저속 무전 통신 환경에 적용 가능한 키 관리 방식

김송이,이광우,정한재,조영준,차욱재,김승주,원동호,Kim, Song-Yi,Lee, Kwang-Woo,Jeong, Han-Jae,Cho, Young-Jun,Cha, Wook-Jae,Kim, Seung-Joo,Won, Dong-Ho 한국정보처리학회 2009 정보처리학회논문지 C : 정보통신,정보보안 Vol.16 No.4

무선 통신 기술의 발달은 기존 유선 통신 사용자에게 이동성과 접근 편리성을 제공하였다. 무선 센서 네트워크 기술은 대표적인 무선 통신기술의 하나로, 센서 노드간의 통신에 에러가 빈번하고 통신 속도가 느린 저속 환경이며, 노드의 자원 제약 및 컴퓨팅 능력의 한계로 인해 유선 네트워크 환경에서 설계된 보안 메커니즘을 그대로 적용하는 것이 어렵다. 이러한 무선 센서 네트워크의 환경적인 제약사항이 무전 통신 환경과 유사함에 착안하여 무선 센서 네트워크 기술을 참고하여, 무전 통신 환경에 적용 가능한 효율적인 키 관리 기법을 제안하고자 한다. 본 논문에서 제안하는 방식은 일대일 통신에서 사용될 pair-wise key 설정 및 갱신, 일대다 통신에 사용될 그룹키 설정 및 갱신을 제공하며, 그룹 단위의 무전기 추가가 가능하다는 장점을 갖는다. 제안하는 master key 기반의 키 관리 방식은 군(軍)에서의 특수한 작전 수행 및 비밀 통신이 요구되는 무전 통신 환경에 활용될 수 있다. The development of wireless communications provides mobility and accessibility to the wire communication users. Wireless sensor network is one of the leading wireless communication techniques. The security mechanism for wired network communication cannot be applied to wireless sensor network because of the limited resource and computing capability of nodes. Furthermore, communication errors frequently occur and the speed is low. Thus, efficient key management scheme is required in low-speed environment. In this paper, we proposed an efficient and secured master key-based scheme compared to the existing scheme. The advantage of our scheme is that establishing and renewing the pair-wise key is possible. In addition, it provides functions such as establishing group keys and renewing it. Furthermore, adding nodes is enabled through our scheme. The master key-based scheme can be applied to military operations and to radio communications for confidential communications.

언어분석기법을 활용한 치과위생사의 의료인화 관련 신문기사 분석: R 프로그램 이용

김송이,윤가림,강동현,김수진,이시은,장수빈,홍성민,황지훈,김남희,Kim, Song-Yi,Yoon, Ga-Rim,Kang, Dong-Hyun,Kim, Su-Jin,Lee, Si-Eun,Jang, Soo-Bin,Hong, Seong-Min,Hwang, Ji-Hoon,Kim, Nam-Hee 한국치위생학회 2017 한국치위생학회지 Vol.17 No.5

Objectives: The purposes of this study were to analyze the trade newspapers related to 'recognition of the dental hygienist as the healthcare professional' using R program and to identify opinions of groups concerned with dental hygienists. Methods: This study was designed with contents analysis and cross-sectional. The subjects of the study were the articles for the last three years in medical and dental newspapers about the recognition of the dental hygienist as the healthcare professional. The collected articles were categorized and classified for each group's opinions about the issue. The key words were extracted according to the priorities of the opinions of agreement and disagreement. They were visualized after frequency analysis using R, a big data analysis program. Results: A total of 237 newspaper articles were extracted among 270 ones containing opinions. 245 were positive opinions and 25 were negatives. The main key words of the agreement were 'Amendment of Medical Law', 'Medical Practice', and 'Legal Guarantee of the Practice'. Advocates addressed that the issues should be resolved with the amendment of the law, as dental hygienists are not guaranteed to work based on the current law although they are actually doing the medical practices. Main key words of disagreement were 'Legal Guarantee of the Practice', 'Revision of Medical Technician Law', and 'Review of Job Type'. They described that the problem can be resolved by revising medical technicians act, and it needs to consider as job types of all healthcare professional. Conclusions: In the group who showed the positive opinions, it is possible to utilize measures such as promoting the cooperation of dental hygienists and developing public consensus through publicity.

