VOD 시스템에서의 Interchange Agent 운영 알고리즘

강석훈,박수현,Kang, Seok-Hoon,Park, Su-Hyun 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.8

기존 VoD 시스템의 멀티캐스트 방법은 사용자의 요청수가 증가함에 따라 시스템 부하가 증가하게 되어 시스템의 성능이 떨어지게 된다. 본 논문에서는 사용자들이 빈번하게 요청하는 인기비디오에 대한 정보를 프록시 서버에 저장 관리하여, 사용자들의 비디오 요청 시 발생하는 네트워크의 사용과 서버의 부하를 줄이는 방법에 대해 연구하였다. 본 논문에서는 효율적인 VoD 서비스를 위해 멀터 프록시(Multi-Proxies)들을 관리하는 Interchange Agent(IA)를 구축하였다. 이를 위해, 멀티캐스팅 기법을 이용하여 사용자의 동일 비디오 요청을 하나로 묶어 처리하여 네트워크 및 서버의 부하를 줄고, 자신의 리스트를 이용하여 멀티프록시 캐시의 내용을 중복 없이 관리하여 시스템 효율을 높이며, 스위칭 기능을 통하여 사용자가 요청한 비디오가 연결된 다른 프록시에 존재하면 이를 스위칭 채널을 통해 즉시 전송하여 실시간 서비스의 효율을 높이고, 각 프록시 캐시의 임시저장장소와 카운터를 이용하여 사용자의 인기비디오 순위 변경 시, 캐시의 내용을 변경하여 그 흐름을 반영하도록 하였다. This paper proposes a approach to configure efficient video-on-demand system by introducing Multicast and Cache Video-on-Demand (MCVoD) system. As a key element or the MCVoD system, interchange agent provides this system with multicasting and switching functions. With the multicasting, the MCVoD system is able to reduce the load on the network as well as VoD servers by transmitting only one video request instead of sending multiple requests on a same video stream. The switching enables clients to receive the lust stream of requested video streams instantly without waiting time and also allows avoiding undesirable duplication of video streams in the system. With various experiment results through simulation about waiting tine and cache hit ratio, we show that the MCVoD system employing the interchange agent provides better performance than current uni-proxy based system.

방약합편(方藥合編) 의방활투(醫方活套) 중(中) 시호(柴胡)가 배합(配合)된 방제(方劑)에 관한 고찰(考察)

강석훈,이진호,권동렬,Kang, Suk-Hoon,Lee, Jin-Ho,Kwon, Dong-Yeul 대한한의학방제학회 2012 大韓韓醫學方劑學會誌 Vol.20 No.2

Objectives : Bangyakhappyeon was classified into three tongs of prescription. When juxtaposed with existing publications on oriental medicine, this composition was considerably original. Due to its ease of searching for diseases and prescription, it has been read by not only doctors and researchers but also among general citizens alike. Based on the fundamentals of Bangyakhappyeon composition, this thesis focused on the thorough research on the prescription of Bupleuri Radix mixture. Methods : 42 prescriptions of Bupleuri Radix mixtures have been divided in to three tongs based on the composition of Bangyakhappyeon. Then, these prescriptions, dosage, and composition were researched and organized. Results : After analyzing the prescription of Bupleuri Radix mixture in the Uibanghwaltu chapter of the Bangyakhappyeon text, the following results were attained. 1. Of the 42 prescriptions of Bupleuri Radix mixtures, jungtong constitutes the most prescription at 30, 8 at hatong, and 4 at sangtong. 2. 42 prescriptions are documented into 18 medical divisions and 44 disease symptoms. 3. After analyzing the prescription dosage of Bupleuri Radix mixture, the dosage of Bupleuri Radix was 3 puns to 4 jeons used in 14 sections. Most use was 1 jeon 14 prescriptions, 33.3% were recorded. 4. Invigorating vital function, catharsis, malaria, mediation method, and clearing away method of Bupleuri Radix have a close relationship with the dosage. 5. The 42 prescriptions formation of using Bupleuri Radix consisted of decoction at 39 prescriptions (92.9%) and the others at 3 prescriptions (7.1%). 6. As a result of researching the component of the prescription of Bupleuri Radix mixture, Sosihotang, Soyosan and Bojungikgitang were used as the basic prescription. Conclusions : prescription of Bupleuri Radix mixture in Uibanghwaltu of Bangyakhappyeon as based on Sosihotang, Soyosan and Bojungikgitang, combined with various oriental medicine was found to treat many kinds of diseases.

