Sound Source Localization in Median Plane using Artificial Ear

Sangmoon Lee,Sungmok Hwang,Youngjin Park,Youn-sik Park 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

Sound source localization is the method using the measurements of the acoustic signals from microphone arrays in acoustical engineering. This technique has been used broadly in 3-D sound technology, humanoid robot and teleconferencing and so on. For robot industry, their ultimate purpose is to be with human being. This is why the industry is demanding applicable robot’ auditory system in the form of artificial ears like human’ external ear such as ear pinna. It has more benefits to make use of auditory system with ear pinna to humanoid robots for HRI. In this paper, we propose a specific sound source localization method using a pair of artificial ears, each of which consisting of a single ear pinna and two microphones. The feasibility and localization performance of proposed method for speech signal in median plane is shown. Through the experiment in office environment, we confirm that robots with artificial ears can estimate the elevation angle of speech signal just using two microphone output signals.

The Static and Dynamic Growth Patterns of High-Tech Ventures in Korea

Park, Sangmoon,Bae, Zong-Tae 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.2

This study explores on the static and dynamic growth patterns of high-tech ventures in Korea. We developed an integrative framework with target market (local vs. global),product/market maturity (existing vs. emerging), and technological capability (follower vs. pioneer). We also identified seven new ventures strategies as follows: ⅰ) reactive imitation, ⅱ) proactive localization, ⅲ) import substitution, ⅳ) creative imitation, ⅴ) early market-entry, ⅵ) global niche, and ⅶ) global innovation. With five successful Korean new ventures, we found different competitive behaviors and performance among new venture strategic types. This study also observed two different growth patterns: growth through strategic replication and growth through strategic change. It depends on whether they are pursuing similar strategy over time or different strategy within for growth. In addition, we found that creative imitation plays a stepping-stone role in two-step internationalization processes. Although this study is exploratory and needs more empirical studies, it can provide new ventures with meaningful guidelines for growth and internationalization with a dynamic perspective. to examine growth patterns of new ventures from a dynamic perspective.

Cleansed PHAT GCC based Sound Source Localization

Sangmoon Lee,Youngjin Park,Youn-sik Park 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

Sound source localization (SSL) is one of the important techniques used in various engineering fields such as monitoring and surveillance system, and so on. When SSL is utilized in robot auditory system, it is essential for Human-Robot Interaction (HRI) in that robot can recognize its working environment and what direction a speaker is locating. Generalized cross correlation (GCC) function has been frequently used for SSL due to its fast computation and less requirement of high system resources. Artificial ear which is the robot auditory hardware we are dealing with consists of 2 microphones and a single pinna structure. This is locating on the both sides of robot head where free field condition can’t be applicable due to reflected wave caused by robot platform such as robot shoulder, etc. This paper has focused on modification of spatially mapped GCC function, which was proposed by B. Kwon, for application into artificial ear structure. We proposed cleansed PHAT GCC function for use in spatially mapped GCC method. Cleansed PHAT GCC function combines cleansing method and conventional PHAT GCC function for eliminating reflected wave which causes free field condition break down. Simulation results using proposed cleansed PHAT GCC function showed that 93% SSL performance is obtainable when a single sound source exists.

Robust stability analysis for Lur’e systems with interval time-varying delays via Wirtinger-based inequality

Park, Myeongjin,Kwon, Ohmin,Park, Juhyun,Lee, Sangmoon,Cha, Eunjong Springer (Biomed Central Ltd.) 2014 Advances in Difference Equations Vol. No.

국내시장지향 벤처와 해외시장지향 벤처의 특성 비교

박상문(Sangmoon Park) 한국기술혁신학회 2005 기술혁신학회지 Vol.8 No.2

Leader-following Consensus Criteria for Multi-agent Systems with Time-delay and Static Interconnection Topology

Myeongjin Park,Ohmin Kwon,Juhyun Park,Sangmoon Lee 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10

This paper proposes new delay-dependent consensus criteria for multi-agent systems with time-varying delays and static interconnection topology. By constructing a suitable Lyapunov-Krasovskii’s functional and utilizing convexhull properties, new delay-dependent consensus criteria for the systems are established in terms of linear matrix inequalities (LMIs) which can be easily solved by various effective optimization algorithms. One numerical example is given to illustrate the effectiveness of the proposed methods.

Randomly occurring Leader-following Consensus criterion for Multi-agent systems with Communication delay

Myeongjin Park,Ohmin Kwon,Juhyun Park,Sangmoon Lee,Kihoon Kim 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

This paper proposes new delay-dependent leader-following consensus criterion for multi-agent systems with time-varying delays. Specially, the randomly occurring connection information of leader is considered in the concerned system. By constructing a suitable Lyapunov-Krasovskii functional and utilizing reciprocally convex approach, new delay-dependent consensus criterion for the systems are established in terms of linear matrix inequalities (LMIs) which can be easily solved by various effective optimization algorithms. One numerical example is given to illustrate the effectiveness of the proposed method.