SOM기반 특징 신호 추출 기법을 이용한 불균형 주기 신호의 이상 탐지

김송이,강지훈,박종혁,김성식,백준걸,Kim, Song-Ee,Kang, Ji-Hoon,Park, Jong-Hyuck,Kim, Sung-Shick,Baek, Jun-Geol 한국시뮬레이션학회 2012 한국시뮬레이션학회 논문지 Vol.21 No.2

In this paper, a feature signal extraction method is proposed in order to enhance the low performance of fault detection caused by unbalanced data which denotes the situations when severe disparity exists between the numbers of class instances. Most of the cyclic signals gathered during the process are recognized as normal, while only a few signals are regarded as fault; the majorities of cyclic signals data are unbalanced data. SOM(Self-Organizing Map)-based feature signal extraction method is considered to fix the adverse effects caused by unbalanced data. The weight neurons, mapped to the every node of SOM grid, are extracted as the feature signals of both class data which are used as a reference data set for fault detection. kNN(k-Nearest Neighbor) and SVM(Support Vector Machine) are considered to make fault detection models with comparisons to Hotelling's $T^2$ Control Chart, the most widely used method for fault detection. Experiments are conducted by using simulated process signals which resembles the frequent cyclic signals in semiconductor manufacturing. 본 연구는 공정신호가 불균형 데이터인 경우 이상 탐지 알고리즘의 성능 개선을 위한 특징 신호 추출 기법을 제안한다. 불균형 데이터란 범주 구분 문제에서 하나의 범주의 속하는 데이터의 비율이 다른 범주의 데이터에 비해 크게 차이나 이상 탐지성능이 크게 저하되는 경우를 의미한다. 공정이 운영되는 경우 얻을 수 있는 이상 신호의 수는 정상 신호에 비해 매우 적기에 이러한 문제를 해결하여 이상 탐지 기법을 적용하는 것은 매우 중요하다. 불균형 문제 해결을 위해 SOM(Self-Organizing Map) 알고리즘을 이용하여 각 노드에 대응되는 가중치를 특징 신호로 간주하여 정상 데이터와 이상 데이터의 비율을 맞춘다. 특징 신호 데이터 집단의 이상 탐지를 위해 클래스 분류 기법인 kNN(k-Nearest Neighbor)과 SVM(Support Vector Machine)을 적용하여 이를 공정 신호 이상탐지를 위해 주로 사용하는 Hotelling's $T^2$ 관리도와 성능을 비교한다. 반도체 공정에서 발생한다고 알려진 공정 신호를 모사하여 신호 알고리즘 성능의 우수성을 검증한다.

방전플라즈마소결을 이용한 Ni계 비정질 복합재의 제조

김송이,금보경,이민하,김범성,Kim, Song Yi,Guem, Bo Kyeong,Lee, Min Ha,Kim, Bum Sung 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.1

A bulk metallic glass-forming alloy, $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders was used for good commercial availability and good formability in supercooled liquid region. In this study, the Ni-based metallic glass was synthesized using by high pressure gas atomized metallic glass powders. In order to create a bulk metallic glass sample, the $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders with ball-milled Ni-based amorphous powder with 40%vol brass powder and Cu powder for 20 hours. The composite specimens were prepared by Spark Plasma Sintering for the precursor. The SPS was performed at supercooled liquid region of Ni-based metallic glass. The amorphous structure of the final sample was characterized by SEM, X-ray diffraction and DSC analysis.

기계적 합금화 공정에 의한 Hf계 비정질 분말의 미세변형거동 관찰

김송이,이아영,차은지,권도훈,홍성욱,이민우,김휘준,이민하,Kim, Song-Yi,Lee, A-Young,Cha, Eun-Ji,Kwon, Do-Hun,Hong, Sung-Uk,Lee, Min-Woo,Kim, Hwi-Jun,Lee, Min-Ha 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3

In this study, we investigate the deformation behavior of $Hf_{44.5}Cu_{27}Ni_{13.5}Nb_5Al_{10}$ metallic glass powder under repeated compressive strain during mechanical milling. High-density (11.0 g/cc) Hf-based metallic glass powders are prepared using a gas atomization process. The relationship between the mechanical alloying time and microstructural change under phase transformation is evaluated for crystallization of the amorphous phase. Planetary mechanical milling is performed for 0, 40, or 90 h at 100 rpm. The amorphous structure of the Hf-based metallic glass powders during mechanical milling is analyzed using differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Microstructural analysis of the Hf-based metallic glass powder deformed using mechanical milling reveals a layered structure with vein patterns at the fracture surface, which is observed in the fracture of bulk metallic glasses. We also study the crystallization behavior and the phase and microstructure transformations under isothermal heat treatment of the Hf-based metallic glass.

