수온약층이 존재하는 천해역에서 단기간 음속구조 변화에 따른 음향 신호 전달 변동에 관한 연구

정동영,김시문,변성훈,임용곤,Jeong, Dong-Yeong,Kim, Sea-Moon,Byun, Sung-Hoon,Lim, Yong-Kon 한국음향학회 2015 韓國音響學會誌 Vol.34 No.1

수중음향 전달채널의 임펄스 응답(Channel Impulse Response: CIR)은 음속구조(Sound Speed Profile: SSP)의 영향을 받으며, 채널 임펄스 응답의 변화는 수중음향통신 시스템의 성능에 중요한 영향을 미친다. 음속분포의 변화는 단기간 내에서도 나타날 수 있으며, 수중음향 모뎀 설계 시 반드시 고려되어야 한다. 이 논문은 2013년도에 제주도 동방해역에서 수행된 JACE13에서 취득된 데이터를 기반으로 음선전달 수치해석을 통해 단기간 동안 시간에 따라 변화하는 음속구조가 음향 신호 전달에 미치는 영향을 통계적으로 분석한 결과를 제시한다. 분석결과 송 수신기 수심별로 채널 임펄스 응답의 변화가 다양하게 나타나며, 송 수신기 수심이 깊을수록 음속구조의 변동에 따른 음향신호 전달 양상의 변화는 작아지고, 신호 준위가 높게 나타난다. 이 연구에서의 다양한 거리, 송, 수신기 수심에 따라 얻어진 채널 임펄스 응답 추정 결과는 수온약층에서의 하방굴절로 인한 연속된 해저면 반사와 작은 해저면 반사손실이 장거리 신호 전파에 중요한 요인이 될 수 있음을 보여주며, 시변동성을 갖는 해양환경에서의 수중 음향 통신은 시간에 따라서 성능이 충분히 달라질 수 있다는 것을 보여준다. Underwater acoustic channel impulse responses (CIR) are influenced by sound speed profile (SSP), and the variation of CIR has significant effects on the performance of underwater acoustic communication systems. A significant change of SSP can occur within a short period, which must be considered during the design of underwater acoustic modems. This paper statistically analyzes the effect of the variation of SSP on the long-range acoustic signal propagation in shallow-water with thermocline using numerical modeling based on the data acquired from JACE13 experiment near Jeju island. The analysis result shows that CIR changes variously according to the SSP and the depth of the transmitter and receiver. We also found that when the transmitter and receiver are deeper, the variation of sound wave propagation pattern is smaller and signal level becomes higher. All CIR obtained in this study show that a series of bottom reflections due to downward refraction and small bottom loss in the shallow water with thermocline can be very important factor for long-range signal transmission and the performance of underwater acoustic communication system in time varying ocean environment can be very sensitive to the variation of SSP even for a short period of time.

지방자치단체장의 윤리적 리더십에 미치는 영향요인에 관한 연구

정동영(Jeong, Dong-Yeong),최상한(Choi, Sanghan) 한국지방정부학회 2017 지방정부연구 Vol.21 No.1

본 연구는 최근 지방자치단체장의 윤리적 리더십에 대한 중요성이 강조되는 상황에서 지방자치단체장의 윤리의 식은 행정전반의 윤리적 기준을 형성하는 주요 요인이라는 것에 기초하여 출발하였다. 이를 위해 본 연구는 선행연 구의 검토를 통해 지방자치단체장의 윤리적 리더십에 영향을 주는 요인으로 상사신뢰, 정서적 몰입, 직무성과, 직무만족도, 역할갈등을 설정하였다. 그리고 이러한 요인들의 영향관계를 파악하기 위하여 경상남도 기초자치단체의 공무원을 대상으로 설문조사를 실시하였다. 본 연구를 수행하기 위한 분석방법으로는 SPSS 23.0을 이용하였다. 분석결과, 지방자치단체 구성원들의 상사 신뢰, 정서적 몰입, 직무만족도는 지방자치단체장의 윤리적 리더십에 정 (+)의 영향을 미치는 것으로 나타났다. 그러나 역할갈등은 지방자치단체장의 윤리적 리더십에 부(-)의 영향을 미치는 것으로 나타났다. 그리고 직무성과는 지방자치단체장의 윤리적 리더십에 영향을 미치지 않는 것으로 나타났다. 따라서 지방자치단체장의 윤리적 리더십을 강화하기 위해서는 구성원들의 상사신뢰, 정서적 몰입, 직무만족을 제고할 필요가 있다고 판단된다. 윤리적 리더십을 종속변수로 설정한 것은 선행연구와 차별화되는 것이고, 향후 연구에서 윤리적 리더십의 영향요인에 대한 탐색의 기초자료로 유용하게 활용될 수 있을 것이다. This study initiated on the ground that under the circumstances that ethical leadership is being emphasized, the ethics of mayors is a main factor forming ethical criterion of administration in general. This study selected trust in the leader, affective commitment, organizational performance(job performance, job satisfaction), role conflict as factors affecting ethical leadership This study conducted a survey of public officials of basic local governments in Gyeongsangnam-do Province. As a result of the analysis, trust in the leader, affective commitment, job satisfaction of organizational performance of the members of local governments were seen to have an positive(+) effect on ethical leadership Role conflict was seen to have an negative(-) effect on ethical leadership. And out of organizational performance, job performance was seen to have no effect on ethical leadership of the mayors in Local Governments.

