디지털 컨버전스에서의 인터럽션: 멀티 모달리티와 멀티 태스킹 간의 상호 관계를 중심으로

이기호,정승기,김혜진,이인성,김진우,Lee, Ki-Ho,Jung, Seung-Ki,Kim, Hye-Jin,Lee, In-Seong,Kim, Jin-Woo 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.3

Digital convergence, defined as the creative fusion of once-independent technologies and service, is getting more attention recently. Interruptions among internal functions happen frequently in digital convergence products because many functions that were in separate products are merged into a single product. Multi-tasking and multi-modality are two distinctive features of interruption in digital convergence products, but their impacts to the user have not been investigated yet. This study conducted a controlled experiment to investigate the impacts of multi-tasking and multi-modality on the subjective satisfaction and objective performance of digital convergent products. The study results indicate that multi-tasking and multi-modality have substantial effects individually as well as together. The paper ends with practical and theoretical implications of study results as well as research limits and future research.

K⁺ 통로 조절 약물이 마우스 골격근의 피로현상에 미치는 영향

이기호,류판동,이문한,이항,Lee, Ki-ho,Ryu, Pan-dong,Lee, Mun-han,Lee, Hang 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.2

The density of ATP-sensitive potassium($K_{APT}$) channels, that open as intracellular ATP concentration falls below a critical level, is very high in skeletal muscle surface membrane and those high density may imply that $K_{ATP}$ channels have very important physiological roles. To elucidate a role of $K_{ATP}$ in relation to fatigue, the modulating effects of potassium channel openers and blockers on the fatigue velocity(FV) of mouse extensor hallucis longus muscle(EHL) were investigated in vitro. Twitch contraction was induced by an electrical field stimulation (EFS: 24-48V, 20ms, 0.2-4Hz) and resulting contraction force was isometrically recorded. The twitch forces were gradually decreased to 25% of initial contraction force(ICF) in $37.52{\pm}1.55sec$($mean{\pm}s.e.m.$, n=135), indicating the fatigue phenomena. The mean velocity for development of the fatigue was measured during the period that twitch force decreased to half($FV_{0/0.5}$) and during the period from half to 25%($FV_{0.5/0.25}$) of ICF. The fatigue was induced once every one hour and the tissue response was stable for up to 4 hours. In control condition, ICF was $5.8{\pm}0.12g$ (n=144) and decreased to 50% of ICF with the mean fatigue velocity of $0.182{\pm}0.006g/sec$($FV_{0/0.5}$, n=135) and from 50% to 25% of ICF with $0.084{\pm}0.004g/sec$($FV_{0.5/0.25}$, n=135). Cromakalim($50{\mu}M$) significantly increased $FV_{0.5/0.25}$(n=4). Glibenclamide($IC_{50}>50{\mu}M$), $Ba^{2+}$($IC_{50}=10{\mu}M$), 4-aminopyridine($FV_{0/0.5}$, $IC_{50}=0.5mM$; $FV_{0.5/0.25}$, $IC_{50}=2mM$) decreased both $FV_{0/0.5}$ and $FV_{0.5/0.25}$ concentration-dependently up to 75%. $TEA^+$(30mM), E-4031($10{\mu}M$), tolbutamide(1mM) decreased $FV_{0.5/0.25}$, but apamin(300nM) and $TEA^+$(10mM) showed no significant effects. Our results suggest that activation of the $K_{ATP}$ channels may be major cause of $K^+$ outflux during development of the fatigue and the isolated EHL muscle could be an useful experimental preparation in studying the fatigue phenomena in skeletal muscle. In addition, the possibility of activation of delayed rectifier during the fatigue development remains to be studied further.

Application of Synchrotron Radiaton to Semiconductor Process and Surface Photochemical Reaction

이기호,김병엽,이시우,Lee, Ki-Ho,Kim, Byoung-Youp,Rhee, Shi-Woo 한국진공학회 1995 Applied Science and Convergence Technology Vol.4 No.s1

제주시 도로변에서의 에어로졸의 입경별 분포 특성

이기호,김수미,허철구,Lee, Ki-Ho,Kim, Su-Mi,Hu, Chul-Goo 한국환경과학회 2021 한국환경과학회지 Vol.30 No.9

Measurements on mass size distribution of roadside aerosols were obtained in downtown Jeju City from July 2018 to May 2020 using an 8-stage cascade impactor sampler and the compositions of aerosols were analyzed. The mass size distribution of total aerosols was bimodal with aerosols existing in both the fine and coarse modes. The mass size distributions of Na⁺, Mg²⁺, Ca²⁺, Cl^-, NH₄⁺ and SO₄^2- were unimodal, whereas that of K⁺ was bimodal. For NO₃^-, the size distribution in winter and spring was bimodal with the peaks in both fine and coarse modes, whereas for summer and autumn the distribution was unimodal with a peak in the coarse mode. NH₄⁺ was found to co-exist with SO₄^2- in the fine mode with an average molar ratio of [NH₄⁺]/[SO₄^2-] equal to 2.05. Good correlation was observed between NO₃^- and NH₄⁺ in the fine mode particles in spring and winter. Based on the value of the marine enrichment factor for Cl^-, Mg²⁺, K⁺, Ca²⁺ and SO₄^2-, it may be inferred that a major part of the roadside aerosols in downtown Jeju City was largely contributed by terrigenous sources, although the influence of sea salt was normally present.

