황석영의 제자 김한수가 쓴 ' 황석영 석방이유서 ' : 황석영을 가두지 말고 우리의 미래를 가두라

김한수 사회평론 1996 사회평론 길 Vol.96 No.11

동중국해와 기니만에서 저염분수로 인한 표층음파채널과 중주파수 음향 특성 분석

김한수,김주호,팽동국,Kim, Hansoo,Kim, Juho,Paeng, Dong-Guk 한국음향학회 2015 韓國音響學會誌 Vol.34 No.1

양쯔강이나 나이저강과 같은 큰 강의 하구를 통해서 많은 담수가 흘러 들어오는 연안에서는 표층염분이 급격히 낮아져서 음속 변화에 영향을 끼친다. 본 논문에서는 우기의 동중국해 해역과 기니만에서 저염분수로 인해 생성되는 표층음파채널(SSC) 현상을 분석하였다. 동중국해는 KODC(Korea Oceanographic Data Center)의 자료를, 적도 부근의 기니만은 ARGO(Array for Real-time Geostrophic Oceanography) 자료를 사용하였다. 수집된 자료를 토대로 표층음파채널 발생동향을 살펴본 결과 동중국해에서는 10년 동안(2000 ~ 2009) 9개 정점에서 측정된 90회 자료중 표층음파채널은 32회 나타났고 그 중 염분채널은 14회 나타난 반면 기니만에서는 3년 동안(2006 ~ 2009) 20개 정점에서 측정된 20회 자료 중 모든 경우에서 표층음파채널이 발생하였으며 염분채널은 18회 나타났다. 음속구배에 영향을 주는 수온-염분의 기울기를 분석한 결과 동중국해에서는 염분과 수온 변화량 모두 크게 나타나 염분, 수온의 조합에 의한 표층음파채널이 형성되었다. 반면 기니만에서는 혼합층이 잘 발달하여 수온 변화가 적고 염분 변화량이 크게 나타나 주로 염분에 의한 표층음파채널이 형성되었다. 음향 특성 분석 결과 동중국해 정점은 채널두께가 6.5 m, 임계각은 $1.5^{\circ}$, 표층과 수온약층에서 전달손실 차는 11.5 dB로 나타났고, 기니만 정점은 채널두께가 18 ~ 24 m, 임계각은 $4.0{\sim}5.4^{\circ}$, 전달손실 차이는 21.5 ~ 27.9 dB로 나타났다. 따라서 본 연구는 큰 강의 하구나 강수량이 많은 해역에서 저염분수로 인한 음파전달 변화를 이해하기 위한 기초 자료로 활용될 수 있을 것으로 판단된다. Salinity affects sound speed in the low salinity environment, in the seas where freshwater from large rivers and flows into the marginal sea area near the Yangtze River and the Niger River. In this paper, SSC (Surface Sound Channel) formed by low salinity water was investigated in the East China Sea and the Gulf of Guinea of rainy season. The data from KODC (Korea Oceanographic Data Center) in the East China Sea and from ARGO (Array for Real-time Geostrophic Oceanography) in the Gulf of Guinea of the tropical area were used for analysis. SSC haline channel was formed 14 times among 32 SSC occurrences when the 90 data from 9 points were analyzed during a decade (2000 ~ 2009) in the East China Sea. In the Gulf of Guinea, haline channel was formed 18 times among 20 SSC occurrences during 3 years (2006 ~ 2009). When the sound speed gradient was analyzed from temperature-salinity gradient diagram, the gradients of both salinity and temperature affect SSC formation in the East China Sea. In contrast, the salinity gradient mostly affects SSC formation due to the least change of temperature in the well-developed mixed layer in the Gulf of Guinea. Their acoustic characteristics show that channel depth is 6.5 m, critical angle is $1.5^{\circ}$ and difference of transmission loss between surface and thermocline is 11.5 dB in the East China Sea, while channel depth is 18 ~ 24 m, critical angle is $4.0{\sim}5.4^{\circ}$ and difference of transmission loss is 21.5 ~ 27.9 dB in the Gulf of Guinea. These results are expected to be used as a basic understanding of the acoustic transmission changes due to low salinity water at the estuaries and the ocean with heavy precipitation.