한국 침구 전문서 『영소침구경』 연구

김송이,김종현,Kim, Song-Yi,Kim, Jong-Hyun 경락경혈학회 2017 Korean Journal of Acupuncture Vol.34 No.3

Objectives : Previous research on texts specializing in acupuncture and moxibustion in Korea have mostly been focused on those written in the Joseon period, leaving an academic void in the modern and contemporary eras. This research on the "Yeongsochimgugyeong" was undertaken to help readers' understanding of the text and to provide basic material for further research on modern-contemporary education of acupuncture and moxibustion. Methods : The original text of "Yeongsochimgugyeong" was examined along with books and news articles on related people. Information that was difficult to obtain through written documents was supplemented by interviews with people who knew about the situation at the time. The findings were organized as 1) the author and related people and 2) introduction of "Yeongsochimgugyeong". Results and Conclusions : The original text of "Yeongsochimgugyeong" was written by teacher Jeon, Gwangok, interpreted and annotated by his disciple Gwon, Yeongjun. It is presumed that they wrote this book as educators of Korean medicine for educational purposes on acupuncture and moxibustion before and after the Japanese colonial era. The book is consisted of an overview of meridianology, details on points and meridians, supplementing and draining methods, similar to the current text book. The contents and expressions of "Yeongsochimgugyeong" reflect the state of acupuncture and moxibustion education of the early and mid $20^{th}$ century, making it a valuable resource.

한국인 저자 전거에 관한 국가간 비교 연구

김송이,정연경,Kim, Song-Ie,Chung, Yeon Kyoung 한국문헌정보학회 2015 한국문헌정보학회지 Vol.49 No.1

저자 전거 관리는 저자 정보에 대한 관리뿐만 아니라, 저자명의 이형을 모아 접근점을 제공한다는 점에서 이용자에게 유용하다. 본 연구는 한국문학번역원의 한국문학 작가명 데이터베이스(문인DB)와 한국과 미국, 일본의 국립도서관이 구축한 한국인 저자 전거레코드의 구축 현황을 비교 분석하여 한국인 저자 전거의 현황과 문제점을 살펴보았다. 연구 결과, 문인DB는 번역출간도서의 정보가 상당수 기입되지 않았고 미의회도서관과 일본 국립국회도서관의 전거레코드는 저자명 누락, 잘못된 저자명 기입, 출생년과 사망년의 미표기 등 항목 누락과 오기가 발견되었으며, 국립중앙도서관은 영문 이형 및 한자 이형이 기입되지 않았다. 이러한 문제를 해결하기 위해 문인DB 정보의 수정 및 갱신, 국립중앙도서관의 전거레코드 공개, 한국문학번역원과 국립중앙도서관 등 주요 기관을 중심으로 한 국제전거 파일(VIAF)의 참가를 개선방안으로 제안하였다. Name Authority Control is useful not only to manage author information but also to gather other names of authors in order to provide access points in libraries and other institutes. The purpose of this study is to find problems through comparing and analyzing Literature Translation Institute of Korea Author Database, Korean name authority records of national libraries in the U. S., Japan and Korea. The results of the study are as follows. First, Literature Translation Institute of Korea Author Database missed some useful information about Korean writers in translated books in other countries. Second, the name authority file of Library of Congress and National Diet Library did not include the variant names, dates of authors' birth and death date, and filled out incorrect variant names with some birth and death dates. Third, English and Chinese character variants of Korean authors were not found in the National Library of Korea. To solve these problems, revisions of Korean author database, open access to National Library of Korea name authority file, and a strong participation of VIAF were suggested.

Do Different Numbers of Acupuncture Treatments Have Different Effects on Migraine Symptoms?: Lessons Learned from Recent Research Published in Acupuncture in Medicine

김송이,Kim, Song-Yi Society for Meridian and Acupoint 2022 Korean Journal of Acupuncture Vol.39 No.3

외피의 단열성능에 따른 수직형 스마트팜의 에너지분석

김송이(Song yi Kim),김한돈(Han Don Kim),최세은(Se Eun Choi),조소운(So un Jo),김서현(Seo Hyun Kim),김지민(Ji Min Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

In a vertical smart farm, the amount of light is controlled by multiple artificial light, so the amount of heat generated by artificial light has a great influence on the indoor temperature. This study aims at Energy Analysis of Vertical Smart Farms based on the Insulation of the Envelope. The Cases were divided into four according to the type of wall, roof, and floor insulation of the building, and each case was divided into four temperatures. By simulating this with TRNSYS, the cooling load was calculated. In each case, the thickness increased as the insulation level decreased based on the Building energy efficiency rating(에너지절약설계기준). But regardless, as the insulation level decreased, the cooling load increased. There was a clear difference according to the insulation grade in summer than in winter. The lower the insulation grade, the greater the difference in cooling load in summer and winter. Based on this study, we propose appropriate insulation performance for smart farms with high internal heat generation.

서울시 보육교사 역량강화를 위한 재교육 실태 및 개선방안 연구

김송이(Kim, Song Yi),최주혜,이혜숙 서울시 여성가족재단 2014 서울시 여성가족재단 연구사업보고서 Vol.- No.-