주거 공간에서의 3차원 핸드 제스처 인터페이스에 대한 사용자 요구사항

정동영(Dong Yeong Jeong),김희진(Heejin Kim),한성호(Sung H. Han),이동훈(Donghun Lee) 대한산업공학회 2015 대한산업공학회지 Vol.41 No.5

4D 영화관 의자의 모션 및 햅틱 효과 분류

정동영(Dong Yeong Jeong),한성호(Sung H. Han),최승문(Seungmoon Choi),이민규(Mingyu Lee),강해우(Haewoo Kang),한상윤(Sangyoon Han),이효승(Hyo Seung Lee),윤겨레(Gyeore Yun),이지완(Jiwan Lee),이다진(Dajin Lee) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.5

The aim of this study is to classify the information that motion and haptic effects of 4D cinema seat describe. 4D technology can add physical effects such as motion, vibration, and wind to audiovisual contents, enabling users to have more realistic and immersive experiences. Specifically, it is known that motion and haptic effects can improve an audience’s immersion. The information that motion and haptic effects describe should be explored to systematically design audience-friendly effects. Eight graduate students in the field of user experience or haptics participated in the experiment. They observed what motion and haptic effects of a 4D cinema seat describe and wrote them in a note while watching five 4D films. After watching each 4D film, they had a discussion and classified the effects based on the information the effects describe. The motion and haptic effects were classified into four categories: object movement, camera viewpoint, sound, and circumstances. The classification would be useful to plan systematically user experience studies of 4D effects. The results of this study might also help to provide design insights to the 4D effect designers.

교통약자를 위한 보행자 경험 체계 제안

정동영(Dong Yeong Jeong),곽지영(Jiyoung Kwahk),한성호(Sung H. Han),박주환(Joohwan Park),이민규(Mingyu Lee),장혜지(Hyeji Jang) 대한산업공학회 2017 대한산업공학회지 Vol.43 No.5

블록체인 어플리케이션의 사용자 경험 연구 동향 파악

정동영(Dong Yeong Jeong),한성호(Sung H. Han),곽지영(Jiyoung Kwahk) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

The aim of this study is to suggest research directions for user experience on blockchain technology through literature survey. Blockchain has emerged as a key technology to develop a transparent and decentralized system with functions such as a smart contract and an identity authentication. Numerous studies have been conducted to foster blockchain technology and apply it to real life applications. Most of the studies have been conducted solely to improve technological capability. They have neglected user experience that should be considered in the product development process. We collected 175 blockchain research papers that were published from 125 journals and conferences in nearly three years. Among these collected papers, we found only 24 papers relevant to user experience and they were classified according to their publication year, source, and research type. Although there were still few user experience studies for a blockchain product or service, the number of the studies tends to increase. Finally, we classified these studies into five types according to research types and suggested four future research directions. This paper will be a milestone for a pioneering blockchain user experience researcher.

윤리적 리더십이 직무만족과 직무성과에 미치는 영향:

오재동(Oh, Jae-Dong),정동영(Jeong, Dong-Yeong),최상한(Choi, Sang-Han) 한국지방정부학회 2017 지방정부연구 Vol.21 No.3