내부 R&D투자와 외부 지식탐색 활용 영향요인

박상문(Sangmoon Park) 대한경영학회 2018 大韓經營學會誌 Vol.31 No.3

최근 기업들은 내부 R&D투자와 동시에 외부 지식탐색을 통한 기술경쟁력 확보를 위해 노력하고 있다. 개방형 혁신의 중요성에 따라 외부 지식탐색에 대한 영향요인이나 상황적 특성에 대한 관심이 증가하고 있으나 이에 대한 실증연구는 미흡한 수준이다. 본 연구에서는 국내 중소제조기업에 있어서 내부 R&D투자와 외부지식탐색 활용에 영향을 주는 주요 기업특성요인들을 살펴보았다. 또한 기업내 R&D연구소 보유 여부가 내부 R&D투자와 외부 지식탐색 활용에 미치는 직접적인 효과과 조절효과를 살펴보았다 국내 중소제조기업들에 대한 대규모 설문조사 결과를 바탕으로 본 연구가설들을 검정하였다. 기업들의 기술선도전략은 내부 R&D투자와 외부지식탐색에 정(+)의 유의한 영향을 미치는 것으로 나타났다. 국내최초전략을 추구하는 경우에는 내부 R&D투자와 외부지식탐색 모두 증가하는 것으로 나타났다. 반면 세계최초전략을 추구하는 경우에는 내부 R&D투자만 증가하는 것으로 나타났다. 기술역량이 높을수록 내부 R&D투자와 외부지식탐색 모두 정(+)의 영향을 갖는 것으로 나타났다. R&D 연구소를 보유한 경우에는 내부 R&D투자는 유의하게 확대하는 것으로 나타났으나 외부지식탐색에는 유의한 영향관계가 나타나지 않았다. 연구소를 보유하고 기술역량이 높은 경우에는 내부 R&D투자와 정(+)의 영향관계가 나타났다. 반면, 연구소를 보유하고 기술역량이 높은 경우에는 외부지식탐색에 부(-)의 영향관계가 나타났다. 본 연구의 주요 연구결과와 시사점은 다음과 같다. 보편적인 기술보다는 최초기술을 개발하고자 하는 기업들은 내외부적으로 적극적인 지식창출을 추구하는 것으로 나타나고 있다. 그러나, 세계 최초 기술개발을 추구하는 경우에는 외부 기술이나 지식유출 우려는 외부지식탐색을 저해하는 요인으로 작용할 수 있다. 국내 중소제조기업들의 R&D연구소는 내부 기술개발 기능에는 충실하나 외부 지식탐색 기능은 미흡한 것으로 나타나고 있어 제한적인 역할에 그치고 있다. 연구소 보유하고 내부 기술역량 수준이 높을 경우에는 연구소 조직에 대한 정당성과 경영진 관심으로 인해 내부 R&D투자를 확대하는 것으로 나타났다. 반면, 연구소를 보유하고 내부기술역량 수준이 높은 경우에는 NIH 현상이나 외부 기술의존에 따른 연구소 존재와 역할에 대한 정당성 확보와 자원확보의 어려움으로 외부지식탐색을 저해하는 것으로 나타났다. Technological innovation is important for firms to seize new business opportunities and strengthens technology competitiveness in existing product markets. According to widespread of open innovation, prior studies focused on the effects of external knowledge search activities on performance with many country contexts. Recently there has been a growing interest in key factors to increase external knowledge search activities with limited empirical studies. There is little studies on how firm characteristics have impact both on internal R&D investment and external knowledge search activities. Also there are little understanding on the dual roles of R&D center for internal R&D development and external knowledge search. This study examined the relationship of firm characteristics-technological pioneering strategy, technological capability and the existence of R&D center with internal R&D investment and external knowledge search. In addition, this paper investigated the interacting effects of R&D center and technological capability on internal R&D investment and external knowledge search. Based on the results of a large scale survey on Korean manufacturing SMEs, this paper tested key hypotheses. Technology pioneering strategy has a positive effect on internal R&D investment and external knowledge search. Firms to pursue first-to-local market strategy increase both internal R&D investment and external knowledge search. Firms to pursue first-to-global market only increase internal R&D investment. The higher the technological capability, the more positive the internal R&D investment and the external knowledge search. When firms have own R&D centers, they significantly increase intern R&D investment but have no significant relationshjps with external knowledge search. There are a positive interaction effects of R&D center and technological capability on internal R&D investment. In contrast to the hypothesis, there is a negative interaction effects of R&D center and technological capability on external knowledge search activities. The main findings of this study and implications are as follows. There are differences in knowledge creation methods according to the technology strategy. Firms to develop first-to-market technology rather than general technology are actively seeking to create knowledge both inside and outside. In the process of external cooperation for the world s first technology development, it can act as an obstacle to search of external knowledge due to possibility of leakage of information or knowledge on new technology and innovations. Independent R&D center operations have a different impact on internal or external knowledge acquisition. It seems that the main functional role of the R&D center in Korean manufacturing SMEs focuses on the internal R&D development rather than external knowledge searches. It has little roles to access diverse information sources and create innovations. The interaction effect between the R&D center and the internal knowledge capability shows different results in internal R&D investment and external knowledge search. The R&D center with a high level of internal technology capability has a positive influence on internal R&D investment. This is because the securing of the technological capability through R&D center earns organizational legitimacy and top managers attention to allocate more resources. On the other hand, the interaction effect between internal technology capability level and R&D center has a negative effect on external knowledge search. This may be due to resistance to external knowledge and technology by the R&D centers not-invented here (NIH) syndrome. It is also possible for R&D center to intentionally lower the use of external technologies when top managers have intents to reduce their internal R&D investment for internal R&D center t