수도권 화물자동차 통행분포를 위한 도착지선택모형: 집계중력모형과 실증비교

김한수,박동주,김찬성,이강대,김경수 국토연구원 2010 국토연구 Vol.64 No.-

This research proposed destination choice model of truck compared with gravity model for Seoul Metropolitan, Korea. The modeling approach is a discrete choice model based on the random utility maximizing principles. The research estimated destination choice models for two types : linear utility and non-linear utility models. The structure of destination choice model in the analysis takes the form of a non-linear-in-parameters multinomial logit model to accommodate multiple size measures characterizing the number of elemental alternatives within each alternative zone. The sample used in the analysis was drawn from the 2005 Korea commodity flow survey. The models were evaluated for average trip length, trip length frequency distribution. 도착지선택모형은 다항로짓모형을 이용한 비집계모형으로 개별적인 통행 의사결정자가 여러 대안 중 도착지를 선택하는 행태적 특성을 반영하여 모형화한 것이다. 이 모형은 유연한 확장, 모형해석과 적용이 용이한 장점으로 인해 집계중력모형을 대체할 수 있는 방법론으로 주목을 받고 있다. 본 연구는 화물자동차의 통행분포를 위한 도착지선택모형을 구축하고 집계중력모형과의 비교를 통해 모형예측력과 한계를 파악하는 것이 목적이다. 도착지선택모형은 통행거리, 종사자수, 산업단지 여부로 구성된 효용함수를 이용하여 구축하였다. 특히, 제조업 종사자수와 도소매업 종사자수의 공간적 분포가 다른 것에 착안하여 종사자수를 구분한 모형과 구분하지 않은 모형으로 구축하여 이들의 영향을 분석하였다. 분석결과 소형과 중소형 화물자동차는 도소매업 종사자수 보다 제조업 종사자수의 영향이 더 큰 것을 파악하였으며, 중형과 대형 화물자동차는 도소매업 종사자수에 대한 계수가 유의하지 않으며, 제조업 종사자수로만 추정하는 것이 효과적임을 파악하였다. 집계중력모형과의 비교는 평균통행거리와 통행거리분포의 일치비율을 이용하였다. 그 결과 평균통행거리에서는 도착지선택모형, 일치비율에서는 중력모형이 관측치에 근접하는 것으로 나타났으나, 어느 한 모형의 예측력이 월등히 뛰어나거나 떨어지는 결과를 제시하지는 않았다. 이는 도착지선택모형이 집계중력모형과 동등한 수준의 현실설명력을 나타내는 것이라 할 수 있다. 향후 연구로는 개별대안과 집계대안과의 관계를 반영하는 방법, 비선택대안의 표본추출 시 단순무작위 추출보다 층화추출을 하는 방법 등이 필요하다.

음도 고정 시 강도 변화에 따른 일반인과 성악인 발성의 성대접촉률 변화 특성의 비교

김한수,전용선,정성민,조근경,박은희,Kim, Han-Su,Jeon, Yong-Sun,Chung, Sung-Min,Cho, Kun-Kyung,Park, Eun-Hee 대한후두음성언어의학회 2005 대한후두음성언어의학회지 Vol.16 No.1

Background and Objectives : The most important two factors of the voice production are the respiratory function which is the power source of voice and the glottic closure that transform the air flow into sound signals. The purpose of this study was to investigate the differences between trained singers and untrained controls under varying intensity at a constant vocal pitch by simulataneous using the airway interruption method and electroglottography(EGG). Materials and Methods : Under two different intensity condition at a constant vocal pitch(/G/), 20(Male 10, Female 10) trained singers were studied. Mean flow rate(MFR), subglottic pressure(Psub) and intensity were measured with aerodynamic test using the Phonatory function analyzer. Closed quotients(CQ), jitter and shimmer were also investigated by electroglottography using Lx speech studio. These data were compared with that of normal controls. Results : MFR and Psub were increased on high intensity condition in all subject groups but there was no statistically significance. Statistically significant increasing of CQ. were observed in male trained singers on high intensity condition (untrained male : 51.31${\pm}$3.70%, trained male :55.52${\pm}$6.07%, p=.039). Shimmer percent, one of the phonatory stability parameters, was also decreased statistically in all subject groups(p<.001). Conclusion : The trained singers' phonation was more efficient than untrained singers. The result means that the trained singers can increase the loudness with little changing of mean flow rate, subglottic pressure but more increasing of glottic closed quotients.

