Chart와 단일화를 이용한 한국어 분석 기법

권혁철 부산대학교 1989 자연과학논문집 Vol.48 No.-

이 논문은 상대적으로 어순이 자유로운 언어인 한국어의 특성을 반영하면서, 모든 가능한 문장 구조를 분석할 수 있는 한국어 분석 방법을 제시한다. 특히 구절 구조에 의한 통사 표현 기능을 하위 범주화와 단일화에 의해 보완하는 기법을 이용하면서, bottom-up과 left-right에 의해 처리가 가능한 단일과정 (one-path) 분석 기법을 이용하는 것이 본 논문의 특징이다. 그리고 하위 범주화와 서술어의 어미가 가진 양상 정보에 의존하여 한국어의 내포문 처리가 이루어져야함을 보여준다.

단어 간 지배 관계 및 연관 관계를 이용한 한국어 교열 시스템

권혁철 부산대학교 1994 자연과학논문집 Vol.58 No.-

스펠러와 같은 오류 처리 기법은 한 어절 사이의 처리에 국한되거나, 또는 수사 처리와 같이 일부 제한된 품사 영역에서만 어절을 넘어선 처리가 행해지고 있다. 한편 교열과 같은 어절 단위를 넘어선 오류 처리는 완벽한 통사 분석과 의미 해석을 반드시 필요로 한다고 생각되어져 왔다. 그리고 현재 한국어 처리에서는 완벽한 통사적, 의미적 처리가 불가능하기 때문에 교열 시스템 또는 어절 단위를 넘어선 오류 처리에 대한 연구가 거의 전무한 실정이다. 본 논문은 어절을 넘어선 오류의 유형을 분류하고, 문장 단위로 관련된 단어 사용 오류를 검사하는 기법과 관련 단어 처리를 위한 규칙 데이타 베이스의 구조를 제안한다. 단어 사이에 존재하는 통사적, 의미적 지배 관계와 연관 관계를 어휘 선택 제약으로 이용함으로써 완벽한 통사 분석과 의미 분석이 없이도 교열이 가능하게 하였다. Spelling checker can correct simple orthographic and typing errose that can not be accepted by a morphological analyzer and suggests some candidate words. But some errors can not be detected without semantic analysis. However semantic analysis is not feasible for the commercial use until now. Fortunately, the statistics shows that people frequently make same errors due to phonetic or semantic similarities or to wrong knowledge of words. Our Automatic Revision System, can detect large part of semantic errors using pattern matching method without semantic analysis, since people make the same or similar errors repeatedly. This paper shows that collocation and anti-collocation information among words and the data structures of the knowledge base for storing this information can provide use with correction of semantic errors. Our system can cover 40 percents of semantic errors related to co-occurrence, honorific, pleonasm, and registers. The errors which can not be corrected by the system need the syntactic and semantic analysis of a sentence. For the better correction rate of our system, the knowledge base which stores collocation informations must be expanded.

뇌자도 측정을 위한 저잡음 Nb SQUID 센서의 설계 및 제작

이용호,권혁찬,김진목,이상길,임청무,박용기,박종철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We report on the design, fabrication and performances of a low-noise Nb SQUID sensor for neuromagnetic measurements. The main features of the developed sensor are i) large flux-to-voltage transfer, making the SQUID readout electronics simple, and ii) use of the integrated planar pickup coil to eliminate the environmental magnetic field noises. The magnetic field noise of the developed SQUID sensor is below 5 fT/√Hz at 100 Hz, which is low enough to be used in neuromagnetic measurements.

브로콜리 추출물의 향장활성 효과

김대용ㆍ조석철ㆍ권혁선ㆍ김미경(Dae Young KimㆍSeok chul ChoㆍHyuk sun KwonㆍMee Kyung Kim) 한국인체미용예술학회 2016 한국인체미용예술학회지 Vol.17 No.1

In this study, we investigated the anti-oxidative effects, antimicrobial, and anti-inflammatory activities of the extracts from broccoli to evaluate its use as a functional ingredient in cosmetics. The extracts are WE (water extract at RT), MWE (mineral water extract at RT), EE (70% ethanol extract at RT), and USEE (heat process for 12 hours at 60℃ after ultrasonification for six hours with 70% ethanol). The measurements of the total polyphenol content from broccoli extracts were highest in EE at 425.24±13.9 mg/g dry. The result of electron donating ability of EE was the highest at 10,000 ㎍/㎖ as 97.81% and increased in a concentration-dependent manner. The ferric reducing antioxidant powder (FRAP) of EE was the highest at 10,000 ㎍/㎖ as 1235.6 μM. In an antimicrobial activity test, the EE showed significant antimicrobial activity against S. epidermidis, S. aureus, E. coli, P. acnes, and P. ovale. Furthermore, broccoli extract exhibited no cytotoxicity in RAW 264.7 cells. Also anti- inflammatory activity by NO assay showed LPS-induced NO was significantly inhibited following treatment with EE of 1,000 ㎍/㎖. Therefore, the broccoli ethanol extract can be used as a resource of natural cosmetic material for functional cosmetics.

