Cutter Location Research Articles

РАЗРАБОТКА МОДИФИЦИРАВАННЫХ МЕТОДОВ И МОДЕЛЕЙ ПОИСКОВОЙ АДАПТАЦИИ ДЛЯ РЕШЕНИЯ ЗАДАЧИ ПЛАНИРОВАНИЯ СБИС

In this work, to solve the VLSI planning problem, a search algorithm has been developedbased on a modified ant colony method. The task of forming a VLSI plan is reduced to the task offorming the corresponding Polish expression. The developed method for the synthesis of the Polishexpression includes the construction of a tree of cuts, the choice of the types of cuts (H or V), identificationand orientation of modules. The evolving population is split into pairs of agents. Eachmember of the population is a pair of agents working together. In this case, the constructive algorithmsA1 and A2 used by the agents of the pair are different. The problem solved by Algorithm A1is formulated as the problem of finding a one-to-one mapping Fk=M*→P of the set of modules Mwith selected orientations, |M*|=|M| to the set P of positions of the template Sh. In fact, the solutionconsists in choosing on the graph G1 a subset of edges E*1E1 included in the correspondingmapping Fk. In Algorithm A2, the graph G2=(X, E2) is developed as a model of the search spacefor solutions for choosing the type, sequence and location of cuts in the pattern Sh.X={(x1i,x2i)|i=1,2,…,n} the set of vertices of the graph G2, corresponds to the set P of potentialpositions of the template Sh for the possible placement of the names of the cut symbols in them.Each potential position piP of the template Sh is modeled by two alternative vertices (x1i,x2i).The choice of the vertex x1i when placing the cuts indicates that a cut of type V is placed in positionpi, the choice of vertex x2i indicates that a cut of type H is placed in position pi. Each iterationl of the general algorithm includes an initial and three main stages. The initial stage is as follows.Co-evolutionary memory matrices are nullified CEM*1 and CEM*2 are reset to zero. At the firststage, each pair of agents dk=(a1k,a2k): – with constructive algorithms A1 and A2 he synthesizeshis solution Wk=(E1k*,Sk); – the Polish expression Shk is formed, corresponding to the solution Wk;– on the basis of Shk, a tree of sections Tk is formed; – on the basis of Tk, the plan Rk is formed andthe estimate of the solution Fk is calculated; – agents deposit (add) the pheromone to the cells ofthe collective evolutionary memory (CEM) matrices CEM*1 and CEM*2 corresponding to thesolution edges Wk=(E1k*,Sk) in the solution search graphs G1 and G2 in an amount proportionalto the solution estimate Fk. At the second stage, the pheromone accumulated in CEM*1 andCEM*2 by agents of the population at iteration l is added to CEM 1 and CEM2. At the third stage,the pheromone is evaporated on the edges of the graphs G1 and G2. Tests have confirmed theeffectiveness of the proposed method. The time complexity of the algorithm, obtained experimentally,coincides with theoretical studies and it is O(n2) for the considered test problems.

Time to Loss of Behavioral and Brainstem Responses of Ducks following Non-Stunned Slaughter.

Simple SummaryFor routine poultry slaughter, animals are stunned prior to the act of slaughter to prevent pain and distress. Halal slaughter requires either reversible or no stunning before performance of the neck cut. This study measured how long it takes for ducks to lose consciousness following non-stunned slaughter in a commercial processing plant. The study found that ducks take up to 383 s to lose consciousness. The performance of a cut higher on the neck resulted in a faster time to loss of consciousness. This study is the first investigation of the time to loss of consciousness following non-stunned slaughter of ducks in commercial conditions. These results could be used to improve the welfare of ducks during non-stunned slaughter, such as recommending a higher neck cut and ensuring appropriate waiting periods between slaughter and birds entering the scalding tanks.Non-stunned slaughter has been extensively described for other farmed species but there has been limited research on waterfowl. The study assessed 34 White Pekin ducks (Anas platyrhynchos) (study 1) in a non-stunned halal slaughterhouse in Brazil for time to loss of consciousness using various behavioral and brainstem indices (balance, cranial nerve reflexes, and muscle tension) and assessed the relationship between extent of clotting, location of neck cut, level of damage to neck vessels/tissues, and the time to onset of unconsciousness. In addition, operator practices were separately observed and neck pathology following the cut was examined in 217 carcasses after bleeding (study 2). In study 1 following the neck cut there was a wide variation between birds in the time to loss of behavioral and brainstem indices, ranging from 20 to 334 and 20 to 383 s for neck and beak tension, respectively. The median time to loss of balance following the neck cut was 166 ± 14 (22–355) seconds. There was a moderate correlation (R = 0.60 and 0.62) between distance of the neck cut and time to loss of balance and neck tension, respectively. This is the first investigation of the time to loss of consciousness following non-stunned slaughter of ducks in commercial conditions. The findings could be used to improve the welfare of ducks during non-stunned slaughter, such as recommending performance of the neck cut closer to the jaw line and ensuring appropriate waiting periods between slaughter and birds entering the scalding tanks.

