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Computer Engineering Curricula 2004

Sumber: Computer Engineering  2004  Curriculum Guidelines for Undergraduate Degree Programs in Computer Engineering https://dl.acm.org/doi/pdf/10.5555/2479869


Computer Engineering Knowledge Areas and Units

• CE-ALG Algorithms [30 core hours]
• CE-ALG0 History and overview [1]
• CE-ALG1 Basic algorithmic analysis [4] *
• CE-ALG2 Algorithmic strategies [8] *
• CE-ALG3 Computing algorithms [12] *
• CE-ALG4 Distributed algorithms [3] *
• CE-ALG5 Algorithmic complexity [2] *
• CE-ALG6 Basic computability theory *

CE-CAO Computer Architecture and Organization [63 core hours]

• CE-CAO0 History and overview [1]
• CE-CAO1 Fundamentals of computer architecture [10]
• CE-CAO2 Computer arithmetic [3]
• CE-CAO3 Memory system organization and architecture [8]
• CE-CAO4 Interfacing and communication [10]
• CE-CAO5 Device subsystems [5]
• CE-CAO6 Processor systems design [10]
• CE-CAO7 Organization of the CPU [10]
• CE-CAO8 Performance [3]
• CE-CAO9 Distributed system models [3]
• CE-CAO10 Performance enhancements

CE-CSE Computer Systems Engineering [18 core hours]

• CE-CSE0 History and overview [1]
• CE-CSE1 Life cycle [2]
• CE-CSE2 Requirements analysis and elicitation [2]
• CE-CSE3 Specification [2]
• CE-CSE4 Architectural design [3]
• CE-CSE5 Testing [2]
• CE-CSE6 Maintenance [2]
• CE-CSE7 Project management [2]
• CE-CSE8 Concurrent (hardware/software) design [2]
• CE-CSE9 Implementation
• CE-CSE10 Specialized systems
• CE-CSE11 Reliability and fault tolerance

CE-CSG Circuits and Signals [43 core hours]

• CE-CSG0 History and overview [1]
• CE-CSG1 Electrical Quantities [3]
• CE-CSG2 Resistive Circuits and Networks [9]
• CE-CSG3 Reactive Circuits and Networks [12]
• CE-CSG4 Frequency Response [9]
• CE-CSG5 Sinusoidal Analysis [6]
• CE-CSG6 Convolution [3]
• CE-CSG7 Fourier Analysis
• CE-CSG8 Filters
• CE-CSG9 Laplace Transforms

CE-DBS Database Systems [5 core hours]

• CE-DBS0 History and overview [1]
• CE-DBS1 Database systems [2] *
• CE-DBS2 Data modeling [2] *
• CE-DBS3 Relational databases *
• CE-DBS4 Database query languages *
• CE-DBS5 Relational database design *
• CE-DBS6 Transaction processing *
• CE-DBS7 Distributed databases *
• CE-DBS8 Physical database design *

CE-DIG Digital Logic [57 core hours]

• CE-DIG0 History and overview [1]
• CE-DIG1 Switching theory [6]
• CE-DIG2 Combinational logic circuits [4]
• CE-DIG3 Modular design of combinational circuits [6]
• CE-DIG4 Memory elements [3]
• CE-DIG5 Sequential logic circuits [10]
• CE-DIG6 Digital systems design [12]
• CE-DIG7 Modeling and simulation [5]
• CE-DIG8 Formal verification [5]
• CE-DIG9 Fault models and testing [5]
• CE-DIG10 Design for testability

CE-DSP Digital Signal Processing [17 core hours]

• CE-DSP0 History and overview [1]
• CE-DSP1 Theories and concepts [3]
• CE-DSP2 Digital spectra analysis [1]
• CE-DSP3 Discrete Fourier transform [7]
• CE-DSP4 Sampling [2]
• CE-DSP5 Transforms [2]
• CE-DSP6 Digital filters [1]
• CE-DSP7 Discrete time signals
• CE-DSP8 Window functions
• CE-DSP9 Convolution
• CE-DSP10 Audio processing
• CE-DSP11 Image processing

CE-ELE Electronics [40 core hours]