이전 창업경험 특성이 벤처기업의 외부 자원 확보와 성과에 미치는 영향

박상문(Sangmoon Park),이미순(Mee Soon Lee) 한국경영학회 2017 한국경영학회 통합학술발표논문집 Vol.2017 No.08

본 연구에서는 창업자의 이전 창업경험 특성이 벤처기업의 외부자원 확보와 성과에 미치는 영향에 대해 연구하고자 한다. 창업자의 이전 창업에 따른 성공과 실패의 경험은 후속 창업시 벤처기업의 운영과 성과에 중요한 영향을 미치는 것으로 논의되고 있다. 창업자의 이전 창업경험이 실제 새로운 벤처기업의 운영과 성과에 미치는 실증적 연구결과들은 일관된 결과들을 보여주지 못하고 있다. 본 연구에서는 국내 벤처기업들을 대상으로 창업자의 이전 창업경험 특성이 벤처기업의 자원조달과 성과에 미치는 영향에 대해 실증적으로 살펴보고자 한다. 이전 창업경험은 외부 자원조달에 정의 영향을 미치는 것으로 나타난 반면 성과에는 유의한 영향관계를 보이지 않았다. 이전 창업경험의 세부적 특성별로 살펴보면, 이전 성공경험은 외부자원조달에만 정의 영향을 미치며, 이전 실패경험은 성과에만 부의 영향을 미치는 것으로 나타났다. 최근 증가하고 있는 연쇄창업자에 대한 관심이나 실패재기 지원과 같은 창업자의 이전 창업경험에 대한 이론적이고 실무적 시사점을 제시하고자 한다. This paper investigates the effects of prior experience on external resource acquisition and performance. Prior experience has significant impacts on the early development process of new ventures founded by experienced entrepreneurs. There are inconclusive results on the relationships between prior founding experience and key activities and performance of new ventures. Based on the data of Korean new ventures. this paper empirically analyze these relationships of prior experience with external resource acquisition and performance. Prior experience has positive effects on external resource acquisition. Success prior experience is important for external resource acquisition. Prior experience has no significants effects on performance. For job creation, success experience has positive effects and failure experience shows negative effects. Only failure experience has negative effects on sales performance. Finally this paper suggests theoretical and practical implications of prior experience of new ventures.

자원제약이 중소기업의 기술혁신에 미치는 영향

박상문(Sangmoon Park) 한국경영학회 2016 한국경영학회 통합학술발표논문집 Vol.2016 No.8

중소기업에 있어 기술혁신은 경쟁력의 원천이면서 지속적인 성장과 중요한 요인이다. 기술혁신의 중요성에도 불구하고 중소기업들은 여러 자원제약으로 인해 기술혁신과 이의 사업화를 원활하게 추진하지 못하고 있는 것도 현실이다. 선행연구들에서 자원제약이 기술혁신에 미치는 영향은 상반된 결과들을 보여주고 있다. 자원제약으로 인해 우수한 아이디어의 기술개발이나 기술혁신을 어렵게 한다는 입장에 대한 주장이 존재한다. 반면, 자원제약에도 불구하고 이러한 제약요건을 극복하기 위한 창의적 접근이나 문제해결과정을 통해 오히려 자원제약이 기술혁신을 촉진한다는 상반된 입장을 제시하고 있다. 본 연구에서는 국내 중소제조업을 대상으로 자원제약이 기술혁신에 미치는 영향에 대한 실증연구 결과를 제시하고자 한다. 이를 위해 기술혁신활동조사 자료를 활용하여 중소기업들의 자원제약 수준과 기술혁신의 결과간의 관계에 대한 실증분석을 실시하였다. 분석결과, 국내 중소제조업들의 경우 자금제약은 기술혁신 성과를 촉진하는 것으로 나타나고 있는 반면, 지식제약의 경우에는 기술혁신 성과에 유의한 영향을 미치지 않는 것으로 나타났다. 본 연구를 통해 국내 중소제조업에서의 기술혁신 촉진을 위한 방안들에 대한 이론적 시사점과 정책적 의의를 제시하고자 한다. This paper examines the effects of resource constraints and radical innovation performances in Korean Manufacturing SMEs. Prior studies have shown inconclusive results on the relationships of resource constraints with innovation performances. Based on 2010 Koran Innovation survey, it empirically investigates how resource constraints measured by financial constraints and knowledge constraints affect radical innovation performances. Financial constraints have positively significant effects on radical innovation performances. Knowledge constraints, however, are not found any significant effects on innovation performances. Finally this paper suggests some implications and policy recommendations to accelerate radical innovations.