I n t h e rectenna a r r a y used f o r r e c t i f ic a t i o n of t h e microwaves received on t h e ground i n t h e s o l a r power s a t e l l i t e system, i t i s required t h a t t h e rectenna elements have a high dc power conversion e f f i c i e n c y and t h a t t h e element spacing i s optimized so t h a t t h e a r r i v i n g microwave power i s received e f f i c i e n t l y and t h e number of e l ements can be reduced.I n t h i s paper, a microwave r e c t i f i e r is f a b r i c a t e d i n an i n t egrated form w i t h a m i c r o s t r i p l i n e on a t e flon s u b s t r a t e . A c i r c u l a r m i c r o s t r i p patch antenna i s used. A high r e c t i f i c a t i o n e f f iciency, 66.7 percent i s obtained a t a microwave input of 750 mW and 75.7 percent f o r input of 500 mW. With t h i s rectenna element, a 7 x 7 l a t t i c e a r r a y i s formed and t h e v a r i a t i o n of t h e r e c e i v i n g e f f i c i e n c y ( t h e r a t i o of t h e power converted t o d c t o t h e i n p u t microwave power) i s measured by varying t h e element spacing. On t h e o t h e r hand, t h e r e c e i v i n g e f f i c i e n c y i s c a l c u l a t e d f o r a given element spacing of t h i s rectenna a r r a y from t h e c i rc u i t equation of t h e antenna system by der i v i n g t h e mutual coupling between t h e elem e n t s . The r e l a t i o n s h i p between t h e element spacing of a f i n i t e a r r a y and t h e r e c e i v i n g e f f i c i e n c y i s obtained both experimentally and t h e o r e t i c a l l y . This computation method i s extended t o t h e c a s e w i t h many elements so t h a t t h e change of t h e r e c e i v i n g e f f iciency i s i n v e s t i g a t e d . 1. I n t r o d u c t i o n The s o l a r power s a t e l l i t e (SPS) i s a system i n which s o l a r power generation i s c a r r i e d out on a spsce s t a t i o n and i t s power i s t r a n s m i t t e d t o t h e ground a f t e r being 88 converted t o a microwave a t 2.45 GHz. The rectenna a r r a y i s used t o r e c e i v e t h i s microwave on t h e ground and t o convert t o t h e dc power. The rectenna (receiving and r e c t i f i e r antenna) i s a device c o n s i s t i n g of an antenna t o r e c e i v e t h e microwave and a r e c t i f i e r c i r c u i t t o convert t h e received microwave t o dc power. The rectenna a r r a y i s required t o have a c a p a b i l i t y t o c o l l e c t t h e i n c i d e n t microwave power without l o s s (capture e f f i c i e n c y ) and t h e one t o convert t h e received microwave t o t h e dc power without l o s s (transmission e f f i c i e n c y from t h e antenna t o t h e r e c t i f i e r and r e c t i f i c a t i o n e f f i c i e n c y ) . Since t h e microwave from t h e space illuminates an a r e a of about 100 km2, the number of rectenna elements is enormous. For t h e c o s t reduction, t h e element spacing must be made a s l a r g e a s p o s s i b l e t o reduce t h e number. The purpose of t h i s research i s t o f a b r...

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In order to improve the efficiency of any business, it is now very important to reuse knowledge by accumulating it in a computer. We propose a method that accumulates and reuses knowledge of work by automatically extracting it from a user's operation records during ordinary use on a Personal Information Management system (PIM). We assume that related work events on the PIM are input and referred to consecutively by the user. Our method that extracts available knowledge constructs a workflow by grouping all related events and detecting milestones based on the time and order of operating target events. Usually, reference to events is the user's viewing of events on the calendar without involving operations, so recording a target event and time of reference is difficult. In order to record the user's reference behavior exactly, we introduce a balloon-help-based function for event reference support.

In businesses, knowledge of work is represented by a sequence of related work events and management of these relations is very important for users. This paper proposes a method that automatically groups related work events from user's operation record on a Personal Information Management system(PIM). We assume that the related work events on a PIM are operated consecutively by a user. Our method accumulates the target event and time of the user's operations such as inputs, changes, and references, and picks out all related events based on their recorded operation time. However, reference to events is an act that a user just looks at an event on a calendar view, not involving any operation, so recording which event and what time the user referred is difficult. In order to record the user's reference behavior exactly, we introduce a balloon-help-based function for event reference support. We ran a one-month trial of our developing prototype and confirmed our method can group related work events with acceptable accuracy.

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