마찰교반접합부의 미세조직 관찰 및 유동해석

강석훈,조재형,이창길,김성준,오규환,한흥남,Kang, Suk-Hoon,Cho, Jae-Hyung,Lee, Chang-Gil,Kim, Sung-Joon,Oh, Kyu-Hwan,Han, Heung-Nam 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5

혼백(魂魄)의 관계에 대한 문헌적 고찰(考察)

강석훈,이진호,강옥화,권동렬,Kang, Suk-Hoon,Lee, Jin-Ho,Kang, Ok-Hwa,Kwon, Dong-Yeul 대한한의학방제학회 2012 大韓韓醫學方劑學會誌 Vol.20 No.1

Objectives : Ethereal soul and Corporeal soul are very important part of mental activities that have researched and studied not only by ancient medical scientists but also by philosophers and thinkers in historical literature. Methods : There are some differences between ethereal soul and corporeal soul in terms of meaning, generative process, organs and the effects over the human body although they have been studied for a long time and have influenced on each other. Results : The perception of ethereal soul and corporeal soul are considerably limited in Korean medicine compared to their contribution of biological activities. The relationship of the positive and negative, yin and yang, is not even classified. So there is a general lack of understanding of ethereal soul and corporeal soul in oriental medicine course. Conclusions : Therefore, this thesis is designed for discussing the origin and relation of ethereal soul and corporeal soul. Also it would be explained the effect in terms of sleeping that is related Ethereal soul and Corporeal soul.

연천 사고 피해 PTSD 환자의 해마 용적 : 8개월 추적 연구

강석훈,김태용,이수영,정문용,최진희,정혜경,김재천,Kang, Suk-Hoon,Kim, Tae-Yong,Lee, Soo-Young,Chung, Moon-Young,Choi, Jin-Hee,Chung, Hae-Gyung,Kim, Jae-Chun 대한불안의학회 2007 대한불안의학회지 Vol.3 No.2

Objective : This study was conducted to evaluate the relation between symptoms and hippocampal volume in patients with posttraumatic stress disorder (PTSD). Methods : Eight patients with PTSD and five normal controls were enrolled in the present study. The severity of PTSD symptoms was measured using the clinician administered PTSD scale (CAPS), Hamilton Rating Scale for Depression (HAMD), Hamilton Anxiety Rating Scale (HAMA). Magnetic resonance imaging (MRI) was used to measure hippocampal volume. Results : There were significant differences in the CAPS, HAMD, and HAMA scores between the PTSD patients and normal controls. The left and right hippocampal volumes were smaller in the PTSD patients than in the normal controls, but this difference was not statistically significant. The results showed that PTSD symptoms were not related to hippocampal volume. Conclusion : In this study, we could not identify a difference in hippocampal volume between normal controls and patients with PTSD at eight months after trauma. Future research with different subjects and a larger sample size is needed in order to confirm the difference in hippocampal volume.