Integrated roughing, finishing and chamfering turning process of toroidal worm manufacture on a general CNC lathe

The toroidal worm drives are widely used in heavy-duty transmission systems, such as the solar tracker. However, the existing manufacturing methods cannot meet the mass manufacture of toroidal worms and lack flexibility, which prevents the popularization and application of toroidal worm drives. Hence, this paper presented an integrated roughing, finishing and chamfering turning method for any type of toroidal worm manufacturing on a general CNC lathe. Firstly, CL (cutter location) data of flexible rough turning of the toroidal worm were calculated according to the internal profile on the symmetry shaft section of the enveloped gear tooth. The top circle, root circle, dual internal tooth profile, and the tool parameters were included to ensure the uniformity of rough turning CL data. Secondly, the grid data matrix of the tooth surface was constructed based on accurate spiral surfaces of the toroidal worm. Spatial discrete points were converted to polar coordinates and were projected to the symmetry shaft section by a rotational matrix to calculate the finish turning CL data. Thirdly, the intersecting line between the spiral tooth surface and the outline surface of a semi-finished product was iteratively calculated. The characteristic curve of chamfering was defined and subdivided on the symmetry shaft section. Then the CL data of chamfering were obtained by connecting the sequential and biased chamfering discrete points. At last, the NC roughing, finishing, and chamfering turning codes were generated with the taper thread turning instruction and the CL data of different stages. Simulation and experiment have been conducted on a general CNC lathe, the results show that the integrated method is effective and applicable in automatic toroidal worm turning. The method proposed in this paper can greatly improve the manufacturing efficiency of any type of hourglass worm, without a special four-axis linkage machine tool.

Force model of freeform surface multi-axis machining with fillet end mill based on analytical contact analysis

In the multi-axis machining of freeform surface, compared with ball end mill, the fillet end mill has higher machining efficiency under the same residual height and has been widely used. As the most important physical quantity in machining process, milling force has always been the focus of research. In this paper, the contact geometry between fillet end mill and freeform surface is analyzed by analytical method, and then the milling force prediction model of multi-axis machining is established. Based on differential discretization, the cutter location point of multi-axis machining of freeform surface is approximate to multi-axis machining of oblique plane, which simplifies the research object. The inclination angle is defined to describe the relationship among cutter axis, feed, and workpiece in cutter coordinate system. The space range of the cutting edge element participating in material cutting is constructed by the swept surface of previous tool path, the to-be machined surface and the feed direction surface, and the in-cut cutting edge is determined by judging the cutting edge element one by one. Considering cutter run-out, the element cutting forces on the cylindrical and fillet surfaces of fillet end mill are derived, and all the element forces within in-cut cutting edge are summed by vector to obtain the overall milling force of fillet end mill. Simulation results show that, compared with the solid method, this contact analysis method between cutter and workpiece can take both efficiency and accuracy into account. In the machining experiment, the measured force and predicted force are consistent in trend and amplitude, which verifies the effectiveness of the milling force prediction model.

Elliptical torus cutter tool path generation based on minimum distance computation

In mould manufacture the elliptical torus cutters are used for their high cutting velocity, but the special geometry also brings issues in tool path generating and machining quality controlling. In this paper a guide curve tool path generating method for elliptical torus cutters is presented with the cutter location points computed by a minimum distance algorithm and the path spacing determined by an adaptive method. In the minimum distance algorithm, the calculation is resolved into an iterative process from point to freeform surface and an algebraic calculation process from point to elliptical torus surface considering the geometry of the cutter, which reduces the iterative process and improves the computing speed. In the adaptive path spacing method, the contacting geometry between the elliptical cutter and the workpiece surface is analysed and the relations among the scallop height, the tool tilt angle and the path spacing are deduced, based on which the guide curves are adjusted in advance to control the scallop height. Calculating examples and experiments are carried out, showing that the consuming time of cutter location (CL) points computation algorithm is reduced by 30% comparing to earlier method, and the adaptive path spacing method performs better than constant method in both scallop height controlling and tool path shortening. The results indicate that the presented tool path generating method can help to reduce both the machining and machine waiting time as well as ensuring the machining quality.