• CE-ELE0 History and overview [1]
• CE-ELE1 Electronic properties of materials [3]
• CE-ELE2 Diodes and diode circuits [5]
• CE-ELE3 MOS transistors and biasing [3]
• CE-ELE4 MOS logic families [7]
• CE-ELE5 Bipolar transistors and logic families [4]
• CE-ELE6 Design parameters and issues [4]
• CE-ELE7 Storage elements [3]
• CE-ELE8 Interfacing logic families and standard buses [3]
• CE-ELE9 Operational amplifiers [4]
• CE-ELE10 Circuit modeling and simulation [3]
• CE-ELE11 Data conversion circuits
• CE-ELE12 Electronic voltage and current sources
• CE-ELE13 Amplifier design
• CE-ELE14 Integrated circuit building blocks

CE-ESY Embedded Systems [20 core hours]

• CE-ESY0 History and overview [1]
• CE-ESY1 Embedded microcontrollers [6]
• CE-ESY2 Embedded programs [3]
• CE-ESY3 Real-time operating systems [3]
• CE-ESY4 Low-power computing [2]
• CE-ESY5 Reliable system design [2]
• CE-ESY6 Design methodologies [3]
• CE-ESY7 Tool support
• CE-ESY8 Embedded multiprocessors
• CE-ESY9 Networked embedded systems
• CE-ESY10 Interfacing and mixed-signal systems

CE-HCI Human-Computer Interaction [8 core hours]

• CE-HCI0 History and overview [1]
• CE-HCI1 Foundations of human-computer interaction [2] *
• CE-HCI2 Graphical user interface [2] *
• CE-HCI3 I/O technologies [1] *
• CE-HCI4 Intelligent systems [2] *
• CE-HCI5 Human-centered software evaluation *
• CE-HCI6 Human-centered software development *
• CE-HCI7 Interactive graphical user-interface design *
• CE-HCI8 Graphical user-interface programming *
• CE-HCI9 Graphics and visualization *
• CE-HCI10 Multimedia systems *

CE-NWK Computer Networks [21 core hours]

• CE-NWK0 History and overview [1]
• CE-NWK1 Communications network architecture [3]
• CE-NWK2 Communications network protocols [4]
• CE-NWK3 Local and wide area networks [4]
• CE-NWK4 Client-server computing [3]
• CE-NWK5 Data security and integrity [4]
• CE-NWK6 Wireless and mobile computing [2]
• CE-NWK7 Performance evaluation
• CE-NWK8 Data communications
• CE-NWK9 Network management
• CE-NWK10 Compression and decompression

CE-OPS Operating Systems [20 core hours]

• CE-OPS0 History and overview [1]
• CE-OPS1 Design principles [5] *
• CE-OPS2 Concurrency [6] *
• CE-OPS3 Scheduling and dispatch [3] *
• CE-OPS4 Memory management [5] *
• CE-OPS5 Device management *
• CE-OPS6 Security and protection *
• CE-OPS7 File systems *
• CE-OPS8 System performance evaluation *

CE-PRF Programming Fundamentals [39 core hours]

• CE-PRF0 History and overview [1]
• CE-PRF1 Programming Paradigms [5] *
• CE-PRF2 Programming constructs [7] *
• CE-PRF3 Algorithms and problem-solving [8] *
• CE-PRF4 Data structures [13] *
• CE-PRF5 Recursion [5] *
• CE-PRF6 Object-oriented programming *
• CE-PRF7 Event-driven and concurrent programming *
• CE-PRF8 Using APIs *

CE-SPR Social and Professional Issues [16 core hours]

• CE-SPR0 History and overview [1]
• CE-SPR1 Public policy [2] *
• CE-SPR2 Methods and tools of analysis [2] *
• CE-SPR3 Professional and ethical responsibilities [2] *
• CE-SPR4 Risks and liabilities [2] *
• CE-SPR5 Intellectual property [2] *
• CE-SPR6 Privacy and civil liberties [2] *
• CE-SPR7 Computer crime [1] *
• CE-SPR8 Economic issues in computing [2] *
• CE-SPR9 Philosophical frameworks *

CE-SWE Software Engineering [13 core hours]

