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OFDMA 다중률 비디오 멀티캐스트 전송에서 스케줄링 방식의 장기적 성능 평가
홍진표(Jin Pyo Hong),한민규(Minkyu Han) Korean Institute of Information Scientists and Eng 2016 정보과학회논문지 Vol.43 No.2
The orthogonal frequency-division multiple access (OFDMA) systems are well suited to multi-rate multicast transmission, as they allow flexible resource allocation across both frequency and time, and provide adaptive modulation and coding schemes. Unlike layered video coding, the multiple description coding (MDC) enables flexible decomposition of the raw video stream into two or more substreams. The quality of the video stream is expected to be roughly proportional to data rate sustained by the receiver. This paper describes a mathematical model of resource allocation and throughput in the multi-rate video multicast for the OFDMA wireless and mobile networks. The impact on mean opinion score (MOS), as a measurement of user-perceived quality (by employing a variety of scheduling disciplines) is discussed in terms of utility maximization and proportional fairness. We propose a pruning algorithm to ensure a minimum video quality even for a subset of users at the resource limitation, and show the optimal number of substreams and their rates can sustain.
배기가스 세정장치내 유체 유동에 대한 다공성 매질 적용 기반의 전산해석적 연구
홍진표(Jin-pyo Hong),윤상환(Sang-hwan Yoon),윤현규(Hyeon-kyu Yoon),김래성(Lae-sung Kim),안준태(Jun-tae An) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
Exhaust gases emitted from internal combustion engines contain nitrogen oxides (NOx) and sulfur oxides (SOx), which are major air pollutants causing acid rain, respiratory diseases, and photochemical smog. As a countermeasure, scrubber systems are being studied extensively. In this study, the pressure drop characteristics were analyzed by changing the exhaust gas inflow velocity using a scrubber for a 700 kW engine as a model. In addition, the fluid flow inside the scrubber and the behavioral characteristics of the droplets were studied using CFD, and the design compatibility of the cleaning device was verified. Flow analysis was performed using inertial and viscous resistances by applying porous media to the complex shape of the scrubber. The speed of the exhaust passing through the outlet nozzle from the inlet was determined through the droplet behavior analysis by spraying, and the flow characteristics for the pressure drop were studied. In addition, it was confirmed through computational analysis whether there was a stagnation section in the exhaust gas flow in the scrubber or the sprayed droplets were in good contact with the exhaust gas.
카노 모델을 이용한 고창 자연마당의 서비스 품질 속성 분류
홍진표 ( Hong¸ Jin-pyo ),심윤진 ( Shim¸ Yun-jin ),강필구 ( Kang¸ Pil-goo ),최영자 ( Choi¸ Young-ja ),어양준 ( Eo¸ Yang-jun ),서경원 ( Seo¸ Kyung-won ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.4
This study was conducted to classify quality attributes for quality elements of public service targeting Gochang Jayeonmadang and analyze their impact on resident satisfaction and dissatisfaction by each service quality element by using the Kano model and the customer satisfaction coefficient and dissatisfaction coefficient of Timko(1993). As a result of the study, all 20 quality elements of public service were classified as one-dimensional attributes. Since the Jayeonmadang project restores the damaged natural environment and restores the ecosystem, it is judged that satisfaction is proportionately satisfied as the natural environment has been restored and the ecosystem has been restored. According to Timko (1993)’s analysis of customer satisfaction coefficient, it is believed that the most effective way to improve residents’ satisfaction is to carefully establish and implement maintenance plans and to create a good environment to ensure that plants have settled.
Jin-pyo Hong(홍진표),Sang-hwan Yoon(윤상환),Hyeon-kyu Yoon(윤현규),Jung-Tae Kim(김정태),Jun-Tae An(안준태) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.8
Gears, which rotate and transmit power by interlocking two cogwheels, were invented in BC. They have been used in various systems, including industrial machinery, transportation devices, and living facilities, through the industrial revolution. Regardless of how they are used, gears are a major source of noise and vibration. Many effective measures are being taken to reduce the radiation noise generated from gears, most commonly by lubrication. Lubrication in gear units reduces friction on interlocking gear surfaces, dampening radioactive noise. This can be very useful for quiet gear design if these lubricating damping effects can be reflected in the analytical phase for gear design. This study experimentally confirms the properties of lubricated and non-lubricated radioactive noise by designing a decelerator gearbox and analyzing the radioactive noise characteristics by torque, rotation, and the number of gears using computer analysis.
