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김기성,이기성,최영태,김민식 충남대학교 교지편집위원회 2004 寶雲 - 충남대학교 Vol.- No.35

우수한 공간 효율성을 제공하는 순서노출암호 기법

김기성 한국정보보호학회 2019 정보보호학회논문지 Vol.29 No.3

Order-revealing encryption which enables a range query over encrypted data is attracting attention as one of the importantsecurity technologies in industry such as IoT, smart manufacturing, and cloud computing. In 2015, an ideally-secureorder-revealing encryption whose ciphertexts reveal no additional information beyond the order of the underlying plaintextshas been proposed. However, their construction is too inefficient for practical use and some security analysis of multilinearmaps, which their construction relies on, have been proposed. Recently, more practical schemes have been proposed,focusing on achieving practically usable efficiency rather than the ideal security. In this paper, we propose a morestorage-efficient order-revealing encryption scheme than the Lewi et al.'s scheme most recently published by presenting anidea that can generate shorter ciphertexts without any security loss. 순서노출암호(order-revealing encryption)는 암호화된 데이터에서 효율적인 범위 검색(range query)을 가능하게 하는 암호 기술로 IoT(internet of things), 스마트 제조(smart manufacturing), 클라우드 컴퓨팅(cloudcomputing) 등 수집 데이터가 경쟁력으로 직결되는 산업분야에서 중요한 보안 기술 중 하나로 주목받고 있다. 2015년 평문의 순서 정보 이외의 어떠한 추가 정보도 노출하지 않는 “이상적인 안전성(ideal-security)”을 만족하는순서노출암호가 발표되었다. 하지만 구현 가능한 효율성을 제공하지 못하며, 기반을 두고 있는 multilinear maps의안전성을 의심할만한 다양한 연구결과들이 발표되었다. 최근에는 이상적인 안전성을 우선으로 만족하기 보다는 실제사용가능한 수준의 효율성 달성에 초점을 맞춘 보다 현실적인 기법들이 제안되고 있는 추세이다. 이에 본 논문에서는현재 가장 우수하다고 평가 받는 Lewi 등이 제안한 순서노출암호의 효율성을 분석하고, 동일한 안전성 대비 보다 짧은 암호문을 생성할 수 있는 설계 논리를 제시하여, 공간 복잡도 측면에서 보다 우수한 새로운 순서노출암호를 제안하고자 한다.

FDS를 이용한 지하철 객실 화재 시 승강장 제연조건의 적정성 평가

김기성,송동우,이수경 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.5

In the subway, various fires continue to take place across the world. In the Daegu subway accident in 2003, many people were damaged by shortened visibility range caused by toxic gas and smoke. This paper, assuming that a subway fire happens in the Mandeok Station of the subway system in Busan, analyzed different smoke-spreading situations depending on the ventilation situation at its platform (opening of the train doors, operation of ventilation facilities in the tunnel,and working of fire door), using FDS. The calculation proved that it would be more effective to secure evacuation route when the ventilation facilities of the tunnel are not operated, than when they are on. And, it was also found that the case where the doors of the platform to the escape route and only the platform-facing doors of the subway car on fire office are open would be more effective to ventilation than the case where all the doors are open. And, it was found to be important that the fire doors of the platform are working properly. 지하철에서는 전 세계적으로 크고 작은 화재가 지속적으로 발생되고 있다. 대구지하철 화재에서 볼 수 있듯이 독성가스와 연기에 의한 가시거리 감소로 많은 인명피해가 발생하였다. 본 논문에서는 부산 지하철 만덕역에서 열차 화재가 발생할 경우 승강장에서의 제연상황(열차문의 개방, 터널의 제연설비의 가동, 방화문의 작동)에 따라 연기의 전파거동을FDS를 사용하여 분석하였다. 계산 결과 터널부의 제연설비를 가동하였을 경우보다는 가동하지 않았을 경우가 피난로 확보에 효과가 있었다. 또한, 열차문의 개방 형태는 승강장의 대피로 측의 문은 모두 개방하고 화재객차의 선로측 문만을개방하였을 경우가 모두 개방한 경우보다 제연 효율이 증가하는 것을 알 수 있었다. 또한, 승강장의 방화문이 정상적으로 가동하는 것이 중요하다는 것을 알 수 있었다.