A Newly Developed State-of-the-Art Full-Scale Excavation Testing Apparatus for Tunnel Boring Machine (TBM)

Construction of urban tunnels using a tunnel boring machine (TBM) is often favored over drilling-and-blasting based excavation method. Often, TBMs are customized and re-used in fields. However, little effort has been made to verify the status quo of the reused TBM prior to its placement, and no apparatus or method is available to examine the excavation performance of whole, assembled TBMs. Therefore, we present a newly developed apparatus which can examine the excavation performance of small cross-section TBMs with the cutterhead diameter of ∼3.5 m at full scale. The equipment was verified with a rock-like concrete specimen, in which the excavation of TBM was examined while varying the thrust and cutterhead rotational speed. The test results reveal the positive impact of thrust on the penetration rate (PR) and penetration depth (Pe), as well as a linear relationship between PR and the cutterhead speed. This proves that the presented full-scale TBM excavation testing method is capable to produce reliable and remarkably consistent results. The presented full-scale excavation testing method can be used to examine the functionality of a TBM of interest and further explore the effect of different ground conditions, such as rock strength, joints, and weathering, and the effect of different cutterhead design, including the number of cutters, cutter shape, and cutter location.

Investigation of ultrasonic-assisted CNC cutting of honeycomb cores

As compared to traditional milling, ultrasonic-assisted cutting of honeycomb core materials has the advantages of small cutting force and superior surface quality. Currently, ultrasonic straight blade V-shaped machining is one of the most efficient roughing processes. The requirement of a processing path to be post-processed based on the processing characteristics of the straight blade cutter is one of the key issues faced while meeting the technological requirements of CNC machine tools for V-shaped machining. A post-processing method of NC code for V-shaped machining of straight blade cutter is proposed in this article. Initially, the V-shaped rough machining process planning is done, followed by the usage of Unigraphics (UG) to output the initial CNC code. Next, the CNC code is executed through the three key technologies of the second arrangement of cutter locations. Later, research is done on information planning of lifting and lowering cutter, along with research on planning of chip breaking toolpath. Eventually, the simulation cutting experiment is carried out through VERICUT. The results demonstrate that the post-processing method can meet the processing requirements.

High efficiency calculation of cutter-workpiece engagement in five-axis milling using distance fields and envelope theory

Cutter-workpiece engagement (CWE) is fundamental to the process mechanics and dynamics modeling. Due to the variation of the feed directions in five-axis milling of freeform surfaces, the instantaneous CWE is complex and time-varying. Therefore, for the industrial part milling process which contains tremendous cutter locations, how to calculate the CWE efficiently and accurately remains a challenge. In this paper, a high efficiency method for CWE calculation in five-axis milling based on the distance field and envelope theory is proposed. In the geometry modeling and milling simulation, workpiece surfaces are modeled using sampled distance fields stored in a well-designed octree data structure for efficient memory usage. The inverted trajectory method is used to calculate the tool swept volume, which is subtracted from the in-process workpiece by performing three-stage intersection detection and accelerated Boolean operation. As for the CWE extraction at a specific cutter location, the feasible contact arcs derived from the cutter surfaces based on the envelop theory are used as geometry primitives to intersect the in-process workpiece. A new segment-evaluation algorithm is offered to find the intersection points of each feasible contact arc with the workpiece surfaces. Finally, the CWE diagram is obtained by combining the entry and exit immersion angles of the engagement arcs at each axis height. The feasibility of the proposed method for industrial applications is evidenced by two case studies conducted on a developed virtual machining simulator. The results of the comparison with the B-rep based method indicate that the proposed method is more efficient while providing good accuracy.