윤리적 리더십이란 “개인행위와 대인관계를 통해 규범적으로 적절한 행동을 보이고, 쌍방적 의사소통, 강화, 의사결정을 통해 부하에게도 그러한 행동을 촉진시키는 것”이며, 정부에서는 정부경쟁력 향상과 경제성장을 위해 부패척결과 청렴도 향상을 강조하면서 윤리와 함께 윤리적 리더십을 필요로 하고 있다. 본 연구에서는 지방공무원들을 대상으로 하여 지방자치단체장의 윤리적 리더십과 직무만족, 직무성과 간 관계에서 정서적 몰입의 매개효과를 분석하였다. 분석결과 지방자치단체장의 윤리적 리더십은 직무만족과 직무성과에 직접적인 영향력을 가지지 않지만, 윤리적 리더십과 직무만족, 직무성과 간 관계에서 정서적 몰입이 완전한 매개효과를 가지는 것으로 나타났다. 따라서 지방공무원들의 직무만족과 직무성과를 제고하기 위해 정서적 몰입을 중점적으로 관리할 필요가 있을 것으로 판단된다. This study initiated on the ground that under the circumstances that ethical leadership of the mayors in Local Governments is being emphasized, the ethics of the mayors in Local Governments is a main factor forming ethical criterion of administration in general. Existing researches on leadership focused mainly on traditional leaderships such as transactional leadership, transformational leadership, servant leadership, and researches on ethical leadership of the mayors in Local Governments are now not enough. Therefore, ethical leadership of the mayors in Local Governments need to be verified. To do so, this study, through checking precedent studies, choose ethical leadership of the mayors in Local Governments, affective commitment as factors affecting job satisfaction and job performance, and formulated a hypothesis. As a result of the analysis, ethical leadership of the mayors in Local Governments were seen to have an positive(+) effect on affective commitment. And affective commitment of the members of local governments were seen to have an positive(+) effect on job satisfaction, job performance. But ethical leadership of the mayors in Local Governments was seen to have no effect on job satisfaction, job performance. Affective commitment a full mediating role in the relationship between ethical leadership and job satisfaction, job performance.

보행 약자의 보행 경험을 기반으로 하는 보행 지원 도구 아이디어 개발 방법

장혜지(Hyeji Jang),한성호(Sung H. Han),정동영(Dong Yeong Jeong),김주환(Ju Hwan Kim) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

Walking has many positive effects on daily life. Various products, services, and policies are being proposed to support mobility-challenged as the population of mobility-challenged increases. However, most of the existing solutions only aim to improve walkability. In addition, it is difficult for designers to understand the experience of mobility-challenged. The purpose of this study is to develop a service idea to improve overall walking experience of the visually, aurally and physically challenged based on their inconveniences during walking. The process of this study consists of three stages: experience collection, idea generation, and idea concretization. Focus group interview was used to collect and understand the experience of mobility-challenged, and morphological analysis was used to supplement the experience. Ideas for improving walking experience were derived using the methods such as why-why diagram and SCAMPER. Details of the derived ideas are developed using service description. In each process, the validity of the results was enhanced by the evaluations of target users and expert. A total of 21 walking support service ideas was derived. These ideas could develop into an assistive device for enhancing the walking experience of mobility-challenged. The results of this study suggest the importance of close cooperation between target users and experts. The proposed idea development process is applicable to the process of deriving a service idea for minorities.

지체장애인에게 접근성 정보를 제공하는 모바일 어플리케이션의 평가 및 개선방안

김주환(Ju Hwan Kim),한성호(Sung H. Han),정동영(Dong Yeong Jeong),박준성(Junseong Park) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

Since the smartphone was introduced little more than a decade ago, many people use a smartphone to search for information they need. There are many applications that help to find the right information faster with a better experience than using web browsers. Physically challenged people are required to find accessibility information before they visit any places due to using mobility assistive devices. Even though there are many applications that provide the information for physically challenged users, but most of them have a very small number of active users. In this paper, we have evaluated mobile applications providing accessibility information for physically challenged users. We have researched literature that provides principles and guidelines for various aspects such as usability, emotion, affects, and user experience. We also used Competitive Analysis from the marketing field to compare the applications providing accessibility information with other similar applications such as tour information providing applications and social network service applications. As a result, the usability of the physical attributes of the applications was not much different from the applications to which it was compared to. However, most of them have low-quality in visual design and poorly presenting information. Despite the fact that the most smartphone has screen size too big for one hand interaction, none of them provide functionality to support people with disability in upper limb who has reachability problems. Also, they are lack of providing attractive and interesting factors while using the applications. Due to only focusing on delivering accessibility information they have failed to deliver quality user experiences to physically challenged users.

DUT 및 PHIL 시뮬레이터 스위칭 주파수 비에 따른 PHIL 시뮬레이터 운전 특성

허홍준(Hong-Jun Heo),황선웅(Seon-Woong Hwang),정동영(Dong-Yeong Jeong),김장목(Jang-Mok Kim) 전력전자학회 2020 전력전자학술대회 논문집 Vol.2020 No.8