Si Bulk Micromachining을 위한 Wafer Rolling Etching 및 그 특성

김건년,이보나,박효덕,신상모,공경준,장동근,김병철,권혁채,이봉희 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

A wafer rolling etching system for the silicon bulk micromachining has been designed and fabricated. The silicon diaphragms were anisotropically etched in a 24.5 weight percent KOH solution. Compared to the conventional KOH etching systems, pyramidal hillocks, and wave-shaped structures on the etched surfaces were greatly reduced by using this system. After etching for time of 438 minutes, the average etched depth and the etch-rate were measured to be 537μm and 1.22μm/min, respectively. The average etching uniformity of etching depth was 0.87% in 5-inch wafer. Our results showed that the wafer rolling method enhanced etch uniformity and etch rate.

Enhanced Selectivity for CO₂ Adsorption on Mesoporous Silica with Alkali Metal Halide Due to Electrostatic Field: A Molecular Simulation Approach

Kwon, Soonchul,Kwon, Hyuk Jae,Choi, Ji Il,Kim, Ki Chul,Seo, Jeong Gil,Park, Jung Eun,You, Su Jin,Park, Eun Duck,Jang, Seung Soon,Lee, Hyun Chul American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.37

<P>Since adsorption performances are dominantly determined by adsorbate adsorbent interactions, accurate theoretical prediction of the thermodynamic characteristics of gas adsorption is critical for designing new sorbent materials as well as understanding the sic), adsorption mechanisms. Here, through our molecular modeling approach using a newly developed quantum-mechanics-based force field, it is demonstrated that the CO2 adsorption selectivity of SBA-15 can be enhanced by incorporating crystalline potassium chloride particles. It is noted that the induced intensive electrostatic fields around potassium chloride clusters create gas-trapping sites with high selectivity for CO2 adsorption. The newly developed force field can provide a reliable theoretical tool for accurately evaluating the gas adsorption on given adsorbents, which can be utilized to identify good gas adsorbents.</P>

Predictive Guide for Collective CO₂ Adsorption Properties of Mg−Al Mixed Oxides

Kwon, Hyuk Jae,Kwon, Soonchul,Seo, Jeong Gil,Jung, In Sun,Son, You-Hwan,Lee, Chan Hyun,Lee, Ki Bong,Lee, Hyun Chul Wiley (John WileySons) 2017 CHEM SUS CHEM Vol.10 No.8

<P>Although solid adsorption processes offer attractive benefits, such as reduced energy demands and penalties compared with liquid absorption processes, there are still pressing needs for solid adsorbents with high adsorption capacities, thermal efficiencies, and energy-intensive regeneration in gas-treatment processes. The CO2 adsorption capacities of layered double oxides (LDOs), which are attractive solid adsorbents, have an asymmetric volcano-type correlation with their relative crystallinities. Furthermore, new collective adsorption properties (adsorption capacity, adsorptive energy and charge-transfer amount based on the adsorbent weight) are proposed based on density functional theory (DFT) calculations and measured surface areas. The correlation of these collective properties with their crystallinities is in good agreement with the experimentally measured CO2 adsorptive capacity trend, providing a predictive guide for the development of solid adsorbents for gas-adsorption processes.</P>