홍진표(Jin-Pyo Hong),박종익(Jong-Ik Park),방수영(Soo-Young Bhang),서동우(Tong-Woo Suh),여진영(Jin-Young Yeo),조성진(Seong-Jin Cho),조맹제(Maeng-Je Cho),한오수(Oh-Su Han) 대한사회정신의학회 2003 사회정신의학 Vol.8 No.2
목적: 노숙자 숙소에 거주하던 노숙자들을 1년간 추적하여 노숙생활 중 정신질환의 유병이 사회적 재활과 의료이용 등의 경과에 미치는 영향을 살펴보고자 하였다. 연구 방법: 2000년 서울 시내 1개 노숙자 숙소에서 정신과 진단평가를 받은 220명을 대상으로 1년 뒤 직접 면담 및 노숙자 숙소 자료 분석을 통하여 추적 조사하였다. 우울장애, 알콜장애, 병발장애군을 정신질환이 없던 노숙자군과 비교하여 외부 작업횟수, 노숙자 숙소 거주기간, 퇴소 형태, 현재 거주형태, 신체질환 및 의료서비스 이용행태를 살펴보았다. 결과: 노숙자들은 정신질환 유무에 따라 경과에 차이를 보였다. 우울장애가 있는 노숙자군은 노숙자 숙소에 가장 오래 머물렀고, 외부작업은 가장 적게 하였다. 알콜사용장애가 있는 노숙자군은 노숙자 숙소에 가장 짧게 있었고, 재입소가 많았다. 의료서비스 이용면에서 우울장애환자들이 가장 많은 신체질환을 앓고 있었다. 노숙자들은 1년간 많은 이동을 하여 추적 관리가 어려웠다. 결론: 노숙자에서 정신질환이 있는 경우 사회 재활에 악영향을 주었다. 정신질환을 앓고 있는 노숙자를 위한 별도의 재활 프로그램 개발 및 제공이 필요하다.
종설논문 : 의사-제약회사 상호작용이 처방에 미치는 영향
홍진표 ( Jin Pyo Hong ),박상은 ( Sang Eun Park ),고윤석 ( Youn Suck Koh ) 한국의료윤리학회 2011 한국의료윤리학회지 Vol.14 No.2
The relationship between the medical profession and the pharmaceutical industry has received considerable attention in recent years in Korea. In this article we examine the impact of physician-pharmaceutical industry interaction (PPII) on physician prescriptions. While physicians` decisions concerning prescriptions are influenced by many factors, two of the most influential are the visits of sales representatives from pharmaceutical companies and the gifts and other enticements that pharmaceutical companies provide for physicians. Patients regard gifts from pharmaceutical companies as less appropriate and more influential than do physicians. Inappropriate relations between physicians and pharmaceutical companies can damage physician-patient relationships and harm the medical profession as a whole. Recent investigations in the United States and Korea have found many illegalities in physician-pharmaceutical industry interaction. The article argues for the urgent need to develop clear ethical codes and compliance mechanisms concerning PPII.
수변녹지 조성을 위한 토지매수 우선순위 산정 방안 연구
홍진표 ( Jin Pyo Hong ),이재원 ( Jae Won Lee ),최옥현 ( Ok Hyun Choi ),손주동 ( Ju Dong Son ),조동길 ( Dong Gil Cho ),안동만 ( Tong Mahn Ahn ) 한국환경복원기술학회 2014 한국환경복원기술학회지 Vol.17 No.4
The Korean government has purchased land properties alongside any significant water bodies before setting up the buffers to secure water qualities. Since the annual budgets are limited, however, there has always been the issue of which land parcels ought to be given the priority. Therefore, this study aims to develop efficient mechanism for land acquisition priorities in stream corridors that would ultimately be vegetated for riparian buffer zones. The criteria of land acquisition priority were driven through literary review along with experts` advice. The relative weights of their value and priorities for each criterion were computed using the Analytical Hierarchy Process(AHP) method. Major findings of the study are as follows: 1. The decision-making structural model for land acquisition priority focuses mainly on the reduction of non-point source pollutants(NSPs). This fact is highly associated with natural and physical conditions and land use types of surrounding areas. The criteria were classified into two categories-NSPs runoff areas and potential NSPs runoff areas. 2. Land acquisition priority weights derived for NSPs runoff areas and potential NSPs runoff areas were 0.862 and 0.138, respectively. This implicates that much higher priority should be given to the land parcels with NSPs runoff areas. 3. Weights and priorities of sub-criteria suggested from this study include: proximity to the streams(0.460), land cover(0.189), soil permeability(0.117), topographical slope(0.096), proximity to the roads(0.058), land-use types(0.036), visibility to the streams(0.032), and the land price(0.012). This order of importance suggests, as one can expect, that it is better to purchase land parcels that are adjacent to the streams. 4. A standard scoring system including the criteria and weights for land acquisition priority was developed which would likely to allow expedited decision making and easy quantification for priority evaluation due to the utilization of measurable spatial data. Further studies focusing on both point and non-point pollutants and GIS-based spatial analysis and mapping of land acquisition priority are needed.