• CE-SWE0 History and overview [1]
• CE-SWE1 Software processes [2] *
• CE-SWE2 Software requirements and specifications [2] *
• CE-SWE3 Software design [2] *
• CE-SWE4 Software testing and validation [2] *
• CE-SWE5 Software evolution [2] *
• CE-SWE6 Software tools and environments [2] *
• CE-SWE7 Language translation *
• CE-SWE8 Software project management *
• CE-SWE9 Software fault tolerance *

CE-VLS VLSI Design and Fabrication [10 core hours]

• CE-VLS0 History and overview [1]
• CE-VLS1 Electronic properties of materials [2]
• CE-VLS2 Function of the basic inverter structure [3]
• CE-VLS3 Combinational logic structures [1]
• CE-VLS4 Sequential logic structures [1]
• CE-VLS5 Semiconductor memories and array structures [2]
• CE-VLS6 Chip input/output circuits
• CE-VLS7 Processing and layout
• CE-VLS8 Circuit characterization and performance
• CE-VLS9 Alternative circuit structures/low power design
• CE-VLS10 Semi-custom design technologies
• CE-VLS11 ASIC design methodology

CE-DSC Discrete Structures [33 core hours]

• CE-DSC0 History and overview [1]
• CE-DSC1 Functions, relations, and sets [6] *
• CE-DSC2 Basic logic [10] *
• CE-DSC3 Proof techniques [6] *
• CE-DSC4 Basics of counting [4] *
• CE-DSC5 Graphs and trees [4] *
• CE-DSC6 Recursion [2] *

CE-PRS Probability and Statistics [33 core hours]

• CE-PRS0 History and overview [1]
• CE-PRS1 Discrete probability [6]
• CE-PRS2 Continuous probability [6]
• CE-PRS3 Expectation [4]
• CE-PRS4 Stochastic Processes [6]
• CE-PRS5 Sampling distributions [4]
• CE-PRS6 Estimation [4]
• CE-PRS7 Hypothesis tests [2]
• CE-PRS8 Correlation and regression

Computer Engineering Curricula 2016

CE2016 Knowledge Areas (https://www.acm.org/binaries/content/assets/education/ce2016-final-report.pdf)

Knowledge Areas

• CE-CAE Circuits and Electronics
• CE-CAL Computing Algorithms
• CE-CAO Computer Architecture and Organization
• CE-DIG Digital Design
• CE-ESY Embedded Systems
• CE-NWK Computer Networks
• CE-PPP Preparation for Professional Practice
• CE-SEC Information Security
• CE-SGP Signal Processing
• CE-SPE Systems and Project Engineering
• CE-SRM Systems Resource Management
• CE-SWD Software Design

Knowledge Areas and Knowledge Units

CE-CAE Circuits and Electronics[50 core hours]

• CE-CAE-1 History and overview [1]
• CE-CAE-2 Relevant tools, standards, and/or engineering constraints [3]
• CE-CAE-3 Electrical quantities and basic elements [4]
• CE-CAE-4 Electrical circuits [11]
• CE-CAE-5 Electronic materials, diodes, and bipolar transistors [7]
• CE-CAE-6 MOS transistor circuits, timing, and power [12]
• CE-CAE-7 Storage cell architecture [3]
• CE-CAE-8 Interfacing logic families [3]
• CE-CAE-9 Operational amplifiers [3]
• CE-CAE-10 Mixed-signal circuit design [3]
• CE-CAE-11 Design parameters and issues
• CE-CAE-12 Circuit modeling and simulation methods

CE-CAL Computing Algorithms[30 core hours]

• CE-CAL-1 History and overview [1]
• CE-CAL-2 Relevant tools, standards and/or engineering constraints [1]
• CE-CAL-3 Basic algorithmic analysis [4]
• CE-CAL-4 Algorithmic strategies [6]
• CE-CAL-5 Classic algorithms for common tasks [3]
• CE-CAL-6 Analysis and design of application-specific algorithms [6]
• CE-CAL-7 Parallel algorithms and multi-threading [6]
• CE-CAL-8 Algorithmic complexity [3]
• CE-CAL-9 Scheduling algorithms
• CE-CAL-10 Basic computability theory

CE-CAO Computer Architecture and Organization[60 core hours]

