멀티홉 통신환경에서의 원격노드 실행이미지 변경 시스템

이호근(Ho Geun Lee),배장식(Jang Sik Bae),손영호(Young-Ho Sohn),이석규(Suk-Gyu Lee) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.8

The sensor network consists of a number of wireless sensor nodes. Each sensor node collects surrounding information with its appointed purpose and transmits the collected data through the wireless network. In case of renewing executable images of sensor nodes, it is done via remote image alteration management servers. The alteration of executable images at sensor nodes should be efficiently accomplished considering the resource limit of each sensor node. The existing methods for altering the executable images are done through adding additional storing memory to additional sensors or accomplishing the alteration by operating complex algorithms. This paper discusses the embodiment of an effective executable image alteration protocol and system on the platform based on ATmega128MCU and their performance evaluation. The embodiment and performance evaluation are conducted via the process layer for executable images alteration protocol.

유니티 플랫폼 게임을 위한 2D 캐릭터 컨트롤러

박영민(Park, Young Min),손영호(Sohn, Young Ho) 대구과학대학교 국방안보연구소 2021 사회융합연구 Vol.5 No.2

유니티는 3D 게임을 위한 캐릭터 컨트롤러를 제공하지만, 아직 2D 캐릭터 컨트롤러는 제공하지 않는다. 이것은 개발자가 2D 물리적 환경에서 캐릭터의 움직임을 완전하게 제어할 수 있는 유니티용 2D 캐릭터 컨트롤러를 개발하는 계기가 되었다. 이렇게 개발된 컨트롤러는 플래이어 컨트롤을 크게 제한하는 유니티의 내장된 물리 기능을 대체할 수 있다. 본 논문에서는 구현한 컨트롤러는 쉽게 구현할 수 있으면서 2D 캐릭터를 제어하기에 매우 유용한 방법을 제공함으로써 게임 속 캐릭터의 이동과 게임 환경에 존재하는 물체와의 상호작용을 정확하게 제어할 수 있다. 이 컨트롤러는 플랫폼 게임용으로 설계되었지만 물리적 환경을 돌아다니며 상호 작용하는 캐릭터가 포함된 다른 2D 게임에도 쉽게 사용할 수 있다. 그리고 간단한 구조로 구현이 되어 초보자도 쉽게 파악하고 탐색할 수 있다. 노련한 게임 개발자는 이 기본 컨트롤러를 기반으로 기능을 확장해서 응용할 수 있고, 물리 구성 요소를 구현하는 2D 게임 디자인을 위한 완전한 솔루션을 제공할 수 있다. Unity provides character controllers for 3D games, but so far, 2D character controllers are not. This is where the developer develops a 2D character controller for Unity that allows full control of the character s movements in a 2D physical environment. Controllers developed in this way can replace Unity s built-in physics, which greatly limits player control. The controller implemented in this paper can be easily implemented while controlling 2D characters. It provides a very useful way to precisely control the movement of characters in the game and their interaction with what is in the game environment. These controllers can easily be used for other 2D games that contain interacting characters while moving around the physical environment you are designing for platform games. And it is implemented in a simple structure. Experienced game developers can extend the functionality based on this basic controller and apply it, providing a complete solution for 2D game design that implements physics components.

항공 통신 기술 : 3-계층 기반의 온라인 시험 체계 구현

유추일 ( Qiu Yi Liu ),손영호 ( Young Ho Sohn ) 한국항행학회 2009 韓國航行學會論文誌 Vol.13 No.1

LEACH-C 기반의 센서 네트워크에서 효율적인 데이터 전송을 위한 LCSPL 알고리즘

정왕부(Wang-Boo Jeong),손영호(Young-Ho Sohn) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.1

The problem of using sensor nodes in the wireless sensor network is that their limited energies restrict their utilizing range. This paper proposes LCSPL(LEACH-C Steady-state Phase Looping) algorithm which uses energy efficiently by restructuring data transfer based on LEACH-C in sensor networks. The LCSPL algorithm is a technique that repeats each processing section, with exception to the process of sensor nodes sending its location and energy data to the base station, in order to reduce the energy consumption occurring from broadcasting messages through flooding from LEACH-C. We have verified the LCSPL algorithms capability through an NS2 simulation. The result of this experiment is that the LCSPL algorithm showed similar performance levels in energy consumption, integrated data traffic, and number of surviving nodes against LEACH-C when measured cumulatively, but far better when measured in its totality.

