안구 표면 온도와 군날개의 비측 호발성과의 관계

김재훈,정재훈,하효신,이헌일,김재찬,Jae Hoon Kim,Jae Hoon Jeong,Hyo Shin Ha,Hyeon Il Lee,Jae Chan Kim,Ph,D 대한안과학회 2008 대한안과학회지 Vol.49 No.5

Purpose: To study the relationship between the distribution of the ocular surface temperature and the nasal predominance in pterygium. Methods: In order to identify the distribution of the ocular surface, the surface temperature was measured at four points on the eyelids and on the bulbar conjunctiva with a non-contact thermometer. The ocular surface temperature in the pterygium patient group was compared with that in a normal control group. The temperature difference at each point on the ocular surface was also examined. Results: In both of the patient and the normal groups, the surface temperature on the eyelid was at its lowest on the temporal lower eyelid, and highest on the nasal upper eyelid. On the bulbar conjunctiva, the surface temperature of the nasal conjunctiva was at its lowest, and at its highest on the upper conjunctiva. The most distinctive temperature difference between the patient and control groups was shown on the nasal and temporal bulbar conjunctivas, and statistically significant (p<0.05). Conclusions: Considering the temperature distribution over the ocular surface, we propose that an intrinsic factor that causes the nasal predominance of pterygium could be the comparatively low local temperature of the nasal bulbar conjunctiva.

생활체육 참여자들의 운동중독에 대한 운동행동 예측분석

김재훈 ( Jae Hoon Kim ),이재형 ( Jae Hyoung Lee ) 한국스포츠심리학회 2008 한국스포츠심리학회지 Vol.19 No.3

본 연구는 625명의 생활체육 참여자들을 표집 하여 그들의 운동중독요인(사회적 문제, 운동의존, 금단증세, 운동동기, 운동욕구)에 영향을 주는 운동행동(빈도, 시간, 강도, 기간)변인들의 예측력을 분석하는데 그 목적을 두었다. 측정도구는 Adams(2001)와 Ogden 등(1997)의 선행연구를 토대로 김재훈(2007)이 개발한 운동중독질문지(EAQ)를 사용하였다. 일련의 단계적 중다회귀분석을 실시한 결과 운동참여자들의 집단별(성, 건강, 종목별) 운동행동변인은 대부분의 운동중독요인에 유의한 영향력을 보였다. 이러한 결과를 토대로 사회·심리측정적 관점과 운동중독의 특수성과 관련하여 논의하였으며, 집단별 운동행동변인이 운동중독에 차이 있는 영향을 미칠 수 있다는 예상을 제공하였다. 마지막으로, 이 연구는 운동참여자들의 운동중독에 대한 미래 연구방향에 대하여 논의하였다. The purpose of this study of 625 participants exercise participants their addiction to the sampling factors (social probleme, exercise dependence, withdrawal symptoms, exercise motivation, desire Movement) actions that affect the exercise behavior(frequency, time, intensity, duration) for factors of prediction. Measurement tools are Adams (2001) and Ogden (1997), the leading research Kim, jae-hoon (2007), based on the questionnaire developed by the exercise addiction (EAQ) is used. Results of the exercise participants conducted a series of phased Stepwise Multiple Regression Analysis a group (Gender, Health, iteml)for factors exercise behavior is acting factors, the most significant impact of exercise addiction. Based on the results of these social and psychological side of the static point of view of the peculiarity related to the discussions and exercise addiction, and is addicted to the exercise behavior for factors acting exercise a group difference can be expected to affect the offer. Finally, the study suggested that exercise addiction for the participants of the exercise and discuss the direction of future research.

주어진 정사각형 영역안의 점들의 가중치 합의 최대화

김재훈,Kim, Jae-Hoon 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2

In this paper, when points with weights are given in a plane, for an arbitrary constant r, we shall find a square area S such that the sum of weights of points belonging to S is maximized. If the length of the side of S is not given, the problem to find arbitrary rectangular area has been studied. In this paper, we will consider the problem to find a square area with a side of a length r when a constant r is given. We will solve the one dimensional problem in dynamic environment and propose an algorithm with the time complexity of O(nlogn+rn). 본 논문에서는 평면상에 가중치를 가진 점들이 주어질 때, 임의의 상수 r에 대해서 변의 길이 r인 정사각형 영역을 고려해서 이 안에 속하는 점들의 가중치 합이 최대가 되는 영역을 찾고자 한다. 변의 길이가 정해져 있지 않은 경우에 임의의 사각형 영역을 찾는 문제에 대한 연구가 있었다. 본 논문에서는 상수 r이 주어질 때, 변의 길이 r인 정사각형 영역을 찾는 문제를 다룬다. 우리는 동적 환경 하에서의 일차원 문제를 풀고, 이를 이용해서 O(nlogn+rn) 시간 복잡도를 갖는 알고리즘을 제안한다.