• CE-CAO-1 History and overview [1]
• CE-CAO-2 Relevant tools, standards and/or engineering constraints [1]
• CE-CAO-3 Instruction set architecture [10]
• CE-CAO-4 Measuring performance [3]
• CE-CAO-5 Computer arithmetic [3]
• CE-CAO-6 Processor organization [10]
• CE-CAO-7 Memorysystem organization and architectures [9]
• CE-CAO-8 Input/Output interfacing and communication [7]
• CE-CAO-9 Peripheral subsystems [7]
• CE-CAO-10 Multi/Many-core architectures [5]
• CE-CAO-11 Distributed system architectures [4]

CE-DIG Digital Design[50 core hours]

• CE-DIG-1 History and overview [1]
• CE-DIG-2 Relevant tools, standards, and/or engineering constraints [2]
• CE-DIG-3 Number systems and data encoding [3]
• CE-DIG-4 Boolean algebra applications [3]
• CE-DIG-5 Basic logic circuits [6]
• CE-DIG-6 Modular design of combinational circuits [8]
• CE-DIG-7 Modular design of sequential circuits [9]
• CE-DIG-8 Control and datapath design [9]
• CE-DIG-9 Design with programmable logic [4]
• CE-DIG-10 System design constraints [5]
• CE-DIG-11 Fault models, testing, and design for testability

CE-ESY Embedded Systems[40 core hours]

• CE-ESY-1 History and overview [1]
• CE-ESY-2 Relevant tools, standards, and/or engineering constraints [2]
• CE-ESY-3 Characteristics of embedded systems [2]
• CE-ESY-4 Basic software techniques for embedded applications [3]
• CE-ESY-5 Parallel input and output [3]
• CE-ESY-6 Asynchronous and synchronous serial communication [6]
• CE-ESY-7 Periodic interrupts, waveform generation, time measurement [3]
• CE-ESY-8 Data acquisition, control, sensors, actuators [4]
• CE-ESY-9 Implementation strategies for complex embedded systems [7]
• CE-ESY-10 Techniques for low-power operation [3]
• CE-ESY-11 Mobile and networked embedded systems [3]
• CE-ESY-12 Advanced input/outputissues[3]
• CE-ESY-13 Computing platforms for embedded systems

CE-NWK Computer Networks[20 core hours]

• CE-NWK-1 History and overview [1]
• CE-NWK-2 Relevant tools, standards, and/or engineering constraints [1]
• CE-NWK-3 Network architecture [4]
• CE-NWK-4 Local and wide area networks [4]
• CE-NWK-5 Wireless and mobile networks [2]
• CE-NWK-6 Network protocols [3]
• CE-NWK-7 Network applications [2]
• CE-NWK-8 Network management [3]
• CE-NWK-9 Data communications
• CE-NWK-10 Performance evaluation
• CE-NWK-11 Wireless sensor networks

CE-PPP Preparation for Professional Practice[20 core hours]

• CE-PPP-1 History and overview [1]
• CE-PPP-2 Relevant tools, standards, and/or engineering constraints [1]
• CE-PPP-3 Effective communication strategies [2]
• CE-PPP-4 Interdisciplinary team approaches [1]
• CE-PPP-5 Philosophical frameworks and cultural issues [2]
• CE-PPP-6 Engineering solutions and societal effects [2]
• CE-PPP-7 Professional and ethical responsibilities [3]
• CE-PPP-8 Intellectual property and legal issues [3]
• CE-PPP-9 Contemporary issues [2]
• CE-PPP-10 Business and management issues[3]
• CE-PPP-11 Tradeoffs in professional practice

CE-SEC Information Security[20 core hours]

• CE-SEC-1 History and overview [2]
• CE-SEC-2 Relevant tools, standards, and/or engineering constraints [2]
• CE-SEC-3 Data security and integrity [1]
• CE-SEC-4 Vulnerabilities: technical and human factors[4]
• CE-SEC-5 Resource protection models[1]
• CE-SEC-6 Secret and public key cryptography [3]
• CE-SEC-7 Message authentication codes [1]
• CE-SEC-8 Network and web security[3]
• CE-SEC-9 Authentication [1]
• CE-SEC-10 Trusted computing [1]
• CE-SEC-11 Side-channel attacks [1]

