The effects of aerosols on the evapotranspiration

Yeojin Jung,Jhoon Kim,Qiaozhen Mu 한국기상학회 2008 한국기상학회 학술대회 논문집 Vol.2008 No.-

패킷 분류를 위한 이차원 이진 프리픽스 트리

정여진(Yeojin Jung),김혜란(Hyeran Kim),임혜숙(Hyesook Lim) 한국정보과학회 2005 정보과학회논문지 : 정보통신 Vol.32 No.4

인터넷은 그 급속한 성장과 더불어 점차 더 나은 서비스를 제공할 것을 요구받게 되었다. 이에 따라 차세대 인터넷 라우터들에서의 지능적인 패킷 분류 기능은 필수 불가결한 것으로 여겨지고 있다. 패킷 분류란 미리 정의된 classifier에 의거하여 입력된 패킷에 매치하는 가장 순위가 높은 룰을 찾는 과정이다. 기존에 나와있는 많은 패킷 분류 검색 구조들이 출발지, 목적지 프리픽스 필드에 기반하여 룰을 추려내는 접근 방법을 사용하고 있다. 그러나 대부분의 검색 구조들은 출발지, 목적지 프리픽스 검색을 위하여 트라이 구조에 바탕을 둔 순차적인 일차원 검색을 따르고 있으며, 매우 큰 메모리를 요구한다는 단점을 가지고 있다. 본 논문에서는 메모리를 매우 효율적으로 사용하면서도 출발지-목적지 프리픽스 쌍에 기반한 이차원 패킷 분류 구조를 제안하고자 한다. 코드워드로 구성된 이진 프리픽스 트리를 구성함으로써, 출발지 프리픽스 검색과 목적지 프리픽스 검색이 하나의 이진 트리를 통해 동시에 가능하도록 하였다. 또한 본 논문에서 제안하는 구조인 이차원 이진 프리픽스 트리는 트리 구조 내부에 비어있는 노드를 포함하고 있지 않으므로 트라이 구조가 가지고 있는 메모리의 비효율성 문제를 완전히 제거하였다. Demand for better services in the Internet has been increasing due to the rapid growth of the Internet, and hence next generation routers are required to perform intelligent packet classification. For a given classifier defining packet attributes or contents, packet classification is the process of identifying the highest priority rule to which a packet conforms. A notable characteristic of real classifiers is that a packet matches only a small number of distinct source-destination prefix pairs. Therefore, a lot of schemes have been proposed to filter rules based on source and destination prefix pairs. However, most of the schemes are based on sequential one-dimensional searches using trie which requires huge memory. In this paper, we proposea memory-efficient two-dimensional search scheme using source and destination prefix pairs. By constructing binary prefix tree, source prefix search and destination prefix search are simultaneously performed in a binary tree. Moreover, the proposed two-dimensional binary prefix tree does not include any empty internal nodes, and hence memory waste of previous trie-based structures is completely eliminated.

Research Trends in Family Centered Care for Children with Chronic Disease: Keyword Network Analysis

YeoJin Im,Sunyoung Jung,Jeong Hee Eom,Young Ah Park 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10

Aim(s): Family Centered Care is an approach to promote the health and well-being of children with chronic disease and their families. It helps to maintain qualified care in their daily lives with mutually beneficial partnerships among health care providers, patients, and families. We aimed to explore the knowledge components, structure, and research trends related to family-centered care for children with chronic disease by utilizing the advantages of Keyword Network Analysis (KNA). Method(s): Three stages of keyword co-occurrence network analysis include searching and screening of relevant studies, keyword extraction and refinement, and data analysis and visualization. A total of 3,419 raw keywords was exacted from 1,494 studies, extracted from 3012 published articles on family-centered care with chronic illness published from 2010 to 2019 searched from seven databases, with 9,732 frequencies. We selected 289 keywords having a higher frequency than the average. Network centrality analysis, cohesive subgroup analysis, and trend analysis by period using UCINET 6 and Gephi software were conducted. Result(s): The core keywords were child, adolescence, parent, and disabled. Identified keywords with the high value in the between centrality were chronic disease, caregiver, quality of life, qualitative research, pediatric, and family, which indicates how much a keyword performs as an intermediary among keywords. Four cohesive subgroups in the network based on 50 highly ranked in degree centrality included groups of keywords on psychological and developmental problems, community care, accessibility, communication, decision making, transition, children with special health care needs, and palliative care. Research trends in the three phases of a recent decade have been changed. Conclusion(s): Knowledge components and structure in the family-centered care for children with chronic disease have been varied. Based on the systematic understanding of the context of the knowledge structure, the provision for future research direction on children with chronic diseases based on family-centered care is suggested.