플렉시블 LCD 모드

김재훈,Kim, Jae-Hun 한국정보디스플레이학회 2006 인포메이션 디스플레이 Vol.7 No.3

내경-후교통 동맥류 수술시 전 상상돌기 절제 유무에 대한 술전 혈관조영술의 의의

김재훈,김재민,이형중,백광흠,김충현,오석전,Kim, Jae Hoon,Kim, Jae Min,Yi, Hyeong Joong,Bak, Koang Hum,Kim, Choong Hyun,Oh, Suck Jun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.9

Objective : Internal carotid-posterior communicating artery(IC-PC) aneurysms can be clipped easily without any special preparations. Occasionally, however, it is difficult to clip the low-lying IC-PC aneurysms without some kinds of additional procedures. Clinical Material and Methods : We experienced four cases of low-lying IC-PC aneurysms, which the intradural anterior clinoidectomy and/or anterior petroclinoid fold(APF) resection was essential to expose the proximal side of the aneurysmal neck and/or proximal control. One patient harbored two low-lying IC-PC aneurysms bilaterally. The patients were divided into two groups according to the necessity of anterior clinoidectomy : Group I(n=4) that needed an intradural clinoidectomy and/or APF resection and Group II(n=29) that had IC-PC aneurysms, easily clipped without any special preparation. Also, various radiometric parameters were measured through the preoperative angiograms. Results : The incidence of such aneurysms was 12% among a total of thirty-three surgically treated IC-PC aneurysms during lasr 3 years. Among four cases, three cases presented with subarachnoid hemorrhage and all aneurysmal sac projected to postero-inferior direction. In our study, We initially considered the necessity of intraoperative anterior clinoid process(ACP) removal and/or resection of APF in cases of shorter distance less than 5.6mm between the proximal aneurysmal sac and tip of the ACP(p<0.001), and the proximal portion of aneurysmal neck has located below the interclinoid line(p=0.001). Conclusion : Through a careful preoperative evaluation, some radiometric parameters can be used to determine whether the ACP should be removed in clipping of the low-lying IC-PC aneurysms. Unlike to total removal of the ACP, the intradural partial anterior clinolidectomy and/or APF resection, which are more familiar to surgeons, reduce the risks of the premature rupture, operative time, and also contribute a more precise clip placement with proximal control than the extradural clinoidectomy.

선형회귀법을 이용한 절연유에 용존된 furfural과 CO, CO₂ 가스 함유량 간의 상관관계 분석

김재훈,박두기,한상옥,Kim, Jae-Hoon,Park, Doo-Gie,Han, Sang-Ok 대한전기학회 2010 전기학회논문지 P Vol.59 No.2

When paper which was applied as insulation in oil-filled transformer was aged by thermal, its electrical, mechanical and chemical characteristics were changed and deteriorated. Therefore operating temperature was more higher, damage of paper was more quicker. Insulating paper which was generally made with cellulose was degraded, polymer of long length chain was decomposed as a monomer and CO, $CO_2$ gas and/or by-product such as furfural was produced from paper at the same time. In according with detection these gas and furfural by dissolved gas analysis(DGA) and high performance liquid chromatography(HPLC), we have investigated effects of CO, $CO_2$ gas and furfural on insulation of paper. Also we have analyzed for correlation between furfural and CO, $CO_2$ gas using linear regression method that was known as useful, credible statistical analysis.

문서 확장을 이용한 표제어 검색시스템

김재훈,김형철,Kim, Jae-Hoon,Kim, Hyung-Chul 한국과학기술정보연구원 과학기술정보센터 2011 Journal of Information Science Theory and Practice Vol.42 No.4

A headword finding system is defined as an information retrieval system using a word gloss as a query. We use the gloss as a document in order to implement such a system. Generally the gloss is very short in length and then makes very difficult to find the most proper headword for a given query. To alleviate this problem, we expand the document using the concept of query expansion in information retrieval. In this paper, we use 2 document expansion methods : gloss expansion and similar word expansion. The former is the process of inserting glosses of words, which include in the document, into a seed document. The latter is also the process of inserting similar words into a seed document. We use a featureless clustering algorithm for getting the similar words. The performance (r-inclusion rate) amounts to almost 100% when the queries are word glosses and r is 16, and to 66.9% when the queries are written in person by users. Through several experiments, we have observed that the document expansions are very useful for the headword finding system. In the future, new measures including the r-inclusion rate of our proposed measure are required for performance evaluation of headword finding systems and new evaluation sets are also needed for objective assessment. 표제어 검색시스템은 뜻풀이를 질의로 간주하는 정보검색 시스템이다. 이러한 시스템을 구축하기 위한 가장 간단한 방법으로 사전의 표제어 뜻풀이(사전 뜻풀이)를 문서로 간주하는 정보검색 시스템을 구축하는 것이다. 이 문서의 길이가 너무 짧아 사용자 질의(사용자 뜻풀이)에 대한 적절한 표제어를 검색하기 어렵다. 이 문제를 완화하기 위해서 본 논문에서는 정보검색에서 사용되는 질의 확장 개념을 문서 확장에 적용한다. 본 논문에서는 문서 확장 방법으로는 뜻풀이 확장과 유의어 확장을 사용한다. 뜻풀이 확장은 주어진 단어의 사전 뜻풀이에 속하는 단어의 뜻풀이를 문서에 포함시키는 방법이고, 유의어 확장은 무자질 군집화 알고리즘을 통해서 유의어를 찾고, 찾아진 유의어를 문서에 포함시키는 방법이다. 제안된 표제어 검색시스템은 사전 뜻풀이 그 자체를 입력으로 할 때, 16-포함률이 거의 100%에 달하였다. 또한 사용자 뜻풀이를 입력으로 할 때, 20-포함률이 66.9%였다. 사용자 뜻풀이가 단어의 의미를 충분히 전달할 수 없는 것으로 관찰되었으며 앞으로 정확하고 객관적인 평가를 위해서 평가 집합에 대한 연구가 추가적으로 필요한 실정이다.