CE-SGP Signal Processing[30 core hours]

• CE-SGP-1 History and overview [1]
• CE-SGP-2 Relevant tools, standards, and/or engineering constraints [3]
• CE-SGP-3 Convolution [3]
• CE-SGP-4 Transform analysis [5]
• CE-SGP-5 Frequency response [5]
• CE-SGP-6 Sampling and aliasing [3]
• CE-SGP-7 Digital spectra and discrete transforms [6]
• CE-SGP-8 Finite and infinite impulse response filter design [4]
• CE-SGP-9 Window functions
• CE-SGP-10 Multimedia processing
• CE-SGP-11 Control system theory and applications

CE-SPE Systems and Project Engineering[35 core hours]

• CE-SPE-1 History and overview [1]
• CE-SPE-2 Relevant tools, standards and/or engineering constraints [3]
• CE-SPE-3 Project management principles [3]
• CE-SPE-4 User experience*[6]
• CE-SPE-5 Risk, dependability, safety and fault tolerance [3]
• CE-SPE-6 Hardware and software processes [3]
• CE-SPE-7 Requirements analysis and elicitation [2]
• CE-SPE-8 System specifications [2]
• CE-SPE-9 System architectural design and evaluation [4]
• CE-SPE-10 Concurrent hardware and software design [3]
• CE-SPE-11 System integration, testing and validation [3]
• CE-SPE-12 Maintainability, sustainability, manufacturability [2]

CE-SRM Systems Resource Management[20 core hours]

• CE-SRM-1 History and overview[1]
• CE-SRM-2 Relevant tools, standards, and/orengineering constraints [1]
• CE-SRM-3 Managing system resources [8]
• CE-SRM-4 Real-time operating system design [4]
• CE-SRM-5 Operating systems for mobile devices [3]
• CE-SRM-6 Support for concurrent processing [3]
• CE-SRM-7 System performance evaluation
• CE-SRM-8 Support for virtualization

CE-SWD Software Design[45 core hours]

• CE-SWD-1 History and overview [1]
• CE-SWD-2 Relevant tools, standards, and/or engineering constraints [3]
• CE-SWD-3 Programming constructs and paradigms [12]
• CE-SWD-4 Problem-solving strategies [5]
• CE-SWD-5 Data structures [5]
• CE-SWD-6 Recursion [3]
• CE-SWD-7 Object-oriented design [4]
• CE-SWD-8 Software testing and quality [5]
• CE-SWD-9 Data modeling [2]
• CE-SWD-10 Database systems [3]
• CE-SWD-11 Event-driven and concurrent programming[2]
• CE-SWD-12 Using application programming interfaces
• CE-SWD-13 Data mining
• CE-SWD-14 Data visualization

CE-ACF Analysis of Continuous Functions[30 core hours]

• CE-ACF-1 History and overview [1]
• CE-ACF-2 Relevant toolsand engineering applications[1]
• CE-ACF-3 Differentiation methods [4]
• CE-ACF-4 Integration methods [6]
• CE-ACF-5 Linear differential equations [8]
• CE-ACF-6 Non-linear differential equations [3]
• CE-ACF-7 Partial differential equations [5]
• CE-ACF-8 Functional series [2]

CE-DSC Discrete Structures[30 core hours]

• CE-DSC-1 History and overview [1]
• CE-DSC-2 Relevant tools and engineering applications [1]
• CE-DSC-3 Functions, relations, and sets [6]
• CE-DSC-4 Boolean algebra principles [4]
• CE-DSC-5 First-order logic [6]
• CE-DSC-6 Proof techniques [6]
• CE-DSC-7 Basics of counting [2]
• CE-DSC-8 Graph and treerepresentations and properties[2]
• CE-DSC-9 Iteration and recursion [2]

CE-LAL Linear Algebra[30 core hours]

• CE-LAL-1 History and overview [1]
• CE-LAL-2 Relevant toolsand engineering applications[2]
• CE-LAL-3 Bases, vector spaces, and orthogonality [4]
• CE-LAL-4 Matrix representations of linear systems [4]
• CE-LAL-5 Matrix inversion [2]
• CE-LAL-6 Linear transformations [3]
• CE-LAL-7 Solution of linear systems [3]
• CE-LAL-8 Numerical solution of non-linear systems [4]
• CE-LAL-9 System transformations [3]
• CE-LAL-10 Eigensystems [4]

