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    knowledge to evaluate the runner system of its temperature
    distribution and the effect on products. The integrated design
    of multi-cavity plastic injection mold hot-runner has been
    realized by the integration of necessary structure information
    and analysis of the system.
    II.  KU INFORMATIONAL EXPRESSION OF HOT-RUNNER DESIGN
    Definition 1   Knowledge Unit (KU): Knowledge unit is
    the subset of knowledge that describes a specified object or
    event. It illustrates the content, structure features, problem
    description, reasoning rules and solutions of the object or the
    event. KU is the basic element of product design knowledge
    system. It expresses the conceptual information, and
    effectively structuralizes information units of the product. KU
    can be subpided into atom knowledge unit (AKU), gene
    knowledge unit (GKU), and complex knowledge unit (CKU).
    With the concept of ‘attribute’, generalized definition in
    mathematical format can be used for the units to describe
    status, feature, or character of an object or an event, or to
    describe the approaches or process of problem solving.
    Definition 2 Atom Knowledge Unit (AKU): AKU is the
    minimal component of Knowledge Unit, which is used to
    describe the basic state of knowledge existence, i.e., the
    description of the basic knowledge in design, such as property,
    state, characteristic, etc. AKU can be expressed as:
    Assume that A is the set of the name of properties, and a
    represent the property. For each aA, there is a corresponding
    domain D.  The  definition  of AKU can be expressed as the
    following three methods:
    1) a=v, where aA,  VD. In terminology, it means the
    value of  a equals  v, where  V  belongs to the subsets of  D,
    therefore, a=V can be treated as a definition for abstract data
    type.
    2) aV, where aA, VD. In terminology, it means  a
    obtains its value in V.
    3) a = x, where aA,  x is a variable. In terminology, it
    means a equals the value of variable x, and x varies in D.
    Definition 3 Gene KU (GKU): GKU is adopted to
    describe the evaluation of object constitution, target properties
    or any entity, including one or more atom knowledge units
    and other knowledge of the construction. GKU is utilized in
    applications of simple knowledge domain and inference rules
    in the process of design. GKU is expressed as: [fname, (Ka1,
    Ka2, ,Kan)], where fname is the designation, representing a
    GKU, and Kai is AKU, representing the evaluation of property
    of GKU in terminology.
    Definition 4 Complex KU(CKU):  CKU is the
    knowledge units including AKU and GKU, which can
    describe the knowledge domain and inferential methods
    generally.
    Definition 5   Structure Unit (SU): SU is a type of KU
    that communicates conceptual design and structure design,
    and is the structural subset that describes a certain product. It
    contains the information about attribute, status, and feature
    etc. transferred by conceptual design. Corresponding to KU,
    SU can be classified into atom structure unit (ASU), gene
    structure unit (GSU), and complex structure unit (CSU).
    Multi-cavity plastic injection mold can be an example.
    Multi-cavity molds are usually designed for mass production
    to improve efficiency. Each mold has 2 cavities, 3 cavities, 4
    cavities, 6 cavities, … 32 cavities, 48 cavities, 64 cavities or
    even more thus producing several parts with each cycle.
    During the design process of this type of mold, the expression
    based on SU is that: ASU consists of basic conceptual
    information attributes about gate, nozzle, and runner plate
    (which consists of structure, material, dimensions, shape,
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