• 대한수학회보
• /
• 제43권4호
• /
• pp.747-753
• /
• 2006

We say operators A, B on Hilbert space satisfy Fuglede-Putnam theorem if AX = X B for some X implies $A^*X=XB^*$. We show that if either (1) A is p-hyponormal and $B^*$ is a class y operator or (2) A is a class y operator and $B^*$ is p-hyponormal, then A, B satisfy Fuglede-Putnam theorem.

• 정보처리학회논문지D
• /
• 제9D권1호
• /
• pp.75-80
• /
• 2002

Putnam은 소프트웨어 프로젝트에 참여하는 인력이 Rayleigh 분포를 따르는 SLIM 모델을 제시하였다. 이 모델에서 인력분포를 얻기 위해서는 총 개발노력과 개발 난이도를 추정해야 한다. 프로젝트 개발에 참여할 것인지 여부를 결정하기 위해서는 소프트웨어 생명주기의 초기단계에서 이 모수들을 보다 적확히 추정하는 것이 필요하다. Putnam은 시스템 속성들 중 강한 상관관계가 있는 변량을 제거하고 나머지 변량들만으로 총 개발노력과 개발 난이도를 추정하였다. 그러나 통계적 방법에 따라 변량들이 다르게 선택되며 모델의 성능에 차이가 발생한다. 본 논문은 Putnam 방법 대신 주성분분석을 이용하여 최적의 시스템 속성을 선택하였다. 모델의 성능분석 결과 주성분분석 방법이 Putnam의 방법보다 9.85% 성능향상을 보였다. 또한, 제안된 모델은 단순하고 쉽게 구현할 수 있다.

• Kyungpook Mathematical Journal
• /
• 제46권4호
• /
• pp.497-502
• /
• 2006

An asymmetric Fuglede-Putnam theorem for $p$-hyponormal operators and class ($\mathcal{Y}$) is proved, as a consequence of this result, we obtain that the range of the generalized derivation induced by the above classes of operators is orthogonal to its kernel.

• 철학연구
• /
• 제120권
• /
• pp.109-130
• /
• 2011

이 논문의 주된 목적은 퍼트남의 새로운 윤리학적 논의를 검토하고, 그가 제안하는 '실용주의적 다원주의'가 자신의 이성주의와의 내적 비정합성을 극복하기 위해서 훨씬 더 적극적으로 자연화되어야 한다는 점을 지적하려는 것이다. 지속적인 입장 변화 속에서 퍼트남의 최근 논의는 윤리학적 탐구로 확장되고 있으며, '존재론 없는 윤리학'이라는 기치를 앞세운 퍼트남의 논의는 명시적으로 실용주의를 향하고 있다. 퍼트남은 보편적 도덕원리에 대한 탐구로 특징지어지는 전통적인 윤리학이 존재론을 가정하고 있다고 지적하며, 그것이 객관성에 대한 요구에서 비롯된다고 본다. 퍼트남의 과제는 존재론에 의지하지 않으면서도 우리가 원하는 객관성을 확립하는 일이며, 그것은 그가 제안하는 '실용주의적 다원주의'로 압축된다. 실용주의적 다원주의는 전통적 객관주의를 거부하면서도 허무주의를 비켜서려는 제3의 입장이다. 퍼트남의 이러한 제안은 그 자체로 옳은 것이지만 자신이 유지하는 이성주의적 미련은 퍼트남의 제안에 내적 정합성 문제를 불러온다. 이 문제를 극복하기 위해서 퍼트남의 철학은 훨씬 더 적극적으로 자연화되어야 하며, 그것은 규범적 이성 개념에 대한 근원적 수정을 요구할 것이다.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제10권4호
• /
• pp.273-277
• /
• 2003

The Fuglede-Putnam Theorem is that if A and B are normal operators and X is an operator such that AX = XB, then $A^{\ast}= X. In this paper, we show that if A is $\omega$-hyponormal and $B^{\ast}$ is invertible $\omega$-hyponormal such that AX = XB for a Hilbert-Schmidt operator X, then $A^{\ast}X = XB^{\ast}$.

