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윤대식,이정엽 영남대학교 지역발전연구소 1998 새마을지역개발연구 Vol.22 No.-
The main objective of this research is to analyze urban workers' multi-destination travel choice behavior. For this research, two alternative travel pattern choice models were empirically estimated by using a survey data collected from Kyongsan and Yeungchun City. For this research, two alternative nested logit model structures were employed. These two alternative model strums are based on two different behavioral hypotheses. One is hypothesized that urban workers' daily travel pattern choice behavior is represented by two stages of choices With single-destination or multi-destination travel pattern choice as the higher stage, and the number of tours as the lower stage. The other model is hypothesized that urban workers' daily travel pattern choice behavior is represented by two stages of choices with single-destination or multi-destination travel pattern choice as the higher stage, and the number of stops as the lower stage. From the empirical results, it is found to be more sensible to represent urban workers' daily travel patterns as the nested logit model structure with single-destination or multi-destination travel pattern choice as the higher stage, and the number of tours as the lower stage.
Intermittent Operation of Off-Axis Modes in a Multi-Transverse Mode
Dae-Sic Lee,Chil-Min Kim,Konstantine V. Volodchenko,Young-Jai Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
We find that when a cw Nd : YAG laser generates a complex multi-transverse-mode pattern, some laser spots in the pattern are operated intermittently. We study the intermittent generation of the laser spots and nd that the laser spots are off-axis modes. Through an analysis of the probability distribution of the length of the laser-off state, we nd that the phenomenon is on-off intermittency.
Vision Sensor를 사용하는 로봇지식 관리를 위한 Rule 기반의 인식 오류 검출 필터
이대식(Lee Dae Sic),임기현(Lim Gi Hyun),서일홍(Suh Il Hong) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
지능 로봇은 표현 가능한 사물, 공간을 모델링하기 위해 주변 환경을 인지하고, 자신이 수행할 수 있는 행동을 결합하여 임무를 수행하게 된다. 이를 위해 온톨로지를 사용하여 사물, 공간, 상황 및 행동을 표현하고 특정 임무 수행을 위한 자바 기반 Rule을 통해 다양한 추론 방법을 제공하는 로봇지식 체계를 사용하였다. 사용된 로봇 지식 체계는 생성되는 인스턴스가 자료의 클래스와 속성 값이 일관성 있고 다른 자료와 모순되지 않음을 보장해 준다. 이러한 로봇 지식 체계를 효율적으로 사용하기 위해서는 완전한 온톨로지 인스턴스의 생성이 밑받침 되어야 한다. 하지만 실제 환경에서 로봇이 Vision Sensor를 통해 사물을 인식할 때 False Positive, False Negative와 같은 인식 오류를 발생시키는 문제점이 있다. 이를 보완하기 위해 본 논문에서는 물체와 물체간의 Spatial Relation. Temporal Relation과 각 물체마다의 인식률 및 속성을 고려하여 물체 인식 오류에서도 안정적으로 인스턴스 관리를 가능하게 하는 Rule 기반의 인식오류 검출 필터를 제안한다.
강인한 지식 등록 방법을 통한 동적 환경에서의 로봇 지식 갱신
이대식(Dae Sic Lee),임기현(Gi Hyun Lim),서일홍(Il Hong Suh) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.5
Incomplete knowledge instances may be registered from misidentifications of sensors, such as vision sensor. In previous study, we proposed robust object instance registration method to robot centered knowledge framework to guarantee the consistency of the registered knowledge. In real environment, a persistent update is necessary due to the objects can be moved dynamically. In this paper, we propose the way to update robot knowledge continually using the registration method. Our experiment in this paper shows that sound and complete knowledge can be registered and updated by the proposed method. even under imperfect sensing data.
물개회충 (Pseudoterranova Decipiens) 의 유충에 의한 위 아니사키스증 1예
김호정,이창영,김종숙,이인환,이향주,최대섭,장석,천대철,박정식,손운목 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.5
A case of gastric anisakiasis due to the larva of Pseudoterranova decipiences was con- firmed by a gastroendoscopic examination. A long whitish nematode larva invading the stomach wall (fundus) was discovered and was extracted using biopsy forceps after 3 days to the onset of symptoms. The worm was 42.6×1.1 mm size, and was identified as being a the 4th stage larva of P. decipiens, based upon its morphological characteristics, The patient, residing in Seoul, was a 51-year-old housewife, who complained of severe epi- gastric pain and recalled that she had previously eaten the raw flesh of an Astroconger myriaster in a Japanese restaurant (sushi Bar). This study probably emerges as the 7th human case of gastric anisakiasis of pseudoterranoviasis in Korea.
EVpedia: a community web portal for extracellular vesicles research.
Kim, Dae-Kyum,Lee, Jaewook,Kim, Sae Rom,Choi, Dong-Sic,Yoon, Yae Jin,Kim, Ji Hyun,Go, Gyeongyun,Nhung, Dinh,Hong, Kahye,Jang, Su Chul,Kim, Si-Hyun,Park, Kyong-Su,Kim, Oh Youn,Park, Hyun Taek,Seo, Ji H Oxford University Press 2015 Bioinformatics Vol.31 No.6
<P>Extracellular vesicles (EVs) are spherical bilayered proteolipids, harboring various bioactive molecules. Due to the complexity of the vesicular nomenclatures and components, online searches for EV-related publications and vesicular components are currently challenging.</P>
연구논문 : 국가 간 항공여객수송량 변화추이와 결정요인에 관한 연구
윤대식 ( Dae Sic Yun ),이찬휘 ( Chan Hwi Lee ) 한국지역개발학회 2015 韓國地域開發學會誌 Vol.27 No.2
This paper analyzes yearly variation of the air passenger travel volume between Korea and foreign countries. Using aggregated data, yearly variation of the air passenger travel volume is analyzed. The paper includes some descriptive statistical analyses on time-series data of the international air passenger travel volume. The analysis is conducted on the period between the year 2002 and 2012. Furthermore, some direct air travel demand models are developed by panel regression analysis for finding factors affecting the air passenger travel volume of each international route connecting Korea. The analytical results are summarized as follows. First, it is found that the air passenger travel volume for international routes connecting Korea had been increased between the year 2002 and 2012, excluding period between the year 2008 and 2009. Secondly, it is found that GDP or GDP per capita of origin and destination countries, amount of export/import between origin and destination countries, exchange rate, and the number of LCC routes(lines) between origin and destination countries are important factors affecting the air passenger travel volume between Korea and Asian countries. Thirdly, it is found that GDP of origin and destination countries, amount of export/import between origin and destination countries, and exchange rate are important factors affecting the air passenger travel volume between Korea and non-Asian countries.
Oscillation Quenching in Coupled Different Oscillators
유정완,김칠민,Dae-Sic Lee,박영재 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
When any two different nonlinear oscillators are mutually coupled with each other, their trajectories converge to their own unstable fixed points in a proper coupling strength region. We theoretically analyze the phenomenon of oscillation quenching by mutually coupling the Rössler oscillator with a linear oscillator. Also, we numerically investigate this phenomenon in the mutually coupled system of a Lorenz and a Rössler oscillator. Through these studies, we find that oscillation quenching is a universal behavior that appears when any two different oscillators are mutually coupled.