日本 海上自衛隊의 戰力과 韓國安保

유지현 해군대학 1992 海洋戰略 Vol.- No.75

디지털 기술을 활용한 바이러스 확산 방지 시스템 설계 및구현에 관한 연구

유지현 한국전기전자학회 2022 전기전자학회논문지 Vol.26 No.4

Including the COVID-19 crisis, humanity is constantly exposed to viral infections, and efforts are being made toprevent the spread of infection by quickly isolating infected people and tracing contacts. Passive epidemiologicalinvestigations that confirm contact with an infected person through contact have limitations in terms of accuracyand speed, so automatic tracking methods using various digital technologies are being proposed. This paper verifycontact by utilizing Bluetooth Low Energy (BLE) technology and present an algorithm that identifies close contactthrough analysis and correction of RSSI (Received Signal Strength Indicator) values. Also, propose a system thatcan prevent the spread of viruses in a centralized server structure. COVID-19 사태를 비롯하여 인류는 지속적인 바이러스 감염에 노출되고 있고 감염자를 신속하게 격리하고 접촉자를 추적하여감염 확산을 방지를 위한 노력이 진행되고 있다. 연락을 통해 확진자 접촉을 확인하는 수동적인 역학조사는 정확성과 신속성 측면에서 한계가 있어 다양한 디지털 기술을 활용한 자동적인 추적 방법이 제안되고 있다. 본 논문에서는 저전력 블루투스 BLE(Bluetooth Low Energy) 기술을 활용하여 접촉을 확인하고 RSSI (Received Signal Strength Indicator) 값에 대한 분석과 보정을 통해 밀접 접촉을 식별하는 알고리즘을 제시하고, 중앙집중형 서버 구조의 바이러스 확산을 방지할 수 있는 시스템을 제안하고자한다.

순환 합성곱 신경망를 이용한다채널 뇌파 분석의 간질 발작 탐지

유지현 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.4

In this paper, we propose recurrent CNN(Convolutional Neural Networks) for detecting seizures among patients usingEEG signals. In the proposed method, data were mapped by image to preserve the spectral characteristics of the EEGsignal and the position of the electrode. After the spectral preprocessing, we input it into CNN and extracted the spatialand temporal features without wavelet transform. Results from the Children's Hospital of Boston Massachusetts Institute of Technology (CHB-MIT) dataset showed asensitivity of 90% and a false positive rate (FPR) of 0.85 per hour. 본 논문에서는 뇌파 신호를 이용하여 환자의 경련을 감지하는 순환 CNN (Convolutional Neural Networks)을 제안한다. 제안 된 방법은 뇌파 신호의 스펙트럼 특성과 전극의 위치를 보존하기 위해 영상으로 데이터를 매핑하여 처리하였다. 스펙트럼 전처리 과정을 거친 후 CNN에 입력하고 공간 및 시간 특성을 웨이블릿 변환(wavelet transform)없이 추출하여 발작을검출하였다. 여기에 사용된 보스턴 매사추세츠 공과 대학 (Boston Massachusetts Institute of Technology, CHB-MIT) 아동병원의 데이터셋 결과는 시간당 0.85의 민감도와 90 %의 위양성 비율 (FPR)을 보였다.

유도계획과 QM 도구들을 활용한 신제품 개발과정의 혁신 전략

유지현,정태욱,송인철,오현승,이세재,조진형 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.4

The new businesses started by the companies usually results in being unsuccessful. The main reasons for that are either aiming targeting wrong customers, unsatisfaction of customers’ requesting quality standards, or taking wrong actions against the competitors in the market. Therefore, companies should aim the targets for the newly developing products based on the fulfilling values for the customers when they start the new businesses, and should take good cares for risk managements at the each step of the new business to prevent the failure in advance. In addition to that, the companies starting new businesses not only need to take the customers attributes (CA) into account, but they also should apply the new technologies as one system to initiate a new business to satisfy the basic wants of the customers. This article suggests the New Product Development Pursuing Model using the Indicative Planning methodology and the Quality Management tools. The New Product Development Pursuing Model would be completed by the following steps as below; 1. Drawing the CTQ (Critical To Quality) for setting up the new product development objectives by : i) using the VOC (Voice Of Customers) obtained by the QFD (Quality Function Deploypment) if the market is mature, ii) applying AHP (Analytic Hierarchy Process) to information in the QIS (Quality Information System) if the market is unmature to get enough need information of the customers. 2. Risk Management in NPD : The NPD pursuing model consisted of the IP (indicative planning) is suggested not by the process of top-down-way mandatory planning process, but by the tools used in the administrative science and economic fields, namely by governance. The companies could apply innovative methodology for new products development processes to fulfil the customers satisfaction in the fields, through the CA (Contingency Approach) of the NPD (New Product Development) process.