• 대한수학회보
• /
• 제35권2호
• /
• pp.319-324
• /
• 1998

The equation AX = BX implies $A^*X\;=\;B^X$ when A and B are normal (Fuglede-Putnam theorem). In this paper, the hypotheses on A and B can be relaxed by usin a Hilbert-Schmidt operator X: Let A be p-quasihyponormal and let $B^*$ be invertible p-quasihyponormal such that AX = XB for a Hilbert-Schmidt operator X and $|||A^*|^{1-p}||{\cdot}|||B^{-1}|^{1-p}||\;{\leq}\;1$.Then $A^*X\;=\;XB^*$.

• East Asian mathematical journal
• /
• 제14권1호
• /
• pp.21-26
• /
• 1998

The Fulgede-Putnam theorem asserts as if A and Bare normal operators and X is an operator such that AX=XB, then A*X=XB*. In this paper, we show that if A is k-quasihyponormal and B* is invertible k-quasihyponormal such that AX=XB for a Hilbert-Schmidt operator X, then A*X=XB*.

• 통상정보연구
• /
• 제11권3호
• /
• pp.363-390
• /
• 2009

This study investigates the role of private participation in FTA Negotiation in case of US, Mexico and Japan. We utilize Putnam(1988)'s two stage negotiation model, Schelling Conjecture and Principal-Agent(P-A) theory to understand the role of private sector in FTA Negotiation. Those theories are useful to understand the behavior and interaction of key players such as private sector, congress and government in FTA negotiation. Putnam(1988)'s two stage negotiation model divides the FTA negotiation process into two processes: the external negotiation with foreign country and domestic negotiation with domestic interest group. Principal-Agent(P-A) theory provides the theoretical foundation of Putnam's two stage negotiation model, which is that principal's interest is not identical to the interest of Agent. We showed that the private sector and congress play an important role in FTA negotiation in United States. In case of Mexico, the private sector and government occupy the dominant position in FTA negotiation. In particular, the cooperation of industry and government has been successfully established via COECE in Mexico. In contrast to these countries, the role of private participation in trade policy is relatively low in Japan and Korea.

• 정보기술과데이타베이스저널
• /
• 제7권2호
• /
• pp.47-59
• /
• 2000

In this paper, we analyze the applicability of a general optimization algorithm to a database optimization problem. The index selection problem Is the problem to choose a set of indexes for a database in a way that the cost to process queries in the given workload is minimized subject to a given storage space restriction for storing indexes. The problem is well known in database research fields, and many optimization and/or heuristic algorithms have been proposed. Our work differs from previous research in that we formalize the problem in the form of non-linear Integer Programming model, and investigate the feasibility and applicability of a general purpose optimization algorithm, called OPBDP, through experiments. We implemented algorithms to generate workload data sets and problem instances for the experiment. The OPBDP algorithm, which is a non-linear 0-1 Integer Programming problem solver based on Davis-Putnam method, worked generally well for our problem formulation. The experiment result showed various performance characteristics depending on the types of decision variables, variable navigation methods and ocher algorithm parameters, and indicates the need of further study on the exploitation of the general purpose optimization techniques for the optimization problems in database area.

• 한국언어정보학회지:언어와정보
• /
• 제8권2호
• /
• pp.113-130
• /
• 2004

In a prevailing view of meaning and reference (cf. Frege 1892), words pick out entities in the physical world by virtue of meaning. Linguists and philosophers have argued whether the meaning of a word is inside or out-side language users' mind; but, in general, they have taken it for granted that words refer to entities in the physical world. Hilary Putnam (1975), based on his famous twin-earth thought experiment, argued that the meaning of a word could not be inside language users' head. In this paper, I point out that Putnam's argument makes sense only if words refer to entities in the physical world. That is, Putnam did not provide any argument against mentalistic semantics, since he erroneously assumed that meaning, but not reference, was inside our mind in mentalistic semantics. Mentalistic semanticist, however, assume that words pick out their references inside our head (instead of a possible outside world). A number of arguments for the mentalistic position come from psychology: studies on emotion and visual perception provide numerous cases where words cannot pick out entities from the physical world, but inside our head. The mentalistic theory has desirable consequences for the philosophy of language in that some classical puzzles of language (e.g. Russell's (1919) well-known puzzle of excluded middle) are explained well in the proposed theory.