동기관음의 스펙트럼 차이를 이용한 비강 특성 산출: 예비 연구

박한상,Park, Han-Sang 대한음성학회 2005 말소리 Vol.53 No.-

A New Method of Extracting the Filter Characteristics of the Nasal Cavity Using Homorganic Nasal-Stop Sequences: A Preliminary R eportHansang ParkThis study provides a new method of extracting the filter characteristics of the nasal cavity. Korean lenis stops are realized as voiced in the homorganic nasal-lenis stop sequences between vowels. Since the only difference between the two members of the homorganic nasal- lenis stop sequences, such as [mb], [nd], and [ g], is whether the passage to the nasal cavity is open or not, the subtraction of the LPC spectrum of the voiced stop from that of the preceding nasal leads to the filter characteristics of the nasal cavity of an individual speaker regardless of place of articulation. The results suggest that various attempts should be made to extract a robust filter characteristics of the nasal cavity by giving variation to LPC coefficients and by paying particular attention to speech samples. This study is significant in that it provides a preliminary report about a new method of extracting the filter characteristics of the nasal cavity.

한국어 발성 유형의 음향음성학적 연구

박한상,Park, Han-Sang 한국음향학회 2005 韓國音響學會誌 Vol.24 No.6

발성유형지수 k (PTI k)는 F0와 모음 음가의 영향을 배제한, 단순하고 단일화된 스펙트럼 기울기의 척도다. 본 논문은 한국인 20대 남성화자 10명으로부터 얻은 모음 /이, 에, 아, 오, 우/에 나타난 PTI k를 연구한다. 환경, 발성유형, 모음, 그리고 화자를 요인으로 하여 각 집단간에 PTI k의 값에 유의미한 차이가 있는지 알아본다. 연구 결과 환경, 발성유형, 모음, 그리고 화자 각각에 집단간에 유의미한 차이가 있었다. Phonation type index k (PTI In) presents a single and simplified measure of the spectral tilt. which is free from the effects of fundamental frequency and vowel qualify This study investigates PTI k with vowels /i . e. a. o, u/ obtained from 10 Korean male subjects. Specifically. this study tests the significance of differences in PTI k across Positions, Phonation types. vowels, and speakers, respectively The results showed that there was a significant difference in PTI k across positions, Phonation types, vowels. and speakers.

말레이시아어와 인도네시아어 모음 공간의 지형도

박한상,박정숙,전태현,Park Han-Sang,Park Jeong-Sook,Chun Tai-Hyun 대한음성학회 2006 말소리 Vol.58 No.-

The present study investigates the vowels of Bahasa Malaysia and Bahasa Indonesia in terms of the first two formant frequencies and provides a three-dimensional formant chart of vowels by plotting F1, F2, and the frequency of <F1,F2> datapoints on 4 different scales: Hz, mel, bark, and the number of ERB. For this study, we recruited 30 male native speakers of Bahasa Malaysia and Bahasa Indonesia (15 each) which include 6 vowels (i, e, a, o, u, e) in various contexts. The three-dimensional formant chart showed geophysics of vowel space, such that mountain peaks stand in particular locations with a higher frequency of occurrence of datapoints. The geophysics of vowel space may shed lights on the perceptual structure of vowel space. The results also showed that vowels in utterance-final positions have a significantly higher F1 and a significantly lower F2 than those in utterance-medial or utterance-initial positions, which means that vowels in utterance-final positions are more back and lower in vowel space than those in utterance-medial or utterance-initial positions.

한국어 자음군의 후행모음에 나타난 발성유형의 음향음성학적 연구

박한상,Park, Han-Sang 대한음성학회 2007 말소리 Vol.64 No.-

This study investigates phonation types of Korean obstruents associated with the vowels immediately following singletons or geminates in intervocalic positions. F0, H1-H2, and spectral tilt were measured from the 20 ms segment at the onset of the vowels for the tokens of /paCa/ and /paCCa/, where Cs are of the same manner and place of articulation. The results showed a remarkable change in the values of F0, H1-H2, and spectral tilt as the preceding obstruents shifts from the lenis singletons to the lenis geminates, which suggests that the spectral characteristics of the vowels following the lenis geminates are not different from those of the vowels following fortis singletons or geminates. Significantly enough, this study adds data about the spectral characteristics of Korean phonation types.