고정이득 L-band EDFA에서 발진 파장 및 방향에 따른 과도응답 특성

김익상,김창봉,양흥,손영호,Kim Ik sang,Kim Chang bong,Yang Heng,Sohn Young ho 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.3a

WDM(Wavelength Division Multiplexing) 광통신망의 노드에서 신호채널들이 분기 결합될 때 잔류채널들의 이득을 일정하게 제어해 주기 위해 고정이득 EDFA를 사용한다. 본 논문에서는 양방향 펌프에 의해 고이득을 가지는 L-band EDFA에서 발진광에 의해 입력변화를 보상해주는 방식으로 고정이득 EDFA를 구현하였다. 여기서 발진방향 및 파장에 따른 잔류채널의 과도응답 특성에 있어서 단파장 후방발진의 경우가 최적임을 확인할 수 있었다. The gain-clamped EDFA has been developed to eliminate the output power change of WDM surviving channels to occur with added or dropped channels, which degrades the performance of WDM optical network. It maintains the constant gain of surviving channels when WDM channels are added or dropped in a network amplifying node. In this paper, the hi-directionally pumped gain-clamped EDFA is implemented to compensate the change of the input power by a lasing. The results show that the lasing of a short wavelength and backward propagation is the optimal condition to minimize the transient response of surviving channels in terms of the overshoot and gain saturation due to the inhomogeneous broadening effect.

시지각력이 이름대기에 미치는 영향

백은진(Eun Jin Paek),손영호(Young-Ho Sohn),김향희(HyangHee Kim) 한국언어청각임상학회 2011 Communication Sciences and Disorders Vol.16 No.1

배경 및 목적: '대면이름대기'는 자극 목표물에 대한 시지각적 사물인식 단계, 의미적 단계, 음운적 산출 단계 등을 거치는 이름대기 능력을 알아볼 수 있는 과제이다. 알츠하이머병 치매에서는 대면이름대기 능력이 유의하게 손상되며, 시각 오류가 흔히 관찰된다. 이에 반해 파킨슨병 치매군의 이름대기 능력 손상에 대해서는 연구자간 의견이 일치하지 않으며, 그 오류 유형에 대해 질적으로 연구된 바가 없다. 이에, 두 치매군의 전반적 인지 수준을 통제한 채 시지각력과 대면이름대기 능력을 측정하고, 시지각력이 대면이름대기에 미치는 영향을 살펴보고자 하였다. 방법: 알츠하이머병 치매군 32명과 파킨슨병 치매군 17명을 대상으로 Motor-free Visual Perception Test-Vertical format (MVPT-V)와 한국판 보스톤 이름 대기 검사를 실시하였다. 대면이름대기 오류 유형은 시각, 의미, 음소, 그 외 오류 등의 4가지로 분류하여 질적으로 분석하였다. 결과: 시지각력은 두 환자군 간에 유의한 차이를 보이지 않았으나 두 군 모두 정상 규준에 비해 저하되어 있었다. 이름대기 검사 결과에 있어 알츠하이머병 치매군이 파킨슨병 치매군보다 낮은 수행력을 보였으나, 오류 유형의 빈도에 있어서는 대부분 두 치매군 간의 차이는 없었다. 또한, 알츠하이머병 치매군의 시지각력이 저하될수록 대면이름대기 상의 시각 오류 빈도가 높아졌다. 논의 및 결론: 알츠하이머병 치매군과 파킨슨병 치매군의 시지각력 손상을 확인하였으며 시지각력이 대면이름대기 수행력과 연관이 있음을 알 수 있었다. 이에 따라, 치매 환자의 시지각력을 면밀히 평가하는 것이 바람직하며, 이름대기 장애 중재 시에는 시각 자극의 지각적 수준을 조절할 필요가 있다고 사료된다. Background & Objectives: Generally, confrontation naming involves the visual-perceptive stage, the semantic stage, and the phonological output stage. Patients with Alzheimer's disease (AD) may exhibit increased errors in the visual-perceptive stage when performing confrontation naming tasks as the disease progresses. On the other hand, the nature of the confrontation naming ability in patients with Parkinson's disease with dementia (PDD) is not fully understood. The purposes of our study were to compare the visual perception and confrontation naming abilities between patients with AD and patients with PDD and to determine if patients with PDD also exhibit visual errors on confrontation naming tasks. We also studied whether the visual perception ability affects confrontation naming performance. Methods: The subjects included 32 patients with AD and 17 patients with PDD. We administered the Motor Free Visual Perception Test—Vertical Format and the Korean version of the Boston Naming Test to all patients. We classified the patients' erroneous naming responses into four types (visual, semantic, phonemic, miscellaneous) in order to qualitatively investigate the naming performances. Results: The visual perception abilities of the two dementia groups were lower than that of normal people, but there was no significant difference between the two dementia groups. Also, the patients with AD showed significantly worse performance on confrontation naming tasks than did the patients with PDD. Furthermore, the two groups were not different in terms of the component ratio of error types. Discussion & Conclusion: We confirmed that the neuropathological changes in the two subtypes of dementia involve visual pathways that analyze the forms and shapes of visual stimuli. In view of the fact that the visual perception scores of the patients with AD had a significant effect on the ratio of visual error, our results support the visual hypothesis that has been proposed in previous studies.