동시 과제 수행에 따른 운전 중 돌발 상황 시 차량 통제 정도 비교 : 50대 운전자를 대상으로

김한수,최진승,강동원,연홍원,최미현,지두환,민병찬,정순철,탁계래 한국산업경영시스템학회 2011 한국산업경영시스템학회 학술대회 Vol.2011 No.춘계

The purpose of this study was to quantitatively evaluate the effects of the secondary task with unexpected situation during simulated driving using the variable indicating control of vehicle. The subjects were participated 50s people including 15 males with 29.5±6.7 years of driving experiences and 15 females with 20.1±5.6 years of driving experiences. All subjects were instructed to keep a certain distance (30m) from the car ahead and a constant speed (80km/hr or 100km/hr). Sending text message(STM) and Searching navigation(SN) were selected as the secondary task. Experiment consisted of driving alone for 1 minute and driving with secondary task for 1 minute. It was defined driving phase and unexpected situation phase respectively. Medial-lateral coefficient of variation(MLCV) of car movement was analyzed for evaluating lane keeping in this study. In the results, MLCV was increased by 118.3% at 100km/hr. In the case of secondary task, MLCV in STN and in SN were increased by 235.1% and 290.3%, respectively. There was no significant difference between male and female. In case of driving at high-speed and with secondary task, it may be disturbed constant control of the vehicle when unexpected situation appeared suddenly.

외래치료실에서의 근위축성 측삭경화증 환자(ALS)의 전신마취 하치과 치료시 마취관리

김한수,이숙영,최은혜,김승오,Kim, Han-Su,Lee, Suk-Yung,Choi, Eun-Hye,Kim, Seung-Oh 대한치과마취과학회 2013 Journal of Dental Anesthesia and Pain Medicine Vol.13 No.4

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease caused by the degeneration of upper and lower motor neurons. The disorder causes muscle weakness and atrophy in airway muscles including pharyngeal, laryngeal and other respiratory muscles. The response to muscle realxant is also altered in patients with ALS. Because of the inherent muscle weakness and associated respiratory insufficiency, particular attentions are needed in anesthetic management of ALS patients. We used proper doses of inhalation anesthetics and opioids under EEG-entropy (electroencephalography-entropy)-monitoring without the use of muscle realxants in the anesthetic management of a patient with ALS. The patient early recovered and was discharged on the same day without any respiratory complications.

대구시 도심 주거환경 만족도에 관한 연구

김한수,송흥수,Kim, Han-Su,Song, Heung-Soo 한국주거학회 2008 한국주거학회 논문집 Vol.19 No.4

Based upon the research and analysis on the downtown residents' satisfaction with their current housing areas and preference for future housing areas, this study clarifies the following. First, the breakdown on various factors influencing the housing environment indicates that downtown residents are the most satisfied with the easy access to the public transportation, and cultural and commercial facilities. Second, they are not content with the amenity aspects such as the air, noise, and the surrounding views, and the economic aspects such as the prices of the houses and the prospects for future investment. The low satisfaction suggests that the amenity aspects and economic aspects should be considered for future downtown housing development. Third, more than half of the residents in downtown areas still prefer to dwell in downtown areas. In the future downtown development, the close analysis on the characteristics of downtown dwelling, and the researches on the right direction of downtown housing development for the whole citizens of Daegu should be done in advance. Last, the majority of people wishing to reside in downtown want medium- or large-scale apartment complexes. In the future downtown housing development, it should be focused on the downtown residence with complex functions rather than on the small-scale maintenance projects.

Eco-Friendly Nanocellulose Embedded Polymer Composite Foam for Flame Retardancy Improvement

김한수,박주혁,민경서,윤재륜,송영석 한국고분자학회 2020 Macromolecular Research Vol.28 No.2

Delaying flame propagation in the event of a fire can increase the likelihood of preserving life and alleviating property damage. Here, a strategy for flame retardant polymer composite foam is proposed, which enables the improved performance, good formability, and reduced environmental burden while burning. The strategy is to incorporate sylilated nanocellulose into a polyurethane matrix containing a conventional flame retardant, Tris(2-chloroethyl) phosphate (TCEP). This strategy leads to the generation of char layer faster during combustion, resulting in a delayed flame propagation. The limiting oxygen index (LOI) of the samples increased by 28%, and the production rate of toxic gas emission was considerably reduced. The chemical, thermal, mechanical, and morphological analyses were carried out to understand the underlying physics.

발표148 : 첨가원소와 열 이력에 따른 강 중 개재물 석출 거동의 변화

김한수,박노창,이해건 대한금속재료학회 ( 구 대한금속학회 ) 1999 대한금속학회 추계학술대회 개요집 Vol.1999 No.-

멀티캐스트 프로토콜의 설계에 관한 연구 ( Design of a Multicast Protocol )

김한수,이관휘,이종근 한국통신학회 1994 한국통신학회 학술대회논문집 Vol.13 No.1