기계학습 기반 개체명 인식을 위한 사전 자질 생성

김재훈,김형철,최윤수,Kim, Jae-Hoon,Kim, Hyung-Chul,Choi, Yun-Soo 한국과학기술정보연구원 과학기술정보센터 2010 Journal of Information Science Theory and Practice Vol.41 No.2

오늘날 정보 추출의 한 단계로서 개체명 인식은 정보검색 분야 뿐 아니라 질의응답과 요약 분야에서 매우 유용하게 사용되고 있다. 개체명은 일반 단어와 달리 다양한 문서에서 꾸준히 생성되고 변화되고 있다. 이와 같은 개체명의 특성 때문에 여러 응용 시스템에서 미등록어 문제가 야기된다. 본 논문에서는 이런 미등록어 문제를 해결하기 위해 기계학습 기반 개체명 인식 시스템을 위한 새로운 자질 생성 방법을 제안한다. 일반적으로 기계학습 기반 개체명 인식 시스템은 단어 단위의 자질을 사용하므로 구절 단위의 개체명을 그대로 자질로 사용할 수 없다. 이 문제를 해결하기 위해 본 논문에서는 새로운 구절 단위의 정보를 단어 단위의 자질로 변환하는 자질 생성 방법을 제안하였다. 이 방법으로 개체명 사전과 WordNet을 개체명 인식의 자질로 사용할 수 있었다. 그 결과 영어 개체명 시스템은 F1 점수의 약 6%가 향상되었고 오류의 약 38%가 줄어들었다. Now named-entity recognition(NER) as a part of information extraction has been used in the fields of information retrieval as well as question-answering systems. Unlike words, named-entities(NEs) are generated and changed steadily in documents on the Web, newspapers, and so on. The NE generation causes an unknown word problem and makes many application systems with NER difficult. In order to alleviate this problem, this paper proposes a new feature generation method for machine learning-based NER. In general features in machine learning-based NER are related with words, but entities in named-entity dictionaries are related to phrases. So the entities are not able to be directly used as features of the NER systems. This paper proposes an encoding scheme as a feature generation method which converts phrase entities into features of word units. Futhermore, due to this scheme, entities with semantic information in WordNet can be converted into features of the NER systems. Through our experiments we have shown that the performance is increased by about 6% of F1 score and the errors is reduced by about 38%.

LNG 저장탱크용 9% Ni강 용접부의 저온피로균열진전 특성

김재훈,심규택,김영균,안병욱,Kim, Jae-Hoon,Shim, Kyue-Taek,Kim, Young-Kyun,Ahn, Byoung-Wook 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5

The fatigue crack growth characteristics of base metal and weld joint of 9% Ni steel for LNG storage tank was carried out using CT specimen at room temperature and $-162^{\circ}C$. Fatigue crack growth rate of base and weld metals at RT and $-162^{\circ}C$ was coincided with a single line independent of the change of stress ratio and temperature. In the region of lower stress intensity factor range, fatigue crack growth rate at $-162^{\circ}C$ was slower than that at RT, and the slop of fatigue crack growth rate at $-162^{\circ}C$ increased sharply with propagating of fatigue crack, fatigue crack growth rate at RT and $-162^{\circ}C$ was intersected near the region of $2{\times}10-4\;mm$/cycle, and after the intersection region, fatigue crack growth rate at $-162^{\circ}C$ was faster than that at RT. The micro-fracture mechanism using SEM shows the ductile striation in the stable crack growth region. Also the defects of weld specimen after fatigue testing were detected using the A scan of ultrasonic apparatus.

차세대 LCD 구현을 위한 Printable Electronics 기술 개발 동향

김재훈,이유진,Kim, Jae-Hun,Lee, Yu-Jin 한국정보디스플레이학회 2011 인포메이션 디스플레이 Vol.12 No.1