. 모바일 디바이스 화면에서 클릭 가능한 객체를 기준으로 다양한 해상도를 가진 디바이스에서 여러 애플리케이션을 대상으로 데이터를 수집하였다. 총 24,937개의 annotation data를 text, edit text, image, button, region, status bar, navigation bar의 7개 카테고리로 세분화하였다. 해당 데이터셋을 학습하기 위한 모델 구조는 Deconvolution Single Shot Detector를 베이스라인으로, backbone network는 기존 ResNet에 Squeeze-and-Excitation block을 추가한 Squeeze-and-Excitation networks를 사용하고, Single shot detector layers와 Deconvolution module을 Feature pyramid networks 형태로 쌓아 올려 header와 연결한다. 또한, 기존 input resolution의 1:1 비율에서 오는 특징의 손실을 최소화하기 위해 모바일 디바이스 화면과 유사한 1:2 비율로 변경하였다. 해당 모델을 구축한 데이터셋에 대하여 실험한 결과 베이스라인에 대비하여 mean average precision이 최대 101% 개선되었다.

• 한국식품위생안전성학회지
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• 제27권2호
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• pp.176-181
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• 2012

지속적인 식품안전 사고와 확대된 국제교역은 국제기구들로 하여금 식품안전 문제의 심각성을 자각하게 만들었다. 이로 인해 다양한 법 규제, 조치들, 협력 네트워크, 교육프로그램 등이 개발되었고, 특히 나라 간 식품안전 기술조화 및 전문인력 양성에 집중하고 있는 현실이다. APEC 또한 2007년 식품안전협력포럼(FSCF)를 신설하여 아시아 태평양 지역의 식품안전 향상을 위해 다양한 각도로 노력을 하고 있다. 2007년부터 현재까지 35개의 activity들이 진행되었고 APEC 프로젝트 절차에 따라 추가로 20여개가 준비 중이다. FSCF에서 수행되는 activity들은 생산에서 소비까지 식품안전 관리에 있어서 국제 최고의 기준과 조치들을 사용함으로 인해 공급사슬 내 에서의 이해당사자들의 능력을 키워 무역을 증진시키고 공중 보건을 지키는데 목적을 두고 있다. 이러한 전략적 목적을 완성하기 위해서 APEC 지역 내 식품안전 정부기관들, 산업체, 학계, 국제기구 등 전문가들 간의 다자간 협력 필요성이 요구되어 교육훈련기관네트워크(PTIN)가 차후에 만들어졌다. 이로 인해 식품 안전과 관련한 과학적 기술적 정보를 교류하고 안전관리 교육을 강화시킬 수 있게 되었다. 오늘날 식품안전 분야에서의 국제적인 공조는 필수적이다. 이에 우리나라가 APEC FSCF활동에 적극적으로 참여하여 아태지역 회원국들의 식품안전기술 향상에 기여할 뿐 아니라 국내 교육지원 프로그램과의 연계성을 검토해 볼 필요가 있다.

• 한국항만경제학회지
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• 제20권2호
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• pp.169-185
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• 2004

It is an urgent problem that Korea logistics enteprises' expansion of advance into China market and the logistics network establishment between Korea and China to back up the former are to be solved. Accordingly, the purpose of this study is to deduce the subjects to establish the logistics network between Korea and China, and to evaluate the priority order. The results of this research are as follows: First, we conducted face-to-face interviews on the advisery group in China and Korean enterprises which advanced into China, and drew out 6 promoting subjects to build the logistics network between the two. Second, the AHP model was adopted, which is a multi-criteria?multi-hierarchical decision making method, to draw out the weight and priority order of the deduced 6 promoting items. Third, the resultant priority order of the promoting subjects is as follows: No.1 - to establish the distribution & logistics support center by region(0.3900); No.2 - to support various taxes in investing the logistics business abroad(0.1980) ; No.3 - to improve the management of CIQ(0.1958); No.4 - to back up the joint-venture of logistics firms(0.1169); No.5 - to enhance trade and foreign policies to deregulate the entry into logistics markets(0.0536); No.6 - to construct the logistics information system of China(Northest Ssia)(0.0458). This paper resulted in finding out Korea logistics enterprises that have not secured their own inland-transport network in China and the actual difficulties of Korean enterprises with using the inferior network that advanced into China. These problems were developed into the analysis adopting the AHP method, and the significancy of this paper is to present the priority order of promoting problems using a sophisticated technique.

• 에너지공학
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• 제2권2호
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• pp.179-186
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• 1993

평판형 태양열 집열기에 적용되는 열파이프는 증발부에 상대적인 낮은 열유속으로 길이가 길고 가느다란 형상을 갖는다. 이러한 열파이프는 증발부의 하단부에서 액체 Pool이 형성하는 경향이 있다. 그리고 이 Pool에서 과열, 급속한 기포의 생성, 기포의 폭발적인 성장과정과 Flooding 등의 복잡한 증발과 유체 역학적 현상이 발생한다. 본 논문에서는 4개의 열파이프와 3개의 열사이폰을 이용하여 주 설계변수인 작동유체의 충전량과 위크의 설치 영역을 조절함으로써 이러한 문제를 해결하도록 하였다. 이에 대한 결과들은 다음과 같이 요약할 수 있다$^{1)}$ . 열파이프의 유효 열전도도는 단열부와 응축부에 위크를 제거함으로써 상당히 개선할 수 있었다$^{2)}$ .액체의 충전량은 위크를 적실수 있는 양보다 약 40%정도 증가시켜야 한다$_{3)}$ . 증발부에서 위크는 핵비 등의 단속적 발생에 의한 불안정한 작동과 포기 시동과정에서 응답시간을 줄이는데 유용한 효과를 갖는다.

• Nuclear Engineering and Technology
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• 제56권5호
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• pp.1822-1829
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• 2024

The search for materials that serve as good shields for radiation has become very important in light of the increasing exposure to ionizing radiation in various vital sectors. The aim is to search for novel materials with better radiation shielding properties that are stable, nontoxic, and abundant and environment friendly. The solidstate reaction approach has been used to synthesize a few ceramics, including BaZr_XTi_1-XO₃, Ba_1-XLa_XTiO₃ and Ba_1-XLa_XZr_XTi_1-XO₃ (with x = 0.10) i.eBaZr_0.10Ti_0.90O₃ (BZT), Ba_0.90La_0.10TiO₃ (BLT), and Ba_0.90La_0.10Zr_0.10Ti_0.90O₃ (BLZT). The density of the prepared samples varies from 6.3471 to 11.6003 g/cm³. The X-ray diffraction technique, shows strong peaks to confirm the crystalline structure of prepared ceramic samples. Using the G-P fitting approach, the advanced radiation shielding parameters (build-up factor) have been evaluated in the photon energy region of 1.5 keV-15 MeV. It is observed from the results that exposure buildup factor (EBF) and energy absorption buildup factor (EABF) are maximum for BLZT and has the minimum value for BZT in the entire photon energy regime. The results of this work should be useful in radiation shielding applications such as in industry, medicine, and nuclear engineering.