현대몽골어와 한국어의 수사(數詞) 대조 연구 ― 현대몽골어의 집합수사, 분배수사, 반복수사, 불분명수사, 어림수사, 지소수사, 분수사를 중심으로 ―

김기성 단국대학교 동양학연구원 2017 東洋學 Vol.66 No.-

In this study I summarized the morphology, composition, its meaning and the function of modern Mongolian numerals(focused on collective, distributive, multiplicative, unclear, approximative, diminutive, fractional numerals) and did contrastive analysis of having relevance to between Korean numerals and Mongolian one based on the study of this. From the investigating some numerals identified in modern Mongolian language and Korean language, its results are roughly summarized as follows. In some numerals seen in modern Mongolian language and Korean language, there are appeared following similarities. 1. For collective numerals, their meanings may be varied depending on where and how each constituent of sentence is cut and read in a certain sentence. 2. For collective numerals, when the numeral of ‘1’ is intended to be expressed as a collective numeric meaning in both modern Mongolian language and Korean language, the both languages use a unique and special word of ‘ганцаар(аа)’ or ‘혼자(alone), 혼자서(by oneself)’, respectively without using a connective postposition like ‘-уул, -үүл’ or ‘-이, -이서’ different from the case of other numerals. 3. For distributive numerals in both languages, the both languages can express the meanings of distributive numerals by repeatedly using basic numerals, so the both language are similar in the methodological aspect expressing the meanings of distributive numerals. 4. For approximate numerals, while the forms of affixes, words and basic numerals forming approximate numerals are different one another in modern Mongolian language and Korean language, but the both languages are relatively similar in the methods forming approximate numerals such as how to connect an affix or a word to a basic numeral or a quantifier following a basic numeral, how to consecutively arrange and synthesize two or three basic numerals. In some numerals in modern Mongolian language and Korean language, there are appeared the following differences. 1. For collective numerals, there is different forms like ‘-이서’ being used at counting the number of people while this form of collective numeral is not separately existed in modern Mongolian. 2. For distributive numerals, while Korean language almost necessarily uses a quantifier (classifier) between a numeral (numeric adjacent) modifying a noun seen in this example of ‘다섯 권(씩)의 책(five books)’-here, ‘다섯’ is a numeral meaning 5, the ‘권’ is a quantifier (classifier) meaning the unit noun of book, and the ‘책’ means a plural noun meaning book-, but in modern Mongolian language, there are a lot of cases not using any quantifier (classifier) seen in the example of ‘таван ном[다섯 (권)의 책]’. 3. For repetitive numerals, while in modern Mongolian language, there are some cases that meanings of repetitive numerals are expressed by connecting numerals with the following verbs with omitting the words such as ‘удаа’와 ‘дахин’, but Korean language can‘t omit a repetitive or multiplicative numeral like ’번‘, ’차례’, ‘번 다시’, ‘배’ (the all words mean -times) to be corresponded with the following verbs. 4. For unclear numerals, while the word of ‘얼마 (how many/much)’ is widely used in asking quantity or amount and the word of ‘몇‘ (how many) is mainly used in asking the quantity in Korean language, but this distinction is not unclear in modern Mongolian. 본 연구에서는 현대몽골어의 수사(數詞) 체계 속에서 ‘집합수사(хам тооны нэр/collective numerals)’, ‘분배수사(түгээл тооны нэр/distributive numerals)’, ‘반복수사(дахих тооны нэр/multiplicative numerals)’, ‘불분명수사(тодорхойгүй тооны нэр/unclear numerals)’, ‘어림수사(тойм тооны нэр/approximative numerals)’, ‘지소수사(хязгаарласан тооны нэр/diminutive numerals)’, ‘분수사(бутархай тооны нэр/fractional numerals)’ 등의 형태 및 구성, 또한 그의 의미, 기능, 용법 등을 정리해 살펴보고, 이후 이를 기준으로 여기에 대응 가능한한국어 수사(數詞) 및 수량사구(數量詞句) 등과 서로 대조해 보았다. 아울러 이러한 대조를 통해 이들이 서로어떠한 유사점과 차이점 등을 갖고 있는지도 살펴보았으며, 양 언어의 학습자들에게 담화, 문맥 등의 상황에서중요하게 나타나는 수사의 올바른 사용법과 이를 위한 기초자료 등을 제시해 보았다.