CE-PRS Probability and Statistics[30 core hours]

• CE-PRS-1 History and overview [1]
• CE-PRS-2 Relevant toolsand engineering applications[2]
• CE-PRS-3 Discrete probability [5]
• CE-PRS-4 Continuous probability [4]
• CE-PRS-5 Expectationand deviation[2]
• CE-PRS-6 Stochastic Processes [4]
• CE-PRS-7 Sampling distributions [4]
• CE-PRS-8 Estimation [4]
• CE-PRS-9 Hypothesis tests [2]
• CE-PRS-10 Correlation and regression[2]

Sungai Dengan Normalisasi Dan Naturalisasi di Singapura

Di suatu diskusi, ada yang membandingkan 2 macam kondisi sungai, yaitu normalisasi sungai dan naturalisasi sungai. URL diskusi:  https://twitter.com/pemudajawa/status/1213026494072729600

Sebagai contoh adalah 2 foto di Singapura sebagai berikut:

Menurut rekan yang berdomisili di Singapura, kedua foto tersebut diambil dari 2 tempat yang berbeda.

Kedua foto diambil di Kallang River.
Foto "Before" nampaknya diambil di dekat jalan Kallang Bahru [LINK]

Berikut perbandingan foto "Before" dengan foto Google Street View dari atas jembatan Kallang Bahru

Kemungkinan besar foto "Before" diambil dari jalan sepeda di pinggir sungai Kallang. Tidak ada Street View dari jalan sepeda tersebut, sehingga gambar yang mirip adalah dari tengah jembatan sungai Kallang. Pada foto terkini nampak ada beberapa gedung yang tidak ada di foto "Before", jadi kemungkinan foto "Before" diambil beberapa tahun yang lalu.


Foto "After" diambil antara Bishan Road & Braddle Road. Berikut ini ada foto yang menyerupai [LINK]

Pada tautan [LINK] dapat dilihat beberapa foto di kawasan tersebut.

Sungai versi lama memang penampilannya kaku [LINK]

Hasil pencarian dengan Google Streetview tidak membuahkan hasil, karena foto Google Streetview masih berisi foto kanal versi lama, yang menggunakan beton.

Kesimpulan

• Foto itu dikutip dari website https://mothership.sg/2019/09/kallang-river-upgraded/  di artikel tersebut memang disebut sebagai foto "Before" dan "After"
• Kedua foto diambil di Kallang River
• Kedua foto terkait dengan perbaikan daerah sungai di Kallang River
• Foto "Before" diambil dari pathway di sekitar jembatan Kallang Bahru 
• Foto "Before" diambil sudah cukup lama , karena ada beberapa gedung yang tidak ada di Google Streetview
• Foto "After" diambil di antara Bishan Road & Bradwell Road. 
• Foto After diambil cukup baru, karena di Google Streetview masih berupa kanal versi lama dari beton

Membongkar Handpresso Pump

Handpresso Pump adalah suatu jenis mesin kopi espresso portabel. Barangnya kecil, mudah dibawa-bawa, dan hasilnya cukup enak dengan aroma espresso yang mantap.

Handpresso Pump, menurut promosi produsennya

Handpresso pump yang saya miliki beberapa waktu lalu mampet, jadi udara tekanan tinggi yang sudah dipompa tidak dapat mendorong air, sehingga tidak bisa dipakai untuk membuat kopi. Diagnosis singkat ada masalah di saluran udara di sekitar katup, sehingga dimulailah upaya membersihkan katup tersebut.

Tahap pertama adalah membongkar handpresso pump tersebut. Teknik membuka handpresso pump cukup banyak  di internet / youtube, namun tidak sampai membongkar katup.

Setelah dibongkar (minus katupnya), beberapa cara sudah ditempuh namun gagal:

• direndam air panas
• dipanaskan
• dibuka dan direndam 
• dicuci dengan pembersih ultrasonik
• dan kombinasi dari teknik di atas.