안정화된 만성 정신분열병 환자에서 강박장애 동반과 사회적 기능

강석훈,석정호,김찬형,김윤중,김형주,최종혁,Kang, Suk-Hoon,Seok, Jung-Ho,Kim, Chan-Hyung,Kim, Yoon-Joong,Kim, Hyoung-Ju,Choi, Jong-Hyuck 대한불안의학회 2011 대한불안의학회지 Vol.7 No.1

Objective : This study aimed to investigate the prevalence of obsessive-compulsive disorder (OCD) in schizophrenia, and the relationship among OCD, severity of psychopathology, and social function in stable patients with chronic schizophrenia. Methods : We interviewed 138 symptom-stable inpatients who had been on a constant dose of antipsychotics for at least 1 month prior and diagnosed as chronic schizophrenia. Subsequently, patients were classified according to the existence of OCD as investigated using the Structured Clinical Interview for DSM-IV Axis I disorders (SCID-I) and the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Further, all clinical and demographic data was investigated. To investigate potential interrelationships, the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), Korea-Positive and Negative Symptom Scale (K-PANSS), and the Korean Personal and Social Performance (K-PSP) were used. An independent ttest and Chi-square test were used to compare groups and a Pearson's correlation coefficient was used to assess the relationship between the Y-BOCS and other clinical rating scales. Results : The prevalence of OCD in schizophrenia patients was 18.1%. Patients with schizophrenia and OCD exhibited significantly earlier onset of schizophrenia, more severe psychiatric symptoms, and lower personal and social performance ability as compared to those without OCD. There was no significant relationship among Y-BOCS, K-PANSS, and K-PSP. Conclusion : We found that comorbid OCD was relatively more frequent in patients with schizophrenia. An investigation involving larger samples of schizophrenia patients with OCD with respect to social function and thus, the effect on quality of life is required.

巨視勞動變數의關係 : 韓國의 生産性, 失業率, 賃金

강석훈,한진수 ( Seog Hoon Kang,Jin Soo Hahn ) 한국경제학회 1998 經濟學硏究 Vol.46 No.2

이 연구에서는 거시노동경제학의 핵심변수인 생산성, 실업률, 임금의 시계열자료를 이용해 이 들 사이의 동태적인 인과관계를 분석한다. 오차수정모형을 통해 이 세 변수 사이의 동태영향을 분석해 본 결과 생산성이 중심역할을 하고 있음을 알 수 있다. 생산성과 임금 사이에는 쌍방의 인과관계가 존재하여 효율임금이론과 성과배분제가 우리 나라 통계에 의해 지지되고 있음도 확인할 수 있다. 이는 기업이 양질의 노동력을 확보하기 위해 높은 임금을 지불했고 높은 임금에 고용된 양질의 근로자는 근로의욕 제고, 교육 및 훈련에 의한 인적 자본축적을 통해 생산성을 향상시키는 선순환이 발생한 데 기인한다. 반면에 임금과 실업률 사이에는 어느 방향으로도 인과관계가 발견되지 않아 내쉬협상이론이 우리 나라 통계에 의해 지지되지 않고 있다. 이는 노동조합과 기업 사이의 임금협상의 역사가 비교적 짧고, 그나마 임금결정도 노동시장의 고용상태에 크게 의존하지 않는 경향이 있었기 때문이다. 마지막으로 실업률과 생산성 사이에는 역의 관계가 발견되는 데, 이는 그 동안 우리 경제에 긍정적인 수요충격이 부정적인 공급충격을 압도했었다는 것을 의미한다.

외상후 스트레스장애 환자에서 장기 치료에 따른 카테콜아민과 코르티솔 변화

강석훈,정문용,김태용,정혜경,Kang, Suk-Hoon,Chung, Moon-Young,Kim, Tae-Yong,Chung, Hae-Gyung 대한불안의학회 2008 대한불안의학회지 Vol.4 No.1