Autonomous reinforcement learning agent for stretchable kirigami design of 2D materials

Mechanical behavior of 2D materials such as MoS2 can be tuned by the ancient art of kirigami. Experiments and atomistic simulations show that 2D materials can be stretched more than 50% by strategic insertion of cuts. However, designing kirigami structures with desired mechanical properties is highly sensitive to the pattern and location of kirigami cuts. We use reinforcement learning (RL) to generate a wide range of highly stretchable MoS2 kirigami structures. The RL agent is trained by a small fraction (1.45%) of molecular dynamics simulation data, randomly sampled from a search space of over 4 million candidates for MoS2 kirigami structures with 6 cuts. After training, the RL agent not only proposes 6-cut kirigami structures that have stretchability above 45%, but also gains mechanistic insight to propose highly stretchable (above 40%) kirigami structures consisting of 8 and 10 cuts from a search space of billion candidates as zero-shot predictions.

Voxel-Based Adaptive Toolpath Planning using GPU for Freeform Surface Machining

Abstract Today freeform surfaces are widely used on products in automobile, aerospace, and die/molds industries, which are generally manufactured using multi-axis CNC machines. Frequent changes in the design of products necessitate creation of CNC part programs which need fast and accurate toolpath generation methods. Traditional toolpath generation methods involve complex computations and are unable to consider multiple surface patches together. The voxel-based CAD model provides the ability to represent the multi-patch surfaces in a discretized manner which can be processed using an advanced parallel computing framework for accurate tool path planning. This paper presents a new method to generate an adaptive Iso-planar toolpath for a 3-axis CNC machine using the voxel-based part model. The algorithm is designed to work on a Graphics Processing Unit (GPU) that allows parallel processing for faster toolpath generation. The proposed approach consists of two main steps, an algorithm to generate gouge free cutter location points from the voxel-based CAD model and an algorithm to find out sidestep and forward step from those cutter location points to create the final CNC tool path. A new image-processing technique has been proposed to identify gouge by detecting the shadow surface voxels and their intersection with the cutting tool. The developed system was extensively tested and compared with the various reported toolpath planning strategies for machining complex freeform surface parts. The results show that the developed method is computationally efficient, robust, and accurate in generating adaptive planar toolpath.

WITHDRAWN: Utilization of filter for seepage phenomenon reduction under hydraulic structures

Abstract Water movement under hydraulic structures through a permeable layer of soil is considered as one of the main causes of failure of hydraulic structures. Therefore, this study aims to minimize the influence of water movement under hydraulic structures by using a filter. The case was simulated using the finite element analysis software ANSYS where many valuables were studied such as head of water, depth of upstream cut off wall, filter depth, and filter location. Such variables usually influence the uplift pressure, exit gradient and seepage discharge, which control the performance of the hydraulic structure. The results have shown that the position of filter at downstream leads to increases the seepage discharge and exit gradient, while at upstream, it reduces the uplift pressure significantly.

Adaptive spiral tool path generation for computer numerical control machining using point cloud

This paper reports a novel method to generate adaptive spiral tool path for the CNC machining of complex sculptured surface represented in the form of cloud of points without the need for surface fitting. The algorithm initially uses uniform 2 D circular mesh-grid to compute the cutter location (CL) points by applying the tool inverse offset method (IOM). These CL points are refined adaptively till the surface form errors converge below the prescribed tolerance limits in both circumferential and radial directions. They are further refined to eliminate the redundancy in machining and generate optimum region wise tool path to minimize the tool lifts. The NC part programs generated by our algorithm were widely tested for different case studies using the commercial CNC simulator as well as by the actual machining trial. Finally, a comparative study was done between our developed system and the commercial CAM software. The results showed that our system is more efficient and robust in terms of the obtained surface quality, productivity, and memory requirement.

Effect of Harvest Time, Delay in Destemming and Desapping Treatment on the Sap Volume and Visual Quality of ‘Carabao’ Mango Fruit