Karena tidak mempan, akhirnya diputuskan untuk membongkar katup.

Alat-alat yang dipakai:

• obeng minus 
• tang bulat untuk membuka katup
• tang burung untuk membuka pompa
• paku yang dibengkokkan untuk membongkar katup
• Jarum suntik, untuk membantu mencongkel karet pada katup. Tidak terlalu penting, pakai paku sebenarnya cukup.
• Wadah untuk menampung komponen-komponen yang sudah dibongkar. Hati-hati, karena kalau ada 1 yang hilang maka handpresso pump tidak akan berfungsi.

Berikut ini tahap yang ditempuh.

Congkel tutup plastik dengan menggunakan obeng minus.

Copot sekrup

Copot pin penahan pengukur tekanan. Kalau susah, bisa dicongkel dengan menggunakan obeng minus. Berikut ini pin penahan yang sudah dicopot.

 Selanjutnya mencopot pengukur tekanan. Di beberapa video, pengukur tekanan udara ini dapat dicopot dengan cara ditarik, namun pada kasus yang saya hadapi, ditarik saja tidak cukup. Perlu didorong dengan memompa udara, namun hati-hati dengan teknik ini, karena pengukur tekanan ini akan 'terbang' akibat dorongan udara dari dalam. Jadi pastikan pengukur tekanan ini akan 'mendarat' di tempat yang aman.

Selanjutnya membongkar wadah air. Caranya dengan mencopot 4 sekrup penahannya. 

Berikut ini wadah air yang sudah dicopot. Pastikan ada 4 sekrup, dan ada 1 ring karet untuk perapat saluran udara dari katup ke wadah air. Pada tahap ini saluran udara dari katup ke wadah air dapat dicek apakah tersumbat atau lancar.

Berikutnya adalah mencopot pompa udara. 

 

Di beberapa video, pompa ini dapat dicopot hanya dengan diputar dengan tangan. Pada kasus saya, pompa ini mesti diputar dengan menggunakan tang burung. Bahan plastiknya cukup keras, jadi tidak terlalu tergores oleh tang burung tersebut.

 Berikut ini pompa yang sudah berhasil dicopot. Perhatikan ada ulir , dan di dekat ulir ada 'O ring' dari bahan karet hitam. Pastikan ring karet ini tidak rusak. Pada waktu baru dibongkar, nampak ada serbuk-serbuk putih di bagian dalam pompa ini, serta agak lengket dan berminyak. Dicurigai serbuk putih dan minyak yang lengket adalah sisa-sisa dari gemuk pelumas pompa tersebut. Ada kemungkinan serbuk putih ini masuk ke saluran udara, dan kemudian mampet di situ.

Di ujung silinder pompa ada katup searah. Katup ini sepintas simetris, namun nanti mesti dipasang lagi dengan arah yang benar sesuai dengan arah udaranya.

Bagian katup searah tempat masuk udara

Bagian katup searah tempat keluar udara. Ada ring karet hitam untuk perapat.

Pada tahap ini semua bagian yang sudah dibongkar dibersihkan satu per satu. Namun ketika sudah dibersihkan dan dipasang lagi , ternyata masih macet. Jadi terpaksa dilanjutkan ke tahap berikut, yaitu membongkar katup udara. Bagian ini dibongkar terakhir, karena sulit mencari petunjuk untuk membongkarnya.

Kenop plastik di kedua ujung dapat ditarik dengan mudah, tidak ada sekrup ataupun ulir penahan. Hanya dijepit saja.

Batang katup dapat dicopot dengan cara didorong dengan obeng kecil. Berikut ini batang katup dan kedua kenop di ujung katup. Batang katup tidak simetris, jadi ketika dirakit kembali mesti dipastikan sesuai dengan ketika dicopot.

Tahap berikutnya adalah membongkar bagian dalam katup. Dimulai dengan mencopot penahannya. Penahan ini ada ulirnya, dan hanya ada ada 2 lubang untuk memutarnya. Untuk memutar, mesti menggunakan tang bulat yang biasa dipakai untuk kerajinan. 

 

 Berikut ini penutup katup yang sudah dicopot.