지역화폐 기획과 운영 간 상호 조응성에 관한 연구: 지역사랑상품권 운영 사례를 중심으로

권혁철(Kwon, Hyuk Chul) 동국대학교 사회과학연구원 2020 사회과학연구 Vol.27 No.3

지역화폐(지역사랑상품권)가 침체된 지역 경제를 활성화 시킬 수 있는 대안으로 주목받으면서 최근 지역화폐를 발행하는 지자체가 급증하고 있다. 그렇다면 지역화폐를 지역주민이 과연 얼마나 받아들이고 사용할까라는 문제의식에 기반을 두고 운영 실태 및 효과성에 대한 심층적인 실증의 필요성이 제기된다. 이를 위해 본 연구는 지역화폐 발행 지자체 및 민간단체 실무자 13명에 대한 심층면접을 통해 기획과 운영 간 상호 조응성을 살펴봄으로써 지역화폐 활용 가능성을 탐색하였다. 그 결과, 지역화폐 도입과 운영 과정, 운영 현장에서 작동되는 지역화폐 정책의 일련의 과정은 상호 조응이 있는 것으로 판단된다. 하지만 실제로 얼마나 발행 목적이 실현되고 있는가에 대한 판단은 섣불리 내릴 수가 없다. 지역화폐의 현주소가 도입 초기 단계로써 지역화폐의 대중성 확보가 우선시 되고 있기 때문이다. 또한 지역화폐가 지역주민들에게 기대 이상의 호응을 얻고 발행액이 증가하고 있지만, 지역화폐 도입 목적과 지역화폐가 추구해야할 가치가 불분명하다보니 지자체의 발행지속성에 대한 고민이 가중되고 있었다. 본 연구는 지역화폐를 발행하는 실무자의 목소리로부터 지역화폐 도입 및 운영 과정을 구체적으로 확인하는 연구로 의의가 있으며, 연구결과를 근거로 지역화폐 정책 목표 및 운영 방향에 대한 제도적, 실천적 함의를 제안한다. The number of local governments issuing local currency has been on the rise recently as local currency (regional gift certificate) has been seen as an alternative to invigorate the sluggish local economy. For local currency to be successful, careful analysis of the conditions for the introduction pre-determination is required. This study explored the prerequisites and availability of the introduction through in-depth interviews with 13 working-level officials of local governments and private organizations issuing local currency. As a result, the introduction and operation process of local currency and the series of regional currency policies that operate at the operation site are judged to have interaction correspondence. However, it is impossible to make a hasty judgment on how much the purpose of the issue has actually been realized. This is because the current status of local currency is the initial stage of introduction, and securing the popularity of local currency is a priority. Although local currency received more than expected responses from local residents and the amount of issuance was increasing, the purpose of introducing local currency and the value of local currency being pursued were unclear, raising concerns over the local government"s continuity of issue. This study is meaningful as it specifically identifies the process of introducing and operating regional currency from the voice of the person in charge of issuing regional currency, and proposed institutional and practical implications for regional monetary policy objectives and direction of operation based on the research results.

북한의 최종상태 핵 위협 평가와 한국의 군사대비태세 보완

권혁철(Kwon, Hyuk-chul) 한국군사문제연구원 2017 한국군사 Vol.1 No.-

북한의 핵 개발이 현재 추세대로 계속된다면, 머지않아 우리는 북한의 최종상태 핵 위협에 직면하게 될 것이다. 본 연구는 이러한 북한의 최종상태 핵 위협에 대비한 우리 군의 군사대비태세를 진단하여 그 취약성을 보완하는데 연구의 목적을 두었다. 이를 위해 먼저 북한핵 위협에 대한 한국군의 양대 대비책인 3축 전략과 한미 맞춤형 억제전략을 집중적으로 분석하여 그 취약성을 도출하였다. 그 결과 3축은 전반적으로 취약성이 많았고, 한미 맞춤형 억제전략은 상대적으로 취약성이 적었으나 미국의 핵우산 제공에 대한 신뢰성, 선제타격의 실행력, 핵미사일 방어능력 등에서 적지 않는 취약성이 발견되었다. 이러한 결과를 토대로 최소한의 핵개발 인프라를 구축, 상황과 조건에 기초한 미 핵우산 전력의 단계별 배치, 선제타격의 실행력 향상, 제2의 KAMD 구축, 한미 간 마찰 해소 방안, 한국형 핵 억제전략(KNDS) 등을 취약성을 보완할 수 있는 대안으로 제시하였다. If North Korea continues to develop its nuclear program in current trend, we will face the end-state of North Korea’s nuclear threat. The purpose of this study is to analyse the ROK military’s readiness posture for the end-state of North Korea’s nuclear threat and identify weak points to make up them. To that end, the study focuses on the analysis of 3K (Kill Chain, KAMD, and KMPR) and Tailored Deterrence Strategy (TDS) which are considered to be the two pillars of the ROK’s defense system against the North Korea thereat. The study concludes that 3K has an overall weakness when considered from different perspectives. Although TDS presents relatively less weakness than 3K, there are still remained doubts about the reliability of U.S. unclear umbrella, the executive ability of preemptive strikes, and the defense capability for nuclear missile. Based on these findings, this study recommends that we need to supplement the identified areas of weakness, such as the establishment of nuclear program infrastructure, the phased-deployment of U.S. nuclear umbrellas based on circumstances and conditions, the improvement of executive power of preemptive strikes, the establishment of the second KAMD, the methods to settle any discord between ROK and U.S., and Korean Nuclear Deterrence Strategy (KNDS).

한국적 환경을 반영한 사용자 인터페이스 구현의 가능성

권혁철(Hyuk-Chul Kwon) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.1995 No.2