감성 척도 맵 개발 및 패션 브랜드의 감성이미지 비교 연구 - 브랜드 이미지와 브랜드 웹사이트 배색 이미지를 중심으로 -

유지현,Yu, Ji-Hun 복식문화학회 2010 복식문화연구 Vol.18 No.2

The purpose of this study was to propose some plan which could satisfy consumer's expectation emotional needs by comparing emotional scale between fashion brand image and brand website coloration image. For this study, 12 brand websites within four fashion zone, men's clothing, women's clothing, casual wear, and sports wear were chosen. The questionnaires were comprised of 27 emotional adjectives which were selected from previous studies. The questionnaires were distributed to university students and office workers for 3 to 17 on September. Among them, 118 questionnaires were analyzed by SPSS tool. The qualitative analysis for emotional adjective sorting, content analysis for website color chip sorting, and quantitative analysis for consumers were used in this study. Some differences exist between brand image and website coloration band image as the result. As the numbers of internet user became larger, the costumer's emotional image which gives maximum satisfaction is getting more important in fashion brand website. Therefore, fashion website managers should satisfy consumers with functional and emotional needs.

마분 퇴비 시용 수준이 이탈리안 라이그라스 생산성과 용탈수 성분에 미치는 영향

유지현,박남건,우제훈,안희권,양병철,Yoo, Ji-Hyun,Park, Nam-Geon,Woo, Jae-Hoon,Ahn, Hee-Kwon,Yang, Byoung-Chul 한국초지조사료학회 2020 한국초지조사료학회지 Vol.40 No.2

This study was conducted to figure out the productivity of Italian ryegrass(IRG) and leaching water characteristics based on horse manure compost level in Jeju. This study was conducted for about six months. Six treatments were established : non-fertilizer(NF), chemical fertilizer 100%(CF), horse manure compost 50% and chemical fertilizer 50% combination(Combination), horse manure compost with 50% of nitrogen (50%), 100% of nitrogen(100%), 150% of nitrogen(150%). The highest amount of dry matter yield of IRG was revealed in CF(11,965±564 kg/ha), and both 150% and Combination were second(p<0.05). Nitrate leaching tended to increase until the third analysis and then decreased. There were not significantly differences among mean nitrate concentrations. The findings of the study suggest that horse manure compost with 50% of nitrogen be applied for IRG as basal fertilization and then 50% of chemical fertilizer be applied as top fertilization.

수술가이드를 이용한 무피판 임플란트 술식에서 임플란트 드릴링이 열발생에 미치는 효과

유지현,정승미,최병호,주상돈,Yoo, Je-Hyeon,Jeong, Seung-Mi,Choi, Byung-Ho,Joo, Sang-Don 대한치과보철학회 2013 대한치과보철학회지 Vol.51 No.1

Purpose: The aim of this study was to evaluate the heat generation in bone in vitro during the guided flapless drilling procedure and the effect of drilling methods on the heat generation. Materials and methods: A model that has missing the first and second mandibular molars bilaterally was used. In group A, classical flap implant surgery was performed. In group B, flapless implant surgery using surgical guide was performed. In group C, flapless implant surgery using surgical guide without up-and-down pumping motion was performed. Temperature was measured with k-type thermocouple and a real-time digital thermometer. The thermocouples were placed at 0.5 mm away from the osteotomy area at the depths of 3 mm and 6 mm. The measured values were evaluated with independent t-test. Results: The mean temperature generated was $27.2^{\circ}C$ ($SD{\pm}2.1^{\circ}C$) and $27.5^{\circ}C$ ($SD{\pm}2.3^{\circ}C$) for groups A and B, respectively. These differences were not statistically significant. In group C, the mean temperature was $37.0^{\circ}C$ ($SD{\pm}3.4^{\circ}C$). There were statistically significant differences between groups B and C with respect to the mean temperature. Conclusion: These findings suggest that guided flapless drilling with up-and-down pumping motion may not significantly increase the bone temperature.