The sap or latex injury in mango reduces fruit quality as it causes skin blemish during harvesting and postharvest handling. Sap volume and visual quality of ‘Carabao’ mango as affected by different harvest times during the day (every hour from 7:00 AM to 5:00 PM), delay in cutting (hourly up to 6 h) of the pedicel at either the pedicel base or at the abscission zone and different desapping agents applied 1 or 7 h from harvest were assessed. Sap injury was assessed by allowing the sap to flow on the fruit after re-cutting the pedicel at the abscission zone. Sap volume was measured during harvesting while sap injury, days to table ripe stage, visual quality, weight loss, degree of anthracnose and stem end rot were assessed during fruit storage. The experiments were laid out using the completely randomized design. Sap volume ranged from 0.06 to 0.25 mL fruit-1. The lowest sap volume was recorded in fruit harvested in the afternoon between 1:00 and 5:00 PM, while the highest volume was noted at 7:00 and 10:00 AM. The relative humidity of the air was highest at 7:00 AM. Better quality at table ripe stage was noted in mango fruit harvested at 1:00 - 2:00 and 4:00 - 5:00 PM. Sap injury at different harvest times did not vary. The delay in the destemming up to 6 h and the location of cut or pedicel length did not affect sap volume and fruit quality. However, the cutting of the pedicel at the abscission zone rather than at the pedicel base tended to result in better quality, which helped delay fruit ripening. All desapping treatments, such as 1.0 % alum, 1.0 % detergent, 0.5 % lime [Ca(OH)2], and water, could control sap injury. Untreated fruit showed longer shelf life due to a lower degree of anthracnose. Stem-end rot did vary among desapping agents. Among the desapping treatments, water is found to reduce sap damage better. Harvesting later in the day, cutting at the abscission zone, and washing mangoes with water can reduce sap or latex damage in ‘Carabao’ mango.

Analytical cut geometry calculation for multi-pass rough milling of a free-form surface machining

This paper presents a simple analytical approach to define cut geometry of multi-pass rough milling during a free-form surface milling. The shape of in-process workpiece surface was identified using the coordinate of corner points that are found in every step of stair-surface. In every instantaneous tool location, the workpiece sections that have possibility intersecting with the cutting edge were identified based on the coordinate of cutter location point. The algorithm was developed for machining using indexable flat end-mill by considering the effect of helix angle to the cut geometry. The proposed method was successfully used to determine the length of cut and generate the shape of cuts. The implementation test also demonstrated that helix angle tends to produce larger cut.The validation of the accuracy was carried out by comparing the length of cut measured using CAD software with those generated by the proposed approach. The results showed that the differences were very small or less than 0.4%. Therefore, it can be taken into conclusion that the method was accurate. The comparison test on computational time was conducted. ABS took only 1.63 second for calculating cut geometry during one tool pass, while Z-mapping method spent 23.21 second. This result proved that ABS is computationally more efficient.

Differences in phosphatidylcholine profiles and identification of characteristic phosphatidylcholine molecules in meat animal species and meat cut locations

Phosphatidylcholine (PC) is an essential component of the plasma membrane. Its profile varies with species and tissues. However, the PC profiles in meat have not been explored in depth. This study aimed to investigate the differences in PC profiles between various meat animal species and meat cut sites, along with the identification of characteristic PC molecules. The results demonstrated that the PC profiles of chicken meat differed from those of other species. Significant differences were also observed between the PC profiles of pork meat and the meat obtained from other species. The amount of PCs containing ether bonds was high in pork meat. PCs containing an odd number of carbon atoms were characteristic of beef and lamb meats. Furthermore, PC profiles differed based on the muscle location in chicken and pork. These results suggest that the PC profiles of skeletal muscles are indicators of animal species and muscle location.

Resurgence in the bi-Yang-Baxter model

We study the integrable bi-Yang-Baxter deformation of the SU(2) principal chiral model (PCM) and its finite action uniton solutions. Under an adiabatic compactification on an S1, we obtain a quantum mechanics with an elliptic Lamé-like potential.We perform a perturbative calculation of the ground state energy in this quantum mechanics to large orders obtaining an asymptotic series. Using the Borel-Padé technique, we determine the expected locations of branch cuts in the Borel plane of the perturbative series and show that they match the values of the uniton actions. Therefore, we can match the non-perturbative contributions to the energy with the uniton solutions which fractionate upon adiabatic compactification.An off-shoot of the WKB analysis, is to identify the quadratic differential of this deformed PCM with that of an N=2 Seiberg-Witten theory. This can be done either as an Nf=4SU(2) theory or as an elliptic quiver SU(2)×SU(2) theory. The mass parameters of the gauge theory are given by the deformation parameters of the PCM.