제주시 지역 미세먼지의 변동과 화학적 구성 특성

이기호,김수미,김길성,허철구,Lee, Ki-Ho,Kim, Su-Mi,Kim, Kil-Seong,Hu, Chul-Goo 한국환경과학회 2020 한국환경과학회지 Vol.29 No.5

This study investigated the nitrate formation process, and mass closure of Particulate Matter (PM) were calculated over the urbanized area of Jeju Island. The data for eight water-soluble inorganic ions and nineteen elements in PM_2.5 and PM₁₀ were used. The results show that the nitrate concentration increased as excess ammonium increased in ammonium-rich samples. Furthermore, nitrate formation was not as important in ammonium-poor samples as it was in previous studies. According to the sum of the measured species, approximately 45~53% of gravimetric mass of PM remained unidentified. To calculate the mass closure for both PM_2.5 and PM₁₀, PM chemical components were categorized into secondary inorganic aerosol, crustal matter, sea salt, trace matter and unidentified matter. The results by the mass reconstruction of PM components show that the portion of unidentified matter was decreased from 52.7% to 44.0% in PM_2.5 and from 45.1% to 29.1% in PM₁₀, despite the exclusion of organic matter and elemental carbon.

Clinical Efficacy of Latex Cover for Dental Handpiece

이기호,백동헌,Lee, Ki-Ho,Paek, Dong-Heon Korean Academy of Orofacial Pain and Oral Medicine 2009 Journal of Oral Medicine and Pain Vol.34 No.3

The purpose of this study was to investigate the clinical efficacy of latex cover developed for dental handpiece on contamination of microorganisms during dental treatment and to determine whether it can be an alternative to conventional sterilization such as autoclaving. E. fecaelis was used as a experimental microorganism instead of oral flora. Experimental bowl with 2 cm of rectangular cavity was fabricated for handpiece operating instead of oral cavity. Latex covers ($Orokeeper^{(R)}$, Orobiotech Co., Korea) and several handpieces were used after sterilization by autoclave. Four experiments were performed to evaluate bacterial contamination related with (1) various parts of dental handpiece, (2) swabbing time with alcohol sponge, (3) postoperative air-water spraying time and (4) consecutive use of latex covers without autoclaving. The results show that face of handpiece uncovered with latex cover was severely contaminated than the covered area and that most bacteria were removed by swabbing face and head area of dental hand-piece and by air-water spraying more than 15 seconds nearly up to the level of sterilization. Conclusively it can be suggested that use of latex cover for handpiece during dental procedure, swabbing with alcohol sponge is air-water spraying for more than 15 seconds after use of dental handpiece should be very useful and practical for prevention of cross infection and should be an alternative method for the sterilization of dental handpiece under some difficult situations not being able to sterilize a handpiece with autoclave.

ARM7 호환 32 - Bit RISC Microprocessor 설계

이기호(Ki-Ho Lee),유영재(Young-Jae Yoo),김기민(Ki-Min Kim),강용호(Yong-Ho Kang),송호준(Ho-Jun Song),이철훈(Cheol-Hoon Lee) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ

본 논문에서는 RISC Microprocessor Core 설계에 대한 기반 기술을 확립하며, GPS(Global Positioning System)같은 Embedded 시스템 등에서 주로 사용되어 지고 있는 ARM사의 ARM7 CPU와 이진 호환이 가능한 Microprocessor를 설계하고자 하였다. 이를 위하여 RISC Microprocessor의 기본적인 구조를 바탕으로 하여 ARM7 CPU와의 호환을 위해서 ARM7 CPU 의 명령어들이 주어진 Clock안에 수행될 수 있도록 설계를 하였고, 여러 모듈들을 원활히 공유할 수 있도록 내부에 공유 버스를 설계하였다. 설계를 위해서 Verilog-HDL(Hardware Description Language)을 사용하였으며, Microprocessor를 기술하는데 있어서 Behavioral 구조와 RTL(Register Transfer Level) 구조를 혼합하여 사용하였다. 설계된 Microprocessor의 동작은 면적과 타이밍의 최적화를 거친 후 Cwaves 툴을 사용하여 실직적인 ARM7의 명령어들을 수행하면서 검증하였다.

