Suk-Gwon Chang

Assessing the contribution of knowledge to business performance: the KP 3 methodology

Knowledge is inherently difficult to measure. However, without valid and reliable measurement, it is very difficult to develop a comprehensive theory of knowledge and provide a practical guide for knowledge management. In this paper, we do not measure knowledge directly, but assess how much knowledge contributes to business performance. The KP3 methodology developed in this paper assesses the contribution of knowledge to business performance by employing product and process as intermediaries between the two. The understanding of the contribution is essential because it makes it possible to assess the productivities of knowledge entities, evaluate and compensate knowledge workers, and to allocate and develop human capital.

Lower Bounding Procedures for Multiperiod Telecommunications Network Expansion Problems

This paper suggests an improved formulation for the multiperiod network topology and capacity expansion problem and proposes new lower bounding schemes based on it. It differs from earlier formulations and solution methods in that entirely new and different subproblems are solved and a number of lower bound tightening schemes are added within the framework of a Lagrangian relaxation. Dual ascent and multiplier adjustment procedures are suggested for the Lagrange multiplier updating procedure. Computational results are reported to demonstrate the tightness of the bounds generated by the suggested procedures. Heuristics based on converting the dual information obtained from the Lagrangian procedure into primal feasible solutions are tested. The tests show that the Lagrangian-based heuristics generate solutions superior to solutions generated by other heuristics proposed in the literature.

Valuation of knowledge: a business performance-oriented methodology

For the successful management of knowledge, knowledge needs to be measured. Without valid measurement, it is hard to manage it effectively. However, the intangible characteristic of knowledge makes knowledge measurement very challenging. In this paper, we do not measure knowledge directly, but assess how much knowledge contributes to the business performance. KP/sup 3/ methodology developed in this paper assesses the contribution of knowledge to business performance by employing product and process as intermediaries between the two.

Fair integration of routing and flow control in communication networks

Relationships among delay, throughput, and fairness, three conflicting performance criteria in modern flow-controlled communication networks, are investigated, and an optimal tradeoff among them is defined. Several fair bandwidth sharing schemes are introduced and compared with each other for a variety of network configurations. The results obtained are then utilized to define an optimal operating point (OOP) which maximizes the generalized network power. Given a fixed routing, it is shown that the OOP can be found via any unconstrained optimization algorithm. If rerouting is allowed, it is also shown that the OOP can be found by solving a variant of the multicommodity convex cost network flow problem. An algorithm for this problem is developed and tested for a number of networks. A delay-directive flow control scheme is suggested to realize the OOP in real operating networks, and additional implementation issues are discussed. >

Korean telecommunication industry in transition

This paper, as a preface to this special issue, gives an overview of recent developments in Korean telecommunication market and industry. It provides background information that is helpful for understanding the motivations behind research papers contained in this issue. In particular, we discuss the transition of the market structure from monopoly to deregulated competition, the activities in telecommunications R&D, and the building of nationwide telecommunication infrastructure in Korea. A taxonomy of the papers presented in this issue is given at the end.

Incentives for strategic vertical alliances in online information product markets

The online information product market is characterized by the real-time network delivery of digital information products. In this market, the NP (Network Provider) interacts with the CP (Content Provider) in the way that the information product demand is significantly affected by the quality of network delivery. This paper considers a differentiated information product market, where two dominant CP and NP compete or collude on the short run (SR) price levels and on the long run (LR) quality investment and analyzes their market dynamics as a two-stage quality-price game. An intermediate level of vertical alliances, the LR alliance/SR competition, is analyzed to investigate the presence of an incentive to set a LR quality alliance while maintaining independent ownership. We show that the strategic vertical alliance incentives for the CP and the NP vary depending on their relative market power. By analyzing the effect of the advances in broadband access and compression technologies on the market dynamics, we also show that their vertical relations give different incentives for the development of new broadband information product markets.

Caching Strategy and Service Policy Optimization in a Cache-Satellite Distribution Service

This paper introduces the caching strategy and service policy optimization problem in a cache-satellite distribution service and formulates it as a mathematical optimization problem. A number of system performances like hit rate, cache disk space, bandwidth gain, bandwidth requirements for the satellite channel and latency experienced by the clients were modeled into a mathematical formulation. To show how the optimal caching and service policy responds to the system parameter changes, computational experiments were performed on a hypothetical market having forty ISPs and one billion Web documents. It was found that the correlation between document size and popularity is most influential and the concentration of popularity appeared to be the main factor determining the sensitivity of the optimal caching levels and the corresponding system performances like hit rate and byte hit rate. The achieved hit rate ranged between 64 and 74% with the corresponding caching levels of 25 to 40%. Based on these findings, the importance of caching strategy and service policy optimization was discussed and a number of further research issues were suggested.

A new framework for designing business models in digital ecosystem

In this paper, we develop a new framework for designing business models that facilitate to explore new business opportunities in digital ecosystem. We analyze the key growth drivers of healthy digital ecosystem. The key drivers lead us to develop a new framework of the business model: offering focus and customer focus. We implement the proposed business model framework for identifying the growth opportunities in portal, telematics, and mobile finance industry. We also present a hierarchical business model framework for identifying new digital convergence areas.