Confinement model for FRP-wrapped circular columns when the wraps are subjected to damage

Fiber-reinforced polymer (FRP) wrapped concrete columns are vulnerable to accidental damage or vandalism, which may cause physical cuts or tearing of the jacket, thereby compromising the confined strength and ductility of the column. This paper aims at providing a simple tool to reassess the strength under a given level of damage. Finite element (FE) models were developed to examine a variety of cuts in the FRP jacket and develop a confinement model including the damage effects. After validation with 37 experimental tests from literature, the FE model was used in a comprehensive parametric analysis, examining different geometric and material variables, namely: cut orientation (longitudinal or circumferential); cut length and location, diameter-to-jacket thickness ratio, multiple cuts, concrete strength, and FRP elastic modulus. Results of the numerical models were analyzed using multiple nonlinear regression (MNR). New equations were developed to predict the reduction in axial strength and corresponding strain at ultimate. Reduction factors have been proposed, which are then easily implemented in commonly used confinement models in design guides such as ACI 440.2R.

A mathematical model for the scheduling and definition of mining cuts in short-term mine planning

Short-term open pit planners have to deal with the task of designing a feasible production schedule. This schedule must fulfill processing, mining and operational constraints and, at the same time, maximize the profit or total metal produced. It also must comply with the long-term production schedule and must incorporate new blasthole sampling data. This task is performed with little support of optimization tools, and therefore, there is a risk of generating suboptimal results. Several approaches have been proposed in the literature to deal with these issues, either generating operational mining cuts or obtaining a mining schedule to fulfill the short-term constraints. However, an integrated approach has remained an open challenge. In this paper, we propose an optimization model to tackle the operational and scheduling issues simultaneously. The model defines the mining cut configuration and the production schedule in the short-term. It is based on representative Selective Mining Units (SMUs) as the potential locations of the mining cuts and then each SMU is assigned to one of these locations. We tested the model with a real case study, and it was able to generate mining cuts and an extraction sequence fulfilling mining, processing and operational constraints, as well as access restrictions given by the ramp location in each bench. The mining cut design captured most of the profit, and thus it can be used as a guide for the short-term mine planner. The location of the representative SMUs and the precedence definition both impact the mining cut configuration, and future research could address how to incorporate different operational considerations and strategies on the location of these representatives.

New algorithm to calculate the cutter location points (CL) optimizing the chordal tolerance for 2 ½ axis milling of free form surfaces

Even though the high order polynomial can be used to describe a free form tool path for CNC milling, traditional linear interpolation (G01) is the most used today. As investigated in a previous work, different CAM systems calculate different points (CC) to mill the same surface under the same tolerance and cutting conditions. The current work presents a new approach to generate NC codes optimizing the use of the chordal tolerance for 2½ milling. The experimental results shown that the NC codes generated by the proposed method reduced in about 60% the milling time by reducing the CC points, without losing the accuracy.

KEARIFAN LOKAL MASYARAKAT DUSUN TEKALONG DESA SETIA JAYA DALAM MENJAGA KEBERADAAN TEMBAWANG DI KECAMATAN TERIAK KABUPATEN BENGKAYANG

Tembawang is a form of land management carried out by the Dayak people in West Kalimantan. The exixtence of Tembawang in Tekalong Hamlet is still well preserved, it is suspected that the community is carrying out local wisdom in its management. This study aims to describe the forms of local wisdom that consist of knowledge, norms, regulations, and skills in Tekalong Village, Setia Jaya Village in tembawang management. The study was conducted using a survey method that is descriptive with interview techniques and questionnaire aids in the form of a list of questions submitted to a number of people (respondents). Respondents in this study were 30 people. There are 4 tembawang in Tekalong Hamlet, namely Tembawang Tekalong, Tembawang Sunge Tangket, Tembawang Bangkaris, and Tembawang Madas. The results of this study indicate that there are (5) forms of local wisdom that support the management of tembawang in Tekalong Hamlet, namely : (1). Knowledge, apply customary law to every violatoin both intentionally or unintentionally, the community also believes in several myths to be used as role models in managing Tembawang. (2). Norm, there are certain days the people cut Tembawang location. (3). Regulations, no trees can be cut down in Tembawang, and may not carry out activities that can damage the ecosystem that is in Tembawang. (4). Skills, the community utilizes the Tembawang land by planting fruit-producing trees, and (5). Trust, the presence of a ghost (Kuntilanak) who was killed, the myth of the worm king who became a watchman on Tembawang, may not build a house/sacred landKeywords : Local Wisdom, Indigenous people, Tembawang