전문가 프로그램과 학습자 프로그램간의 유사성 검사를 통한 학습자 평가

이기호(Ki-Ho Lee),이정원(Jung-Won Lee) 한국정보과학회 1995 정보과학회논문지(B) Vol.22 No.11

The goal of this thesis is to evaluate student's ability of programming in quality by checking the similarity between an expert program and programs of a student program to solve the same problem. We partition programs of an expert and a student into statements, basic elements of program, and construct automatic rule generator and automatic fact generator, which are able to inference the program similarity with CLIPS(Rule-based language) automatically. The generated rules are the requirements of a programming problem, and by using them we have implemented a system for inferencing the similarity between two programs with control structures, types of statements, expressions, variables, and constants. The result of the program similarity is an evaluation how much student program satisfies the requirements of a programming problem. By classifying levels of students according to it more correctly, we can provide a basis to establish an additional tutoring strategy. 본 연구의 목적은 C 프로그래밍 교육 시스템에서 같은 문제를 해결하려는 전문가 프로그램과 학습자 프로그램간의 유사성을 다단계로 검사하여, 학습자의 프로그램 작성 능력을 질적으로 평가하는데 있다. 전문가 프로그램과 학습자 프로그램 문장을 기본단위로 분할하고, 분할된 요소들을 규칙-기반 언어(Rule based language)인 CLIPS를 이용하여 추론할 수 있도록 자동 규칙 생성기(Automatic rule generator)와 자동 사실 생성기(Automatic fact generator)를 구축하였다. 생성된 규칙이 프로그램 문제의 요구사항이 되어 제어구조, 문장의 형태, 수식, 변수와 지정 상수값에 대한 두 프로그램의 유사성을 추론하는 시스템을 구현하였다. 유사성 결과는 학습자 프로그램이 문제가 요구하는 처리사항을 모두 만족하며 효율적으로 작성되었는지에 대한 평가로써 좀 더 정확한 학습자의 수준을 분류하여 부가적인 교수 전략을 수립하는데 기초를 마련할 수 있다.

동래야류의 무대적 수용에 의한 연극 콘텐츠 창출

이기호(Ki-Ho Lee) 한국콘텐츠학회 2011 한국콘텐츠학회논문지 Vol.11 No.1

본 연구는 전통연희에 대한 공연인류학적 접근을 통하여 새로운 연극 콘텐츠 창출 가능성을 고찰하는데 그 목적이 있다. 오늘날 전승되고 있는 전통연희는 역사적으로 악ㆍ희ㆍ극의 갈래로 변천, 발전되어 온 전통공연예술이다. 그 중에서도 중요무형문화재 제18호인 동래야류는 부산시 동래 지역에서 전승되어 오는 전통 탈놀음으로 악ㆍ희ㆍ극의 공연특성이 통합된 형태로 연희되고 있다. 21세기의 한국연극은 포스터 모더니즘 문화현상을 거친 후 다시 리얼리즘으로 회귀하고 있는 것으로 보인다. 그런 반면 대안연극에 대한 관심도 더욱 고조되고 있다. 따라서 본고에서는 그 대안으로 새로운 연극형식 창조의 영감을 전통연희의 공연성에서 탐색하고자 한다. 전통연희 중에서도 전통공연미학인 악ㆍ희ㆍ극의 특징이 잘 조화되어 전승되고 있는 동래야류로부터 원초적인 공연성의 본질과 원리를 밝혀내어 새로운 연극형식 및 연극 텍스트를 창출하는 모티프로 활용하고자 한다. 동래야류에서 나타나고 있는 신명풀이에 바탕을 둔 악ㆍ희ㆍ극의 요소들, 즉 향토적인 음악과 세련된 춤사위, 해학과 풍자와 기지, 양식화되고 약호화된 연극형식의 무대적 수용으로 새로운 연극 콘텐츠의 창출 가능성을 모색하고자 한다. The purpose of this research is to investigate the possibility of creating new theatrical contents by performance anthropological approach. Today's traditional performing arts are historically descended and developed in the forms of Ahk, Hee, and Geuk. Among those, Dongrae-yaru is a traditional mask dance, handed down in Dongrae, Pusan and appointed as the 18th intangible cultural asset. Its performance is carried out in the juxtaposition of Ahk, Hee, and Geuk. Korean theatre in the 21st century seems going back to realism after going through post-modern cultural phenomenons. However, the quest for alternative theatre is raised higher than ever. As a part of this strive, this paper asserts the traditional performing arts should be investigated as an alternative and new theatrical form. Among those traditional performing arts, Dongrae-yaru is selected for its well balanced combination of Ahk, Hee, and Geuk. The study examines in depth how each element of Ahk, Hee, and Geuk, they are expressed in forms of folk music, refined dance, jest, satire, wit. Its investigation on the stage adaptation provides the possibility for the new style and codification as the new theatre contents.

LDPC(Low Density Parity Check)를 결합한 단일 심볼 복호 기반의 준직교 시공간 블록코드

이기호(Ki-Ho Lee),김종득(Jong-Deuk Kim),변윤식(Youn-Shik Byun) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.11