13 results on '"Kim, Jinwoo"'
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2. Optimal collusion-proof auctions
- Author
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Che, Yeon-Koo and Kim, Jinwoo
- Subjects
Business ,Economics - Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jet.2008.07.004 Byline: Yeon-Koo Che (a), Jinwoo Kim (b) Keywords: Collusion on participation; Subgroup collusion; Multiple bidding cartels; An exclusion principle Abstract: We study an optimal collusion-proof auction in an environment where subsets of bidders may collude not just on their bids but also on their participation. Despite their ability to collude on participation, informational asymmetry facing the potential colluders can be exploited significantly to weaken their collusive power. The second-best auction -- i.e., the optimal auction in a collusion-free environment -- can be made collusion-proof, if at least one bidder is not collusive, or there are multiple bidding cartels, or the second-best outcome involves a non-trivial probability of the object not being sold. Regardless, optimal collusion-proof auction prescribes non-trivial exclusion of collusive bidders, i.e., a refusal to sell to any collusive bidder with positive probability. Author Affiliation: (a) Columbia University, Economics Department, 420 West 118th Street, New York, United States (b) Yonsei University, School of Economics, Republic of Korea Article History: Received 6 September 2007; Revised 11 June 2008; Accepted 22 July 2008
- Published
- 2009
3. The value of an informed bidder in common value auctions
- Author
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Kim, Jinwoo
- Subjects
Auctions ,Business ,Economics - Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jet.2008.01.001 Byline: Jinwoo Kim Keywords: Common value; First-price auction; Informed bidder Abstract: I compare two information structures in a common value first-price auction with two bidders: In one, each of the two bidders knows only his own signal about the value of the object, and in the other, one of the bidders learns his opponent's signal as well. Gaining the additional information in the second information structure makes the informed bidder worse off if the value is submodular in the bidders' signals and better off if it is supermodular. If the value is supermodular, then the seller's revenue tends to be lower with the informed bidder than without. Author Affiliation: School of Economics, Yonsei University, Seoul 120-749, Republic of Korea Article History: Received 30 November 2006; Revised 6 November 2007; Accepted 3 January 2008
- Published
- 2008
4. Design-oriented new product development: LG Electronics' Chocolate Phone illustrates what it takes to be successful
- Author
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Jang, Seongkeun, Yoon, Yongki, Lee, Inseong, and Kim, Jinwoo
- Subjects
LG Electronics Inc. -- Achievements and awards -- Management ,Consumer electronics industry -- Achievements and awards ,Product development ,Electronics industry -- Achievements and awards ,Business, general ,Business ,Engineering and manufacturing industries ,Consumer electronics industry ,Company business management ,Time to market ,Electronics industry ,Management ,Achievements and awards - Abstract
OVERVIEW: There are two approaches to reflecting a customer's point of view in new product development (NPD). One is a customer-following approach that utilizes expressed consumer needs. The other is a customer-leading approach that focuses on consumers' latent needs. Currently, the number of customer-leading approaches is increasing rapidly through design-oriented NPD. This case study of LG Electronics' Chocolate Phone reveals a market-oriented frame of mind. From a design point of view, it is important to select talented designers and combine them with market insight and communication skills. From a development perspective, strong technological capabilities, optimization of design functions, and strong managerial support are all central to success. From a marketing point of view, key factors include finding outside marketing professionals and gathering ideas from the outside. Finally, .from an organizational perspective, it is important to share the design concept among related departments and to change engineering-oriented thinking to a market-oriented frame of mind. KEY CONCEPTS: design, new product development, key success factors, customer-following, customer-leading., Attaching high value to outward appearance is pervasive in Korean society. New words such as Ullzzang (good looking faces) and Momzzang (hot bodies) are being coined continuously, and the societal [...]
- Published
- 2009
5. Non-Uniform Constellations for ATSC 3.0
- Author
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Nabil Loghin, Kim Jinwoo, Belkacem Mouhouche, Sung-Ik Park, Daniel Ansorregui, and Jan Zollner
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business.industry ,020206 networking & telecommunications ,02 engineering and technology ,Broadcasting ,QAM ,020210 optoelectronics & photonics ,Signal-to-noise ratio ,Modulation (music) ,0202 electrical engineering, electronic engineering, information engineering ,Media Technology ,Electronic engineering ,Forward error correction ,Electrical and Electronic Engineering ,business ,Quadrature amplitude modulation ,Constellation ,Mathematics - Abstract
This paper introduces the concept of a non-uniform constellation (NUC) in contrast to conventional uniform quadrature-amplitude modulation (QAM) constellations. Such constellations provide additional shaping gain, which allows reception at lower signal-to-noise ratios. ATSC3.0 will be the first major broadcasting standard, which completely uses NUCs due to their outstanding properties. We will consider different kinds of NUCs and describe their performance: 2-D NUCs provide more shaping gain at the cost of higher demapping complexity, while 1-D NUCs allow low-complexity demapping at slightly lower shaping gains. These NUCs are well suited for very large constellations sizes, such as 1k and 4k QAM.