골수이형성증후군환자에서 발생한 맥락막박리

박한상 ( Han Sang Park ) , 이준훈 ( Jun Hun Lee ) , 김인택 ( In Taek Kim ) 대한안과학회 2004 대한안과학회지 Vol.45 No.12

SNMPGET을 이용한 DDoS 공격 탐지

박한상(Park han-sang),유대성(Yoo dae-sung),오창석(Oh chang-suk) 한국콘텐츠학회 2004 한국콘텐츠학회 종합학술대회 논문집 Vol.2 No.1

최근의 트래픽 폭주 공격은 웜의 확산성과 공격 방법의 발달로 인하여 공격 전개시간이 단축되었다. 하지만 기존의 트래픽 분석 방법에서는 최근의 트래픽 폭주 공격의 빠른 진행을 탐지하기에는 시간의 제약점이 있다. 본 논문에서는 이러한 취약점을 보완하기 위해 트래픽을 수집하고 분석하는데 있어 시간을 향상시킨 트래픽 수집 및 분석 알고리즘을 제안하고 구현하였다. Recently traffic flooding attack has happened faster and faster owing to expansion of the worm attack and development of the method of traffic flooding attack. The method in the past time is problematic in detecting the recent traffic flooding attacks, which are running quickly. Therefore, this paper aims to establish the algorithm which reduces the time of detection to traffic flooding attack in collecting and analyzing traffics.

TiO₂를 이용한 목질보드용 요소수지의 포름알데히드방출 저감을 위한 새로운 제조방법

박한상(Han-Sang Park),이화형(Hwa-Hyoung Lee) 충남대학교 농업과학연구소 2009 농업과학연구 Vol.36 No.1

The purpose of this study is to examine a proper amount of addition and a proper point for addition of titanium dioxide for the manufacture of E0 type of urea-formaldehyde resin (UF). The reduction of free formaldehyde from UF resin treated particle board was also investigated. TiO₂ content was 0.5%, 1% and 3% on the dry basis of UF resin. UV light was used to initiate reaction. The results of this study are as follows: 1. During UF resin manufacturing process, the second adding step of urea was proper point for TiO₂ addition. 2. 1 % addition of TiO₂ gave good values for the Eo type urea-formaldehyde resin. 3. There was no significant difference between physical properties of particle board, but the higher the adding content of titanium dioxide resulted in the lower the mechanical properties.

골수이형성증후군환자에서 발생한 맥락막박리

박한상 ( Han Sang Park ),이준훈 ( Jun Hun Lee ),김인택 ( In Taek Kim ) 대한안과학회 2004 대한안과학회지 Vol.45 No.12

나비모양 망막이상증의 빛간섭단층촬영 소견 1예

김경민,박한상,하승민,유용성,김시열,Kyoung Min Kim,MD,Han Sang Park,MD,Seung Min Ha,MD,Yong Sung You,MD,Si Yeol Kim,MD 대한안과학회 2012 대한안과학회지 Vol.53 No.11

Purpose: The butterfly-shaped pigment dystrophy is an extremely rare autosomal dominant retinal disorder. The authors present a case of butterfly-shaped pigment dsytrophy not reported previously in Korea. Case summary: A 45-year-old man had bilateral blurred vision for 2 years. His visual acuity was 0.2 in the right eye, and 0.3 in the left and was uncorrected. Funduscopically, yellow pigment deposits were present at the level of retinal pigment epithelium (RPE) in the central macula of both eyes. Fluorescein angiography (FA) revealed a central, dark, butterfly- shaped lesion surrounded by a region of hyperfluorescence, Spectral domain optical coherence tomography (OCT) showed thick elevation of the RPE with hyperreflectivity and disruption of the inner and outer segment (IS/OS) interface of the photoreceptors. The patient had normal color vision, visual field and electroretinograms and reduced electrooculograms. Conclusions: In general, butterfly-shaped pigment dystrophy is known to have good visual prognosis. However, in some cases the disease can be a chronic progressive disorder with secondary involvement of the photoreceptors, as exemplified this patient. The authors anticipate more detail regarding the natural course of this disease will be obtained through spectral domain OCT.

급성 특발성 맹점확대증후군 소견을 나타내는 급성 대상잠재성 외망막병증

김종호,김명준,박한상,Jong Ho Kim,Myung Jun Kim,Han Sang Park 대한안과학회 2011 대한안과학회지 Vol.52 No.3

Purpose: To present a case of acute zonal occult outer retinopathy (AZOOR) with acute idiopathic blind spot enlargement (AIBSE) investigated using indocyanine green angiography (ICGA), multifocal electroretinography (multifocal ERG) and spectral domain-OCT (SD-OCT). Case summary: A healthy 31-year-old female with photopsia and a five-day visual field defect in her left eye showed no abnormal findings in ocular examinations such as slit lamp and fundus examination, fluorescein angiography (FAG), or full field ERG as well as in the systemic neurologic examination. In the late phase of ICGA, there were multiple hypofluorescent spots around the optic disc and scattered through the posterior pole. The patient showed an amplitude decrease of multifocal ERG and the destruction of the boundary between the inner and outer segments of the photoreceptors in the SD-OCT examined in the retinal area corresponding to the visual field defect. The patient was diagnosed with AZOOR and was followed-up without treatment. After three months, no abnormal SD-OCT or visual field test findings were observed and no symptoms remained; however, a slightly depressed response on multifocal ERG was present. Conclusions: ICGA, multifocal ERG and SD-OCT could be useful methods to detect AZOOR with EBS. J Korean Ophthalmol Soc 2011;52(3):364-372