모바일 환경을 고려한 효율적인 전자수표시스템

이여진(Yeojin Lee),유성진(Sungjin Ryu),정일용(Ilyong Jung) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A

무선 인터넷 시장의 급속한 성장과 함께 이에 맞는 실용적인 전자지불 방식의 요구가 커지고 있다. 많은 전자지불방식 중에서 전자수표시스템은 계산량이나 정보교환량 측면에서 전자동전방식보다 효율적인 지불수단이다. 그럼에도 불구하고 제한되어 있는 액면가 문제나 지불과정에서 발생하는 거스름의 재사용 문제로 활성화되지 못하고 있다. 이 시스템은 모바일 단말기의 한계에 따른 연산 속도를 고려하였으며, 액면가나 거스름과 같은 문제점을 해결하였다. 부분은닉서명 기법을 이용하여 수표의 액면가의 임의의 표현이 가능하며 거스름의 형태가 처음 발행 받은 수표와 같아 재사용이 가능하게 된다. 이때 거스름으로 재발행 받은 수표는 익명성을 보장하여 어떤 수표의 거스름인지를 알 수 없게 된다.

Secure authentication system that generates seed from biometric information

Kim, Yeojin,Ahn, Jung-Ho,Byun, Hyeran The Optical Society 2005 Applied Optics Vol.44 No.5

<P>As biometric recognition techniques are gradually improved, the stability of biometric authentication systems are enhanced. Although bioinformation has properties that make it resistant to fraud, biometric authentication systems are not immune to hacking. We show a secure biometric authentication system (1) to guarantee the integrity of biometric information by mixing data by use of a biometric key and (2) to raise recognition rates by use of bimodal biometrics.</P>

Highly Sensitive Determination of Symmetric Dimethylarginine, Promising Bio-marker of Renal Function

Jimin Oh,Yeojin Jung,Insook Rhee 한국분석과학회 2019 학술대회논문집 Vol.2019 No.11

Application of Ionic Liquids in Hydrometallurgy

Park, Jesik,Jung, Yeojin,Kusumah, Priyandi,Lee, Jinyoung,Kwon, Kyungjung,Lee, Churl Kyoung MDPI 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.9

<P>Ionic liquids, low temperature molten salts, have various advantages manifesting themselves as durable and environmentally friendly solvents. Their application is expanding into various fields including hydrometallurgy due to their unique properties such as non-volatility, inflammability, low toxicity, good ionic conductivity, and wide electrochemical potential window. This paper reviews previous literatures and our recent results adopting ionic liquids in extraction, synthesis and processing of metals with an emphasis on the electrolysis of active/light, rare earth, and platinum group metals. Because the research and development of ionic liquids in this area are still emerging, various, more fundamental approaches are expected to popularize ionic liquids in the metal manufacturing industry.</P>

Analysis of Natural Rocks Collected From Uranium Deposits in Okcheon Metamorphic Zone Using Raman Spectroscopy

Euo Chang Jung,Hee-Kyung Kim,YeoJin Ju,Dawoon Jeong,Min-Hoon Baik,Ji-Hun Ryu,Jang-Soon Kwon 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