부모 지지, 문화지능, 다문화 수용성 및 학교적응 간의 구조적 관계 : 다문화교육 정책학교 초등학생을 중심으로

유지현,안도희 다문화아동청소년연구원 2023 다문화아동청소년연구 Vol.8 No.1

본 연구에서는 ‘다문화교육 정책학교’로 지정된 서울시 소재 초등학교 5, 6학 년에 재학 중인 초등학생 452명(다문화학생 186명, 비다문화학생 266명)을 대상 으로 다문화 여부에 따른 두 집단 간 부모 지지, 문화지능, 다문화 수용성 및 학교적응 수준에 차이가 있는지를 살펴보고, 이들 변인들 간의 구조적 관계를 탐색해보고자 하였다. 본 연구결과는 다음과 같다. 첫째, 학생이 지각한 부모지 지, 문화지능, 다문화 수용성 및 학교적응 간에 상호 정적 상관이 있는 것으로 나타났다. 둘째, 다문화 학생은 비다문화 학생에 비해 부모 지지와 학교적응 수 준을 더 낮게 지각하는 것으로 나타났다. 셋째, 부모 지지는 학교적응에 직접적 으로 긍정적인 영향을 미치며 문화지능과 다문화 수용성을 거쳐 학교적응에 간 접적으로 긍정적인 영향을 미치는 것으로 나타났다. 문화지능은 다문화 수용성 에 긍정적인 영향을 미치며, 부모 지지는 문화지능을 거쳐 다문화 수용성에도 간접적으로 긍정적인 영향을 미치는 것으로 나타났다. 본 연구가 다문화 밀집지 역의 학교적응 수준을 높일 수 있도록 다문화정책의 기초자료로 활용될 수 있 을 것으로 여겨진다. 또한 학생의 다문화 역량을 증진시키기 위한 다문화교육 프로그램 개발 방안을 탐색하는데 도움을 줄 수 있을 것으로 기대된다. The study examined the structural relationships between parental support, cultural intelligence, multicultural acceptance and school adjustment. The participants were 452 elementary school students of grades 5th and 6th in Seoul, Korea. Results were as follows. Parental support showed positive correlations with cultural intelligence, multicultural acceptance, and school adjustment. Cultural intelligence showed positive correlations with multicultural acceptance and school adjustment. Also, multicultural acceptance showed positive correlations with school adjustment. There were significant differences between immigrant and non-immigrants students in parental support and school adjustment. Parental support directly influenced school adjustment and indirectly influenced school adjustment through cultural intelligence and multicultural acceptance. These findings imply that parental support, cultural intelligence, and multicultural acceptance play important roles in school adjustment. It is expected that the results of this study will serve as fundamental data to enhance multicultural education policies.

LTE/5G 네트워크 백홀(Backhaul)의 서비스 품질진단기법에 관한 연구

유지현 한국전기전자학회 2023 전기전자학회논문지 Vol.27 No.4

With the evolution of communication networks, there is a growing demand for stable high-speed data connectionsto support services relying on large-capacity data. The increasing volume of packet data aggregated from userdevices underscores the significance of quality diagnostics for the backhaul network, an intermediate link transmittingdata to the core network. This paper conducts empirical research on techniques to diagnose issues within thebackhaul network through practical case studies, through diagnosing various factors such as circuit bandwidth,speed disparities within switches, network segment-specific buffer sizes, routing policies, among other factors thatcould potentially cause RTT (Round Trip Time) delays and performance degradation. 통신 망의 진화에 따라 대용량 데이터 기반의 안정적인 고속 데이터 연결이 필요한 서비스들이 증가하고 있다. 사용자의 단말로부터 취합된 패킷 데이터의 용량이 증가하면서 코어 네트워크로 전달하는 중간 링크인 백홀 네트워크의 지연에 대한 품질진단의 중요성이 대두되었다. 본 논문에서는 응용서비스 품질에 영향을 미치는 RTT(Round Trip Time) 지연과 성능저하의 원인이 될 수 있는회선 대역폭(Bandwidth) 및 스위치 내 속도 불일치, 구간별 버퍼(Buffer) 사이즈, 라우팅 정책 등 여러 인자의 진단을 통하여 백홀네트워크에서 문제를 해결할 수 있는 기법에 관해 실제 사례를 통해 연구를 진행하였다.

대학생의 학습민첩성이 비인지적 핵심역량에 미치는 영향 -자기관리역량 및 대인관계역량을 중심으로-

유지현,심현애 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.2

The purpose of this study is to examine the effect of college students' learning agility on non-cognitive core competencies, and to provide implications to support development of core competencies in college students. To this end, data from 68 students attending University S were analyzed. For non-cognitive core competency measurement, we utilized self-management and interpersonal competency results from an online college student core competency diagnostic test (K-CESA) developed by Korea Research Vocational Education & Training. The analysis found that learning agility had a significant effect on both self-management competency and interpersonal competency. Learning agility had a significant impact on self-directed learning ability, emotional self-regulation, and goal performance from among the self-management competencies, and had a significant impact on emotional bonding, intervention, leadership, and organizational understanding from among the interpersonal competencies. Based on the results of this study, a comparison of program support and college-life support policies is proposed to enhance non-cognitive core competencies in college students.