공항 홍보대사의 홍보 효과성 사례연구 : 인천공항을 중심으로

김기성,김기웅,박성식,강우정,Kim, Ki Sung,Kim, Kee Wong,Park, Sung Sik,Kang, Woo Jung 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.2

Incheon international airport has tried to upgrade its image by hosting lots of international events and inviting celebrities as a honorary ambassador of airport. It is uncomparable to other airports all over the globe for incheon airport to utilize an honorary ambassador to promote airport. The purpose of this paper is to try to find out the PR effect of employing honorary embassador at Incheon airport, which has a positive impact on enhancing the image of Incheon airport. In other words, it should be considered the PR effect of honorary embassador has contributed to upgrading airport image resulting in the commitment of passengers. According to empirical research result, it is proven the attractiveness and trust of honorary embassador has not significantly positive impact on the airport's image. However it is also proven the PR activities of airport authority has a significant impact on the airport's image. Passengers believed the honorary ambassador has a high level of attractiveness and trust but they don't agree causal relationship among attractiveness, trust and airport image. That is, they are not interested in who is the honorary ambassador of airport but in the contents of airport's news article itself. The administrative implication is mentioned in the paper that airport authority should mainly focus on the contents of PR not the figure of the honorary ambassador.

삼축투수시험을 이용한 스마트차수재의 투수성능 분석

김기성,유중조,박정준,신은철,박광석 한국재난정보학회 2019 한국재난정보학회 학술대회 Vol.2019 No.09

본 논문에서는 지중에서 유기오염물질의 확산으로 광범위한 지역의 오염을 초기에 방지하기 위한 방법으로써 유기오염물 질을 선택적으로 흡착 및 팽윤할 수 있는 스마트차수소재를 이용하여 투수성능을 분석하였다. 스마트차수재의 투수계수 측정 은 ASTM D 5884의 기준을 참고하여 제작한 삼축투수시험장치를 이용하였다. 시험결과, 압력수두(75kPa)이상에서 4시간이 내 유기오염물질 접촉 시 차수성능을 발휘하였다.

호텔종사원의 심리적 자본과 직무만족, 조직몰입간의 구조적 관계 : 조직후원인식의 조절효과를 중심으로

김기성,문상정 관광경영학회 2016 관광경영연구 Vol.73 No.-

This study surveyed hotel employees who served for five-star hotels located in Daegu and Busan. The convenience sampling was used for the sampling method, and the questionnaire survey was conducted for about two months from September 2015 to November 2015. 316 questionnaire copies were used for data analysis. Data obtained from the collected questionnaires were subjected to reliability analysis and exploratory factor analysis, using SPSS 20.0, and to covariance structure analysis (SEM: structural equation modeling), using Amos 20.0 And the chi square (χ²) difference test was carried out for testing moderating effects. The results of hypothesis testing were as follows: First, it was found that the psychological capital positively influences job satisfaction, hence the more highly the psychological capital is perceived, the higher the job satisfaction is. Second, it was found that hotel employees' psychological capital positively influences organizational commitment. Lastly, it was found that the effects of hotel employees' psychological capital on job satisfaction and organizational commitment vary with the degree of perceived organizational support, thus confirming the moderating effect of perceived organizational support. This study carries significant theoretical implications in that it used as a moderating variable the perceived organizational support, a variable that the existing studies on hotel employees have hardly ever dealt with in the relationships of psychological capital to job satisfaction or organizational commitment, and that it confirmed the moderating effects of the perceived organizational support.

양성 연부조직종양의 초음파 소견

김기성 대한영상의학회 1994 대한영상의학회지 Vol.30 No.5

실험을 통한 765kv 송전선로에 선하지 건조물 화재영향평가

김기성,송동우,이성경,이수경 한국화재소방학회 2015 한국화재소방학회 학술대회 논문집 Vol.2015 No.추계

북한 식량증산을 위한 남북협력 ; 북한 밭기반 정비 및 경사지 복구 협력방안

김기성 평화문제연구소 1999 統一問題硏究 Vol.11 No.1