Tahap selanjutnya susah dijelaskan. Intinya ada susunan cincin ring dari bahan plastik dan karet di dalam katup tersebut, dan semuanya mesti dikeluarkan. Untuk mengeluarkannya, dapat dicongkel dengan menggunakan paku yang dibengkokkan ujungnya. Paku yang saya pakai agak besar, jadi ujungnya setelah dibengkokkan masih perlu digerinda supaya bisa masuk ke dalamnya.

Tahap berikutnya adalah mencongkel ring karet dan ring plastik di dalamnya. Mesti hati-hati supaya karet dan plastik tersebut tidak rusak. Jika sudah selesai, maka akan didapat urutan ring sebagai berikut:

Berikut ini ring berdasarkan urutan dikeluarkan:

• ring karet hitam
• ting plastik putih agak tebal
• ring karet hitam
• ring karet hijau
• ring plastik tipis
• ring karet hijau
• ring karet hitam 

Berikut ini ring dipasang pada batang katup, untuk melihat seperti apa susunan ring di dalam katup tersebut:

Perhatikan ada 2 ring plastik yang berbeda ketebalannya. Juga ada 2 macam ring karet: yang hitam dan yang hijau.
Pada ring-ring ini saya jumpai terdapat residu berwarna putih-putih, kemungkinan sisa-sisa gemuk pelumas dari tabung pompa. Semua ring ini kemudian dibersihkan.

Pada tahap ini, tabung pompa dan pengukur tekanan saya pasang kembali, kemudian udara saya pompa. Setelah itu timbul suara ledakan keras, dan setelah itu saluran udara dari tabung pompa ke katup jadi bersih.

Kesimpulan: ada endapan di saluran udara dari pompa ke katup, dan untuk membersihkan endapan ini, katup mesti dibongkar, kemudian pompa diaktifkan untuk mendorong keluar endapan tersebut.

Tahap selanjutnya membersihkan semua bagian supaya tidak ada lagi residu putih tersebut.

Pada proses perakitan dijumpai masalah, yaitu pompa udara bocor. Pada beberapa video disarankan untuk menambahkan minyak goreng (cooking oil) ke semua katup dan ring, namun setelah hal ini dilakukan masih bocor. Kemudian khusus untuk katup di bagian pompa, saya tambahkan gemuk khusus yang food grade, baru kemudian dipasang kembali. Setelah itu baru handpresso pump ini dapat berfungsi normal.

Kebetulan saya masih ada sisa gemuk 'food grade' sisa dari mengganti gemuk di mixer Kitchen Aid

Food grade grease

Berikut ini diagram rekaan saya tentang isi dari Handpresso Pump tersebut:

Bahasa Indonesia: Dilarang Parkir Dibahu Jalan

Larangan parkir di bahu jalan.

Seharusnya ditulis ‘DILARANG PARKIR DI BAHU JALAN’.

Silsilah Walisongo

Banyak dari Wali Songo adalah keturunan dari Jamaluddin al-Hussein. Silsilah Jamaluddin al-Hussein bersambung sampai ke Rasulullah sebagai berikut:

• Jamaluddin al-Hussein (Sayyid Hussein Jamadil Kubra) ibni
• Ahmad Syah Jalal ibni
• Abdullah ibni
• Abdul Malik ibni
• Alawi Amal Al-Faqih ibni
• Muhammad Shahib Mirbath ibni
• Ali Khali’ Qasam ibni
• Alawi ibni
• Muhammad ibni
• Alawi ibni
• Ubaidillah ibni
• Ahmad Muhajirullah ibni
• Isa Al Rumi ibni
• Muhammad Naqib ibni
• Ali al-Uraidhi ibni
• Jaafar ash Sadiq ibni
• Muhammad al-Baqir ibni
• Ali Zainal Abidin ibni
• Al-Hussein ibni
• Sayyidatina Fatimah binti
• Rasulullah SAW

Silsilah Wali Songo keturunan beliau dapat dilihat pada gambar berikut:

Daftar Pustaka:

• (Tun) Suzana (Tun)Hj Othman, Hj. Mujaffar Dato Hj Mohamad, Ahlul Bait Rasulullah SAW dan Kesultanan Melayu, Crescent News, Selangor Darul Ehsan, 2006