- Published
- 2016
6. Low-Density Parity-Check Codes for ATSC 3.0
- Author
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Yuji Shinohara, Kim Jinwoo, Seho Myung, Shin Jongwoong, Sung-Ik Park, Kyung-Joong Kim, Makiko Kan, and Jae-Young Lee
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business.industry ,Computer science ,Physical layer ,020302 automobile design & engineering ,020206 networking & telecommunications ,Data_CODINGANDINFORMATIONTHEORY ,02 engineering and technology ,Broadcasting ,0203 mechanical engineering ,Encoding (memory) ,0202 electrical engineering, electronic engineering, information engineering ,Media Technology ,Turbo code ,Electronic engineering ,Forward error correction ,Electrical and Electronic Engineering ,Low-density parity-check code ,business ,Error detection and correction ,Algorithm ,Communication channel - Abstract
In this paper, we introduce the overview and detailed structure of low-density parity-check (LDPC) codes, which are adopted for the physical layer standard of Advanced Television Systems Committee (ATSC) 3.0. As one of the features to mitigate channel errors efficiently, LDPC codes are used as a main part of forward error correction scheme within the bit interleaved coded modulation chain. This paper presents two different structures of LDPC codes in the ATSC 3.0 standard: 1) irregular repeat accumulate structure and 2) multi-edge type structure. After the detailed encoding methods for the two structures are introduced, the performance results including comparison studies with other broadcasting standards such as DVB-T2 and DVB-S2 are shown.
- Published
- 2016
7. Flexible and Robust Transmission for Physical Layer Signaling of ATSC 3.0
- Author
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Seho Myung, Sunhyoung Kwon, Kim Jinwoo, Kyung-Joong Kim, Sang-Hyo Kim, Sung-Ik Park, Shin Jongwoong, Yijun Shi, and Hong-Sil Jeong
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Engineering ,business.industry ,Physical layer ,020206 networking & telecommunications ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,QAM ,Broadcast television systems ,Robustness (computer science) ,0103 physical sciences ,Digital Video Broadcasting ,0202 electrical engineering, electronic engineering, information engineering ,Media Technology ,Electronic engineering ,Digital broadcasting ,Digital television ,Electrical and Electronic Engineering ,business - Abstract
The physical layer [layer-1 (L1)] signaling (L1 signaling) of Advanced Television Systems Committee (ATSC) 3.0 is studied. In the new digital broadcasting system, ATSC 3.0, L1 signaling is designed to be more efficient but still robust compared with preceding standards such as DVB-T2. We introduce the error protection scheme of ATSC 3.0 in detail. Especially advanced methods newly employed in ATSC 3.0 are investigated with regard to its purpose and benefit in comparison to conventional DVB-T2.
- Published
- 2016
8. Bidding with securities: comment
- Author
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Che, Yeon-Koo and Kim, Jinwoo
- Subjects
Revenue -- Forecasts and trends ,Auctions -- Research ,Letting of contracts -- Research ,Market trend/market analysis ,Business ,Economics - Abstract
Peter DeMarzo, Ilan Kremer, and Andrzej Skrzypacz (2005) analyzed auctions in which bidders compete in securities. They show that a steeper security leads to a higher expected revenue for the seller, and also use this to establish the revenue ranking between standard auctions. In this comment, we obtain the opposite results to DKS's by assuming that a higher return requires a higher investment cost. Given this latter assumption, steeper securities are more vulnerable to adverse selection, and may yield lower expected revenue, than flatter ones. (JEL D44 )
- Published
- 2010
9. Robustly collusion-proof implementation
- Author
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Che, Yeon-Koo and Kim, Jinwoo
- Subjects
Logistics -- Management ,Industrial project management -- Planning ,Project management -- Planning ,Contracts -- Management ,Contracts -- Methods ,Company business management ,Company business planning ,Business ,Economics ,Mathematics - Abstract
A contract with multiple agents may be susceptible to collusion. We show that agents' collusion imposes no cost in a large class of circumstances with risk neutral agents, including both uncorrelated and correlated types. In those circumstances, any payoff the principal can attain in the absence of collusion, including the second-best level, can be attained in the presence of collusion in a way robust to many aspects of collusion behavior. The collusion-proof implementation generalizes to a setting in which only a subset of agents may collude, provided that noncollusive agents' incentives can be protected via an ex post incentive compatible and ex post individually rational mechanism. Our collusion-proof implementation also sheds light on the extent to which hierarchical delegation of contracts can optimally respond to collusion.