De navo 특발성 파킨슨병 환자의 문단 읽기 과제에서의 호흡 특성

김병미(Kim Byung Me),손영호(Sohn Young Ho),백승재(Baek Seung Jae),이필휴(Lee Phil Hyu),남정모(Nam Chung Mo),이지은(Lee Ji Eun),최예린(Choi Yaelin) 한국음성학회 2011 말소리와 음성과학 Vol.3 No.1

Idiopathic Parkinson's Disease patients' speech is hypokinetic dysarthria and their speech is possibly the consequence of impaired respiratory support. The purpose of this study was focused on the respiratory characteristics of speech breathing in de novo IPD who were not given prior vocal or anti-Parkinson treatment. A total of 40 subjects participated in the study: 20 de novo IPD patients between the ages of 50 and 80, and 20 normal subjects with similar age, height, and weight matches. Forced Expiratory Vital Capacity (PVC), Forced Expiratory Volume in 1 sec (FEVl) and FEVI as a percentage of PVC (FEVI/FVC) was measured with a PC-based spirometer (Cosmed). In addition, Maximum Phonation Time (MPT), Mean Airflow Rate (MFR), Subglottal Pressure (Psub) and the number of syllables produced per breath were measured with a Phonatory Aerodynamic System (Kay PENTAX). All subjects were asked to read a standardized Korean paragraph and the following measurements were obtained from the task. Results indicated no statistically significant differences in respiratory function (FEVI/FVC%) and aerodynamic function between the two groups, but the number of syllables per breath was significantly lower in the IPD patient group than in the normal group and it could be predicted by PVC and MFR. Therefore, the study shows that the MFR from the lungs during speech in de novo IPD patients is used inefficiently.

자동정적시야계에 (自動靜的視野計) 의한 시야검사

홍철(Chul Hong),손영호(Young Ho Sohn) 대한안과학회 1984 대한안과학회지 Vol.25 No.1

다양한 크기의 지도에 대응 가능한 위치 및 거리 감지 GPS신호 변환 알고리즘 구현

정하연 ( Ha Yeon Jung ),손영호 ( Young Ho Sohn ) 한국센서학회 2009 센서학회지 Vol.18 No.1

센서 네트워크에서 LEACH 기반의 효율적인 데이터 전송을 위한 LSPL 알고리즘

정왕부(Wang-Boo Jeong),손영호(Young-Ho Sohn) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.10

Wireless sensor networks (WSN) are currently being applied in various areas. Even though the Sensor is small in size, it has the ability to detect and to process information. However, the sensor is limited in energy retention and processing capabilities. The ability to use energy efficiently for network operation is especially important since the exchanging and recharging of a battery has its limits. Therefore, this paper suggests the LSPL(LEACH Steady-state Phase Looping) algorithm which uses energy more efficiently by reconstructing data transmission on LEACH base. We have verified the LSPL algorithms capability through an NS2 simulation. The result of this research work has shown that the LSPL algorithm is more efficient than the LEACH.