Objective : This study was conducted to evaluate the changes in the levels of neurotransmitters and cortisol in patients with chronic posttraumatic stress disorder (PTSD) and to evaluate their correlation with symptoms after long-term pharmacological treatment. Methods : Twenty-eight Vietnam veterans with chronic PTSD and 34 non-PTSD patients were consecutively recruited. The Combat Exposure Scale (CES), Mississippi Scale for Combat-Related Posttraumatic Stress Disorder (M-PTSD), Clinician Administered PTSD Scale (CAPS), Hamilton Rating Scale for Depression (HRSD) and Hamilton Anxiety Scale (HAS) were used to evaluate symptom severity. High performance liquid chromatography (HPLC) was used to measure the plasma levels of epinephrine, norepinephrine, and dopamine, and a radioimmunoassay (RIA) was performed to evaluate the plasma level of cortisol. Results : Plasma cortisol was significantly lower in PTSD patients than in control subjects, while there was no significant difference in plasma epinephrine, norepinephrine and dopamine between the two groups. The scores of M-PTSD, CAPS, HAMD and HAMA were signigicantly higher in PTSD patients than control group. Conclusion : After long-term treatment, the levels of neurotransmitters in PTSD patients returned to within the normal range, and the patients' symptoms showed some improvement. However, the core symptoms of PTSD continued to appear intermittently, and they are thought to be associated with hormonal systems, such as the HPA axis. It is also suggested that PTSD should be considered to be a complex disorder associated with multiple systems and that combinations of the effective medications for each system should be used to treat patients with PTSD.

적응적 패럴랙스 베리어를 위한 사용자 위치 추적 방법

강석훈,Kang, Seok-Hoon 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.12

이 논문에서는 적응적 패럴랙스 베리어 방식에서, 시청영역을 제어할 수 있도록 사용자의 위치를 추적하는 방법을 제안한다. 얼굴자세에 강건한 양안거리 측정을 위해, 형태모델과 랜드마크 기반인 CLM으로 자세를 추정한다. 카메라와의 상관관계로, 거리와 수평위치를 거리로 변환한다. 사용자의 눈의 위치에 따라 적응적 패럴랙스 베리어의 화소간격을 조정하고, 베리어를 이동해 시청영역을 조정한다. 이 논문에서는 60cm부터 490cm의 범위에서 사용자를 추적하는 방법을 제안하고, 카메라 영상의 해상도에 따른 에러, 측정 가능 범위, fps를 측정하였다. 그 결과, 사용자를 평균 3.1642cm의 절대오차 범위내로 측정 가능하였으며, 영상의 해상도에 따라 320×240에서 약 278cm, 640×480에서 약 488cm까지, 그리고 1280×960에서 약 493cm까지를 측정할 수 있었다. This paper propose how to track the position of the observer to control the viewing zone using an adaptive parallax barrier. The pose is estimated using a Constrained Local Model based on the shape model and Landmark for robust eye-distance measurement in the face pose. Camera's correlation converts distance and horizontal location to centimeter. The pixel pitch of the adaptive parallax barrier is adjusted according to the position of the observer's eyes, and the barrier is moved to adjust the viewing area. This paper propose a method for tracking the observer in the range of 60cm to 490cm, and measure the error, measurable range, and fps according to the resolution of the camera image. As a result, the observer can be measured within the absolute error range of 3.1642cm on average, and it was able to measure about 278cm at 320×240, about 488cm at 640×480, and about 493cm at 1280×960 depending on the resolution of the image.

배리어 유전체 방전을 이용한 전기 집진부에서의 나노 입자 집진 효율

강석훈,지준호,변정훈,황정호,Kang, Suk-Hoon,Ji, Jun-Ho,Byeon, Jeong-Hoon,Hwang, Jung-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.11

Although dielectric barrier discharge (DBD) in air has been applied to a wider range of aftertreatment processes for HAPs (Hazardous Air Pollutants), due to its high electron density and energy, its potential use as precharging dust particles is not well known. In this work, we measured size distributions of bimodal aerosol particles and estimated collection efficiency of the particles by an electrostatic precipitator (ESP) using DBD as particle charger. To examine the particle collection with DBD charger, nano size particles of NaCl(20∼100nm) and DOS (50∼500nm) were generated by a tube furnace and an atomizer, respectively. For experimental conditions of 60㎐, 11㎸ and 60 lpm, the particle collection efficiency for the hybrid system was over 85%, based on the number of particles captured.