Raman characteristics of various minerals constituting natural rocks collected from uranium deposits in Okcheon metamorphic zone in Korea are presented. Micro-Raman spectra were measured using a confocal Raman microscope (Renishaw in Via Basis). The focal length of the spectrometer was 250 mm, and a 1800 lines/mm grating was installed. The outlet of the spectrometer was equipped with a CCD (1,024?256 pixel) operating at -70°C. Three objective lenses were installed, and each magnification was ?10, ?50, and ?100 times. The diameter of the laser beam passing through the objective lens and incident on the sample surface was approximately 2 ?m. The laser beam power at 532 nm was 1.6 mW on the sample surface. Raman signal scattered backward from the sample surface was transmitted to the spectrometer through the same objective lens. To accurately determine the Raman peak position of the sample, a Raman peak at 520.5 cm-1 measured on a silicon wafer was used as a reference position. Since quartz, calcite, and muscovite minerals are widely distributed throughout the rock, it is easy to observe with an optical microscope, so there is no difficulty in measuring the Raman spectrum. However, it is difficult to identify the uraninite scattered in micrometer sizes only with a Raman microscope. In this case, the location of uraninite was first confirmed using SEM-EDS, and then the sample was transferred to the Raman microscope to measure the Raman spectrum. In particular, a qualitative analysis of the oxidation and lattice conditions of natural uraninite was attempted by comparing the Raman properties of a micrometer-sized natural uraninite and a laboratory-synthesized UO2 pellet. Significantly different T2g/2LO Raman intensity ratio was observed in the two samples, which indicates that there are defects in the lattice structure of natural uraninite. In addition, no uranyl mineral phases were observed due to the deterioration of natural uraninite. This result suggests that the uranium deposit is maintained in a reduced state. Rutile is also scattered in micrometer-sizes, similar to uraninite. The Raman spectrum of rutile is similar in shape to that of uraninite, making them confused. The Raman spectral differences between these two minerals were compared in detail.

Room Temperature Magnesium Electrorefining by Using Non-Aqueous Electrolyte

Jesik Park,Yeojin Jung,Priyandi Kusumah,Bonita Dilasari,Heesuk Ku,Hansu Kim,Kyungjung Kwon,Churl Kyoung Lee 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5

The increasing usage of magnesium inevitably leads to a fast increase in magnesium scrap, and magnesium recycling appears extremely beneficial for cost reduction, preservation of natural resources and protection of the environment. Magnesium refining for the recovery of high purity magnesium from metal scrap alloy (AZ31B composed of magnesium, aluminum, zinc, manganese and copper) at room temperature is investigated with a non-aqueous electrolyte (tetrahydrofuran with ethyl magnesium bromide). A high purity (99.999%) of electrorefined magneisum with a smooth and dense surface is obtained after potentiostatic electrolysis with an applied voltage of 2 V. The selective dissolution of magnesium from magnesium alloy is possible by applying an adequate potential considering the tolerable impurity level in electrorefined magnesium and processing time. The purity estimation method suggested in this study can be useful in evaluating the maximum content of impurity elements.

수술실 간호사의 조직시민행동 영향요인

윤미정,임여진,Yoon, Mi Jung,Im, YeoJin 경희대학교 동서간호학연구소 2022 동서간호학연구지 Vol.28 No.2

Purpose: This study aimed to identify the factors related to the organizational citizenship behavior of nurses in the operating room (OR). These factors include positive psychological capital, perceived organizational culture, and job characteristics. Methods: A descriptive correlational study design was used. A total of 185 OR nurses from nine general and advanced general hospitals across three metropolitan areas in South Korea completed the questionnaires. The questionnaires included items on organizational citizenship behavior, positive psychological capital, organizational culture, and job characteristics. Descriptive statistics and multiple regression analysis were conducted using SPSS/WIN 21.0. Results: The mean score for organizational citizenship behavior was 3.62 out of 5. Positive psychological capital, relationship-oriented organizational culture, and feedback on job characteristics were verified as influencing factors of OR nurses' organizational citizenship behaviors. The explanatory power of this regression model was 48.2%. Conclusion: Reinforcement of positive psychological capital of individual OR nurses and organizational efforts to endorse relationship-oriented organizational culture is required. It follows that OR nurses' organizational citizenship behavior can be enhanced based on mutual trust, cohesiveness, and feedback on their work performance.