- Published
- 2006
10. Beyond the Individual: The Contextual Wheel of Practice as a Research Framework for Sustainable HCI
- Author
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Mads Schaarup Andersen, Nervo Verdezoto, Mia Kruse Rasmussen, Robert S. Brewer, Johanne Mose Entwistle, Begole, Bo, and Kim , Jinwoo
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Knowledge management ,Computer science ,business.industry ,sustainable HCI ,Energy (esotericism) ,design ,collaboration ,Effective interventions ,Conceptual framework ,Orientation (mental) ,Sustainability ,Health care ,business ,practice-orientation ,energy - Abstract
Addressing human impact on the environment by focusing on shared everyday practices, rather than just individual behavior is an approach that shows promise. However, it can be challenging to put this approach into concrete use, especially in teams unfamiliar with the practice orientation. To support the practice approach, we introduce the Contextual Wheel of Practice (COWOP), a framework that can: 1) help researchers and designers to better understand practices, 2) design effective interventions, and 3) facilitate collaboration between team members from different disciplines, who may not be familiar with the practice orientation. We describe how COWOP was developed, and our experiences using COWOP in three different cases. We then position COWOP as part of the "turn to practice" in HCI, and discuss how it can be useful to HCI researchers and be applied in domains beyond sustainability, such as healthcare and privacy.
- Published
- 2015
11. What to study in HCI?
- Author
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Susanne Bødker, Kasper Hornbæk, Antti Oulasvirta, Stuart Reeves, Begole, Bo, and Kim, Jinwoo
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ta113 ,Knowledge management ,Research questions ,business.industry ,Methodology ,Engineering ethics ,Subject (documents) ,Sociology ,business ,ComputingMilieux_MISCELLANEOUS - Abstract
The question "What to Study in HCI" has two parts. First it asks how HCI researchers think about the research challenges they tackle: how do they decide what problems to engage with and how to study them? Second, the question also asks what is the subject of HCI: which challenges should researchers address and, ultimately, what makes us unique as a discipline? While there have been intermittent discussions on this topic in HCI, the present workshop emphasizes this question and explore some possible answers among a group of seasoned researchers. One reason is our belief that researchers can benefit from addressing these questions so as to develop their practical understanding (e.g., "tricks of the trade") of how to tackle the complexity of selecting "what to study". Second, we argue that researchers can benefit from thinking about the epistemological grounds upon which they base their everyday work, that is, thinking about what HCI is. The workshop results in publicly available key readings and position papers on "What to Study in HCI".
- Published
- 2015
12. BaseLase:An Interactive Focus + Context Laser Floor
- Author
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Constantin Schmidt, Dieter Eberle, Jörg Müller, Begole, Bo, and Kim, Jinwoo
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Focus (computing) ,Computer science ,Parabolic reflector ,business.industry ,InformationSystems_INFORMATIONINTERFACESANDPRESENTATION(e.g.,HCI) ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Curved mirror ,Context (language use) ,Laser ,law.invention ,Laser projector ,law ,Computer vision ,Artificial intelligence ,business ,Projection (set theory) ,Beam divergence ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
We present BaseLase, an interactive laser projected focus + context floor display. In order to provide a transportable system that works in areas where there are no ceilings, we provide an integrated unit (1.3m height) that stands on the floor. One unsolved challenge for laser projectors is to cover large projection areas while providing high resolution at the same time. Our focus + context laser projector solves this problem. BaseLase can cover a large context area in low resolution, while providing three movable high-resolution focus spots. We provide a convex mirror design that enables the laser to reach a large area (75m2) with low resolution while decreasing the beam divergence compared to spherical or parabolic mirrors. This hyperboloidal mirror shape approximately equalizes the point size on the floor independent from the projected location. We propose to add a number of planar mirrors on pan-tilt units to create dynamic zones of high resolution that can adjust to the user behavior. We provide example applications for BaseLase and report on user experience in preliminary trials.
- Published
- 2015
13. Participation in Design between Public Sector and Local Communities
- Author
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Pär-Ola Zander, Susanne Bødker, Begole, Bo, and Kim, Jinwoo
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E-Government ,Web 2.0 ,business.industry ,media_common.quotation_subject ,municipalities ,Public sector ,Citizen journalism ,Public relations ,Space (commercial competition) ,Democracy ,Management ,Work (electrical) ,Political science ,Participatory design ,business ,e-government ,media_common - Abstract
This paper discusses three cases where design was carried out at the intersection between public sector and citizen communities. Based on three dominant traditions meeting there--public (municipal) decision-making, Web 2.0 and participatory design--we identify challenges and solutions regarding participation and engagement of municipal workers and citizens. While this intersection is exactly where a new form of democratic participation could develop, the three traditions were, nonetheless, far from easily combined in the specific cases. The challenges that we have identified are to: Identify win-win situations, rather than to maximize participation; to work with motivation for long-term projects across municipality and communities; to identify and work with early movers, and not just representative citizens; and to create space for local municipal agencies to develop bottom-up technological solutions. The multiplicity of co-existing traditions of involvement need more focus in the future development of participatory design.
- Published
- 2015
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